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/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>
43
44 #include "bat_algo.h"
45 #include "bridge_loop_avoidance.h"
46 #include "debugfs.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"
53 #include "send.h"
54 #include "sysfs.h"
55 #include "translation-table.h"
56
57 /**
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
61 *
62 * Return: 0 on success or negative error number in case of failure
63 */
batadv_skb_head_push(struct sk_buff * skb,unsigned int len)64 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
65 {
66 int result;
67
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.
74 */
75 result = skb_cow_head(skb, len);
76 if (result < 0)
77 return result;
78
79 skb_push(skb, len);
80 return 0;
81 }
82
batadv_interface_open(struct net_device * dev)83 static int batadv_interface_open(struct net_device *dev)
84 {
85 netif_start_queue(dev);
86 return 0;
87 }
88
batadv_interface_release(struct net_device * dev)89 static int batadv_interface_release(struct net_device *dev)
90 {
91 netif_stop_queue(dev);
92 return 0;
93 }
94
95 /**
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
99 *
100 * Return: sum of all cpu-local counters
101 */
batadv_sum_counter(struct batadv_priv * bat_priv,size_t idx)102 static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
103 {
104 u64 *counters, sum = 0;
105 int cpu;
106
107 for_each_possible_cpu(cpu) {
108 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
109 sum += counters[idx];
110 }
111
112 return sum;
113 }
114
batadv_interface_stats(struct net_device * dev)115 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
116 {
117 struct batadv_priv *bat_priv = netdev_priv(dev);
118 struct net_device_stats *stats = &dev->stats;
119
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);
125 return stats;
126 }
127
batadv_interface_set_mac_addr(struct net_device * dev,void * p)128 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
129 {
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];
134
135 if (!is_valid_ether_addr(addr->sa_data))
136 return -EADDRNOTAVAIL;
137
138 ether_addr_copy(old_addr, dev->dev_addr);
139 ether_addr_copy(dev->dev_addr, addr->sa_data);
140
141 /* only modify transtable if it has been initialized before */
142 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
143 return 0;
144
145 rcu_read_lock();
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);
151 }
152 rcu_read_unlock();
153
154 return 0;
155 }
156
batadv_interface_change_mtu(struct net_device * dev,int new_mtu)157 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
158 {
159 struct batadv_priv *bat_priv = netdev_priv(dev);
160
161 /* check ranges */
162 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
163 return -EINVAL;
164
165 dev->mtu = new_mtu;
166 bat_priv->mtu_set_by_user = new_mtu;
167
168 return 0;
169 }
170
171 /**
172 * batadv_interface_set_rx_mode() - set the rx mode of a device
173 * @dev: registered network device to modify
174 *
175 * We do not actually need to set any rx filters for the virtual batman
176 * soft interface. However a dummy handler enables a user to set static
177 * multicast listeners for instance.
178 */
batadv_interface_set_rx_mode(struct net_device * dev)179 static void batadv_interface_set_rx_mode(struct net_device *dev)
180 {
181 }
182
batadv_interface_tx(struct sk_buff * skb,struct net_device * soft_iface)183 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
184 struct net_device *soft_iface)
185 {
186 struct ethhdr *ethhdr;
187 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
188 struct batadv_hard_iface *primary_if = NULL;
189 struct batadv_bcast_packet *bcast_packet;
190 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
191 0x00, 0x00};
192 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
193 0x00, 0x00};
194 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
195 u8 *dst_hint = NULL, chaddr[ETH_ALEN];
196 struct vlan_ethhdr *vhdr;
197 unsigned int header_len = 0;
198 int data_len = skb->len, ret;
199 unsigned long brd_delay = 1;
200 bool do_bcast = false, client_added;
201 unsigned short vid;
202 u32 seqno;
203 int gw_mode;
204 enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
205 struct batadv_orig_node *mcast_single_orig = NULL;
206 int mcast_is_routable = 0;
207 int network_offset = ETH_HLEN;
208 __be16 proto;
209
210 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
211 goto dropped;
212
213 /* reset control block to avoid left overs from previous users */
214 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
215
216 netif_trans_update(soft_iface);
217 vid = batadv_get_vid(skb, 0);
218
219 skb_reset_mac_header(skb);
220 ethhdr = eth_hdr(skb);
221
222 proto = ethhdr->h_proto;
223
224 switch (ntohs(proto)) {
225 case ETH_P_8021Q:
226 if (!pskb_may_pull(skb, sizeof(*vhdr)))
227 goto dropped;
228 vhdr = vlan_eth_hdr(skb);
229 proto = vhdr->h_vlan_encapsulated_proto;
230
231 /* drop batman-in-batman packets to prevent loops */
232 if (proto != htons(ETH_P_BATMAN)) {
233 network_offset += VLAN_HLEN;
234 break;
235 }
236
237 fallthrough;
238 case ETH_P_BATMAN:
239 goto dropped;
240 }
241
242 skb_set_network_header(skb, network_offset);
243
244 if (batadv_bla_tx(bat_priv, skb, vid))
245 goto dropped;
246
247 /* skb->data might have been reallocated by batadv_bla_tx() */
248 ethhdr = eth_hdr(skb);
249
250 /* Register the client MAC in the transtable */
251 if (!is_multicast_ether_addr(ethhdr->h_source) &&
252 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
253 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
254 vid, skb->skb_iif,
255 skb->mark);
256 if (!client_added)
257 goto dropped;
258 }
259
260 /* Snoop address candidates from DHCPACKs for early DAT filling */
261 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
262
263 /* don't accept stp packets. STP does not help in meshes.
