1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2019 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 "soft-interface.h"
22 #include <linux/atomic.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/cache.h>
25 #include <linux/compiler.h>
26 #include <linux/cpumask.h>
27 #include <linux/errno.h>
28 #include <linux/etherdevice.h>
29 #include <linux/ethtool.h>
30 #include <linux/gfp.h>
31 #include <linux/if_ether.h>
32 #include <linux/if_vlan.h>
33 #include <linux/jiffies.h>
34 #include <linux/kernel.h>
35 #include <linux/kref.h>
36 #include <linux/list.h>
37 #include <linux/lockdep.h>
38 #include <linux/netdevice.h>
39 #include <linux/percpu.h>
40 #include <linux/printk.h>
41 #include <linux/random.h>
42 #include <linux/rculist.h>
43 #include <linux/rcupdate.h>
44 #include <linux/rtnetlink.h>
45 #include <linux/skbuff.h>
46 #include <linux/slab.h>
47 #include <linux/socket.h>
48 #include <linux/spinlock.h>
49 #include <linux/stddef.h>
50 #include <linux/string.h>
51 #include <linux/types.h>
52 #include <uapi/linux/batadv_packet.h>
55 #include "bridge_loop_avoidance.h"
57 #include "distributed-arp-table.h"
58 #include "gateway_client.h"
59 #include "gateway_common.h"
60 #include "hard-interface.h"
61 #include "multicast.h"
62 #include "network-coding.h"
63 #include "originator.h"
66 #include "translation-table.h"
69 * batadv_skb_head_push() - Increase header size and move (push) head pointer
70 * @skb: packet buffer which should be modified
71 * @len: number of bytes to add
73 * Return: 0 on success or negative error number in case of failure
75 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
79 /* TODO: We must check if we can release all references to non-payload
80 * data using __skb_header_release in our skbs to allow skb_cow_header
81 * to work optimally. This means that those skbs are not allowed to read
82 * or write any data which is before the current position of skb->data
83 * after that call and thus allow other skbs with the same data buffer
84 * to write freely in that area.
86 result = skb_cow_head(skb, len);
94 static int batadv_interface_open(struct net_device *dev)
96 netif_start_queue(dev);
100 static int batadv_interface_release(struct net_device *dev)
102 netif_stop_queue(dev);
107 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
108 * @bat_priv: the bat priv with all the soft interface information
109 * @idx: index of counter to sum up
111 * Return: sum of all cpu-local counters
113 static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
115 u64 *counters, sum = 0;
118 for_each_possible_cpu(cpu) {
119 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
120 sum += counters[idx];
126 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
128 struct batadv_priv *bat_priv = netdev_priv(dev);
129 struct net_device_stats *stats = &dev->stats;
131 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
132 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
133 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
134 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
135 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
139 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
141 struct batadv_priv *bat_priv = netdev_priv(dev);
142 struct batadv_softif_vlan *vlan;
143 struct sockaddr *addr = p;
144 u8 old_addr[ETH_ALEN];
146 if (!is_valid_ether_addr(addr->sa_data))
147 return -EADDRNOTAVAIL;
149 ether_addr_copy(old_addr, dev->dev_addr);
150 ether_addr_copy(dev->dev_addr, addr->sa_data);
152 /* only modify transtable if it has been initialized before */
153 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
157 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
158 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
159 "mac address changed", false);
160 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
161 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
168 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
171 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
180 * batadv_interface_set_rx_mode() - set the rx mode of a device
181 * @dev: registered network device to modify
183 * We do not actually need to set any rx filters for the virtual batman
184 * soft interface. However a dummy handler enables a user to set static
185 * multicast listeners for instance.
