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TOMOYO Linux Cross Reference
Linux/net/batman-adv/bat_iv_ogm.c

Version: ~ [ linux-5.13-rc7 ] ~ [ linux-5.12.12 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.45 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.127 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.195 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.237 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.273 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.273 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 "bat_algo.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/bitmap.h>
 23 #include <linux/bitops.h>
 24 #include <linux/bug.h>
 25 #include <linux/byteorder/generic.h>
 26 #include <linux/cache.h>
 27 #include <linux/errno.h>
 28 #include <linux/etherdevice.h>
 29 #include <linux/fs.h>
 30 #include <linux/if_ether.h>
 31 #include <linux/init.h>
 32 #include <linux/jiffies.h>
 33 #include <linux/list.h>
 34 #include <linux/kref.h>
 35 #include <linux/lockdep.h>
 36 #include <linux/netdevice.h>
 37 #include <linux/pkt_sched.h>
 38 #include <linux/printk.h>
 39 #include <linux/random.h>
 40 #include <linux/rculist.h>
 41 #include <linux/rcupdate.h>
 42 #include <linux/seq_file.h>
 43 #include <linux/skbuff.h>
 44 #include <linux/slab.h>
 45 #include <linux/spinlock.h>
 46 #include <linux/stddef.h>
 47 #include <linux/string.h>
 48 #include <linux/types.h>
 49 #include <linux/workqueue.h>
 50 
 51 #include "bitarray.h"
 52 #include "hard-interface.h"
 53 #include "hash.h"
 54 #include "network-coding.h"
 55 #include "originator.h"
 56 #include "packet.h"
 57 #include "routing.h"
 58 #include "send.h"
 59 #include "translation-table.h"
 60 
 61 /**
 62  * enum batadv_dup_status - duplicate status
 63  * @BATADV_NO_DUP: the packet is no duplicate
 64  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
 65  *  neighbor)
 66  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
 67  * @BATADV_PROTECTED: originator is currently protected (after reboot)
 68  */
 69 enum batadv_dup_status {
 70         BATADV_NO_DUP = 0,
 71         BATADV_ORIG_DUP,
 72         BATADV_NEIGH_DUP,
 73         BATADV_PROTECTED,
 74 };
 75 
 76 /**
 77  * batadv_ring_buffer_set - update the ring buffer with the given value
 78  * @lq_recv: pointer to the ring buffer
 79  * @lq_index: index to store the value at
 80  * @value: value to store in the ring buffer
 81  */
 82 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
 83 {
 84         lq_recv[*lq_index] = value;
 85         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
 86 }
 87 
 88 /**
 89  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
 90  * in the given ring buffer
 91  * @lq_recv: pointer to the ring buffer
 92  *
 93  * Return: computed average value.
 94  */
 95 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
 96 {
 97         const u8 *ptr;
 98         u16 count = 0;
 99         u16 i = 0;
100         u16 sum = 0;
101 
102         ptr = lq_recv;
103 
104         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
105                 if (*ptr != 0) {
106                         count++;
107                         sum += *ptr;
108                 }
109 
110                 i++;
111                 ptr++;
112         }
113 
114         if (count == 0)
115                 return 0;
116 
117         return (u8)(sum / count);
118 }
119 
120 /**
121  * batadv_iv_ogm_orig_free - free the private resources allocated for this
122  *  orig_node
123  * @orig_node: the orig_node for which the resources have to be free'd
124  */
125 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
126 {
127         kfree(orig_node->bat_iv.bcast_own);
128         kfree(orig_node->bat_iv.bcast_own_sum);
129 }
130 
131 /**
132  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
133  *  include the new hard-interface
134  * @orig_node: the orig_node that has to be changed
135  * @max_if_num: the current amount of interfaces
136  *
137  * Return: 0 on success, a negative error code otherwise.
138  */
139 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
140                                      int max_if_num)
141 {
142         void *data_ptr;
143         size_t old_size;
144         int ret = -ENOMEM;
145 
146         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
147 
148         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
149         data_ptr = kmalloc_array(max_if_num,
150                                  BATADV_NUM_WORDS * sizeof(unsigned long),
151                                  GFP_ATOMIC);
152         if (!data_ptr)
153                 goto unlock;
154 
155         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
156         kfree(orig_node->bat_iv.bcast_own);
157         orig_node->bat_iv.bcast_own = data_ptr;
158 
159         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
160         if (!data_ptr)
161                 goto unlock;
162 
163         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
164                (max_if_num - 1) * sizeof(u8));
165         kfree(orig_node->bat_iv.bcast_own_sum);
166         orig_node->bat_iv.bcast_own_sum = data_ptr;
167 
168         ret = 0;
169 
170 unlock:
171         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
172 
173         return ret;
174 }
175 
176 /**
177  * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own
178  * @orig_node: the orig_node that has to be changed
179  * @max_if_num: the current amount of interfaces
180  * @del_if_num: the index of the interface being removed
181  */
182 static void
183 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
184                                    int max_if_num, int del_if_num)
185 {
186         size_t chunk_size;
187         size_t if_offset;
188         void *data_ptr;
189 
190         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
191 
192         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
193         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
194         if (!data_ptr)
195                 /* use old buffer when new one could not be allocated */
196                 data_ptr = orig_node->bat_iv.bcast_own;
197 
198         /* copy first part */
199         memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
200 
201         /* copy second part */
202         if_offset = (del_if_num + 1) * chunk_size;
203         memmove((char *)data_ptr + del_if_num * chunk_size,
204                 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
205                 (max_if_num - del_if_num) * chunk_size);
206 
207         /* bcast_own was shrunk down in new buffer; free old one */
208         if (orig_node->bat_iv.bcast_own != data_ptr) {
209                 kfree(orig_node->bat_iv.bcast_own);
210                 orig_node->bat_iv.bcast_own = data_ptr;
211         }
212 }
213 
214 /**
215  * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
216  * @orig_node: the orig_node that has to be changed
217  * @max_if_num: the current amount of interfaces
218  * @del_if_num: the index of the interface being removed
219  */
220 static void
221 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
222                                        int max_if_num, int del_if_num)
223 {
224         size_t if_offset;
225         void *data_ptr;
226 
227         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
228 
229         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
230         if (!data_ptr)
231                 /* use old buffer when new one could not be allocated */
232                 data_ptr = orig_node->bat_iv.bcast_own_sum;
233 
234         memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
235                 del_if_num * sizeof(u8));
236 
237         if_offset = (del_if_num + 1) * sizeof(u8);
238         memmove((char *)data_ptr + del_if_num * sizeof(u8),
239                 orig_node->bat_iv.bcast_own_sum + if_offset,
240                 (max_if_num - del_if_num) * sizeof(u8));
241 
242         /* bcast_own_sum was shrunk down in new buffer; free old one */
243         if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
244                 kfree(orig_node->bat_iv.bcast_own_sum);
245                 orig_node->bat_iv.bcast_own_sum = data_ptr;
246         }
247 }
248 
249 /**
250  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
251  *  exclude the removed interface
252  * @orig_node: the orig_node that has to be changed
253  * @max_if_num: the current amount of interfaces
254  * @del_if_num: the index of the interface being removed
255  *
256  * Return: 0 on success, a negative error code otherwise.
