1 /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors:
2 *
3 * Marek Lindner, Simon Wunderlich
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include "soft-interface.h"
19 #include "main.h"
20
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/cache.h>
24 #include <linux/compiler.h>
25 #include <linux/errno.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/fs.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_vlan.h>
31 #include <linux/jiffies.h>
32 #include <linux/kernel.h>
33 #include <linux/kref.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/percpu.h>
38 #include <linux/printk.h>
39 #include <linux/random.h>
40 #include <linux/rculist.h>
41 #include <linux/rcupdate.h>
42 #include <linux/rtnetlink.h>
43 #include <linux/skbuff.h>
44 #include <linux/slab.h>
45 #include <linux/socket.h>
46 #include <linux/spinlock.h>
47 #include <linux/stddef.h>
48 #include <linux/string.h>
49 #include <linux/types.h>
50
51 #include "bat_algo.h"
52 #include "bridge_loop_avoidance.h"
53 #include "debugfs.h"
54 #include "distributed-arp-table.h"
55 #include "gateway_client.h"
56 #include "gateway_common.h"
57 #include "hard-interface.h"
58 #include "multicast.h"
59 #include "network-coding.h"
60 #include "originator.h"
61 #include "packet.h"
62 #include "send.h"
63 #include "sysfs.h"
64 #include "translation-table.h"
65
66 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
67 static void batadv_get_drvinfo(struct net_device *dev,
68 struct ethtool_drvinfo *info);
69 static u32 batadv_get_msglevel(struct net_device *dev);
70 static void batadv_set_msglevel(struct net_device *dev, u32 value);
71 static u32 batadv_get_link(struct net_device *dev);
72 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
73 static void batadv_get_ethtool_stats(struct net_device *dev,
74 struct ethtool_stats *stats, u64 *data);
75 static int batadv_get_sset_count(struct net_device *dev, int stringset);
76
77 static const struct ethtool_ops batadv_ethtool_ops = {
78 .get_settings = batadv_get_settings,
79 .get_drvinfo = batadv_get_drvinfo,
80 .get_msglevel = batadv_get_msglevel,
81 .set_msglevel = batadv_set_msglevel,
82 .get_link = batadv_get_link,
83 .get_strings = batadv_get_strings,
84 .get_ethtool_stats = batadv_get_ethtool_stats,
85 .get_sset_count = batadv_get_sset_count,
86 };
87
batadv_skb_head_push(struct sk_buff * skb,unsigned int len)88 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
89 {
90 int result;
91
92 /* TODO: We must check if we can release all references to non-payload
93 * data using skb_header_release in our skbs to allow skb_cow_header to
94 * work optimally. This means that those skbs are not allowed to read
95 * or write any data which is before the current position of skb->data
96 * after that call and thus allow other skbs with the same data buffer
97 * to write freely in that area.
98 */
99 result = skb_cow_head(skb, len);
100 if (result < 0)
101 return result;
102
103 skb_push(skb, len);
104 return 0;
105 }
106
batadv_interface_open(struct net_device * dev)107 static int batadv_interface_open(struct net_device *dev)
108 {
109 netif_start_queue(dev);
110 return 0;
111 }
112
batadv_interface_release(struct net_device * dev)113 static int batadv_interface_release(struct net_device *dev)
114 {
115 netif_stop_queue(dev);
116 return 0;
117 }
118
batadv_interface_stats(struct net_device * dev)119 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
120 {
121 struct batadv_priv *bat_priv = netdev_priv(dev);
122 struct net_device_stats *stats = &bat_priv->stats;
123
124 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
125 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
126 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
127 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
128 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
129 return stats;
130 }
131
batadv_interface_set_mac_addr(struct net_device * dev,void * p)132 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
133 {
134 struct batadv_priv *bat_priv = netdev_priv(dev);
135 struct batadv_softif_vlan *vlan;
136 struct sockaddr *addr = p;
137 u8 old_addr[ETH_ALEN];
138
139 if (!is_valid_ether_addr(addr->sa_data))
140 return -EADDRNOTAVAIL;
141
142 ether_addr_copy(old_addr, dev->dev_addr);
143 ether_addr_copy(dev->dev_addr, addr->sa_data);
144
145 /* only modify transtable if it has been initialized before */
146 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
147 return 0;
148
149 rcu_read_lock();
150 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
151 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
152 "mac address changed", false);
153 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
154 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
155 }
156 rcu_read_unlock();
157
158 return 0;
159 }
160
batadv_interface_change_mtu(struct net_device * dev,int new_mtu)161 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
162 {
163 /* check ranges */
164 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
165 return -EINVAL;
166
167 dev->mtu = new_mtu;
168
169 return 0;
170 }
171
172 /**
173 * batadv_interface_set_rx_mode - set the rx mode of a device
174 * @dev: registered network device to modify
175 *
176 * We do not actually need to set any rx filters for the virtual batman
177 * soft interface. However a dummy handler enables a user to set static
178 * multicast listeners for instance.