187 static void batadv_interface_set_rx_mode(struct net_device *dev)
191 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
192 struct net_device *soft_iface)
194 struct ethhdr *ethhdr;
195 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
196 struct batadv_hard_iface *primary_if = NULL;
197 struct batadv_bcast_packet *bcast_packet;
198 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
200 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
202 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
203 u8 *dst_hint = NULL, chaddr[ETH_ALEN];
204 struct vlan_ethhdr *vhdr;
205 unsigned int header_len = 0;
206 int data_len = skb->len, ret;
207 unsigned long brd_delay = 1;
208 bool do_bcast = false, client_added;
212 enum batadv_forw_mode forw_mode;
213 struct batadv_orig_node *mcast_single_orig = NULL;
214 int network_offset = ETH_HLEN;
217 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
220 /* reset control block to avoid left overs from previous users */
221 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
223 netif_trans_update(soft_iface);
224 vid = batadv_get_vid(skb, 0);
225 ethhdr = eth_hdr(skb);
227 proto = ethhdr->h_proto;
229 switch (ntohs(proto)) {
231 vhdr = vlan_eth_hdr(skb);
232 proto = vhdr->h_vlan_encapsulated_proto;
234 /* drop batman-in-batman packets to prevent loops */
235 if (proto != htons(ETH_P_BATMAN)) {
236 network_offset += VLAN_HLEN;
245 skb_set_network_header(skb, network_offset);
247 if (batadv_bla_tx(bat_priv, skb, vid))
250 /* skb->data might have been reallocated by batadv_bla_tx() */
251 ethhdr = eth_hdr(skb);
253 /* Register the client MAC in the transtable */
254 if (!is_multicast_ether_addr(ethhdr->h_source) &&
255 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
256 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
263 /* Snoop address candidates from DHCPACKs for early DAT filling */
264 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
266 /* don't accept stp packets. STP does not help in meshes.
267 * better use the bridge loop avoidance ...
269 * The same goes for ECTP sent at least by some Cisco Switches,
270 * it might confuse the mesh when used with bridge loop avoidance.
272 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
275 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
278 gw_mode = atomic_read(&bat_priv->gw.mode);
279 if (is_multicast_ether_addr(ethhdr->h_dest)) {
280 /* if gw mode is off, broadcast every packet */
281 if (gw_mode == BATADV_GW_MODE_OFF) {
286 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
288 /* skb->data may have been modified by
289 * batadv_gw_dhcp_recipient_get()
291 ethhdr = eth_hdr(skb);
292 /* if gw_mode is on, broadcast any non-DHCP message.
293 * All the DHCP packets are going to be sent as unicast
295 if (dhcp_rcp == BATADV_DHCP_NO) {
300 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
302 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
303 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
304 /* gateways should not forward any DHCP message if
305 * directed to a DHCP server
310 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
311 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
313 if (forw_mode == BATADV_FORW_NONE)
316 if (forw_mode == BATADV_FORW_SINGLE)
321 batadv_skb_set_priority(skb, 0);
323 /* ethernet packet should be broadcasted */
325 primary_if = batadv_primary_if_get_selected(bat_priv);
329 /* in case of ARP request, we do not immediately broadcasti the
330 * packet, instead we first wait for DAT to try to retrieve the
333 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
334 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
336 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
339 bcast_packet = (struct batadv_bcast_packet *)skb->data;
340 bcast_packet->version = BATADV_COMPAT_VERSION;
341 bcast_packet->ttl = BATADV_TTL;
343 /* batman packet type: broadcast */
344 bcast_packet->packet_type = BATADV_BCAST;
345 bcast_packet->reserved = 0;
347 /* hw address of first interface is the orig mac because only
348 * this mac is known throughout the mesh
350 ether_addr_copy(bcast_packet->orig,
351 primary_if->net_dev->dev_addr);
353 /* set broadcast sequence number */
354 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
355 bcast_packet->seqno = htonl(seqno);
357 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
359 /* a copy is stored in the bcast list, therefore removing
366 /* DHCP packets going to a server will use the GW feature */
367 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
368 ret = batadv_gw_out_of_range(bat_priv, skb);
371 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
372 } else if (mcast_single_orig) {
373 ret = batadv_send_skb_unicast(bat_priv, skb,
375 mcast_single_orig, vid);
377 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
381 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
383 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
386 if (ret != NET_XMIT_SUCCESS)
390 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
391 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
397 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
399 if (mcast_single_orig)
400 batadv_orig_node_put(mcast_single_orig);
402 batadv_hardif_put(primary_if);
407 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
408 * @soft_iface: local interface which will receive the ethernet frame
409 * @skb: ethernet frame for @soft_iface
410 * @hdr_size: size of already parsed batman-adv header
411 * @orig_node: originator from which the batman-adv packet was sent
413 * Sends a ethernet frame to the receive path of the local @soft_iface.
414 * skb->data has still point to the batman-adv header with the size @hdr_size.
415 * The caller has to have parsed this header already and made sure that at least
416 * @hdr_size bytes are still available for pull in @skb.
