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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ 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-3.16.77 ] ~ [ 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-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include "main.h"
 19 #include "distributed-arp-table.h"
 20 #include "send.h"
 21 #include "routing.h"
 22 #include "translation-table.h"
 23 #include "soft-interface.h"
 24 #include "hard-interface.h"
 25 #include "gateway_common.h"
 26 #include "gateway_client.h"
 27 #include "originator.h"
 28 #include "network-coding.h"
 29 #include "fragmentation.h"
 30 #include "multicast.h"
 31 
 32 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 33 
 34 /* send out an already prepared packet to the given address via the
 35  * specified batman interface
 36  */
 37 int batadv_send_skb_packet(struct sk_buff *skb,
 38                            struct batadv_hard_iface *hard_iface,
 39                            const uint8_t *dst_addr)
 40 {
 41         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 42         struct ethhdr *ethhdr;
 43 
 44         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 45                 goto send_skb_err;
 46 
 47         if (unlikely(!hard_iface->net_dev))
 48                 goto send_skb_err;
 49 
 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);
 53                 goto send_skb_err;
 54         }
 55 
 56         /* push to the ethernet header. */
 57         if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
 58                 goto send_skb_err;
 59 
 60         skb_reset_mac_header(skb);
 61 
 62         ethhdr = eth_hdr(skb);
 63         ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
 64         ether_addr_copy(ethhdr->h_dest, dst_addr);
 65         ethhdr->h_proto = htons(ETH_P_BATMAN);
 66 
 67         skb_set_network_header(skb, ETH_HLEN);
 68         skb->protocol = htons(ETH_P_BATMAN);
 69 
 70         skb->dev = hard_iface->net_dev;
 71 
 72         /* Save a clone of the skb to use when decoding coded packets */
 73         batadv_nc_skb_store_for_decoding(bat_priv, skb);
 74 
 75         /* dev_queue_xmit() returns a negative result on error.  However on
 76          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 77          * (which is > 0). This will not be treated as an error.
 78          */
 79         return dev_queue_xmit(skb);
 80 send_skb_err:
 81         kfree_skb(skb);
 82         return NET_XMIT_DROP;
 83 }
 84 
 85 /**
 86  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
 87  * @skb: Packet to be transmitted.
 88  * @orig_node: Final destination of the packet.
 89  * @recv_if: Interface used when receiving the packet (can be NULL).
 90  *
 91  * Looks up the best next-hop towards the passed originator and passes the
 92  * skb on for preparation of MAC header. If the packet originated from this
 93  * host, NULL can be passed as recv_if and no interface alternating is
 94  * attempted.
 95  *
 96  * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
 97  * NET_XMIT_POLICED if the skb is buffered for later transmit.
 98  */
 99 int batadv_send_skb_to_orig(struct sk_buff *skb,
100                             struct batadv_orig_node *orig_node,
101                             struct batadv_hard_iface *recv_if)
102 {
103         struct batadv_priv *bat_priv = orig_node->bat_priv;
104         struct batadv_neigh_node *neigh_node;
105         int ret = NET_XMIT_DROP;
106 
107         /* batadv_find_router() increases neigh_nodes refcount if found. */
108         neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
109         if (!neigh_node)
110                 goto out;
111 
112         /* Check if the skb is too large to send in one piece and fragment
113          * it if needed.
114          */
115         if (atomic_read(&bat_priv->fragmentation) &&
116             skb->len > neigh_node->if_incoming->net_dev->mtu) {
117                 /* Fragment and send packet. */
118                 if (batadv_frag_send_packet(skb, orig_node, neigh_node))
119                         ret = NET_XMIT_SUCCESS;
120 
121                 goto out;
122         }
123 
124         /* try to network code the packet, if it is received on an interface
125          * (i.e. being forwarded). If the packet originates from this node or if
126          * network coding fails, then send the packet as usual.
