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 if (mcast_single_orig)
387 batadv_orig_node_put(mcast_single_orig);
389 batadv_hardif_put(primary_if);
394 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
395 * @soft_iface: local interface which will receive the ethernet frame
396 * @skb: ethernet frame for @soft_iface
397 * @hdr_size: size of already parsed batman-adv header
398 * @orig_node: originator from which the batman-adv packet was sent
400 * Sends an ethernet frame to the receive path of the local @soft_iface.
401 * skb->data has still point to the batman-adv header with the size @hdr_size.
402 * The caller has to have parsed this header already and made sure that at least
403 * @hdr_size bytes are still available for pull in @skb.
405 * The packet may still get dropped. This can happen when the encapsulated
406 * ethernet frame is invalid or contains again an batman-adv packet. Also
407 * unicast packets will be dropped directly when it was sent between two
410 void batadv_interface_rx(struct net_device *soft_iface,
411 struct sk_buff *skb, int hdr_size,
412 struct batadv_orig_node *orig_node)
414 struct batadv_bcast_packet *batadv_bcast_packet;
415 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
416 struct vlan_ethhdr *vhdr;
417 struct ethhdr *ethhdr;
421 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
422 packet_type = batadv_bcast_packet->packet_type;
424 skb_pull_rcsum(skb, hdr_size);
425 skb_reset_mac_header(skb);
427 /* clean the netfilter state now that the batman-adv header has been
432 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
435 vid = batadv_get_vid(skb, 0);
436 ethhdr = eth_hdr(skb);
438 switch (ntohs(ethhdr->h_proto)) {
440 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
443 vhdr = (struct vlan_ethhdr *)skb->data;
445 /* drop batman-in-batman packets to prevent loops */
446 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
454 /* skb->dev & skb->pkt_type are set here */
455 skb->protocol = eth_type_trans(skb, soft_iface);
456 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
458 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
459 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
460 skb->len + ETH_HLEN);
462 /* Let the bridge loop avoidance check the packet. If will
463 * not handle it, we can safely push it up.
465 if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
469 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
470 ethhdr->h_source, vid);
472 if (is_multicast_ether_addr(ethhdr->h_dest)) {
473 /* set the mark on broadcast packets if AP isolation is ON and
474 * the packet is coming from an "isolated" client
476 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
477 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
479 /* save bits in skb->mark not covered by the mask and
480 * apply the mark on the rest
482 skb->mark &= ~bat_priv->isolation_mark_mask;
483 skb->mark |= bat_priv->isolation_mark;
485 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
486 ethhdr->h_dest, vid)) {
500 * batadv_softif_vlan_release() - release vlan from lists and queue for free
501 * after rcu grace period
502 * @ref: kref pointer of the vlan object
504 void batadv_softif_vlan_release(struct kref *ref)
506 struct batadv_softif_vlan *vlan;
508 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
510 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
511 hlist_del_rcu(&vlan->list);
512 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
514 kfree_rcu(vlan, rcu);
518 * batadv_softif_vlan_get() - get the vlan object for a specific vid
519 * @bat_priv: the bat priv with all the soft interface information
520 * @vid: the identifier of the vlan object to retrieve
522 * Return: the private data of the vlan matching the vid passed as argument or
523 * NULL otherwise. The refcounter of the returned object is incremented by 1.
525 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
528 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
531 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
532 if (vlan_tmp->vid != vid)
535 if (!kref_get_unless_zero(&vlan_tmp->refcount))
547 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
548 * @bat_priv: the bat priv with all the soft interface information
549 * @vid: the VLAN identifier
551 * Return: 0 on success, a negative error otherwise.
553 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
555 struct batadv_softif_vlan *vlan;
557 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
559 vlan = batadv_softif_vlan_get(bat_priv, vid);
561 batadv_softif_vlan_put(vlan);
562 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
566 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
568 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
572 vlan->bat_priv = bat_priv;
574 kref_init(&vlan->refcount);
576 atomic_set(&vlan->ap_isolation, 0);
578 kref_get(&vlan->refcount);
579 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
580 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
582 /* add a new TT local entry. This one will be marked with the NOPURGE
585 batadv_tt_local_add(bat_priv->soft_iface,
586 bat_priv->soft_iface->dev_addr, vid,
587 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
589 /* don't return reference to new softif_vlan */
590 batadv_softif_vlan_put(vlan);
596 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
597 * @bat_priv: the bat priv with all the soft interface information
598 * @vlan: the object to remove
600 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
601 struct batadv_softif_vlan *vlan)
603 /* explicitly remove the associated TT local entry because it is marked
604 * with the NOPURGE flag
606 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
607 vlan->vid, "vlan interface destroyed", false);
609 batadv_softif_vlan_put(vlan);
613 * batadv_interface_add_vid() - ndo_add_vid API implementation
614 * @dev: the netdev of the mesh interface
615 * @proto: protocol of the vlan id
616 * @vid: identifier of the new vlan
618 * Set up all the internal structures for handling the new vlan on top of the
621 * Return: 0 on success or a negative error code in case of failure.