264 * better use the bridge loop avoidance ...
265 *
266 * The same goes for ECTP sent at least by some Cisco Switches,
267 * it might confuse the mesh when used with bridge loop avoidance.
268 */
269 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
270 goto dropped;
271
272 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
273 goto dropped;
274
275 gw_mode = atomic_read(&bat_priv->gw.mode);
276 if (is_multicast_ether_addr(ethhdr->h_dest)) {
277 /* if gw mode is off, broadcast every packet */
278 if (gw_mode == BATADV_GW_MODE_OFF) {
279 do_bcast = true;
280 goto send;
281 }
282
283 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
284 chaddr);
285 /* skb->data may have been modified by
286 * batadv_gw_dhcp_recipient_get()
287 */
288 ethhdr = eth_hdr(skb);
289 /* if gw_mode is on, broadcast any non-DHCP message.
290 * All the DHCP packets are going to be sent as unicast
291 */
292 if (dhcp_rcp == BATADV_DHCP_NO) {
293 do_bcast = true;
294 goto send;
295 }
296
297 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
298 dst_hint = chaddr;
299 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
300 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
301 /* gateways should not forward any DHCP message if
302 * directed to a DHCP server
303 */
304 goto dropped;
305
306 send:
307 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
308 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
309 &mcast_single_orig,
310 &mcast_is_routable);
311 if (forw_mode == BATADV_FORW_NONE)
312 goto dropped;
313
314 if (forw_mode == BATADV_FORW_SINGLE ||
315 forw_mode == BATADV_FORW_SOME)
316 do_bcast = false;
317 }
318 }
319
320 batadv_skb_set_priority(skb, 0);
321
322 /* ethernet packet should be broadcasted */
323 if (do_bcast) {
324 primary_if = batadv_primary_if_get_selected(bat_priv);
325 if (!primary_if)
326 goto dropped;
327
328 /* in case of ARP request, we do not immediately broadcasti the
329 * packet, instead we first wait for DAT to try to retrieve the
330 * correct ARP entry
331 */
332 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
333 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
334
335 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
336 goto dropped;
337
338 bcast_packet = (struct batadv_bcast_packet *)skb->data;
339 bcast_packet->version = BATADV_COMPAT_VERSION;
340 bcast_packet->ttl = BATADV_TTL;
341
342 /* batman packet type: broadcast */
343 bcast_packet->packet_type = BATADV_BCAST;
344 bcast_packet->reserved = 0;
345
346 /* hw address of first interface is the orig mac because only
347 * this mac is known throughout the mesh
348 */
349 ether_addr_copy(bcast_packet->orig,
350 primary_if->net_dev->dev_addr);
351
352 /* set broadcast sequence number */
353 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
354 bcast_packet->seqno = htonl(seqno);
355
356 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
357
358 /* a copy is stored in the bcast list, therefore removing
359 * the original skb.
