1 /*
2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #include "main.h"
23 #include "soft-interface.h"
24 #include "hard-interface.h"
25 #include "routing.h"
26 #include "send.h"
27 #include "bat_debugfs.h"
28 #include "translation-table.h"
29 #include "hash.h"
30 #include "gateway_common.h"
31 #include "gateway_client.h"
32 #include "bat_sysfs.h"
33 #include "originator.h"
34 #include <linux/slab.h>
35 #include <linux/ethtool.h>
36 #include <linux/etherdevice.h>
37 #include <linux/if_vlan.h>
38 #include "unicast.h"
39
40
41 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
42 static void bat_get_drvinfo(struct net_device *dev,
43 struct ethtool_drvinfo *info);
44 static u32 bat_get_msglevel(struct net_device *dev);
45 static void bat_set_msglevel(struct net_device *dev, u32 value);
46 static u32 bat_get_link(struct net_device *dev);
47
48 static const struct ethtool_ops bat_ethtool_ops = {
49 .get_settings = bat_get_settings,
50 .get_drvinfo = bat_get_drvinfo,
51 .get_msglevel = bat_get_msglevel,
52 .set_msglevel = bat_set_msglevel,
53 .get_link = bat_get_link,
54 };
55
my_skb_head_push(struct sk_buff * skb,unsigned int len)56 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
57 {
58 int result;
59
60 /**
61 * TODO: We must check if we can release all references to non-payload
62 * data using skb_header_release in our skbs to allow skb_cow_header to
63 * work optimally. This means that those skbs are not allowed to read
64 * or write any data which is before the current position of skb->data
65 * after that call and thus allow other skbs with the same data buffer
66 * to write freely in that area.
67 */
68 result = skb_cow_head(skb, len);
69 if (result < 0)
70 return result;
71
72 skb_push(skb, len);
73 return 0;
74 }
75
softif_neigh_free_ref(struct softif_neigh * softif_neigh)76 static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
77 {
78 if (atomic_dec_and_test(&softif_neigh->refcount))
79 kfree_rcu(softif_neigh, rcu);
80 }
81
softif_neigh_vid_free_rcu(struct rcu_head * rcu)82 static void softif_neigh_vid_free_rcu(struct rcu_head *rcu)
83 {
84 struct softif_neigh_vid *softif_neigh_vid;
85 struct softif_neigh *softif_neigh;
86 struct hlist_node *node, *node_tmp;
87 struct bat_priv *bat_priv;
88
89 softif_neigh_vid = container_of(rcu, struct softif_neigh_vid, rcu);
90 bat_priv = softif_neigh_vid->bat_priv;
91
92 spin_lock_bh(&bat_priv->softif_neigh_lock);
93 hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
94 &softif_neigh_vid->softif_neigh_list, list) {
95 hlist_del_rcu(&softif_neigh->list);
96 softif_neigh_free_ref(softif_neigh);
97 }
98 spin_unlock_bh(&bat_priv->softif_neigh_lock);
99
100 kfree(softif_neigh_vid);
101 }
102
softif_neigh_vid_free_ref(struct softif_neigh_vid * softif_neigh_vid)103 static void softif_neigh_vid_free_ref(struct softif_neigh_vid *softif_neigh_vid)
104 {
105 if (atomic_dec_and_test(&softif_neigh_vid->refcount))
106 call_rcu(&softif_neigh_vid->rcu, softif_neigh_vid_free_rcu);
107 }
108
softif_neigh_vid_get(struct bat_priv * bat_priv,short vid)109 static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
110 short vid)
111 {
112 struct softif_neigh_vid *softif_neigh_vid;
113 struct hlist_node *node;
114
115 rcu_read_lock();
116 hlist_for_each_entry_rcu(softif_neigh_vid, node,
117 &bat_priv->softif_neigh_vids, list) {
118 if (softif_neigh_vid->vid != vid)
119 continue;
120
121 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
122 continue;
123
124 goto out;
125 }