623 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
626 struct batadv_priv *bat_priv = netdev_priv(dev);
627 struct batadv_softif_vlan *vlan;
629 /* only 802.1Q vlans are supported.
630 * batman-adv does not know how to handle other types
632 if (proto != htons(ETH_P_8021Q))
635 vid |= BATADV_VLAN_HAS_TAG;
637 /* if a new vlan is getting created and it already exists, it means that
638 * it was not deleted yet. batadv_softif_vlan_get() increases the
639 * refcount in order to revive the object.
641 * if it does not exist then create it.
643 vlan = batadv_softif_vlan_get(bat_priv, vid);
645 return batadv_softif_create_vlan(bat_priv, vid);
647 /* add a new TT local entry. This one will be marked with the NOPURGE
648 * flag. This must be added again, even if the vlan object already
649 * exists, because the entry was deleted by kill_vid()
651 batadv_tt_local_add(bat_priv->soft_iface,
652 bat_priv->soft_iface->dev_addr, vid,
653 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
659 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
660 * @dev: the netdev of the mesh interface
661 * @proto: protocol of the vlan id
662 * @vid: identifier of the deleted vlan
664 * Destroy all the internal structures used to handle the vlan identified by vid
665 * on top of the mesh interface
667 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
668 * or -ENOENT if the specified vlan id wasn't registered.
670 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
673 struct batadv_priv *bat_priv = netdev_priv(dev);
674 struct batadv_softif_vlan *vlan;
676 /* only 802.1Q vlans are supported. batman-adv does not know how to
679 if (proto != htons(ETH_P_8021Q))
682 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
686 batadv_softif_destroy_vlan(bat_priv, vlan);
688 /* finally free the vlan object */
689 batadv_softif_vlan_put(vlan);
694 /* batman-adv network devices have devices nesting below it and are a special
695 * "super class" of normal network devices; split their locks off into a
696 * separate class since they always nest.
698 static struct lock_class_key batadv_netdev_xmit_lock_key;
699 static struct lock_class_key batadv_netdev_addr_lock_key;
702 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
703 * @dev: device which owns the tx queue
704 * @txq: tx queue to modify
705 * @_unused: always NULL
707 static void batadv_set_lockdep_class_one(struct net_device *dev,
708 struct netdev_queue *txq,
711 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
715 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
716 * @dev: network device to modify
718 static void batadv_set_lockdep_class(struct net_device *dev)
720 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
721 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
725 * batadv_softif_init_late() - late stage initialization of soft interface
726 * @dev: registered network device to modify
728 * Return: error code on failures
730 static int batadv_softif_init_late(struct net_device *dev)
732 struct batadv_priv *bat_priv;
735 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
737 batadv_set_lockdep_class(dev);
739 bat_priv = netdev_priv(dev);
740 bat_priv->soft_iface = dev;
742 /* batadv_interface_stats() needs to be available as soon as
743 * register_netdevice() has been called
745 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
746 if (!bat_priv->bat_counters)
749 atomic_set(&bat_priv->aggregated_ogms, 1);
750 atomic_set(&bat_priv->bonding, 0);
751 #ifdef CONFIG_BATMAN_ADV_BLA
752 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
754 #ifdef CONFIG_BATMAN_ADV_DAT
755 atomic_set(&bat_priv->distributed_arp_table, 1);
757 #ifdef CONFIG_BATMAN_ADV_MCAST
758 atomic_set(&bat_priv->multicast_mode, 1);
759 atomic_set(&bat_priv->multicast_fanout, 16);
760 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
761 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
762 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