360 */
361 consume_skb(skb);
362
363 /* unicast packet */
364 } else {
365 /* DHCP packets going to a server will use the GW feature */
366 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
367 ret = batadv_gw_out_of_range(bat_priv, skb);
368 if (ret)
369 goto dropped;
370 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
371 } else if (mcast_single_orig) {
372 ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
373 mcast_single_orig);
374 } else if (forw_mode == BATADV_FORW_SOME) {
375 ret = batadv_mcast_forw_send(bat_priv, skb, vid,
376 mcast_is_routable);
377 } else {
378 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
379 skb))
380 goto dropped;
381
382 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
383
384 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
385 vid);
386 }
387 if (ret != NET_XMIT_SUCCESS)
388 goto dropped_freed;
389 }
390
391 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
392 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
393 goto end;
394
395 dropped:
396 kfree_skb(skb);
397 dropped_freed:
398 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
399 end:
400 if (mcast_single_orig)
401 batadv_orig_node_put(mcast_single_orig);
402 if (primary_if)
403 batadv_hardif_put(primary_if);
404 return NETDEV_TX_OK;
405 }
406
407 /**
408 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
409 * @soft_iface: local interface which will receive the ethernet frame
410 * @skb: ethernet frame for @soft_iface
411 * @hdr_size: size of already parsed batman-adv header
412 * @orig_node: originator from which the batman-adv packet was sent
413 *
414 * Sends an ethernet frame to the receive path of the local @soft_iface.
415 * skb->data has still point to the batman-adv header with the size @hdr_size.
416 * The caller has to have parsed this header already and made sure that at least
417 * @hdr_size bytes are still available for pull in @skb.
418 *
419 * The packet may still get dropped. This can happen when the encapsulated
420 * ethernet frame is invalid or contains again an batman-adv packet. Also
421 * unicast packets will be dropped directly when it was sent between two
422 * isolated clients.
423 */
batadv_interface_rx(struct net_device * soft_iface,struct sk_buff * skb,int hdr_size,struct batadv_orig_node * orig_node)424 void batadv_interface_rx(struct net_device *soft_iface,
425 struct sk_buff *skb, int hdr_size,
426 struct batadv_orig_node *orig_node)
427 {
428 struct batadv_bcast_packet *batadv_bcast_packet;
429 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
430 struct vlan_ethhdr *vhdr;
431 struct ethhdr *ethhdr;
432 unsigned short vid;
433 int packet_type;
434
435 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
436 packet_type = batadv_bcast_packet->packet_type;
437
438 skb_pull_rcsum(skb, hdr_size);
439 skb_reset_mac_header(skb);
440
441 /* clean the netfilter state now that the batman-adv header has been
442 * removed
443 */
444 nf_reset_ct(skb);
445
446 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
447 goto dropped;
448
449 vid = batadv_get_vid(skb, 0);
450 ethhdr = eth_hdr(skb);
451
452 switch (ntohs(ethhdr->h_proto)) {
453 case ETH_P_8021Q:
454 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
455 goto dropped;
456
457 vhdr = skb_vlan_eth_hdr(skb);
458
459 /* drop batman-in-batman packets to prevent loops */
460 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
461 break;
462
463 fallthrough;
464 case ETH_P_BATMAN:
465 goto dropped;
466 }
467
468 /* skb->dev & skb->pkt_type are set here */
469 skb->protocol = eth_type_trans(skb, soft_iface);
470 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
471
472 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
473 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
474 skb->len + ETH_HLEN);
475
476 /* Let the bridge loop avoidance check the packet. If will
477 * not handle it, we can safely push it up.
478 */
479 if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
480 goto out;
481
482 if (orig_node)
483 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
484 ethhdr->h_source, vid);
485
486 if (is_multicast_ether_addr(ethhdr->h_dest)) {
487 /* set the mark on broadcast packets if AP isolation is ON and
488 * the packet is coming from an "isolated" client
489 */
490 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
491 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
492 vid)) {
493 /* save bits in skb->mark not covered by the mask and
494 * apply the mark on the rest
495 */
496 skb->mark &= ~bat_priv->isolation_mark_mask;
497 skb->mark |= bat_priv->isolation_mark;
498 }
499 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
500 ethhdr->h_dest, vid)) {
501 goto dropped;
502 }
503
504 netif_rx(skb);
505 goto out;
506
507 dropped:
508 kfree_skb(skb);
509 out:
510 return;
511 }
512
513 /**
514 * batadv_softif_vlan_release() - release vlan from lists and queue for free
515 * after rcu grace period
516 * @ref: kref pointer of the vlan object
517 */
batadv_softif_vlan_release(struct kref * ref)518 void batadv_softif_vlan_release(struct kref *ref)
519 {
520 struct batadv_softif_vlan *vlan;
521
522 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
523
524 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
525 hlist_del_rcu(&vlan->list);
526 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
527
528 kfree_rcu(vlan, rcu);
529 }
530
531 /**
532 * batadv_softif_vlan_get() - get the vlan object for a specific vid
533 * @bat_priv: the bat priv with all the soft interface information
534 * @vid: the identifier of the vlan object to retrieve
535 *
536 * Return: the private data of the vlan matching the vid passed as argument or
537 * NULL otherwise. The refcounter of the returned object is incremented by 1.