126
127 softif_neigh_vid = kzalloc(sizeof(*softif_neigh_vid), GFP_ATOMIC);
128 if (!softif_neigh_vid)
129 goto out;
130
131 softif_neigh_vid->vid = vid;
132 softif_neigh_vid->bat_priv = bat_priv;
133
134 /* initialize with 2 - caller decrements counter by one */
135 atomic_set(&softif_neigh_vid->refcount, 2);
136 INIT_HLIST_HEAD(&softif_neigh_vid->softif_neigh_list);
137 INIT_HLIST_NODE(&softif_neigh_vid->list);
138 spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
139 hlist_add_head_rcu(&softif_neigh_vid->list,
140 &bat_priv->softif_neigh_vids);
141 spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
142
143 out:
144 rcu_read_unlock();
145 return softif_neigh_vid;
146 }
147
softif_neigh_get(struct bat_priv * bat_priv,const uint8_t * addr,short vid)148 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
149 const uint8_t *addr, short vid)
150 {
151 struct softif_neigh_vid *softif_neigh_vid;
152 struct softif_neigh *softif_neigh = NULL;
153 struct hlist_node *node;
154
155 softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
156 if (!softif_neigh_vid)
157 goto out;
158
159 rcu_read_lock();
160 hlist_for_each_entry_rcu(softif_neigh, node,
161 &softif_neigh_vid->softif_neigh_list,
162 list) {
163 if (!compare_eth(softif_neigh->addr, addr))
164 continue;
165
166 if (!atomic_inc_not_zero(&softif_neigh->refcount))
167 continue;
168
169 softif_neigh->last_seen = jiffies;
170 goto unlock;
171 }
172
173 softif_neigh = kzalloc(sizeof(*softif_neigh), GFP_ATOMIC);
174 if (!softif_neigh)
175 goto unlock;
176
177 memcpy(softif_neigh->addr, addr, ETH_ALEN);
178 softif_neigh->last_seen = jiffies;
179 /* initialize with 2 - caller decrements counter by one */
180 atomic_set(&softif_neigh->refcount, 2);
181
182 INIT_HLIST_NODE(&softif_neigh->list);
183 spin_lock_bh(&bat_priv->softif_neigh_lock);
184 hlist_add_head_rcu(&softif_neigh->list,
185 &softif_neigh_vid->softif_neigh_list);
186 spin_unlock_bh(&bat_priv->softif_neigh_lock);
187
188 unlock:
189 rcu_read_unlock();
190 out:
191 if (softif_neigh_vid)
192 softif_neigh_vid_free_ref(softif_neigh_vid);
193 return softif_neigh;
194 }
195
softif_neigh_get_selected(struct softif_neigh_vid * softif_neigh_vid)196 static struct softif_neigh *softif_neigh_get_selected(
197 struct softif_neigh_vid *softif_neigh_vid)
198 {
199 struct softif_neigh *softif_neigh;
200
201 rcu_read_lock();
202 softif_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
203
204 if (softif_neigh && !atomic_inc_not_zero(&softif_neigh->refcount))
205 softif_neigh = NULL;
206
207 rcu_read_unlock();
208 return softif_neigh;
209 }
210
softif_neigh_vid_get_selected(struct bat_priv * bat_priv,short vid)211 static struct softif_neigh *softif_neigh_vid_get_selected(
212 struct bat_priv *bat_priv,
213 short vid)
214 {
215 struct softif_neigh_vid *softif_neigh_vid;
216 struct softif_neigh *softif_neigh = NULL;
217
218 softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
219 if (!softif_neigh_vid)
220 goto out;
221
222 softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
223 out:
224 if (softif_neigh_vid)
225 softif_neigh_vid_free_ref(softif_neigh_vid);
226 return softif_neigh;
227 }
228
softif_neigh_vid_select(struct bat_priv * bat_priv,struct softif_neigh * new_neigh,short vid)229 static void softif_neigh_vid_select(struct bat_priv *bat_priv,
230 struct softif_neigh *new_neigh,
231 short vid)
232 {
233 struct softif_neigh_vid *softif_neigh_vid;
234 struct softif_neigh *curr_neigh;
235
