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
21 #include "distributed-arp-table.h"
24 #include "translation-table.h"
25 #include "soft-interface.h"
26 #include "hard-interface.h"
28 #include "gateway_common.h"
29 #include "originator.h"
31 #include <linux/if_ether.h>
33 static void batadv_send_outstanding_bcast_packet(struct work_struct
*work
);
35 /* send out an already prepared packet to the given address via the
36 * specified batman interface
38 int batadv_send_skb_packet(struct sk_buff
*skb
,
39 struct batadv_hard_iface
*hard_iface
,
40 const uint8_t *dst_addr
)
42 struct ethhdr
*ethhdr
;
44 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
47 if (unlikely(!hard_iface
->net_dev
))
50 if (!(hard_iface
->net_dev
->flags
& IFF_UP
)) {
51 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
52 hard_iface
->net_dev
->name
);
56 /* push to the ethernet header. */
57 if (batadv_skb_head_push(skb
, ETH_HLEN
) < 0)
60 skb_reset_mac_header(skb
);
62 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
63 memcpy(ethhdr
->h_source
, hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
64 memcpy(ethhdr
->h_dest
, dst_addr
, ETH_ALEN
);
65 ethhdr
->h_proto
= __constant_htons(ETH_P_BATMAN
);
67 skb_set_network_header(skb
, ETH_HLEN
);
68 skb
->priority
= TC_PRIO_CONTROL
;
69 skb
->protocol
= __constant_htons(ETH_P_BATMAN
);
71 skb
->dev
= hard_iface
->net_dev
;
73 /* dev_queue_xmit() returns a negative result on error. However on
74 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
75 * (which is > 0). This will not be treated as an error.
77 return dev_queue_xmit(skb
);
84 * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
85 * @skb: Packet to be transmitted.
86 * @orig_node: Final destination of the packet.
87 * @recv_if: Interface used when receiving the packet (can be NULL).
89 * Looks up the best next-hop towards the passed originator and passes the
90 * skb on for preparation of MAC header. If the packet originated from this
91 * host, NULL can be passed as recv_if and no interface alternating is
94 * Returns TRUE on success; FALSE otherwise.
96 bool batadv_send_skb_to_orig(struct sk_buff
*skb
,
97 struct batadv_orig_node
*orig_node
,
98 struct batadv_hard_iface
*recv_if
)
100 struct batadv_priv
*bat_priv
= orig_node
->bat_priv
;
101 struct batadv_neigh_node
*neigh_node
;
103 /* batadv_find_router() increases neigh_nodes refcount if found. */
104 neigh_node
= batadv_find_router(bat_priv
, orig_node
, recv_if
);
109 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
111 batadv_neigh_node_free_ref(neigh_node
);
116 void batadv_schedule_bat_ogm(struct batadv_hard_iface
*hard_iface
)
118 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
120 if ((hard_iface
->if_status
== BATADV_IF_NOT_IN_USE
) ||
121 (hard_iface
->if_status
== BATADV_IF_TO_BE_REMOVED
))
124 /* the interface gets activated here to avoid race conditions between
125 * the moment of activating the interface in
126 * hardif_activate_interface() where the originator mac is set and
127 * outdated packets (especially uninitialized mac addresses) in the
130 if (hard_iface
->if_status
== BATADV_IF_TO_BE_ACTIVATED
)
131 hard_iface
->if_status
= BATADV_IF_ACTIVE
;
133 bat_priv
->bat_algo_ops
->bat_ogm_schedule(hard_iface
);
136 static void batadv_forw_packet_free(struct batadv_forw_packet
*forw_packet
)
138 if (forw_packet
->skb
)
139 kfree_skb(forw_packet
->skb
);
140 if (forw_packet
->if_incoming
)
141 batadv_hardif_free_ref(forw_packet
->if_incoming
);
146 _batadv_add_bcast_packet_to_list(struct batadv_priv
*bat_priv
,
147 struct batadv_forw_packet
*forw_packet
,
148 unsigned long send_time
)
150 INIT_HLIST_NODE(&forw_packet
->list
);
152 /* add new packet to packet list */
153 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
154 hlist_add_head(&forw_packet
->list
, &bat_priv
->forw_bcast_list
);
155 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
157 /* start timer for this packet */
158 INIT_DELAYED_WORK(&forw_packet
->delayed_work
,
159 batadv_send_outstanding_bcast_packet
);
160 queue_delayed_work(batadv_event_workqueue
, &forw_packet
->delayed_work
,
164 /* add a broadcast packet to the queue and setup timers. broadcast packets
165 * are sent multiple times to increase probability for being received.
