1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2019 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
7 #include "soft-interface.h"
10 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h>
12 #include <linux/cache.h>
13 #include <linux/compiler.h>
14 #include <linux/cpumask.h>
15 #include <linux/errno.h>
16 #include <linux/etherdevice.h>
17 #include <linux/ethtool.h>
18 #include <linux/gfp.h>
19 #include <linux/if_ether.h>
20 #include <linux/if_vlan.h>
21 #include <linux/jiffies.h>
22 #include <linux/kernel.h>
23 #include <linux/kref.h>
24 #include <linux/list.h>
25 #include <linux/lockdep.h>
26 #include <linux/netdevice.h>
27 #include <linux/netlink.h>
28 #include <linux/percpu.h>
29 #include <linux/printk.h>
30 #include <linux/random.h>
31 #include <linux/rculist.h>
32 #include <linux/rcupdate.h>
33 #include <linux/rtnetlink.h>
34 #include <linux/skbuff.h>
35 #include <linux/slab.h>
36 #include <linux/socket.h>
37 #include <linux/spinlock.h>
38 #include <linux/stddef.h>
39 #include <linux/string.h>
40 #include <linux/types.h>
41 #include <uapi/linux/batadv_packet.h>
42 #include <uapi/linux/batman_adv.h>
45 #include "bridge_loop_avoidance.h"
47 #include "distributed-arp-table.h"
48 #include "gateway_client.h"
49 #include "hard-interface.h"
50 #include "multicast.h"
51 #include "network-coding.h"
52 #include "originator.h"
55 #include "translation-table.h"
58 * batadv_skb_head_push() - Increase header size and move (push) head pointer
59 * @skb: packet buffer which should be modified
60 * @len: number of bytes to add
62 * Return: 0 on success or negative error number in case of failure
64 int batadv_skb_head_push(struct sk_buff
*skb
, unsigned int len
)
68 /* TODO: We must check if we can release all references to non-payload
69 * data using __skb_header_release in our skbs to allow skb_cow_header
70 * to work optimally. This means that those skbs are not allowed to read
71 * or write any data which is before the current position of skb->data
72 * after that call and thus allow other skbs with the same data buffer
73 * to write freely in that area.
75 result
= skb_cow_head(skb
, len
);
83 static int batadv_interface_open(struct net_device
*dev
)
85 netif_start_queue(dev
);
89 static int batadv_interface_release(struct net_device
*dev
)
91 netif_stop_queue(dev
);
96 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
97 * @bat_priv: the bat priv with all the soft interface information
98 * @idx: index of counter to sum up
100 * Return: sum of all cpu-local counters
102 static u64
batadv_sum_counter(struct batadv_priv
*bat_priv
, size_t idx
)
104 u64
*counters
, sum
= 0;
107 for_each_possible_cpu(cpu
) {
108 counters
= per_cpu_ptr(bat_priv
->bat_counters
, cpu
);
109 sum
+= counters
[idx
];
115 static struct net_device_stats
*batadv_interface_stats(struct net_device
*dev
)
117 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
118 struct net_device_stats
*stats
= &dev
->stats
;
120 stats
->tx_packets
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX
);
121 stats
->tx_bytes
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX_BYTES
);
122 stats
->tx_dropped
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX_DROPPED
);
123 stats
->rx_packets
= batadv_sum_counter(bat_priv
, BATADV_CNT_RX
);
124 stats
->rx_bytes
= batadv_sum_counter(bat_priv
, BATADV_CNT_RX_BYTES
);
128 static int batadv_interface_set_mac_addr(struct net_device
*dev
, void *p
)
130 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
131 struct batadv_softif_vlan
*vlan
;
132 struct sockaddr
*addr
= p
;
133 u8 old_addr
[ETH_ALEN
];
135 if (!is_valid_ether_addr(addr
->sa_data
))
136 return -EADDRNOTAVAIL
;
138 ether_addr_copy(old_addr
, dev
->dev_addr
);
139 ether_addr_copy(dev
->dev_addr
, addr
->sa_data
);
141 /* only modify transtable if it has been initialized before */
142 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
146 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
147 batadv_tt_local_remove(bat_priv
, old_addr
, vlan
->vid
,
148 "mac address changed", false);
149 batadv_tt_local_add(dev
, addr
->sa_data
, vlan
->vid
,
150 BATADV_NULL_IFINDEX
, BATADV_NO_MARK
);
157 static int batadv_interface_change_mtu(struct net_device
*dev
, int new_mtu
)
160 if (new_mtu
< 68 || new_mtu
> batadv_hardif_min_mtu(dev
))
169 * batadv_interface_set_rx_mode() - set the rx mode of a device
170 * @dev: registered network device to modify
172 * We do not actually need to set any rx filters for the virtual batman
173 * soft interface. However a dummy handler enables a user to set static
174 * multicast listeners for instance.
