1 /*
2  * Copyright (C) 2007-2011 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 "
256 			"to %pM.\n", 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, "BATMAN mesh %s disabled - "
331 				 "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, "BATMAN mesh %s "
338 				 "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 ((!time_after(jiffies, softif_neigh->last_seen +
400 				msecs_to_jiffies(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 "
407 					"'%pM' vanished.\n",
408 					softif_neigh_vid->vid,
409 					softif_neigh->addr);
410 				do_deselect = 1;
411 			}
412 
413 			hlist_del_rcu(&softif_neigh->list);
414 			softif_neigh_free_ref(softif_neigh);
415 		}
416 		spin_unlock_bh(&bat_priv->softif_neigh_lock);
417 
418 		/* soft_neigh_vid_deselect() needs to acquire the
419 		 * softif_neigh_lock */
420 		if (do_deselect)
421 			softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
422 
423 		if (curr_softif_neigh)
424 			softif_neigh_free_ref(curr_softif_neigh);
425 
426 		softif_neigh_vid_free_ref(softif_neigh_vid);
427 	}
428 	rcu_read_unlock();
429 
430 	spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
431 	hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
432 				  &bat_priv->softif_neigh_vids, list) {
433 		if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
434 			continue;
435 
436 		hlist_del_rcu(&softif_neigh_vid->list);
437 		softif_neigh_vid_free_ref(softif_neigh_vid);
438 	}
439 	spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
440 
441 }
442 
softif_batman_recv(struct sk_buff * skb,struct net_device * dev,short vid)443 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
444 			       short vid)
445 {
446 	struct bat_priv *bat_priv = netdev_priv(dev);
447 	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
448 	struct batman_ogm_packet *batman_ogm_packet;
449 	struct softif_neigh *softif_neigh = NULL;
450 	struct hard_iface *primary_if = NULL;
451 	struct softif_neigh *curr_softif_neigh = NULL;
452 
453 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
454 		batman_ogm_packet = (struct batman_ogm_packet *)
455 					(skb->data + ETH_HLEN + VLAN_HLEN);
456 	else
457 		batman_ogm_packet = (struct batman_ogm_packet *)
458 							(skb->data + ETH_HLEN);
459 
460 	if (batman_ogm_packet->version != COMPAT_VERSION)
461 		goto out;
462 
463 	if (batman_ogm_packet->packet_type != BAT_OGM)
464 		goto out;
465 
466 	if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
467 		goto out;
468 
469 	if (is_my_mac(batman_ogm_packet->orig))
470 		goto out;
471 
472 	softif_neigh = softif_neigh_get(bat_priv, batman_ogm_packet->orig, vid);
473 	if (!softif_neigh)
474 		goto out;
475 
476 	curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
477 	if (curr_softif_neigh == softif_neigh)
478 		goto out;
479 
480 	primary_if = primary_if_get_selected(bat_priv);
481 	if (!primary_if)
482 		goto out;
483 
484 	/* we got a neighbor but its mac is 'bigger' than ours  */
485 	if (memcmp(primary_if->net_dev->dev_addr,
486 		   softif_neigh->addr, ETH_ALEN) < 0)
487 		goto out;
488 
489 	/* close own batX device and use softif_neigh as exit node */
490 	if (!curr_softif_neigh) {
491 		softif_neigh_vid_select(bat_priv, softif_neigh, vid);
492 		goto out;
493 	}
494 
495 	/* switch to new 'smallest neighbor' */
496 	if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
497 		softif_neigh_vid_select(bat_priv, softif_neigh, vid);
498 
499 out:
500 	kfree_skb(skb);
501 	if (softif_neigh)
502 		softif_neigh_free_ref(softif_neigh);
503 	if (curr_softif_neigh)
504 		softif_neigh_free_ref(curr_softif_neigh);
505 	if (primary_if)
506 		hardif_free_ref(primary_if);
507 	return;
508 }
509 
interface_open(struct net_device * dev)510 static int interface_open(struct net_device *dev)
511 {
512 	netif_start_queue(dev);
513 	return 0;
514 }
515 
interface_release(struct net_device * dev)516 static int interface_release(struct net_device *dev)
517 {
518 	netif_stop_queue(dev);
519 	return 0;
520 }
521 
interface_stats(struct net_device * dev)522 static struct net_device_stats *interface_stats(struct net_device *dev)
523 {
524 	struct bat_priv *bat_priv = netdev_priv(dev);
525 	return &bat_priv->stats;
526 }
527 
interface_set_mac_addr(struct net_device * dev,void * p)528 static int interface_set_mac_addr(struct net_device *dev, void *p)
529 {
530 	struct bat_priv *bat_priv = netdev_priv(dev);
531 	struct sockaddr *addr = p;
532 
533 	if (!is_valid_ether_addr(addr->sa_data))
534 		return -EADDRNOTAVAIL;
535 
536 	/* only modify transtable if it has been initialized before */
537 	if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
538 		tt_local_remove(bat_priv, dev->dev_addr,
539 				"mac address changed", false);
540 		tt_local_add(dev, addr->sa_data, NULL_IFINDEX);
541 	}
542 
543 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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->version = COMPAT_VERSION;
