1 /* Copyright (C) 2008-2012 B.A.T.M.A.N. contributors:
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include "translation-table.h"
24 #include "soft-interface.h"
25 #include "hard-interface.h"
27 #include "originator.h"
29 #define BATADV_MAX_VIS_PACKET_SIZE 1000
31 static void batadv_start_vis_timer(struct bat_priv *bat_priv);
34 static void batadv_free_info(struct kref *ref)
36 struct vis_info *info = container_of(ref, struct vis_info, refcount);
37 struct bat_priv *bat_priv = info->bat_priv;
38 struct recvlist_node *entry, *tmp;
40 list_del_init(&info->send_list);
41 spin_lock_bh(&bat_priv->vis_list_lock);
42 list_for_each_entry_safe(entry, tmp, &info->recv_list, list) {
43 list_del(&entry->list);
47 spin_unlock_bh(&bat_priv->vis_list_lock);
48 kfree_skb(info->skb_packet);
52 /* Compare two vis packets, used by the hashing algorithm */
53 static int batadv_vis_info_cmp(const struct hlist_node *node, const void *data2)
55 const struct vis_info *d1, *d2;
56 const struct vis_packet *p1, *p2;
58 d1 = container_of(node, struct vis_info, hash_entry);
60 p1 = (struct vis_packet *)d1->skb_packet->data;
61 p2 = (struct vis_packet *)d2->skb_packet->data;
62 return batadv_compare_eth(p1->vis_orig, p2->vis_orig);
65 /* hash function to choose an entry in a hash table of given size
66 * hash algorithm from http://en.wikipedia.org/wiki/Hash_table
68 static uint32_t batadv_vis_info_choose(const void *data, uint32_t size)
70 const struct vis_info *vis_info = data;
71 const struct vis_packet *packet;
72 const unsigned char *key;
76 packet = (struct vis_packet *)vis_info->skb_packet->data;
77 key = packet->vis_orig;
78 for (i = 0; i < ETH_ALEN; i++) {
91 static struct vis_info *batadv_vis_hash_find(struct bat_priv *bat_priv,
94 struct hashtable_t *hash = bat_priv->vis_hash;
95 struct hlist_head *head;
96 struct hlist_node *node;
97 struct vis_info *vis_info, *vis_info_tmp = NULL;
103 index = batadv_vis_info_choose(data, hash->size);
104 head = &hash->table[index];
107 hlist_for_each_entry_rcu(vis_info, node, head, hash_entry) {
108 if (!batadv_vis_info_cmp(node, data))
111 vis_info_tmp = vis_info;
119 /* insert interface to the list of interfaces of one originator, if it
120 * does not already exist in the list
122 static void batadv_vis_data_insert_interface(const uint8_t *interface,
123 struct hlist_head *if_list,
126 struct if_list_entry *entry;
127 struct hlist_node *pos;
129 hlist_for_each_entry(entry, pos, if_list, list) {
130 if (batadv_compare_eth(entry->addr, interface))
134 /* it's a new address, add it to the list */
135 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
138 memcpy(entry->addr, interface, ETH_ALEN);
139 entry->primary = primary;
140 hlist_add_head(&entry->list, if_list);
143 static void batadv_vis_data_read_prim_sec(struct seq_file *seq,
144 const struct hlist_head *if_list)
146 struct if_list_entry *entry;
147 struct hlist_node *pos;
149 hlist_for_each_entry(entry, pos, if_list, list) {
151 seq_printf(seq, "PRIMARY, ");
153 seq_printf(seq, "SEC %pM, ", entry->addr);
158 static ssize_t batadv_vis_data_read_entry(struct seq_file *seq,
159 const struct vis_info_entry *entry,
160 const uint8_t *src, bool primary)
162 if (primary && entry->quality == 0)
163 return seq_printf(seq, "TT %pM, ", entry->dest);
164 else if (batadv_compare_eth(entry->src, src))
165 return seq_printf(seq, "TQ %pM %d, ", entry->dest,
171 static void batadv_vis_data_insert_interfaces(struct hlist_head *list,
172 struct vis_packet *packet,
173 struct vis_info_entry *entries)
177 for (i = 0; i < packet->entries; i++) {
178 if (entries[i].quality == 0)
181 if (batadv_compare_eth(entries[i].src, packet->vis_orig))
184 batadv_vis_data_insert_interface(entries[i].src, list, false);
