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/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/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;
155 /* check if this is a batman-adv mesh interface */
156 if (batadv_softif_is_valid(net_dev))
159 /* no more parents..stop recursion */
160 if (dev_get_iflink(net_dev) == 0 ||
161 dev_get_iflink(net_dev) == net_dev->ifindex)
164 parent_net = batadv_getlink_net(net_dev, net);
166 /* recurse over the parent device */
167 parent_dev = __dev_get_by_index((struct net *)parent_net,
168 dev_get_iflink(net_dev));
169 /* if we got a NULL parent_dev there is something broken.. */
171 pr_err("Cannot find parent device\n");
175 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
178 ret = batadv_is_on_batman_iface(parent_dev);
183 static bool batadv_is_valid_iface(const struct net_device *net_dev)
185 if (net_dev->flags & IFF_LOOPBACK)
188 if (net_dev->type != ARPHRD_ETHER)
191 if (net_dev->addr_len != ETH_ALEN)
194 /* no batman over batman */
195 if (batadv_is_on_batman_iface(net_dev))
202 * batadv_get_real_netdevice() - check if the given netdev struct is a virtual
203 * interface on top of another 'real' interface
204 * @netdev: the device to check
206 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
209 * Return: the 'real' net device or the original net device and NULL in case
212 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
214 struct batadv_hard_iface *hard_iface = NULL;
215 struct net_device *real_netdev = NULL;
216 struct net *real_net;
225 if (netdev->ifindex == dev_get_iflink(netdev)) {
230 hard_iface = batadv_hardif_get_by_netdev(netdev);
231 if (!hard_iface || !hard_iface->soft_iface)
234 net = dev_net(hard_iface->soft_iface);
235 ifindex = dev_get_iflink(netdev);
236 real_net = batadv_getlink_net(netdev, net);
237 real_netdev = dev_get_by_index(real_net, ifindex);
241 batadv_hardif_put(hard_iface);
246 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
247 * interface on top of another 'real' interface
248 * @net_device: the device to check
250 * Return: the 'real' net device or the original net device and NULL in case
253 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
255 struct net_device *real_netdev;
258 real_netdev = batadv_get_real_netdevice(net_device);
265 * batadv_is_wext_netdev() - check if the given net_device struct is a
266 * wext wifi interface
267 * @net_device: the device to check
269 * Return: true if the net device is a wext wireless device, false
272 static bool batadv_is_wext_netdev(struct net_device *net_device)
277 #ifdef CONFIG_WIRELESS_EXT
278 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
279 * check for wireless_handlers != NULL
281 if (net_device->wireless_handlers)
289 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
290 * cfg80211 wifi interface
291 * @net_device: the device to check
293 * Return: true if the net device is a cfg80211 wireless device, false
296 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
301 /* cfg80211 drivers have to set ieee80211_ptr */
302 if (net_device->ieee80211_ptr)
309 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
310 * @net_device: the device to check
312 * Return: batadv_hard_iface_wifi_flags flags of the device
314 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
317 struct net_device *real_netdev;
319 if (batadv_is_wext_netdev(net_device))
320 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
322 if (batadv_is_cfg80211_netdev(net_device))
323 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
325 real_netdev = batadv_get_real_netdevice(net_device);
329 if (real_netdev == net_device)
332 if (batadv_is_wext_netdev(real_netdev))
333 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
335 if (batadv_is_cfg80211_netdev(real_netdev))
336 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
339 dev_put(real_netdev);
344 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
346 * @hard_iface: the device to check
348 * Return: true if the net device is a cfg80211 wireless device, false
351 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
353 u32 allowed_flags = 0;
355 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
356 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
358 return !!(hard_iface->wifi_flags & allowed_flags);
362 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
363 * @hard_iface: the device to check
365 * Return: true if the net device is a 802.11 wireless device, false otherwise.
367 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
372 return hard_iface->wifi_flags != 0;
376 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
377 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
378 * @orig_addr: the originator of this packet
379 * @orig_neigh: originator address of the forwarder we just got the packet from
380 * (NULL if we originated)
382 * Checks whether a packet needs to be (re)broadcasted on the given interface.
