1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2020 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/errno.h>
13 #include <linux/gfp.h>
15 #include <linux/if_arp.h>
16 #include <linux/if_ether.h>
17 #include <linux/kernel.h>
18 #include <linux/kref.h>
19 #include <linux/limits.h>
20 #include <linux/list.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"
35 #include "distributed-arp-table.h"
36 #include "gateway_client.h"
38 #include "originator.h"
40 #include "soft-interface.h"
42 #include "translation-table.h"
45 * batadv_hardif_release() - release hard interface from lists and queue for
46 * free after rcu grace period
47 * @ref: kref pointer of the hard interface
49 void batadv_hardif_release(struct kref *ref)
51 struct batadv_hard_iface *hard_iface;
53 hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
54 dev_put(hard_iface->net_dev);
56 kfree_rcu(hard_iface, rcu);
60 * batadv_hardif_get_by_netdev() - Get hard interface object of a net_device
61 * @net_dev: net_device to search for
63 * Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors
65 struct batadv_hard_iface *
66 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
68 struct batadv_hard_iface *hard_iface;
71 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
72 if (hard_iface->net_dev == net_dev &&
73 kref_get_unless_zero(&hard_iface->refcount))
85 * batadv_getlink_net() - return link net namespace (of use fallback)
86 * @netdev: net_device to check
87 * @fallback_net: return in case get_link_net is not available for @netdev
89 * Return: result of rtnl_link_ops->get_link_net or @fallback_net
91 static struct net *batadv_getlink_net(const struct net_device *netdev,
92 struct net *fallback_net)
94 if (!netdev->rtnl_link_ops)
97 if (!netdev->rtnl_link_ops->get_link_net)
100 return netdev->rtnl_link_ops->get_link_net(netdev);
104 * batadv_mutual_parents() - check if two devices are each others parent
106 * @net1: 1st devices netns
108 * @net2: 2nd devices netns
110 * veth devices come in pairs and each is the parent of the other!
112 * Return: true if the devices are each others parent, otherwise false
114 static bool batadv_mutual_parents(const struct net_device *dev1,
116 const struct net_device *dev2,
119 int dev1_parent_iflink = dev_get_iflink(dev1);
120 int dev2_parent_iflink = dev_get_iflink(dev2);
121 const struct net *dev1_parent_net;
122 const struct net *dev2_parent_net;
124 dev1_parent_net = batadv_getlink_net(dev1, net1);
125 dev2_parent_net = batadv_getlink_net(dev2, net2);
127 if (!dev1_parent_iflink || !dev2_parent_iflink)
130 return (dev1_parent_iflink == dev2->ifindex) &&
131 (dev2_parent_iflink == dev1->ifindex) &&
132 net_eq(dev1_parent_net, net2) &&
133 net_eq(dev2_parent_net, net1);
137 * batadv_is_on_batman_iface() - check if a device is a batman iface descendant
138 * @net_dev: the device to check
140 * If the user creates any virtual device on top of a batman-adv interface, it
141 * is important to prevent this new interface from being used to create a new
142 * mesh network (this behaviour would lead to a batman-over-batman
143 * configuration). This function recursively checks all the fathers of the
144 * device passed as argument looking for a batman-adv soft interface.
