]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - net/batman-adv/soft-interface.c
UBUNTU: Ubuntu-5.11.0-22.23
[mirror_ubuntu-hirsute-kernel.git] / net / batman-adv / soft-interface.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 */
6
7 #include "soft-interface.h"
8 #include "main.h"
9
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/skbuff.h>
34 #include <linux/slab.h>
35 #include <linux/socket.h>
36 #include <linux/spinlock.h>
37 #include <linux/stddef.h>
38 #include <linux/string.h>
39 #include <linux/types.h>
40 #include <net/netlink.h>
41 #include <uapi/linux/batadv_packet.h>
42 #include <uapi/linux/batman_adv.h>
43
44 #include "bat_algo.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"
52 #include "send.h"
53 #include "translation-table.h"
54
55 /**
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
59 *
60 * Return: 0 on success or negative error number in case of failure
61 */
62 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
63 {
64 int result;
65
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.
72 */
73 result = skb_cow_head(skb, len);
74 if (result < 0)
75 return result;
76
77 skb_push(skb, len);
78 return 0;
79 }
80
81 static int batadv_interface_open(struct net_device *dev)
82 {
83 netif_start_queue(dev);
84 return 0;
85 }
86
87 static int batadv_interface_release(struct net_device *dev)
88 {
89 netif_stop_queue(dev);
90 return 0;
91 }
92
93 /**
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
97 *
98 * Return: sum of all cpu-local counters
99 */
100 static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
101 {
102 u64 *counters, sum = 0;
103 int cpu;
104
105 for_each_possible_cpu(cpu) {
106 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
107 sum += counters[idx];
108 }
109
110 return sum;
111 }
112
113 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
114 {
115 struct batadv_priv *bat_priv = netdev_priv(dev);
116 struct net_device_stats *stats = &dev->stats;
117
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);
123 return stats;
124 }
125
126 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
127 {
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];
132
133 if (!is_valid_ether_addr(addr->sa_data))
134 return -EADDRNOTAVAIL;
135
136 ether_addr_copy(old_addr, dev->dev_addr);
137 ether_addr_copy(dev->dev_addr, addr->sa_data);
138
139 /* only modify transtable if it has been initialized before */
140 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
141 return 0;
142
143 rcu_read_lock();
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);
149 }
150 rcu_read_unlock();
151
152 return 0;
153 }
154
155 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
156 {
157 /* check ranges */
158 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
159 return -EINVAL;
160
161 dev->mtu = new_mtu;
162
163 return 0;
164 }
165
166 /**
167 * batadv_interface_set_rx_mode() - set the rx mode of a device
168 * @dev: registered network device to modify
169 *
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.
173 */
174 static void batadv_interface_set_rx_mode(struct net_device *dev)
175 {
176 }
177
178 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
179 struct net_device *soft_iface)
180 {
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,
186 0x00, 0x00};
187 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
188 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 = 1;
195 bool do_bcast = false, client_added;
196 unsigned short vid;
197 u32 seqno;
198 int gw_mode;
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;
202 __be16 proto;
203
204 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
205 goto dropped;
206
207 /* reset control block to avoid left overs from previous users */
208 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
209
210 netif_trans_update(soft_iface);
211 vid = batadv_get_vid(skb, 0);
212
213 skb_reset_mac_header(skb);
214 ethhdr = eth_hdr(skb);
215
216 proto = ethhdr->h_proto;
217
218 switch (ntohs(proto)) {
219 case ETH_P_8021Q:
220 if (!pskb_may_pull(skb, sizeof(*vhdr)))
221 goto dropped;
222 vhdr = vlan_eth_hdr(skb);
223 proto = vhdr->h_vlan_encapsulated_proto;
224
225 /* drop batman-in-batman packets to prevent loops */
226 if (proto != htons(ETH_P_BATMAN)) {
227 network_offset += VLAN_HLEN;
228 break;
229 }
230
231 fallthrough;
232 case ETH_P_BATMAN:
233 goto dropped;
234 }
235
236 skb_set_network_header(skb, network_offset);
237
238 if (batadv_bla_tx(bat_priv, skb, vid))
239 goto dropped;
240
241 /* skb->data might have been reallocated by batadv_bla_tx() */
242 ethhdr = eth_hdr(skb);
243
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,
248 vid, skb->skb_iif,
249 skb->mark);
250 if (!client_added)
251 goto dropped;
252 }
253
254 /* Snoop address candidates from DHCPACKs for early DAT filling */
255 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
256
257 /* don't accept stp packets. STP does not help in meshes.