179 */
batadv_interface_set_rx_mode(struct net_device * dev)180 static void batadv_interface_set_rx_mode(struct net_device *dev)
181 {
182 }
183
batadv_interface_tx(struct sk_buff * skb,struct net_device * soft_iface)184 static int batadv_interface_tx(struct sk_buff *skb,
185 struct net_device *soft_iface)
186 {
187 struct ethhdr *ethhdr;
188 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
189 struct batadv_hard_iface *primary_if = NULL;
190 struct batadv_bcast_packet *bcast_packet;
191 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
192 0x00, 0x00};
193 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
194 0x00, 0x00};
195 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
196 u8 *dst_hint = NULL, chaddr[ETH_ALEN];
197 struct vlan_ethhdr *vhdr;
198 unsigned int header_len = 0;
199 int data_len = skb->len, ret;
200 unsigned long brd_delay = 1;
201 bool do_bcast = false, client_added;
202 unsigned short vid;
203 u32 seqno;
204 int gw_mode;
205 enum batadv_forw_mode forw_mode;
206 struct batadv_orig_node *mcast_single_orig = NULL;
207 int network_offset = ETH_HLEN;
208
209 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
210 goto dropped;
211
212 netif_trans_update(soft_iface);
213 vid = batadv_get_vid(skb, 0);
214 ethhdr = eth_hdr(skb);
215
216 switch (ntohs(ethhdr->h_proto)) {
217 case ETH_P_8021Q:
218 vhdr = vlan_eth_hdr(skb);
219
220 /* drop batman-in-batman packets to prevent loops */
221 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
222 network_offset += VLAN_HLEN;
223 break;
224 }
225
226 /* fall through */
227 case ETH_P_BATMAN:
228 goto dropped;
229 }
230
231 skb_set_network_header(skb, network_offset);
232
233 if (batadv_bla_tx(bat_priv, skb, vid))
234 goto dropped;
235
236 /* skb->data might have been reallocated by batadv_bla_tx() */
237 ethhdr = eth_hdr(skb);
238
239 /* Register the client MAC in the transtable */
240 if (!is_multicast_ether_addr(ethhdr->h_source)) {
241 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
242 vid, skb->skb_iif,
243 skb->mark);
244 if (!client_added)
245 goto dropped;
246 }
247
248 /* don't accept stp packets. STP does not help in meshes.
249 * better use the bridge loop avoidance ...
250 *
251 * The same goes for ECTP sent at least by some Cisco Switches,
252 * it might confuse the mesh when used with bridge loop avoidance.
253 */
254 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
255 goto dropped;
256
257 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
258 goto dropped;
259
260 gw_mode = atomic_read(&bat_priv->gw.mode);
261 if (is_multicast_ether_addr(ethhdr->h_dest)) {
262 /* if gw mode is off, broadcast every packet */
263 if (gw_mode == BATADV_GW_MODE_OFF) {
264 do_bcast = true;
265 goto send;
266 }
267
268 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
269 chaddr);
270 /* skb->data may have been modified by
271 * batadv_gw_dhcp_recipient_get()
272 */
273 ethhdr = eth_hdr(skb);
274 /* if gw_mode is on, broadcast any non-DHCP message.
275 * All the DHCP packets are going to be sent as unicast
276 */
277 if (dhcp_rcp == BATADV_DHCP_NO) {
278 do_bcast = true;
279 goto send;
280 }
281
282 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
283 dst_hint = chaddr;
284 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
285 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
286 /* gateways should not forward any DHCP message if
287 * directed to a DHCP server
288 */
289 goto dropped;
290
291 send:
292 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
293 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
294 &mcast_single_orig);
295 if (forw_mode == BATADV_FORW_NONE)
296 goto dropped;
297
298 if (forw_mode == BATADV_FORW_SINGLE)
299 do_bcast = false;
300 }
301 }
302
303 batadv_skb_set_priority(skb, 0);
304
305 /* ethernet packet should be broadcasted */
306 if (do_bcast) {
307 primary_if = batadv_primary_if_get_selected(bat_priv);
308 if (!primary_if)
309 goto dropped;
310
311 /* in case of ARP request, we do not immediately broadcasti the
312 * packet, instead we first wait for DAT to try to retrieve the
313 * correct ARP entry
314 */
315 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
316 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
317
318 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
319 goto dropped;
320
321 bcast_packet = (struct batadv_bcast_packet *)skb->data;
322 bcast_packet->version = BATADV_COMPAT_VERSION;
323 bcast_packet->ttl = BATADV_TTL;
324
325 /* batman packet type: broadcast */
326 bcast_packet->packet_type = BATADV_BCAST;
327 bcast_packet->reserved = 0;
328
329 /* hw address of first interface is the orig mac because only
330 * this mac is known throughout the mesh
331 */
332 ether_addr_copy(bcast_packet->orig,
333 primary_if->net_dev->dev_addr);
334
335 /* set broadcast sequence number */
336 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
337 bcast_packet->seqno = htonl(seqno);
338
339 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
340
341 /* a copy is stored in the bcast list, therefore removing
342 * the original skb.