236 softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
237 if (!softif_neigh_vid)
238 goto out;
239
240 spin_lock_bh(&bat_priv->softif_neigh_lock);
241
242 if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
243 new_neigh = NULL;
244
245 curr_neigh = rcu_dereference_protected(softif_neigh_vid->softif_neigh,
246 1);
247 rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
248
249 if ((curr_neigh) && (!new_neigh))
250 bat_dbg(DBG_ROUTES, bat_priv,
251 "Removing mesh exit point on vid: %d (prev: %pM).\n",
252 vid, curr_neigh->addr);
253 else if ((curr_neigh) && (new_neigh))
254 bat_dbg(DBG_ROUTES, bat_priv,
255 "Changing mesh exit point on vid: %d from %pM to %pM.\n",
256 vid, curr_neigh->addr, new_neigh->addr);
257 else if ((!curr_neigh) && (new_neigh))
258 bat_dbg(DBG_ROUTES, bat_priv,
259 "Setting mesh exit point on vid: %d to %pM.\n",
260 vid, new_neigh->addr);
261
262 if (curr_neigh)
263 softif_neigh_free_ref(curr_neigh);
264
265 spin_unlock_bh(&bat_priv->softif_neigh_lock);
266
267 out:
268 if (softif_neigh_vid)
269 softif_neigh_vid_free_ref(softif_neigh_vid);
270 }
271
softif_neigh_vid_deselect(struct bat_priv * bat_priv,struct softif_neigh_vid * softif_neigh_vid)272 static void softif_neigh_vid_deselect(struct bat_priv *bat_priv,
273 struct softif_neigh_vid *softif_neigh_vid)
274 {
275 struct softif_neigh *curr_neigh;
276 struct softif_neigh *softif_neigh = NULL, *softif_neigh_tmp;
277 struct hard_iface *primary_if = NULL;
278 struct hlist_node *node;
279
280 primary_if = primary_if_get_selected(bat_priv);
281 if (!primary_if)
282 goto out;
283
284 /* find new softif_neigh immediately to avoid temporary loops */
285 rcu_read_lock();
286 curr_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
287
288 hlist_for_each_entry_rcu(softif_neigh_tmp, node,
289 &softif_neigh_vid->softif_neigh_list,
290 list) {
291 if (softif_neigh_tmp == curr_neigh)
292 continue;
293
294 /* we got a neighbor but its mac is 'bigger' than ours */
295 if (memcmp(primary_if->net_dev->dev_addr,
296 softif_neigh_tmp->addr, ETH_ALEN) < 0)
297 continue;
298
299 if (!atomic_inc_not_zero(&softif_neigh_tmp->refcount))
300 continue;
301
302 softif_neigh = softif_neigh_tmp;
303 goto unlock;
304 }
305
306 unlock:
307 rcu_read_unlock();
308 out:
309 softif_neigh_vid_select(bat_priv, softif_neigh, softif_neigh_vid->vid);
310
311 if (primary_if)
312 hardif_free_ref(primary_if);
313 if (softif_neigh)
314 softif_neigh_free_ref(softif_neigh);
315 }
316
softif_neigh_seq_print_text(struct seq_file * seq,void * offset)317 int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
318 {
319 struct net_device *net_dev = (struct net_device *)seq->private;
320 struct bat_priv *bat_priv = netdev_priv(net_dev);
321 struct softif_neigh_vid *softif_neigh_vid;
322 struct softif_neigh *softif_neigh;
323 struct hard_iface *primary_if;
324 struct hlist_node *node, *node_tmp;
325 struct softif_neigh *curr_softif_neigh;
326 int ret = 0, last_seen_secs, last_seen_msecs;
327
328 primary_if = primary_if_get_selected(bat_priv);
329 if (!primary_if) {
330 ret = seq_printf(seq,
331 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
332 net_dev->name);
333 goto out;
334 }
335
336 if (primary_if->if_status != IF_ACTIVE) {
337 ret = seq_printf(seq,
338 "BATMAN mesh %s disabled - primary interface not active\n",
339 net_dev->name);
340 goto out;
341 }
342
343 seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
344
345 rcu_read_lock();
346 hlist_for_each_entry_rcu(softif_neigh_vid, node,
