1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 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/random.h>
30 #include <linux/rculist.h>
31 #include <linux/rcupdate.h>
32 #include <linux/skbuff.h>
33 #include <linux/slab.h>
34 #include <linux/socket.h>
35 #include <linux/spinlock.h>
36 #include <linux/stddef.h>
37 #include <linux/string.h>
38 #include <linux/types.h>
39 #include <net/net_namespace.h>
40 #include <net/netlink.h>
41 #include <uapi/linux/batadv_packet.h>
42 #include <uapi/linux/batman_adv.h>
45 #include "bridge_loop_avoidance.h"
46 #include "distributed-arp-table.h"
47 #include "gateway_client.h"
48 #include "hard-interface.h"
49 #include "multicast.h"
50 #include "network-coding.h"
51 #include "originator.h"
53 #include "translation-table.h"
56 * batadv_skb_head_push() - Increase header size and move (push) head pointer
57 * @skb: packet buffer which should be modified
58 * @len: number of bytes to add
60 * Return: 0 on success or negative error number in case of failure
62 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
66 /* TODO: We must check if we can release all references to non-payload
67 * data using __skb_header_release in our skbs to allow skb_cow_header
68 * to work optimally. This means that those skbs are not allowed to read
69 * or write any data which is before the current position of skb->data
70 * after that call and thus allow other skbs with the same data buffer
71 * to write freely in that area.
73 result = skb_cow_head(skb, len);
81 static int batadv_interface_open(struct net_device *dev)
83 netif_start_queue(dev);
87 static int batadv_interface_release(struct net_device *dev)
89 netif_stop_queue(dev);
94 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
95 * @bat_priv: the bat priv with all the soft interface information
96 * @idx: index of counter to sum up
98 * Return: sum of all cpu-local counters
100 static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
102 u64 *counters, sum = 0;
105 for_each_possible_cpu(cpu) {
106 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
107 sum += counters[idx];
113 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
115 struct batadv_priv *bat_priv = netdev_priv(dev);
116 struct net_device_stats *stats = &dev->stats;
118 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
119 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
120 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
121 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
122 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
126 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
128 struct batadv_priv *bat_priv = netdev_priv(dev);
129 struct batadv_softif_vlan *vlan;
130 struct sockaddr *addr = p;
131 u8 old_addr[ETH_ALEN];
133 if (!is_valid_ether_addr(addr->sa_data))
134 return -EADDRNOTAVAIL;
136 ether_addr_copy(old_addr, dev->dev_addr);
137 ether_addr_copy(dev->dev_addr, addr->sa_data);
139 /* only modify transtable if it has been initialized before */
140 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
144 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
145 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
146 "mac address changed", false);
147 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
148 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
155 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
158 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
167 * batadv_interface_set_rx_mode() - set the rx mode of a device
168 * @dev: registered network device to modify
170 * We do not actually need to set any rx filters for the virtual batman
171 * soft interface. However a dummy handler enables a user to set static
172 * multicast listeners for instance.
174 static void batadv_interface_set_rx_mode(struct net_device *dev)
178 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
179 struct net_device *soft_iface)
181 struct ethhdr *ethhdr;
182 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
183 struct batadv_hard_iface *primary_if = NULL;
184 struct batadv_bcast_packet *bcast_packet;
185 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
187 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
189 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
190 u8 *dst_hint = NULL, chaddr[ETH_ALEN];
191 struct vlan_ethhdr *vhdr;
192 unsigned int header_len = 0;
193 int data_len = skb->len, ret;
194 unsigned long brd_delay = 0;
195 bool do_bcast = false, client_added;
199 enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
200 struct batadv_orig_node *mcast_single_orig = NULL;
201 int network_offset = ETH_HLEN;
204 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
207 /* reset control block to avoid left overs from previous users */
208 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
210 netif_trans_update(soft_iface);
211 vid = batadv_get_vid(skb, 0);
213 skb_reset_mac_header(skb);
214 ethhdr = eth_hdr(skb);
216 proto = ethhdr->h_proto;
218 switch (ntohs(proto)) {
220 if (!pskb_may_pull(skb, sizeof(*vhdr)))
222 vhdr = vlan_eth_hdr(skb);
223 proto = vhdr->h_vlan_encapsulated_proto;
225 /* drop batman-in-batman packets to prevent loops */
226 if (proto != htons(ETH_P_BATMAN)) {
227 network_offset += VLAN_HLEN;
236 skb_set_network_header(skb, network_offset);
238 if (batadv_bla_tx(bat_priv, skb, vid))
241 /* skb->data might have been reallocated by batadv_bla_tx() */
242 ethhdr = eth_hdr(skb);
244 /* Register the client MAC in the transtable */
245 if (!is_multicast_ether_addr(ethhdr->h_source) &&
246 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
247 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
254 /* Snoop address candidates from DHCPACKs for early DAT filling */
255 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
257 /* don't accept stp packets. STP does not help in meshes.