343 */
344 kfree_skb(skb);
345
346 /* unicast packet */
347 } else {
348 /* DHCP packets going to a server will use the GW feature */
349 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
350 ret = batadv_gw_out_of_range(bat_priv, skb);
351 if (ret)
352 goto dropped;
353 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
354 } else if (mcast_single_orig) {
355 ret = batadv_send_skb_unicast(bat_priv, skb,
356 BATADV_UNICAST, 0,
357 mcast_single_orig, vid);
358 } else {
359 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
360 skb))
361 goto dropped;
362
363 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
364
365 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
366 vid);
367 }
368 if (ret == NET_XMIT_DROP)
369 goto dropped_freed;
370 }
371
372 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
373 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
374 goto end;
375
376 dropped:
377 kfree_skb(skb);
378 dropped_freed:
379 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
380 end:
381 if (mcast_single_orig)
382 batadv_orig_node_put(mcast_single_orig);
383 if (primary_if)
384 batadv_hardif_put(primary_if);
385 return NETDEV_TX_OK;
386 }
387
388 /**
389 * batadv_interface_rx - receive ethernet frame on local batman-adv interface
390 * @soft_iface: local interface which will receive the ethernet frame
391 * @skb: ethernet frame for @soft_iface
392 * @hdr_size: size of already parsed batman-adv header
393 * @orig_node: originator from which the batman-adv packet was sent
394 *
395 * Sends a ethernet frame to the receive path of the local @soft_iface.
396 * skb->data has still point to the batman-adv header with the size @hdr_size.
397 * The caller has to have parsed this header already and made sure that at least
398 * @hdr_size bytes are still available for pull in @skb.
399 *
400 * The packet may still get dropped. This can happen when the encapsulated
401 * ethernet frame is invalid or contains again an batman-adv packet. Also
402 * unicast packets will be dropped directly when it was sent between two
403 * isolated clients.
404 */
batadv_interface_rx(struct net_device * soft_iface,struct sk_buff * skb,int hdr_size,struct batadv_orig_node * orig_node)405 void batadv_interface_rx(struct net_device *soft_iface,
406 struct sk_buff *skb, int hdr_size,
407 struct batadv_orig_node *orig_node)
408 {
409 struct batadv_bcast_packet *batadv_bcast_packet;
410 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
411 struct vlan_ethhdr *vhdr;
412 struct ethhdr *ethhdr;
413 unsigned short vid;
414 bool is_bcast;
415
416 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
417 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
418
419 skb_pull_rcsum(skb, hdr_size);
420 skb_reset_mac_header(skb);
421
422 /* clean the netfilter state now that the batman-adv header has been
423 * removed
424 */
425 nf_reset(skb);
426
427 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
428 goto dropped;
429
430 vid = batadv_get_vid(skb, 0);
431 ethhdr = eth_hdr(skb);
432
433 switch (ntohs(ethhdr->h_proto)) {
434 case ETH_P_8021Q:
435 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
436 goto dropped;
437
438 vhdr = (struct vlan_ethhdr *)skb->data;
439
440 /* drop batman-in-batman packets to prevent loops */
441 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
442 break;
443
444 /* fall through */
445 case ETH_P_BATMAN:
446 goto dropped;
447 }
448
449 /* skb->dev & skb->pkt_type are set here */
450 skb->protocol = eth_type_trans(skb, soft_iface);
451
452 /* should not be necessary anymore as we use skb_pull_rcsum()
453 * TODO: please verify this and remove this TODO
454 * -- Dec 21st 2009, Simon Wunderlich
455 */
456
457 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
458
459 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
460 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
461 skb->len + ETH_HLEN);
462
463 soft_iface->last_rx = jiffies;
464
465 /* Let the bridge loop avoidance check the packet. If will
466 * not handle it, we can safely push it up.
