1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "hard-interface.h"
22 #include <linux/atomic.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/errno.h>
25 #include <linux/gfp.h>
27 #include <linux/if_arp.h>
28 #include <linux/if_ether.h>
29 #include <linux/kernel.h>
30 #include <linux/kref.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/netdevice.h>
34 #include <linux/printk.h>
35 #include <linux/rculist.h>
36 #include <linux/rtnetlink.h>
37 #include <linux/slab.h>
38 #include <linux/spinlock.h>
39 #include <net/net_namespace.h>
40 #include <net/rtnetlink.h>
41 #include <uapi/linux/batadv_packet.h>
44 #include "bridge_loop_avoidance.h"
46 #include "distributed-arp-table.h"
47 #include "gateway_client.h"
49 #include "originator.h"
51 #include "soft-interface.h"
53 #include "translation-table.h"
56 * batadv_hardif_release() - release hard interface from lists and queue for
57 * free after rcu grace period
58 * @ref: kref pointer of the hard interface
60 void batadv_hardif_release(struct kref *ref)
62 struct batadv_hard_iface *hard_iface;
64 hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
65 dev_put(hard_iface->net_dev);
67 kfree_rcu(hard_iface, rcu);
71 * batadv_hardif_get_by_netdev() - Get hard interface object of a net_device
72 * @net_dev: net_device to search for
74 * Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors
76 struct batadv_hard_iface *
77 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
79 struct batadv_hard_iface *hard_iface;
82 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
83 if (hard_iface->net_dev == net_dev &&
84 kref_get_unless_zero(&hard_iface->refcount))
96 * batadv_getlink_net() - return link net namespace (of use fallback)
97 * @netdev: net_device to check
98 * @fallback_net: return in case get_link_net is not available for @netdev
100 * Return: result of rtnl_link_ops->get_link_net or @fallback_net
102 static struct net *batadv_getlink_net(const struct net_device *netdev,
103 struct net *fallback_net)
105 if (!netdev->rtnl_link_ops)
108 if (!netdev->rtnl_link_ops->get_link_net)
111 return netdev->rtnl_link_ops->get_link_net(netdev);
115 * batadv_mutual_parents() - check if two devices are each others parent
117 * @net1: 1st devices netns
119 * @net2: 2nd devices netns
121 * veth devices come in pairs and each is the parent of the other!
123 * Return: true if the devices are each others parent, otherwise false
125 static bool batadv_mutual_parents(const struct net_device *dev1,
127 const struct net_device *dev2,
130 int dev1_parent_iflink = dev_get_iflink(dev1);
131 int dev2_parent_iflink = dev_get_iflink(dev2);
132 const struct net *dev1_parent_net;
133 const struct net *dev2_parent_net;
135 dev1_parent_net = batadv_getlink_net(dev1, net1);
136 dev2_parent_net = batadv_getlink_net(dev2, net2);
138 if (!dev1_parent_iflink || !dev2_parent_iflink)
141 return (dev1_parent_iflink == dev2->ifindex) &&
142 (dev2_parent_iflink == dev1->ifindex) &&
143 net_eq(dev1_parent_net, net2) &&
144 net_eq(dev2_parent_net, net1);
148 * batadv_is_on_batman_iface() - check if a device is a batman iface descendant
149 * @net_dev: the device to check
151 * If the user creates any virtual device on top of a batman-adv interface, it
152 * is important to prevent this new interface to be used to create a new mesh
153 * network (this behaviour would lead to a batman-over-batman configuration).
154 * This function recursively checks all the fathers of the device passed as
155 * argument looking for a batman-adv soft interface.