176 static void batadv_interface_set_rx_mode(struct net_device
*dev
)
180 static netdev_tx_t
batadv_interface_tx(struct sk_buff
*skb
,
181 struct net_device
*soft_iface
)
183 struct ethhdr
*ethhdr
;
184 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
185 struct batadv_hard_iface
*primary_if
= NULL
;
186 struct batadv_bcast_packet
*bcast_packet
;
187 static const u8 stp_addr
[ETH_ALEN
] = {0x01, 0x80, 0xC2, 0x00,
189 static const u8 ectp_addr
[ETH_ALEN
] = {0xCF, 0x00, 0x00, 0x00,
191 enum batadv_dhcp_recipient dhcp_rcp
= BATADV_DHCP_NO
;
192 u8
*dst_hint
= NULL
, chaddr
[ETH_ALEN
];
193 struct vlan_ethhdr
*vhdr
;
194 unsigned int header_len
= 0;
195 int data_len
= skb
->len
, ret
;
196 unsigned long brd_delay
= 1;
197 bool do_bcast
= false, client_added
;
201 enum batadv_forw_mode forw_mode
= BATADV_FORW_SINGLE
;
202 struct batadv_orig_node
*mcast_single_orig
= NULL
;
203 int network_offset
= ETH_HLEN
;
206 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
209 /* reset control block to avoid left overs from previous users */
210 memset(skb
->cb
, 0, sizeof(struct batadv_skb_cb
));
212 netif_trans_update(soft_iface
);
213 vid
= batadv_get_vid(skb
, 0);
215 skb_reset_mac_header(skb
);
216 ethhdr
= eth_hdr(skb
);
218 proto
= ethhdr
->h_proto
;
220 switch (ntohs(proto
)) {
222 if (!pskb_may_pull(skb
, sizeof(*vhdr
)))
224 vhdr
= vlan_eth_hdr(skb
);
225 proto
= vhdr
->h_vlan_encapsulated_proto
;
227 /* drop batman-in-batman packets to prevent loops */
228 if (proto
!= htons(ETH_P_BATMAN
)) {
229 network_offset
+= VLAN_HLEN
;
238 skb_set_network_header(skb
, network_offset
);
240 if (batadv_bla_tx(bat_priv
, skb
, vid
))
243 /* skb->data might have been reallocated by batadv_bla_tx() */
244 ethhdr
= eth_hdr(skb
);
246 /* Register the client MAC in the transtable */
247 if (!is_multicast_ether_addr(ethhdr
->h_source
) &&
248 !batadv_bla_is_loopdetect_mac(ethhdr
->h_source
)) {
249 client_added
= batadv_tt_local_add(soft_iface
, ethhdr
->h_source
,
256 /* Snoop address candidates from DHCPACKs for early DAT filling */
257 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv
, skb
, proto
, vid
);
259 /* don't accept stp packets. STP does not help in meshes.
260 * better use the bridge loop avoidance ...
262 * The same goes for ECTP sent at least by some Cisco Switches,
263 * it might confuse the mesh when used with bridge loop avoidance.
265 if (batadv_compare_eth(ethhdr
->h_dest
, stp_addr
))
268 if (batadv_compare_eth(ethhdr
->h_dest
, ectp_addr
))
271 gw_mode
= atomic_read(&bat_priv
->gw
.mode
);
272 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
273 /* if gw mode is off, broadcast every packet */
274 if (gw_mode
== BATADV_GW_MODE_OFF
) {
279 dhcp_rcp
= batadv_gw_dhcp_recipient_get(skb
, &header_len
,
281 /* skb->data may have been modified by
282 * batadv_gw_dhcp_recipient_get()
284 ethhdr
= eth_hdr(skb
);
285 /* if gw_mode is on, broadcast any non-DHCP message.