258 * better use the bridge loop avoidance ...
259 *
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.
262 */
263 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
264 goto dropped;
265
266 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
267 goto dropped;
268
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) {
273 do_bcast = true;
274 goto send;
275 }
276
277 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
278 chaddr);
279 /* skb->data may have been modified by
280 * batadv_gw_dhcp_recipient_get()
281 */
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
285 */
286 if (dhcp_rcp == BATADV_DHCP_NO) {
287 do_bcast = true;
288 goto send;
289 }
290
291 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
292 dst_hint = chaddr;
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
297 */
298 goto dropped;
299
300 send:
301 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
302 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
303 &mcast_single_orig);
304 if (forw_mode == BATADV_FORW_NONE)
305 goto dropped;
306
307 if (forw_mode == BATADV_FORW_SINGLE ||
308 forw_mode == BATADV_FORW_SOME)
309 do_bcast = false;
310 }
311 }
312
313 batadv_skb_set_priority(skb, 0);
314
315 /* ethernet packet should be broadcasted */
316 if (do_bcast) {
317 primary_if = batadv_primary_if_get_selected(bat_priv);
318 if (!primary_if)
319 goto dropped;
320
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
323 * correct ARP entry
324 */
325 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
326 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
327
328 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
329 goto dropped;
330
331 bcast_packet = (struct batadv_bcast_packet *)skb->data;
332 bcast_packet->version = BATADV_COMPAT_VERSION;
333 bcast_packet->ttl = BATADV_TTL;
334
335 /* batman packet type: broadcast */
336 bcast_packet->packet_type = BATADV_BCAST;
337 bcast_packet->reserved = 0;
338
339 /* hw address of first interface is the orig mac because only
340 * this mac is known throughout the mesh
341 */
342 ether_addr_copy(bcast_packet->orig,
343 primary_if->net_dev->dev_addr);
344
345 /* set broadcast sequence number */
346 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
347 bcast_packet->seqno = htonl(seqno);
348
349 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
350
351 /* a copy is stored in the bcast list, therefore removing
352 * the original skb.
353 */
354 consume_skb(skb);
355
356 /* unicast packet */
357 } else {
358 /* DHCP packets going to a server will use the GW feature */
359 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
360 ret = batadv_gw_out_of_range(bat_priv, skb);
361 if (ret)
362 goto dropped;
363 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
364 } else if (mcast_single_orig) {
365 ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
366 mcast_single_orig);
367 } else if (forw_mode == BATADV_FORW_SOME) {
368 ret = batadv_mcast_forw_send(bat_priv, skb, vid);
369 } else {
370 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
371 skb))
372 goto dropped;
373
374 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
375
376 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
377 vid);
378 }
379 if (ret != NET_XMIT_SUCCESS)
380 goto dropped_freed;
381 }
382
383 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
384 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
385 goto end;
386
387 dropped:
388 kfree_skb(skb);
389 dropped_freed:
390 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
391 end:
392 if (mcast_single_orig)
393 batadv_orig_node_put(mcast_single_orig);
394 if (primary_if)
395 batadv_hardif_put(primary_if);
396 return NETDEV_TX_OK;
397 }
398
399 /**
400 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
401 * @soft_iface: local interface which will receive the ethernet frame
402 * @skb: ethernet frame for @soft_iface
403 * @hdr_size: size of already parsed batman-adv header
404 * @orig_node: originator from which the batman-adv packet was sent
405 *
406 * Sends an ethernet frame to the receive path of the local @soft_iface.
