1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
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, see <http://www.gnu.org/licenses/>.
18 #include <linux/crc32c.h>
19 #include <linux/highmem.h>
20 #include <linux/if_vlan.h>
23 #include <net/dsfield.h>
29 #include "originator.h"
30 #include "soft-interface.h"
31 #include "icmp_socket.h"
32 #include "translation-table.h"
33 #include "hard-interface.h"
34 #include "gateway_client.h"
35 #include "bridge_loop_avoidance.h"
36 #include "distributed-arp-table.h"
37 #include "gateway_common.h"
40 #include "network-coding.h"
41 #include "fragmentation.h"
44 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
45 * list traversals just rcu-locked
47 struct list_head batadv_hardif_list;
48 static int (*batadv_rx_handler[256])(struct sk_buff *,
49 struct batadv_hard_iface *);
50 char batadv_routing_algo[20] = "BATMAN_IV";
51 static struct hlist_head batadv_algo_list;
53 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
55 struct workqueue_struct *batadv_event_workqueue;
57 static void batadv_recv_handler_init(void);
59 static int __init batadv_init(void)
61 INIT_LIST_HEAD(&batadv_hardif_list);
62 INIT_HLIST_HEAD(&batadv_algo_list);
64 batadv_recv_handler_init();
69 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
71 if (!batadv_event_workqueue)
75 batadv_debugfs_init();
77 register_netdevice_notifier(&batadv_hard_if_notifier);
78 rtnl_link_register(&batadv_link_ops);
80 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
81 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
86 static void __exit batadv_exit(void)
88 batadv_debugfs_destroy();
89 rtnl_link_unregister(&batadv_link_ops);
90 unregister_netdevice_notifier(&batadv_hard_if_notifier);
91 batadv_hardif_remove_interfaces();
93 flush_workqueue(batadv_event_workqueue);
94 destroy_workqueue(batadv_event_workqueue);
95 batadv_event_workqueue = NULL;
100 int batadv_mesh_init(struct net_device *soft_iface)
102 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
105 spin_lock_init(&bat_priv->forw_bat_list_lock);
106 spin_lock_init(&bat_priv->forw_bcast_list_lock);
107 spin_lock_init(&bat_priv->tt.changes_list_lock);
108 spin_lock_init(&bat_priv->tt.req_list_lock);
109 spin_lock_init(&bat_priv->tt.roam_list_lock);
110 spin_lock_init(&bat_priv->tt.last_changeset_lock);
111 spin_lock_init(&bat_priv->tt.commit_lock);
112 spin_lock_init(&bat_priv->gw.list_lock);
113 spin_lock_init(&bat_priv->tvlv.container_list_lock);
114 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
115 spin_lock_init(&bat_priv->softif_vlan_list_lock);
117 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
118 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
119 INIT_HLIST_HEAD(&bat_priv->gw.list);
120 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
121 INIT_LIST_HEAD(&bat_priv->tt.req_list);
122 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
123 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
124 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
125 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
127 ret = batadv_originator_init(bat_priv);
131 ret = batadv_tt_init(bat_priv);
135 ret = batadv_bla_init(bat_priv);
139 ret = batadv_dat_init(bat_priv);
143 ret = batadv_nc_mesh_init(bat_priv);
147 batadv_gw_init(bat_priv);
149 atomic_set(&bat_priv->gw.reselect, 0);
150 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
155 batadv_mesh_free(soft_iface);
159 void batadv_mesh_free(struct net_device *soft_iface)
161 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
163 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
165 batadv_purge_outstanding_packets(bat_priv, NULL);
167 batadv_gw_node_purge(bat_priv);
168 batadv_nc_mesh_free(bat_priv);
169 batadv_dat_free(bat_priv);
170 batadv_bla_free(bat_priv);
172 /* Free the TT and the originator tables only after having terminated
173 * all the other depending components which may use these structures for
176 batadv_tt_free(bat_priv);
178 /* Since the originator table clean up routine is accessing the TT
179 * tables as well, it has to be invoked after the TT tables have been
180 * freed and marked as empty. This ensures that no cleanup RCU callbacks
181 * accessing the TT data are scheduled for later execution.