188 static void batadv_vis_data_read_entries(struct seq_file *seq,
189 struct hlist_head *list,
190 struct vis_packet *packet,
191 struct vis_info_entry *entries)
194 struct if_list_entry *entry;
195 struct hlist_node *pos;
197 hlist_for_each_entry(entry, pos, list, list) {
198 seq_printf(seq, "%pM,", entry->addr);
200 for (i = 0; i < packet->entries; i++)
201 batadv_vis_data_read_entry(seq, &entries[i],
202 entry->addr, entry->primary);
204 /* add primary/secondary records */
205 if (batadv_compare_eth(entry->addr, packet->vis_orig))
206 batadv_vis_data_read_prim_sec(seq, list);
208 seq_printf(seq, "\n");
212 static void batadv_vis_seq_print_text_bucket(struct seq_file *seq,
213 const struct hlist_head *head)
215 struct hlist_node *node;
216 struct vis_info *info;
217 struct vis_packet *packet;
218 uint8_t *entries_pos;
219 struct vis_info_entry *entries;
220 struct if_list_entry *entry;
221 struct hlist_node *pos, *n;
223 HLIST_HEAD(vis_if_list);
225 hlist_for_each_entry_rcu(info, node, head, hash_entry) {
226 packet = (struct vis_packet *)info->skb_packet->data;
227 entries_pos = (uint8_t *)packet + sizeof(*packet);
228 entries = (struct vis_info_entry *)entries_pos;
230 batadv_vis_data_insert_interface(packet->vis_orig, &vis_if_list,
232 batadv_vis_data_insert_interfaces(&vis_if_list, packet,
234 batadv_vis_data_read_entries(seq, &vis_if_list, packet,
237 hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, list) {
238 hlist_del(&entry->list);
244 int batadv_vis_seq_print_text(struct seq_file *seq, void *offset)
246 struct hard_iface *primary_if;
247 struct hlist_head *head;
248 struct net_device *net_dev = (struct net_device *)seq->private;
249 struct bat_priv *bat_priv = netdev_priv(net_dev);
250 struct hashtable_t *hash = bat_priv->vis_hash;
253 int vis_server = atomic_read(&bat_priv->vis_mode);
255 primary_if = batadv_primary_if_get_selected(bat_priv);
259 if (vis_server == VIS_TYPE_CLIENT_UPDATE)
262 spin_lock_bh(&bat_priv->vis_hash_lock);
263 for (i = 0; i < hash->size; i++) {
264 head = &hash->table[i];
265 batadv_vis_seq_print_text_bucket(seq, head);
267 spin_unlock_bh(&bat_priv->vis_hash_lock);
271 batadv_hardif_free_ref(primary_if);
275 /* add the info packet to the send list, if it was not
278 static void batadv_send_list_add(struct bat_priv *bat_priv,
279 struct vis_info *info)
281 if (list_empty(&info->send_list)) {
282 kref_get(&info->refcount);
283 list_add_tail(&info->send_list, &bat_priv->vis_send_list);
287 /* delete the info packet from the send list, if it was
290 static void batadv_send_list_del(struct vis_info *info)
292 if (!list_empty(&info->send_list)) {
293 list_del_init(&info->send_list);
294 kref_put(&info->refcount, batadv_free_info);
298 /* tries to add one entry to the receive list. */
299 static void batadv_recv_list_add(struct bat_priv *bat_priv,
300 struct list_head *recv_list, const char *mac)
302 struct recvlist_node *entry;
304 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
308 memcpy(entry->mac, mac, ETH_ALEN);
309 spin_lock_bh(&bat_priv->vis_list_lock);
310 list_add_tail(&entry->list, recv_list);
311 spin_unlock_bh(&bat_priv->vis_list_lock);
314 /* returns 1 if this mac is in the recv_list */
315 static int batadv_recv_list_is_in(struct bat_priv *bat_priv,
316 const struct list_head *recv_list,
319 const struct recvlist_node *entry;
321 spin_lock_bh(&bat_priv->vis_list_lock);
322 list_for_each_entry(entry, recv_list, list) {
323 if (batadv_compare_eth(entry->mac, mac)) {
324 spin_unlock_bh(&bat_priv->vis_list_lock);
328 spin_unlock_bh(&bat_priv->vis_list_lock);
332 /* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old,
333 * broken.. ). vis hash must be locked outside. is_new is set when the packet
334 * is newer than old entries in the hash.
