1 /* Copyright (C) 2007-2012 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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "originator.h"
26 #include "soft-interface.h"
27 #include "icmp_socket.h"
28 #include "translation-table.h"
29 #include "hard-interface.h"
30 #include "gateway_client.h"
31 #include "bridge_loop_avoidance.h"
37 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
38 * list traversals just rcu-locked
40 struct list_head batadv_hardif_list
;
41 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
42 struct batadv_hard_iface
*);
43 char batadv_routing_algo
[20] = "BATMAN_IV";
44 static struct hlist_head batadv_algo_list
;
46 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
48 struct workqueue_struct
*batadv_event_workqueue
;
50 static void batadv_recv_handler_init(void);
52 static int __init
batadv_init(void)
54 INIT_LIST_HEAD(&batadv_hardif_list
);
55 INIT_HLIST_HEAD(&batadv_algo_list
);
57 batadv_recv_handler_init();
61 /* the name should not be longer than 10 chars - see
62 * http://lwn.net/Articles/23634/
64 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
66 if (!batadv_event_workqueue
)
70 batadv_debugfs_init();
72 register_netdevice_notifier(&batadv_hard_if_notifier
);
74 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
75 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
80 static void __exit
batadv_exit(void)
82 batadv_debugfs_destroy();
83 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
84 batadv_hardif_remove_interfaces();
86 flush_workqueue(batadv_event_workqueue
);
87 destroy_workqueue(batadv_event_workqueue
);
88 batadv_event_workqueue
= NULL
;
93 int batadv_mesh_init(struct net_device
*soft_iface
)
95 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
98 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
99 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
100 spin_lock_init(&bat_priv
->tt_changes_list_lock
);
101 spin_lock_init(&bat_priv
->tt_req_list_lock
);
102 spin_lock_init(&bat_priv
->tt_roam_list_lock
);
103 spin_lock_init(&bat_priv
->tt_buff_lock
);
104 spin_lock_init(&bat_priv
->gw_list_lock
);
105 spin_lock_init(&bat_priv
->vis_hash_lock
);
106 spin_lock_init(&bat_priv
->vis_list_lock
);
108 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
109 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
110 INIT_HLIST_HEAD(&bat_priv
->gw_list
);
111 INIT_LIST_HEAD(&bat_priv
->tt_changes_list
);
112 INIT_LIST_HEAD(&bat_priv
->tt_req_list
);
113 INIT_LIST_HEAD(&bat_priv
->tt_roam_list
);
115 ret
= batadv_originator_init(bat_priv
);
119 ret
= batadv_tt_init(bat_priv
);
123 batadv_tt_local_add(soft_iface
, soft_iface
->dev_addr
,
124 BATADV_NULL_IFINDEX
);
126 ret
= batadv_vis_init(bat_priv
);
130 ret
= batadv_bla_init(bat_priv
);
134 atomic_set(&bat_priv
->gw_reselect
, 0);
135 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
140 batadv_mesh_free(soft_iface
);
144 void batadv_mesh_free(struct net_device
*soft_iface
)
146 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
148 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
150 batadv_purge_outstanding_packets(bat_priv
, NULL
);
152 batadv_vis_quit(bat_priv
);
154 batadv_gw_node_purge(bat_priv
);
155 batadv_originator_free(bat_priv
);
157 batadv_tt_free(bat_priv
);
159 batadv_bla_free(bat_priv
);
161 free_percpu(bat_priv
->bat_counters
);
163 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
166 void batadv_inc_module_count(void)
168 try_module_get(THIS_MODULE
);
171 void batadv_dec_module_count(void)
173 module_put(THIS_MODULE
);
176 int batadv_is_my_mac(const uint8_t *addr
)
178 const struct batadv_hard_iface
*hard_iface
;
181 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
182 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
185 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
194 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
195 struct batadv_hard_iface
*recv_if
)
200 /* incoming packets with the batman ethertype received on any active hard
203 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
204 struct packet_type
*ptype
,
205 struct net_device
*orig_dev
)
207 struct batadv_priv
*bat_priv
;
208 struct batadv_ogm_packet
*batadv_ogm_packet
;
209 struct batadv_hard_iface
*hard_iface
;
213 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
215 skb
= skb_share_check(skb
, GFP_ATOMIC
);
217 /* skb was released by skb_share_check() */
221 /* packet should hold at least type and version */
222 if (unlikely(!pskb_may_pull(skb
, 2)))
225 /* expect a valid ethernet header here. */
226 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
229 if (!hard_iface
->soft_iface
)
232 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
234 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
237 /* discard frames on not active interfaces */
238 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
241 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
243 if (batadv_ogm_packet
->header
.version
!= BATADV_COMPAT_VERSION
) {
244 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
245 "Drop packet: incompatible batman version (%i)\n",
246 batadv_ogm_packet
->header
.version
);
250 /* all receive handlers return whether they received or reused
251 * the supplied skb. if not, we have to free the skb.