183 batadv_originator_free(bat_priv);
185 batadv_gw_free(bat_priv);
187 free_percpu(bat_priv->bat_counters);
188 bat_priv->bat_counters = NULL;
190 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
194 * batadv_is_my_mac - check if the given mac address belongs to any of the real
195 * interfaces in the current mesh
196 * @bat_priv: the bat priv with all the soft interface information
197 * @addr: the address to check
199 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr)
201 const struct batadv_hard_iface *hard_iface;
204 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
205 if (hard_iface->if_status != BATADV_IF_ACTIVE)
208 if (hard_iface->soft_iface != bat_priv->soft_iface)
211 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
221 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
222 * function that requires the primary interface
223 * @seq: debugfs table seq_file struct
225 * Returns primary interface if found or NULL otherwise.
227 struct batadv_hard_iface *
228 batadv_seq_print_text_primary_if_get(struct seq_file *seq)
230 struct net_device *net_dev = (struct net_device *)seq->private;
231 struct batadv_priv *bat_priv = netdev_priv(net_dev);
232 struct batadv_hard_iface *primary_if;
234 primary_if = batadv_primary_if_get_selected(bat_priv);
238 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
243 if (primary_if->if_status == BATADV_IF_ACTIVE)
247 "BATMAN mesh %s disabled - primary interface not active\n",
249 batadv_hardif_free_ref(primary_if);
257 * batadv_max_header_len - calculate maximum encapsulation overhead for a
260 * Return the maximum encapsulation overhead in bytes.
262 int batadv_max_header_len(void)
266 header_len = max_t(int, header_len,
267 sizeof(struct batadv_unicast_packet));
268 header_len = max_t(int, header_len,
269 sizeof(struct batadv_unicast_4addr_packet));
270 header_len = max_t(int, header_len,
271 sizeof(struct batadv_bcast_packet));
273 #ifdef CONFIG_BATMAN_ADV_NC
274 header_len = max_t(int, header_len,
275 sizeof(struct batadv_coded_packet));
282 * batadv_skb_set_priority - sets skb priority according to packet content
283 * @skb: the packet to be sent
284 * @offset: offset to the packet content
286 * This function sets a value between 256 and 263 (802.1d priority), which
287 * can be interpreted by the cfg80211 or other drivers.
289 void batadv_skb_set_priority(struct sk_buff *skb, int offset)
291 struct iphdr ip_hdr_tmp, *ip_hdr;
292 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
293 struct ethhdr ethhdr_tmp, *ethhdr;
294 struct vlan_ethhdr *vhdr, vhdr_tmp;
297 /* already set, do nothing */
298 if (skb->priority >= 256 && skb->priority <= 263)
301 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp);
305 switch (ethhdr->h_proto) {
306 case htons(ETH_P_8021Q):
307 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
308 sizeof(*vhdr), &vhdr_tmp);
311 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
312 prio = prio >> VLAN_PRIO_SHIFT;
314 case htons(ETH_P_IP):
315 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
316 sizeof(*ip_hdr), &ip_hdr_tmp);
319 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
321 case htons(ETH_P_IPV6):
322 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
323 sizeof(*ip6_hdr), &ip6_hdr_tmp);
326 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
332 skb->priority = prio + 256;
335 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
336 struct batadv_hard_iface *recv_if)
341 /* incoming packets with the batman ethertype received on any active hard
344 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
345 struct packet_type *ptype,
346 struct net_device *orig_dev)
348 struct batadv_priv *bat_priv;
349 struct batadv_ogm_packet *batadv_ogm_packet;
350 struct batadv_hard_iface *hard_iface;
354 hard_iface = container_of(ptype, struct batadv_hard_iface,
356 skb = skb_share_check(skb, GFP_ATOMIC);
358 /* skb was released by skb_share_check() */
362 /* packet should hold at least type and version */
363 if (unlikely(!pskb_may_pull(skb, 2)))
366 /* expect a valid ethernet header here. */
367 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
370 if (!hard_iface->soft_iface)
373 bat_priv = netdev_priv(hard_iface->soft_iface);
375 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
378 /* discard frames on not active interfaces */
379 if (hard_iface->if_status != BATADV_IF_ACTIVE)
382 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
384 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
385 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
386 "Drop packet: incompatible batman version (%i)\n",
387 batadv_ogm_packet->version);
391 /* all receive handlers return whether they received or reused
392 * the supplied skb. if not, we have to free the skb.