286 * All the DHCP packets are going to be sent as unicast
288 if (dhcp_rcp
== BATADV_DHCP_NO
) {
293 if (dhcp_rcp
== BATADV_DHCP_TO_CLIENT
)
295 else if ((gw_mode
== BATADV_GW_MODE_SERVER
) &&
296 (dhcp_rcp
== BATADV_DHCP_TO_SERVER
))
297 /* gateways should not forward any DHCP message if
298 * directed to a DHCP server
303 if (do_bcast
&& !is_broadcast_ether_addr(ethhdr
->h_dest
)) {
304 forw_mode
= batadv_mcast_forw_mode(bat_priv
, skb
,
306 if (forw_mode
== BATADV_FORW_NONE
)
309 if (forw_mode
== BATADV_FORW_SINGLE
||
310 forw_mode
== BATADV_FORW_SOME
)
315 batadv_skb_set_priority(skb
, 0);
317 /* ethernet packet should be broadcasted */
319 primary_if
= batadv_primary_if_get_selected(bat_priv
);
323 /* in case of ARP request, we do not immediately broadcasti the
324 * packet, instead we first wait for DAT to try to retrieve the
327 if (batadv_dat_snoop_outgoing_arp_request(bat_priv
, skb
))
328 brd_delay
= msecs_to_jiffies(ARP_REQ_DELAY
);
330 if (batadv_skb_head_push(skb
, sizeof(*bcast_packet
)) < 0)
333 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
334 bcast_packet
->version
= BATADV_COMPAT_VERSION
;
335 bcast_packet
->ttl
= BATADV_TTL
;
337 /* batman packet type: broadcast */
338 bcast_packet
->packet_type
= BATADV_BCAST
;
339 bcast_packet
->reserved
= 0;
341 /* hw address of first interface is the orig mac because only
342 * this mac is known throughout the mesh
344 ether_addr_copy(bcast_packet
->orig
,
345 primary_if
->net_dev
->dev_addr
);
347 /* set broadcast sequence number */
348 seqno
= atomic_inc_return(&bat_priv
->bcast_seqno
);
349 bcast_packet
->seqno
= htonl(seqno
);
351 batadv_add_bcast_packet_to_list(bat_priv
, skb
, brd_delay
, true);
353 /* a copy is stored in the bcast list, therefore removing
360 /* DHCP packets going to a server will use the GW feature */
361 if (dhcp_rcp
== BATADV_DHCP_TO_SERVER
) {
362 ret
= batadv_gw_out_of_range(bat_priv
, skb
);
365 ret
= batadv_send_skb_via_gw(bat_priv
, skb
, vid
);
366 } else if (mcast_single_orig
) {
367 ret
= batadv_send_skb_unicast(bat_priv
, skb
,
369 mcast_single_orig
, vid
);
370 } else if (forw_mode
== BATADV_FORW_SOME
) {
371 ret
= batadv_mcast_forw_send(bat_priv
, skb
, vid
);
373 if (batadv_dat_snoop_outgoing_arp_request(bat_priv
,
377 batadv_dat_snoop_outgoing_arp_reply(bat_priv
, skb
);
379 ret
= batadv_send_skb_via_tt(bat_priv
, skb
, dst_hint
,
382 if (ret
!= NET_XMIT_SUCCESS
)
386 batadv_inc_counter(bat_priv
, BATADV_CNT_TX
);
387 batadv_add_counter(bat_priv
, BATADV_CNT_TX_BYTES
, data_len
);
393 batadv_inc_counter(bat_priv
, BATADV_CNT_TX_DROPPED
);
395 if (mcast_single_orig
)
396 batadv_orig_node_put(mcast_single_orig
);
398 batadv_hardif_put(primary_if
);
403 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
404 * @soft_iface: local interface which will receive the ethernet frame
405 * @skb: ethernet frame for @soft_iface
406 * @hdr_size: size of already parsed batman-adv header
407 * @orig_node: originator from which the batman-adv packet was sent
409 * Sends a ethernet frame to the receive path of the local @soft_iface.
410 * skb->data has still point to the batman-adv header with the size @hdr_size.
411 * The caller has to have parsed this header already and made sure that at least
412 * @hdr_size bytes are still available for pull in @skb.
414 * The packet may still get dropped. This can happen when the encapsulated
415 * ethernet frame is invalid or contains again an batman-adv packet. Also
416 * unicast packets will be dropped directly when it was sent between two
419 void batadv_interface_rx(struct net_device
*soft_iface
,
420 struct sk_buff
*skb
, int hdr_size
,
421 struct batadv_orig_node
*orig_node
)
423 struct batadv_bcast_packet
*batadv_bcast_packet
;
424 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
425 struct vlan_ethhdr
*vhdr
;
426 struct ethhdr
*ethhdr
;
430 batadv_bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
431 is_bcast
= (batadv_bcast_packet
->packet_type
== BATADV_BCAST
);
433 skb_pull_rcsum(skb
, hdr_size
);
434 skb_reset_mac_header(skb
);
436 /* clean the netfilter state now that the batman-adv header has been
441 if (unlikely(!pskb_may_pull(skb
, ETH_HLEN
)))
444 vid
= batadv_get_vid(skb
, 0);
445 ethhdr
= eth_hdr(skb
);
447 switch (ntohs(ethhdr
->h_proto
)) {
449 if (!pskb_may_pull(skb
, VLAN_ETH_HLEN
))
452 vhdr
= (struct vlan_ethhdr
*)skb
->data
;
454 /* drop batman-in-batman packets to prevent loops */
455 if (vhdr
->h_vlan_encapsulated_proto
!= htons(ETH_P_BATMAN
))
463 /* skb->dev & skb->pkt_type are set here */
464 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
465 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
467 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
468 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
469 skb
->len
+ ETH_HLEN
);
471 /* Let the bridge loop avoidance check the packet. If will
472 * not handle it, we can safely push it up.