467 */
468 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
469 goto out;
470
471 if (orig_node)
472 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
473 ethhdr->h_source, vid);
474
475 if (is_multicast_ether_addr(ethhdr->h_dest)) {
476 /* set the mark on broadcast packets if AP isolation is ON and
477 * the packet is coming from an "isolated" client
478 */
479 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
480 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
481 vid)) {
482 /* save bits in skb->mark not covered by the mask and
483 * apply the mark on the rest
484 */
485 skb->mark &= ~bat_priv->isolation_mark_mask;
486 skb->mark |= bat_priv->isolation_mark;
487 }
488 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
489 ethhdr->h_dest, vid)) {
490 goto dropped;
491 }
492
493 netif_rx(skb);
494 goto out;
495
496 dropped:
497 kfree_skb(skb);
498 out:
499 return;
500 }
501
502 /**
503 * batadv_softif_vlan_release - release vlan from lists and queue for free after
504 * rcu grace period
505 * @ref: kref pointer of the vlan object
506 */
batadv_softif_vlan_release(struct kref * ref)507 static void batadv_softif_vlan_release(struct kref *ref)
508 {
509 struct batadv_softif_vlan *vlan;
510
511 vlan = container_of(ref, struct batadv_softif_vlan, refcount);
512
513 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
514 hlist_del_rcu(&vlan->list);
515 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
516
517 kfree_rcu(vlan, rcu);
518 }
519
520 /**
521 * batadv_softif_vlan_put - decrease the vlan object refcounter and
522 * possibly release it
523 * @vlan: the vlan object to release
524 */
batadv_softif_vlan_put(struct batadv_softif_vlan * vlan)525 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
526 {
527 if (!vlan)
528 return;
529
530 kref_put(&vlan->refcount, batadv_softif_vlan_release);
531 }
532
533 /**
534 * batadv_softif_vlan_get - get the vlan object for a specific vid
535 * @bat_priv: the bat priv with all the soft interface information
536 * @vid: the identifier of the vlan object to retrieve
537 *
538 * Return: the private data of the vlan matching the vid passed as argument or
539 * NULL otherwise. The refcounter of the returned object is incremented by 1.
540 */
batadv_softif_vlan_get(struct batadv_priv * bat_priv,unsigned short vid)541 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
542 unsigned short vid)
543 {
544 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
545
546 rcu_read_lock();
547 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
548 if (vlan_tmp->vid != vid)
549 continue;
550
551 if (!kref_get_unless_zero(&vlan_tmp->refcount))
552 continue;
553
554 vlan = vlan_tmp;
555 break;
556 }
557 rcu_read_unlock();
558
559 return vlan;
560 }
561
562 /**
563 * batadv_softif_create_vlan - allocate the needed resources for a new vlan
564 * @bat_priv: the bat priv with all the soft interface information
565 * @vid: the VLAN identifier
566 *
567 * Return: 0 on success, a negative error otherwise.
568 */
batadv_softif_create_vlan(struct batadv_priv * bat_priv,unsigned short vid)569 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
570 {
571 struct batadv_softif_vlan *vlan;
572 int err;
573
574 vlan = batadv_softif_vlan_get(bat_priv, vid);
575 if (vlan) {
576 batadv_softif_vlan_put(vlan);
577 return -EEXIST;
578 }
579
580 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
581 if (!vlan)
582 return -ENOMEM;
583
584 vlan->bat_priv = bat_priv;
585 vlan->vid = vid;
586 kref_init(&vlan->refcount);
587
588 atomic_set(&vlan->ap_isolation, 0);
589
590 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
591 if (err) {
592 kfree(vlan);
593 return err;
594 }
595
596 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
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 */
batadv_softif_destroy_vlan(struct batadv_priv * bat_priv,struct batadv_softif_vlan * vlan)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_sysfs_del_vlan(bat_priv, vlan);
629 batadv_softif_vlan_put(vlan);
630 }
631
632 /**
633 * batadv_interface_add_vid - ndo_add_vid API implementation
634 * @dev: the netdev of the mesh interface
635 * @proto: protocol of the the vlan id
636 * @vid: identifier of the new vlan
637 *
638 * Set up all the internal structures for handling the new vlan on top of the
639 * mesh interface
640 *
641 * Return: 0 on success or a negative error code in case of failure.