394 idx = batadv_ogm_packet->packet_type;
395 ret = (*batadv_rx_handler[idx])(skb, hard_iface);
397 if (ret == NET_RX_DROP)
400 /* return NET_RX_SUCCESS in any case as we
401 * most probably dropped the packet for
402 * routing-logical reasons.
404 return NET_RX_SUCCESS;
412 static void batadv_recv_handler_init(void)
416 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
417 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
419 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
420 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
422 /* compile time checks for struct member offsets */
423 BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
424 BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
425 BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
426 BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
427 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
428 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
430 /* broadcast packet */
431 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
433 /* unicast packets ... */
434 /* unicast with 4 addresses packet */
435 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
437 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
438 /* unicast tvlv packet */
439 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
440 /* batman icmp packet */
441 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
442 /* Fragmented packets */
443 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
447 batadv_recv_handler_register(uint8_t packet_type,
448 int (*recv_handler)(struct sk_buff *,
449 struct batadv_hard_iface *))
451 int (*curr)(struct sk_buff *,
452 struct batadv_hard_iface *);
453 curr = batadv_rx_handler[packet_type];
455 if ((curr != batadv_recv_unhandled_packet) &&
456 (curr != batadv_recv_unhandled_unicast_packet))
459 batadv_rx_handler[packet_type] = recv_handler;
463 void batadv_recv_handler_unregister(uint8_t packet_type)
465 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
468 static struct batadv_algo_ops *batadv_algo_get(char *name)
470 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
472 hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
473 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
476 bat_algo_ops = bat_algo_ops_tmp;
483 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
485 struct batadv_algo_ops *bat_algo_ops_tmp;
488 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
489 if (bat_algo_ops_tmp) {
490 pr_info("Trying to register already registered routing algorithm: %s\n",
496 /* all algorithms must implement all ops (for now) */
497 if (!bat_algo_ops->bat_iface_enable ||
498 !bat_algo_ops->bat_iface_disable ||
499 !bat_algo_ops->bat_iface_update_mac ||
500 !bat_algo_ops->bat_primary_iface_set ||
501 !bat_algo_ops->bat_ogm_schedule ||
502 !bat_algo_ops->bat_ogm_emit ||
503 !bat_algo_ops->bat_neigh_cmp ||
504 !bat_algo_ops->bat_neigh_is_equiv_or_better) {
505 pr_info("Routing algo '%s' does not implement required ops\n",
511 INIT_HLIST_NODE(&bat_algo_ops->list);
512 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
519 int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
521 struct batadv_algo_ops *bat_algo_ops;
524 bat_algo_ops = batadv_algo_get(name);
528 bat_priv->bat_algo_ops = bat_algo_ops;
535 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
537 struct batadv_algo_ops *bat_algo_ops;
539 seq_puts(seq, "Available routing algorithms:\n");
541 hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
542 seq_printf(seq, "%s\n", bat_algo_ops->name);
549 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
551 * @skb: skb pointing to fragmented socket buffers
552 * @payload_ptr: Pointer to position inside the head buffer of the skb
553 * marking the start of the data to be CRC'ed
555 * payload_ptr must always point to an address in the skb head buffer and not to
558 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
562 unsigned int to = skb->len;
563 struct skb_seq_state st;
566 unsigned int consumed = 0;
568 from = (unsigned int)(payload_ptr - skb->data);
570 skb_prepare_seq_read(skb, from, to, &st);
571 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
572 crc = crc32c(crc, data, len);
580 * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
582 * @tvlv_handler: the tvlv handler to free
585 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler)
587 if (atomic_dec_and_test(&tvlv_handler->refcount))
588 kfree_rcu(tvlv_handler, rcu);
592 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
593 * based on the provided type and version (both need to match)
594 * @bat_priv: the bat priv with all the soft interface information
595 * @type: tvlv handler type to look for
596 * @version: tvlv handler version to look for
598 * Returns tvlv handler if found or NULL otherwise.