257  */
258 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
259                                      int max_if_num, int del_if_num)
260 {
261         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
262 
263         if (max_if_num == 0) {
264                 kfree(orig_node->bat_iv.bcast_own);
265                 kfree(orig_node->bat_iv.bcast_own_sum);
266                 orig_node->bat_iv.bcast_own = NULL;
267                 orig_node->bat_iv.bcast_own_sum = NULL;
268         } else {
269                 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
270                                                    del_if_num);
271                 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
272                                                        del_if_num);
273         }
274 
275         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
276 
277         return 0;
278 }
279 
280 /**
281  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
282  * @bat_priv: the bat priv with all the soft interface information
283  * @addr: mac address of the originator
284  *
285  * Return: the originator object corresponding to the passed mac address or NULL
286  * on failure.
287  * If the object does not exists it is created an initialised.
288  */
289 static struct batadv_orig_node *
290 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
291 {
292         struct batadv_orig_node *orig_node;
293         int size, hash_added;
294 
295         orig_node = batadv_orig_hash_find(bat_priv, addr);
296         if (orig_node)
297                 return orig_node;
298 
299         orig_node = batadv_orig_node_new(bat_priv, addr);
300         if (!orig_node)
301                 return NULL;
302 
303         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
304 
305         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
306         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
307         if (!orig_node->bat_iv.bcast_own)
308                 goto free_orig_node;
309 
310         size = bat_priv->num_ifaces * sizeof(u8);
311         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
312         if (!orig_node->bat_iv.bcast_own_sum)
313                 goto free_orig_node;
314 
315         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
316                                      batadv_choose_orig, orig_node,
317                                      &orig_node->hash_entry);
318         if (hash_added != 0)
319                 goto free_orig_node;
320 
321         return orig_node;
322 
323 free_orig_node:
324         /* free twice, as batadv_orig_node_new sets refcount to 2 */
325         batadv_orig_node_put(orig_node);
326         batadv_orig_node_put(orig_node);
327 
328         return NULL;
329 }
330 
331 static struct batadv_neigh_node *
332 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
333                         const u8 *neigh_addr,
334                         struct batadv_orig_node *orig_node,
335                         struct batadv_orig_node *orig_neigh)
336 {
337         struct batadv_neigh_node *neigh_node;
338 
339         neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
340         if (!neigh_node)
341                 goto out;
342 
343         neigh_node->orig_node = orig_neigh;
344 
345 out:
346         return neigh_node;
347 }
348 
349 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
350 {
351         struct batadv_ogm_packet *batadv_ogm_packet;
352         unsigned char *ogm_buff;
353         u32 random_seqno;
354 
355         /* randomize initial seqno to avoid collision */
356         get_random_bytes(&random_seqno, sizeof(random_seqno));
357         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
358 
359         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
360         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
361         if (!ogm_buff)
362                 return -ENOMEM;
363 
364         hard_iface->bat_iv.ogm_buff = ogm_buff;
365 
366         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
367         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
368         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
369         batadv_ogm_packet->ttl = 2;
370         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
371         batadv_ogm_packet->reserved = 0;
372         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
373 
374         return 0;
375 }
376 
377 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
378 {
379         kfree(hard_iface->bat_iv.ogm_buff);
380         hard_iface->bat_iv.ogm_buff = NULL;
381 }
382 
383 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
384 {
385         struct batadv_ogm_packet *batadv_ogm_packet;
386         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
387 
388         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
389         ether_addr_copy(batadv_ogm_packet->orig,
390                         hard_iface->net_dev->dev_addr);
391         ether_addr_copy(batadv_ogm_packet->prev_sender,
392                         hard_iface->net_dev->dev_addr);
393 }
394 
395 static void
396 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
397 {
398         struct batadv_ogm_packet *batadv_ogm_packet;
399         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
400 
401         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
402         batadv_ogm_packet->ttl = BATADV_TTL;
403 }
404 
405 /* when do we schedule our own ogm to be sent */
406 static unsigned long
407 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
408 {
409         unsigned int msecs;
410 
411         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
412         msecs += prandom_u32() % (2 * BATADV_JITTER);
413 
414         return jiffies + msecs_to_jiffies(msecs);
415 }
416 
417 /* when do we schedule a ogm packet to be sent */
418 static unsigned long batadv_iv_ogm_fwd_send_time(void)
419 {
420         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
421 }
422 
423 /* apply hop penalty for a normal link */
424 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
425 {
426         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
427         int new_tq;
428 
429         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
430         new_tq /= BATADV_TQ_MAX_VALUE;
431 
432         return new_tq;
433 }
434 
435 /**
436  * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
437  * @buff_pos: current position in the skb
438  * @packet_len: total length of the skb
439  * @tvlv_len: tvlv length of the previously considered OGM
440  *
441  * Return: true if there is enough space for another OGM, false otherwise.
442  */
443 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
444                                       __be16 tvlv_len)
445 {
446         int next_buff_pos = 0;
447 
448         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
449         next_buff_pos += ntohs(tvlv_len);
450 
451         return (next_buff_pos <= packet_len) &&
452                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
453 }
454 
455 /* send a batman ogm to a given interface */
456 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
457                                      struct batadv_hard_iface *hard_iface)
458 {
459         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
460         const char *fwd_str;
461         u8 packet_num;
462         s16 buff_pos;
463         struct batadv_ogm_packet *batadv_ogm_packet;
464         struct sk_buff *skb;
465         u8 *packet_pos;
466 
467         if (hard_iface->if_status != BATADV_IF_ACTIVE)
468                 return;
469 
470         packet_num = 0;
471         buff_pos = 0;
472         packet_pos = forw_packet->skb->data;
473         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
474 
475         /* adjust all flags and log packets */
476         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
477                                          batadv_ogm_packet->tvlv_len)) {
478                 /* we might have aggregated direct link packets with an
479                  * ordinary base packet
480                  */
481                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
482                     forw_packet->if_incoming == hard_iface)
483                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
484                 else
485                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
486 
487                 if (packet_num > 0 || !forw_packet->own)
488                         fwd_str = "Forwarding";
489                 else
490                         fwd_str = "Sending own";
491 
492                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
493                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
494                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
495                            batadv_ogm_packet->orig,
496                            ntohl(batadv_ogm_packet->seqno),
497                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
498                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
499                             "on" : "off"),
500                            hard_iface->net_dev->name,
501                            hard_iface->net_dev->dev_addr);
502 
503                 buff_pos += BATADV_OGM_HLEN;
504                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
505                 packet_num++;
506                 packet_pos = forw_packet->skb->data + buff_pos;
507                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
508         }
509 
510         /* create clone because function is called more than once */
511         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
512         if (skb) {
513                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
514                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
515                                    skb->len + ETH_HLEN);
516                 batadv_send_broadcast_skb(skb, hard_iface);
517         }
518 }
519 
520 /* send a batman ogm packet */
521 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
522 {
523         struct net_device *soft_iface;
524         struct batadv_priv *bat_priv;
525         struct batadv_hard_iface *primary_if = NULL;
526 
527         if (!forw_packet->if_incoming) {
528                 pr_err("Error - can't forward packet: incoming iface not specified\n");
529                 goto out;
530         }
531 
532         soft_iface = forw_packet->if_incoming->soft_iface;
533         bat_priv = netdev_priv(soft_iface);
534 
535         if (WARN_ON(!forw_packet->if_outgoing))
536                 goto out;
537 
538         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
539                 goto out;
540 
541         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
542                 goto out;
543 
544         primary_if = batadv_primary_if_get_selected(bat_priv);
545         if (!primary_if)
546                 goto out;
547 
548         /* only for one specific outgoing interface */
549         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
550 
551 out:
552         if (primary_if)
553                 batadv_hardif_put(primary_if);
554 }
555 
556 /**
557  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
558  *  existing forward packet
559  * @new_bat_ogm_packet: OGM packet to be aggregated
560  * @bat_priv: the bat priv with all the soft interface information
561  * @packet_len: (total) length of the OGM
562  * @send_time: timestamp (jiffies) when the packet is to be sent
563  * @directlink: true if this is a direct link packet
564  * @if_incoming: interface where the packet was received
565  * @if_outgoing: interface for which the retransmission should be considered
566  * @forw_packet: the forwarded packet which should be checked
567  *
568  * Return: true if new_packet can be aggregated with forw_packet
569  */
570 static bool
571 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
572                             struct batadv_priv *bat_priv,
573                             int packet_len, unsigned long send_time,
574                             bool directlink,
575                             const struct batadv_hard_iface *if_incoming,
576                             const struct batadv_hard_iface *if_outgoing,
577                             const struct batadv_forw_packet *forw_packet)
578 {
579         struct batadv_ogm_packet *batadv_ogm_packet;
580         int aggregated_bytes = forw_packet->packet_len + packet_len;