385 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
386 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
387 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
388 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
390 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
391 u8 *orig_addr, u8 *orig_neigh)
393 struct batadv_hardif_neigh_node *hardif_neigh;
394 struct hlist_node *first;
395 int ret = BATADV_HARDIF_BCAST_OK;
399 /* 0 neighbors -> no (re)broadcast */
400 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
402 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
406 /* >1 neighbors -> (re)brodcast */
407 if (rcu_dereference(hlist_next_rcu(first)))
410 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
413 /* 1 neighbor, is the originator -> no rebroadcast */
414 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
415 ret = BATADV_HARDIF_BCAST_DUPORIG;
416 /* 1 neighbor, is the one we received from -> no rebroadcast */
417 } else if (orig_neigh &&
418 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
419 ret = BATADV_HARDIF_BCAST_DUPFWD;
427 static struct batadv_hard_iface *
428 batadv_hardif_get_active(const struct net_device *soft_iface)
430 struct batadv_hard_iface *hard_iface;
433 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
434 if (hard_iface->soft_iface != soft_iface)
437 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
438 kref_get_unless_zero(&hard_iface->refcount))
449 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
450 struct batadv_hard_iface *oldif)
452 struct batadv_hard_iface *primary_if;
454 primary_if = batadv_primary_if_get_selected(bat_priv);
458 batadv_dat_init_own_addr(bat_priv, primary_if);
459 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
462 batadv_hardif_put(primary_if);
465 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
466 struct batadv_hard_iface *new_hard_iface)
468 struct batadv_hard_iface *curr_hard_iface;
473 kref_get(&new_hard_iface->refcount);
475 curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
481 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
482 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
486 batadv_hardif_put(curr_hard_iface);
490 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
492 if (hard_iface->net_dev->flags & IFF_UP)
498 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
500 const struct batadv_hard_iface *hard_iface;
503 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
504 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
505 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
508 if (hard_iface->net_dev == net_dev)
511 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
515 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
516 net_dev->dev_addr, hard_iface->net_dev->name);
517 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
523 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
524 * @soft_iface: netdev struct of the mesh interface
526 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
528 const struct batadv_hard_iface *hard_iface;
529 unsigned short lower_header_len = ETH_HLEN;
530 unsigned short lower_headroom = 0;
531 unsigned short lower_tailroom = 0;
532 unsigned short needed_headroom;
535 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
536 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
539 if (hard_iface->soft_iface != soft_iface)
542 lower_header_len = max_t(unsigned short, lower_header_len,
543 hard_iface->net_dev->hard_header_len);
545 lower_headroom = max_t(unsigned short, lower_headroom,
546 hard_iface->net_dev->needed_headroom);
548 lower_tailroom = max_t(unsigned short, lower_tailroom,
549 hard_iface->net_dev->needed_tailroom);
553 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
554 needed_headroom += batadv_max_header_len();
556 /* fragmentation headers don't strip the unicast/... header */
557 needed_headroom += sizeof(struct batadv_frag_packet);
559 soft_iface->needed_headroom = needed_headroom;
560 soft_iface->needed_tailroom = lower_tailroom;
564 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
565 * @soft_iface: netdev struct of the soft interface
567 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
570 int batadv_hardif_min_mtu(struct net_device *soft_iface)
572 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
573 const struct batadv_hard_iface *hard_iface;
574 int min_mtu = INT_MAX;
577 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
578 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
579 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
582 if (hard_iface->soft_iface != soft_iface)
585 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
589 if (atomic_read(&bat_priv->fragmentation) == 0)
592 /* with fragmentation enabled the maximum size of internally generated
593 * packets such as translation table exchanges or tvlv containers, etc
594 * has to be calculated
596 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
597 min_mtu -= sizeof(struct batadv_frag_packet);
598 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
601 /* report to the other components the maximum amount of bytes that
602 * batman-adv can send over the wire (without considering the payload
603 * overhead). For example, this value is used by TT to compute the
604 * maximum local table size
606 atomic_set(&bat_priv->packet_size_max, min_mtu);
608 /* the real soft-interface MTU is computed by removing the payload
609 * overhead from the maximum amount of bytes that was just computed.
611 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
613 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
617 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
619 * @soft_iface: netdev struct of the soft interface
621 void batadv_update_min_mtu(struct net_device *soft_iface)
623 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
625 /* Check if the local translate table should be cleaned up to match a
626 * new (and smaller) MTU.