146 * Return: true if the device is descendant of a batman-adv mesh interface (or
147 * if it is a batman-adv interface itself), false otherwise
149 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
151 struct net *net = dev_net(net_dev);
152 struct net_device *parent_dev;
153 struct net *parent_net;
156 /* check if this is a batman-adv mesh interface */
157 if (batadv_softif_is_valid(net_dev))
160 /* no more parents..stop recursion */
161 if (dev_get_iflink(net_dev) == 0 ||
162 dev_get_iflink(net_dev) == net_dev->ifindex)
165 parent_net = batadv_getlink_net(net_dev, net);
167 /* recurse over the parent device */
168 parent_dev = __dev_get_by_index((struct net *)parent_net,
169 dev_get_iflink(net_dev));
170 /* if we got a NULL parent_dev there is something broken.. */
172 pr_err("Cannot find parent device\n");
176 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
179 ret = batadv_is_on_batman_iface(parent_dev);
184 static bool batadv_is_valid_iface(const struct net_device *net_dev)
186 if (net_dev->flags & IFF_LOOPBACK)
189 if (net_dev->type != ARPHRD_ETHER)
192 if (net_dev->addr_len != ETH_ALEN)
195 /* no batman over batman */
196 if (batadv_is_on_batman_iface(net_dev))
203 * batadv_get_real_netdevice() - check if the given netdev struct is a virtual
204 * interface on top of another 'real' interface
205 * @netdev: the device to check
207 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
210 * Return: the 'real' net device or the original net device and NULL in case
213 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
215 struct batadv_hard_iface *hard_iface = NULL;
216 struct net_device *real_netdev = NULL;
217 struct net *real_net;
226 if (netdev->ifindex == dev_get_iflink(netdev)) {
231 hard_iface = batadv_hardif_get_by_netdev(netdev);
232 if (!hard_iface || !hard_iface->soft_iface)
235 net = dev_net(hard_iface->soft_iface);
236 ifindex = dev_get_iflink(netdev);
237 real_net = batadv_getlink_net(netdev, net);
238 real_netdev = dev_get_by_index(real_net, ifindex);
242 batadv_hardif_put(hard_iface);
247 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
248 * interface on top of another 'real' interface
249 * @net_device: the device to check
251 * Return: the 'real' net device or the original net device and NULL in case
254 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
256 struct net_device *real_netdev;
259 real_netdev = batadv_get_real_netdevice(net_device);
266 * batadv_is_wext_netdev() - check if the given net_device struct is a
267 * wext wifi interface
268 * @net_device: the device to check
270 * Return: true if the net device is a wext wireless device, false
273 static bool batadv_is_wext_netdev(struct net_device *net_device)
278 #ifdef CONFIG_WIRELESS_EXT
279 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
280 * check for wireless_handlers != NULL
282 if (net_device->wireless_handlers)
290 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
291 * cfg80211 wifi interface
292 * @net_device: the device to check
294 * Return: true if the net device is a cfg80211 wireless device, false
297 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
302 /* cfg80211 drivers have to set ieee80211_ptr */
303 if (net_device->ieee80211_ptr)
310 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
311 * @net_device: the device to check
313 * Return: batadv_hard_iface_wifi_flags flags of the device
315 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
318 struct net_device *real_netdev;
320 if (batadv_is_wext_netdev(net_device))
321 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
323 if (batadv_is_cfg80211_netdev(net_device))
324 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
326 real_netdev = batadv_get_real_netdevice(net_device);
330 if (real_netdev == net_device)
333 if (batadv_is_wext_netdev(real_netdev))
334 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
336 if (batadv_is_cfg80211_netdev(real_netdev))
337 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
340 dev_put(real_netdev);
345 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
347 * @hard_iface: the device to check
349 * Return: true if the net device is a cfg80211 wireless device, false
352 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
354 u32 allowed_flags = 0;
356 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
357 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
359 return !!(hard_iface->wifi_flags & allowed_flags);
363 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
364 * @hard_iface: the device to check
366 * Return: true if the net device is a 802.11 wireless device, false otherwise.
368 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
373 return hard_iface->wifi_flags != 0;
377 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
378 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
379 * @orig_addr: the originator of this packet
380 * @orig_neigh: originator address of the forwarder we just got the packet from
381 * (NULL if we originated)
383 * Checks whether a packet needs to be (re)broadcasted on the given interface.
386 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
387 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
388 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
389 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
391 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
392 u8 *orig_addr, u8 *orig_neigh)
394 struct batadv_hardif_neigh_node *hardif_neigh;
395 struct hlist_node *first;
396 int ret = BATADV_HARDIF_BCAST_OK;
400 /* 0 neighbors -> no (re)broadcast */
401 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
403 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
407 /* >1 neighbors -> (re)brodcast */
408 if (rcu_dereference(hlist_next_rcu(first)))
411 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
414 /* 1 neighbor, is the originator -> no rebroadcast */
415 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
416 ret = BATADV_HARDIF_BCAST_DUPORIG;
417 /* 1 neighbor, is the one we received from -> no rebroadcast */
418 } else if (orig_neigh &&
419 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
420 ret = BATADV_HARDIF_BCAST_DUPFWD;
428 static struct batadv_hard_iface *
429 batadv_hardif_get_active(const struct net_device *soft_iface)
431 struct batadv_hard_iface *hard_iface;