642 */
batadv_interface_add_vid(struct net_device * dev,__be16 proto,unsigned short vid)643 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
644 unsigned short vid)
645 {
646 struct batadv_priv *bat_priv = netdev_priv(dev);
647 struct batadv_softif_vlan *vlan;
648 int ret;
649
650 /* only 802.1Q vlans are supported.
651 * batman-adv does not know how to handle other types
652 */
653 if (proto != htons(ETH_P_8021Q))
654 return -EINVAL;
655
656 vid |= BATADV_VLAN_HAS_TAG;
657
658 /* if a new vlan is getting created and it already exists, it means that
659 * it was not deleted yet. batadv_softif_vlan_get() increases the
660 * refcount in order to revive the object.
661 *
662 * if it does not exist then create it.
663 */
664 vlan = batadv_softif_vlan_get(bat_priv, vid);
665 if (!vlan)
666 return batadv_softif_create_vlan(bat_priv, vid);
667
668 /* recreate the sysfs object if it was already destroyed (and it should
669 * be since we received a kill_vid() for this vlan
670 */
671 if (!vlan->kobj) {
672 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
673 if (ret) {
674 batadv_softif_vlan_put(vlan);
675 return ret;
676 }
677 }
678
679 /* add a new TT local entry. This one will be marked with the NOPURGE
680 * flag. This must be added again, even if the vlan object already
681 * exists, because the entry was deleted by kill_vid()
682 */
683 batadv_tt_local_add(bat_priv->soft_iface,
684 bat_priv->soft_iface->dev_addr, vid,
685 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
686
687 return 0;
688 }
689
690 /**
691 * batadv_interface_kill_vid - ndo_kill_vid API implementation
692 * @dev: the netdev of the mesh interface
693 * @proto: protocol of the the vlan id
694 * @vid: identifier of the deleted vlan
695 *
696 * Destroy all the internal structures used to handle the vlan identified by vid
697 * on top of the mesh interface
698 *
699 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
700 * or -ENOENT if the specified vlan id wasn't registered.
701 */
batadv_interface_kill_vid(struct net_device * dev,__be16 proto,unsigned short vid)702 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
703 unsigned short vid)
704 {
705 struct batadv_priv *bat_priv = netdev_priv(dev);
706 struct batadv_softif_vlan *vlan;
707
708 /* only 802.1Q vlans are supported. batman-adv does not know how to
709 * handle other types
710 */
711 if (proto != htons(ETH_P_8021Q))
712 return -EINVAL;
713
714 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
715 if (!vlan)
716 return -ENOENT;
717
718 batadv_softif_destroy_vlan(bat_priv, vlan);
719
720 /* finally free the vlan object */
721 batadv_softif_vlan_put(vlan);
722
723 return 0;
724 }
725
726 /* batman-adv network devices have devices nesting below it and are a special
727 * "super class" of normal network devices; split their locks off into a
728 * separate class since they always nest.
729 */
730 static struct lock_class_key batadv_netdev_xmit_lock_key;
731 static struct lock_class_key batadv_netdev_addr_lock_key;
732
733 /**
734 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
735 * @dev: device which owns the tx queue
736 * @txq: tx queue to modify
737 * @_unused: always NULL
738 */
batadv_set_lockdep_class_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)739 static void batadv_set_lockdep_class_one(struct net_device *dev,
740 struct netdev_queue *txq,
741 void *_unused)
742 {
743 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
744 }
745
746 /**
747 * batadv_set_lockdep_class - Set txq and addr_list lockdep class
748 * @dev: network device to modify
749 */
batadv_set_lockdep_class(struct net_device * dev)750 static void batadv_set_lockdep_class(struct net_device *dev)
751 {
752 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
753 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
754 }
755
756 /**
757 * batadv_softif_init_late - late stage initialization of soft interface
758 * @dev: registered network device to modify
759 *
760 * Return: error code on failures
761 */
batadv_softif_init_late(struct net_device * dev)762 static int batadv_softif_init_late(struct net_device *dev)
763 {
764 struct batadv_priv *bat_priv;
765 u32 random_seqno;
766 int ret;