258 * better use the bridge loop avoidance ...
260 * The same goes for ECTP sent at least by some Cisco Switches,
261 * it might confuse the mesh when used with bridge loop avoidance.
263 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
266 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
269 gw_mode = atomic_read(&bat_priv->gw.mode);
270 if (is_multicast_ether_addr(ethhdr->h_dest)) {
271 /* if gw mode is off, broadcast every packet */
272 if (gw_mode == BATADV_GW_MODE_OFF) {
277 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
279 /* skb->data may have been modified by
280 * batadv_gw_dhcp_recipient_get()
282 ethhdr = eth_hdr(skb);
283 /* if gw_mode is on, broadcast any non-DHCP message.
284 * All the DHCP packets are going to be sent as unicast
286 if (dhcp_rcp == BATADV_DHCP_NO) {
291 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
293 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
294 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
295 /* gateways should not forward any DHCP message if
296 * directed to a DHCP server
301 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
302 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
304 if (forw_mode == BATADV_FORW_NONE)
307 if (forw_mode == BATADV_FORW_SINGLE ||
308 forw_mode == BATADV_FORW_SOME)
313 batadv_skb_set_priority(skb, 0);
315 /* ethernet packet should be broadcasted */
317 primary_if = batadv_primary_if_get_selected(bat_priv);
321 /* in case of ARP request, we do not immediately broadcasti the
322 * packet, instead we first wait for DAT to try to retrieve the
325 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
326 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
328 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
331 bcast_packet = (struct batadv_bcast_packet *)skb->data;
332 bcast_packet->version = BATADV_COMPAT_VERSION;
333 bcast_packet->ttl = BATADV_TTL - 1;
335 /* batman packet type: broadcast */
336 bcast_packet->packet_type = BATADV_BCAST;
337 bcast_packet->reserved = 0;
339 /* hw address of first interface is the orig mac because only
340 * this mac is known throughout the mesh
342 ether_addr_copy(bcast_packet->orig,
343 primary_if->net_dev->dev_addr);
345 /* set broadcast sequence number */
346 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
347 bcast_packet->seqno = htonl(seqno);
349 batadv_send_bcast_packet(bat_priv, skb, brd_delay, true);
352 /* DHCP packets going to a server will use the GW feature */
353 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
354 ret = batadv_gw_out_of_range(bat_priv, skb);
357 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
358 } else if (mcast_single_orig) {
359 ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
361 } else if (forw_mode == BATADV_FORW_SOME) {
362 ret = batadv_mcast_forw_send(bat_priv, skb, vid);
364 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
368 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
370 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
373 if (ret != NET_XMIT_SUCCESS)
377 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
378 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
384 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
386 batadv_orig_node_put(mcast_single_orig);
387 batadv_hardif_put(primary_if);
392 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
393 * @soft_iface: local interface which will receive the ethernet frame
394 * @skb: ethernet frame for @soft_iface
395 * @hdr_size: size of already parsed batman-adv header
396 * @orig_node: originator from which the batman-adv packet was sent
398 * Sends an ethernet frame to the receive path of the local @soft_iface.
399 * skb->data has still point to the batman-adv header with the size @hdr_size.
400 * The caller has to have parsed this header already and made sure that at least
401 * @hdr_size bytes are still available for pull in @skb.
