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TOMOYO Linux Cross Reference
Linux/net/batman-adv/send.c

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
  2  *
  3  * Marek Lindner, Simon Wunderlich
  4  *
  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.
  8  *
  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.
 13  *
 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
 17  * 02110-1301, USA
 18  */
 19 
 20 #include "main.h"
 21 #include "distributed-arp-table.h"
 22 #include "send.h"
 23 #include "routing.h"
 24 #include "translation-table.h"
 25 #include "soft-interface.h"
 26 #include "hard-interface.h"
 27 #include "gateway_common.h"
 28 #include "gateway_client.h"
 29 #include "originator.h"
 30 #include "network-coding.h"
 31 #include "fragmentation.h"
 32 
 33 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 34 
 35 /* send out an already prepared packet to the given address via the
 36  * specified batman interface
 37  */
 38 int batadv_send_skb_packet(struct sk_buff *skb,
 39                            struct batadv_hard_iface *hard_iface,
 40                            const uint8_t *dst_addr)
 41 {
 42         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 43         struct ethhdr *ethhdr;
 44 
 45         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 46                 goto send_skb_err;
 47 
 48         if (unlikely(!hard_iface->net_dev))
 49                 goto send_skb_err;
 50 
 51         if (!(hard_iface->net_dev->flags & IFF_UP)) {
 52                 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
 53                         hard_iface->net_dev->name);
 54                 goto send_skb_err;
 55         }
 56 
 57         /* push to the ethernet header. */
 58         if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
 59                 goto send_skb_err;
 60 
 61         skb_reset_mac_header(skb);
 62 
 63         ethhdr = eth_hdr(skb);
 64         memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
 65         memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
 66         ethhdr->h_proto = htons(ETH_P_BATMAN);
 67 
 68         skb_set_network_header(skb, ETH_HLEN);
 69         skb->protocol = htons(ETH_P_BATMAN);
 70 
 71         skb->dev = hard_iface->net_dev;
 72 
 73         /* Save a clone of the skb to use when decoding coded packets */
 74         batadv_nc_skb_store_for_decoding(bat_priv, skb);
 75 
 76         /* dev_queue_xmit() returns a negative result on error.  However on
 77          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 78          * (which is > 0). This will not be treated as an error.
 79          */
 80         return dev_queue_xmit(skb);
 81 send_skb_err:
 82         kfree_skb(skb);
 83         return NET_XMIT_DROP;
 84 }
 85 
 86 /**
 87  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
 88  * @skb: Packet to be transmitted.
 89  * @orig_node: Final destination of the packet.
 90  * @recv_if: Interface used when receiving the packet (can be NULL).
 91  *
 92  * Looks up the best next-hop towards the passed originator and passes the
 93  * skb on for preparation of MAC header. If the packet originated from this
 94  * host, NULL can be passed as recv_if and no interface alternating is
 95  * attempted.
 96  *
 97  * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
 98  * NET_XMIT_POLICED if the skb is buffered for later transmit.
 99  */
100 int batadv_send_skb_to_orig(struct sk_buff *skb,
101                             struct batadv_orig_node *orig_node,
102                             struct batadv_hard_iface *recv_if)
103 {
104         struct batadv_priv *bat_priv = orig_node->bat_priv;
105         struct batadv_neigh_node *neigh_node;
106         int ret = NET_XMIT_DROP;
107 
108         /* batadv_find_router() increases neigh_nodes refcount if found. */
109         neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
110         if (!neigh_node)
111                 goto out;
112 
113         /* Check if the skb is too large to send in one piece and fragment
114          * it if needed.
115          */
116         if (atomic_read(&bat_priv->fragmentation) &&
117             skb->len > neigh_node->if_incoming->net_dev->mtu) {
118                 /* Fragment and send packet. */
119                 if (batadv_frag_send_packet(skb, orig_node, neigh_node))
120                         ret = NET_XMIT_SUCCESS;
121 
122                 goto out;
123         }
124 
125         /* try to network code the packet, if it is received on an interface
126          * (i.e. being forwarded). If the packet originates from this node or if
127          * network coding fails, then send the packet as usual.
128          */
129         if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
130                 ret = NET_XMIT_POLICED;
131         } else {
132                 batadv_send_skb_packet(skb, neigh_node->if_incoming,
133                                        neigh_node->addr);
134                 ret = NET_XMIT_SUCCESS;
135         }
136 
137 out:
138         if (neigh_node)
139                 batadv_neigh_node_free_ref(neigh_node);
140 
141         return ret;
142 }
143 
144 /**
145  * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
146  *  common fields for unicast packets
147  * @skb: the skb carrying the unicast header to initialize
148  * @hdr_size: amount of bytes to push at the beginning of the skb
149  * @orig_node: the destination node
150  *
151  * Returns false if the buffer extension was not possible or true otherwise.