767 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
768
769 batadv_set_lockdep_class(dev);
770
771 bat_priv = netdev_priv(dev);
772 bat_priv->soft_iface = dev;
773
774 /* batadv_interface_stats() needs to be available as soon as
775 * register_netdevice() has been called
776 */
777 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
778 if (!bat_priv->bat_counters)
779 return -ENOMEM;
780
781 atomic_set(&bat_priv->aggregated_ogms, 1);
782 atomic_set(&bat_priv->bonding, 0);
783 #ifdef CONFIG_BATMAN_ADV_BLA
784 atomic_set(&bat_priv->bridge_loop_avoidance, 1);
785 #endif
786 #ifdef CONFIG_BATMAN_ADV_DAT
787 atomic_set(&bat_priv->distributed_arp_table, 1);
788 #endif
789 #ifdef CONFIG_BATMAN_ADV_MCAST
790 bat_priv->mcast.querier_ipv4.exists = false;
791 bat_priv->mcast.querier_ipv4.shadowing = false;
792 bat_priv->mcast.querier_ipv6.exists = false;
793 bat_priv->mcast.querier_ipv6.shadowing = false;
794 bat_priv->mcast.flags = BATADV_NO_FLAGS;
795 atomic_set(&bat_priv->multicast_mode, 1);
796 atomic_set(&bat_priv->mcast.num_disabled, 0);
797 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
798 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
799 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
800 #endif
801 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
802 atomic_set(&bat_priv->gw.sel_class, 20);
803 atomic_set(&bat_priv->gw.bandwidth_down, 100);
804 atomic_set(&bat_priv->gw.bandwidth_up, 20);
805 atomic_set(&bat_priv->orig_interval, 1000);
806 atomic_set(&bat_priv->hop_penalty, 30);
807 #ifdef CONFIG_BATMAN_ADV_DEBUG
808 atomic_set(&bat_priv->log_level, 0);
809 #endif
810 atomic_set(&bat_priv->fragmentation, 1);
811 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
812 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
813 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
814
815 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
816 atomic_set(&bat_priv->bcast_seqno, 1);
817 atomic_set(&bat_priv->tt.vn, 0);
818 atomic_set(&bat_priv->tt.local_changes, 0);
819 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
820 #ifdef CONFIG_BATMAN_ADV_BLA
821 atomic_set(&bat_priv->bla.num_requests, 0);
822 #endif
823 atomic_set(&bat_priv->tp_num, 0);
824
825 bat_priv->tt.last_changeset = NULL;
826 bat_priv->tt.last_changeset_len = 0;
827 bat_priv->isolation_mark = 0;
828 bat_priv->isolation_mark_mask = 0;
829
830 /* randomize initial seqno to avoid collision */
831 get_random_bytes(&random_seqno, sizeof(random_seqno));
832 atomic_set(&bat_priv->frag_seqno, random_seqno);
833
834 bat_priv->primary_if = NULL;
835 bat_priv->num_ifaces = 0;
836
837 batadv_nc_init_bat_priv(bat_priv);
838
839 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
840 if (ret < 0)
841 goto free_bat_counters;
842
843 ret = batadv_debugfs_add_meshif(dev);
844 if (ret < 0)
845 goto free_bat_counters;
846
847 ret = batadv_mesh_init(dev);
848 if (ret < 0)
849 goto unreg_debugfs;
850
851 return 0;
852
853 unreg_debugfs:
854 batadv_debugfs_del_meshif(dev);
855 free_bat_counters:
856 free_percpu(bat_priv->bat_counters);
857 bat_priv->bat_counters = NULL;
858
859 return ret;
860 }
861
862 /**
863 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
864 * @dev: batadv_soft_interface used as master interface
865 * @slave_dev: net_device which should become the slave interface
866 *
867 * Return: 0 if successful or error otherwise.
868 */
batadv_softif_slave_add(struct net_device * dev,struct net_device * slave_dev)869 static int batadv_softif_slave_add(struct net_device *dev,
870 struct net_device *slave_dev)
871 {
872 struct batadv_hard_iface *hard_iface;
873 struct net *net = dev_net(dev);
874 int ret = -EINVAL;
875
876 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
877 if (!hard_iface || hard_iface->soft_iface)
878 goto out;
879
880 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
881
882 out:
883 if (hard_iface)
884 batadv_hardif_put(hard_iface);
885 return ret;
886 }
887
888 /**
889 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
890 * @dev: batadv_soft_interface used as master interface
891 * @slave_dev: net_device which should be removed from the master interface
892 *
893 * Return: 0 if successful or error otherwise.