581         struct batadv_hard_iface *primary_if = NULL;
582         bool res = false;
583         unsigned long aggregation_end_time;
584 
585         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
586         aggregation_end_time = send_time;
587         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
588 
589         /* we can aggregate the current packet to this aggregated packet
590          * if:
591          *
592          * - the send time is within our MAX_AGGREGATION_MS time
593          * - the resulting packet wont be bigger than
594          *   MAX_AGGREGATION_BYTES
595          * otherwise aggregation is not possible
596          */
597         if (!time_before(send_time, forw_packet->send_time) ||
598             !time_after_eq(aggregation_end_time, forw_packet->send_time))
599                 return false;
600 
601         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
602                 return false;
603 
604         /* packet is not leaving on the same interface. */
605         if (forw_packet->if_outgoing != if_outgoing)
606                 return false;
607 
608         /* check aggregation compatibility
609          * -> direct link packets are broadcasted on
610          *    their interface only
611          * -> aggregate packet if the current packet is
612          *    a "global" packet as well as the base
613          *    packet
614          */
615         primary_if = batadv_primary_if_get_selected(bat_priv);
616         if (!primary_if)
617                 return false;
618 
619         /* packets without direct link flag and high TTL
620          * are flooded through the net
621          */
622         if (!directlink &&
623             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
624             batadv_ogm_packet->ttl != 1 &&
625 
626             /* own packets originating non-primary
627              * interfaces leave only that interface
628              */
629             (!forw_packet->own ||
630              forw_packet->if_incoming == primary_if)) {
631                 res = true;
632                 goto out;
633         }
634 
635         /* if the incoming packet is sent via this one
636          * interface only - we still can aggregate
637          */
638         if (directlink &&
639             new_bat_ogm_packet->ttl == 1 &&
640             forw_packet->if_incoming == if_incoming &&
641 
642             /* packets from direct neighbors or
643              * own secondary interface packets
644              * (= secondary interface packets in general)
645              */
646             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
647              (forw_packet->own &&
648               forw_packet->if_incoming != primary_if))) {
649                 res = true;
650                 goto out;
651         }
652 
653 out:
654         if (primary_if)
655                 batadv_hardif_put(primary_if);
656         return res;
657 }
658 
659 /**
660  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
661  *  packet to it.
662  * @packet_buff: pointer to the OGM
663  * @packet_len: (total) length of the OGM
664  * @send_time: timestamp (jiffies) when the packet is to be sent
665  * @direct_link: whether this OGM has direct link status
666  * @if_incoming: interface where the packet was received
667  * @if_outgoing: interface for which the retransmission should be considered
668  * @own_packet: true if it is a self-generated ogm
669  */
670 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
671                                         int packet_len, unsigned long send_time,
672                                         bool direct_link,
673                                         struct batadv_hard_iface *if_incoming,
674                                         struct batadv_hard_iface *if_outgoing,
675                                         int own_packet)
676 {
677         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
678         struct batadv_forw_packet *forw_packet_aggr;
679         unsigned char *skb_buff;
680         unsigned int skb_size;
681 
682         /* own packet should always be scheduled */
683         if (!own_packet) {
684                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
685                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
686                                    "batman packet queue full\n");
687                         return;
688                 }
689         }
690 
691         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
692         if (!forw_packet_aggr)
693                 goto out_nomem;
694 
695         if (atomic_read(&bat_priv->aggregated_ogms) &&
696             packet_len < BATADV_MAX_AGGREGATION_BYTES)
697                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
698         else
699                 skb_size = packet_len;
700 
701         skb_size += ETH_HLEN;
702 
703         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
704         if (!forw_packet_aggr->skb)
705                 goto out_free_forw_packet;
706         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
707         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
708 
709         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
710         forw_packet_aggr->packet_len = packet_len;
711         memcpy(skb_buff, packet_buff, packet_len);
712 
713         kref_get(&if_incoming->refcount);
714         kref_get(&if_outgoing->refcount);
715         forw_packet_aggr->own = own_packet;
716         forw_packet_aggr->if_incoming = if_incoming;
717         forw_packet_aggr->if_outgoing = if_outgoing;
718         forw_packet_aggr->num_packets = 0;
719         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
720         forw_packet_aggr->send_time = send_time;
721 
722         /* save packet direct link flag status */
723         if (direct_link)
724                 forw_packet_aggr->direct_link_flags |= 1;
725 
726         /* add new packet to packet list */
727         spin_lock_bh(&bat_priv->forw_bat_list_lock);
728         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
729         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
730 
731         /* start timer for this packet */
732         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
733                           batadv_send_outstanding_bat_ogm_packet);
734         queue_delayed_work(batadv_event_workqueue,
735                            &forw_packet_aggr->delayed_work,
736                            send_time - jiffies);
737 
738         return;
739 out_free_forw_packet:
740         kfree(forw_packet_aggr);
741 out_nomem:
742         if (!own_packet)
743                 atomic_inc(&bat_priv->batman_queue_left);
744 }
745 
746 /* aggregate a new packet into the existing ogm packet */
747 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
748                                     const unsigned char *packet_buff,
749                                     int packet_len, bool direct_link)
750 {
751         unsigned char *skb_buff;
752         unsigned long new_direct_link_flag;
753 
754         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
755         memcpy(skb_buff, packet_buff, packet_len);
756         forw_packet_aggr->packet_len += packet_len;
757         forw_packet_aggr->num_packets++;
758 
759         /* save packet direct link flag status */
760         if (direct_link) {
761                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
762                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
763         }
764 }
765 
766 /**
767  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
768  * @bat_priv: the bat priv with all the soft interface information
769  * @packet_buff: pointer to the OGM
770  * @packet_len: (total) length of the OGM
771  * @if_incoming: interface where the packet was received
772  * @if_outgoing: interface for which the retransmission should be considered
773  * @own_packet: true if it is a self-generated ogm
774  * @send_time: timestamp (jiffies) when the packet is to be sent
775  */
776 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
777                                     unsigned char *packet_buff,
778                                     int packet_len,
779                                     struct batadv_hard_iface *if_incoming,
780                                     struct batadv_hard_iface *if_outgoing,
781                                     int own_packet, unsigned long send_time)
782 {
783         /* _aggr -> pointer to the packet we want to aggregate with
784          * _pos -> pointer to the position in the queue
785          */
786         struct batadv_forw_packet *forw_packet_aggr = NULL;
787         struct batadv_forw_packet *forw_packet_pos = NULL;
788         struct batadv_ogm_packet *batadv_ogm_packet;
789         bool direct_link;
790         unsigned long max_aggregation_jiffies;
791 
792         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
793         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
794         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
795 
796         /* find position for the packet in the forward queue */
797         spin_lock_bh(&bat_priv->forw_bat_list_lock);
798         /* own packets are not to be aggregated */
799         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
800                 hlist_for_each_entry(forw_packet_pos,
801                                      &bat_priv->forw_bat_list, list) {
802                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
803                                                         bat_priv, packet_len,
804                                                         send_time, direct_link,
805                                                         if_incoming,
806                                                         if_outgoing,
807                                                         forw_packet_pos)) {
808                                 forw_packet_aggr = forw_packet_pos;
809                                 break;
810                         }
811                 }
812         }
813 
814         /* nothing to aggregate with - either aggregation disabled or no
815          * suitable aggregation packet found
816          */
817         if (!forw_packet_aggr) {
818                 /* the following section can run without the lock */
819                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
820 
821                 /* if we could not aggregate this packet with one of the others
822                  * we hold it back for a while, so that it might be aggregated
823                  * later on
824                  */
825                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
826                         send_time += max_aggregation_jiffies;
827 
828                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
829                                             send_time, direct_link,
830                                             if_incoming, if_outgoing,
831                                             own_packet);
832         } else {
833                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
834                                         packet_len, direct_link);
835                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
836         }
837 }
838 
839 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
840                                   const struct ethhdr *ethhdr,
841                                   struct batadv_ogm_packet *batadv_ogm_packet,
842                                   bool is_single_hop_neigh,
843                                   bool is_from_best_next_hop,
844                                   struct batadv_hard_iface *if_incoming,
845                                   struct batadv_hard_iface *if_outgoing)
846 {
847         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
848         u16 tvlv_len;
849 
850         if (batadv_ogm_packet->ttl <= 1) {
851                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
852                 return;
853         }
854 
855         if (!is_from_best_next_hop) {
856                 /* Mark the forwarded packet when it is not coming from our
857                  * best next hop. We still need to forward the packet for our
858                  * neighbor link quality detection to work in case the packet
859                  * originated from a single hop neighbor. Otherwise we can
860                  * simply drop the ogm.