347 &bat_priv->softif_neigh_vids, list) {
348 seq_printf(seq, " %-15s %s on vid: %d\n",
349 "Originator", "last-seen", softif_neigh_vid->vid);
350
351 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
352
353 hlist_for_each_entry_rcu(softif_neigh, node_tmp,
354 &softif_neigh_vid->softif_neigh_list,
355 list) {
356 last_seen_secs = jiffies_to_msecs(jiffies -
357 softif_neigh->last_seen) / 1000;
358 last_seen_msecs = jiffies_to_msecs(jiffies -
359 softif_neigh->last_seen) % 1000;
360 seq_printf(seq, "%s %pM %3i.%03is\n",
361 curr_softif_neigh == softif_neigh
362 ? "=>" : " ", softif_neigh->addr,
363 last_seen_secs, last_seen_msecs);
364 }
365
366 if (curr_softif_neigh)
367 softif_neigh_free_ref(curr_softif_neigh);
368
369 seq_printf(seq, "\n");
370 }
371 rcu_read_unlock();
372
373 out:
374 if (primary_if)
375 hardif_free_ref(primary_if);
376 return ret;
377 }
378
softif_neigh_purge(struct bat_priv * bat_priv)379 void softif_neigh_purge(struct bat_priv *bat_priv)
380 {
381 struct softif_neigh *softif_neigh, *curr_softif_neigh;
382 struct softif_neigh_vid *softif_neigh_vid;
383 struct hlist_node *node, *node_tmp, *node_tmp2;
384 int do_deselect;
385
386 rcu_read_lock();
387 hlist_for_each_entry_rcu(softif_neigh_vid, node,
388 &bat_priv->softif_neigh_vids, list) {
389 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
390 continue;
391
392 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
393 do_deselect = 0;
394
395 spin_lock_bh(&bat_priv->softif_neigh_lock);
396 hlist_for_each_entry_safe(softif_neigh, node_tmp, node_tmp2,
397 &softif_neigh_vid->softif_neigh_list,
398 list) {
399 if ((!has_timed_out(softif_neigh->last_seen,
400 SOFTIF_NEIGH_TIMEOUT)) &&
401 (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
402 continue;
403
404 if (curr_softif_neigh == softif_neigh) {
405 bat_dbg(DBG_ROUTES, bat_priv,
406 "Current mesh exit point on vid: %d '%pM' vanished.\n",
407 softif_neigh_vid->vid,
408 softif_neigh->addr);
409 do_deselect = 1;
410 }
411
412 hlist_del_rcu(&softif_neigh->list);
413 softif_neigh_free_ref(softif_neigh);
414 }
415 spin_unlock_bh(&bat_priv->softif_neigh_lock);
416
417 /* soft_neigh_vid_deselect() needs to acquire the
418 * softif_neigh_lock */
419 if (do_deselect)
420 softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
421
422 if (curr_softif_neigh)
423 softif_neigh_free_ref(curr_softif_neigh);
424
425 softif_neigh_vid_free_ref(softif_neigh_vid);
426 }
427 rcu_read_unlock();
428
429 spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
430 hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
431 &bat_priv->softif_neigh_vids, list) {
432 if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
433 continue;
434
435 hlist_del_rcu(&softif_neigh_vid->list);
436 softif_neigh_vid_free_ref(softif_neigh_vid);
437 }
438 spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
439
440 }
441
softif_batman_recv(struct sk_buff * skb,struct net_device * dev,short vid)442 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
443 short vid)
444 {
445 struct bat_priv *bat_priv = netdev_priv(dev);
446 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
447 struct batman_ogm_packet *batman_ogm_packet;
448 struct softif_neigh *softif_neigh = NULL;
449 struct hard_iface *primary_if = NULL;
450 struct softif_neigh *curr_softif_neigh = NULL;
451
452 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
453 batman_ogm_packet = (struct batman_ogm_packet *)
454 (skb->data + ETH_HLEN + VLAN_HLEN);
455 else