600 static struct batadv_tvlv_handler
601 *batadv_tvlv_handler_get(struct batadv_priv *bat_priv,
602 uint8_t type, uint8_t version)
604 struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
607 hlist_for_each_entry_rcu(tvlv_handler_tmp,
608 &bat_priv->tvlv.handler_list, list) {
609 if (tvlv_handler_tmp->type != type)
612 if (tvlv_handler_tmp->version != version)
615 if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount))
618 tvlv_handler = tvlv_handler_tmp;
627 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
629 * @tvlv_handler: the tvlv container to free
631 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv)
633 if (atomic_dec_and_test(&tvlv->refcount))
638 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
639 * list based on the provided type and version (both need to match)
640 * @bat_priv: the bat priv with all the soft interface information
641 * @type: tvlv container type to look for
642 * @version: tvlv container version to look for
644 * Has to be called with the appropriate locks being acquired
645 * (tvlv.container_list_lock).
647 * Returns tvlv container if found or NULL otherwise.
649 static struct batadv_tvlv_container
650 *batadv_tvlv_container_get(struct batadv_priv *bat_priv,
651 uint8_t type, uint8_t version)
653 struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
655 hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
656 if (tvlv_tmp->tvlv_hdr.type != type)
659 if (tvlv_tmp->tvlv_hdr.version != version)
662 if (!atomic_inc_not_zero(&tvlv_tmp->refcount))
673 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
675 * @bat_priv: the bat priv with all the soft interface information
677 * Has to be called with the appropriate locks being acquired
678 * (tvlv.container_list_lock).
680 * Returns size of all currently registered tvlv containers in bytes.
682 static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
684 struct batadv_tvlv_container *tvlv;
685 uint16_t tvlv_len = 0;
687 hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
688 tvlv_len += sizeof(struct batadv_tvlv_hdr);
689 tvlv_len += ntohs(tvlv->tvlv_hdr.len);
696 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
698 * @tvlv: the to be removed tvlv container
700 * Has to be called with the appropriate locks being acquired
701 * (tvlv.container_list_lock).
703 static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv)
708 hlist_del(&tvlv->list);
710 /* first call to decrement the counter, second call to free */
711 batadv_tvlv_container_free_ref(tvlv);
712 batadv_tvlv_container_free_ref(tvlv);
716 * batadv_tvlv_container_unregister - unregister tvlv container based on the
717 * provided type and version (both need to match)
718 * @bat_priv: the bat priv with all the soft interface information
719 * @type: tvlv container type to unregister
720 * @version: tvlv container type to unregister
722 void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
723 uint8_t type, uint8_t version)
725 struct batadv_tvlv_container *tvlv;
727 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
728 tvlv = batadv_tvlv_container_get(bat_priv, type, version);
729 batadv_tvlv_container_remove(tvlv);
730 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
734 * batadv_tvlv_container_register - register tvlv type, version and content
735 * to be propagated with each (primary interface) OGM
736 * @bat_priv: the bat priv with all the soft interface information
737 * @type: tvlv container type
738 * @version: tvlv container version
739 * @tvlv_value: tvlv container content
740 * @tvlv_value_len: tvlv container content length
742 * If a container of the same type and version was already registered the new
743 * content is going to replace the old one.