764 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
765 atomic_set(&bat_priv->gw.bandwidth_down, 100);
766 atomic_set(&bat_priv->gw.bandwidth_up, 20);
767 atomic_set(&bat_priv->orig_interval, 1000);
768 atomic_set(&bat_priv->hop_penalty, 30);
769 #ifdef CONFIG_BATMAN_ADV_DEBUG
770 atomic_set(&bat_priv->log_level, 0);
772 atomic_set(&bat_priv->fragmentation, 1);
773 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
774 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
775 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
777 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
778 atomic_set(&bat_priv->bcast_seqno, 1);
779 atomic_set(&bat_priv->tt.vn, 0);
780 atomic_set(&bat_priv->tt.local_changes, 0);
781 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
782 #ifdef CONFIG_BATMAN_ADV_BLA
783 atomic_set(&bat_priv->bla.num_requests, 0);
785 atomic_set(&bat_priv->tp_num, 0);
787 bat_priv->tt.last_changeset = NULL;
788 bat_priv->tt.last_changeset_len = 0;
789 bat_priv->isolation_mark = 0;
790 bat_priv->isolation_mark_mask = 0;
792 /* randomize initial seqno to avoid collision */
793 get_random_bytes(&random_seqno, sizeof(random_seqno));
794 atomic_set(&bat_priv->frag_seqno, random_seqno);
796 bat_priv->primary_if = NULL;
798 batadv_nc_init_bat_priv(bat_priv);
800 if (!bat_priv->algo_ops) {
801 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
803 goto free_bat_counters;
806 ret = batadv_mesh_init(dev);
808 goto free_bat_counters;
813 free_percpu(bat_priv->bat_counters);
814 bat_priv->bat_counters = NULL;
820 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
821 * @dev: batadv_soft_interface used as master interface
822 * @slave_dev: net_device which should become the slave interface
823 * @extack: extended ACK report struct
825 * Return: 0 if successful or error otherwise.
827 static int batadv_softif_slave_add(struct net_device *dev,
828 struct net_device *slave_dev,
829 struct netlink_ext_ack *extack)
831 struct batadv_hard_iface *hard_iface;
834 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
835 if (!hard_iface || hard_iface->soft_iface)
838 ret = batadv_hardif_enable_interface(hard_iface, dev);
842 batadv_hardif_put(hard_iface);
847 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
848 * @dev: batadv_soft_interface used as master interface
849 * @slave_dev: net_device which should be removed from the master interface
851 * Return: 0 if successful or error otherwise.
853 static int batadv_softif_slave_del(struct net_device *dev,
854 struct net_device *slave_dev)
856 struct batadv_hard_iface *hard_iface;
859 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
861 if (!hard_iface || hard_iface->soft_iface != dev)
864 batadv_hardif_disable_interface(hard_iface);
869 batadv_hardif_put(hard_iface);
873 static const struct net_device_ops batadv_netdev_ops = {
874 .ndo_init = batadv_softif_init_late,
875 .ndo_open = batadv_interface_open,
876 .ndo_stop = batadv_interface_release,
877 .ndo_get_stats = batadv_interface_stats,
878 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
879 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
880 .ndo_set_mac_address = batadv_interface_set_mac_addr,
881 .ndo_change_mtu = batadv_interface_change_mtu,
882 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
883 .ndo_start_xmit = batadv_interface_tx,
884 .ndo_validate_addr = eth_validate_addr,
885 .ndo_add_slave = batadv_softif_slave_add,
886 .ndo_del_slave = batadv_softif_slave_del,
889 static void batadv_get_drvinfo(struct net_device *dev,
890 struct ethtool_drvinfo *info)
892 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
893 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
894 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
895 strscpy(info->bus_info, "batman", sizeof(info->bus_info));
898 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
899 * Declare each description string in struct.name[] to get fixed sized buffer
900 * and compile time checking for strings longer than ETH_GSTRING_LEN.
