1 /* Copyright (C) 2007-2017 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include "hard-interface.h"
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/errno.h>
26 #include <linux/if_arp.h>
27 #include <linux/if_ether.h>
28 #include <linux/kernel.h>
29 #include <linux/kref.h>
30 #include <linux/list.h>
31 #include <linux/mutex.h>
32 #include <linux/netdevice.h>
33 #include <linux/printk.h>
34 #include <linux/rculist.h>
35 #include <linux/rtnetlink.h>
36 #include <linux/slab.h>
37 #include <linux/spinlock.h>
38 #include <net/net_namespace.h>
39 #include <net/rtnetlink.h>
42 #include "bridge_loop_avoidance.h"
44 #include "distributed-arp-table.h"
45 #include "gateway_client.h"
47 #include "originator.h"
50 #include "soft-interface.h"
52 #include "translation-table.h"
55 * batadv_hardif_release - release hard interface from lists and queue for
56 * free after rcu grace period
57 * @ref: kref pointer of the hard interface
59 void batadv_hardif_release(struct kref *ref)
61 struct batadv_hard_iface *hard_iface;
63 hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
64 dev_put(hard_iface->net_dev);
66 kfree_rcu(hard_iface, rcu);
69 struct batadv_hard_iface *
70 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
72 struct batadv_hard_iface *hard_iface;
75 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
76 if (hard_iface->net_dev == net_dev &&
77 kref_get_unless_zero(&hard_iface->refcount))
89 * batadv_getlink_net - return link net namespace (of use fallback)
90 * @netdev: net_device to check
91 * @fallback_net: return in case get_link_net is not available for @netdev
93 * Return: result of rtnl_link_ops->get_link_net or @fallback_net
95 static struct net *batadv_getlink_net(const struct net_device *netdev,
96 struct net *fallback_net)
98 if (!netdev->rtnl_link_ops)
101 if (!netdev->rtnl_link_ops->get_link_net)
104 return netdev->rtnl_link_ops->get_link_net(netdev);
108 * batadv_mutual_parents - check if two devices are each others parent
110 * @net1: 1st devices netns
112 * @net2: 2nd devices netns
114 * veth devices come in pairs and each is the parent of the other!
116 * Return: true if the devices are each others parent, otherwise false
118 static bool batadv_mutual_parents(const struct net_device *dev1,
120 const struct net_device *dev2,
123 int dev1_parent_iflink = dev_get_iflink(dev1);
124 int dev2_parent_iflink = dev_get_iflink(dev2);
125 const struct net *dev1_parent_net;
126 const struct net *dev2_parent_net;
128 dev1_parent_net = batadv_getlink_net(dev1, net1);
129 dev2_parent_net = batadv_getlink_net(dev2, net2);
131 if (!dev1_parent_iflink || !dev2_parent_iflink)
134 return (dev1_parent_iflink == dev2->ifindex) &&
135 (dev2_parent_iflink == dev1->ifindex) &&
136 net_eq(dev1_parent_net, net2) &&
137 net_eq(dev2_parent_net, net1);
141 * batadv_is_on_batman_iface - check if a device is a batman iface descendant
142 * @net_dev: the device to check
144 * If the user creates any virtual device on top of a batman-adv interface, it
145 * is important to prevent this new interface to be used to create a new mesh
146 * network (this behaviour would lead to a batman-over-batman configuration).
147 * This function recursively checks all the fathers of the device passed as
148 * argument looking for a batman-adv soft interface.
