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,