336 static struct vis_info *batadv_add_packet(struct bat_priv *bat_priv,
337 struct vis_packet *vis_packet,
338 int vis_info_len, int *is_new,
341 struct vis_info *info, *old_info;
342 struct vis_packet *search_packet, *old_packet;
343 struct vis_info search_elem;
344 struct vis_packet *packet;
349 if (!bat_priv->vis_hash)
352 /* see if the packet is already in vis_hash */
353 search_elem.skb_packet = dev_alloc_skb(sizeof(*search_packet));
354 if (!search_elem.skb_packet)
356 search_packet = (struct vis_packet *)skb_put(search_elem.skb_packet,
357 sizeof(*search_packet));
359 memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN);
360 old_info = batadv_vis_hash_find(bat_priv, &search_elem);
361 kfree_skb(search_elem.skb_packet);
364 old_packet = (struct vis_packet *)old_info->skb_packet->data;
365 if (!batadv_seq_after(ntohl(vis_packet->seqno),
366 ntohl(old_packet->seqno))) {
367 if (old_packet->seqno == vis_packet->seqno) {
368 batadv_recv_list_add(bat_priv,
369 &old_info->recv_list,
370 vis_packet->sender_orig);
373 /* newer packet is already in hash. */
377 /* remove old entry */
378 batadv_hash_remove(bat_priv->vis_hash, batadv_vis_info_cmp,
379 batadv_vis_info_choose, old_info);
380 batadv_send_list_del(old_info);
381 kref_put(&old_info->refcount, batadv_free_info);
384 info = kmalloc(sizeof(*info), GFP_ATOMIC);
388 info->skb_packet = dev_alloc_skb(sizeof(*packet) + vis_info_len +
390 if (!info->skb_packet) {
394 skb_reserve(info->skb_packet, ETH_HLEN);
395 packet = (struct vis_packet *)skb_put(info->skb_packet, sizeof(*packet)
398 kref_init(&info->refcount);
399 INIT_LIST_HEAD(&info->send_list);
400 INIT_LIST_HEAD(&info->recv_list);
401 info->first_seen = jiffies;
402 info->bat_priv = bat_priv;
403 memcpy(packet, vis_packet, sizeof(*packet) + vis_info_len);
405 /* initialize and add new packet. */
408 /* Make it a broadcast packet, if required */
410 memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
412 /* repair if entries is longer than packet. */
413 if (packet->entries * sizeof(struct vis_info_entry) > vis_info_len)
414 packet->entries = vis_info_len / sizeof(struct vis_info_entry);
416 batadv_recv_list_add(bat_priv, &info->recv_list, packet->sender_orig);
419 hash_added = batadv_hash_add(bat_priv->vis_hash, batadv_vis_info_cmp,
420 batadv_vis_info_choose, info,
422 if (hash_added != 0) {
423 /* did not work (for some reason) */
424 kref_put(&info->refcount, batadv_free_info);
431 /* handle the server sync packet, forward if needed. */
432 void batadv_receive_server_sync_packet(struct bat_priv *bat_priv,
433 struct vis_packet *vis_packet,
436 struct vis_info *info;
437 int is_new, make_broadcast;
438 int vis_server = atomic_read(&bat_priv->vis_mode);
440 make_broadcast = (vis_server == VIS_TYPE_SERVER_SYNC);
442 spin_lock_bh(&bat_priv->vis_hash_lock);
443 info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
444 &is_new, make_broadcast);
448 /* only if we are server ourselves and packet is newer than the one in
451 if (vis_server == VIS_TYPE_SERVER_SYNC && is_new)
452 batadv_send_list_add(bat_priv, info);
454 spin_unlock_bh(&bat_priv->vis_hash_lock);
457 /* handle an incoming client update packet and schedule forward if needed. */
458 void batadv_receive_client_update_packet(struct bat_priv *bat_priv,
459 struct vis_packet *vis_packet,
462 struct vis_info *info;
463 struct vis_packet *packet;
465 int vis_server = atomic_read(&bat_priv->vis_mode);
468 /* clients shall not broadcast. */
469 if (is_broadcast_ether_addr(vis_packet->target_orig))
472 /* Are we the target for this VIS packet? */
473 if (vis_server == VIS_TYPE_SERVER_SYNC &&
474 batadv_is_my_mac(vis_packet->target_orig))
477 spin_lock_bh(&bat_priv->vis_hash_lock);
478 info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
479 &is_new, are_target);
483 /* note that outdated packets will be dropped at this point. */
485 packet = (struct vis_packet *)info->skb_packet->data;
487 /* send only if we're the target server or ... */
488 if (are_target && is_new) {
489 packet->vis_type = VIS_TYPE_SERVER_SYNC; /* upgrade! */
490 batadv_send_list_add(bat_priv, info);
492 /* ... we're not the recipient (and thus need to forward). */
493 } else if (!batadv_is_my_mac(packet->target_orig)) {
494 batadv_send_list_add(bat_priv, info);
498 spin_unlock_bh(&bat_priv->vis_hash_lock);
501 /* Walk the originators and find the VIS server with the best tq. Set the packet
502 * address to its address and return the best_tq.