456 batman_ogm_packet = (struct batman_ogm_packet *)
457 (skb->data + ETH_HLEN);
458
459 if (batman_ogm_packet->header.version != COMPAT_VERSION)
460 goto out;
461
462 if (batman_ogm_packet->header.packet_type != BAT_OGM)
463 goto out;
464
465 if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
466 goto out;
467
468 if (is_my_mac(batman_ogm_packet->orig))
469 goto out;
470
471 softif_neigh = softif_neigh_get(bat_priv, batman_ogm_packet->orig, vid);
472 if (!softif_neigh)
473 goto out;
474
475 curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
476 if (curr_softif_neigh == softif_neigh)
477 goto out;
478
479 primary_if = primary_if_get_selected(bat_priv);
480 if (!primary_if)
481 goto out;
482
483 /* we got a neighbor but its mac is 'bigger' than ours */
484 if (memcmp(primary_if->net_dev->dev_addr,
485 softif_neigh->addr, ETH_ALEN) < 0)
486 goto out;
487
488 /* close own batX device and use softif_neigh as exit node */
489 if (!curr_softif_neigh) {
490 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
491 goto out;
492 }
493
494 /* switch to new 'smallest neighbor' */
495 if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
496 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
497
498 out:
499 kfree_skb(skb);
500 if (softif_neigh)
501 softif_neigh_free_ref(softif_neigh);
502 if (curr_softif_neigh)
503 softif_neigh_free_ref(curr_softif_neigh);
504 if (primary_if)
505 hardif_free_ref(primary_if);
506 return;
507 }
508
interface_open(struct net_device * dev)509 static int interface_open(struct net_device *dev)
510 {
511 netif_start_queue(dev);
512 return 0;
513 }
514
interface_release(struct net_device * dev)515 static int interface_release(struct net_device *dev)
516 {
517 netif_stop_queue(dev);
518 return 0;
519 }
520
interface_stats(struct net_device * dev)521 static struct net_device_stats *interface_stats(struct net_device *dev)
522 {
523 struct bat_priv *bat_priv = netdev_priv(dev);
524 return &bat_priv->stats;
525 }
526
interface_set_mac_addr(struct net_device * dev,void * p)527 static int interface_set_mac_addr(struct net_device *dev, void *p)
528 {
529 struct bat_priv *bat_priv = netdev_priv(dev);
530 struct sockaddr *addr = p;
531
532 if (!is_valid_ether_addr(addr->sa_data))
533 return -EADDRNOTAVAIL;
534
535 /* only modify transtable if it has been initialized before */
536 if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
537 tt_local_remove(bat_priv, dev->dev_addr,
538 "mac address changed", false);
539 tt_local_add(dev, addr->sa_data, NULL_IFINDEX);
540 }
541
542 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
543 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
544 return 0;
545 }
546
interface_change_mtu(struct net_device * dev,int new_mtu)547 static int interface_change_mtu(struct net_device *dev, int new_mtu)
548 {
549 /* check ranges */
550 if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
551 return -EINVAL;
552
553 dev->mtu = new_mtu;
554
555 return 0;
556 }
557
interface_tx(struct sk_buff * skb,struct net_device * soft_iface)558 static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
559 {
560 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
561 struct bat_priv *bat_priv = netdev_priv(soft_iface);
562 struct hard_iface *primary_if = NULL;
563 struct bcast_packet *bcast_packet;
564 struct vlan_ethhdr *vhdr;
565 struct softif_neigh *curr_softif_neigh = NULL;
566 unsigned int header_len = 0;
567 int data_len = skb->len, ret;
568 short vid = -1;
569 bool do_bcast = false;