407 * skb->data has still point to the batman-adv header with the size @hdr_size.
408 * The caller has to have parsed this header already and made sure that at least
409 * @hdr_size bytes are still available for pull in @skb.
410 *
411 * The packet may still get dropped. This can happen when the encapsulated
412 * ethernet frame is invalid or contains again an batman-adv packet. Also
413 * unicast packets will be dropped directly when it was sent between two
414 * isolated clients.
415 */
416 void batadv_interface_rx(struct net_device *soft_iface,
417 struct sk_buff *skb, int hdr_size,
418 struct batadv_orig_node *orig_node)
419 {
420 struct batadv_bcast_packet *batadv_bcast_packet;
421 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
422 struct vlan_ethhdr *vhdr;
423 struct ethhdr *ethhdr;
424 unsigned short vid;
425 int packet_type;
426
427 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
428 packet_type = batadv_bcast_packet->packet_type;
429
430 skb_pull_rcsum(skb, hdr_size);
431 skb_reset_mac_header(skb);
432
433 /* clean the netfilter state now that the batman-adv header has been
434 * removed
435 */
436 nf_reset_ct(skb);
437
438 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
439 goto dropped;
440
441 vid = batadv_get_vid(skb, 0);
442 ethhdr = eth_hdr(skb);
443
444 switch (ntohs(ethhdr->h_proto)) {
445 case ETH_P_8021Q:
446 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
447 goto dropped;
448
449 vhdr = (struct vlan_ethhdr *)skb->data;
450
451 /* drop batman-in-batman packets to prevent loops */
452 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
453 break;
454
455 fallthrough;
456 case ETH_P_BATMAN:
457 goto dropped;
458 }
459
460 /* skb->dev & skb->pkt_type are set here */
461 skb->protocol = eth_type_trans(skb, soft_iface);
462 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
463
464 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
465 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
466 skb->len + ETH_HLEN);
467
468 /* Let the bridge loop avoidance check the packet. If will
469 * not handle it, we can safely push it up.
470 */
471 if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
472 goto out;
473
474 if (orig_node)
475 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
476 ethhdr->h_source, vid);
477
478 if (is_multicast_ether_addr(ethhdr->h_dest)) {
479 /* set the mark on broadcast packets if AP isolation is ON and
480 * the packet is coming from an "isolated" client
481 */
482 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
483 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
484 vid)) {
485 /* save bits in skb->mark not covered by the mask and
486 * apply the mark on the rest
487 */
488 skb->mark &= ~bat_priv->isolation_mark_mask;
489 skb->mark |= bat_priv->isolation_mark;
490 }
491 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
492 ethhdr->h_dest, vid)) {
493 goto dropped;
494 }
495
496 netif_rx(skb);
497 goto out;
498
499 dropped:
500 kfree_skb(skb);
501 out:
502 return;
503 }
504
505 /**
506 * batadv_softif_vlan_release() - release vlan from lists and queue for free
507 * after rcu grace period
508 * @ref: kref pointer of the vlan object
509 */
510 static void batadv_softif_vlan_release(struct kref *ref)
511 {
512 struct batadv_softif_vlan *vlan;
513
514 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
515
516 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
517 hlist_del_rcu(&vlan->list);
518 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
519
520 kfree_rcu(vlan, rcu);
521 }
522
523 /**
524 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
525 * possibly release it
526 * @vlan: the vlan object to release
527 */
528 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
529 {
530 if (!vlan)
531 return;
532
533 kref_put(&vlan->refcount, batadv_softif_vlan_release);
534 }
535
536 /**
537 * batadv_softif_vlan_get() - get the vlan object for a specific vid
538 * @bat_priv: the bat priv with all the soft interface information
539 * @vid: the identifier of the vlan object to retrieve
540 *
541 * Return: the private data of the vlan matching the vid passed as argument or
542 * NULL otherwise. The refcounter of the returned object is incremented by 1.