636 		bcast_packet->ttl = TTL;
637 
638 		/* batman packet type: broadcast */
639 		bcast_packet->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->packet_type != BAT_UNICAST) &&
729 		    (unicast_packet->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 	char dev_addr[ETH_ALEN];
787 
788 	ether_setup(dev);
789 
790 	dev->netdev_ops = &bat_netdev_ops;
791 	dev->destructor = free_netdev;
792 	dev->tx_queue_len = 0;
793 
794 	/**
795 	 * can't call min_mtu, because the needed variables
796 	 * have not been initialized yet
797 	 */
798 	dev->mtu = ETH_DATA_LEN;
799 	/* reserve more space in the skbuff for our header */
800 	dev->hard_header_len = BAT_HEADER_LEN;
801 
802 	/* generate random address */
803 	random_ether_addr(dev_addr);
804 	memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
805 
806 	SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
807 
808 	memset(priv, 0, sizeof(*priv));
809 }
810 
softif_create(const char * name)811 struct net_device *softif_create(const char *name)
812 {
813 	struct net_device *soft_iface;
814 	struct bat_priv *bat_priv;
815 	int ret;
816 
817 	soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
818 
819 	if (!soft_iface)
820 		goto out;
821 
822 	ret = register_netdevice(soft_iface);
823 	if (ret < 0) {
824 		pr_err("Unable to register the batman interface '%s': %i\n",
825 		       name, ret);
826 		goto free_soft_iface;
827 	}
828 
829 	bat_priv = netdev_priv(soft_iface);
830 
831 	atomic_set(&bat_priv->aggregated_ogms, 1);
832 	atomic_set(&bat_priv->bonding, 0);
833 	atomic_set(&bat_priv->ap_isolation, 0);
834 	atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
835 	atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
836 	atomic_set(&bat_priv->gw_sel_class, 20);
837 	atomic_set(&bat_priv->gw_bandwidth, 41);
838 	atomic_set(&bat_priv->orig_interval, 1000);
839 	atomic_set(&bat_priv->hop_penalty, 10);
840 	atomic_set(&bat_priv->log_level, 0);
841 	atomic_set(&bat_priv->fragmentation, 1);
842 	atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
843 	atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
844 
845 	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
846 	atomic_set(&bat_priv->bcast_seqno, 1);
847 	atomic_set(&bat_priv->ttvn, 0);
848 	atomic_set(&bat_priv->tt_local_changes, 0);
849 	atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
850 
851 	bat_priv->tt_buff = NULL;
852 	bat_priv->tt_buff_len = 0;
853 	bat_priv->tt_poss_change = false;
854 
855 	bat_priv->primary_if = NULL;
856 	bat_priv->num_ifaces = 0;
857 
858 	ret = sysfs_add_meshif(soft_iface);
859 	if (ret < 0)
860 		goto unreg_soft_iface;
861 
862 	ret = debugfs_add_meshif(soft_iface);
863 	if (ret < 0)
864 		goto unreg_sysfs;
865 
866 	ret = mesh_init(soft_iface);
867 	if (ret < 0)
868 		goto unreg_debugfs;
869 
870 	return soft_iface;
871 
872 unreg_debugfs:
873 	debugfs_del_meshif(soft_iface);
874 unreg_sysfs:
875 	sysfs_del_meshif(soft_iface);
876 unreg_soft_iface:
877 	unregister_netdevice(soft_iface);
878 	return NULL;
879 
880 free_soft_iface:
881 	free_netdev(soft_iface);
882 out:
883 	return NULL;
884 }
885 
softif_destroy(struct net_device * soft_iface)886 void softif_destroy(struct net_device *soft_iface)
887 {
888 	debugfs_del_meshif(soft_iface);
889 	sysfs_del_meshif(soft_iface);
890 	mesh_free(soft_iface);
891 	unregister_netdevice(soft_iface);
892 }
893 
softif_is_valid(const struct net_device * net_dev)894 int softif_is_valid(const struct net_device *net_dev)
895 {
896 	if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
897 		return 1;
898 
899 	return 0;
900 }
901 
902 /* ethtool */
bat_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)903 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
904 {
905 	cmd->supported = 0;
906 	cmd->advertising = 0;
907 	ethtool_cmd_speed_set(cmd, SPEED_10);
908 	cmd->duplex = DUPLEX_FULL;
909 	cmd->port = PORT_TP;
910 	cmd->phy_address = 0;
911 	cmd->transceiver = XCVR_INTERNAL;
912 	cmd->autoneg = AUTONEG_DISABLE;
913 	cmd->maxtxpkt = 0;
914 	cmd->maxrxpkt = 0;
915 
916 	return 0;
917 }
918 
bat_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)919 static void bat_get_drvinfo(struct net_device *dev,
920 			    struct ethtool_drvinfo *info)
921 {
922 	strcpy(info->driver, "B.A.T.M.A.N. advanced");
923 	strcpy(info->version, SOURCE_VERSION);
924 	strcpy(info->fw_version, "N/A");
925 	strcpy(info->bus_info, "batman");
926 }
927 
bat_get_msglevel(struct net_device * dev)928 static u32 bat_get_msglevel(struct net_device *dev)
929 {
930 	return -EOPNOTSUPP;
931 }
932 
bat_set_msglevel(struct net_device * dev,u32 value)933 static void bat_set_msglevel(struct net_device *dev, u32 value)
934 {
935 }
936 
bat_get_link(struct net_device * dev)937 static u32 bat_get_link(struct net_device *dev)
938 {
939 	return 1;
940 }
941