570
571 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
572 goto dropped;
573
574 soft_iface->trans_start = jiffies;
575
576 switch (ntohs(ethhdr->h_proto)) {
577 case ETH_P_8021Q:
578 vhdr = (struct vlan_ethhdr *)skb->data;
579 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
580
581 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
582 break;
583
584 /* fall through */
585 case ETH_P_BATMAN:
586 softif_batman_recv(skb, soft_iface, vid);
587 goto end;
588 }
589
590 /**
591 * if we have a another chosen mesh exit node in range
592 * it will transport the packets to the mesh
593 */
594 curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
595 if (curr_softif_neigh)
596 goto dropped;
597
598 /* Register the client MAC in the transtable */
599 tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
600
601 if (is_multicast_ether_addr(ethhdr->h_dest)) {
602 do_bcast = true;
603
604 switch (atomic_read(&bat_priv->gw_mode)) {
605 case GW_MODE_SERVER:
606 /* gateway servers should not send dhcp
607 * requests into the mesh */
608 ret = gw_is_dhcp_target(skb, &header_len);
609 if (ret)
610 goto dropped;
611 break;
612 case GW_MODE_CLIENT:
613 /* gateway clients should send dhcp requests
614 * via unicast to their gateway */
615 ret = gw_is_dhcp_target(skb, &header_len);
616 if (ret)
617 do_bcast = false;
618 break;
619 case GW_MODE_OFF:
620 default:
621 break;
622 }
623 }
624
625 /* ethernet packet should be broadcasted */
626 if (do_bcast) {
627 primary_if = primary_if_get_selected(bat_priv);
628 if (!primary_if)
629 goto dropped;
630
631 if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
632 goto dropped;
633
634 bcast_packet = (struct bcast_packet *)skb->data;
635 bcast_packet->header.version = COMPAT_VERSION;
636 bcast_packet->header.ttl = TTL;
637
638 /* batman packet type: broadcast */
639 bcast_packet->header.packet_type = BAT_BCAST;
640
641 /* hw address of first interface is the orig mac because only
642 * this mac is known throughout the mesh */
643 memcpy(bcast_packet->orig,
644 primary_if->net_dev->dev_addr, ETH_ALEN);
645
646 /* set broadcast sequence number */
647 bcast_packet->seqno =
648 htonl(atomic_inc_return(&bat_priv->bcast_seqno));
649
650 add_bcast_packet_to_list(bat_priv, skb, 1);
651
652 /* a copy is stored in the bcast list, therefore removing
653 * the original skb. */
654 kfree_skb(skb);
655
656 /* unicast packet */
657 } else {
658 if (atomic_read(&bat_priv->gw_mode) != GW_MODE_OFF) {
659 ret = gw_out_of_range(bat_priv, skb, ethhdr);
660 if (ret)
661 goto dropped;
662 }
663
664 ret = unicast_send_skb(skb, bat_priv);
665 if (ret != 0)
666 goto dropped_freed;
667 }
668
669 bat_priv->stats.tx_packets++;
670 bat_priv->stats.tx_bytes += data_len;
671 goto end;
672
673 dropped:
674 kfree_skb(skb);
675 dropped_freed:
676 bat_priv->stats.tx_dropped++;
677 end:
678 if (curr_softif_neigh)
679 softif_neigh_free_ref(curr_softif_neigh);
680 if (primary_if)
681 hardif_free_ref(primary_if);
682 return NETDEV_TX_OK;
683 }
684
interface_rx(struct net_device * soft_iface,struct sk_buff * skb,struct hard_iface * recv_if,int hdr_size)685 void interface_rx(struct net_device *soft_iface,
686 struct sk_buff *skb, struct hard_iface *recv_if,
687 int hdr_size)
688 {
689 struct bat_priv *bat_priv = netdev_priv(soft_iface);
690 struct unicast_packet *unicast_packet;
691 struct ethhdr *ethhdr;
692 struct vlan_ethhdr *vhdr;
693 struct softif_neigh *curr_softif_neigh = NULL;
694 short vid = -1;
695 int ret;