150 * Return: true if the device is descendant of a batman-adv mesh interface (or
151 * if it is a batman-adv interface itself), false otherwise
153 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
155 struct net *net = dev_net(net_dev);
156 struct net_device *parent_dev;
157 struct net *parent_net;
161 /* check if this is a batman-adv mesh interface */
162 if (batadv_softif_is_valid(net_dev))
165 iflink = dev_get_iflink(net_dev);
169 parent_net = batadv_getlink_net(net_dev, net);
171 /* iflink to itself, most likely physical device */
172 if (net == parent_net && iflink == net_dev->ifindex)
175 /* recurse over the parent device */
176 parent_dev = __dev_get_by_index((struct net *)parent_net, iflink);
177 /* if we got a NULL parent_dev there is something broken.. */
179 pr_err("Cannot find parent device\n");
183 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
186 ret = batadv_is_on_batman_iface(parent_dev);
191 static bool batadv_is_valid_iface(const struct net_device *net_dev)
193 if (net_dev->flags & IFF_LOOPBACK)
196 if (net_dev->type != ARPHRD_ETHER)
199 if (net_dev->addr_len != ETH_ALEN)
202 /* no batman over batman */
203 if (batadv_is_on_batman_iface(net_dev))
210 * batadv_get_real_netdevice - check if the given netdev struct is a virtual
211 * interface on top of another 'real' interface
212 * @netdev: the device to check
214 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
217 * Return: the 'real' net device or the original net device and NULL in case
220 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
222 struct batadv_hard_iface *hard_iface = NULL;
223 struct net_device *real_netdev = NULL;
224 struct net *real_net;
233 iflink = dev_get_iflink(netdev);
239 hard_iface = batadv_hardif_get_by_netdev(netdev);
240 if (!hard_iface || !hard_iface->soft_iface)
243 net = dev_net(hard_iface->soft_iface);
244 real_net = batadv_getlink_net(netdev, net);
246 /* iflink to itself, most likely physical device */
247 if (net == real_net && netdev->ifindex == iflink) {
248 real_netdev = netdev;
249 dev_hold(real_netdev);
253 real_netdev = dev_get_by_index(real_net, iflink);
257 batadv_hardif_put(hard_iface);
262 * batadv_get_real_netdev - check if the given net_device struct is a virtual
263 * interface on top of another 'real' interface
264 * @net_device: the device to check
266 * Return: the 'real' net device or the original net device and NULL in case
269 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
271 struct net_device *real_netdev;
274 real_netdev = batadv_get_real_netdevice(net_device);
281 * batadv_is_wext_netdev - check if the given net_device struct is a
282 * wext wifi interface
283 * @net_device: the device to check
285 * Return: true if the net device is a wext wireless device, false
288 static bool batadv_is_wext_netdev(struct net_device *net_device)
293 #ifdef CONFIG_WIRELESS_EXT
294 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
295 * check for wireless_handlers != NULL
297 if (net_device->wireless_handlers)
305 * batadv_is_cfg80211_netdev - check if the given net_device struct is a
306 * cfg80211 wifi interface
307 * @net_device: the device to check
309 * Return: true if the net device is a cfg80211 wireless device, false
312 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
317 /* cfg80211 drivers have to set ieee80211_ptr */
318 if (net_device->ieee80211_ptr)
325 * batadv_wifi_flags_evaluate - calculate wifi flags for net_device
326 * @net_device: the device to check
328 * Return: batadv_hard_iface_wifi_flags flags of the device
330 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
333 struct net_device *real_netdev;
335 if (batadv_is_wext_netdev(net_device))
336 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
338 if (batadv_is_cfg80211_netdev(net_device))
339 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
341 real_netdev = batadv_get_real_netdevice(net_device);
345 if (real_netdev == net_device)
348 if (batadv_is_wext_netdev(real_netdev))
349 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
351 if (batadv_is_cfg80211_netdev(real_netdev))
352 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
355 dev_put(real_netdev);
360 * batadv_is_cfg80211_hardif - check if the given hardif is a cfg80211 wifi
362 * @hard_iface: the device to check
364 * Return: true if the net device is a cfg80211 wireless device, false
367 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
369 u32 allowed_flags = 0;
371 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
372 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
374 return !!(hard_iface->wifi_flags & allowed_flags);
378 * batadv_is_wifi_hardif - check if the given hardif is a wifi interface
379 * @hard_iface: the device to check
381 * Return: true if the net device is a 802.11 wireless device, false otherwise.
383 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
388 return hard_iface->wifi_flags != 0;
392 * batadv_hardif_no_broadcast - check whether (re)broadcast is necessary
393 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
394 * @orig_addr: the originator of this packet
395 * @orig_neigh: originator address of the forwarder we just got the packet from
396 * (NULL if we originated)
398 * Checks whether a packet needs to be (re)broadcasted on the given interface.