403 * The packet may still get dropped. This can happen when the encapsulated
404 * ethernet frame is invalid or contains again an batman-adv packet. Also
405 * unicast packets will be dropped directly when it was sent between two
408 void batadv_interface_rx(struct net_device *soft_iface,
409 struct sk_buff *skb, int hdr_size,
410 struct batadv_orig_node *orig_node)
412 struct batadv_bcast_packet *batadv_bcast_packet;
413 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
414 struct vlan_ethhdr *vhdr;
415 struct ethhdr *ethhdr;
419 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
420 packet_type = batadv_bcast_packet->packet_type;
422 skb_pull_rcsum(skb, hdr_size);
423 skb_reset_mac_header(skb);
425 /* clean the netfilter state now that the batman-adv header has been
430 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
433 vid = batadv_get_vid(skb, 0);
434 ethhdr = eth_hdr(skb);
436 switch (ntohs(ethhdr->h_proto)) {
438 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
441 vhdr = (struct vlan_ethhdr *)skb->data;
443 /* drop batman-in-batman packets to prevent loops */
444 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
452 /* skb->dev & skb->pkt_type are set here */
453 skb->protocol = eth_type_trans(skb, soft_iface);
454 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
456 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
457 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
458 skb->len + ETH_HLEN);
460 /* Let the bridge loop avoidance check the packet. If will
461 * not handle it, we can safely push it up.
463 if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
467 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
468 ethhdr->h_source, vid);
470 if (is_multicast_ether_addr(ethhdr->h_dest)) {
471 /* set the mark on broadcast packets if AP isolation is ON and
472 * the packet is coming from an "isolated" client
474 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
475 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
477 /* save bits in skb->mark not covered by the mask and
478 * apply the mark on the rest
480 skb->mark &= ~bat_priv->isolation_mark_mask;
481 skb->mark |= bat_priv->isolation_mark;
483 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
484 ethhdr->h_dest, vid)) {
498 * batadv_softif_vlan_release() - release vlan from lists and queue for free
499 * after rcu grace period
500 * @ref: kref pointer of the vlan object
502 void batadv_softif_vlan_release(struct kref *ref)
504 struct batadv_softif_vlan *vlan;
506 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
508 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
509 hlist_del_rcu(&vlan->list);
510 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
512 kfree_rcu(vlan, rcu);
516 * batadv_softif_vlan_get() - get the vlan object for a specific vid
517 * @bat_priv: the bat priv with all the soft interface information
518 * @vid: the identifier of the vlan object to retrieve
520 * Return: the private data of the vlan matching the vid passed as argument or
521 * NULL otherwise. The refcounter of the returned object is incremented by 1.
523 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
526 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
529 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
530 if (vlan_tmp->vid != vid)
533 if (!kref_get_unless_zero(&vlan_tmp->refcount))
545 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
546 * @bat_priv: the bat priv with all the soft interface information
547 * @vid: the VLAN identifier
549 * Return: 0 on success, a negative error otherwise.
551 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
553 struct batadv_softif_vlan *vlan;
555 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
557 vlan = batadv_softif_vlan_get(bat_priv, vid);
559 batadv_softif_vlan_put(vlan);
560 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
564 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
566 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
570 vlan->bat_priv = bat_priv;
572 kref_init(&vlan->refcount);
574 atomic_set(&vlan->ap_isolation, 0);
576 kref_get(&vlan->refcount);
577 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
578 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
580 /* add a new TT local entry. This one will be marked with the NOPURGE
583 batadv_tt_local_add(bat_priv->soft_iface,
584 bat_priv->soft_iface->dev_addr, vid,
585 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
587 /* don't return reference to new softif_vlan */
588 batadv_softif_vlan_put(vlan);
594 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
595 * @bat_priv: the bat priv with all the soft interface information
596 * @vlan: the object to remove
598 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
599 struct batadv_softif_vlan *vlan)
601 /* explicitly remove the associated TT local entry because it is marked
602 * with the NOPURGE flag
604 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
605 vlan->vid, "vlan interface destroyed", false);
607 batadv_softif_vlan_put(vlan);
611 * batadv_interface_add_vid() - ndo_add_vid API implementation
612 * @dev: the netdev of the mesh interface
613 * @proto: protocol of the vlan id
614 * @vid: identifier of the new vlan
616 * Set up all the internal structures for handling the new vlan on top of the
619 * Return: 0 on success or a negative error code in case of failure.