538 */
batadv_softif_vlan_get(struct batadv_priv * bat_priv,unsigned short vid)539 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
540 unsigned short vid)
541 {
542 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
543
544 rcu_read_lock();
545 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
546 if (vlan_tmp->vid != vid)
547 continue;
548
549 if (!kref_get_unless_zero(&vlan_tmp->refcount))
550 continue;
551
552 vlan = vlan_tmp;
553 break;
554 }
555 rcu_read_unlock();
556
557 return vlan;
558 }
559
560 /**
561 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
562 * @bat_priv: the bat priv with all the soft interface information
563 * @vid: the VLAN identifier
564 *
565 * Return: 0 on success, a negative error otherwise.
566 */
batadv_softif_create_vlan(struct batadv_priv * bat_priv,unsigned short vid)567 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
568 {
569 struct batadv_softif_vlan *vlan;
570 int err;
571
572 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
573
574 vlan = batadv_softif_vlan_get(bat_priv, vid);
575 if (vlan) {
576 batadv_softif_vlan_put(vlan);
577 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
578 return -EEXIST;
579 }
580
581 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
582 if (!vlan) {
583 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
584 return -ENOMEM;
585 }
586
587 vlan->bat_priv = bat_priv;
588 vlan->vid = vid;
589 kref_init(&vlan->refcount);
590
591 atomic_set(&vlan->ap_isolation, 0);
592
593 kref_get(&vlan->refcount);
594 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
595 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
596
597 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
598 * sleeping behavior of the sysfs functions and the fs_reclaim lock
599 */
600 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
601 if (err) {
602 /* ref for the function */
603 batadv_softif_vlan_put(vlan);
604
605 /* ref for the list */
606 batadv_softif_vlan_put(vlan);
607 return err;
608 }
609
610 /* add a new TT local entry. This one will be marked with the NOPURGE
611 * flag
612 */
613 batadv_tt_local_add(bat_priv->soft_iface,
614 bat_priv->soft_iface->dev_addr, vid,
615 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
616
617 /* don't return reference to new softif_vlan */
618 batadv_softif_vlan_put(vlan);
619
620 return 0;
621 }
622
623 /**
624 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
625 * @bat_priv: the bat priv with all the soft interface information
626 * @vlan: the object to remove
627 */
batadv_softif_destroy_vlan(struct batadv_priv * bat_priv,struct batadv_softif_vlan * vlan)628 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
629 struct batadv_softif_vlan *vlan)
630 {
631 /* explicitly remove the associated TT local entry because it is marked
632 * with the NOPURGE flag
633 */
634 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
635 vlan->vid, "vlan interface destroyed", false);
636
637 batadv_sysfs_del_vlan(bat_priv, vlan);
638 batadv_softif_vlan_put(vlan);
639 }
640
641 /**
642 * batadv_interface_add_vid() - ndo_add_vid API implementation
643 * @dev: the netdev of the mesh interface
644 * @proto: protocol of the vlan id
645 * @vid: identifier of the new vlan
646 *
647 * Set up all the internal structures for handling the new vlan on top of the
648 * mesh interface
649 *
650 * Return: 0 on success or a negative error code in case of failure.
651 */
batadv_interface_add_vid(struct net_device * dev,__be16 proto,unsigned short vid)652 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
653 unsigned short vid)
654 {
655 struct batadv_priv *bat_priv = netdev_priv(dev);
656 struct batadv_softif_vlan *vlan;
657 int ret;
658
659 /* only 802.1Q vlans are supported.