504 * Must be called with the originator hash locked
506 static int batadv_find_best_vis_server(struct bat_priv *bat_priv,
507 struct vis_info *info)
509 struct hashtable_t *hash = bat_priv->orig_hash;
510 struct neigh_node *router;
511 struct hlist_node *node;
512 struct hlist_head *head;
513 struct orig_node *orig_node;
514 struct vis_packet *packet;
518 packet = (struct vis_packet *)info->skb_packet->data;
520 for (i = 0; i < hash->size; i++) {
521 head = &hash->table[i];
524 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
525 router = batadv_orig_node_get_router(orig_node);
529 if ((orig_node->flags & VIS_SERVER) &&
530 (router->tq_avg > best_tq)) {
531 best_tq = router->tq_avg;
532 memcpy(packet->target_orig, orig_node->orig,
535 batadv_neigh_node_free_ref(router);
543 /* Return true if the vis packet is full. */
544 static bool batadv_vis_packet_full(const struct vis_info *info)
546 const struct vis_packet *packet;
549 packet = (struct vis_packet *)info->skb_packet->data;
550 num_items = BATADV_MAX_VIS_PACKET_SIZE / sizeof(struct vis_info_entry);
552 if (num_items < packet->entries + 1)
557 /* generates a packet of own vis data,
558 * returns 0 on success, -1 if no packet could be generated
560 static int batadv_generate_vis_packet(struct bat_priv *bat_priv)
562 struct hashtable_t *hash = bat_priv->orig_hash;
563 struct hlist_node *node;
564 struct hlist_head *head;
565 struct orig_node *orig_node;
566 struct neigh_node *router;
567 struct vis_info *info = bat_priv->my_vis_info;
568 struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data;
569 struct vis_info_entry *entry;
570 struct tt_common_entry *tt_common_entry;
574 info->first_seen = jiffies;
575 packet->vis_type = atomic_read(&bat_priv->vis_mode);
577 memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
578 packet->header.ttl = BATADV_TTL;
579 packet->seqno = htonl(ntohl(packet->seqno) + 1);
581 skb_trim(info->skb_packet, sizeof(*packet));
583 if (packet->vis_type == VIS_TYPE_CLIENT_UPDATE) {
584 best_tq = batadv_find_best_vis_server(bat_priv, info);
590 for (i = 0; i < hash->size; i++) {
591 head = &hash->table[i];
594 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
595 router = batadv_orig_node_get_router(orig_node);
599 if (!batadv_compare_eth(router->addr, orig_node->orig))
602 if (router->if_incoming->if_status != IF_ACTIVE)
605 if (router->tq_avg < 1)
608 /* fill one entry into buffer. */
609 entry = (struct vis_info_entry *)
610 skb_put(info->skb_packet, sizeof(*entry));
612 router->if_incoming->net_dev->dev_addr,
614 memcpy(entry->dest, orig_node->orig, ETH_ALEN);
615 entry->quality = router->tq_avg;
619 batadv_neigh_node_free_ref(router);
621 if (batadv_vis_packet_full(info))
627 hash = bat_priv->tt_local_hash;
629 for (i = 0; i < hash->size; i++) {
630 head = &hash->table[i];
633 hlist_for_each_entry_rcu(tt_common_entry, node, head,
635 entry = (struct vis_info_entry *)
636 skb_put(info->skb_packet,
638 memset(entry->src, 0, ETH_ALEN);
639 memcpy(entry->dest, tt_common_entry->addr, ETH_ALEN);
640 entry->quality = 0; /* 0 means TT */
643 if (batadv_vis_packet_full(info))
656 /* free old vis packets. Must be called with this vis_hash_lock
659 static void batadv_purge_vis_packets(struct bat_priv *bat_priv)
662 struct hashtable_t *hash = bat_priv->vis_hash;
663 struct hlist_node *node, *node_tmp;
664 struct hlist_head *head;
665 struct vis_info *info;
667 for (i = 0; i < hash->size; i++) {
668 head = &hash->table[i];