621 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
624 struct batadv_priv *bat_priv = netdev_priv(dev);
625 struct batadv_softif_vlan *vlan;
627 /* only 802.1Q vlans are supported.
628 * batman-adv does not know how to handle other types
630 if (proto != htons(ETH_P_8021Q))
633 vid |= BATADV_VLAN_HAS_TAG;
635 /* if a new vlan is getting created and it already exists, it means that
636 * it was not deleted yet. batadv_softif_vlan_get() increases the
637 * refcount in order to revive the object.
639 * if it does not exist then create it.
641 vlan = batadv_softif_vlan_get(bat_priv, vid);
643 return batadv_softif_create_vlan(bat_priv, vid);
645 /* add a new TT local entry. This one will be marked with the NOPURGE
646 * flag. This must be added again, even if the vlan object already
647 * exists, because the entry was deleted by kill_vid()
649 batadv_tt_local_add(bat_priv->soft_iface,
650 bat_priv->soft_iface->dev_addr, vid,
651 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
657 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
658 * @dev: the netdev of the mesh interface
659 * @proto: protocol of the vlan id
660 * @vid: identifier of the deleted vlan
662 * Destroy all the internal structures used to handle the vlan identified by vid
663 * on top of the mesh interface
665 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
666 * or -ENOENT if the specified vlan id wasn't registered.
668 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
671 struct batadv_priv *bat_priv = netdev_priv(dev);
672 struct batadv_softif_vlan *vlan;
674 /* only 802.1Q vlans are supported. batman-adv does not know how to
677 if (proto != htons(ETH_P_8021Q))
680 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
684 batadv_softif_destroy_vlan(bat_priv, vlan);
686 /* finally free the vlan object */
687 batadv_softif_vlan_put(vlan);
692 /* batman-adv network devices have devices nesting below it and are a special
693 * "super class" of normal network devices; split their locks off into a
694 * separate class since they always nest.
696 static struct lock_class_key batadv_netdev_xmit_lock_key;
697 static struct lock_class_key batadv_netdev_addr_lock_key;
700 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
701 * @dev: device which owns the tx queue
702 * @txq: tx queue to modify
703 * @_unused: always NULL
705 static void batadv_set_lockdep_class_one(struct net_device *dev,
706 struct netdev_queue *txq,
709 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
713 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
714 * @dev: network device to modify
716 static void batadv_set_lockdep_class(struct net_device *dev)
718 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
719 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
723 * batadv_softif_init_late() - late stage initialization of soft interface
724 * @dev: registered network device to modify
726 * Return: error code on failures
728 static int batadv_softif_init_late(struct net_device *dev)
730 struct batadv_priv *bat_priv;
733 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
735 batadv_set_lockdep_class(dev);
737 bat_priv = netdev_priv(dev);
738 bat_priv->soft_iface = dev;
740 /* batadv_interface_stats() needs to be available as soon as
741 * register_netdevice() has been called
743 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
744 if (!bat_priv->bat_counters)
747 atomic_set(&bat_priv->aggregated_ogms, 1);
748 atomic_set(&bat_priv->bonding, 0);
749 #ifdef CONFIG_BATMAN_ADV_BLA
750 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
752 #ifdef CONFIG_BATMAN_ADV_DAT
753 atomic_set(&bat_priv->distributed_arp_table, 1);
755 #ifdef CONFIG_BATMAN_ADV_MCAST
756 atomic_set(&bat_priv->multicast_mode, 1);
757 atomic_set(&bat_priv->multicast_fanout, 16);
758 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
759 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
760 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
762 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
763 atomic_set(&bat_priv->gw.bandwidth_down, 100);
764 atomic_set(&bat_priv->gw.bandwidth_up, 20);
765 atomic_set(&bat_priv->orig_interval, 1000);
766 atomic_set(&bat_priv->hop_penalty, 30);
767 #ifdef CONFIG_BATMAN_ADV_DEBUG
768 atomic_set(&bat_priv->log_level, 0);
770 atomic_set(&bat_priv->fragmentation, 1);
771 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
772 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
773 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
775 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
776 atomic_set(&bat_priv->bcast_seqno, 1);
777 atomic_set(&bat_priv->tt.vn, 0);
778 atomic_set(&bat_priv->tt.local_changes, 0);
779 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
780 #ifdef CONFIG_BATMAN_ADV_BLA
781 atomic_set(&bat_priv->bla.num_requests, 0);
783 atomic_set(&bat_priv->tp_num, 0);
785 bat_priv->tt.last_changeset = NULL;
786 bat_priv->tt.last_changeset_len = 0;
787 bat_priv->isolation_mark = 0;
788 bat_priv->isolation_mark_mask = 0;
790 /* randomize initial seqno to avoid collision */
791 get_random_bytes(&random_seqno, sizeof(random_seqno));
792 atomic_set(&bat_priv->frag_seqno, random_seqno);
794 bat_priv->primary_if = NULL;
796 batadv_nc_init_bat_priv(bat_priv);
798 if (!bat_priv->algo_ops) {
799 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
801 goto free_bat_counters;
804 ret = batadv_mesh_init(dev);
806 goto free_bat_counters;
811 free_percpu(bat_priv->bat_counters);
812 bat_priv->bat_counters = NULL;
818 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
819 * @dev: batadv_soft_interface used as master interface
820 * @slave_dev: net_device which should become the slave interface
821 * @extack: extended ACK report struct
823 * Return: 0 if successful or error otherwise.