434 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
435 if (hard_iface->soft_iface != soft_iface)
438 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
439 kref_get_unless_zero(&hard_iface->refcount))
450 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
451 struct batadv_hard_iface *oldif)
453 struct batadv_hard_iface *primary_if;
455 primary_if = batadv_primary_if_get_selected(bat_priv);
459 batadv_dat_init_own_addr(bat_priv, primary_if);
460 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
463 batadv_hardif_put(primary_if);
466 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
467 struct batadv_hard_iface *new_hard_iface)
469 struct batadv_hard_iface *curr_hard_iface;
474 kref_get(&new_hard_iface->refcount);
476 curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
482 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
483 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
487 batadv_hardif_put(curr_hard_iface);
491 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
493 if (hard_iface->net_dev->flags & IFF_UP)
499 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
501 const struct batadv_hard_iface *hard_iface;
504 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
505 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
506 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
509 if (hard_iface->net_dev == net_dev)
512 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
516 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
517 net_dev->dev_addr, hard_iface->net_dev->name);
518 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
524 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
525 * @soft_iface: netdev struct of the mesh interface
527 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
529 const struct batadv_hard_iface *hard_iface;
530 unsigned short lower_header_len = ETH_HLEN;
531 unsigned short lower_headroom = 0;
532 unsigned short lower_tailroom = 0;
533 unsigned short needed_headroom;
536 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
537 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
540 if (hard_iface->soft_iface != soft_iface)
543 lower_header_len = max_t(unsigned short, lower_header_len,
544 hard_iface->net_dev->hard_header_len);
546 lower_headroom = max_t(unsigned short, lower_headroom,
547 hard_iface->net_dev->needed_headroom);
549 lower_tailroom = max_t(unsigned short, lower_tailroom,
550 hard_iface->net_dev->needed_tailroom);
554 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
555 needed_headroom += batadv_max_header_len();
557 /* fragmentation headers don't strip the unicast/... header */
558 needed_headroom += sizeof(struct batadv_frag_packet);
560 soft_iface->needed_headroom = needed_headroom;
561 soft_iface->needed_tailroom = lower_tailroom;
565 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
566 * @soft_iface: netdev struct of the soft interface
568 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
571 int batadv_hardif_min_mtu(struct net_device *soft_iface)
573 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
574 const struct batadv_hard_iface *hard_iface;
575 int min_mtu = INT_MAX;
578 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
579 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
580 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
583 if (hard_iface->soft_iface != soft_iface)
586 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
590 if (atomic_read(&bat_priv->fragmentation) == 0)
593 /* with fragmentation enabled the maximum size of internally generated
594 * packets such as translation table exchanges or tvlv containers, etc
595 * has to be calculated
597 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
598 min_mtu -= sizeof(struct batadv_frag_packet);
599 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
602 /* report to the other components the maximum amount of bytes that
603 * batman-adv can send over the wire (without considering the payload
604 * overhead). For example, this value is used by TT to compute the
605 * maximum local table size
607 atomic_set(&bat_priv->packet_size_max, min_mtu);
609 /* the real soft-interface MTU is computed by removing the payload
610 * overhead from the maximum amount of bytes that was just computed.
612 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
614 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
618 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
620 * @soft_iface: netdev struct of the soft interface
622 void batadv_update_min_mtu(struct net_device *soft_iface)
624 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
626 /* Check if the local translate table should be cleaned up to match a
627 * new (and smaller) MTU.
629 batadv_tt_local_resize_to_mtu(soft_iface);
633 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
635 struct batadv_priv *bat_priv;
636 struct batadv_hard_iface *primary_if = NULL;
638 if (hard_iface->if_status != BATADV_IF_INACTIVE)
641 bat_priv = netdev_priv(hard_iface->soft_iface);
643 bat_priv->algo_ops->iface.update_mac(hard_iface);
644 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
646 /* the first active interface becomes our primary interface or
647 * the next active interface after the old primary interface was removed
649 primary_if = batadv_primary_if_get_selected(bat_priv);
651 batadv_primary_if_select(bat_priv, hard_iface);
653 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
654 hard_iface->net_dev->name);
656 batadv_update_min_mtu(hard_iface->soft_iface);
658 if (bat_priv->algo_ops->iface.activate)
659 bat_priv->algo_ops->iface.activate(hard_iface);
663 batadv_hardif_put(primary_if);
667 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
669 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
670 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
673 hard_iface->if_status = BATADV_IF_INACTIVE;
675 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
676 hard_iface->net_dev->name);
678 batadv_update_min_mtu(hard_iface->soft_iface);
682 * batadv_master_del_slave() - remove hard_iface from the current master iface
683 * @slave: the interface enslaved in another master
684 * @master: the master from which slave has to be removed
686 * Invoke ndo_del_slave on master passing slave as argument. In this way the
687 * slave is free'd and the master can correctly change its internal state.