157 * Return: true if the device is descendant of a batman-adv mesh interface (or
158 * if it is a batman-adv interface itself), false otherwise
160 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
162 struct net *net = dev_net(net_dev);
163 struct net_device *parent_dev;
164 struct net *parent_net;
168 /* check if this is a batman-adv mesh interface */
169 if (batadv_softif_is_valid(net_dev))
172 iflink = dev_get_iflink(net_dev);
176 parent_net = batadv_getlink_net(net_dev, net);
178 /* iflink to itself, most likely physical device */
179 if (net == parent_net && iflink == net_dev->ifindex)
182 /* recurse over the parent device */
183 parent_dev = __dev_get_by_index((struct net *)parent_net, iflink);
184 /* if we got a NULL parent_dev there is something broken.. */
186 pr_err("Cannot find parent device\n");
190 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
193 ret = batadv_is_on_batman_iface(parent_dev);
198 static bool batadv_is_valid_iface(const struct net_device *net_dev)
200 if (net_dev->flags & IFF_LOOPBACK)
203 if (net_dev->type != ARPHRD_ETHER)
206 if (net_dev->addr_len != ETH_ALEN)
209 /* no batman over batman */
210 if (batadv_is_on_batman_iface(net_dev))
217 * batadv_get_real_netdevice() - check if the given netdev struct is a virtual
218 * interface on top of another 'real' interface
219 * @netdev: the device to check
221 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
224 * Return: the 'real' net device or the original net device and NULL in case
227 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
229 struct batadv_hard_iface *hard_iface = NULL;
230 struct net_device *real_netdev = NULL;
231 struct net *real_net;
240 iflink = dev_get_iflink(netdev);
246 hard_iface = batadv_hardif_get_by_netdev(netdev);
247 if (!hard_iface || !hard_iface->soft_iface)
250 net = dev_net(hard_iface->soft_iface);
251 real_net = batadv_getlink_net(netdev, net);
253 /* iflink to itself, most likely physical device */
254 if (net == real_net && netdev->ifindex == iflink) {
255 real_netdev = netdev;
256 dev_hold(real_netdev);
260 real_netdev = dev_get_by_index(real_net, iflink);
264 batadv_hardif_put(hard_iface);
269 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
270 * interface on top of another 'real' interface
271 * @net_device: the device to check
273 * Return: the 'real' net device or the original net device and NULL in case
276 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
278 struct net_device *real_netdev;
281 real_netdev = batadv_get_real_netdevice(net_device);
288 * batadv_is_wext_netdev() - check if the given net_device struct is a
289 * wext wifi interface
290 * @net_device: the device to check
292 * Return: true if the net device is a wext wireless device, false
295 static bool batadv_is_wext_netdev(struct net_device *net_device)
300 #ifdef CONFIG_WIRELESS_EXT
301 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
302 * check for wireless_handlers != NULL
304 if (net_device->wireless_handlers)
312 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
313 * cfg80211 wifi interface
314 * @net_device: the device to check
316 * Return: true if the net device is a cfg80211 wireless device, false
319 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
324 /* cfg80211 drivers have to set ieee80211_ptr */
325 if (net_device->ieee80211_ptr)
332 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
333 * @net_device: the device to check
335 * Return: batadv_hard_iface_wifi_flags flags of the device
337 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
340 struct net_device *real_netdev;
342 if (batadv_is_wext_netdev(net_device))
343 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
345 if (batadv_is_cfg80211_netdev(net_device))
346 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
348 real_netdev = batadv_get_real_netdevice(net_device);
352 if (real_netdev == net_device)
355 if (batadv_is_wext_netdev(real_netdev))
356 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
358 if (batadv_is_cfg80211_netdev(real_netdev))
359 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
362 dev_put(real_netdev);
367 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
369 * @hard_iface: the device to check
371 * Return: true if the net device is a cfg80211 wireless device, false
374 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
376 u32 allowed_flags = 0;
378 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
379 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
381 return !!(hard_iface->wifi_flags & allowed_flags);
385 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
386 * @hard_iface: the device to check
388 * Return: true if the net device is a 802.11 wireless device, false otherwise.
390 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
395 return hard_iface->wifi_flags != 0;
399 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
400 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
401 * @orig_addr: the originator of this packet
402 * @orig_neigh: originator address of the forwarder we just got the packet from
403 * (NULL if we originated)
405 * Checks whether a packet needs to be (re)broadcasted on the given interface.