628 batadv_tt_local_resize_to_mtu(soft_iface);
632 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
634 struct batadv_priv *bat_priv;
635 struct batadv_hard_iface *primary_if = NULL;
637 if (hard_iface->if_status != BATADV_IF_INACTIVE)
640 bat_priv = netdev_priv(hard_iface->soft_iface);
642 bat_priv->algo_ops->iface.update_mac(hard_iface);
643 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
645 /* the first active interface becomes our primary interface or
646 * the next active interface after the old primary interface was removed
648 primary_if = batadv_primary_if_get_selected(bat_priv);
650 batadv_primary_if_select(bat_priv, hard_iface);
652 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
653 hard_iface->net_dev->name);
655 batadv_update_min_mtu(hard_iface->soft_iface);
657 if (bat_priv->algo_ops->iface.activate)
658 bat_priv->algo_ops->iface.activate(hard_iface);
662 batadv_hardif_put(primary_if);
666 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
668 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
669 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
672 hard_iface->if_status = BATADV_IF_INACTIVE;
674 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
675 hard_iface->net_dev->name);
677 batadv_update_min_mtu(hard_iface->soft_iface);
681 * batadv_master_del_slave() - remove hard_iface from the current master iface
682 * @slave: the interface enslaved in another master
683 * @master: the master from which slave has to be removed
685 * Invoke ndo_del_slave on master passing slave as argument. In this way the
686 * slave is free'd and the master can correctly change its internal state.
688 * Return: 0 on success, a negative value representing the error otherwise
690 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
691 struct net_device *master)
699 if (master->netdev_ops->ndo_del_slave)
700 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
706 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
707 * @hard_iface: hard interface to add to soft interface
708 * @net: the applicable net namespace
709 * @iface_name: name of the soft interface
711 * Return: 0 on success or negative error number in case of failure
713 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
714 struct net *net, const char *iface_name)
716 struct batadv_priv *bat_priv;
717 struct net_device *soft_iface, *master;
718 __be16 ethertype = htons(ETH_P_BATMAN);
719 int max_header_len = batadv_max_header_len();
722 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
725 kref_get(&hard_iface->refcount);
727 soft_iface = dev_get_by_name(net, iface_name);
730 soft_iface = batadv_softif_create(net, iface_name);
737 /* dev_get_by_name() increases the reference counter for us */
738 dev_hold(soft_iface);
741 if (!batadv_softif_is_valid(soft_iface)) {
742 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
748 /* check if the interface is enslaved in another virtual one and
749 * in that case unlink it first
751 master = netdev_master_upper_dev_get(hard_iface->net_dev);
752 ret = batadv_master_del_slave(hard_iface, master);
756 hard_iface->soft_iface = soft_iface;
757 bat_priv = netdev_priv(hard_iface->soft_iface);
759 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
760 soft_iface, NULL, NULL, NULL);
764 ret = bat_priv->algo_ops->iface.enable(hard_iface);
768 hard_iface->if_status = BATADV_IF_INACTIVE;
770 kref_get(&hard_iface->refcount);
771 hard_iface->batman_adv_ptype.type = ethertype;
772 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
773 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
774 dev_add_pack(&hard_iface->batman_adv_ptype);
776 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
777 hard_iface->net_dev->name);
779 if (atomic_read(&bat_priv->fragmentation) &&
780 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
781 batadv_info(hard_iface->soft_iface,
782 "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",
783 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
784 ETH_DATA_LEN + max_header_len);
786 if (!atomic_read(&bat_priv->fragmentation) &&
787 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
788 batadv_info(hard_iface->soft_iface,
789 "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",
790 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
791 ETH_DATA_LEN + max_header_len);
793 if (batadv_hardif_is_iface_up(hard_iface))
794 batadv_hardif_activate_interface(hard_iface);
796 batadv_err(hard_iface->soft_iface,
797 "Not using interface %s (retrying later): interface not active\n",
798 hard_iface->net_dev->name);
800 batadv_hardif_recalc_extra_skbroom(soft_iface);
802 if (bat_priv->algo_ops->iface.enabled)
803 bat_priv->algo_ops->iface.enabled(hard_iface);
809 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
811 hard_iface->soft_iface = NULL;
814 batadv_hardif_put(hard_iface);
819 * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
820 * @soft_iface: soft interface to check
822 * This function is only using RCU for locking - the result can therefore be
823 * off when another function is modifying the list at the same time. The
824 * caller can use the rtnl_lock to make sure that the count is accurate.