745 void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
746 uint8_t type, uint8_t version,
747 void *tvlv_value, uint16_t tvlv_value_len)
749 struct batadv_tvlv_container *tvlv_old, *tvlv_new;
754 tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
758 tvlv_new->tvlv_hdr.version = version;
759 tvlv_new->tvlv_hdr.type = type;
760 tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
762 memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
763 INIT_HLIST_NODE(&tvlv_new->list);
764 atomic_set(&tvlv_new->refcount, 1);
766 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
767 tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
768 batadv_tvlv_container_remove(tvlv_old);
769 hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
770 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
774 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate
775 * requested packet size
776 * @packet_buff: packet buffer
777 * @packet_buff_len: packet buffer size
778 * @packet_min_len: requested packet minimum size
779 * @additional_packet_len: requested additional packet size on top of minimum
782 * Returns true of the packet buffer could be changed to the requested size,
785 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
786 int *packet_buff_len,
788 int additional_packet_len)
790 unsigned char *new_buff;
792 new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
794 /* keep old buffer if kmalloc should fail */
796 memcpy(new_buff, *packet_buff, min_packet_len);
798 *packet_buff = new_buff;
799 *packet_buff_len = min_packet_len + additional_packet_len;
807 * batadv_tvlv_container_ogm_append - append tvlv container content to given
809 * @bat_priv: the bat priv with all the soft interface information
810 * @packet_buff: ogm packet buffer
811 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
813 * @packet_min_len: ogm header size to be preserved for the OGM itself
815 * The ogm packet might be enlarged or shrunk depending on the current size
816 * and the size of the to-be-appended tvlv containers.
818 * Returns size of all appended tvlv containers in bytes.
820 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
821 unsigned char **packet_buff,
822 int *packet_buff_len,
825 struct batadv_tvlv_container *tvlv;
826 struct batadv_tvlv_hdr *tvlv_hdr;
827 uint16_t tvlv_value_len;
831 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
832 tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
834 ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
835 packet_min_len, tvlv_value_len);
843 tvlv_value = (*packet_buff) + packet_min_len;
845 hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
846 tvlv_hdr = tvlv_value;
847 tvlv_hdr->type = tvlv->tvlv_hdr.type;
848 tvlv_hdr->version = tvlv->tvlv_hdr.version;
849 tvlv_hdr->len = tvlv->tvlv_hdr.len;
850 tvlv_value = tvlv_hdr + 1;
851 memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
852 tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
856 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
857 return tvlv_value_len;
861 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
862 * appropriate handlers
863 * @bat_priv: the bat priv with all the soft interface information
864 * @tvlv_handler: tvlv callback function handling the tvlv content
865 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
866 * @orig_node: orig node emitting the ogm packet
867 * @src: source mac address of the unicast packet
868 * @dst: destination mac address of the unicast packet
869 * @tvlv_value: tvlv content
870 * @tvlv_value_len: tvlv content length
872 * Returns success if handler was not found or the return value of the handler
875 static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
876 struct batadv_tvlv_handler *tvlv_handler,
878 struct batadv_orig_node *orig_node,
879 uint8_t *src, uint8_t *dst,
880 void *tvlv_value, uint16_t tvlv_value_len)
883 return NET_RX_SUCCESS;
886 if (!tvlv_handler->ogm_handler)
887 return NET_RX_SUCCESS;
890 return NET_RX_SUCCESS;
892 tvlv_handler->ogm_handler(bat_priv, orig_node,
894 tvlv_value, tvlv_value_len);
895 tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
898 return NET_RX_SUCCESS;
901 return NET_RX_SUCCESS;
903 if (!tvlv_handler->unicast_handler)
904 return NET_RX_SUCCESS;
906 return tvlv_handler->unicast_handler(bat_priv, src,
911 return NET_RX_SUCCESS;
915 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