825 static int batadv_softif_slave_add(struct net_device *dev,
826 struct net_device *slave_dev,
827 struct netlink_ext_ack *extack)
829 struct batadv_hard_iface *hard_iface;
832 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
833 if (!hard_iface || hard_iface->soft_iface)
836 ret = batadv_hardif_enable_interface(hard_iface, dev);
839 batadv_hardif_put(hard_iface);
844 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
845 * @dev: batadv_soft_interface used as master interface
846 * @slave_dev: net_device which should be removed from the master interface
848 * Return: 0 if successful or error otherwise.
850 static int batadv_softif_slave_del(struct net_device *dev,
851 struct net_device *slave_dev)
853 struct batadv_hard_iface *hard_iface;
856 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
858 if (!hard_iface || hard_iface->soft_iface != dev)
861 batadv_hardif_disable_interface(hard_iface);
865 batadv_hardif_put(hard_iface);
869 static const struct net_device_ops batadv_netdev_ops = {
870 .ndo_init = batadv_softif_init_late,
871 .ndo_open = batadv_interface_open,
872 .ndo_stop = batadv_interface_release,
873 .ndo_get_stats = batadv_interface_stats,
874 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
875 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
876 .ndo_set_mac_address = batadv_interface_set_mac_addr,
877 .ndo_change_mtu = batadv_interface_change_mtu,
878 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
879 .ndo_start_xmit = batadv_interface_tx,
880 .ndo_validate_addr = eth_validate_addr,
881 .ndo_add_slave = batadv_softif_slave_add,
882 .ndo_del_slave = batadv_softif_slave_del,
885 static void batadv_get_drvinfo(struct net_device *dev,
886 struct ethtool_drvinfo *info)
888 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
889 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
890 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
891 strscpy(info->bus_info, "batman", sizeof(info->bus_info));
894 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
895 * Declare each description string in struct.name[] to get fixed sized buffer
896 * and compile time checking for strings longer than ETH_GSTRING_LEN.