894 */
batadv_softif_slave_del(struct net_device * dev,struct net_device * slave_dev)895 static int batadv_softif_slave_del(struct net_device *dev,
896 struct net_device *slave_dev)
897 {
898 struct batadv_hard_iface *hard_iface;
899 int ret = -EINVAL;
900
901 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
902
903 if (!hard_iface || hard_iface->soft_iface != dev)
904 goto out;
905
906 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
907 ret = 0;
908
909 out:
910 if (hard_iface)
911 batadv_hardif_put(hard_iface);
912 return ret;
913 }
914
915 static const struct net_device_ops batadv_netdev_ops = {
916 .ndo_init = batadv_softif_init_late,
917 .ndo_open = batadv_interface_open,
918 .ndo_stop = batadv_interface_release,
919 .ndo_get_stats = batadv_interface_stats,
920 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
921 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
922 .ndo_set_mac_address = batadv_interface_set_mac_addr,
923 .ndo_change_mtu = batadv_interface_change_mtu,
924 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
925 .ndo_start_xmit = batadv_interface_tx,
926 .ndo_validate_addr = eth_validate_addr,
927 .ndo_add_slave = batadv_softif_slave_add,
928 .ndo_del_slave = batadv_softif_slave_del,
929 };
930
931 /**
932 * batadv_softif_free - Deconstructor of batadv_soft_interface
933 * @dev: Device to cleanup and remove
934 */
batadv_softif_free(struct net_device * dev)935 static void batadv_softif_free(struct net_device *dev)
936 {
937 batadv_debugfs_del_meshif(dev);
938 batadv_mesh_free(dev);
939
940 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
941 * their tasks. Wait for them all to be finished before freeing the
942 * netdev and its private data (bat_priv)
943 */
944 rcu_barrier();
945
946 free_netdev(dev);
947 }
948
949 /**
950 * batadv_softif_init_early - early stage initialization of soft interface
951 * @dev: registered network device to modify
952 */
batadv_softif_init_early(struct net_device * dev)953 static void batadv_softif_init_early(struct net_device *dev)
954 {
955 struct batadv_priv *priv = netdev_priv(dev);
956
957 ether_setup(dev);
958
959 dev->netdev_ops = &batadv_netdev_ops;
960 dev->destructor = batadv_softif_free;
961 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
962 dev->priv_flags |= IFF_NO_QUEUE;
963
964 /* can't call min_mtu, because the needed variables
965 * have not been initialized yet
966 */
967 dev->mtu = ETH_DATA_LEN;
968
969 /* generate random address */
970 eth_hw_addr_random(dev);
971
972 dev->ethtool_ops = &batadv_ethtool_ops;
973
974 memset(priv, 0, sizeof(*priv));
975 }
976
batadv_softif_create(struct net * net,const char * name)977 struct net_device *batadv_softif_create(struct net *net, const char *name)
978 {
979 struct net_device *soft_iface;
980 int ret;
981
982 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
983 NET_NAME_UNKNOWN, batadv_softif_init_early);
984 if (!soft_iface)
985 return NULL;
986
987 dev_net_set(soft_iface, net);
988
989 soft_iface->rtnl_link_ops = &batadv_link_ops;
990
991 ret = register_netdevice(soft_iface);
992 if (ret < 0) {
993 pr_err("Unable to register the batman interface '%s': %i\n",
994 name, ret);
995 free_netdev(soft_iface);
996 return NULL;
997 }
998
999 return soft_iface;
1000 }
1001
1002 /**
1003 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
1004 * @soft_iface: the to-be-removed batman-adv interface
1005 */
batadv_softif_destroy_sysfs(struct net_device * soft_iface)1006 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1007 {
1008 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1009 struct batadv_softif_vlan *vlan;
1010
1011 ASSERT_RTNL();
1012
1013 /* destroy the "untagged" VLAN */
1014 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1015 if (vlan) {
1016 batadv_softif_destroy_vlan(bat_priv, vlan);
1017 batadv_softif_vlan_put(vlan);
1018 }
1019
1020 batadv_sysfs_del_meshif(soft_iface);
1021 unregister_netdevice(soft_iface);
1022 }
1023
1024 /**
1025 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
1026 * @soft_iface: the to-be-removed batman-adv interface
1027 * @head: list pointer
1028 */
batadv_softif_destroy_netlink(struct net_device * soft_iface,struct list_head * head)1029 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1030 struct list_head *head)
1031 {
1032 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1033 struct batadv_hard_iface *hard_iface;
1034 struct batadv_softif_vlan *vlan;
1035