696
697 /* check if enough space is available for pulling, and pull */
698 if (!pskb_may_pull(skb, hdr_size))
699 goto dropped;
700
701 skb_pull_rcsum(skb, hdr_size);
702 skb_reset_mac_header(skb);
703
704 ethhdr = (struct ethhdr *)skb_mac_header(skb);
705
706 switch (ntohs(ethhdr->h_proto)) {
707 case ETH_P_8021Q:
708 vhdr = (struct vlan_ethhdr *)skb->data;
709 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
710
711 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
712 break;
713
714 /* fall through */
715 case ETH_P_BATMAN:
716 goto dropped;
717 }
718
719 /**
720 * if we have a another chosen mesh exit node in range
721 * it will transport the packets to the non-mesh network
722 */
723 curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
724 if (curr_softif_neigh) {
725 skb_push(skb, hdr_size);
726 unicast_packet = (struct unicast_packet *)skb->data;
727
728 if ((unicast_packet->header.packet_type != BAT_UNICAST) &&
729 (unicast_packet->header.packet_type != BAT_UNICAST_FRAG))
730 goto dropped;
731
732 skb_reset_mac_header(skb);
733
734 memcpy(unicast_packet->dest,
735 curr_softif_neigh->addr, ETH_ALEN);
736 ret = route_unicast_packet(skb, recv_if);
737 if (ret == NET_RX_DROP)
738 goto dropped;
739
740 goto out;
741 }
742
743 /* skb->dev & skb->pkt_type are set here */
744 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
745 goto dropped;
746 skb->protocol = eth_type_trans(skb, soft_iface);
747
748 /* should not be necessary anymore as we use skb_pull_rcsum()
749 * TODO: please verify this and remove this TODO
750 * -- Dec 21st 2009, Simon Wunderlich */
751
752 /* skb->ip_summed = CHECKSUM_UNNECESSARY;*/
753
754 bat_priv->stats.rx_packets++;
755 bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
756
757 soft_iface->last_rx = jiffies;
758
759 if (is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
760 goto dropped;
761
762 netif_rx(skb);
763 goto out;
764
765 dropped:
766 kfree_skb(skb);
767 out:
768 if (curr_softif_neigh)
769 softif_neigh_free_ref(curr_softif_neigh);
770 return;
771 }
772
773 static const struct net_device_ops bat_netdev_ops = {
774 .ndo_open = interface_open,
775 .ndo_stop = interface_release,
776 .ndo_get_stats = interface_stats,
777 .ndo_set_mac_address = interface_set_mac_addr,
778 .ndo_change_mtu = interface_change_mtu,
779 .ndo_start_xmit = interface_tx,
780 .ndo_validate_addr = eth_validate_addr
781 };
782
interface_setup(struct net_device * dev)783 static void interface_setup(struct net_device *dev)
784 {
785 struct bat_priv *priv = netdev_priv(dev);
786
787 ether_setup(dev);
788
789 dev->netdev_ops = &bat_netdev_ops;
790 dev->destructor = free_netdev;
791 dev->tx_queue_len = 0;
792
793 /**
794 * can't call min_mtu, because the needed variables
795 * have not been initialized yet
796 */
797 dev->mtu = ETH_DATA_LEN;
798 /* reserve more space in the skbuff for our header */
799 dev->hard_header_len = BAT_HEADER_LEN;
800
801 /* generate random address */
802 eth_hw_addr_random(dev);
803
804 SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
805
806 memset(priv, 0, sizeof(*priv));
807 }
808
softif_create(const char * name)809 struct net_device *softif_create(const char *name)
810 {
811 struct net_device *soft_iface;
812 struct bat_priv *bat_priv;
813 int ret;
814
815 soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
816
817 if (!soft_iface)
818 goto out;
819
820 ret = register_netdevice(soft_iface);
821 if (ret < 0) {
822 pr_err("Unable to register the batman interface '%s': %i\n",