543 */
544 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
545 unsigned short vid)
546 {
547 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
548
549 rcu_read_lock();
550 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
551 if (vlan_tmp->vid != vid)
552 continue;
553
554 if (!kref_get_unless_zero(&vlan_tmp->refcount))
555 continue;
556
557 vlan = vlan_tmp;
558 break;
559 }
560 rcu_read_unlock();
561
562 return vlan;
563 }
564
565 /**
566 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
567 * @bat_priv: the bat priv with all the soft interface information
568 * @vid: the VLAN identifier
569 *
570 * Return: 0 on success, a negative error otherwise.
571 */
572 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
573 {
574 struct batadv_softif_vlan *vlan;
575
576 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
577
578 vlan = batadv_softif_vlan_get(bat_priv, vid);
579 if (vlan) {
580 batadv_softif_vlan_put(vlan);
581 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
582 return -EEXIST;
583 }
584
585 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
586 if (!vlan) {
587 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
588 return -ENOMEM;
589 }
590
591 vlan->bat_priv = bat_priv;
592 vlan->vid = vid;
593 kref_init(&vlan->refcount);
594
595 atomic_set(&vlan->ap_isolation, 0);
596
597 kref_get(&vlan->refcount);
598 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
599 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
600
601 /* add a new TT local entry. This one will be marked with the NOPURGE
602 * flag
603 */
604 batadv_tt_local_add(bat_priv->soft_iface,
605 bat_priv->soft_iface->dev_addr, vid,
606 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
607
608 /* don't return reference to new softif_vlan */
609 batadv_softif_vlan_put(vlan);
610
611 return 0;
612 }
613
614 /**
615 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
616 * @bat_priv: the bat priv with all the soft interface information
617 * @vlan: the object to remove
618 */
619 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
620 struct batadv_softif_vlan *vlan)
621 {
622 /* explicitly remove the associated TT local entry because it is marked
623 * with the NOPURGE flag
624 */
625 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
626 vlan->vid, "vlan interface destroyed", false);
627
628 batadv_softif_vlan_put(vlan);
629 }
630
631 /**
632 * batadv_interface_add_vid() - ndo_add_vid API implementation
633 * @dev: the netdev of the mesh interface
634 * @proto: protocol of the vlan id
635 * @vid: identifier of the new vlan
636 *
637 * Set up all the internal structures for handling the new vlan on top of the
638 * mesh interface
639 *
640 * Return: 0 on success or a negative error code in case of failure.
641 */
642 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
643 unsigned short vid)
644 {
645 struct batadv_priv *bat_priv = netdev_priv(dev);
646 struct batadv_softif_vlan *vlan;
647
648 /* only 802.1Q vlans are supported.
649 * batman-adv does not know how to handle other types
650 */
651 if (proto != htons(ETH_P_8021Q))
652 return -EINVAL;
653
654 vid |= BATADV_VLAN_HAS_TAG;
655
656 /* if a new vlan is getting created and it already exists, it means that
657 * it was not deleted yet. batadv_softif_vlan_get() increases the
658 * refcount in order to revive the object.
659 *
660 * if it does not exist then create it.
661 */
662 vlan = batadv_softif_vlan_get(bat_priv, vid);
663 if (!vlan)
664 return batadv_softif_create_vlan(bat_priv, vid);
665
666 /* add a new TT local entry. This one will be marked with the NOPURGE
667 * flag. This must be added again, even if the vlan object already
668 * exists, because the entry was deleted by kill_vid()
669 */
670 batadv_tt_local_add(bat_priv->soft_iface,
671 bat_priv->soft_iface->dev_addr, vid,
672 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
673
674 return 0;
675 }
676
677 /**
678 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
679 * @dev: the netdev of the mesh interface
680 * @proto: protocol of the vlan id
681 * @vid: identifier of the deleted vlan
682 *
683 * Destroy all the internal structures used to handle the vlan identified by vid
684 * on top of the mesh interface
685 *
686 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
687 * or -ENOENT if the specified vlan id wasn't registered.