474 if (batadv_bla_rx(bat_priv
, skb
, vid
, is_bcast
))
478 batadv_tt_add_temporary_global_entry(bat_priv
, orig_node
,
479 ethhdr
->h_source
, vid
);
481 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
482 /* set the mark on broadcast packets if AP isolation is ON and
483 * the packet is coming from an "isolated" client
485 if (batadv_vlan_ap_isola_get(bat_priv
, vid
) &&
486 batadv_tt_global_is_isolated(bat_priv
, ethhdr
->h_source
,
488 /* save bits in skb->mark not covered by the mask and
489 * apply the mark on the rest
491 skb
->mark
&= ~bat_priv
->isolation_mark_mask
;
492 skb
->mark
|= bat_priv
->isolation_mark
;
494 } else if (batadv_is_ap_isolated(bat_priv
, ethhdr
->h_source
,
495 ethhdr
->h_dest
, vid
)) {
509 * batadv_softif_vlan_release() - release vlan from lists and queue for free
510 * after rcu grace period
511 * @ref: kref pointer of the vlan object
513 static void batadv_softif_vlan_release(struct kref
*ref
)
515 struct batadv_softif_vlan
*vlan
;
517 vlan
= container_of(ref
, struct batadv_softif_vlan
, refcount
);
519 spin_lock_bh(&vlan
->bat_priv
->softif_vlan_list_lock
);
520 hlist_del_rcu(&vlan
->list
);
521 spin_unlock_bh(&vlan
->bat_priv
->softif_vlan_list_lock
);
523 kfree_rcu(vlan
, rcu
);
527 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
528 * possibly release it
529 * @vlan: the vlan object to release
531 void batadv_softif_vlan_put(struct batadv_softif_vlan
*vlan
)
536 kref_put(&vlan
->refcount
, batadv_softif_vlan_release
);
540 * batadv_softif_vlan_get() - get the vlan object for a specific vid
541 * @bat_priv: the bat priv with all the soft interface information
542 * @vid: the identifier of the vlan object to retrieve
544 * Return: the private data of the vlan matching the vid passed as argument or
545 * NULL otherwise. The refcounter of the returned object is incremented by 1.
547 struct batadv_softif_vlan
*batadv_softif_vlan_get(struct batadv_priv
*bat_priv
,
550 struct batadv_softif_vlan
*vlan_tmp
, *vlan
= NULL
;
553 hlist_for_each_entry_rcu(vlan_tmp
, &bat_priv
->softif_vlan_list
, list
) {
554 if (vlan_tmp
->vid
!= vid
)
557 if (!kref_get_unless_zero(&vlan_tmp
->refcount
))
569 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
570 * @bat_priv: the bat priv with all the soft interface information
571 * @vid: the VLAN identifier
573 * Return: 0 on success, a negative error otherwise.