916 * appropriate handlers
917 * @bat_priv: the bat priv with all the soft interface information
918 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
919 * @orig_node: orig node emitting the ogm packet
920 * @src: source mac address of the unicast packet
921 * @dst: destination mac address of the unicast packet
922 * @tvlv_value: tvlv content
923 * @tvlv_value_len: tvlv content length
925 * Returns success when processing an OGM or the return value of all called
928 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
930 struct batadv_orig_node *orig_node,
931 uint8_t *src, uint8_t *dst,
932 void *tvlv_value, uint16_t tvlv_value_len)
934 struct batadv_tvlv_handler *tvlv_handler;
935 struct batadv_tvlv_hdr *tvlv_hdr;
936 uint16_t tvlv_value_cont_len;
937 uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
938 int ret = NET_RX_SUCCESS;
940 while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
941 tvlv_hdr = tvlv_value;
942 tvlv_value_cont_len = ntohs(tvlv_hdr->len);
943 tvlv_value = tvlv_hdr + 1;
944 tvlv_value_len -= sizeof(*tvlv_hdr);
946 if (tvlv_value_cont_len > tvlv_value_len)
949 tvlv_handler = batadv_tvlv_handler_get(bat_priv,
953 ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
954 ogm_source, orig_node,
955 src, dst, tvlv_value,
956 tvlv_value_cont_len);
958 batadv_tvlv_handler_free_ref(tvlv_handler);
959 tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len;
960 tvlv_value_len -= tvlv_value_cont_len;
967 hlist_for_each_entry_rcu(tvlv_handler,
968 &bat_priv->tvlv.handler_list, list) {
969 if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
970 !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
971 tvlv_handler->ogm_handler(bat_priv, orig_node,
972 cifnotfound, NULL, 0);
974 tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
978 return NET_RX_SUCCESS;
982 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
984 * @bat_priv: the bat priv with all the soft interface information
985 * @batadv_ogm_packet: ogm packet containing the tvlv containers
986 * @orig_node: orig node emitting the ogm packet
988 void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
989 struct batadv_ogm_packet *batadv_ogm_packet,
990 struct batadv_orig_node *orig_node)
993 uint16_t tvlv_value_len;
995 if (!batadv_ogm_packet)
998 tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
1002 tvlv_value = batadv_ogm_packet + 1;
1004 batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
1005 tvlv_value, tvlv_value_len);
1009 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1010 * type and version (both need to match) for ogm tvlv payload and/or unicast
1012 * @bat_priv: the bat priv with all the soft interface information
1013 * @optr: ogm tvlv handler callback function. This function receives the orig
1014 * node, flags and the tvlv content as argument to process.
1015 * @uptr: unicast tvlv handler callback function. This function receives the
1016 * source & destination of the unicast packet as well as the tvlv content
1018 * @type: tvlv handler type to be registered
1019 * @version: tvlv handler version to be registered
1020 * @flags: flags to enable or disable TVLV API behavior
1022 void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
1023 void (*optr)(struct batadv_priv *bat_priv,
1024 struct batadv_orig_node *orig,
1027 uint16_t tvlv_value_len),
1028 int (*uptr)(struct batadv_priv *bat_priv,
1029 uint8_t *src, uint8_t *dst,
1031 uint16_t tvlv_value_len),
1032 uint8_t type, uint8_t version, uint8_t flags)
1034 struct batadv_tvlv_handler *tvlv_handler;
1036 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
1038 batadv_tvlv_handler_free_ref(tvlv_handler);
1042 tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
1046 tvlv_handler->ogm_handler = optr;
1047 tvlv_handler->unicast_handler = uptr;
1048 tvlv_handler->type = type;
1049 tvlv_handler->version = version;
1050 tvlv_handler->flags = flags;
1051 atomic_set(&tvlv_handler->refcount, 1);
1052 INIT_HLIST_NODE(&tvlv_handler->list);
1054 spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
1055 hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
1056 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
1060 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1061 * provided type and version (both need to match)
1062 * @bat_priv: the bat priv with all the soft interface information
1063 * @type: tvlv handler type to be unregistered