418 * The packet may still get dropped. This can happen when the encapsulated
419 * ethernet frame is invalid or contains again an batman-adv packet. Also
420 * unicast packets will be dropped directly when it was sent between two
423 void batadv_interface_rx(struct net_device *soft_iface,
424 struct sk_buff *skb, int hdr_size,
425 struct batadv_orig_node *orig_node)
427 struct batadv_bcast_packet *batadv_bcast_packet;
428 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
429 struct vlan_ethhdr *vhdr;
430 struct ethhdr *ethhdr;
434 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
435 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
437 skb_pull_rcsum(skb, hdr_size);
438 skb_reset_mac_header(skb);
440 /* clean the netfilter state now that the batman-adv header has been
445 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
448 vid = batadv_get_vid(skb, 0);
449 ethhdr = eth_hdr(skb);
451 switch (ntohs(ethhdr->h_proto)) {
453 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
456 vhdr = (struct vlan_ethhdr *)skb->data;
458 /* drop batman-in-batman packets to prevent loops */
459 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
467 /* skb->dev & skb->pkt_type are set here */
468 skb->protocol = eth_type_trans(skb, soft_iface);
469 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
471 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
472 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
473 skb->len + ETH_HLEN);
475 /* Let the bridge loop avoidance check the packet. If will
476 * not handle it, we can safely push it up.
478 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
482 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
483 ethhdr->h_source, vid);
485 if (is_multicast_ether_addr(ethhdr->h_dest)) {
486 /* set the mark on broadcast packets if AP isolation is ON and
487 * the packet is coming from an "isolated" client
489 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
490 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
492 /* save bits in skb->mark not covered by the mask and
493 * apply the mark on the rest
495 skb->mark &= ~bat_priv->isolation_mark_mask;
496 skb->mark |= bat_priv->isolation_mark;
498 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
499 ethhdr->h_dest, vid)) {
513 * batadv_softif_vlan_release() - release vlan from lists and queue for free
514 * after rcu grace period
515 * @ref: kref pointer of the vlan object
517 static void batadv_softif_vlan_release(struct kref *ref)
519 struct batadv_softif_vlan *vlan;
521 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
523 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
524 hlist_del_rcu(&vlan->list);
525 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
527 kfree_rcu(vlan, rcu);
531 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
532 * possibly release it
533 * @vlan: the vlan object to release
535 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
540 kref_put(&vlan->refcount, batadv_softif_vlan_release);
544 * batadv_softif_vlan_get() - get the vlan object for a specific vid
545 * @bat_priv: the bat priv with all the soft interface information
546 * @vid: the identifier of the vlan object to retrieve
548 * Return: the private data of the vlan matching the vid passed as argument or
549 * NULL otherwise. The refcounter of the returned object is incremented by 1.
551 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
554 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
557 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
558 if (vlan_tmp->vid != vid)
561 if (!kref_get_unless_zero(&vlan_tmp->refcount))
573 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
574 * @bat_priv: the bat priv with all the soft interface information
575 * @vid: the VLAN identifier
577 * Return: 0 on success, a negative error otherwise.
579 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
581 struct batadv_softif_vlan *vlan;
584 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
586 vlan = batadv_softif_vlan_get(bat_priv, vid);
588 batadv_softif_vlan_put(vlan);
589 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
593 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
595 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
599 vlan->bat_priv = bat_priv;
601 kref_init(&vlan->refcount);
603 atomic_set(&vlan->ap_isolation, 0);
605 kref_get(&vlan->refcount);
606 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
607 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
609 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
610 * sleeping behavior of the sysfs functions and the fs_reclaim lock
612 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
614 /* ref for the function */
615 batadv_softif_vlan_put(vlan);
617 /* ref for the list */
618 batadv_softif_vlan_put(vlan);
622 /* add a new TT local entry. This one will be marked with the NOPURGE
625 batadv_tt_local_add(bat_priv->soft_iface,
626 bat_priv->soft_iface->dev_addr, vid,
627 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
629 /* don't return reference to new softif_vlan */
630 batadv_softif_vlan_put(vlan);
636 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
637 * @bat_priv: the bat priv with all the soft interface information
638 * @vlan: the object to remove
640 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
641 struct batadv_softif_vlan *vlan)
643 /* explicitly remove the associated TT local entry because it is marked
644 * with the NOPURGE flag
646 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
647 vlan->vid, "vlan interface destroyed", false);
649 batadv_sysfs_del_vlan(bat_priv, vlan);
650 batadv_softif_vlan_put(vlan);
654 * batadv_interface_add_vid() - ndo_add_vid API implementation
655 * @dev: the netdev of the mesh interface
656 * @proto: protocol of the the vlan id
657 * @vid: identifier of the new vlan
659 * Set up all the internal structures for handling the new vlan on top of the
662 * Return: 0 on success or a negative error code in case of failure.