408 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
409 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
410 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
411 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
413 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
414 u8 *orig_addr, u8 *orig_neigh)
416 struct batadv_hardif_neigh_node *hardif_neigh;
417 struct hlist_node *first;
418 int ret = BATADV_HARDIF_BCAST_OK;
422 /* 0 neighbors -> no (re)broadcast */
423 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
425 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
429 /* >1 neighbors -> (re)brodcast */
430 if (rcu_dereference(hlist_next_rcu(first)))
433 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
436 /* 1 neighbor, is the originator -> no rebroadcast */
437 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
438 ret = BATADV_HARDIF_BCAST_DUPORIG;
439 /* 1 neighbor, is the one we received from -> no rebroadcast */
440 } else if (orig_neigh &&
441 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
442 ret = BATADV_HARDIF_BCAST_DUPFWD;
450 static struct batadv_hard_iface *
451 batadv_hardif_get_active(const struct net_device *soft_iface)
453 struct batadv_hard_iface *hard_iface;
456 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
457 if (hard_iface->soft_iface != soft_iface)
460 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
461 kref_get_unless_zero(&hard_iface->refcount))
472 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
473 struct batadv_hard_iface *oldif)
475 struct batadv_hard_iface *primary_if;
477 primary_if = batadv_primary_if_get_selected(bat_priv);
481 batadv_dat_init_own_addr(bat_priv, primary_if);
482 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
485 batadv_hardif_put(primary_if);
488 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
489 struct batadv_hard_iface *new_hard_iface)
491 struct batadv_hard_iface *curr_hard_iface;
496 kref_get(&new_hard_iface->refcount);
498 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
499 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
504 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
505 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
509 batadv_hardif_put(curr_hard_iface);
513 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
515 if (hard_iface->net_dev->flags & IFF_UP)
521 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
523 const struct batadv_hard_iface *hard_iface;
526 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
527 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
528 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
531 if (hard_iface->net_dev == net_dev)
534 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
538 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
539 net_dev->dev_addr, hard_iface->net_dev->name);
540 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
546 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
547 * @soft_iface: netdev struct of the mesh interface
549 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
551 const struct batadv_hard_iface *hard_iface;
552 unsigned short lower_header_len = ETH_HLEN;
553 unsigned short lower_headroom = 0;
554 unsigned short lower_tailroom = 0;
555 unsigned short needed_headroom;
558 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
559 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
562 if (hard_iface->soft_iface != soft_iface)
565 lower_header_len = max_t(unsigned short, lower_header_len,
566 hard_iface->net_dev->hard_header_len);
568 lower_headroom = max_t(unsigned short, lower_headroom,
569 hard_iface->net_dev->needed_headroom);
571 lower_tailroom = max_t(unsigned short, lower_tailroom,
572 hard_iface->net_dev->needed_tailroom);
576 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
577 needed_headroom += batadv_max_header_len();
579 /* fragmentation headers don't strip the unicast/... header */
580 needed_headroom += sizeof(struct batadv_frag_packet);
582 soft_iface->needed_headroom = needed_headroom;
583 soft_iface->needed_tailroom = lower_tailroom;
587 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
588 * @soft_iface: netdev struct of the soft interface
590 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
593 int batadv_hardif_min_mtu(struct net_device *soft_iface)
595 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
596 const struct batadv_hard_iface *hard_iface;
597 int min_mtu = INT_MAX;
600 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
601 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
602 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
605 if (hard_iface->soft_iface != soft_iface)
608 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
612 if (atomic_read(&bat_priv->fragmentation) == 0)
615 /* with fragmentation enabled the maximum size of internally generated
616 * packets such as translation table exchanges or tvlv containers, etc
617 * has to be calculated
619 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
620 min_mtu -= sizeof(struct batadv_frag_packet);
621 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
624 /* report to the other components the maximum amount of bytes that
625 * batman-adv can send over the wire (without considering the payload
626 * overhead). For example, this value is used by TT to compute the
627 * maximum local table table size
629 atomic_set(&bat_priv->packet_size_max, min_mtu);
631 /* the real soft-interface MTU is computed by removing the payload
632 * overhead from the maximum amount of bytes that was just computed.
634 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
636 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
640 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
642 * @soft_iface: netdev struct of the soft interface
644 void batadv_update_min_mtu(struct net_device *soft_iface)
646 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
648 /* Check if the local translate table should be cleaned up to match a
649 * new (and smaller) MTU.
651 batadv_tt_local_resize_to_mtu(soft_iface);
655 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
657 struct batadv_priv *bat_priv;
658 struct batadv_hard_iface *primary_if = NULL;
660 if (hard_iface->if_status != BATADV_IF_INACTIVE)
663 bat_priv = netdev_priv(hard_iface->soft_iface);
665 bat_priv->algo_ops->iface.update_mac(hard_iface);
666 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
668 /* the first active interface becomes our primary interface or
669 * the next active interface after the old primary interface was removed
671 primary_if = batadv_primary_if_get_selected(bat_priv);
673 batadv_primary_if_select(bat_priv, hard_iface);
675 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
676 hard_iface->net_dev->name);
678 batadv_update_min_mtu(hard_iface->soft_iface);
680 if (bat_priv->algo_ops->iface.activate)
681 bat_priv->algo_ops->iface.activate(hard_iface);
685 batadv_hardif_put(primary_if);
689 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
691 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
692 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
695 hard_iface->if_status = BATADV_IF_INACTIVE;
697 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
698 hard_iface->net_dev->name);
700 batadv_update_min_mtu(hard_iface->soft_iface);
704 * batadv_master_del_slave() - remove hard_iface from the current master iface
705 * @slave: the interface enslaved in another master
706 * @master: the master from which slave has to be removed
708 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
709 * is free'd and master can correctly change its internal state.