898 static const struct {
899 const char name[ETH_GSTRING_LEN];
900 } batadv_counters_strings[] = {
917 { "frag_fwd_bytes" },
920 { "tt_response_tx" },
921 { "tt_response_rx" },
922 { "tt_roam_adv_tx" },
923 { "tt_roam_adv_rx" },
924 #ifdef CONFIG_BATMAN_ADV_DAT
929 { "dat_cached_reply_tx" },
931 #ifdef CONFIG_BATMAN_ADV_NC
935 { "nc_recode_bytes" },
938 { "nc_decode_bytes" },
939 { "nc_decode_failed" },
944 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
946 if (stringset == ETH_SS_STATS)
947 memcpy(data, batadv_counters_strings,
948 sizeof(batadv_counters_strings));
951 static void batadv_get_ethtool_stats(struct net_device *dev,
952 struct ethtool_stats *stats, u64 *data)
954 struct batadv_priv *bat_priv = netdev_priv(dev);
957 for (i = 0; i < BATADV_CNT_NUM; i++)
958 data[i] = batadv_sum_counter(bat_priv, i);
961 static int batadv_get_sset_count(struct net_device *dev, int stringset)
963 if (stringset == ETH_SS_STATS)
964 return BATADV_CNT_NUM;
969 static const struct ethtool_ops batadv_ethtool_ops = {
970 .get_drvinfo = batadv_get_drvinfo,
971 .get_link = ethtool_op_get_link,
972 .get_strings = batadv_get_strings,
973 .get_ethtool_stats = batadv_get_ethtool_stats,
974 .get_sset_count = batadv_get_sset_count,
978 * batadv_softif_free() - Deconstructor of batadv_soft_interface
979 * @dev: Device to cleanup and remove
981 static void batadv_softif_free(struct net_device *dev)
983 batadv_mesh_free(dev);
985 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
986 * their tasks. Wait for them all to be finished before freeing the
987 * netdev and its private data (bat_priv)
993 * batadv_softif_init_early() - early stage initialization of soft interface
994 * @dev: registered network device to modify
996 static void batadv_softif_init_early(struct net_device *dev)
1000 dev->netdev_ops = &batadv_netdev_ops;
1001 dev->needs_free_netdev = true;
1002 dev->priv_destructor = batadv_softif_free;
1003 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1004 dev->features |= NETIF_F_LLTX;
1005 dev->priv_flags |= IFF_NO_QUEUE;
1007 /* can't call min_mtu, because the needed variables
1008 * have not been initialized yet
1010 dev->mtu = ETH_DATA_LEN;
1012 /* generate random address */
1013 eth_hw_addr_random(dev);
1015 dev->ethtool_ops = &batadv_ethtool_ops;
1019 * batadv_softif_validate() - validate configuration of new batadv link
1020 * @tb: IFLA_INFO_DATA netlink attributes
1021 * @data: enum batadv_ifla_attrs attributes
1022 * @extack: extended ACK report struct
1024 * Return: 0 if successful or error otherwise.
1026 static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[],
1027 struct netlink_ext_ack *extack)
1029 struct batadv_algo_ops *algo_ops;
1034 if (data[IFLA_BATADV_ALGO_NAME]) {
1035 algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME]));
1044 * batadv_softif_newlink() - pre-initialize and register new batadv link
1045 * @src_net: the applicable net namespace
1046 * @dev: network device to register
1047 * @tb: IFLA_INFO_DATA netlink attributes
1048 * @data: enum batadv_ifla_attrs attributes
1049 * @extack: extended ACK report struct
1051 * Return: 0 if successful or error otherwise.
1053 static int batadv_softif_newlink(struct net *src_net, struct net_device *dev,
1054 struct nlattr *tb[], struct nlattr *data[],
1055 struct netlink_ext_ack *extack)
1057 struct batadv_priv *bat_priv = netdev_priv(dev);
1058 const char *algo_name;
1061 if (data && data[IFLA_BATADV_ALGO_NAME]) {
1062 algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]);
1063 err = batadv_algo_select(bat_priv, algo_name);
1068 return register_netdevice(dev);
1072 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1074 * @soft_iface: the to-be-removed batman-adv interface
1075 * @head: list pointer
1077 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1078 struct list_head *head)
1080 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1081 struct batadv_hard_iface *hard_iface;
1082 struct batadv_softif_vlan *vlan;
1084 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1085 if (hard_iface->soft_iface == soft_iface)
1086 batadv_hardif_disable_interface(hard_iface);
1089 /* destroy the "untagged" VLAN */
1090 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1092 batadv_softif_destroy_vlan(bat_priv, vlan);
1093 batadv_softif_vlan_put(vlan);
1096 unregister_netdevice_queue(soft_iface, head);
1100 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1101 * @net_dev: device which should be checked
1103 * Return: true when net_dev is a batman-adv interface, false otherwise
1105 bool batadv_softif_is_valid(const struct net_device *net_dev)
1107 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1113 static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1114 [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1117 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1119 .priv_size = sizeof(struct batadv_priv),
1120 .setup = batadv_softif_init_early,
1121 .maxtype = IFLA_BATADV_MAX,
1122 .policy = batadv_ifla_policy,
1123 .validate = batadv_softif_validate,
1124 .newlink = batadv_softif_newlink,
1125 .dellink = batadv_softif_destroy_netlink,