688 */
689 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
690 unsigned short vid)
691 {
692 struct batadv_priv *bat_priv = netdev_priv(dev);
693 struct batadv_softif_vlan *vlan;
694
695 /* only 802.1Q vlans are supported. batman-adv does not know how to
696 * handle other types
697 */
698 if (proto != htons(ETH_P_8021Q))
699 return -EINVAL;
700
701 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
702 if (!vlan)
703 return -ENOENT;
704
705 batadv_softif_destroy_vlan(bat_priv, vlan);
706
707 /* finally free the vlan object */
708 batadv_softif_vlan_put(vlan);
709
710 return 0;
711 }
712
713 /* batman-adv network devices have devices nesting below it and are a special
714 * "super class" of normal network devices; split their locks off into a
715 * separate class since they always nest.
716 */
717 static struct lock_class_key batadv_netdev_xmit_lock_key;
718 static struct lock_class_key batadv_netdev_addr_lock_key;
719
720 /**
721 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
722 * @dev: device which owns the tx queue
723 * @txq: tx queue to modify
724 * @_unused: always NULL
725 */
726 static void batadv_set_lockdep_class_one(struct net_device *dev,
727 struct netdev_queue *txq,
728 void *_unused)
729 {
730 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
731 }
732
733 /**
734 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
735 * @dev: network device to modify
736 */
737 static void batadv_set_lockdep_class(struct net_device *dev)
738 {
739 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
740 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
741 }
742
743 /**
744 * batadv_softif_init_late() - late stage initialization of soft interface
745 * @dev: registered network device to modify
746 *
747 * Return: error code on failures
748 */
749 static int batadv_softif_init_late(struct net_device *dev)
750 {
751 struct batadv_priv *bat_priv;
752 u32 random_seqno;
753 int ret;
754 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
755
756 batadv_set_lockdep_class(dev);
757
758 bat_priv = netdev_priv(dev);
759 bat_priv->soft_iface = dev;
760
761 /* batadv_interface_stats() needs to be available as soon as
762 * register_netdevice() has been called
763 */
764 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
765 if (!bat_priv->bat_counters)
766 return -ENOMEM;
767
768 atomic_set(&bat_priv->aggregated_ogms, 1);
769 atomic_set(&bat_priv->bonding, 0);
770 #ifdef CONFIG_BATMAN_ADV_BLA
771 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
772 #endif
773 #ifdef CONFIG_BATMAN_ADV_DAT
774 atomic_set(&bat_priv->distributed_arp_table, 1);
775 #endif
776 #ifdef CONFIG_BATMAN_ADV_MCAST
777 atomic_set(&bat_priv->multicast_mode, 1);
778 atomic_set(&bat_priv->multicast_fanout, 16);
779 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
780 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
781 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
782 #endif
783 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
784 atomic_set(&bat_priv->gw.bandwidth_down, 100);
785 atomic_set(&bat_priv->gw.bandwidth_up, 20);
786 atomic_set(&bat_priv->orig_interval, 1000);
787 atomic_set(&bat_priv->hop_penalty, 30);
788 #ifdef CONFIG_BATMAN_ADV_DEBUG
789 atomic_set(&bat_priv->log_level, 0);
790 #endif
791 atomic_set(&bat_priv->fragmentation, 1);
792 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
793 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
794 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
795
796 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
797 atomic_set(&bat_priv->bcast_seqno, 1);
798 atomic_set(&bat_priv->tt.vn, 0);
799 atomic_set(&bat_priv->tt.local_changes, 0);
800 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
801 #ifdef CONFIG_BATMAN_ADV_BLA
802 atomic_set(&bat_priv->bla.num_requests, 0);
803 #endif
804 atomic_set(&bat_priv->tp_num, 0);
805
806 bat_priv->tt.last_changeset = NULL;
807 bat_priv->tt.last_changeset_len = 0;
808 bat_priv->isolation_mark = 0;
809 bat_priv->isolation_mark_mask = 0;
810
811 /* randomize initial seqno to avoid collision */
812 get_random_bytes(&random_seqno, sizeof(random_seqno));
813 atomic_set(&bat_priv->frag_seqno, random_seqno);
814
815 bat_priv->primary_if = NULL;
816
817 batadv_nc_init_bat_priv(bat_priv);
818
819 if (!bat_priv->algo_ops) {
820 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
821 if (ret < 0)
822 goto free_bat_counters;
823 }
824
825 ret = batadv_mesh_init(dev);
826 if (ret < 0)
827 goto free_bat_counters;
828
829 return 0;
830
831 free_bat_counters:
832 free_percpu(bat_priv->bat_counters);
833 bat_priv->bat_counters = NULL;
834
835 return ret;
836 }
837
838 /**
839 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
840 * @dev: batadv_soft_interface used as master interface
841 * @slave_dev: net_device which should become the slave interface
842 * @extack: extended ACK report struct
843 *
844 * Return: 0 if successful or error otherwise.