401 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
402 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
403 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
404 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
406 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
407 u8 *orig_addr, u8 *orig_neigh)
409 struct batadv_hardif_neigh_node *hardif_neigh;
410 struct hlist_node *first;
411 int ret = BATADV_HARDIF_BCAST_OK;
415 /* 0 neighbors -> no (re)broadcast */
416 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
418 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
422 /* >1 neighbors -> (re)brodcast */
423 if (rcu_dereference(hlist_next_rcu(first)))
426 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
429 /* 1 neighbor, is the originator -> no rebroadcast */
430 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
431 ret = BATADV_HARDIF_BCAST_DUPORIG;
432 /* 1 neighbor, is the one we received from -> no rebroadcast */
433 } else if (orig_neigh &&
434 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
435 ret = BATADV_HARDIF_BCAST_DUPFWD;
443 static struct batadv_hard_iface *
444 batadv_hardif_get_active(const struct net_device *soft_iface)
446 struct batadv_hard_iface *hard_iface;
449 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
450 if (hard_iface->soft_iface != soft_iface)
453 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
454 kref_get_unless_zero(&hard_iface->refcount))
465 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
466 struct batadv_hard_iface *oldif)
468 struct batadv_hard_iface *primary_if;
470 primary_if = batadv_primary_if_get_selected(bat_priv);
474 batadv_dat_init_own_addr(bat_priv, primary_if);
475 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
478 batadv_hardif_put(primary_if);
481 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
482 struct batadv_hard_iface *new_hard_iface)
484 struct batadv_hard_iface *curr_hard_iface;
489 kref_get(&new_hard_iface->refcount);
491 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
492 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
497 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
498 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
502 batadv_hardif_put(curr_hard_iface);
506 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
508 if (hard_iface->net_dev->flags & IFF_UP)
514 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
516 const struct batadv_hard_iface *hard_iface;
519 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
520 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
521 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
524 if (hard_iface->net_dev == net_dev)
527 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
531 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
532 net_dev->dev_addr, hard_iface->net_dev->name);
533 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
539 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
540 * @soft_iface: netdev struct of the mesh interface
542 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
544 const struct batadv_hard_iface *hard_iface;
545 unsigned short lower_header_len = ETH_HLEN;
546 unsigned short lower_headroom = 0;
547 unsigned short lower_tailroom = 0;
548 unsigned short needed_headroom;
551 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
552 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
555 if (hard_iface->soft_iface != soft_iface)
558 lower_header_len = max_t(unsigned short, lower_header_len,
559 hard_iface->net_dev->hard_header_len);
561 lower_headroom = max_t(unsigned short, lower_headroom,
562 hard_iface->net_dev->needed_headroom);
564 lower_tailroom = max_t(unsigned short, lower_tailroom,
565 hard_iface->net_dev->needed_tailroom);
569 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
570 needed_headroom += batadv_max_header_len();
572 /* fragmentation headers don't strip the unicast/... header */
573 needed_headroom += sizeof(struct batadv_frag_packet);
575 soft_iface->needed_headroom = needed_headroom;
576 soft_iface->needed_tailroom = lower_tailroom;
579 int batadv_hardif_min_mtu(struct net_device *soft_iface)
581 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
582 const struct batadv_hard_iface *hard_iface;
583 int min_mtu = INT_MAX;
586 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
587 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
588 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
591 if (hard_iface->soft_iface != soft_iface)
594 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
598 if (atomic_read(&bat_priv->fragmentation) == 0)
601 /* with fragmentation enabled the maximum size of internally generated
602 * packets such as translation table exchanges or tvlv containers, etc
603 * has to be calculated
605 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
606 min_mtu -= sizeof(struct batadv_frag_packet);
607 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
610 /* report to the other components the maximum amount of bytes that
611 * batman-adv can send over the wire (without considering the payload
612 * overhead). For example, this value is used by TT to compute the
613 * maximum local table table size
615 atomic_set(&bat_priv->packet_size_max, min_mtu);
617 /* the real soft-interface MTU is computed by removing the payload
618 * overhead from the maximum amount of bytes that was just computed.
620 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
622 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
625 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
626 void batadv_update_min_mtu(struct net_device *soft_iface)
628 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
630 /* Check if the local translate table should be cleaned up to match a
631 * new (and smaller) MTU.
633 batadv_tt_local_resize_to_mtu(soft_iface);
637 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
639 struct batadv_priv *bat_priv;
640 struct batadv_hard_iface *primary_if = NULL;
642 if (hard_iface->if_status != BATADV_IF_INACTIVE)
645 bat_priv = netdev_priv(hard_iface->soft_iface);
647 bat_priv->algo_ops->iface.update_mac(hard_iface);
648 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
650 /* the first active interface becomes our primary interface or
651 * the next active interface after the old primary interface was removed
653 primary_if = batadv_primary_if_get_selected(bat_priv);
655 batadv_primary_if_select(bat_priv, hard_iface);
657 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
658 hard_iface->net_dev->name);
660 batadv_update_min_mtu(hard_iface->soft_iface);
662 if (bat_priv->algo_ops->iface.activate)
663 bat_priv->algo_ops->iface.activate(hard_iface);
667 batadv_hardif_put(primary_if);
671 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
673 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
674 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
677 hard_iface->if_status = BATADV_IF_INACTIVE;
679 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
680 hard_iface->net_dev->name);
682 batadv_update_min_mtu(hard_iface->soft_iface);
686 * batadv_master_del_slave - remove hard_iface from the current master interface
687 * @slave: the interface enslaved in another master
688 * @master: the master from which slave has to be removed
690 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
691 * is free'd and master can correctly change its internal state.