152  */
153 static bool
154 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
155                                   struct batadv_orig_node *orig_node)
156 {
157         struct batadv_unicast_packet *unicast_packet;
158         uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
159 
160         if (batadv_skb_head_push(skb, hdr_size) < 0)
161                 return false;
162 
163         unicast_packet = (struct batadv_unicast_packet *)skb->data;
164         unicast_packet->version = BATADV_COMPAT_VERSION;
165         /* batman packet type: unicast */
166         unicast_packet->packet_type = BATADV_UNICAST;
167         /* set unicast ttl */
168         unicast_packet->ttl = BATADV_TTL;
169         /* copy the destination for faster routing */
170         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
171         /* set the destination tt version number */
172         unicast_packet->ttvn = ttvn;
173 
174         return true;
175 }
176 
177 /**
178  * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
179  * @skb: the skb containing the payload to encapsulate
180  * @orig_node: the destination node
181  *
182  * Returns false if the payload could not be encapsulated or true otherwise.
183  */
184 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
185                                             struct batadv_orig_node *orig_node)
186 {
187         size_t uni_size = sizeof(struct batadv_unicast_packet);
188 
189         return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
190 }
191 
192 /**
193  * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
194  *  unicast 4addr header
195  * @bat_priv: the bat priv with all the soft interface information
196  * @skb: the skb containing the payload to encapsulate
197  * @orig_node: the destination node
198  * @packet_subtype: the unicast 4addr packet subtype to use
199  *
200  * Returns false if the payload could not be encapsulated or true otherwise.
201  */
202 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
203                                            struct sk_buff *skb,
204                                            struct batadv_orig_node *orig,
205                                            int packet_subtype)
206 {
207         struct batadv_hard_iface *primary_if;
208         struct batadv_unicast_4addr_packet *uc_4addr_packet;
209         bool ret = false;
210 
211         primary_if = batadv_primary_if_get_selected(bat_priv);
212         if (!primary_if)
213                 goto out;
214 
215         /* Pull the header space and fill the unicast_packet substructure.
216          * We can do that because the first member of the uc_4addr_packet
217          * is of type struct unicast_packet
218          */
219         if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
220                                                orig))
221                 goto out;
222 
223         uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
224         uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
225         memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
226         uc_4addr_packet->subtype = packet_subtype;
227         uc_4addr_packet->reserved = 0;
228 
229         ret = true;
230 out:
231         if (primary_if)
232                 batadv_hardif_free_ref(primary_if);
233         return ret;
234 }
235 
236 /**
237  * batadv_send_skb_unicast - encapsulate and send an skb via unicast
238  * @bat_priv: the bat priv with all the soft interface information
239  * @skb: payload to send
240  * @packet_type: the batman unicast packet type to use
241  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
242  *  4addr packets)
243  * @orig_node: the originator to send the packet to
244  * @vid: the vid to be used to search the translation table
245  *
246  * Wrap the given skb into a batman-adv unicast or unicast-4addr header
247  * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
248  * as packet_type. Then send this frame to the given orig_node and release a
249  * reference to this orig_node.
250  *
251  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
252  */
253 static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
254                                    struct sk_buff *skb, int packet_type,
255                                    int packet_subtype,
256                                    struct batadv_orig_node *orig_node,
257                                    unsigned short vid)
258 {
259         struct ethhdr *ethhdr;
260         struct batadv_unicast_packet *unicast_packet;
261         int ret = NET_XMIT_DROP, hdr_size;
262 
263         if (!orig_node)
264                 goto out;
265 
266         switch (packet_type) {
267         case BATADV_UNICAST:
268                 if (!batadv_send_skb_prepare_unicast(skb, orig_node))
269                         goto out;
270 
271                 hdr_size = sizeof(*unicast_packet);
272                 break;
273         case BATADV_UNICAST_4ADDR:
274                 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
275                                                            orig_node,
276                                                            packet_subtype))
277                         goto out;
278 
279                 hdr_size = sizeof(struct batadv_unicast_4addr_packet);
280                 break;
281         default:
282                 /* this function supports UNICAST and UNICAST_4ADDR only. It
283                  * should never be invoked with any other packet type
284                  */
285                 goto out;
286         }
287 
288         ethhdr = (struct ethhdr *)(skb->data + hdr_size);
289         unicast_packet = (struct batadv_unicast_packet *)skb->data;
290 
291         /* inform the destination node that we are still missing a correct route
292          * for this client. The destination will receive this packet and will
293          * try to reroute it because the ttvn contained in the header is less
294          * than the current one
295          */
296         if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
297                 unicast_packet->ttvn = unicast_packet->ttvn - 1;
298 
299         if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
300                 ret = NET_XMIT_SUCCESS;
301 
302 out:
303         if (orig_node)
304                 batadv_orig_node_free_ref(orig_node);
305         if (ret == NET_XMIT_DROP)
306                 kfree_skb(skb);
307         return ret;
308 }
309 
310 /**
311  * batadv_send_skb_via_tt_generic - send an skb via TT lookup
312  * @bat_priv: the bat priv with all the soft interface information
313  * @skb: payload to send
314  * @packet_type: the batman unicast packet type to use
315  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
316  *  4addr packets)
317  * @vid: the vid to be used to search the translation table
318  *
319  * Look up the recipient node for the destination address in the ethernet
320  * header via the translation table. Wrap the given skb into a batman-adv
321  * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
322  * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
323  * to the according destination node.