861                  */
862                 if (is_single_hop_neigh)
863                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
864                 else
865                         return;
866         }
867 
868         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
869 
870         batadv_ogm_packet->ttl--;
871         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
872 
873         /* apply hop penalty */
874         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
875                                                    bat_priv);
876 
877         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
878                    "Forwarding packet: tq: %i, ttl: %i\n",
879                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
880 
881         if (is_single_hop_neigh)
882                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
883         else
884                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
885 
886         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
887                                 BATADV_OGM_HLEN + tvlv_len,
888                                 if_incoming, if_outgoing, 0,
889                                 batadv_iv_ogm_fwd_send_time());
890 }
891 
892 /**
893  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
894  * the given interface
895  * @hard_iface: the interface for which the windows have to be shifted
896  */
897 static void
898 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
899 {
900         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
901         struct batadv_hashtable *hash = bat_priv->orig_hash;
902         struct hlist_head *head;
903         struct batadv_orig_node *orig_node;
904         unsigned long *word;
905         u32 i;
906         size_t word_index;
907         u8 *w;
908         int if_num;
909 
910         for (i = 0; i < hash->size; i++) {
911                 head = &hash->table[i];
912 
913                 rcu_read_lock();
914                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
915                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
916                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
917                         word = &orig_node->bat_iv.bcast_own[word_index];
918 
919                         batadv_bit_get_packet(bat_priv, word, 1, 0);
920                         if_num = hard_iface->if_num;
921                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
922                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
923                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
924                 }
925                 rcu_read_unlock();
926         }
927 }
928 
929 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
930 {
931         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
932         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
933         struct batadv_ogm_packet *batadv_ogm_packet;
934         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
935         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
936         u32 seqno;
937         u16 tvlv_len = 0;
938         unsigned long send_time;
939 
940         primary_if = batadv_primary_if_get_selected(bat_priv);
941 
942         if (hard_iface == primary_if) {
943                 /* tt changes have to be committed before the tvlv data is
944                  * appended as it may alter the tt tvlv container
945                  */
946                 batadv_tt_local_commit_changes(bat_priv);
947                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
948                                                             ogm_buff_len,
949                                                             BATADV_OGM_HLEN);
950         }
951 
952         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
953         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
954 
955         /* change sequence number to network order */
956         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
957         batadv_ogm_packet->seqno = htonl(seqno);
958         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
959 
960         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
961 
962         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
963 
964         if (hard_iface != primary_if) {
965                 /* OGMs from secondary interfaces are only scheduled on their
966                  * respective interfaces.
967                  */
968                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
969                                         hard_iface, hard_iface, 1, send_time);
970                 goto out;
971         }
972 
973         /* OGMs from primary interfaces are scheduled on all
974          * interfaces.
975          */
976         rcu_read_lock();
977         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
978                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
979                         continue;
980 
981                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
982                         continue;
983 
984                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
985                                         *ogm_buff_len, hard_iface,
986                                         tmp_hard_iface, 1, send_time);
987 
988                 batadv_hardif_put(tmp_hard_iface);
989         }
990         rcu_read_unlock();
991 
992 out:
993         if (primary_if)
994                 batadv_hardif_put(primary_if);
995 }
996 
997 /**
998  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
999  *  originator
1000  * @bat_priv: the bat priv with all the soft interface information
1001  * @orig_node: the orig node who originally emitted the ogm packet
1002  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1003  * @ethhdr: Ethernet header of the OGM
1004  * @batadv_ogm_packet: the ogm packet
1005  * @if_incoming: interface where the packet was received
1006  * @if_outgoing: interface for which the retransmission should be considered
1007  * @dup_status: the duplicate status of this ogm packet.