845 */
846 static int batadv_softif_slave_add(struct net_device *dev,
847 struct net_device *slave_dev,
848 struct netlink_ext_ack *extack)
849 {
850 struct batadv_hard_iface *hard_iface;
851 struct net *net = dev_net(dev);
852 int ret = -EINVAL;
853
854 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
855 if (!hard_iface || hard_iface->soft_iface)
856 goto out;
857
858 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
859
860 out:
861 if (hard_iface)
862 batadv_hardif_put(hard_iface);
863 return ret;
864 }
865
866 /**
867 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
868 * @dev: batadv_soft_interface used as master interface
869 * @slave_dev: net_device which should be removed from the master interface
870 *
871 * Return: 0 if successful or error otherwise.
872 */
873 static int batadv_softif_slave_del(struct net_device *dev,
874 struct net_device *slave_dev)
875 {
876 struct batadv_hard_iface *hard_iface;
877 int ret = -EINVAL;
878
879 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
880
881 if (!hard_iface || hard_iface->soft_iface != dev)
882 goto out;
883
884 batadv_hardif_disable_interface(hard_iface);
885 ret = 0;
886
887 out:
888 if (hard_iface)
889 batadv_hardif_put(hard_iface);
890 return ret;
891 }
892
893 static const struct net_device_ops batadv_netdev_ops = {
894 .ndo_init = batadv_softif_init_late,
895 .ndo_open = batadv_interface_open,
896 .ndo_stop = batadv_interface_release,
897 .ndo_get_stats = batadv_interface_stats,
898 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
899 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
900 .ndo_set_mac_address = batadv_interface_set_mac_addr,
901 .ndo_change_mtu = batadv_interface_change_mtu,
902 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
903 .ndo_start_xmit = batadv_interface_tx,
904 .ndo_validate_addr = eth_validate_addr,
905 .ndo_add_slave = batadv_softif_slave_add,
906 .ndo_del_slave = batadv_softif_slave_del,
907 };
908
909 static void batadv_get_drvinfo(struct net_device *dev,
910 struct ethtool_drvinfo *info)
911 {
912 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
913 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
914 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
915 strscpy(info->bus_info, "batman", sizeof(info->bus_info));
916 }
917
918 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
919 * Declare each description string in struct.name[] to get fixed sized buffer
920 * and compile time checking for strings longer than ETH_GSTRING_LEN.