575 int batadv_softif_create_vlan(struct batadv_priv
*bat_priv
, unsigned short vid
)
577 struct batadv_softif_vlan
*vlan
;
580 spin_lock_bh(&bat_priv
->softif_vlan_list_lock
);
582 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
584 batadv_softif_vlan_put(vlan
);
585 spin_unlock_bh(&bat_priv
->softif_vlan_list_lock
);
589 vlan
= kzalloc(sizeof(*vlan
), GFP_ATOMIC
);
591 spin_unlock_bh(&bat_priv
->softif_vlan_list_lock
);
595 vlan
->bat_priv
= bat_priv
;
597 kref_init(&vlan
->refcount
);
599 atomic_set(&vlan
->ap_isolation
, 0);
601 kref_get(&vlan
->refcount
);
602 hlist_add_head_rcu(&vlan
->list
, &bat_priv
->softif_vlan_list
);
603 spin_unlock_bh(&bat_priv
->softif_vlan_list_lock
);
605 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
606 * sleeping behavior of the sysfs functions and the fs_reclaim lock
608 err
= batadv_sysfs_add_vlan(bat_priv
->soft_iface
, vlan
);
610 /* ref for the function */
611 batadv_softif_vlan_put(vlan
);
613 /* ref for the list */
614 batadv_softif_vlan_put(vlan
);
618 /* add a new TT local entry. This one will be marked with the NOPURGE
621 batadv_tt_local_add(bat_priv
->soft_iface
,
622 bat_priv
->soft_iface
->dev_addr
, vid
,
623 BATADV_NULL_IFINDEX
, BATADV_NO_MARK
);
625 /* don't return reference to new softif_vlan */
626 batadv_softif_vlan_put(vlan
);
632 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
633 * @bat_priv: the bat priv with all the soft interface information
634 * @vlan: the object to remove
636 static void batadv_softif_destroy_vlan(struct batadv_priv
*bat_priv
,
637 struct batadv_softif_vlan
*vlan
)
639 /* explicitly remove the associated TT local entry because it is marked
640 * with the NOPURGE flag
642 batadv_tt_local_remove(bat_priv
, bat_priv
->soft_iface
->dev_addr
,
643 vlan
->vid
, "vlan interface destroyed", false);
645 batadv_sysfs_del_vlan(bat_priv
, vlan
);
646 batadv_softif_vlan_put(vlan
);
650 * batadv_interface_add_vid() - ndo_add_vid API implementation
651 * @dev: the netdev of the mesh interface
652 * @proto: protocol of the the vlan id
653 * @vid: identifier of the new vlan
655 * Set up all the internal structures for handling the new vlan on top of the
658 * Return: 0 on success or a negative error code in case of failure.
660 static int batadv_interface_add_vid(struct net_device
*dev
, __be16 proto
,
663 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
664 struct batadv_softif_vlan
*vlan
;
667 /* only 802.1Q vlans are supported.
668 * batman-adv does not know how to handle other types
670 if (proto
!= htons(ETH_P_8021Q
))
673 vid
|= BATADV_VLAN_HAS_TAG
;
675 /* if a new vlan is getting created and it already exists, it means that
676 * it was not deleted yet. batadv_softif_vlan_get() increases the
677 * refcount in order to revive the object.
679 * if it does not exist then create it.
681 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
683 return batadv_softif_create_vlan(bat_priv
, vid
);
685 /* recreate the sysfs object if it was already destroyed (and it should
686 * be since we received a kill_vid() for this vlan
689 ret
= batadv_sysfs_add_vlan(bat_priv
->soft_iface
, vlan
);
691 batadv_softif_vlan_put(vlan
);
696 /* add a new TT local entry. This one will be marked with the NOPURGE
697 * flag. This must be added again, even if the vlan object already
698 * exists, because the entry was deleted by kill_vid()
700 batadv_tt_local_add(bat_priv
->soft_iface
,
701 bat_priv
->soft_iface
->dev_addr
, vid
,
702 BATADV_NULL_IFINDEX
, BATADV_NO_MARK
);
708 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
709 * @dev: the netdev of the mesh interface
710 * @proto: protocol of the the vlan id
711 * @vid: identifier of the deleted vlan
713 * Destroy all the internal structures used to handle the vlan identified by vid
714 * on top of the mesh interface
716 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
717 * or -ENOENT if the specified vlan id wasn't registered.
719 static int batadv_interface_kill_vid(struct net_device
*dev
, __be16 proto
,
722 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
723 struct batadv_softif_vlan
*vlan
;
725 /* only 802.1Q vlans are supported. batman-adv does not know how to
728 if (proto
!= htons(ETH_P_8021Q
))
731 vlan
= batadv_softif_vlan_get(bat_priv
, vid
| BATADV_VLAN_HAS_TAG
);
735 batadv_softif_destroy_vlan(bat_priv
, vlan
);
737 /* finally free the vlan object */
738 batadv_softif_vlan_put(vlan
);
743 /* batman-adv network devices have devices nesting below it and are a special
744 * "super class" of normal network devices; split their locks off into a
745 * separate class since they always nest.