1008  */
1009 static void
1010 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1011                           struct batadv_orig_node *orig_node,
1012                           struct batadv_orig_ifinfo *orig_ifinfo,
1013                           const struct ethhdr *ethhdr,
1014                           const struct batadv_ogm_packet *batadv_ogm_packet,
1015                           struct batadv_hard_iface *if_incoming,
1016                           struct batadv_hard_iface *if_outgoing,
1017                           enum batadv_dup_status dup_status)
1018 {
1019         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1020         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1021         struct batadv_neigh_node *neigh_node = NULL;
1022         struct batadv_neigh_node *tmp_neigh_node = NULL;
1023         struct batadv_neigh_node *router = NULL;
1024         struct batadv_orig_node *orig_node_tmp;
1025         int if_num;
1026         u8 sum_orig, sum_neigh;
1027         u8 *neigh_addr;
1028         u8 tq_avg;
1029 
1030         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1031                    "update_originator(): Searching and updating originator entry of received packet\n");
1032 
1033         rcu_read_lock();
1034         hlist_for_each_entry_rcu(tmp_neigh_node,
1035                                  &orig_node->neigh_list, list) {
1036                 neigh_addr = tmp_neigh_node->addr;
1037                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1038                     tmp_neigh_node->if_incoming == if_incoming &&
1039                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1040                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1041                                 batadv_neigh_node_put(neigh_node);
1042                         neigh_node = tmp_neigh_node;
1043                         continue;
1044                 }
1045 
1046                 if (dup_status != BATADV_NO_DUP)
1047                         continue;
1048 
1049                 /* only update the entry for this outgoing interface */
1050                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1051                                                        if_outgoing);
1052                 if (!neigh_ifinfo)
1053                         continue;
1054 
1055                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1056                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1057                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1058                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1059                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1060                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1061 
1062                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1063                 neigh_ifinfo = NULL;
1064         }
1065 
1066         if (!neigh_node) {
1067                 struct batadv_orig_node *orig_tmp;
1068 
1069                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1070                 if (!orig_tmp)
1071                         goto unlock;
1072 
1073                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1074                                                      ethhdr->h_source,
1075                                                      orig_node, orig_tmp);
1076 
1077                 batadv_orig_node_put(orig_tmp);
1078                 if (!neigh_node)
1079                         goto unlock;
1080         } else {
1081                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1082                            "Updating existing last-hop neighbor of originator\n");
1083         }
1084 
1085         rcu_read_unlock();
1086         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1087         if (!neigh_ifinfo)
1088                 goto out;
1089 
1090         neigh_node->last_seen = jiffies;
1091 
1092         spin_lock_bh(&neigh_node->ifinfo_lock);
1093         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1094                                &neigh_ifinfo->bat_iv.tq_index,
1095                                batadv_ogm_packet->tq);
1096         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1097         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1098         spin_unlock_bh(&neigh_node->ifinfo_lock);
1099 
1100         if (dup_status == BATADV_NO_DUP) {
1101                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1102                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1103         }
1104 
1105         /* if this neighbor already is our next hop there is nothing
1106          * to change
1107          */
1108         router = batadv_orig_router_get(orig_node, if_outgoing);
1109         if (router == neigh_node)
1110                 goto out;
1111 
1112         if (router) {
1113                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1114                 if (!router_ifinfo)
1115                         goto out;
1116 
1117                 /* if this neighbor does not offer a better TQ we won't
1118                  * consider it
1119                  */
1120                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1121                         goto out;
1122         }
1123 
1124         /* if the TQ is the same and the link not more symmetric we
1125          * won't consider it either
1126          */
1127         if (router_ifinfo &&
1128             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1129                 orig_node_tmp = router->orig_node;
1130                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1131                 if_num = router->if_incoming->if_num;
1132                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1133                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1134 
1135                 orig_node_tmp = neigh_node->orig_node;
1136                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1137                 if_num = neigh_node->if_incoming->if_num;
1138                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1139                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1140 
1141                 if (sum_orig >= sum_neigh)
1142                         goto out;
1143         }
1144 
1145         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1146         goto out;
1147 
1148 unlock:
1149         rcu_read_unlock();
1150 out:
1151         if (neigh_node)
1152                 batadv_neigh_node_put(neigh_node);
1153         if (router)
1154                 batadv_neigh_node_put(router);
1155         if (neigh_ifinfo)
1156                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1157         if (router_ifinfo)
1158                 batadv_neigh_ifinfo_put(router_ifinfo);
1159 }
1160 
1161 /**
1162  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1163  * @orig_node: the orig node who originally emitted the ogm packet
1164  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1165  * @batadv_ogm_packet: the ogm packet
1166  * @if_incoming: interface where the packet was received
1167  * @if_outgoing: interface for which the retransmission should be considered
1168  *
1169  * Return: true if the link can be considered bidirectional, false otherwise
1170  */
1171 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1172                                   struct batadv_orig_node *orig_neigh_node,
1173                                   struct batadv_ogm_packet *batadv_ogm_packet,
1174                                   struct batadv_hard_iface *if_incoming,
1175                                   struct batadv_hard_iface *if_outgoing)
1176 {
1177         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1178         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1179         struct batadv_neigh_ifinfo *neigh_ifinfo;
1180         u8 total_count;
1181         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1182         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1183         int if_num;
1184         unsigned int tq_asym_penalty, inv_asym_penalty;
1185         unsigned int combined_tq;
1186         unsigned int tq_iface_penalty;
1187         bool ret = false;
1188 
1189         /* find corresponding one hop neighbor */
1190         rcu_read_lock();
1191         hlist_for_each_entry_rcu(tmp_neigh_node,
1192                                  &orig_neigh_node->neigh_list, list) {
1193                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1194                                         orig_neigh_node->orig))
1195                         continue;
1196 
1197                 if (tmp_neigh_node->if_incoming != if_incoming)
1198                         continue;
1199 
1200                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1201                         continue;
1202 
1203                 neigh_node = tmp_neigh_node;
1204                 break;
1205         }
1206         rcu_read_unlock();
1207 
1208         if (!neigh_node)
1209                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1210                                                      orig_neigh_node->orig,
1211                                                      orig_neigh_node,
1212                                                      orig_neigh_node);
1213 
1214         if (!neigh_node)
1215                 goto out;
1216 
1217         /* if orig_node is direct neighbor update neigh_node last_seen */
1218         if (orig_node == orig_neigh_node)
1219                 neigh_node->last_seen = jiffies;
1220 
1221         orig_node->last_seen = jiffies;
1222 
1223         /* find packet count of corresponding one hop neighbor */
1224         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1225         if_num = if_incoming->if_num;
1226         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1227         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1228         if (neigh_ifinfo) {
1229                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1230                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1231         } else {
1232                 neigh_rq_count = 0;
1233         }
1234         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1235 
1236         /* pay attention to not get a value bigger than 100 % */
1237         if (orig_eq_count > neigh_rq_count)
1238                 total_count = neigh_rq_count;
1239         else
1240                 total_count = orig_eq_count;
1241 
1242         /* if we have too few packets (too less data) we set tq_own to zero
1243          * if we receive too few packets it is not considered bidirectional
1244          */
1245         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1246             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1247                 tq_own = 0;
1248         else
1249                 /* neigh_node->real_packet_count is never zero as we
1250                  * only purge old information when getting new
1251                  * information
1252                  */
1253                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1254 
1255         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1256          * affect the nearly-symmetric links only a little, but
1257          * punishes asymmetric links more.  This will give a value
1258          * between 0 and TQ_MAX_VALUE
1259          */
1260         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1261         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1262         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1263                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1264                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1265         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1266         inv_asym_penalty /= neigh_rq_max_cube;
1267         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1268 
1269         /* penalize if the OGM is forwarded on the same interface. WiFi
1270          * interfaces and other half duplex devices suffer from throughput
1271          * drops as they can't send and receive at the same time.
