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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 #include <linux/crc32c.h>
21 #include <linux/highmem.h>
27 #include "originator.h"
28 #include "soft-interface.h"
29 #include "icmp_socket.h"
30 #include "translation-table.h"
31 #include "hard-interface.h"
32 #include "gateway_client.h"
33 #include "bridge_loop_avoidance.h"
34 #include "distributed-arp-table.h"
38 #include "network-coding.h"
41 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
42 * list traversals just rcu-locked
44 struct list_head batadv_hardif_list
;
45 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
46 struct batadv_hard_iface
*);
47 char batadv_routing_algo
[20] = "BATMAN_IV";
48 static struct hlist_head batadv_algo_list
;
50 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
52 struct workqueue_struct
*batadv_event_workqueue
;
54 static void batadv_recv_handler_init(void);
56 static int __init
batadv_init(void)
58 INIT_LIST_HEAD(&batadv_hardif_list
);
59 INIT_HLIST_HEAD(&batadv_algo_list
);
61 batadv_recv_handler_init();
65 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
67 if (!batadv_event_workqueue
)
71 batadv_debugfs_init();
73 register_netdevice_notifier(&batadv_hard_if_notifier
);
74 rtnl_link_register(&batadv_link_ops
);
76 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
77 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
82 static void __exit
batadv_exit(void)
84 batadv_debugfs_destroy();
85 rtnl_link_unregister(&batadv_link_ops
);
86 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
87 batadv_hardif_remove_interfaces();
89 flush_workqueue(batadv_event_workqueue
);
90 destroy_workqueue(batadv_event_workqueue
);
91 batadv_event_workqueue
= NULL
;
96 int batadv_mesh_init(struct net_device
*soft_iface
)
98 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
101 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
102 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
103 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
104 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
105 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
106 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
107 spin_lock_init(&bat_priv
->gw
.list_lock
);
108 spin_lock_init(&bat_priv
->vis
.hash_lock
);
109 spin_lock_init(&bat_priv
->vis
.list_lock
);
111 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
112 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
113 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
114 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
115 INIT_LIST_HEAD(&bat_priv
->tt
.req_list
);
116 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
118 ret
= batadv_originator_init(bat_priv
);
122 ret
= batadv_tt_init(bat_priv
);
126 batadv_tt_local_add(soft_iface
, soft_iface
->dev_addr
,
127 BATADV_NULL_IFINDEX
);
129 ret
= batadv_vis_init(bat_priv
);
133 ret
= batadv_bla_init(bat_priv
);
137 ret
= batadv_dat_init(bat_priv
);
141 ret
= batadv_nc_init(bat_priv
);
145 atomic_set(&bat_priv
->gw
.reselect
, 0);
146 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
151 batadv_mesh_free(soft_iface
);
155 void batadv_mesh_free(struct net_device
*soft_iface
)
157 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
159 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
161 batadv_purge_outstanding_packets(bat_priv
, NULL
);
163 batadv_vis_quit(bat_priv
);
165 batadv_gw_node_purge(bat_priv
);
166 batadv_nc_free(bat_priv
);
167 batadv_dat_free(bat_priv
);
168 batadv_bla_free(bat_priv
);
170 /* Free the TT and the originator tables only after having terminated
171 * all the other depending components which may use these structures for
174 batadv_tt_free(bat_priv
);
176 /* Since the originator table clean up routine is accessing the TT
177 * tables as well, it has to be invoked after the TT tables have been
178 * freed and marked as empty. This ensures that no cleanup RCU callbacks
179 * accessing the TT data are scheduled for later execution.
181 batadv_originator_free(bat_priv
);
183 free_percpu(bat_priv
->bat_counters
);
185 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
189 * batadv_is_my_mac - check if the given mac address belongs to any of the real
190 * interfaces in the current mesh
191 * @bat_priv: the bat priv with all the soft interface information
192 * @addr: the address to check
194 int batadv_is_my_mac(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
196 const struct batadv_hard_iface
*hard_iface
;
199 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
200 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
203 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
206 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
216 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
217 * function that requires the primary interface
218 * @seq: debugfs table seq_file struct
220 * Returns primary interface if found or NULL otherwise.
222 struct batadv_hard_iface
*
223 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
225 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
226 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
227 struct batadv_hard_iface
*primary_if
;
229 primary_if
= batadv_primary_if_get_selected(bat_priv
);
233 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
238 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
242 "BATMAN mesh %s disabled - primary interface not active\n",
244 batadv_hardif_free_ref(primary_if
);
251 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
252 struct batadv_hard_iface
*recv_if
)
257 /* incoming packets with the batman ethertype received on any active hard
260 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
261 struct packet_type
*ptype
,
262 struct net_device
*orig_dev
)
264 struct batadv_priv
*bat_priv
;
265 struct batadv_ogm_packet
*batadv_ogm_packet
;
266 struct batadv_hard_iface
*hard_iface
;
270 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
272 skb
= skb_share_check(skb
, GFP_ATOMIC
);
274 /* skb was released by skb_share_check() */
278 /* packet should hold at least type and version */
279 if (unlikely(!pskb_may_pull(skb
, 2)))
282 /* expect a valid ethernet header here. */
283 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
286 if (!hard_iface
->soft_iface
)
289 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
291 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
294 /* discard frames on not active interfaces */
295 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
298 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
300 if (batadv_ogm_packet
->header
.version
!= BATADV_COMPAT_VERSION
) {
301 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
302 "Drop packet: incompatible batman version (%i)\n",
303 batadv_ogm_packet
->header
.version
);
307 /* all receive handlers return whether they received or reused
308 * the supplied skb. if not, we have to free the skb.