660 * batman-adv does not know how to handle other types
661 */
662 if (proto != htons(ETH_P_8021Q))
663 return -EINVAL;
664
665 vid |= BATADV_VLAN_HAS_TAG;
666
667 /* if a new vlan is getting created and it already exists, it means that
668 * it was not deleted yet. batadv_softif_vlan_get() increases the
669 * refcount in order to revive the object.
670 *
671 * if it does not exist then create it.
672 */
673 vlan = batadv_softif_vlan_get(bat_priv, vid);
674 if (!vlan)
675 return batadv_softif_create_vlan(bat_priv, vid);
676
677 /* recreate the sysfs object if it was already destroyed (and it should
678 * be since we received a kill_vid() for this vlan
679 */
680 if (!vlan->kobj) {
681 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
682 if (ret) {
683 batadv_softif_vlan_put(vlan);
684 return ret;
685 }
686 }
687
688 /* add a new TT local entry. This one will be marked with the NOPURGE
689 * flag. This must be added again, even if the vlan object already
690 * exists, because the entry was deleted by kill_vid()
691 */
692 batadv_tt_local_add(bat_priv->soft_iface,
693 bat_priv->soft_iface->dev_addr, vid,
694 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
695
696 return 0;
697 }
698
699 /**
700 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
701 * @dev: the netdev of the mesh interface
702 * @proto: protocol of the vlan id
703 * @vid: identifier of the deleted vlan
704 *
705 * Destroy all the internal structures used to handle the vlan identified by vid
706 * on top of the mesh interface
707 *
708 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
709 * or -ENOENT if the specified vlan id wasn't registered.
710 */
batadv_interface_kill_vid(struct net_device * dev,__be16 proto,unsigned short vid)711 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
712 unsigned short vid)
713 {
714 struct batadv_priv *bat_priv = netdev_priv(dev);
715 struct batadv_softif_vlan *vlan;
716
717 /* only 802.1Q vlans are supported. batman-adv does not know how to
718 * handle other types
719 */
720 if (proto != htons(ETH_P_8021Q))
721 return -EINVAL;
722
723 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
724 if (!vlan)
725 return -ENOENT;
726
727 batadv_softif_destroy_vlan(bat_priv, vlan);
728
729 /* finally free the vlan object */
730 batadv_softif_vlan_put(vlan);
731
732 return 0;
733 }
734
735 /* batman-adv network devices have devices nesting below it and are a special
736 * "super class" of normal network devices; split their locks off into a
737 * separate class since they always nest.
738 */
739 static struct lock_class_key batadv_netdev_xmit_lock_key;
740 static struct lock_class_key batadv_netdev_addr_lock_key;
741
742 /**
743 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
744 * @dev: device which owns the tx queue
745 * @txq: tx queue to modify
746 * @_unused: always NULL
747 */
batadv_set_lockdep_class_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)748 static void batadv_set_lockdep_class_one(struct net_device *dev,
749 struct netdev_queue *txq,
750 void *_unused)
751 {
752 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
753 }
754
755 /**
756 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
757 * @dev: network device to modify
758 */
batadv_set_lockdep_class(struct net_device * dev)759 static void batadv_set_lockdep_class(struct net_device *dev)
760 {
761 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
762 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
763 }
764
765 /**
766 * batadv_softif_init_late() - late stage initialization of soft interface
767 * @dev: registered network device to modify
768 *
769 * Return: error code on failures
770 */
batadv_softif_init_late(struct net_device * dev)771 static int batadv_softif_init_late(struct net_device *dev)
772 {
773 struct batadv_priv *bat_priv;
774 u32 random_seqno;
775 int ret;
776 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
777
778 batadv_set_lockdep_class(dev);
779
780 bat_priv = netdev_priv(dev);
781 bat_priv->soft_iface = dev;
782
783 /* batadv_interface_stats() needs to be available as soon as
784 * register_netdevice() has been called
785 */
786 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
787 if (!bat_priv->bat_counters)
788 return -ENOMEM;
789
790 atomic_set(&bat_priv->aggregated_ogms, 1);
791 atomic_set(&bat_priv->bonding, 0);
792 #ifdef CONFIG_BATMAN_ADV_BLA
793 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
794 #endif
795 #ifdef CONFIG_BATMAN_ADV_DAT
796 atomic_set(&bat_priv->distributed_arp_table, 1);
797 #endif
798 #ifdef CONFIG_BATMAN_ADV_MCAST
799 atomic_set(&bat_priv->multicast_mode, 1);
800 atomic_set(&bat_priv->multicast_fanout, 16);
801 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
802 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
803 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
804 #endif