664 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
667 struct batadv_priv *bat_priv = netdev_priv(dev);
668 struct batadv_softif_vlan *vlan;
671 /* only 802.1Q vlans are supported.
672 * batman-adv does not know how to handle other types
674 if (proto != htons(ETH_P_8021Q))
677 vid |= BATADV_VLAN_HAS_TAG;
679 /* if a new vlan is getting created and it already exists, it means that
680 * it was not deleted yet. batadv_softif_vlan_get() increases the
681 * refcount in order to revive the object.
683 * if it does not exist then create it.
685 vlan = batadv_softif_vlan_get(bat_priv, vid);
687 return batadv_softif_create_vlan(bat_priv, vid);
689 /* recreate the sysfs object if it was already destroyed (and it should
690 * be since we received a kill_vid() for this vlan
693 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
695 batadv_softif_vlan_put(vlan);
700 /* add a new TT local entry. This one will be marked with the NOPURGE
701 * flag. This must be added again, even if the vlan object already
702 * exists, because the entry was deleted by kill_vid()
704 batadv_tt_local_add(bat_priv->soft_iface,
705 bat_priv->soft_iface->dev_addr, vid,
706 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
712 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
713 * @dev: the netdev of the mesh interface
714 * @proto: protocol of the the vlan id
715 * @vid: identifier of the deleted vlan
717 * Destroy all the internal structures used to handle the vlan identified by vid
718 * on top of the mesh interface
720 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
721 * or -ENOENT if the specified vlan id wasn't registered.
723 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
726 struct batadv_priv *bat_priv = netdev_priv(dev);
727 struct batadv_softif_vlan *vlan;
729 /* only 802.1Q vlans are supported. batman-adv does not know how to
732 if (proto != htons(ETH_P_8021Q))
735 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
739 batadv_softif_destroy_vlan(bat_priv, vlan);
741 /* finally free the vlan object */
742 batadv_softif_vlan_put(vlan);
747 /* batman-adv network devices have devices nesting below it and are a special
748 * "super class" of normal network devices; split their locks off into a
749 * separate class since they always nest.
751 static struct lock_class_key batadv_netdev_xmit_lock_key;
752 static struct lock_class_key batadv_netdev_addr_lock_key;
755 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
756 * @dev: device which owns the tx queue
757 * @txq: tx queue to modify
758 * @_unused: always NULL
760 static void batadv_set_lockdep_class_one(struct net_device *dev,
761 struct netdev_queue *txq,
764 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
768 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
769 * @dev: network device to modify
771 static void batadv_set_lockdep_class(struct net_device *dev)
773 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
774 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
778 * batadv_softif_init_late() - late stage initialization of soft interface
779 * @dev: registered network device to modify
781 * Return: error code on failures
783 static int batadv_softif_init_late(struct net_device *dev)
785 struct batadv_priv *bat_priv;
788 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
790 batadv_set_lockdep_class(dev);
792 bat_priv = netdev_priv(dev);
793 bat_priv->soft_iface = dev;
795 /* batadv_interface_stats() needs to be available as soon as
796 * register_netdevice() has been called
798 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
799 if (!bat_priv->bat_counters)
802 atomic_set(&bat_priv->aggregated_ogms, 1);
803 atomic_set(&bat_priv->bonding, 0);
804 #ifdef CONFIG_BATMAN_ADV_BLA
805 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
807 #ifdef CONFIG_BATMAN_ADV_DAT
808 atomic_set(&bat_priv->distributed_arp_table, 1);
810 #ifdef CONFIG_BATMAN_ADV_MCAST
811 bat_priv->mcast.querier_ipv4.exists = false;
812 bat_priv->mcast.querier_ipv4.shadowing = false;
813 bat_priv->mcast.querier_ipv6.exists = false;
814 bat_priv->mcast.querier_ipv6.shadowing = false;
815 bat_priv->mcast.flags = BATADV_NO_FLAGS;
816 atomic_set(&bat_priv->multicast_mode, 1);
817 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