693 * Return: 0 on success, a negative value representing the error otherwise
695 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
696 struct net_device *master)
704 if (master->netdev_ops->ndo_del_slave)
705 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
710 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
711 struct net *net, const char *iface_name)
713 struct batadv_priv *bat_priv;
714 struct net_device *soft_iface, *master;
715 __be16 ethertype = htons(ETH_P_BATMAN);
716 int max_header_len = batadv_max_header_len();
719 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
722 kref_get(&hard_iface->refcount);
724 soft_iface = dev_get_by_name(net, iface_name);
727 soft_iface = batadv_softif_create(net, iface_name);
734 /* dev_get_by_name() increases the reference counter for us */
735 dev_hold(soft_iface);
738 if (!batadv_softif_is_valid(soft_iface)) {
739 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
745 /* check if the interface is enslaved in another virtual one and
746 * in that case unlink it first
748 master = netdev_master_upper_dev_get(hard_iface->net_dev);
749 ret = batadv_master_del_slave(hard_iface, master);
753 hard_iface->soft_iface = soft_iface;
754 bat_priv = netdev_priv(hard_iface->soft_iface);
756 if (bat_priv->num_ifaces >= UINT_MAX) {
761 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
762 soft_iface, NULL, NULL);
766 ret = bat_priv->algo_ops->iface.enable(hard_iface);
770 hard_iface->if_num = bat_priv->num_ifaces;
771 bat_priv->num_ifaces++;
772 hard_iface->if_status = BATADV_IF_INACTIVE;
773 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
775 bat_priv->algo_ops->iface.disable(hard_iface);
776 bat_priv->num_ifaces--;
777 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
781 kref_get(&hard_iface->refcount);
782 hard_iface->batman_adv_ptype.type = ethertype;
783 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
784 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
785 dev_add_pack(&hard_iface->batman_adv_ptype);
787 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
788 hard_iface->net_dev->name);
790 if (atomic_read(&bat_priv->fragmentation) &&
791 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
792 batadv_info(hard_iface->soft_iface,
793 "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",
794 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
795 ETH_DATA_LEN + max_header_len);
797 if (!atomic_read(&bat_priv->fragmentation) &&
798 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
799 batadv_info(hard_iface->soft_iface,
800 "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",
801 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
802 ETH_DATA_LEN + max_header_len);
804 if (batadv_hardif_is_iface_up(hard_iface))
805 batadv_hardif_activate_interface(hard_iface);
807 batadv_err(hard_iface->soft_iface,
808 "Not using interface %s (retrying later): interface not active\n",
809 hard_iface->net_dev->name);
811 batadv_hardif_recalc_extra_skbroom(soft_iface);
813 if (bat_priv->algo_ops->iface.enabled)
814 bat_priv->algo_ops->iface.enabled(hard_iface);
820 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
822 hard_iface->soft_iface = NULL;
825 batadv_hardif_put(hard_iface);
829 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
830 enum batadv_hard_if_cleanup autodel)
832 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
833 struct batadv_hard_iface *primary_if = NULL;
835 batadv_hardif_deactivate_interface(hard_iface);
837 if (hard_iface->if_status != BATADV_IF_INACTIVE)
840 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
841 hard_iface->net_dev->name);
842 dev_remove_pack(&hard_iface->batman_adv_ptype);
843 batadv_hardif_put(hard_iface);
845 bat_priv->num_ifaces--;
846 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
848 primary_if = batadv_primary_if_get_selected(bat_priv);
849 if (hard_iface == primary_if) {
850 struct batadv_hard_iface *new_if;
852 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
853 batadv_primary_if_select(bat_priv, new_if);
856 batadv_hardif_put(new_if);
859 bat_priv->algo_ops->iface.disable(hard_iface);
860 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
862 /* delete all references to this hard_iface */
863 batadv_purge_orig_ref(bat_priv);
864 batadv_purge_outstanding_packets(bat_priv, hard_iface);
865 dev_put(hard_iface->soft_iface);
867 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
868 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
870 /* nobody uses this interface anymore */
871 if (bat_priv->num_ifaces == 0) {