921 */
922 static const struct {
923 const char name[ETH_GSTRING_LEN];
924 } batadv_counters_strings[] = {
925 { "tx" },
926 { "tx_bytes" },
927 { "tx_dropped" },
928 { "rx" },
929 { "rx_bytes" },
930 { "forward" },
931 { "forward_bytes" },
932 { "mgmt_tx" },
933 { "mgmt_tx_bytes" },
934 { "mgmt_rx" },
935 { "mgmt_rx_bytes" },
936 { "frag_tx" },
937 { "frag_tx_bytes" },
938 { "frag_rx" },
939 { "frag_rx_bytes" },
940 { "frag_fwd" },
941 { "frag_fwd_bytes" },
942 { "tt_request_tx" },
943 { "tt_request_rx" },
944 { "tt_response_tx" },
945 { "tt_response_rx" },
946 { "tt_roam_adv_tx" },
947 { "tt_roam_adv_rx" },
948 #ifdef CONFIG_BATMAN_ADV_DAT
949 { "dat_get_tx" },
950 { "dat_get_rx" },
951 { "dat_put_tx" },
952 { "dat_put_rx" },
953 { "dat_cached_reply_tx" },
954 #endif
955 #ifdef CONFIG_BATMAN_ADV_NC
956 { "nc_code" },
957 { "nc_code_bytes" },
958 { "nc_recode" },
959 { "nc_recode_bytes" },
960 { "nc_buffer" },
961 { "nc_decode" },
962 { "nc_decode_bytes" },
963 { "nc_decode_failed" },
964 { "nc_sniffed" },
965 #endif
966 };
967
968 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
969 {
970 if (stringset == ETH_SS_STATS)
971 memcpy(data, batadv_counters_strings,
972 sizeof(batadv_counters_strings));
973 }
974
975 static void batadv_get_ethtool_stats(struct net_device *dev,
976 struct ethtool_stats *stats, u64 *data)
977 {
978 struct batadv_priv *bat_priv = netdev_priv(dev);
979 int i;
980
981 for (i = 0; i < BATADV_CNT_NUM; i++)
982 data[i] = batadv_sum_counter(bat_priv, i);
983 }
984
985 static int batadv_get_sset_count(struct net_device *dev, int stringset)
986 {
987 if (stringset == ETH_SS_STATS)
988 return BATADV_CNT_NUM;
989
990 return -EOPNOTSUPP;
991 }
992
993 static const struct ethtool_ops batadv_ethtool_ops = {
994 .get_drvinfo = batadv_get_drvinfo,
995 .get_link = ethtool_op_get_link,
996 .get_strings = batadv_get_strings,
997 .get_ethtool_stats = batadv_get_ethtool_stats,
998 .get_sset_count = batadv_get_sset_count,
999 };
1000
1001 /**
1002 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1003 * @dev: Device to cleanup and remove
1004 */
1005 static void batadv_softif_free(struct net_device *dev)
1006 {
1007 batadv_mesh_free(dev);
1008
1009 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1010 * their tasks. Wait for them all to be finished before freeing the
1011 * netdev and its private data (bat_priv)
1012 */
1013 rcu_barrier();
1014 }
1015
1016 /**
1017 * batadv_softif_init_early() - early stage initialization of soft interface
1018 * @dev: registered network device to modify
1019 */
1020 static void batadv_softif_init_early(struct net_device *dev)
1021 {
1022 ether_setup(dev);
1023
1024 dev->netdev_ops = &batadv_netdev_ops;
1025 dev->needs_free_netdev = true;
1026 dev->priv_destructor = batadv_softif_free;
1027 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1028 dev->features |= NETIF_F_LLTX;
1029 dev->priv_flags |= IFF_NO_QUEUE;
1030
1031 /* can't call min_mtu, because the needed variables
1032 * have not been initialized yet
1033 */
1034 dev->mtu = ETH_DATA_LEN;
1035
1036 /* generate random address */
1037 eth_hw_addr_random(dev);
1038
1039 dev->ethtool_ops = &batadv_ethtool_ops;
1040 }
1041
1042 /**
1043 * batadv_softif_validate() - validate configuration of new batadv link
1044 * @tb: IFLA_INFO_DATA netlink attributes
1045 * @data: enum batadv_ifla_attrs attributes
1046 * @extack: extended ACK report struct
1047 *
1048 * Return: 0 if successful or error otherwise.