805 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
806 atomic_set(&bat_priv->gw.bandwidth_down, 100);
807 atomic_set(&bat_priv->gw.bandwidth_up, 20);
808 atomic_set(&bat_priv->orig_interval, 1000);
809 atomic_set(&bat_priv->hop_penalty, 30);
810 #ifdef CONFIG_BATMAN_ADV_DEBUG
811 atomic_set(&bat_priv->log_level, 0);
812 #endif
813 atomic_set(&bat_priv->fragmentation, 1);
814 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
815 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
816 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
817
818 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
819 atomic_set(&bat_priv->bcast_seqno, 1);
820 atomic_set(&bat_priv->tt.vn, 0);
821 atomic_set(&bat_priv->tt.local_changes, 0);
822 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
823 #ifdef CONFIG_BATMAN_ADV_BLA
824 atomic_set(&bat_priv->bla.num_requests, 0);
825 #endif
826 atomic_set(&bat_priv->tp_num, 0);
827
828 bat_priv->tt.last_changeset = NULL;
829 bat_priv->tt.last_changeset_len = 0;
830 bat_priv->isolation_mark = 0;
831 bat_priv->isolation_mark_mask = 0;
832
833 /* randomize initial seqno to avoid collision */
834 get_random_bytes(&random_seqno, sizeof(random_seqno));
835 atomic_set(&bat_priv->frag_seqno, random_seqno);
836
837 bat_priv->primary_if = NULL;
838
839 batadv_nc_init_bat_priv(bat_priv);
840
841 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
842 if (ret < 0)
843 goto free_bat_counters;
844
845 ret = batadv_debugfs_add_meshif(dev);
846 if (ret < 0)
847 goto free_bat_counters;
848
849 ret = batadv_mesh_init(dev);
850 if (ret < 0)
851 goto unreg_debugfs;
852
853 return 0;
854
855 unreg_debugfs:
856 batadv_debugfs_del_meshif(dev);
857 free_bat_counters:
858 free_percpu(bat_priv->bat_counters);
859 bat_priv->bat_counters = NULL;
860
861 return ret;
862 }
863
864 /**
865 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
866 * @dev: batadv_soft_interface used as master interface
867 * @slave_dev: net_device which should become the slave interface
868 * @extack: extended ACK report struct
869 *
870 * Return: 0 if successful or error otherwise.
871 */
batadv_softif_slave_add(struct net_device * dev,struct net_device * slave_dev,struct netlink_ext_ack * extack)872 static int batadv_softif_slave_add(struct net_device *dev,
873 struct net_device *slave_dev,
874 struct netlink_ext_ack *extack)
875 {
876 struct batadv_hard_iface *hard_iface;
877 struct net *net = dev_net(dev);
878 int ret = -EINVAL;
879
880 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
881 if (!hard_iface || hard_iface->soft_iface)
882 goto out;
883
884 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
885
886 out:
887 if (hard_iface)
888 batadv_hardif_put(hard_iface);
889 return ret;
890 }
891
892 /**
893 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
894 * @dev: batadv_soft_interface used as master interface
895 * @slave_dev: net_device which should be removed from the master interface
896 *
897 * Return: 0 if successful or error otherwise.
898 */
batadv_softif_slave_del(struct net_device * dev,struct net_device * slave_dev)899 static int batadv_softif_slave_del(struct net_device *dev,
900 struct net_device *slave_dev)
901 {
902 struct batadv_hard_iface *hard_iface;
903 int ret = -EINVAL;
904
905 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
906
907 if (!hard_iface || hard_iface->soft_iface != dev)
908 goto out;
909
910 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
911 ret = 0;
912
913 out:
914 if (hard_iface)
915 batadv_hardif_put(hard_iface);
916 return ret;
917 }
918
919 static const struct net_device_ops batadv_netdev_ops = {
920 .ndo_init = batadv_softif_init_late,
921 .ndo_open = batadv_interface_open,
922 .ndo_stop = batadv_interface_release,
923 .ndo_get_stats = batadv_interface_stats,
924 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
925 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
926 .ndo_set_mac_address = batadv_interface_set_mac_addr,
927 .ndo_change_mtu = batadv_interface_change_mtu,
928 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
929 .ndo_start_xmit = batadv_interface_tx,
930 .ndo_validate_addr = eth_validate_addr,
931 .ndo_add_slave = batadv_softif_slave_add,
932 .ndo_del_slave = batadv_softif_slave_del,
933 };
934
batadv_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)935 static void batadv_get_drvinfo(struct net_device *dev,
936 struct ethtool_drvinfo *info)
937 {
938 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
939 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
940 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
941 strscpy(info->bus_info, "batman", sizeof(info->bus_info));
942 }
943
944 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
945 * Declare each description string in struct.name[] to get fixed sized buffer
946 * and compile time checking for strings longer than ETH_GSTRING_LEN.