747 static struct lock_class_key batadv_netdev_xmit_lock_key
;
748 static struct lock_class_key batadv_netdev_addr_lock_key
;
751 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
752 * @dev: device which owns the tx queue
753 * @txq: tx queue to modify
754 * @_unused: always NULL
756 static void batadv_set_lockdep_class_one(struct net_device
*dev
,
757 struct netdev_queue
*txq
,
760 lockdep_set_class(&txq
->_xmit_lock
, &batadv_netdev_xmit_lock_key
);
764 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
765 * @dev: network device to modify
767 static void batadv_set_lockdep_class(struct net_device
*dev
)
769 lockdep_set_class(&dev
->addr_list_lock
, &batadv_netdev_addr_lock_key
);
770 netdev_for_each_tx_queue(dev
, batadv_set_lockdep_class_one
, NULL
);
774 * batadv_softif_init_late() - late stage initialization of soft interface
775 * @dev: registered network device to modify
777 * Return: error code on failures
779 static int batadv_softif_init_late(struct net_device
*dev
)
781 struct batadv_priv
*bat_priv
;
784 size_t cnt_len
= sizeof(u64
) * BATADV_CNT_NUM
;
786 batadv_set_lockdep_class(dev
);
788 bat_priv
= netdev_priv(dev
);
789 bat_priv
->soft_iface
= dev
;
791 /* batadv_interface_stats() needs to be available as soon as
792 * register_netdevice() has been called
794 bat_priv
->bat_counters
= __alloc_percpu(cnt_len
, __alignof__(u64
));
795 if (!bat_priv
->bat_counters
)
798 atomic_set(&bat_priv
->aggregated_ogms
, 1);
799 atomic_set(&bat_priv
->bonding
, 0);
800 #ifdef CONFIG_BATMAN_ADV_BLA
801 atomic_set(&bat_priv
->bridge_loop_avoidance
, 1);
803 #ifdef CONFIG_BATMAN_ADV_DAT
804 atomic_set(&bat_priv
->distributed_arp_table
, 1);
806 #ifdef CONFIG_BATMAN_ADV_MCAST
807 atomic_set(&bat_priv
->multicast_mode
, 1);
808 atomic_set(&bat_priv
->multicast_fanout
, 16);
809 atomic_set(&bat_priv
->mcast
.num_want_all_unsnoopables
, 0);
810 atomic_set(&bat_priv
->mcast
.num_want_all_ipv4
, 0);
811 atomic_set(&bat_priv
->mcast
.num_want_all_ipv6
, 0);
813 atomic_set(&bat_priv
->gw
.mode
, BATADV_GW_MODE_OFF
);
814 atomic_set(&bat_priv
->gw
.bandwidth_down
, 100);
815 atomic_set(&bat_priv
->gw
.bandwidth_up
, 20);
816 atomic_set(&bat_priv
->orig_interval
, 1000);
817 atomic_set(&bat_priv
->hop_penalty
, 30);
818 #ifdef CONFIG_BATMAN_ADV_DEBUG
819 atomic_set(&bat_priv
->log_level
, 0);
821 atomic_set(&bat_priv
->fragmentation
, 1);
822 atomic_set(&bat_priv
->packet_size_max
, ETH_DATA_LEN
);
823 atomic_set(&bat_priv
->bcast_queue_left
, BATADV_BCAST_QUEUE_LEN
);
824 atomic_set(&bat_priv
->batman_queue_left
, BATADV_BATMAN_QUEUE_LEN
);
826 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
827 atomic_set(&bat_priv
->bcast_seqno
, 1);
828 atomic_set(&bat_priv
->tt
.vn
, 0);
829 atomic_set(&bat_priv
->tt
.local_changes
, 0);
830 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, 0);
831 #ifdef CONFIG_BATMAN_ADV_BLA
832 atomic_set(&bat_priv
->bla
.num_requests
, 0);
834 atomic_set(&bat_priv
->tp_num
, 0);
836 bat_priv
->tt
.last_changeset
= NULL
;
837 bat_priv
->tt
.last_changeset_len
= 0;
838 bat_priv
->isolation_mark
= 0;
839 bat_priv
->isolation_mark_mask
= 0;
841 /* randomize initial seqno to avoid collision */
842 get_random_bytes(&random_seqno
, sizeof(random_seqno
));
843 atomic_set(&bat_priv
->frag_seqno
, random_seqno
);
845 bat_priv
->primary_if
= NULL
;
847 batadv_nc_init_bat_priv(bat_priv
);
849 ret
= batadv_algo_select(bat_priv
, batadv_routing_algo
);
851 goto free_bat_counters
;
853 ret
= batadv_debugfs_add_meshif(dev
);
855 goto free_bat_counters
;
857 ret
= batadv_mesh_init(dev
);
864 batadv_debugfs_del_meshif(dev
);
866 free_percpu(bat_priv
->bat_counters
);
867 bat_priv
->bat_counters
= NULL
;
873 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
874 * @dev: batadv_soft_interface used as master interface
875 * @slave_dev: net_device which should become the slave interface
876 * @extack: extended ACK report struct
878 * Return: 0 if successful or error otherwise.
