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
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 queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
162 /* add a broadcast packet to the queue and setup timers. broadcast packets
163 * are sent multiple times to increase probability for being received.
165 * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
168 * The skb is not consumed, so the caller should make sure that the
171 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
172 const struct sk_buff *skb,
175 struct batadv_hard_iface *primary_if = NULL;
176 struct batadv_forw_packet *forw_packet;
177 struct batadv_bcast_packet *bcast_packet;
178 struct sk_buff *newskb;
180 if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
181 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
182 "bcast packet queue full\n");
186 primary_if = batadv_primary_if_get_selected(bat_priv);
190 forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
195 newskb = skb_copy(skb, GFP_ATOMIC);
199 /* as we have a copy now, it is safe to decrease the TTL */
200 bcast_packet = (struct batadv_bcast_packet *)newskb->data;
201 bcast_packet->header.ttl--;
203 skb_reset_mac_header(newskb);
205 forw_packet->skb = newskb;
206 forw_packet->if_incoming = primary_if;
208 /* how often did we send the bcast packet ? */
209 forw_packet->num_packets = 0;
211 INIT_DELAYED_WORK(&forw_packet->delayed_work,
212 batadv_send_outstanding_bcast_packet);
214 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
220 atomic_inc(&bat_priv->bcast_queue_left);
223 batadv_hardif_free_ref(primary_if);
224 return NETDEV_TX_BUSY;
227 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
229 struct batadv_hard_iface *hard_iface;
230 struct delayed_work *delayed_work;
231 struct batadv_forw_packet *forw_packet;
232 struct sk_buff *skb1;
233 struct net_device *soft_iface;
234 struct batadv_priv *bat_priv;
236 delayed_work = container_of(work, struct delayed_work, work);
237 forw_packet = container_of(delayed_work, struct batadv_forw_packet,
239 soft_iface = forw_packet->if_incoming->soft_iface;
240 bat_priv = netdev_priv(soft_iface);
242 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
243 hlist_del(&forw_packet->list);
244 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
246 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
249 if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
252 /* rebroadcast packet */
254 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
255 if (hard_iface->soft_iface != soft_iface)
258 /* send a copy of the saved skb */
259 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
261 batadv_send_skb_packet(skb1, hard_iface,
262 batadv_broadcast_addr);
266 forw_packet->num_packets++;
268 /* if we still have some more bcasts to send */
269 if (forw_packet->num_packets < 3) {
270 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
271 msecs_to_jiffies(5));
276 batadv_forw_packet_free(forw_packet);
277 atomic_inc(&bat_priv->bcast_queue_left);
280 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
282 struct delayed_work *delayed_work;
283 struct batadv_forw_packet *forw_packet;
284 struct batadv_priv *bat_priv;
286 delayed_work = container_of(work, struct delayed_work, work);
287 forw_packet = container_of(delayed_work, struct batadv_forw_packet,
289 bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
290 spin_lock_bh(&bat_priv->forw_bat_list_lock);
291 hlist_del(&forw_packet->list);
292 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
294 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
297 bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
299 /* we have to have at least one packet in the queue
300 * to determine the queues wake up time unless we are
303 if (forw_packet->own)
304 batadv_schedule_bat_ogm(forw_packet->if_incoming);
307 /* don't count own packet */
308 if (!forw_packet->own)
309 atomic_inc(&bat_priv->batman_queue_left);
311 batadv_forw_packet_free(forw_packet);
315 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
316 const struct batadv_hard_iface *hard_iface)
318 struct batadv_forw_packet *forw_packet;
319 struct hlist_node *safe_tmp_node;
323 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
324 "purge_outstanding_packets(): %s\n",
325 hard_iface->net_dev->name);
327 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
328 "purge_outstanding_packets()\n");
330 /* free bcast list */
331 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
332 hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
333 &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, safe_tmp_node,
359 &bat_priv->forw_bat_list, list) {
360 /* if purge_outstanding_packets() was called with an argument
361 * we delete only packets belonging to the given interface
364 (forw_packet->if_incoming != hard_iface))
367 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
369 /* send_outstanding_bat_packet() will lock the list to
370 * delete the item from the list
372 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
373 spin_lock_bh(&bat_priv->forw_bat_list_lock);
376 hlist_del(&forw_packet->list);
377 batadv_forw_packet_free(forw_packet);
380 spin_unlock_bh(&bat_priv->forw_bat_list_lock);