826 * Return: number of connected/enslaved hard interfaces
828 static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
830 struct batadv_hard_iface *hard_iface;
834 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
835 if (hard_iface->soft_iface != soft_iface)
846 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
847 * @hard_iface: hard interface to be removed
849 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
851 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
852 struct batadv_hard_iface *primary_if = NULL;
854 batadv_hardif_deactivate_interface(hard_iface);
856 if (hard_iface->if_status != BATADV_IF_INACTIVE)
859 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
860 hard_iface->net_dev->name);
861 dev_remove_pack(&hard_iface->batman_adv_ptype);
862 batadv_hardif_put(hard_iface);
864 primary_if = batadv_primary_if_get_selected(bat_priv);
865 if (hard_iface == primary_if) {
866 struct batadv_hard_iface *new_if;
868 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
869 batadv_primary_if_select(bat_priv, new_if);
872 batadv_hardif_put(new_if);
875 bat_priv->algo_ops->iface.disable(hard_iface);
876 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
878 /* delete all references to this hard_iface */
879 batadv_purge_orig_ref(bat_priv);
880 batadv_purge_outstanding_packets(bat_priv, hard_iface);
881 dev_put(hard_iface->soft_iface);
883 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
884 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
886 /* nobody uses this interface anymore */
887 if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1)
888 batadv_gw_check_client_stop(bat_priv);
890 hard_iface->soft_iface = NULL;
891 batadv_hardif_put(hard_iface);
895 batadv_hardif_put(primary_if);
898 static struct batadv_hard_iface *
899 batadv_hardif_add_interface(struct net_device *net_dev)
901 struct batadv_hard_iface *hard_iface;
905 if (!batadv_is_valid_iface(net_dev))
910 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
914 hard_iface->net_dev = net_dev;
915 hard_iface->soft_iface = NULL;
916 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
918 INIT_LIST_HEAD(&hard_iface->list);
919 INIT_HLIST_HEAD(&hard_iface->neigh_list);
921 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
922 spin_lock_init(&hard_iface->neigh_list_lock);
923 kref_init(&hard_iface->refcount);
925 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
926 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
927 if (batadv_is_wifi_hardif(hard_iface))
928 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
930 atomic_set(&hard_iface->hop_penalty, 0);
932 batadv_v_hardif_init(hard_iface);
934 batadv_check_known_mac_addr(hard_iface->net_dev);
935 kref_get(&hard_iface->refcount);
936 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
937 batadv_hardif_generation++;
947 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
951 /* first deactivate interface */
952 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
953 batadv_hardif_disable_interface(hard_iface);
955 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
958 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
959 batadv_hardif_put(hard_iface);
963 * batadv_hard_if_event_softif() - Handle events for soft interfaces
964 * @event: NETDEV_* event to handle
965 * @net_dev: net_device which generated an event
967 * Return: NOTIFY_* result
969 static int batadv_hard_if_event_softif(unsigned long event,
970 struct net_device *net_dev)
972 struct batadv_priv *bat_priv;
975 case NETDEV_REGISTER:
976 bat_priv = netdev_priv(net_dev);
977 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
984 static int batadv_hard_if_event(struct notifier_block *this,
985 unsigned long event, void *ptr)
987 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
988 struct batadv_hard_iface *hard_iface;
989 struct batadv_hard_iface *primary_if = NULL;
990 struct batadv_priv *bat_priv;
992 if (batadv_softif_is_valid(net_dev))
993 return batadv_hard_if_event_softif(event, net_dev);
995 hard_iface = batadv_hardif_get_by_netdev(net_dev);
996 if (!hard_iface && (event == NETDEV_REGISTER ||
997 event == NETDEV_POST_TYPE_CHANGE))
998 hard_iface = batadv_hardif_add_interface(net_dev);
1005 batadv_hardif_activate_interface(hard_iface);
1007 case NETDEV_GOING_DOWN:
1009 batadv_hardif_deactivate_interface(hard_iface);
1011 case NETDEV_UNREGISTER:
1012 case NETDEV_PRE_TYPE_CHANGE:
1013 list_del_rcu(&hard_iface->list);
1014 batadv_hardif_generation++;
1016 batadv_hardif_remove_interface(hard_iface);
1018 case NETDEV_CHANGEMTU:
1019 if (hard_iface->soft_iface)
1020 batadv_update_min_mtu(hard_iface->soft_iface);
1022 case NETDEV_CHANGEADDR:
1023 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
1026 batadv_check_known_mac_addr(hard_iface->net_dev);
1028 bat_priv = netdev_priv(hard_iface->soft_iface);
1029 bat_priv->algo_ops->iface.update_mac(hard_iface);
1031 primary_if = batadv_primary_if_get_selected(bat_priv);
1035 if (hard_iface == primary_if)
1036 batadv_primary_if_update_addr(bat_priv, NULL);
1038 case NETDEV_CHANGEUPPER:
1039 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1040 if (batadv_is_wifi_hardif(hard_iface))
1041 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1048 batadv_hardif_put(hard_iface);
1051 batadv_hardif_put(primary_if);
1055 struct notifier_block batadv_hard_if_notifier = {
1056 .notifier_call = batadv_hard_if_event,