880 static int batadv_softif_slave_add(struct net_device
*dev
,
881 struct net_device
*slave_dev
,
882 struct netlink_ext_ack
*extack
)
884 struct batadv_hard_iface
*hard_iface
;
885 struct net
*net
= dev_net(dev
);
888 hard_iface
= batadv_hardif_get_by_netdev(slave_dev
);
889 if (!hard_iface
|| hard_iface
->soft_iface
)
892 ret
= batadv_hardif_enable_interface(hard_iface
, net
, dev
->name
);
896 batadv_hardif_put(hard_iface
);
901 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
902 * @dev: batadv_soft_interface used as master interface
903 * @slave_dev: net_device which should be removed from the master interface
905 * Return: 0 if successful or error otherwise.
907 static int batadv_softif_slave_del(struct net_device
*dev
,
908 struct net_device
*slave_dev
)
910 struct batadv_hard_iface
*hard_iface
;
913 hard_iface
= batadv_hardif_get_by_netdev(slave_dev
);
915 if (!hard_iface
|| hard_iface
->soft_iface
!= dev
)
918 batadv_hardif_disable_interface(hard_iface
, BATADV_IF_CLEANUP_KEEP
);
923 batadv_hardif_put(hard_iface
);
927 static const struct net_device_ops batadv_netdev_ops
= {
928 .ndo_init
= batadv_softif_init_late
,
929 .ndo_open
= batadv_interface_open
,
930 .ndo_stop
= batadv_interface_release
,
931 .ndo_get_stats
= batadv_interface_stats
,
932 .ndo_vlan_rx_add_vid
= batadv_interface_add_vid
,
933 .ndo_vlan_rx_kill_vid
= batadv_interface_kill_vid
,
934 .ndo_set_mac_address
= batadv_interface_set_mac_addr
,
935 .ndo_change_mtu
= batadv_interface_change_mtu
,
936 .ndo_set_rx_mode
= batadv_interface_set_rx_mode
,
937 .ndo_start_xmit
= batadv_interface_tx
,
938 .ndo_validate_addr
= eth_validate_addr
,
939 .ndo_add_slave
= batadv_softif_slave_add
,
940 .ndo_del_slave
= batadv_softif_slave_del
,
943 static void batadv_get_drvinfo(struct net_device
*dev
,
944 struct ethtool_drvinfo
*info
)
946 strscpy(info
->driver
, "B.A.T.M.A.N. advanced", sizeof(info
->driver
));
947 strscpy(info
->version
, BATADV_SOURCE_VERSION
, sizeof(info
->version
));
948 strscpy(info
->fw_version
, "N/A", sizeof(info
->fw_version
));
949 strscpy(info
->bus_info
, "batman", sizeof(info
->bus_info
));
952 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
953 * Declare each description string in struct.name[] to get fixed sized buffer
954 * and compile time checking for strings longer than ETH_GSTRING_LEN.
956 static const struct {
957 const char name
[ETH_GSTRING_LEN
];
958 } batadv_counters_strings
[] = {
975 { "frag_fwd_bytes" },
978 { "tt_response_tx" },
979 { "tt_response_rx" },
980 { "tt_roam_adv_tx" },
981 { "tt_roam_adv_rx" },
982 #ifdef CONFIG_BATMAN_ADV_DAT
987 { "dat_cached_reply_tx" },
989 #ifdef CONFIG_BATMAN_ADV_NC
993 { "nc_recode_bytes" },
996 { "nc_decode_bytes" },
997 { "nc_decode_failed" },
1002 static void batadv_get_strings(struct net_device
*dev
, u32 stringset
, u8
*data
)
1004 if (stringset
== ETH_SS_STATS
)
1005 memcpy(data
, batadv_counters_strings
,
1006 sizeof(batadv_counters_strings
));
1009 static void batadv_get_ethtool_stats(struct net_device
*dev
,
1010 struct ethtool_stats
*stats
, u64
*data
)
1012 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
1015 for (i
= 0; i
< BATADV_CNT_NUM
; i
++)
1016 data
[i
] = batadv_sum_counter(bat_priv
, i
);
1019 static int batadv_get_sset_count(struct net_device
*dev
, int stringset
)
1021 if (stringset
== ETH_SS_STATS
)
1022 return BATADV_CNT_NUM
;
1027 static const struct ethtool_ops batadv_ethtool_ops
= {
1028 .get_drvinfo
= batadv_get_drvinfo
,
1029 .get_link
= ethtool_op_get_link
,
1030 .get_strings
= batadv_get_strings
,
1031 .get_ethtool_stats
= batadv_get_ethtool_stats
,
1032 .get_sset_count
= batadv_get_sset_count
,
1036 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1037 * @dev: Device to cleanup and remove