902 static const struct {
903 const char name[ETH_GSTRING_LEN];
904 } batadv_counters_strings[] = {
921 { "frag_fwd_bytes" },
924 { "tt_response_tx" },
925 { "tt_response_rx" },
926 { "tt_roam_adv_tx" },
927 { "tt_roam_adv_rx" },
928 #ifdef CONFIG_BATMAN_ADV_DAT
933 { "dat_cached_reply_tx" },
935 #ifdef CONFIG_BATMAN_ADV_NC
939 { "nc_recode_bytes" },
942 { "nc_decode_bytes" },
943 { "nc_decode_failed" },
948 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
950 if (stringset == ETH_SS_STATS)
951 memcpy(data, batadv_counters_strings,
952 sizeof(batadv_counters_strings));
955 static void batadv_get_ethtool_stats(struct net_device *dev,
956 struct ethtool_stats *stats, u64 *data)
958 struct batadv_priv *bat_priv = netdev_priv(dev);
961 for (i = 0; i < BATADV_CNT_NUM; i++)
962 data[i] = batadv_sum_counter(bat_priv, i);
965 static int batadv_get_sset_count(struct net_device *dev, int stringset)
967 if (stringset == ETH_SS_STATS)
968 return BATADV_CNT_NUM;
973 static const struct ethtool_ops batadv_ethtool_ops = {
974 .get_drvinfo = batadv_get_drvinfo,
975 .get_link = ethtool_op_get_link,
976 .get_strings = batadv_get_strings,
977 .get_ethtool_stats = batadv_get_ethtool_stats,
978 .get_sset_count = batadv_get_sset_count,
982 * batadv_softif_free() - Deconstructor of batadv_soft_interface
983 * @dev: Device to cleanup and remove
985 static void batadv_softif_free(struct net_device *dev)
987 batadv_mesh_free(dev);
989 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
990 * their tasks. Wait for them all to be finished before freeing the
991 * netdev and its private data (bat_priv)
997 * batadv_softif_init_early() - early stage initialization of soft interface
998 * @dev: registered network device to modify
1000 static void batadv_softif_init_early(struct net_device *dev)
1004 dev->netdev_ops = &batadv_netdev_ops;
1005 dev->needs_free_netdev = true;
1006 dev->priv_destructor = batadv_softif_free;
1007 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1008 dev->features |= NETIF_F_LLTX;
1009 dev->priv_flags |= IFF_NO_QUEUE;
1011 /* can't call min_mtu, because the needed variables
1012 * have not been initialized yet
1014 dev->mtu = ETH_DATA_LEN;
1016 /* generate random address */
1017 eth_hw_addr_random(dev);
1019 dev->ethtool_ops = &batadv_ethtool_ops;
1023 * batadv_softif_validate() - validate configuration of new batadv link
1024 * @tb: IFLA_INFO_DATA netlink attributes
1025 * @data: enum batadv_ifla_attrs attributes
1026 * @extack: extended ACK report struct
1028 * Return: 0 if successful or error otherwise.
1030 static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[],
1031 struct netlink_ext_ack *extack)
1033 struct batadv_algo_ops *algo_ops;
1038 if (data[IFLA_BATADV_ALGO_NAME]) {
1039 algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME]));
1048 * batadv_softif_newlink() - pre-initialize and register new batadv link
1049 * @src_net: the applicable net namespace
1050 * @dev: network device to register
1051 * @tb: IFLA_INFO_DATA netlink attributes
1052 * @data: enum batadv_ifla_attrs attributes
1053 * @extack: extended ACK report struct
1055 * Return: 0 if successful or error otherwise.
1057 static int batadv_softif_newlink(struct net *src_net, struct net_device *dev,
1058 struct nlattr *tb[], struct nlattr *data[],
1059 struct netlink_ext_ack *extack)
1061 struct batadv_priv *bat_priv = netdev_priv(dev);
1062 const char *algo_name;
1065 if (data && data[IFLA_BATADV_ALGO_NAME]) {
1066 algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]);
1067 err = batadv_algo_select(bat_priv, algo_name);
1072 return register_netdevice(dev);
1076 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1078 * @soft_iface: the to-be-removed batman-adv interface
1079 * @head: list pointer
1081 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1082 struct list_head *head)
1084 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1085 struct batadv_hard_iface *hard_iface;
1086 struct batadv_softif_vlan *vlan;
1088 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1089 if (hard_iface->soft_iface == soft_iface)
1090 batadv_hardif_disable_interface(hard_iface);
1093 /* destroy the "untagged" VLAN */
1094 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1096 batadv_softif_destroy_vlan(bat_priv, vlan);
1097 batadv_softif_vlan_put(vlan);
1100 unregister_netdevice_queue(soft_iface, head);
1104 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1105 * @net_dev: device which should be checked
1107 * Return: true when net_dev is a batman-adv interface, false otherwise
1109 bool batadv_softif_is_valid(const struct net_device *net_dev)
1111 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1117 static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1118 [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1121 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1123 .priv_size = sizeof(struct batadv_priv),
1124 .setup = batadv_softif_init_early,
1125 .maxtype = IFLA_BATADV_MAX,
1126 .policy = batadv_ifla_policy,
1127 .validate = batadv_softif_validate,
1128 .newlink = batadv_softif_newlink,
1129 .dellink = batadv_softif_destroy_netlink,