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
23 #include "translation-table.h"
24 #include "soft-interface.h"
25 #include "hard-interface.h"
27 #include "gateway_common.h"
28 #include "originator.h"
30 static void send_outstanding_bcast_packet(struct work_struct
*work
);
32 /* send out an already prepared packet to the given address via the
33 * specified batman interface
35 int batadv_send_skb_packet(struct sk_buff
*skb
, struct hard_iface
*hard_iface
,
36 const uint8_t *dst_addr
)
38 struct ethhdr
*ethhdr
;
40 if (hard_iface
->if_status
!= IF_ACTIVE
)
43 if (unlikely(!hard_iface
->net_dev
))
46 if (!(hard_iface
->net_dev
->flags
& IFF_UP
)) {
47 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
48 hard_iface
->net_dev
->name
);
52 /* push to the ethernet header. */
53 if (batadv_skb_head_push(skb
, ETH_HLEN
) < 0)
56 skb_reset_mac_header(skb
);
58 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
59 memcpy(ethhdr
->h_source
, hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
60 memcpy(ethhdr
->h_dest
, dst_addr
, ETH_ALEN
);
61 ethhdr
->h_proto
= __constant_htons(ETH_P_BATMAN
);
63 skb_set_network_header(skb
, ETH_HLEN
);
64 skb
->priority
= TC_PRIO_CONTROL
;
65 skb
->protocol
= __constant_htons(ETH_P_BATMAN
);
67 skb
->dev
= hard_iface
->net_dev
;
69 /* dev_queue_xmit() returns a negative result on error. However on
70 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
71 * (which is > 0). This will not be treated as an error.
73 return dev_queue_xmit(skb
);
79 void batadv_schedule_bat_ogm(struct hard_iface
*hard_iface
)
81 struct bat_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
83 if ((hard_iface
->if_status
== IF_NOT_IN_USE
) ||
84 (hard_iface
->if_status
== IF_TO_BE_REMOVED
))
87 /* the interface gets activated here to avoid race conditions between
88 * the moment of activating the interface in
89 * hardif_activate_interface() where the originator mac is set and
90 * outdated packets (especially uninitialized mac addresses) in the
93 if (hard_iface
->if_status
== IF_TO_BE_ACTIVATED
)
94 hard_iface
->if_status
= IF_ACTIVE
;
96 bat_priv
->bat_algo_ops
->bat_ogm_schedule(hard_iface
);
99 static void forw_packet_free(struct forw_packet
*forw_packet
)
101 if (forw_packet
->skb
)
102 kfree_skb(forw_packet
->skb
);
103 if (forw_packet
->if_incoming
)
104 batadv_hardif_free_ref(forw_packet
->if_incoming
);
108 static void _add_bcast_packet_to_list(struct bat_priv
*bat_priv
,
109 struct forw_packet
*forw_packet
,
110 unsigned long send_time
)
112 INIT_HLIST_NODE(&forw_packet
->list
);
114 /* add new packet to packet list */
115 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
116 hlist_add_head(&forw_packet
->list
, &bat_priv
->forw_bcast_list
);
117 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
119 /* start timer for this packet */
120 INIT_DELAYED_WORK(&forw_packet
->delayed_work
,
121 send_outstanding_bcast_packet
);
122 queue_delayed_work(batadv_event_workqueue
, &forw_packet
->delayed_work
,
126 /* add a broadcast packet to the queue and setup timers. broadcast packets
127 * are sent multiple times to increase probability for being received.