1036 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1037 if (hard_iface->soft_iface == soft_iface)
1038 batadv_hardif_disable_interface(hard_iface,
1039 BATADV_IF_CLEANUP_KEEP);
1040 }
1041
1042 /* destroy the "untagged" VLAN */
1043 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1044 if (vlan) {
1045 batadv_softif_destroy_vlan(bat_priv, vlan);
1046 batadv_softif_vlan_put(vlan);
1047 }
1048
1049 batadv_sysfs_del_meshif(soft_iface);
1050 unregister_netdevice_queue(soft_iface, head);
1051 }
1052
batadv_softif_is_valid(const struct net_device * net_dev)1053 bool batadv_softif_is_valid(const struct net_device *net_dev)
1054 {
1055 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1056 return true;
1057
1058 return false;
1059 }
1060
1061 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1062 .kind = "batadv",
1063 .priv_size = sizeof(struct batadv_priv),
1064 .setup = batadv_softif_init_early,
1065 .dellink = batadv_softif_destroy_netlink,
1066 };
1067
1068 /* ethtool */
batadv_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)1069 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1070 {
1071 cmd->supported = 0;
1072 cmd->advertising = 0;
1073 ethtool_cmd_speed_set(cmd, SPEED_10);
1074 cmd->duplex = DUPLEX_FULL;
1075 cmd->port = PORT_TP;
1076 cmd->phy_address = 0;
1077 cmd->transceiver = XCVR_INTERNAL;
1078 cmd->autoneg = AUTONEG_DISABLE;
1079 cmd->maxtxpkt = 0;
1080 cmd->maxrxpkt = 0;
1081
1082 return 0;
1083 }
1084
batadv_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1085 static void batadv_get_drvinfo(struct net_device *dev,
1086 struct ethtool_drvinfo *info)
1087 {
1088 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1089 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1090 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1091 strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1092 }
1093
batadv_get_msglevel(struct net_device * dev)1094 static u32 batadv_get_msglevel(struct net_device *dev)
1095 {
1096 return -EOPNOTSUPP;
1097 }
1098
batadv_set_msglevel(struct net_device * dev,u32 value)1099 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1100 {
1101 }
1102
batadv_get_link(struct net_device * dev)1103 static u32 batadv_get_link(struct net_device *dev)
1104 {
1105 return 1;
1106 }
1107
1108 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1109 * Declare each description string in struct.name[] to get fixed sized buffer
1110 * and compile time checking for strings longer than ETH_GSTRING_LEN.
1111 */
1112 static const struct {
1113 const char name[ETH_GSTRING_LEN];
1114 } batadv_counters_strings[] = {
1115 { "tx" },
1116 { "tx_bytes" },
1117 { "tx_dropped" },
1118 { "rx" },
1119 { "rx_bytes" },
1120 { "forward" },
1121 { "forward_bytes" },
1122 { "mgmt_tx" },
1123 { "mgmt_tx_bytes" },
1124 { "mgmt_rx" },
1125 { "mgmt_rx_bytes" },
1126 { "frag_tx" },
1127 { "frag_tx_bytes" },
1128 { "frag_rx" },
1129 { "frag_rx_bytes" },
1130 { "frag_fwd" },
1131 { "frag_fwd_bytes" },
1132 { "tt_request_tx" },
1133 { "tt_request_rx" },
1134 { "tt_response_tx" },
1135 { "tt_response_rx" },
1136 { "tt_roam_adv_tx" },
1137 { "tt_roam_adv_rx" },
1138 #ifdef CONFIG_BATMAN_ADV_DAT
1139 { "dat_get_tx" },
1140 { "dat_get_rx" },
1141 { "dat_put_tx" },
1142 { "dat_put_rx" },
1143 { "dat_cached_reply_tx" },
1144 #endif
1145 #ifdef CONFIG_BATMAN_ADV_NC
1146 { "nc_code" },
1147 { "nc_code_bytes" },
1148 { "nc_recode" },
1149 { "nc_recode_bytes" },
1150 { "nc_buffer" },
1151 { "nc_decode" },
1152 { "nc_decode_bytes" },
1153 { "nc_decode_failed" },
1154 { "nc_sniffed" },
1155 #endif
1156 };
1157
batadv_get_strings(struct net_device * dev,u32 stringset,u8 * data)1158 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1159 {
1160 if (stringset == ETH_SS_STATS)
1161 memcpy(data, batadv_counters_strings,
1162 sizeof(batadv_counters_strings));
1163 }
1164
batadv_get_ethtool_stats(struct net_device * dev,struct ethtool_stats * stats,u64 * data)1165 static void batadv_get_ethtool_stats(struct net_device *dev,
1166 struct ethtool_stats *stats, u64 *data)
1167 {
1168 struct batadv_priv *bat_priv = netdev_priv(dev);
1169 int i;
1170
1171 for (i = 0; i < BATADV_CNT_NUM; i++)
1172 data[i] = batadv_sum_counter(bat_priv, i);
1173 }
1174
batadv_get_sset_count(struct net_device * dev,int stringset)1175 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1176 {
1177 if (stringset == ETH_SS_STATS)
1178 return BATADV_CNT_NUM;
1179
1180 return -EOPNOTSUPP;
1181 }
1182