1039 static void batadv_softif_free(struct net_device
*dev
)
1041 batadv_debugfs_del_meshif(dev
);
1042 batadv_mesh_free(dev
);
1044 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1045 * their tasks. Wait for them all to be finished before freeing the
1046 * netdev and its private data (bat_priv)
1052 * batadv_softif_init_early() - early stage initialization of soft interface
1053 * @dev: registered network device to modify
1055 static void batadv_softif_init_early(struct net_device
*dev
)
1059 dev
->netdev_ops
= &batadv_netdev_ops
;
1060 dev
->needs_free_netdev
= true;
1061 dev
->priv_destructor
= batadv_softif_free
;
1062 dev
->features
|= NETIF_F_HW_VLAN_CTAG_FILTER
| NETIF_F_NETNS_LOCAL
;
1063 dev
->features
|= NETIF_F_LLTX
;
1064 dev
->priv_flags
|= IFF_NO_QUEUE
;
1066 /* can't call min_mtu, because the needed variables
1067 * have not been initialized yet
1069 dev
->mtu
= ETH_DATA_LEN
;
1071 /* generate random address */
1072 eth_hw_addr_random(dev
);
1074 dev
->ethtool_ops
= &batadv_ethtool_ops
;
1078 * batadv_softif_create() - Create and register soft interface
1079 * @net: the applicable net namespace
1080 * @name: name of the new soft interface
1082 * Return: newly allocated soft_interface, NULL on errors
1084 struct net_device
*batadv_softif_create(struct net
*net
, const char *name
)
1086 struct net_device
*soft_iface
;
1089 soft_iface
= alloc_netdev(sizeof(struct batadv_priv
), name
,
1090 NET_NAME_UNKNOWN
, batadv_softif_init_early
);
1094 dev_net_set(soft_iface
, net
);
1096 soft_iface
->rtnl_link_ops
= &batadv_link_ops
;
1098 ret
= register_netdevice(soft_iface
);
1100 pr_err("Unable to register the batman interface '%s': %i\n",
1102 free_netdev(soft_iface
);
1110 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1111 * @soft_iface: the to-be-removed batman-adv interface
1113 void batadv_softif_destroy_sysfs(struct net_device
*soft_iface
)
1115 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
1116 struct batadv_softif_vlan
*vlan
;
1120 /* destroy the "untagged" VLAN */
1121 vlan
= batadv_softif_vlan_get(bat_priv
, BATADV_NO_FLAGS
);
1123 batadv_softif_destroy_vlan(bat_priv
, vlan
);
1124 batadv_softif_vlan_put(vlan
);
1127 batadv_sysfs_del_meshif(soft_iface
);
1128 unregister_netdevice(soft_iface
);
1132 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1134 * @soft_iface: the to-be-removed batman-adv interface
1135 * @head: list pointer
1137 static void batadv_softif_destroy_netlink(struct net_device
*soft_iface
,
1138 struct list_head
*head
)
1140 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
1141 struct batadv_hard_iface
*hard_iface
;
1142 struct batadv_softif_vlan
*vlan
;
1144 list_for_each_entry(hard_iface
, &batadv_hardif_list
, list
) {
1145 if (hard_iface
->soft_iface
== soft_iface
)
1146 batadv_hardif_disable_interface(hard_iface
,
1147 BATADV_IF_CLEANUP_KEEP
);
1150 /* destroy the "untagged" VLAN */
1151 vlan
= batadv_softif_vlan_get(bat_priv
, BATADV_NO_FLAGS
);
1153 batadv_softif_destroy_vlan(bat_priv
, vlan
);
1154 batadv_softif_vlan_put(vlan
);
1157 batadv_sysfs_del_meshif(soft_iface
);
1158 unregister_netdevice_queue(soft_iface
, head
);
1162 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1163 * @net_dev: device which should be checked
1165 * Return: true when net_dev is a batman-adv interface, false otherwise
1167 bool batadv_softif_is_valid(const struct net_device
*net_dev
)
1169 if (net_dev
->netdev_ops
->ndo_start_xmit
== batadv_interface_tx
)
1175 struct rtnl_link_ops batadv_link_ops __read_mostly
= {
1177 .priv_size
= sizeof(struct batadv_priv
),
1178 .setup
= batadv_softif_init_early
,
1179 .dellink
= batadv_softif_destroy_netlink
,