1272          */
1273         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1274         if (if_outgoing && (if_incoming == if_outgoing) &&
1275             batadv_is_wifi_netdev(if_outgoing->net_dev))
1276                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1277                                                       bat_priv);
1278 
1279         combined_tq = batadv_ogm_packet->tq *
1280                       tq_own *
1281                       tq_asym_penalty *
1282                       tq_iface_penalty;
1283         combined_tq /= BATADV_TQ_MAX_VALUE *
1284                        BATADV_TQ_MAX_VALUE *
1285                        BATADV_TQ_MAX_VALUE;
1286         batadv_ogm_packet->tq = combined_tq;
1287 
1288         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1289                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
1290                    orig_node->orig, orig_neigh_node->orig, total_count,
1291                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1292                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1293                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1294 
1295         /* if link has the minimum required transmission quality
1296          * consider it bidirectional
1297          */
1298         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1299                 ret = true;
1300 
1301 out:
1302         if (neigh_node)
1303                 batadv_neigh_node_put(neigh_node);
1304         return ret;
1305 }
1306 
1307 /**
1308  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1309  *  adjust the sequence number and find out whether it is a duplicate
1310  * @ethhdr: ethernet header of the packet
1311  * @batadv_ogm_packet: OGM packet to be considered
1312  * @if_incoming: interface on which the OGM packet was received
1313  * @if_outgoing: interface for which the retransmission should be considered
1314  *
1315  * Return: duplicate status as enum batadv_dup_status
1316  */
1317 static enum batadv_dup_status
1318 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1319                             const struct batadv_ogm_packet *batadv_ogm_packet,
1320                             const struct batadv_hard_iface *if_incoming,
1321                             struct batadv_hard_iface *if_outgoing)
1322 {
1323         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1324         struct batadv_orig_node *orig_node;
1325         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1326         struct batadv_neigh_node *neigh_node;
1327         struct batadv_neigh_ifinfo *neigh_ifinfo;
1328         bool is_dup;
1329         s32 seq_diff;
1330         bool need_update = false;
1331         int set_mark;
1332         enum batadv_dup_status ret = BATADV_NO_DUP;
1333         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1334         u8 *neigh_addr;
1335         u8 packet_count;
1336         unsigned long *bitmap;
1337 
1338         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1339         if (!orig_node)
1340                 return BATADV_NO_DUP;
1341 
1342         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1343         if (WARN_ON(!orig_ifinfo)) {
1344                 batadv_orig_node_put(orig_node);
1345                 return 0;
1346         }
1347 
1348         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1349         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1350 
1351         /* signalize caller that the packet is to be dropped. */
1352         if (!hlist_empty(&orig_node->neigh_list) &&
1353             batadv_window_protected(bat_priv, seq_diff,
1354                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1355                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1356                 ret = BATADV_PROTECTED;
1357                 goto out;
1358         }
1359 
1360         rcu_read_lock();
1361         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1362                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1363                                                        if_outgoing);
1364                 if (!neigh_ifinfo)
1365                         continue;
1366 
1367                 neigh_addr = neigh_node->addr;
1368                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1369                                          orig_ifinfo->last_real_seqno,
1370                                          seqno);
1371 
1372                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1373                     neigh_node->if_incoming == if_incoming) {
1374                         set_mark = 1;
1375                         if (is_dup)
1376                                 ret = BATADV_NEIGH_DUP;
1377                 } else {
1378                         set_mark = 0;
1379                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1380                                 ret = BATADV_ORIG_DUP;
1381                 }
1382 
1383                 /* if the window moved, set the update flag. */
1384                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1385                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1386                                                      seq_diff, set_mark);
1387 
1388                 packet_count = bitmap_weight(bitmap,
1389                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1390                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1391                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1392         }
1393         rcu_read_unlock();
1394 
1395         if (need_update) {
1396                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1397                            "%s updating last_seqno: old %u, new %u\n",
1398                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1399                            orig_ifinfo->last_real_seqno, seqno);
1400                 orig_ifinfo->last_real_seqno = seqno;
1401         }
1402 
1403 out:
1404         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1405         batadv_orig_node_put(orig_node);
1406         batadv_orig_ifinfo_put(orig_ifinfo);
1407         return ret;
1408 }
1409 
1410 /**
1411  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1412  * @skb: the skb containing the OGM
1413  * @ogm_offset: offset from skb->data to start of ogm header
1414  * @orig_node: the (cached) orig node for the originator of this OGM
1415  * @if_incoming: the interface where this packet was received
1416  * @if_outgoing: the interface for which the packet should be considered
1417  */
1418 static void
1419 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1420                                 struct batadv_orig_node *orig_node,
1421                                 struct batadv_hard_iface *if_incoming,
1422                                 struct batadv_hard_iface *if_outgoing)
1423 {
1424         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1425         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1426         struct batadv_neigh_node *router = NULL;
1427         struct batadv_neigh_node *router_router = NULL;
1428         struct batadv_orig_node *orig_neigh_node;
1429         struct batadv_orig_ifinfo *orig_ifinfo;
1430         struct batadv_neigh_node *orig_neigh_router = NULL;
1431         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1432         struct batadv_ogm_packet *ogm_packet;
1433         enum batadv_dup_status dup_status;
1434         bool is_from_best_next_hop = false;
1435         bool is_single_hop_neigh = false;
1436         bool sameseq, similar_ttl;
1437         struct sk_buff *skb_priv;
1438         struct ethhdr *ethhdr;
1439         u8 *prev_sender;
1440         bool is_bidirect;
1441 
1442         /* create a private copy of the skb, as some functions change tq value
1443          * and/or flags.
1444          */
1445         skb_priv = skb_copy(skb, GFP_ATOMIC);
1446         if (!skb_priv)
1447                 return;
1448 
1449         ethhdr = eth_hdr(skb_priv);
1450         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1451 
1452         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1453                                                  if_incoming, if_outgoing);
1454         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1455                 is_single_hop_neigh = true;
1456 
1457         if (dup_status == BATADV_PROTECTED) {
1458                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1459                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1460                            ethhdr->h_source);
1461                 goto out;
1462         }
1463 
1464         if (ogm_packet->tq == 0) {
1465                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1466                            "Drop packet: originator packet with tq equal 0\n");
1467                 goto out;
1468         }
1469 
1470         if (is_single_hop_neigh) {
1471                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1472                                                        ethhdr->h_source);
1473                 if (hardif_neigh)
1474                         hardif_neigh->last_seen = jiffies;
1475         }
1476 
1477         router = batadv_orig_router_get(orig_node, if_outgoing);
1478         if (router) {
1479                 router_router = batadv_orig_router_get(router->orig_node,
1480                                                        if_outgoing);
1481                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1482         }
1483 
1484         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1485             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1486                 is_from_best_next_hop = true;
1487 
1488         prev_sender = ogm_packet->prev_sender;
1489         /* avoid temporary routing loops */
1490         if (router && router_router &&
1491             (batadv_compare_eth(router->addr, prev_sender)) &&
1492             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1493             (batadv_compare_eth(router->addr, router_router->addr))) {
1494                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1495                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1496                            ethhdr->h_source);
1497                 goto out;
1498         }
1499 
1500         if (if_outgoing == BATADV_IF_DEFAULT)
1501                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1502 
1503         /* if sender is a direct neighbor the sender mac equals
1504          * originator mac
1505          */
1506         if (is_single_hop_neigh)
1507                 orig_neigh_node = orig_node;
1508         else
1509                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1510                                                          ethhdr->h_source);
1511 
1512         if (!orig_neigh_node)
1513                 goto out;
1514 
1515         /* Update nc_nodes of the originator */
1516         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1517                                  ogm_packet, is_single_hop_neigh);
1518 
1519         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1520                                                    if_outgoing);
1521 
1522         /* drop packet if sender is not a direct neighbor and if we
1523          * don't route towards it
1524          */
1525         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1526                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1527                            "Drop packet: OGM via unknown neighbor!\n");
1528                 goto out_neigh;
1529         }
1530 
1531         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1532                                             ogm_packet, if_incoming,
1533                                             if_outgoing);
1534 
1535         /* update ranking if it is not a duplicate or has the same
1536          * seqno and similar ttl as the non-duplicate
1537          */
1538         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1539         if (!orig_ifinfo)
1540                 goto out_neigh;
1541 
1542         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1543         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1544 
1545         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1546                             (sameseq && similar_ttl))) {
1547                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1548                                           orig_ifinfo, ethhdr,
1549                                           ogm_packet, if_incoming,
1550                                           if_outgoing, dup_status);
1551         }
1552         batadv_orig_ifinfo_put(orig_ifinfo);
1553 
1554         /* only forward for specific interface, not for the default one. */
1555         if (if_outgoing == BATADV_IF_DEFAULT)
1556                 goto out_neigh;
1557 
1558         /* is single hop (direct) neighbor */
1559         if (is_single_hop_neigh) {
1560                 /* OGMs from secondary interfaces should only scheduled once
1561                  * per interface where it has been received, not multiple times
1562                  */
1563                 if ((ogm_packet->ttl <= 2) &&
1564                     (if_incoming != if_outgoing)) {
1565                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1566                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1567                         goto out_neigh;
1568                 }
1569                 /* mark direct link on incoming interface */
1570                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1571                                       is_single_hop_neigh,
1572                                       is_from_best_next_hop, if_incoming,
1573                                       if_outgoing);
1574 
1575                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1576                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1577                 goto out_neigh;
1578         }
1579 
1580         /* multihop originator */
1581         if (!is_bidirect) {
1582                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1583                            "Drop packet: not received via bidirectional link\n");
1584                 goto out_neigh;
1585         }
1586 
1587         if (dup_status == BATADV_NEIGH_DUP) {
1588                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1589                            "Drop packet: duplicate packet received\n");
1590                 goto out_neigh;
1591         }
1592 
1593         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1594                    "Forwarding packet: rebroadcast originator packet\n");
1595         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1596                               is_single_hop_neigh, is_from_best_next_hop,
1597                               if_incoming, if_outgoing);
1598 
1599 out_neigh:
1600         if ((orig_neigh_node) && (!is_single_hop_neigh))
1601                 batadv_orig_node_put(orig_neigh_node);
1602 out:
1603         if (router_ifinfo)
1604                 batadv_neigh_ifinfo_put(router_ifinfo);
1605         if (router)
1606                 batadv_neigh_node_put(router);
1607         if (router_router)
1608                 batadv_neigh_node_put(router_router);
1609         if (orig_neigh_router)
1610                 batadv_neigh_node_put(orig_neigh_router);
1611         if (hardif_neigh)
1612                 batadv_hardif_neigh_put(hardif_neigh);
1613 
1614         kfree_skb(skb_priv);
1615 }
1616 
1617 /**
1618  * batadv_iv_ogm_process - process an incoming batman iv OGM
1619  * @skb: the skb containing the OGM
1620  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1621  * @if_incoming: the interface where this packet was receved
1622  */
1623 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1624                                   struct batadv_hard_iface *if_incoming)
1625 {
1626         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1627         struct batadv_orig_node *orig_neigh_node, *orig_node;
1628         struct batadv_hard_iface *hard_iface;
1629         struct batadv_ogm_packet *ogm_packet;
1630         u32 if_incoming_seqno;
1631         bool has_directlink_flag;
1632         struct ethhdr *ethhdr;
1633         bool is_my_oldorig = false;
1634         bool is_my_addr = false;
1635         bool is_my_orig = false;
1636 
1637         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1638         ethhdr = eth_hdr(skb);
1639 
1640         /* Silently drop when the batman packet is actually not a
1641          * correct packet.