1064 * @version: tvlv handler version to be unregistered
1066 void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
1067 uint8_t type, uint8_t version)
1069 struct batadv_tvlv_handler *tvlv_handler;
1071 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
1075 batadv_tvlv_handler_free_ref(tvlv_handler);
1076 spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
1077 hlist_del_rcu(&tvlv_handler->list);
1078 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
1079 batadv_tvlv_handler_free_ref(tvlv_handler);
1083 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1085 * @bat_priv: the bat priv with all the soft interface information
1086 * @src: source mac address of the unicast packet
1087 * @dst: destination mac address of the unicast packet
1089 * @version: tvlv version
1090 * @tvlv_value: tvlv content
1091 * @tvlv_value_len: tvlv content length
1093 void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src,
1094 uint8_t *dst, uint8_t type, uint8_t version,
1095 void *tvlv_value, uint16_t tvlv_value_len)
1097 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
1098 struct batadv_tvlv_hdr *tvlv_hdr;
1099 struct batadv_orig_node *orig_node;
1100 struct sk_buff *skb = NULL;
1101 unsigned char *tvlv_buff;
1102 unsigned int tvlv_len;
1103 ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
1106 orig_node = batadv_orig_hash_find(bat_priv, dst);
1110 tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
1112 skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
1116 skb->priority = TC_PRIO_CONTROL;
1117 skb_reserve(skb, ETH_HLEN);
1118 tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
1119 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
1120 unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
1121 unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
1122 unicast_tvlv_packet->ttl = BATADV_TTL;
1123 unicast_tvlv_packet->reserved = 0;
1124 unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
1125 unicast_tvlv_packet->align = 0;
1126 memcpy(unicast_tvlv_packet->src, src, ETH_ALEN);
1127 memcpy(unicast_tvlv_packet->dst, dst, ETH_ALEN);
1129 tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
1130 tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
1131 tvlv_hdr->version = version;
1132 tvlv_hdr->type = type;
1133 tvlv_hdr->len = htons(tvlv_value_len);
1134 tvlv_buff += sizeof(*tvlv_hdr);
1135 memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
1137 if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
1144 batadv_orig_node_free_ref(orig_node);
1148 * batadv_get_vid - extract the VLAN identifier from skb if any
1149 * @skb: the buffer containing the packet
1150 * @header_len: length of the batman header preceding the ethernet header
1152 * If the packet embedded in the skb is vlan tagged this function returns the
1153 * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
1155 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
1157 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
1158 struct vlan_ethhdr *vhdr;
1161 if (ethhdr->h_proto != htons(ETH_P_8021Q))
1162 return BATADV_NO_FLAGS;
1164 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
1165 return BATADV_NO_FLAGS;
1167 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
1168 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
1169 vid |= BATADV_VLAN_HAS_TAG;
1174 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
1176 struct batadv_algo_ops *bat_algo_ops;
1177 char *algo_name = (char *)val;
1178 size_t name_len = strlen(algo_name);
1180 if (name_len > 0 && algo_name[name_len - 1] == '\n')
1181 algo_name[name_len - 1] = '\0';
1183 bat_algo_ops = batadv_algo_get(algo_name);
1184 if (!bat_algo_ops) {
1185 pr_err("Routing algorithm '%s' is not supported\n", algo_name);
1189 return param_set_copystring(algo_name, kp);
1192 static const struct kernel_param_ops batadv_param_ops_ra = {
1193 .set = batadv_param_set_ra,
1194 .get = param_get_string,
1197 static struct kparam_string batadv_param_string_ra = {
1198 .maxlen = sizeof(batadv_routing_algo),
1199 .string = batadv_routing_algo,
1202 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
1204 module_init(batadv_init);
1205 module_exit(batadv_exit);
1207 MODULE_LICENSE("GPL");
1209 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
1210 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
1211 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
1212 MODULE_VERSION(BATADV_SOURCE_VERSION);