818 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
819 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
821 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
822 atomic_set(&bat_priv->gw.bandwidth_down, 100);
823 atomic_set(&bat_priv->gw.bandwidth_up, 20);
824 atomic_set(&bat_priv->orig_interval, 1000);
825 atomic_set(&bat_priv->hop_penalty, 30);
826 #ifdef CONFIG_BATMAN_ADV_DEBUG
827 atomic_set(&bat_priv->log_level, 0);
829 atomic_set(&bat_priv->fragmentation, 1);
830 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
831 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
832 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
834 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
835 atomic_set(&bat_priv->bcast_seqno, 1);
836 atomic_set(&bat_priv->tt.vn, 0);
837 atomic_set(&bat_priv->tt.local_changes, 0);
838 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
839 #ifdef CONFIG_BATMAN_ADV_BLA
840 atomic_set(&bat_priv->bla.num_requests, 0);
842 atomic_set(&bat_priv->tp_num, 0);
844 bat_priv->tt.last_changeset = NULL;
845 bat_priv->tt.last_changeset_len = 0;
846 bat_priv->isolation_mark = 0;
847 bat_priv->isolation_mark_mask = 0;
849 /* randomize initial seqno to avoid collision */
850 get_random_bytes(&random_seqno, sizeof(random_seqno));
851 atomic_set(&bat_priv->frag_seqno, random_seqno);
853 bat_priv->primary_if = NULL;
855 batadv_nc_init_bat_priv(bat_priv);
857 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
859 goto free_bat_counters;
861 ret = batadv_debugfs_add_meshif(dev);
863 goto free_bat_counters;
865 ret = batadv_mesh_init(dev);
872 batadv_debugfs_del_meshif(dev);
874 free_percpu(bat_priv->bat_counters);
875 bat_priv->bat_counters = NULL;
881 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
882 * @dev: batadv_soft_interface used as master interface
883 * @slave_dev: net_device which should become the slave interface
884 * @extack: extended ACK report struct
886 * Return: 0 if successful or error otherwise.
888 static int batadv_softif_slave_add(struct net_device *dev,
889 struct net_device *slave_dev,
890 struct netlink_ext_ack *extack)
892 struct batadv_hard_iface *hard_iface;
893 struct net *net = dev_net(dev);
896 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
897 if (!hard_iface || hard_iface->soft_iface)
900 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
904 batadv_hardif_put(hard_iface);
909 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
910 * @dev: batadv_soft_interface used as master interface
911 * @slave_dev: net_device which should be removed from the master interface
913 * Return: 0 if successful or error otherwise.
915 static int batadv_softif_slave_del(struct net_device *dev,
916 struct net_device *slave_dev)
918 struct batadv_hard_iface *hard_iface;
921 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
923 if (!hard_iface || hard_iface->soft_iface != dev)
926 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
931 batadv_hardif_put(hard_iface);
935 static const struct net_device_ops batadv_netdev_ops = {
936 .ndo_init = batadv_softif_init_late,
937 .ndo_open = batadv_interface_open,
938 .ndo_stop = batadv_interface_release,
939 .ndo_get_stats = batadv_interface_stats,
940 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
941 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
942 .ndo_set_mac_address = batadv_interface_set_mac_addr,
943 .ndo_change_mtu = batadv_interface_change_mtu,
944 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
945 .ndo_start_xmit = batadv_interface_tx,
946 .ndo_validate_addr = eth_validate_addr,
947 .ndo_add_slave = batadv_softif_slave_add,
948 .ndo_del_slave = batadv_softif_slave_del,
951 static void batadv_get_drvinfo(struct net_device *dev,
952 struct ethtool_drvinfo *info)
954 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
955 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
956 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
957 strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
960 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
961 * Declare each description string in struct.name[] to get fixed sized buffer
962 * and compile time checking for strings longer than ETH_GSTRING_LEN.