689 * Return: 0 on success, a negative value representing the error otherwise
691 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
692 struct net_device *master)
700 if (master->netdev_ops->ndo_del_slave)
701 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
707 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
708 * @hard_iface: hard interface to add to soft interface
709 * @net: the applicable net namespace
710 * @iface_name: name of the soft interface
712 * Return: 0 on success or negative error number in case of failure
714 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
715 struct net *net, const char *iface_name)
717 struct batadv_priv *bat_priv;
718 struct net_device *soft_iface, *master;
719 __be16 ethertype = htons(ETH_P_BATMAN);
720 int max_header_len = batadv_max_header_len();
723 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
726 kref_get(&hard_iface->refcount);
728 soft_iface = dev_get_by_name(net, iface_name);
731 soft_iface = batadv_softif_create(net, iface_name);
738 /* dev_get_by_name() increases the reference counter for us */
739 dev_hold(soft_iface);
742 if (!batadv_softif_is_valid(soft_iface)) {
743 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
749 /* check if the interface is enslaved in another virtual one and
750 * in that case unlink it first
752 master = netdev_master_upper_dev_get(hard_iface->net_dev);
753 ret = batadv_master_del_slave(hard_iface, master);
757 hard_iface->soft_iface = soft_iface;
758 bat_priv = netdev_priv(hard_iface->soft_iface);
760 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
761 soft_iface, NULL, NULL, NULL);
765 ret = bat_priv->algo_ops->iface.enable(hard_iface);
769 hard_iface->if_status = BATADV_IF_INACTIVE;
771 kref_get(&hard_iface->refcount);
772 hard_iface->batman_adv_ptype.type = ethertype;
773 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
774 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
775 dev_add_pack(&hard_iface->batman_adv_ptype);
777 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
778 hard_iface->net_dev->name);
780 if (atomic_read(&bat_priv->fragmentation) &&
781 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
782 batadv_info(hard_iface->soft_iface,
783 "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",
784 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
785 ETH_DATA_LEN + max_header_len);
787 if (!atomic_read(&bat_priv->fragmentation) &&
788 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
789 batadv_info(hard_iface->soft_iface,
790 "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",
791 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
792 ETH_DATA_LEN + max_header_len);
794 if (batadv_hardif_is_iface_up(hard_iface))
795 batadv_hardif_activate_interface(hard_iface);
797 batadv_err(hard_iface->soft_iface,
798 "Not using interface %s (retrying later): interface not active\n",
799 hard_iface->net_dev->name);
801 batadv_hardif_recalc_extra_skbroom(soft_iface);
803 if (bat_priv->algo_ops->iface.enabled)
804 bat_priv->algo_ops->iface.enabled(hard_iface);
810 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
812 hard_iface->soft_iface = NULL;
815 batadv_hardif_put(hard_iface);
820 * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
821 * @soft_iface: soft interface to check
823 * This function is only using RCU for locking - the result can therefore be
824 * off when another function is modifying the list at the same time. The
825 * caller can use the rtnl_lock to make sure that the count is accurate.
827 * Return: number of connected/enslaved hard interfaces
829 static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
831 struct batadv_hard_iface *hard_iface;
835 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
836 if (hard_iface->soft_iface != soft_iface)
847 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
848 * @hard_iface: hard interface to be removed
849 * @autodel: whether to delete soft interface when it doesn't contain any other
852 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
853 enum batadv_hard_if_cleanup autodel)
855 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
856 struct batadv_hard_iface *primary_if = NULL;
858 batadv_hardif_deactivate_interface(hard_iface);
860 if (hard_iface->if_status != BATADV_IF_INACTIVE)
863 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
864 hard_iface->net_dev->name);
865 dev_remove_pack(&hard_iface->batman_adv_ptype);
866 batadv_hardif_put(hard_iface);
868 primary_if = batadv_primary_if_get_selected(bat_priv);
869 if (hard_iface == primary_if) {
870 struct batadv_hard_iface *new_if;
872 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
873 batadv_primary_if_select(bat_priv, new_if);
876 batadv_hardif_put(new_if);
879 bat_priv->algo_ops->iface.disable(hard_iface);