823 name, ret);
824 goto free_soft_iface;
825 }
826
827 bat_priv = netdev_priv(soft_iface);
828
829 atomic_set(&bat_priv->aggregated_ogms, 1);
830 atomic_set(&bat_priv->bonding, 0);
831 atomic_set(&bat_priv->ap_isolation, 0);
832 atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
833 atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
834 atomic_set(&bat_priv->gw_sel_class, 20);
835 atomic_set(&bat_priv->gw_bandwidth, 41);
836 atomic_set(&bat_priv->orig_interval, 1000);
837 atomic_set(&bat_priv->hop_penalty, 10);
838 atomic_set(&bat_priv->log_level, 0);
839 atomic_set(&bat_priv->fragmentation, 1);
840 atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
841 atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
842
843 atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
844 atomic_set(&bat_priv->bcast_seqno, 1);
845 atomic_set(&bat_priv->ttvn, 0);
846 atomic_set(&bat_priv->tt_local_changes, 0);
847 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
848
849 bat_priv->tt_buff = NULL;
850 bat_priv->tt_buff_len = 0;
851 bat_priv->tt_poss_change = false;
852
853 bat_priv->primary_if = NULL;
854 bat_priv->num_ifaces = 0;
855
856 ret = bat_algo_select(bat_priv, bat_routing_algo);
857 if (ret < 0)
858 goto unreg_soft_iface;
859
860 ret = sysfs_add_meshif(soft_iface);
861 if (ret < 0)
862 goto unreg_soft_iface;
863
864 ret = debugfs_add_meshif(soft_iface);
865 if (ret < 0)
866 goto unreg_sysfs;
867
868 ret = mesh_init(soft_iface);
869 if (ret < 0)
870 goto unreg_debugfs;
871
872 return soft_iface;
873
874 unreg_debugfs:
875 debugfs_del_meshif(soft_iface);
876 unreg_sysfs:
877 sysfs_del_meshif(soft_iface);
878 unreg_soft_iface:
879 unregister_netdevice(soft_iface);
880 return NULL;
881
882 free_soft_iface:
883 free_netdev(soft_iface);
884 out:
885 return NULL;
886 }
887
softif_destroy(struct net_device * soft_iface)888 void softif_destroy(struct net_device *soft_iface)
889 {
890 debugfs_del_meshif(soft_iface);
891 sysfs_del_meshif(soft_iface);
892 mesh_free(soft_iface);
893 unregister_netdevice(soft_iface);
894 }
895
softif_is_valid(const struct net_device * net_dev)896 int softif_is_valid(const struct net_device *net_dev)
897 {
898 if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
899 return 1;
900
901 return 0;
902 }
903
904 /* ethtool */
bat_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)905 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
906 {
907 cmd->supported = 0;
908 cmd->advertising = 0;
909 ethtool_cmd_speed_set(cmd, SPEED_10);
910 cmd->duplex = DUPLEX_FULL;
911 cmd->port = PORT_TP;
912 cmd->phy_address = 0;
913 cmd->transceiver = XCVR_INTERNAL;
914 cmd->autoneg = AUTONEG_DISABLE;
915 cmd->maxtxpkt = 0;
916 cmd->maxrxpkt = 0;
917
918 return 0;
919 }
920
bat_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)921 static void bat_get_drvinfo(struct net_device *dev,
922 struct ethtool_drvinfo *info)
923 {
924 strcpy(info->driver, "B.A.T.M.A.N. advanced");
925 strcpy(info->version, SOURCE_VERSION);
926 strcpy(info->fw_version, "N/A");
927 strcpy(info->bus_info, "batman");
928 }
929
bat_get_msglevel(struct net_device * dev)930 static u32 bat_get_msglevel(struct net_device *dev)
931 {
932 return -EOPNOTSUPP;
933 }
934
bat_set_msglevel(struct net_device * dev,u32 value)935 static void bat_set_msglevel(struct net_device *dev, u32 value)
936 {
937 }
938
bat_get_link(struct net_device * dev)939 static u32 bat_get_link(struct net_device *dev)
940 {
941 return 1;
942 }
943