964 static const struct {
965 const char name[ETH_GSTRING_LEN];
966 } batadv_counters_strings[] = {
983 { "frag_fwd_bytes" },
986 { "tt_response_tx" },
987 { "tt_response_rx" },
988 { "tt_roam_adv_tx" },
989 { "tt_roam_adv_rx" },
990 #ifdef CONFIG_BATMAN_ADV_DAT
995 { "dat_cached_reply_tx" },
997 #ifdef CONFIG_BATMAN_ADV_NC
1001 { "nc_recode_bytes" },
1004 { "nc_decode_bytes" },
1005 { "nc_decode_failed" },
1010 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1012 if (stringset == ETH_SS_STATS)
1013 memcpy(data, batadv_counters_strings,
1014 sizeof(batadv_counters_strings));
1017 static void batadv_get_ethtool_stats(struct net_device *dev,
1018 struct ethtool_stats *stats, u64 *data)
1020 struct batadv_priv *bat_priv = netdev_priv(dev);
1023 for (i = 0; i < BATADV_CNT_NUM; i++)
1024 data[i] = batadv_sum_counter(bat_priv, i);
1027 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1029 if (stringset == ETH_SS_STATS)
1030 return BATADV_CNT_NUM;
1035 static const struct ethtool_ops batadv_ethtool_ops = {
1036 .get_drvinfo = batadv_get_drvinfo,
1037 .get_link = ethtool_op_get_link,
1038 .get_strings = batadv_get_strings,
1039 .get_ethtool_stats = batadv_get_ethtool_stats,
1040 .get_sset_count = batadv_get_sset_count,
1044 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1045 * @dev: Device to cleanup and remove
1047 static void batadv_softif_free(struct net_device *dev)
1049 batadv_debugfs_del_meshif(dev);
1050 batadv_mesh_free(dev);
1052 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1053 * their tasks. Wait for them all to be finished before freeing the
1054 * netdev and its private data (bat_priv)
1060 * batadv_softif_init_early() - early stage initialization of soft interface
1061 * @dev: registered network device to modify
1063 static void batadv_softif_init_early(struct net_device *dev)
1067 dev->netdev_ops = &batadv_netdev_ops;
1068 dev->needs_free_netdev = true;
1069 dev->priv_destructor = batadv_softif_free;
1070 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1071 dev->features |= NETIF_F_LLTX;
1072 dev->priv_flags |= IFF_NO_QUEUE;
1074 /* can't call min_mtu, because the needed variables
1075 * have not been initialized yet
1077 dev->mtu = ETH_DATA_LEN;
1079 /* generate random address */
1080 eth_hw_addr_random(dev);
1082 dev->ethtool_ops = &batadv_ethtool_ops;
1086 * batadv_softif_create() - Create and register soft interface
1087 * @net: the applicable net namespace
1088 * @name: name of the new soft interface
1090 * Return: newly allocated soft_interface, NULL on errors
1092 struct net_device *batadv_softif_create(struct net *net, const char *name)
1094 struct net_device *soft_iface;
1097 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1098 NET_NAME_UNKNOWN, batadv_softif_init_early);
1102 dev_net_set(soft_iface, net);
1104 soft_iface->rtnl_link_ops = &batadv_link_ops;
1106 ret = register_netdevice(soft_iface);
1108 pr_err("Unable to register the batman interface '%s': %i\n",
1110 free_netdev(soft_iface);
1118 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1119 * @soft_iface: the to-be-removed batman-adv interface
1121 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1123 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1124 struct batadv_softif_vlan *vlan;
1128 /* destroy the "untagged" VLAN */
1129 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1131 batadv_softif_destroy_vlan(bat_priv, vlan);
1132 batadv_softif_vlan_put(vlan);
1135 batadv_sysfs_del_meshif(soft_iface);
1136 unregister_netdevice(soft_iface);
1140 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1142 * @soft_iface: the to-be-removed batman-adv interface
1143 * @head: list pointer
1145 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1146 struct list_head *head)
1148 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1149 struct batadv_hard_iface *hard_iface;
1150 struct batadv_softif_vlan *vlan;
1152 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1153 if (hard_iface->soft_iface == soft_iface)
1154 batadv_hardif_disable_interface(hard_iface,
1155 BATADV_IF_CLEANUP_KEEP);
1158 /* destroy the "untagged" VLAN */
1159 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1161 batadv_softif_destroy_vlan(bat_priv, vlan);
1162 batadv_softif_vlan_put(vlan);
1165 batadv_sysfs_del_meshif(soft_iface);
1166 unregister_netdevice_queue(soft_iface, head);
1170 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1171 * @net_dev: device which should be checked
1173 * Return: true when net_dev is a batman-adv interface, false otherwise
1175 bool batadv_softif_is_valid(const struct net_device *net_dev)
1177 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1183 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1185 .priv_size = sizeof(struct batadv_priv),
1186 .setup = batadv_softif_init_early,
1187 .dellink = batadv_softif_destroy_netlink,