880 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
882 /* delete all references to this hard_iface */
883 batadv_purge_orig_ref(bat_priv);
884 batadv_purge_outstanding_packets(bat_priv, hard_iface);
885 dev_put(hard_iface->soft_iface);
887 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
888 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
890 /* nobody uses this interface anymore */
891 if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1) {
892 batadv_gw_check_client_stop(bat_priv);
894 if (autodel == BATADV_IF_CLEANUP_AUTO)
895 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
898 hard_iface->soft_iface = NULL;
899 batadv_hardif_put(hard_iface);
903 batadv_hardif_put(primary_if);
906 static struct batadv_hard_iface *
907 batadv_hardif_add_interface(struct net_device *net_dev)
909 struct batadv_hard_iface *hard_iface;
914 if (!batadv_is_valid_iface(net_dev))
919 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
923 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
927 hard_iface->net_dev = net_dev;
928 hard_iface->soft_iface = NULL;
929 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
931 batadv_debugfs_add_hardif(hard_iface);
933 INIT_LIST_HEAD(&hard_iface->list);
934 INIT_HLIST_HEAD(&hard_iface->neigh_list);
936 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
937 spin_lock_init(&hard_iface->neigh_list_lock);
938 kref_init(&hard_iface->refcount);
940 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
941 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
942 if (batadv_is_wifi_hardif(hard_iface))
943 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
945 atomic_set(&hard_iface->hop_penalty, 0);
947 batadv_v_hardif_init(hard_iface);
949 batadv_check_known_mac_addr(hard_iface->net_dev);
950 kref_get(&hard_iface->refcount);
951 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
952 batadv_hardif_generation++;
964 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
968 /* first deactivate interface */
969 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
970 batadv_hardif_disable_interface(hard_iface,
971 BATADV_IF_CLEANUP_KEEP);
973 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
976 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
977 batadv_debugfs_del_hardif(hard_iface);
978 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
979 batadv_hardif_put(hard_iface);
983 * batadv_hard_if_event_softif() - Handle events for soft interfaces
984 * @event: NETDEV_* event to handle
985 * @net_dev: net_device which generated an event
987 * Return: NOTIFY_* result
989 static int batadv_hard_if_event_softif(unsigned long event,
990 struct net_device *net_dev)
992 struct batadv_priv *bat_priv;
995 case NETDEV_REGISTER:
996 batadv_sysfs_add_meshif(net_dev);
997 bat_priv = netdev_priv(net_dev);
998 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
1000 case NETDEV_CHANGENAME:
1001 batadv_debugfs_rename_meshif(net_dev);
1008 static int batadv_hard_if_event(struct notifier_block *this,
1009 unsigned long event, void *ptr)
1011 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
1012 struct batadv_hard_iface *hard_iface;
1013 struct batadv_hard_iface *primary_if = NULL;
1014 struct batadv_priv *bat_priv;
1016 if (batadv_softif_is_valid(net_dev))
1017 return batadv_hard_if_event_softif(event, net_dev);
1019 hard_iface = batadv_hardif_get_by_netdev(net_dev);
1020 if (!hard_iface && (event == NETDEV_REGISTER ||
1021 event == NETDEV_POST_TYPE_CHANGE))
1022 hard_iface = batadv_hardif_add_interface(net_dev);
1029 batadv_hardif_activate_interface(hard_iface);
1031 case NETDEV_GOING_DOWN:
1033 batadv_hardif_deactivate_interface(hard_iface);
1035 case NETDEV_UNREGISTER:
1036 case NETDEV_PRE_TYPE_CHANGE:
1037 list_del_rcu(&hard_iface->list);
1038 batadv_hardif_generation++;
1040 batadv_hardif_remove_interface(hard_iface);
1042 case NETDEV_CHANGEMTU:
1043 if (hard_iface->soft_iface)
1044 batadv_update_min_mtu(hard_iface->soft_iface);
1046 case NETDEV_CHANGEADDR:
1047 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
1050 batadv_check_known_mac_addr(hard_iface->net_dev);
1052 bat_priv = netdev_priv(hard_iface->soft_iface);
1053 bat_priv->algo_ops->iface.update_mac(hard_iface);
1055 primary_if = batadv_primary_if_get_selected(bat_priv);
1059 if (hard_iface == primary_if)
1060 batadv_primary_if_update_addr(bat_priv, NULL);
1062 case NETDEV_CHANGEUPPER:
1063 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1064 if (batadv_is_wifi_hardif(hard_iface))
1065 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1067 case NETDEV_CHANGENAME:
1068 batadv_debugfs_rename_hardif(hard_iface);
1075 batadv_hardif_put(hard_iface);
1078 batadv_hardif_put(primary_if);
1082 struct notifier_block batadv_hard_if_notifier = {
1083 .notifier_call = batadv_hard_if_event,