711 * Return: 0 on success, a negative value representing the error otherwise
713 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
714 struct net_device *master)
722 if (master->netdev_ops->ndo_del_slave)
723 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
729 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
730 * @hard_iface: hard interface to add to soft interface
731 * @net: the applicable net namespace
732 * @iface_name: name of the soft interface
734 * Return: 0 on success or negative error number in case of failure
736 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
737 struct net *net, const char *iface_name)
739 struct batadv_priv *bat_priv;
740 struct net_device *soft_iface, *master;
741 __be16 ethertype = htons(ETH_P_BATMAN);
742 int max_header_len = batadv_max_header_len();
745 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
748 kref_get(&hard_iface->refcount);
750 soft_iface = dev_get_by_name(net, iface_name);
753 soft_iface = batadv_softif_create(net, iface_name);
760 /* dev_get_by_name() increases the reference counter for us */
761 dev_hold(soft_iface);
764 if (!batadv_softif_is_valid(soft_iface)) {
765 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
771 /* check if the interface is enslaved in another virtual one and
772 * in that case unlink it first
774 master = netdev_master_upper_dev_get(hard_iface->net_dev);
775 ret = batadv_master_del_slave(hard_iface, master);
779 hard_iface->soft_iface = soft_iface;
780 bat_priv = netdev_priv(hard_iface->soft_iface);
782 if (bat_priv->num_ifaces >= UINT_MAX) {
787 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
788 soft_iface, NULL, NULL, NULL);
792 ret = bat_priv->algo_ops->iface.enable(hard_iface);
796 hard_iface->if_num = bat_priv->num_ifaces;
797 bat_priv->num_ifaces++;
798 hard_iface->if_status = BATADV_IF_INACTIVE;
799 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
801 bat_priv->algo_ops->iface.disable(hard_iface);
802 bat_priv->num_ifaces--;
803 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
807 kref_get(&hard_iface->refcount);
808 hard_iface->batman_adv_ptype.type = ethertype;
809 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
810 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
811 dev_add_pack(&hard_iface->batman_adv_ptype);
813 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
814 hard_iface->net_dev->name);
816 if (atomic_read(&bat_priv->fragmentation) &&
817 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
818 batadv_info(hard_iface->soft_iface,
819 "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",
820 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
821 ETH_DATA_LEN + max_header_len);
823 if (!atomic_read(&bat_priv->fragmentation) &&
824 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
825 batadv_info(hard_iface->soft_iface,
826 "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",
827 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
828 ETH_DATA_LEN + max_header_len);
830 if (batadv_hardif_is_iface_up(hard_iface))
831 batadv_hardif_activate_interface(hard_iface);
833 batadv_err(hard_iface->soft_iface,
834 "Not using interface %s (retrying later): interface not active\n",
835 hard_iface->net_dev->name);
837 batadv_hardif_recalc_extra_skbroom(soft_iface);
839 if (bat_priv->algo_ops->iface.enabled)
840 bat_priv->algo_ops->iface.enabled(hard_iface);
846 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
848 hard_iface->soft_iface = NULL;
851 batadv_hardif_put(hard_iface);
856 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
857 * @hard_iface: hard interface to be removed
858 * @autodel: whether to delete soft interface when it doesn't contain any other
861 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
862 enum batadv_hard_if_cleanup autodel)
864 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
865 struct batadv_hard_iface *primary_if = NULL;
867 batadv_hardif_deactivate_interface(hard_iface);
869 if (hard_iface->if_status != BATADV_IF_INACTIVE)
872 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
873 hard_iface->net_dev->name);
874 dev_remove_pack(&hard_iface->batman_adv_ptype);
875 batadv_hardif_put(hard_iface);
877 bat_priv->num_ifaces--;
878 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
880 primary_if = batadv_primary_if_get_selected(bat_priv);
881 if (hard_iface == primary_if) {
882 struct batadv_hard_iface *new_if;
884 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
885 batadv_primary_if_select(bat_priv, new_if);
888 batadv_hardif_put(new_if);
891 bat_priv->algo_ops->iface.disable(hard_iface);
892 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
894 /* delete all references to this hard_iface */
895 batadv_purge_orig_ref(bat_priv);
896 batadv_purge_outstanding_packets(bat_priv, hard_iface);
897 dev_put(hard_iface->soft_iface);