324  *
325  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
326  */
327 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
328                                    struct sk_buff *skb, int packet_type,
329                                    int packet_subtype, unsigned short vid)
330 {
331         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
332         struct batadv_orig_node *orig_node;
333 
334         orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
335                                              ethhdr->h_dest, vid);
336         return batadv_send_skb_unicast(bat_priv, skb, packet_type,
337                                        packet_subtype, orig_node, vid);
338 }
339 
340 /**
341  * batadv_send_skb_via_gw - send an skb via gateway lookup
342  * @bat_priv: the bat priv with all the soft interface information
343  * @skb: payload to send
344  * @vid: the vid to be used to search the translation table
345  *
346  * Look up the currently selected gateway. Wrap the given skb into a batman-adv
347  * unicast header and send this frame to this gateway node.
348  *
349  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
350  */
351 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
352                            unsigned short vid)
353 {
354         struct batadv_orig_node *orig_node;
355 
356         orig_node = batadv_gw_get_selected_orig(bat_priv);
357         return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
358                                        orig_node, vid);
359 }
360 
361 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
362 {
363         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
364 
365         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
366             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
367                 return;
368 
369         /* the interface gets activated here to avoid race conditions between
370          * the moment of activating the interface in
371          * hardif_activate_interface() where the originator mac is set and
372          * outdated packets (especially uninitialized mac addresses) in the
373          * packet queue
374          */
375         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
376                 hard_iface->if_status = BATADV_IF_ACTIVE;
377 
378         bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
379 }
380 
381 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
382 {
383         if (forw_packet->skb)
384                 kfree_skb(forw_packet->skb);
385         if (forw_packet->if_incoming)
386                 batadv_hardif_free_ref(forw_packet->if_incoming);
387         kfree(forw_packet);
388 }
389 
390 static void
391 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
392                                  struct batadv_forw_packet *forw_packet,
393                                  unsigned long send_time)
394 {
395         /* add new packet to packet list */
396         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
397         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
398         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
399 
400         /* start timer for this packet */
401         queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
402                            send_time);
403 }
404 
405 /* add a broadcast packet to the queue and setup timers. broadcast packets
406  * are sent multiple times to increase probability for being received.
407  *
408  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
409  * errors.
410  *
411  * The skb is not consumed, so the caller should make sure that the
412  * skb is freed.