872 batadv_gw_check_client_stop(bat_priv);
874 if (autodel == BATADV_IF_CLEANUP_AUTO)
875 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
878 hard_iface->soft_iface = NULL;
879 batadv_hardif_put(hard_iface);
883 batadv_hardif_put(primary_if);
886 static struct batadv_hard_iface *
887 batadv_hardif_add_interface(struct net_device *net_dev)
889 struct batadv_hard_iface *hard_iface;
894 if (!batadv_is_valid_iface(net_dev))
899 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
903 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
907 hard_iface->if_num = 0;
908 hard_iface->net_dev = net_dev;
909 hard_iface->soft_iface = NULL;
910 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
912 ret = batadv_debugfs_add_hardif(hard_iface);
916 INIT_LIST_HEAD(&hard_iface->list);
917 INIT_HLIST_HEAD(&hard_iface->neigh_list);
919 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
920 spin_lock_init(&hard_iface->neigh_list_lock);
921 kref_init(&hard_iface->refcount);
923 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
924 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
925 if (batadv_is_wifi_hardif(hard_iface))
926 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
928 batadv_v_hardif_init(hard_iface);
930 batadv_check_known_mac_addr(hard_iface->net_dev);
931 kref_get(&hard_iface->refcount);
932 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
937 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
946 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
950 /* first deactivate interface */
951 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
952 batadv_hardif_disable_interface(hard_iface,
953 BATADV_IF_CLEANUP_KEEP);
955 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
958 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
959 batadv_debugfs_del_hardif(hard_iface);
960 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
961 batadv_hardif_put(hard_iface);
964 void batadv_hardif_remove_interfaces(void)
966 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
969 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
970 &batadv_hardif_list, list) {
971 list_del_rcu(&hard_iface->list);
972 batadv_hardif_remove_interface(hard_iface);
978 * batadv_hard_if_event_softif() - Handle events for soft interfaces
979 * @event: NETDEV_* event to handle
980 * @net_dev: net_device which generated an event
982 * Return: NOTIFY_* result
984 static int batadv_hard_if_event_softif(unsigned long event,
985 struct net_device *net_dev)
987 struct batadv_priv *bat_priv;
990 case NETDEV_REGISTER:
991 batadv_sysfs_add_meshif(net_dev);
992 bat_priv = netdev_priv(net_dev);
993 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
995 case NETDEV_CHANGENAME:
996 batadv_debugfs_rename_meshif(net_dev);
1003 static int batadv_hard_if_event(struct notifier_block *this,
1004 unsigned long event, void *ptr)
1006 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
1007 struct batadv_hard_iface *hard_iface;
1008 struct batadv_hard_iface *primary_if = NULL;
1009 struct batadv_priv *bat_priv;
1011 if (batadv_softif_is_valid(net_dev))
1012 return batadv_hard_if_event_softif(event, net_dev);
1014 hard_iface = batadv_hardif_get_by_netdev(net_dev);
1015 if (!hard_iface && (event == NETDEV_REGISTER ||
1016 event == NETDEV_POST_TYPE_CHANGE))
1017 hard_iface = batadv_hardif_add_interface(net_dev);
1024 batadv_hardif_activate_interface(hard_iface);
1026 case NETDEV_GOING_DOWN:
1028 batadv_hardif_deactivate_interface(hard_iface);
1030 case NETDEV_UNREGISTER:
1031 case NETDEV_PRE_TYPE_CHANGE:
1032 list_del_rcu(&hard_iface->list);
1034 batadv_hardif_remove_interface(hard_iface);
1036 case NETDEV_CHANGEMTU:
1037 if (hard_iface->soft_iface)
1038 batadv_update_min_mtu(hard_iface->soft_iface);
1040 case NETDEV_CHANGEADDR:
1041 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
1044 batadv_check_known_mac_addr(hard_iface->net_dev);
1046 bat_priv = netdev_priv(hard_iface->soft_iface);
1047 bat_priv->algo_ops->iface.update_mac(hard_iface);
1049 primary_if = batadv_primary_if_get_selected(bat_priv);
1053 if (hard_iface == primary_if)
1054 batadv_primary_if_update_addr(bat_priv, NULL);
1056 case NETDEV_CHANGEUPPER:
1057 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1058 if (batadv_is_wifi_hardif(hard_iface))
1059 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1061 case NETDEV_CHANGENAME:
1062 batadv_debugfs_rename_hardif(hard_iface);
1069 batadv_hardif_put(hard_iface);
1072 batadv_hardif_put(primary_if);
1076 struct notifier_block batadv_hard_if_notifier = {
1077 .notifier_call = batadv_hard_if_event,