670 hlist_for_each_entry_safe(info, node, node_tmp,
672 /* never purge own data. */
673 if (info == bat_priv->my_vis_info)
676 if (batadv_has_timed_out(info->first_seen,
677 BATADV_VIS_TIMEOUT)) {
679 batadv_send_list_del(info);
680 kref_put(&info->refcount, batadv_free_info);
686 static void batadv_broadcast_vis_packet(struct bat_priv *bat_priv,
687 struct vis_info *info)
689 struct neigh_node *router;
690 struct hashtable_t *hash = bat_priv->orig_hash;
691 struct hlist_node *node;
692 struct hlist_head *head;
693 struct orig_node *orig_node;
694 struct vis_packet *packet;
696 struct hard_iface *hard_iface;
697 uint8_t dstaddr[ETH_ALEN];
701 packet = (struct vis_packet *)info->skb_packet->data;
703 /* send to all routers in range. */
704 for (i = 0; i < hash->size; i++) {
705 head = &hash->table[i];
708 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
709 /* if it's a vis server and reachable, send it. */
710 if (!(orig_node->flags & VIS_SERVER))
713 router = batadv_orig_node_get_router(orig_node);
717 /* don't send it if we already received the packet from
720 if (batadv_recv_list_is_in(bat_priv, &info->recv_list,
722 batadv_neigh_node_free_ref(router);
726 memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
727 hard_iface = router->if_incoming;
728 memcpy(dstaddr, router->addr, ETH_ALEN);
730 batadv_neigh_node_free_ref(router);
732 skb = skb_clone(info->skb_packet, GFP_ATOMIC);
734 batadv_send_skb_packet(skb, hard_iface,
742 static void batadv_unicast_vis_packet(struct bat_priv *bat_priv,
743 struct vis_info *info)
745 struct orig_node *orig_node;
746 struct neigh_node *router = NULL;
748 struct vis_packet *packet;
750 packet = (struct vis_packet *)info->skb_packet->data;
752 orig_node = batadv_orig_hash_find(bat_priv, packet->target_orig);
756 router = batadv_orig_node_get_router(orig_node);
760 skb = skb_clone(info->skb_packet, GFP_ATOMIC);
762 batadv_send_skb_packet(skb, router->if_incoming, router->addr);
766 batadv_neigh_node_free_ref(router);
768 batadv_orig_node_free_ref(orig_node);
771 /* only send one vis packet. called from batadv_send_vis_packets() */
772 static void batadv_send_vis_packet(struct bat_priv *bat_priv,
773 struct vis_info *info)
775 struct hard_iface *primary_if;
776 struct vis_packet *packet;
778 primary_if = batadv_primary_if_get_selected(bat_priv);
782 packet = (struct vis_packet *)info->skb_packet->data;
783 if (packet->header.ttl < 2) {
784 pr_debug("Error - can't send vis packet: ttl exceeded\n");
788 memcpy(packet->sender_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
789 packet->header.ttl--;
791 if (is_broadcast_ether_addr(packet->target_orig))
792 batadv_broadcast_vis_packet(bat_priv, info);
794 batadv_unicast_vis_packet(bat_priv, info);
795 packet->header.ttl++; /* restore TTL */
799 batadv_hardif_free_ref(primary_if);
802 /* called from timer; send (and maybe generate) vis packet. */
803 static void batadv_send_vis_packets(struct work_struct *work)
805 struct delayed_work *delayed_work =
806 container_of(work, struct delayed_work, work);
807 struct bat_priv *bat_priv =
808 container_of(delayed_work, struct bat_priv, vis_work);
809 struct vis_info *info;
811 spin_lock_bh(&bat_priv->vis_hash_lock);
812 batadv_purge_vis_packets(bat_priv);
814 if (batadv_generate_vis_packet(bat_priv) == 0) {
815 /* schedule if generation was successful */
816 batadv_send_list_add(bat_priv, bat_priv->my_vis_info);
819 while (!list_empty(&bat_priv->vis_send_list)) {