1642          *
1643          * This might happen if a packet is padded (e.g. Ethernet has a
1644          * minimum frame length of 64 byte) and the aggregation interprets
1645          * it as an additional length.
1646          *
1647          * TODO: A more sane solution would be to have a bit in the
1648          * batadv_ogm_packet to detect whether the packet is the last
1649          * packet in an aggregation.  Here we expect that the padding
1650          * is always zero (or not 0x01)
1651          */
1652         if (ogm_packet->packet_type != BATADV_IV_OGM)
1653                 return;
1654 
1655         /* could be changed by schedule_own_packet() */
1656         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1657 
1658         if (ogm_packet->flags & BATADV_DIRECTLINK)
1659                 has_directlink_flag = true;
1660         else
1661                 has_directlink_flag = false;
1662 
1663         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1664                    "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
1665                    ethhdr->h_source, if_incoming->net_dev->name,
1666                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1667                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1668                    ogm_packet->tq, ogm_packet->ttl,
1669                    ogm_packet->version, has_directlink_flag);
1670 
1671         rcu_read_lock();
1672         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1673                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1674                         continue;
1675 
1676                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1677                         continue;
1678 
1679                 if (batadv_compare_eth(ethhdr->h_source,
1680                                        hard_iface->net_dev->dev_addr))
1681                         is_my_addr = true;
1682 
1683                 if (batadv_compare_eth(ogm_packet->orig,
1684                                        hard_iface->net_dev->dev_addr))
1685                         is_my_orig = true;
1686 
1687                 if (batadv_compare_eth(ogm_packet->prev_sender,
1688                                        hard_iface->net_dev->dev_addr))
1689                         is_my_oldorig = true;
1690         }
1691         rcu_read_unlock();
1692 
1693         if (is_my_addr) {
1694                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1695                            "Drop packet: received my own broadcast (sender: %pM)\n",
1696                            ethhdr->h_source);
1697                 return;
1698         }
1699 
1700         if (is_my_orig) {
1701                 unsigned long *word;
1702                 int offset;
1703                 s32 bit_pos;
1704                 s16 if_num;
1705                 u8 *weight;
1706 
1707                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1708                                                          ethhdr->h_source);
1709                 if (!orig_neigh_node)
1710                         return;
1711 
1712                 /* neighbor has to indicate direct link and it has to
1713                  * come via the corresponding interface
1714                  * save packet seqno for bidirectional check
1715                  */
1716                 if (has_directlink_flag &&
1717                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1718                                        ogm_packet->orig)) {
1719                         if_num = if_incoming->if_num;
1720                         offset = if_num * BATADV_NUM_WORDS;
1721 
1722                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1723                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1724                         bit_pos = if_incoming_seqno - 2;
1725                         bit_pos -= ntohl(ogm_packet->seqno);
1726                         batadv_set_bit(word, bit_pos);
1727                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1728                         *weight = bitmap_weight(word,
1729                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1730                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1731                 }
1732 
1733                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1734                            "Drop packet: originator packet from myself (via neighbor)\n");
1735                 batadv_orig_node_put(orig_neigh_node);
1736                 return;
1737         }
1738 
1739         if (is_my_oldorig) {
1740                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1741                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1742                            ethhdr->h_source);
1743                 return;
1744         }
1745 
1746         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1747                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1748                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1749                            ethhdr->h_source);
1750                 return;
1751         }
1752 
1753         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1754         if (!orig_node)
1755                 return;
1756 
1757         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1758                                         if_incoming, BATADV_IF_DEFAULT);
1759 
1760         rcu_read_lock();
1761         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1762                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1763                         continue;
1764 
1765                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1766                         continue;
1767 
1768                 if (!kref_get_unless_zero(&hard_iface->refcount))
1769                         continue;
1770 
1771                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1772                                                 if_incoming, hard_iface);
1773 
1774                 batadv_hardif_put(hard_iface);
1775         }
1776         rcu_read_unlock();
1777 
1778         batadv_orig_node_put(orig_node);
1779 }
1780 
1781 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1782                                  struct batadv_hard_iface *if_incoming)
1783 {
1784         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1785         struct batadv_ogm_packet *ogm_packet;
1786         u8 *packet_pos;
1787         int ogm_offset;
1788         bool ret;
1789 
1790         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1791         if (!ret)
1792                 return NET_RX_DROP;
1793 
1794         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1795          * that does not have B.A.T.M.A.N. IV enabled ?
1796          */
1797         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1798                 return NET_RX_DROP;
1799 
1800         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1801         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1802                            skb->len + ETH_HLEN);
1803 
1804         ogm_offset = 0;
1805         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1806 
1807         /* unpack the aggregated packets and process them one by one */
1808         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1809                                          ogm_packet->tvlv_len)) {
1810                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1811 
1812                 ogm_offset += BATADV_OGM_HLEN;
1813                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1814 
1815                 packet_pos = skb->data + ogm_offset;
1816                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1817         }
1818 
1819         kfree_skb(skb);
1820         return NET_RX_SUCCESS;
1821 }
1822 
1823 /**
1824  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1825  * @orig_node: the orig_node for which the neighbors are printed
1826  * @if_outgoing: outgoing interface for these entries
1827  * @seq: debugfs table seq_file struct
1828  *
1829  * Must be called while holding an rcu lock.