310 idx
= batadv_ogm_packet
->header
.packet_type
;
311 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
313 if (ret
== NET_RX_DROP
)
316 /* return NET_RX_SUCCESS in any case as we
317 * most probably dropped the packet for
318 * routing-logical reasons.
320 return NET_RX_SUCCESS
;
328 static void batadv_recv_handler_init(void)
332 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
333 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
335 /* batman icmp packet */
336 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
337 /* unicast with 4 addresses packet */
338 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
340 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
341 /* fragmented unicast packet */
342 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_ucast_frag_packet
;
343 /* broadcast packet */
344 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
346 batadv_rx_handler
[BATADV_VIS
] = batadv_recv_vis_packet
;
347 /* Translation table query (request or response) */
348 batadv_rx_handler
[BATADV_TT_QUERY
] = batadv_recv_tt_query
;
349 /* Roaming advertisement */
350 batadv_rx_handler
[BATADV_ROAM_ADV
] = batadv_recv_roam_adv
;
354 batadv_recv_handler_register(uint8_t packet_type
,
355 int (*recv_handler
)(struct sk_buff
*,
356 struct batadv_hard_iface
*))
358 if (batadv_rx_handler
[packet_type
] != &batadv_recv_unhandled_packet
)
361 batadv_rx_handler
[packet_type
] = recv_handler
;
365 void batadv_recv_handler_unregister(uint8_t packet_type
)
367 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
370 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
372 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
374 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
375 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
378 bat_algo_ops
= bat_algo_ops_tmp
;
385 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
387 struct batadv_algo_ops
*bat_algo_ops_tmp
;
390 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
391 if (bat_algo_ops_tmp
) {
392 pr_info("Trying to register already registered routing algorithm: %s\n",
398 /* all algorithms must implement all ops (for now) */
399 if (!bat_algo_ops
->bat_iface_enable
||
400 !bat_algo_ops
->bat_iface_disable
||
401 !bat_algo_ops
->bat_iface_update_mac
||
402 !bat_algo_ops
->bat_primary_iface_set
||
403 !bat_algo_ops
->bat_ogm_schedule
||
404 !bat_algo_ops
->bat_ogm_emit
) {
405 pr_info("Routing algo '%s' does not implement required ops\n",
411 INIT_HLIST_NODE(&bat_algo_ops
->list
);
412 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
419 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
421 struct batadv_algo_ops
*bat_algo_ops
;
424 bat_algo_ops
= batadv_algo_get(name
);
428 bat_priv
->bat_algo_ops
= bat_algo_ops
;
435 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
437 struct batadv_algo_ops
*bat_algo_ops
;
439 seq_puts(seq
, "Available routing algorithms:\n");
441 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
442 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
449 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
451 * @skb: skb pointing to fragmented socket buffers
452 * @payload_ptr: Pointer to position inside the head buffer of the skb
453 * marking the start of the data to be CRC'ed
455 * payload_ptr must always point to an address in the skb head buffer and not to
458 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
462 unsigned int to
= skb
->len
;
463 struct skb_seq_state st
;
466 unsigned int consumed
= 0;
468 from
= (unsigned int)(payload_ptr
- skb
->data
);
470 skb_prepare_seq_read(skb
, from
, to
, &st
);
471 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
472 crc
= crc32c(crc
, data
, len
);
475 skb_abort_seq_read(&st
);
480 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
482 struct batadv_algo_ops
*bat_algo_ops
;
483 char *algo_name
= (char *)val
;
484 size_t name_len
= strlen(algo_name
);
486 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
487 algo_name
[name_len
- 1] = '\0';
489 bat_algo_ops
= batadv_algo_get(algo_name
);
491 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
495 return param_set_copystring(algo_name
, kp
);
498 static const struct kernel_param_ops batadv_param_ops_ra
= {
499 .set
= batadv_param_set_ra
,
500 .get
= param_get_string
,
503 static struct kparam_string batadv_param_string_ra
= {
504 .maxlen
= sizeof(batadv_routing_algo
),
505 .string
= batadv_routing_algo
,
508 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
510 module_init(batadv_init
);
511 module_exit(batadv_exit
);
513 MODULE_LICENSE("GPL");
515 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
516 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
517 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
518 MODULE_VERSION(BATADV_SOURCE_VERSION
);