167 * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
170 * The skb is not consumed, so the caller should make sure that the
173 int batadv_add_bcast_packet_to_list(struct batadv_priv
*bat_priv
,
174 const struct sk_buff
*skb
,
177 struct batadv_hard_iface
*primary_if
= NULL
;
178 struct batadv_forw_packet
*forw_packet
;
179 struct batadv_bcast_packet
*bcast_packet
;
180 struct sk_buff
*newskb
;
182 if (!batadv_atomic_dec_not_zero(&bat_priv
->bcast_queue_left
)) {
183 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
184 "bcast packet queue full\n");
188 primary_if
= batadv_primary_if_get_selected(bat_priv
);
192 forw_packet
= kmalloc(sizeof(*forw_packet
), GFP_ATOMIC
);
197 newskb
= skb_copy(skb
, GFP_ATOMIC
);
201 /* as we have a copy now, it is safe to decrease the TTL */
202 bcast_packet
= (struct batadv_bcast_packet
*)newskb
->data
;
203 bcast_packet
->header
.ttl
--;
205 skb_reset_mac_header(newskb
);
207 forw_packet
->skb
= newskb
;
208 forw_packet
->if_incoming
= primary_if
;
210 /* how often did we send the bcast packet ? */
211 forw_packet
->num_packets
= 0;
213 _batadv_add_bcast_packet_to_list(bat_priv
, forw_packet
, delay
);
219 atomic_inc(&bat_priv
->bcast_queue_left
);
222 batadv_hardif_free_ref(primary_if
);
223 return NETDEV_TX_BUSY
;
226 static void batadv_send_outstanding_bcast_packet(struct work_struct
*work
)
228 struct batadv_hard_iface
*hard_iface
;
229 struct delayed_work
*delayed_work
;
230 struct batadv_forw_packet
*forw_packet
;
231 struct sk_buff
*skb1
;
232 struct net_device
*soft_iface
;
233 struct batadv_priv
*bat_priv
;
235 delayed_work
= container_of(work
, struct delayed_work
, work
);
236 forw_packet
= container_of(delayed_work
, struct batadv_forw_packet
,
238 soft_iface
= forw_packet
->if_incoming
->soft_iface
;
239 bat_priv
= netdev_priv(soft_iface
);
241 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
242 hlist_del(&forw_packet
->list
);
243 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
245 if (atomic_read(&bat_priv
->mesh_state
) == BATADV_MESH_DEACTIVATING
)
248 if (batadv_dat_drop_broadcast_packet(bat_priv
, forw_packet
))
251 /* rebroadcast packet */
253 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
254 if (hard_iface
->soft_iface
!= soft_iface
)
257 /* send a copy of the saved skb */
258 skb1
= skb_clone(forw_packet
->skb
, GFP_ATOMIC
);
260 batadv_send_skb_packet(skb1
, hard_iface
,
261 batadv_broadcast_addr
);
265 forw_packet
->num_packets
++;
267 /* if we still have some more bcasts to send */
268 if (forw_packet
->num_packets
< 3) {
269 _batadv_add_bcast_packet_to_list(bat_priv
, forw_packet
,
270 msecs_to_jiffies(5));
275 batadv_forw_packet_free(forw_packet
);
276 atomic_inc(&bat_priv
->bcast_queue_left
);
279 void batadv_send_outstanding_bat_ogm_packet(struct work_struct
*work
)
281 struct delayed_work
*delayed_work
;
282 struct batadv_forw_packet
*forw_packet
;
283 struct batadv_priv
*bat_priv
;
285 delayed_work
= container_of(work
, struct delayed_work
, work
);
286 forw_packet
= container_of(delayed_work
, struct batadv_forw_packet
,
288 bat_priv
= netdev_priv(forw_packet
->if_incoming
->soft_iface
);
289 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
290 hlist_del(&forw_packet
->list
);
291 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
293 if (atomic_read(&bat_priv
->mesh_state
) == BATADV_MESH_DEACTIVATING
)
296 bat_priv
->bat_algo_ops
->bat_ogm_emit(forw_packet
);
298 /* we have to have at least one packet in the queue
299 * to determine the queues wake up time unless we are
302 if (forw_packet
->own
)
303 batadv_schedule_bat_ogm(forw_packet
->if_incoming
);
306 /* don't count own packet */
307 if (!forw_packet
->own
)
308 atomic_inc(&bat_priv
->batman_queue_left
);
310 batadv_forw_packet_free(forw_packet
);
314 batadv_purge_outstanding_packets(struct batadv_priv
*bat_priv
,
315 const struct batadv_hard_iface
*hard_iface
)
317 struct batadv_forw_packet
*forw_packet
;
318 struct hlist_node
*tmp_node
, *safe_tmp_node
;
322 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
323 "purge_outstanding_packets(): %s\n",
324 hard_iface
->net_dev
->name
);
326 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
327 "purge_outstanding_packets()\n");
329 /* free bcast list */
330 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
331 hlist_for_each_entry_safe(forw_packet
, tmp_node
, safe_tmp_node
,
332 &bat_priv
->forw_bcast_list
, list
) {
334 /* if purge_outstanding_packets() was called with an argument
335 * we delete only packets belonging to the given interface
338 (forw_packet
->if_incoming
!= hard_iface
))
341 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
343 /* batadv_send_outstanding_bcast_packet() will lock the list to
344 * delete the item from the list
346 pending
= cancel_delayed_work_sync(&forw_packet
->delayed_work
);
347 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
350 hlist_del(&forw_packet
->list
);
351 batadv_forw_packet_free(forw_packet
);
354 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
356 /* free batman packet list */
357 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
358 hlist_for_each_entry_safe(forw_packet
, tmp_node
, safe_tmp_node
,
359 &bat_priv
->forw_bat_list
, list
) {
361 /* if purge_outstanding_packets() was called with an argument
362 * we delete only packets belonging to the given interface
365 (forw_packet
->if_incoming
!= hard_iface
))
368 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
370 /* send_outstanding_bat_packet() will lock the list to
371 * delete the item from the list
373 pending
= cancel_delayed_work_sync(&forw_packet
->delayed_work
);
374 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
377 hlist_del(&forw_packet
->list
);
378 batadv_forw_packet_free(forw_packet
);
381 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);