413  */
414 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
415                                     const struct sk_buff *skb,
416                                     unsigned long delay)
417 {
418         struct batadv_hard_iface *primary_if = NULL;
419         struct batadv_forw_packet *forw_packet;
420         struct batadv_bcast_packet *bcast_packet;
421         struct sk_buff *newskb;
422 
423         if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
424                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
425                            "bcast packet queue full\n");
426                 goto out;
427         }
428 
429         primary_if = batadv_primary_if_get_selected(bat_priv);
430         if (!primary_if)
431                 goto out_and_inc;
432 
433         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
434 
435         if (!forw_packet)
436                 goto out_and_inc;
437 
438         newskb = skb_copy(skb, GFP_ATOMIC);
439         if (!newskb)
440                 goto packet_free;
441 
442         /* as we have a copy now, it is safe to decrease the TTL */
443         bcast_packet = (struct batadv_bcast_packet *)newskb->data;
444         bcast_packet->ttl--;
445 
446         skb_reset_mac_header(newskb);
447 
448         forw_packet->skb = newskb;
449         forw_packet->if_incoming = primary_if;
450 
451         /* how often did we send the bcast packet ? */
452         forw_packet->num_packets = 0;
453 
454         INIT_DELAYED_WORK(&forw_packet->delayed_work,
455                           batadv_send_outstanding_bcast_packet);
456 
457         _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
458         return NETDEV_TX_OK;
459 
460 packet_free:
461         kfree(forw_packet);
462 out_and_inc:
463         atomic_inc(&bat_priv->bcast_queue_left);
464 out:
465         if (primary_if)
466                 batadv_hardif_free_ref(primary_if);
467         return NETDEV_TX_BUSY;
468 }
469 
470 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
471 {
472         struct batadv_hard_iface *hard_iface;
473         struct delayed_work *delayed_work;
474         struct batadv_forw_packet *forw_packet;
475         struct sk_buff *skb1;
476         struct net_device *soft_iface;
477         struct batadv_priv *bat_priv;
478 
479         delayed_work = container_of(work, struct delayed_work, work);
480         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
481                                    delayed_work);
482         soft_iface = forw_packet->if_incoming->soft_iface;
483         bat_priv = netdev_priv(soft_iface);
484 
485         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
486         hlist_del(&forw_packet->list);
487         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
488 
489         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
490                 goto out;
491 
492         if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
493                 goto out;
494 
495         /* rebroadcast packet */
496         rcu_read_lock();
497         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
498                 if (hard_iface->soft_iface != soft_iface)
499                         continue;
500 
501                 if (forw_packet->num_packets >= hard_iface->num_bcasts)
502                         continue;
503 
504                 /* send a copy of the saved skb */
505                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
506                 if (skb1)
507                         batadv_send_skb_packet(skb1, hard_iface,
508                                                batadv_broadcast_addr);
509         }
510         rcu_read_unlock();
511 
512         forw_packet->num_packets++;
513 
514         /* if we still have some more bcasts to send */
515         if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
516                 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
517                                                  msecs_to_jiffies(5));
518                 return;
519         }
520 
521 out:
522         batadv_forw_packet_free(forw_packet);
523         atomic_inc(&bat_priv->bcast_queue_left);
524 }
525 
526 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
527 {
528         struct delayed_work *delayed_work;
529         struct batadv_forw_packet *forw_packet;
530         struct batadv_priv *bat_priv;
531 
532         delayed_work = container_of(work, struct delayed_work, work);
533         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
534                                    delayed_work);
535         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
536         spin_lock_bh(&bat_priv->forw_bat_list_lock);
537         hlist_del(&forw_packet->list);
538         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
539 
540         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
541                 goto out;
542 
543         bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
544 
545         /* we have to have at least one packet in the queue
546          * to determine the queues wake up time unless we are
547          * shutting down
548          */
549         if (forw_packet->own)
550                 batadv_schedule_bat_ogm(forw_packet->if_incoming);
551 
552 out:
553         /* don't count own packet */
554         if (!forw_packet->own)
555                 atomic_inc(&bat_priv->batman_queue_left);
556 
557         batadv_forw_packet_free(forw_packet);
558 }
559 
560 void
561 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
562                                  const struct batadv_hard_iface *hard_iface)
563 {
564         struct batadv_forw_packet *forw_packet;
565         struct hlist_node *safe_tmp_node;
566         bool pending;
567 
568         if (hard_iface)
569                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
570                            "purge_outstanding_packets(): %s\n",
571                            hard_iface->net_dev->name);
572         else
573                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
574                            "purge_outstanding_packets()\n");
575 
576         /* free bcast list */
577         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
578         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
579                                   &bat_priv->forw_bcast_list, list) {
580                 /* if purge_outstanding_packets() was called with an argument
581                  * we delete only packets belonging to the given interface
582                  */
583                 if ((hard_iface) &&
584                     (forw_packet->if_incoming != hard_iface))
585                         continue;
586 
587                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
588 
589                 /* batadv_send_outstanding_bcast_packet() will lock the list to
590                  * delete the item from the list
591                  */
592                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
593                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
594 
595                 if (pending) {
596                         hlist_del(&forw_packet->list);
597                         batadv_forw_packet_free(forw_packet);
598                 }
599         }
600         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
601 
602         /* free batman packet list */
603         spin_lock_bh(&bat_priv->forw_bat_list_lock);
604         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
605                                   &bat_priv->forw_bat_list, list) {
606                 /* if purge_outstanding_packets() was called with an argument
607                  * we delete only packets belonging to the given interface
608                  */
609                 if ((hard_iface) &&
610                     (forw_packet->if_incoming != hard_iface))
611                         continue;
612 
613                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
614 
615                 /* send_outstanding_bat_packet() will lock the list to
616                  * delete the item from the list
617                  */
618                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
619                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
620 
621                 if (pending) {
622                         hlist_del(&forw_packet->list);
623                         batadv_forw_packet_free(forw_packet);
624                 }
625         }
626         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
627 }
628 

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