899 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
900 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
902 /* nobody uses this interface anymore */
903 if (bat_priv->num_ifaces == 0) {
904 batadv_gw_check_client_stop(bat_priv);
906 if (autodel == BATADV_IF_CLEANUP_AUTO)
907 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
910 hard_iface->soft_iface = NULL;
911 batadv_hardif_put(hard_iface);
915 batadv_hardif_put(primary_if);
918 static struct batadv_hard_iface *
919 batadv_hardif_add_interface(struct net_device *net_dev)
921 struct batadv_hard_iface *hard_iface;
926 if (!batadv_is_valid_iface(net_dev))
931 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
935 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
939 hard_iface->if_num = 0;
940 hard_iface->net_dev = net_dev;
941 hard_iface->soft_iface = NULL;
942 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
944 ret = batadv_debugfs_add_hardif(hard_iface);
948 INIT_LIST_HEAD(&hard_iface->list);
949 INIT_HLIST_HEAD(&hard_iface->neigh_list);
951 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
952 spin_lock_init(&hard_iface->neigh_list_lock);
953 kref_init(&hard_iface->refcount);
955 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
956 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
957 if (batadv_is_wifi_hardif(hard_iface))
958 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
960 batadv_v_hardif_init(hard_iface);
962 batadv_check_known_mac_addr(hard_iface->net_dev);
963 kref_get(&hard_iface->refcount);
964 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
969 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
978 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
982 /* first deactivate interface */
983 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
984 batadv_hardif_disable_interface(hard_iface,
985 BATADV_IF_CLEANUP_KEEP);
987 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
990 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
991 batadv_debugfs_del_hardif(hard_iface);
992 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
993 batadv_hardif_put(hard_iface);
997 * batadv_hardif_remove_interfaces() - Remove all hard interfaces
999 void batadv_hardif_remove_interfaces(void)
1001 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
1004 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
1005 &batadv_hardif_list, list) {
1006 list_del_rcu(&hard_iface->list);
1007 batadv_hardif_remove_interface(hard_iface);
1013 * batadv_hard_if_event_softif() - Handle events for soft interfaces
1014 * @event: NETDEV_* event to handle
1015 * @net_dev: net_device which generated an event
1017 * Return: NOTIFY_* result
1019 static int batadv_hard_if_event_softif(unsigned long event,
1020 struct net_device *net_dev)
1022 struct batadv_priv *bat_priv;
1025 case NETDEV_REGISTER:
1026 batadv_sysfs_add_meshif(net_dev);
1027 bat_priv = netdev_priv(net_dev);
1028 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
1030 case NETDEV_CHANGENAME:
1031 batadv_debugfs_rename_meshif(net_dev);
1038 static int batadv_hard_if_event(struct notifier_block *this,
1039 unsigned long event, void *ptr)
1041 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
1042 struct batadv_hard_iface *hard_iface;
1043 struct batadv_hard_iface *primary_if = NULL;
1044 struct batadv_priv *bat_priv;
1046 if (batadv_softif_is_valid(net_dev))
1047 return batadv_hard_if_event_softif(event, net_dev);
1049 hard_iface = batadv_hardif_get_by_netdev(net_dev);
1050 if (!hard_iface && (event == NETDEV_REGISTER ||
1051 event == NETDEV_POST_TYPE_CHANGE))
1052 hard_iface = batadv_hardif_add_interface(net_dev);
1059 batadv_hardif_activate_interface(hard_iface);
1061 case NETDEV_GOING_DOWN:
1063 batadv_hardif_deactivate_interface(hard_iface);
1065 case NETDEV_UNREGISTER:
1066 case NETDEV_PRE_TYPE_CHANGE:
1067 list_del_rcu(&hard_iface->list);
1069 batadv_hardif_remove_interface(hard_iface);
1071 case NETDEV_CHANGEMTU:
1072 if (hard_iface->soft_iface)
1073 batadv_update_min_mtu(hard_iface->soft_iface);
1075 case NETDEV_CHANGEADDR:
1076 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
1079 batadv_check_known_mac_addr(hard_iface->net_dev);
1081 bat_priv = netdev_priv(hard_iface->soft_iface);
1082 bat_priv->algo_ops->iface.update_mac(hard_iface);
1084 primary_if = batadv_primary_if_get_selected(bat_priv);
1088 if (hard_iface == primary_if)
1089 batadv_primary_if_update_addr(bat_priv, NULL);
1091 case NETDEV_CHANGEUPPER:
1092 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1093 if (batadv_is_wifi_hardif(hard_iface))
1094 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1096 case NETDEV_CHANGENAME:
1097 batadv_debugfs_rename_hardif(hard_iface);
1104 batadv_hardif_put(hard_iface);
1107 batadv_hardif_put(primary_if);
1111 struct notifier_block batadv_hard_if_notifier = {
1112 .notifier_call = batadv_hard_if_event,