820 info = list_first_entry(&bat_priv->vis_send_list,
821 typeof(*info), send_list);
823 kref_get(&info->refcount);
824 spin_unlock_bh(&bat_priv->vis_hash_lock);
826 batadv_send_vis_packet(bat_priv, info);
828 spin_lock_bh(&bat_priv->vis_hash_lock);
829 batadv_send_list_del(info);
830 kref_put(&info->refcount, batadv_free_info);
832 spin_unlock_bh(&bat_priv->vis_hash_lock);
833 batadv_start_vis_timer(bat_priv);
836 /* init the vis server. this may only be called when if_list is already
837 * initialized (e.g. bat0 is initialized, interfaces have been added)
839 int batadv_vis_init(struct bat_priv *bat_priv)
841 struct vis_packet *packet;
844 unsigned long first_seen;
846 if (bat_priv->vis_hash)
849 spin_lock_bh(&bat_priv->vis_hash_lock);
851 bat_priv->vis_hash = batadv_hash_new(256);
852 if (!bat_priv->vis_hash) {
853 pr_err("Can't initialize vis_hash\n");
857 bat_priv->my_vis_info = kmalloc(BATADV_MAX_VIS_PACKET_SIZE, GFP_ATOMIC);
858 if (!bat_priv->my_vis_info)
861 len = sizeof(*packet) + BATADV_MAX_VIS_PACKET_SIZE + ETH_HLEN;
862 bat_priv->my_vis_info->skb_packet = dev_alloc_skb(len);
863 if (!bat_priv->my_vis_info->skb_packet)
866 skb_reserve(bat_priv->my_vis_info->skb_packet, ETH_HLEN);
867 packet = (struct vis_packet *)skb_put(bat_priv->my_vis_info->skb_packet,
870 /* prefill the vis info */
871 first_seen = jiffies - msecs_to_jiffies(BATADV_VIS_INTERVAL);
872 bat_priv->my_vis_info->first_seen = first_seen;
873 INIT_LIST_HEAD(&bat_priv->my_vis_info->recv_list);
874 INIT_LIST_HEAD(&bat_priv->my_vis_info->send_list);
875 kref_init(&bat_priv->my_vis_info->refcount);
876 bat_priv->my_vis_info->bat_priv = bat_priv;
877 packet->header.version = BATADV_COMPAT_VERSION;
878 packet->header.packet_type = BAT_VIS;
879 packet->header.ttl = BATADV_TTL;
883 INIT_LIST_HEAD(&bat_priv->vis_send_list);
885 hash_added = batadv_hash_add(bat_priv->vis_hash, batadv_vis_info_cmp,
886 batadv_vis_info_choose,
887 bat_priv->my_vis_info,
888 &bat_priv->my_vis_info->hash_entry);
889 if (hash_added != 0) {
890 pr_err("Can't add own vis packet into hash\n");
891 /* not in hash, need to remove it manually. */
892 kref_put(&bat_priv->my_vis_info->refcount, batadv_free_info);
896 spin_unlock_bh(&bat_priv->vis_hash_lock);
897 batadv_start_vis_timer(bat_priv);
901 kfree(bat_priv->my_vis_info);
902 bat_priv->my_vis_info = NULL;
904 spin_unlock_bh(&bat_priv->vis_hash_lock);
905 batadv_vis_quit(bat_priv);
909 /* Decrease the reference count on a hash item info */
910 static void batadv_free_info_ref(struct hlist_node *node, void *arg)
912 struct vis_info *info;
914 info = container_of(node, struct vis_info, hash_entry);
915 batadv_send_list_del(info);
916 kref_put(&info->refcount, batadv_free_info);
919 /* shutdown vis-server */
920 void batadv_vis_quit(struct bat_priv *bat_priv)
922 if (!bat_priv->vis_hash)
925 cancel_delayed_work_sync(&bat_priv->vis_work);
927 spin_lock_bh(&bat_priv->vis_hash_lock);
928 /* properly remove, kill timers ... */
929 batadv_hash_delete(bat_priv->vis_hash, batadv_free_info_ref, NULL);
930 bat_priv->vis_hash = NULL;
931 bat_priv->my_vis_info = NULL;
932 spin_unlock_bh(&bat_priv->vis_hash_lock);
935 /* schedule packets for (re)transmission */
936 static void batadv_start_vis_timer(struct bat_priv *bat_priv)
938 INIT_DELAYED_WORK(&bat_priv->vis_work, batadv_send_vis_packets);
939 queue_delayed_work(batadv_event_workqueue, &bat_priv->vis_work,
940 msecs_to_jiffies(BATADV_VIS_INTERVAL));