947 */
948 static const struct {
949 const char name[ETH_GSTRING_LEN];
950 } batadv_counters_strings[] = {
951 { "tx" },
952 { "tx_bytes" },
953 { "tx_dropped" },
954 { "rx" },
955 { "rx_bytes" },
956 { "forward" },
957 { "forward_bytes" },
958 { "mgmt_tx" },
959 { "mgmt_tx_bytes" },
960 { "mgmt_rx" },
961 { "mgmt_rx_bytes" },
962 { "frag_tx" },
963 { "frag_tx_bytes" },
964 { "frag_rx" },
965 { "frag_rx_bytes" },
966 { "frag_fwd" },
967 { "frag_fwd_bytes" },
968 { "tt_request_tx" },
969 { "tt_request_rx" },
970 { "tt_response_tx" },
971 { "tt_response_rx" },
972 { "tt_roam_adv_tx" },
973 { "tt_roam_adv_rx" },
974 #ifdef CONFIG_BATMAN_ADV_DAT
975 { "dat_get_tx" },
976 { "dat_get_rx" },
977 { "dat_put_tx" },
978 { "dat_put_rx" },
979 { "dat_cached_reply_tx" },
980 #endif
981 #ifdef CONFIG_BATMAN_ADV_NC
982 { "nc_code" },
983 { "nc_code_bytes" },
984 { "nc_recode" },
985 { "nc_recode_bytes" },
986 { "nc_buffer" },
987 { "nc_decode" },
988 { "nc_decode_bytes" },
989 { "nc_decode_failed" },
990 { "nc_sniffed" },
991 #endif
992 };
993
batadv_get_strings(struct net_device * dev,u32 stringset,u8 * data)994 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
995 {
996 if (stringset == ETH_SS_STATS)
997 memcpy(data, batadv_counters_strings,
998 sizeof(batadv_counters_strings));
999 }
1000
batadv_get_ethtool_stats(struct net_device * dev,struct ethtool_stats * stats,u64 * data)1001 static void batadv_get_ethtool_stats(struct net_device *dev,
1002 struct ethtool_stats *stats, u64 *data)
1003 {
1004 struct batadv_priv *bat_priv = netdev_priv(dev);
1005 int i;
1006
1007 for (i = 0; i < BATADV_CNT_NUM; i++)
1008 data[i] = batadv_sum_counter(bat_priv, i);
1009 }
1010
batadv_get_sset_count(struct net_device * dev,int stringset)1011 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1012 {
1013 if (stringset == ETH_SS_STATS)
1014 return BATADV_CNT_NUM;
1015
1016 return -EOPNOTSUPP;
1017 }
1018
1019 static const struct ethtool_ops batadv_ethtool_ops = {
1020 .get_drvinfo = batadv_get_drvinfo,
1021 .get_link = ethtool_op_get_link,
1022 .get_strings = batadv_get_strings,
1023 .get_ethtool_stats = batadv_get_ethtool_stats,
1024 .get_sset_count = batadv_get_sset_count,
1025 };
1026
1027 /**
1028 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1029 * @dev: Device to cleanup and remove
1030 */
batadv_softif_free(struct net_device * dev)1031 static void batadv_softif_free(struct net_device *dev)
1032 {
1033 batadv_debugfs_del_meshif(dev);
1034 batadv_mesh_free(dev);
1035
1036 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1037 * their tasks. Wait for them all to be finished before freeing the
1038 * netdev and its private data (bat_priv)
1039 */
1040 rcu_barrier();
1041 }
1042
1043 /**
1044 * batadv_softif_init_early() - early stage initialization of soft interface
1045 * @dev: registered network device to modify
1046 */
batadv_softif_init_early(struct net_device * dev)1047 static void batadv_softif_init_early(struct net_device *dev)
1048 {
1049 ether_setup(dev);
1050
1051 dev->netdev_ops = &batadv_netdev_ops;
1052 dev->needs_free_netdev = true;
1053 dev->priv_destructor = batadv_softif_free;
1054 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1055 dev->features |= NETIF_F_LLTX;
1056 dev->priv_flags |= IFF_NO_QUEUE;
1057
1058 /* can't call min_mtu, because the needed variables
1059 * have not been initialized yet
1060 */
1061 dev->mtu = ETH_DATA_LEN;
1062