1830  */
1831 static void
1832 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1833                                struct batadv_hard_iface *if_outgoing,
1834                                struct seq_file *seq)
1835 {
1836         struct batadv_neigh_node *neigh_node;
1837         struct batadv_neigh_ifinfo *n_ifinfo;
1838 
1839         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1840                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1841                 if (!n_ifinfo)
1842                         continue;
1843 
1844                 seq_printf(seq, " %pM (%3i)",
1845                            neigh_node->addr,
1846                            n_ifinfo->bat_iv.tq_avg);
1847 
1848                 batadv_neigh_ifinfo_put(n_ifinfo);
1849         }
1850 }
1851 
1852 /**
1853  * batadv_iv_ogm_orig_print - print the originator table
1854  * @bat_priv: the bat priv with all the soft interface information
1855  * @seq: debugfs table seq_file struct
1856  * @if_outgoing: the outgoing interface for which this should be printed
1857  */
1858 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1859                                      struct seq_file *seq,
1860                                      struct batadv_hard_iface *if_outgoing)
1861 {
1862         struct batadv_neigh_node *neigh_node;
1863         struct batadv_hashtable *hash = bat_priv->orig_hash;
1864         int last_seen_msecs, last_seen_secs;
1865         struct batadv_orig_node *orig_node;
1866         struct batadv_neigh_ifinfo *n_ifinfo;
1867         unsigned long last_seen_jiffies;
1868         struct hlist_head *head;
1869         int batman_count = 0;
1870         u32 i;
1871 
1872         seq_puts(seq,
1873                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1874 
1875         for (i = 0; i < hash->size; i++) {
1876                 head = &hash->table[i];
1877 
1878                 rcu_read_lock();
1879                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1880                         neigh_node = batadv_orig_router_get(orig_node,
1881                                                             if_outgoing);
1882                         if (!neigh_node)
1883                                 continue;
1884 
1885                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1886                                                            if_outgoing);
1887                         if (!n_ifinfo)
1888                                 goto next;
1889 
1890                         if (n_ifinfo->bat_iv.tq_avg == 0)
1891                                 goto next;
1892 
1893                         last_seen_jiffies = jiffies - orig_node->last_seen;
1894                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1895                         last_seen_secs = last_seen_msecs / 1000;
1896                         last_seen_msecs = last_seen_msecs % 1000;
1897 
1898                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1899                                    orig_node->orig, last_seen_secs,
1900                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1901                                    neigh_node->addr,
1902                                    neigh_node->if_incoming->net_dev->name);
1903 
1904                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1905                                                        seq);
1906                         seq_puts(seq, "\n");
1907                         batman_count++;
1908 
1909 next:
1910                         batadv_neigh_node_put(neigh_node);
1911                         if (n_ifinfo)
1912                                 batadv_neigh_ifinfo_put(n_ifinfo);
1913                 }
1914                 rcu_read_unlock();
1915         }
1916 
1917         if (batman_count == 0)
1918                 seq_puts(seq, "No batman nodes in range ...\n");
1919 }
1920 
1921 /**
1922  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1923  * @seq: neighbour table seq_file struct
1924  * @hardif_neigh: hardif neighbour information
1925  */
1926 static void
1927 batadv_iv_hardif_neigh_print(struct seq_file *seq,
1928                              struct batadv_hardif_neigh_node *hardif_neigh)
1929 {
1930         int last_secs, last_msecs;
1931 
1932         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1933         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1934 
1935         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
1936                    hardif_neigh->if_incoming->net_dev->name,
1937                    hardif_neigh->addr, last_secs, last_msecs);
1938 }
1939 
1940 /**
1941  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1942  * @bat_priv: the bat priv with all the soft interface information
1943  * @seq: neighbour table seq_file struct
1944  */
1945 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1946                                   struct seq_file *seq)
1947 {
1948         struct net_device *net_dev = (struct net_device *)seq->private;
1949         struct batadv_hardif_neigh_node *hardif_neigh;
1950         struct batadv_hard_iface *hard_iface;
1951         int batman_count = 0;
1952 
1953         seq_puts(seq, "           IF        Neighbor      last-seen\n");
1954 
1955         rcu_read_lock();
1956         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1957                 if (hard_iface->soft_iface != net_dev)
1958                         continue;
1959 
1960                 hlist_for_each_entry_rcu(hardif_neigh,
1961                                          &hard_iface->neigh_list, list) {
1962                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1963                         batman_count++;
1964                 }
1965         }
1966         rcu_read_unlock();
1967 
1968         if (batman_count == 0)
1969                 seq_puts(seq, "No batman nodes in range ...\n");
1970 }
1971 
1972 /**
1973  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1974  * @neigh1: the first neighbor object of the comparison
1975  * @if_outgoing1: outgoing interface for the first neighbor
1976  * @neigh2: the second neighbor object of the comparison
1977  * @if_outgoing2: outgoing interface for the second neighbor
1978  *
1979  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
1980  * lower, the same as or higher than the metric via neigh2
1981  */
1982 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1983                                    struct batadv_hard_iface *if_outgoing1,
1984                                    struct batadv_neigh_node *neigh2,
1985                                    struct batadv_hard_iface *if_outgoing2)
1986 {
1987         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1988         u8 tq1, tq2;
1989         int diff;
1990 
1991         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1992         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1993 
1994         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1995                 diff = 0;
1996                 goto out;
1997         }
1998 
1999         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2000         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2001         diff = tq1 - tq2;
2002 
2003 out:
2004         if (neigh1_ifinfo)
2005                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2006         if (neigh2_ifinfo)
2007                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2008 
2009         return diff;
2010 }
2011 
2012 /**
2013  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2014  *  than neigh2 from the metric prospective
2015  * @neigh1: the first neighbor object of the comparison
2016  * @if_outgoing1: outgoing interface for the first neighbor
2017  * @neigh2: the second neighbor object of the comparison
2018  * @if_outgoing2: outgoing interface for the second neighbor
2019  *
2020  * Return: true if the metric via neigh1 is equally good or better than
2021  * the metric via neigh2, false otherwise.
2022  */
2023 static bool
2024 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2025                            struct batadv_hard_iface *if_outgoing1,
2026                            struct batadv_neigh_node *neigh2,
2027                            struct batadv_hard_iface *if_outgoing2)
2028 {
2029         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2030         u8 tq1, tq2;
2031         bool ret;
2032 
2033         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2034         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2035 
2036         /* we can't say that the metric is better */
2037         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2038                 ret = false;
2039                 goto out;
2040         }
2041 
2042         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2043         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2044         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
2045 
2046 out:
2047         if (neigh1_ifinfo)
2048                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2049         if (neigh2_ifinfo)
2050                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2051 
2052         return ret;
2053 }
2054 
2055 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2056         .name = "BATMAN_IV",
2057         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2058         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2059         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2060         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2061         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2062         .bat_ogm_emit = batadv_iv_ogm_emit,
2063         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2064         .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2065         .bat_neigh_print = batadv_iv_neigh_print,
2066         .bat_orig_print = batadv_iv_ogm_orig_print,
2067         .bat_orig_free = batadv_iv_ogm_orig_free,
2068         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2069         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2070 };
2071 
2072 int __init batadv_iv_init(void)
2073 {
2074         int ret;
2075 
2076         /* batman originator packet */
2077         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2078                                            batadv_iv_ogm_receive);
2079         if (ret < 0)
2080                 goto out;
2081 
2082         ret = batadv_algo_register(&batadv_batman_iv);
2083         if (ret < 0)
2084                 goto handler_unregister;
2085 
2086         goto out;
2087 
2088 handler_unregister:
2089         batadv_recv_handler_unregister(BATADV_IV_OGM);
2090 out:
2091         return ret;
2092 }
2093 

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