253 idx
= batadv_ogm_packet
->header
.packet_type
;
254 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
256 if (ret
== NET_RX_DROP
)
259 /* return NET_RX_SUCCESS in any case as we
260 * most probably dropped the packet for
261 * routing-logical reasons.
263 return NET_RX_SUCCESS
;
271 static void batadv_recv_handler_init(void)
275 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
276 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
278 /* batman icmp packet */
279 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
281 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
282 /* fragmented unicast packet */
283 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_ucast_frag_packet
;
284 /* broadcast packet */
285 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
287 batadv_rx_handler
[BATADV_VIS
] = batadv_recv_vis_packet
;
288 /* Translation table query (request or response) */
289 batadv_rx_handler
[BATADV_TT_QUERY
] = batadv_recv_tt_query
;
290 /* Roaming advertisement */
291 batadv_rx_handler
[BATADV_ROAM_ADV
] = batadv_recv_roam_adv
;
295 batadv_recv_handler_register(uint8_t packet_type
,
296 int (*recv_handler
)(struct sk_buff
*,
297 struct batadv_hard_iface
*))
299 if (batadv_rx_handler
[packet_type
] != &batadv_recv_unhandled_packet
)
302 batadv_rx_handler
[packet_type
] = recv_handler
;
306 void batadv_recv_handler_unregister(uint8_t packet_type
)
308 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
311 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
313 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
314 struct hlist_node
*node
;
316 hlist_for_each_entry(bat_algo_ops_tmp
, node
, &batadv_algo_list
, list
) {
317 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
320 bat_algo_ops
= bat_algo_ops_tmp
;
327 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
329 struct batadv_algo_ops
*bat_algo_ops_tmp
;
332 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
333 if (bat_algo_ops_tmp
) {
334 pr_info("Trying to register already registered routing algorithm: %s\n",
340 /* all algorithms must implement all ops (for now) */
341 if (!bat_algo_ops
->bat_iface_enable
||
342 !bat_algo_ops
->bat_iface_disable
||
343 !bat_algo_ops
->bat_iface_update_mac
||
344 !bat_algo_ops
->bat_primary_iface_set
||
345 !bat_algo_ops
->bat_ogm_schedule
||
346 !bat_algo_ops
->bat_ogm_emit
) {
347 pr_info("Routing algo '%s' does not implement required ops\n",
353 INIT_HLIST_NODE(&bat_algo_ops
->list
);
354 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
361 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
363 struct batadv_algo_ops
*bat_algo_ops
;
366 bat_algo_ops
= batadv_algo_get(name
);
370 bat_priv
->bat_algo_ops
= bat_algo_ops
;
377 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
379 struct batadv_algo_ops
*bat_algo_ops
;
380 struct hlist_node
*node
;
382 seq_printf(seq
, "Available routing algorithms:\n");
384 hlist_for_each_entry(bat_algo_ops
, node
, &batadv_algo_list
, list
) {
385 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
391 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
393 struct batadv_algo_ops
*bat_algo_ops
;
394 char *algo_name
= (char *)val
;
395 size_t name_len
= strlen(algo_name
);
397 if (algo_name
[name_len
- 1] == '\n')
398 algo_name
[name_len
- 1] = '\0';
400 bat_algo_ops
= batadv_algo_get(algo_name
);
402 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
406 return param_set_copystring(algo_name
, kp
);
409 static const struct kernel_param_ops batadv_param_ops_ra
= {
410 .set
= batadv_param_set_ra
,
411 .get
= param_get_string
,
414 static struct kparam_string batadv_param_string_ra
= {
415 .maxlen
= sizeof(batadv_routing_algo
),
416 .string
= batadv_routing_algo
,
419 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
421 module_init(batadv_init
);
422 module_exit(batadv_exit
);
424 MODULE_LICENSE("GPL");
426 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
427 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
428 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
429 MODULE_VERSION(BATADV_SOURCE_VERSION
);