1063 /* generate random address */
1064 eth_hw_addr_random(dev);
1065
1066 dev->ethtool_ops = &batadv_ethtool_ops;
1067 }
1068
1069 /**
1070 * batadv_softif_create() - Create and register soft interface
1071 * @net: the applicable net namespace
1072 * @name: name of the new soft interface
1073 *
1074 * Return: newly allocated soft_interface, NULL on errors
1075 */
batadv_softif_create(struct net * net,const char * name)1076 struct net_device *batadv_softif_create(struct net *net, const char *name)
1077 {
1078 struct net_device *soft_iface;
1079 int ret;
1080
1081 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1082 NET_NAME_UNKNOWN, batadv_softif_init_early);
1083 if (!soft_iface)
1084 return NULL;
1085
1086 dev_net_set(soft_iface, net);
1087
1088 soft_iface->rtnl_link_ops = &batadv_link_ops;
1089
1090 ret = register_netdevice(soft_iface);
1091 if (ret < 0) {
1092 pr_err("Unable to register the batman interface '%s': %i\n",
1093 name, ret);
1094 free_netdev(soft_iface);
1095 return NULL;
1096 }
1097
1098 return soft_iface;
1099 }
1100
1101 /**
1102 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1103 * @soft_iface: the to-be-removed batman-adv interface
1104 */
batadv_softif_destroy_sysfs(struct net_device * soft_iface)1105 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1106 {
1107 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1108 struct batadv_softif_vlan *vlan;
1109
1110 ASSERT_RTNL();
1111
1112 /* destroy the "untagged" VLAN */
1113 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1114 if (vlan) {
1115 batadv_softif_destroy_vlan(bat_priv, vlan);
1116 batadv_softif_vlan_put(vlan);
1117 }
1118
1119 batadv_sysfs_del_meshif(soft_iface);
1120 unregister_netdevice(soft_iface);
1121 }
1122
1123 /**
1124 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1125 * netlink
1126 * @soft_iface: the to-be-removed batman-adv interface
1127 * @head: list pointer
1128 */
batadv_softif_destroy_netlink(struct net_device * soft_iface,struct list_head * head)1129 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1130 struct list_head *head)
1131 {
1132 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1133 struct batadv_hard_iface *hard_iface;
1134 struct batadv_softif_vlan *vlan;
1135
1136 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1137 if (hard_iface->soft_iface == soft_iface)
1138 batadv_hardif_disable_interface(hard_iface,
1139 BATADV_IF_CLEANUP_KEEP);
1140 }
1141
1142 /* destroy the "untagged" VLAN */
1143 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1144 if (vlan) {
1145 batadv_softif_destroy_vlan(bat_priv, vlan);
1146 batadv_softif_vlan_put(vlan);
1147 }
1148
1149 batadv_sysfs_del_meshif(soft_iface);
1150 unregister_netdevice_queue(soft_iface, head);
1151 }
1152
1153 /**
1154 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1155 * @net_dev: device which should be checked
1156 *
1157 * Return: true when net_dev is a batman-adv interface, false otherwise
1158 */
batadv_softif_is_valid(const struct net_device * net_dev)1159 bool batadv_softif_is_valid(const struct net_device *net_dev)
1160 {
1161 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1162 return true;
1163
1164 return false;
1165 }
1166
1167 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1168 .kind = "batadv",
1169 .priv_size = sizeof(struct batadv_priv),
1170 .setup = batadv_softif_init_early,
1171 .dellink = batadv_softif_destroy_netlink,
1172 };
1173