129 * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
132 * The skb is not consumed, so the caller should make sure that the
135 int batadv_add_bcast_packet_to_list(struct bat_priv
*bat_priv
,
136 const struct sk_buff
*skb
,
139 struct hard_iface
*primary_if
= NULL
;
140 struct forw_packet
*forw_packet
;
141 struct bcast_packet
*bcast_packet
;
142 struct sk_buff
*newskb
;
144 if (!atomic_dec_not_zero(&bat_priv
->bcast_queue_left
)) {
145 bat_dbg(DBG_BATMAN
, bat_priv
, "bcast packet queue full\n");
149 primary_if
= batadv_primary_if_get_selected(bat_priv
);
153 forw_packet
= kmalloc(sizeof(*forw_packet
), GFP_ATOMIC
);
158 newskb
= skb_copy(skb
, GFP_ATOMIC
);
162 /* as we have a copy now, it is safe to decrease the TTL */
163 bcast_packet
= (struct bcast_packet
*)newskb
->data
;
164 bcast_packet
->header
.ttl
--;
166 skb_reset_mac_header(newskb
);
168 forw_packet
->skb
= newskb
;
169 forw_packet
->if_incoming
= primary_if
;
171 /* how often did we send the bcast packet ? */
172 forw_packet
->num_packets
= 0;
174 _add_bcast_packet_to_list(bat_priv
, forw_packet
, delay
);
180 atomic_inc(&bat_priv
->bcast_queue_left
);
183 batadv_hardif_free_ref(primary_if
);
184 return NETDEV_TX_BUSY
;
187 static void send_outstanding_bcast_packet(struct work_struct
*work
)
189 struct hard_iface
*hard_iface
;
190 struct delayed_work
*delayed_work
=
191 container_of(work
, struct delayed_work
, work
);
192 struct forw_packet
*forw_packet
=
193 container_of(delayed_work
, struct forw_packet
, delayed_work
);
194 struct sk_buff
*skb1
;
195 struct net_device
*soft_iface
= forw_packet
->if_incoming
->soft_iface
;
196 struct bat_priv
*bat_priv
= netdev_priv(soft_iface
);
198 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
199 hlist_del(&forw_packet
->list
);
200 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
202 if (atomic_read(&bat_priv
->mesh_state
) == MESH_DEACTIVATING
)
205 /* rebroadcast packet */
207 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
208 if (hard_iface
->soft_iface
!= soft_iface
)
211 /* send a copy of the saved skb */
212 skb1
= skb_clone(forw_packet
->skb
, GFP_ATOMIC
);
214 batadv_send_skb_packet(skb1
, hard_iface
,
215 batadv_broadcast_addr
);
219 forw_packet
->num_packets
++;
221 /* if we still have some more bcasts to send */
222 if (forw_packet
->num_packets
< 3) {
223 _add_bcast_packet_to_list(bat_priv
, forw_packet
,
224 msecs_to_jiffies(5));
229 forw_packet_free(forw_packet
);
230 atomic_inc(&bat_priv
->bcast_queue_left
);
233 void batadv_send_outstanding_bat_ogm_packet(struct work_struct
*work
)
235 struct delayed_work
*delayed_work
=
236 container_of(work
, struct delayed_work
, work
);
237 struct forw_packet
*forw_packet
=
238 container_of(delayed_work
, struct forw_packet
, delayed_work
);
239 struct bat_priv
*bat_priv
;
241 bat_priv
= netdev_priv(forw_packet
->if_incoming
->soft_iface
);
242 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
243 hlist_del(&forw_packet
->list
);
244 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
246 if (atomic_read(&bat_priv
->mesh_state
) == MESH_DEACTIVATING
)
249 bat_priv
->bat_algo_ops
->bat_ogm_emit(forw_packet
);
251 /* we have to have at least one packet in the queue
252 * to determine the queues wake up time unless we are
255 if (forw_packet
->own
)
256 batadv_schedule_bat_ogm(forw_packet
->if_incoming
);
259 /* don't count own packet */
260 if (!forw_packet
->own
)
261 atomic_inc(&bat_priv
->batman_queue_left
);
263 forw_packet_free(forw_packet
);
266 void batadv_purge_outstanding_packets(struct bat_priv
*bat_priv
,
267 const struct hard_iface
*hard_iface
)
269 struct forw_packet
*forw_packet
;
270 struct hlist_node
*tmp_node
, *safe_tmp_node
;
274 bat_dbg(DBG_BATMAN
, bat_priv
,
275 "purge_outstanding_packets(): %s\n",
276 hard_iface
->net_dev
->name
);
278 bat_dbg(DBG_BATMAN
, bat_priv
,
279 "purge_outstanding_packets()\n");
281 /* free bcast list */
282 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
283 hlist_for_each_entry_safe(forw_packet
, tmp_node
, safe_tmp_node
,
284 &bat_priv
->forw_bcast_list
, list
) {
286 /* if purge_outstanding_packets() was called with an argument
287 * we delete only packets belonging to the given interface
290 (forw_packet
->if_incoming
!= hard_iface
))
293 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
295 /* send_outstanding_bcast_packet() will lock the list to
296 * delete the item from the list
298 pending
= cancel_delayed_work_sync(&forw_packet
->delayed_work
);
299 spin_lock_bh(&bat_priv
->forw_bcast_list_lock
);
302 hlist_del(&forw_packet
->list
);
303 forw_packet_free(forw_packet
);
306 spin_unlock_bh(&bat_priv
->forw_bcast_list_lock
);
308 /* free batman packet list */
309 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
310 hlist_for_each_entry_safe(forw_packet
, tmp_node
, safe_tmp_node
,
311 &bat_priv
->forw_bat_list
, list
) {
313 /* if purge_outstanding_packets() was called with an argument
314 * we delete only packets belonging to the given interface
317 (forw_packet
->if_incoming
!= hard_iface
))
320 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
322 /* send_outstanding_bat_packet() will lock the list to
323 * delete the item from the list
325 pending
= cancel_delayed_work_sync(&forw_packet
->delayed_work
);
326 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
329 hlist_del(&forw_packet
->list
);
330 forw_packet_free(forw_packet
);
333 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);