1049 */
1050 static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[],
1051 struct netlink_ext_ack *extack)
1052 {
1053 struct batadv_algo_ops *algo_ops;
1054
1055 if (!data)
1056 return 0;
1057
1058 if (data[IFLA_BATADV_ALGO_NAME]) {
1059 algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME]));
1060 if (!algo_ops)
1061 return -EINVAL;
1062 }
1063
1064 return 0;
1065 }
1066
1067 /**
1068 * batadv_softif_newlink() - pre-initialize and register new batadv link
1069 * @src_net: the applicable net namespace
1070 * @dev: network device to register
1071 * @tb: IFLA_INFO_DATA netlink attributes
1072 * @data: enum batadv_ifla_attrs attributes
1073 * @extack: extended ACK report struct
1074 *
1075 * Return: 0 if successful or error otherwise.
1076 */
1077 static int batadv_softif_newlink(struct net *src_net, struct net_device *dev,
1078 struct nlattr *tb[], struct nlattr *data[],
1079 struct netlink_ext_ack *extack)
1080 {
1081 struct batadv_priv *bat_priv = netdev_priv(dev);
1082 const char *algo_name;
1083 int err;
1084
1085 if (data && data[IFLA_BATADV_ALGO_NAME]) {
1086 algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]);
1087 err = batadv_algo_select(bat_priv, algo_name);
1088 if (err)
1089 return -EINVAL;
1090 }
1091
1092 return register_netdevice(dev);
1093 }
1094
1095 /**
1096 * batadv_softif_create() - Create and register soft interface
1097 * @net: the applicable net namespace
1098 * @name: name of the new soft interface
1099 *
1100 * Return: newly allocated soft_interface, NULL on errors
1101 */
1102 struct net_device *batadv_softif_create(struct net *net, const char *name)
1103 {
1104 struct net_device *soft_iface;
1105 int ret;
1106
1107 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1108 NET_NAME_UNKNOWN, batadv_softif_init_early);
1109 if (!soft_iface)
1110 return NULL;
1111
1112 dev_net_set(soft_iface, net);
1113
1114 soft_iface->rtnl_link_ops = &batadv_link_ops;
1115
1116 ret = register_netdevice(soft_iface);
1117 if (ret < 0) {
1118 pr_err("Unable to register the batman interface '%s': %i\n",
1119 name, ret);
1120 free_netdev(soft_iface);
1121 return NULL;
1122 }
1123
1124 return soft_iface;
1125 }
1126
1127 /**
1128 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1129 * netlink
1130 * @soft_iface: the to-be-removed batman-adv interface
1131 * @head: list pointer
1132 */
1133 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1134 struct list_head *head)
1135 {
1136 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1137 struct batadv_hard_iface *hard_iface;
1138 struct batadv_softif_vlan *vlan;
1139
1140 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1141 if (hard_iface->soft_iface == soft_iface)
1142 batadv_hardif_disable_interface(hard_iface);
1143 }
1144
1145 /* destroy the "untagged" VLAN */
1146 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1147 if (vlan) {
1148 batadv_softif_destroy_vlan(bat_priv, vlan);
1149 batadv_softif_vlan_put(vlan);
1150 }
1151
1152 unregister_netdevice_queue(soft_iface, head);
1153 }
1154
1155 /**
1156 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1157 * @net_dev: device which should be checked
1158 *
1159 * Return: true when net_dev is a batman-adv interface, false otherwise
1160 */
1161 bool batadv_softif_is_valid(const struct net_device *net_dev)
1162 {
1163 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1164 return true;
1165
1166 return false;
1167 }
1168
1169 static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1170 [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1171 };
1172
1173 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1174 .kind = "batadv",
1175 .priv_size = sizeof(struct batadv_priv),
1176 .setup = batadv_softif_init_early,
1177 .maxtype = IFLA_BATADV_MAX,
1178 .policy = batadv_ifla_policy,
1179 .validate = batadv_softif_validate,
1180 .newlink = batadv_softif_newlink,
1181 .dellink = batadv_softif_destroy_netlink,
1182 };