127          */
128         if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
129                 ret = NET_XMIT_POLICED;
130         } else {
131                 batadv_send_skb_packet(skb, neigh_node->if_incoming,
132                                        neigh_node->addr);
133                 ret = NET_XMIT_SUCCESS;
134         }
135 
136 out:
137         if (neigh_node)
138                 batadv_neigh_node_free_ref(neigh_node);
139 
140         return ret;
141 }
142 
143 /**
144  * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
145  *  common fields for unicast packets
146  * @skb: the skb carrying the unicast header to initialize
147  * @hdr_size: amount of bytes to push at the beginning of the skb
148  * @orig_node: the destination node
149  *
150  * Returns false if the buffer extension was not possible or true otherwise.
151  */
152 static bool
153 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
154                                   struct batadv_orig_node *orig_node)
155 {
156         struct batadv_unicast_packet *unicast_packet;
157         uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
158 
159         if (batadv_skb_head_push(skb, hdr_size) < 0)
160                 return false;
161 
162         unicast_packet = (struct batadv_unicast_packet *)skb->data;
163         unicast_packet->version = BATADV_COMPAT_VERSION;
164         /* batman packet type: unicast */
165         unicast_packet->packet_type = BATADV_UNICAST;
166         /* set unicast ttl */
167         unicast_packet->ttl = BATADV_TTL;
168         /* copy the destination for faster routing */
169         ether_addr_copy(unicast_packet->dest, orig_node->orig);
170         /* set the destination tt version number */
171         unicast_packet->ttvn = ttvn;
172 
173         return true;
174 }
175 
176 /**
177  * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
178  * @skb: the skb containing the payload to encapsulate
179  * @orig_node: the destination node
180  *
181  * Returns false if the payload could not be encapsulated or true otherwise.
182  */
183 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
184                                             struct batadv_orig_node *orig_node)
185 {
186         size_t uni_size = sizeof(struct batadv_unicast_packet);
187 
188         return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
189 }
190 
191 /**
192  * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
193  *  unicast 4addr header
194  * @bat_priv: the bat priv with all the soft interface information
195  * @skb: the skb containing the payload to encapsulate
196  * @orig_node: the destination node
197  * @packet_subtype: the unicast 4addr packet subtype to use
198  *
199  * Returns false if the payload could not be encapsulated or true otherwise.
200  */
201 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
202                                            struct sk_buff *skb,
203                                            struct batadv_orig_node *orig,
204                                            int packet_subtype)
205 {
206         struct batadv_hard_iface *primary_if;
207         struct batadv_unicast_4addr_packet *uc_4addr_packet;
208         bool ret = false;
209 
210         primary_if = batadv_primary_if_get_selected(bat_priv);
211         if (!primary_if)
212                 goto out;
213 
214         /* Pull the header space and fill the unicast_packet substructure.
215          * We can do that because the first member of the uc_4addr_packet
216          * is of type struct unicast_packet
217          */
218         if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
219                                                orig))
220                 goto out;
221 
222         uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
223         uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
224         ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
225         uc_4addr_packet->subtype = packet_subtype;
226         uc_4addr_packet->reserved = 0;
227 
228         ret = true;
229 out:
230         if (primary_if)
231                 batadv_hardif_free_ref(primary_if);
232         return ret;
233 }
234 
235 /**
236  * batadv_send_skb_unicast - encapsulate and send an skb via unicast
237  * @bat_priv: the bat priv with all the soft interface information
238  * @skb: payload to send
239  * @packet_type: the batman unicast packet type to use
240  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
241  *  4addr packets)
242  * @orig_node: the originator to send the packet to
243  * @vid: the vid to be used to search the translation table
244  *
245  * Wrap the given skb into a batman-adv unicast or unicast-4addr header
246  * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
247  * as packet_type. Then send this frame to the given orig_node and release a
248  * reference to this orig_node.
249  *
250  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
251  */
252 int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
253                             struct sk_buff *skb, int packet_type,
254                             int packet_subtype,
255                             struct batadv_orig_node *orig_node,
256                             unsigned short vid)
257 {
258         struct ethhdr *ethhdr;
259         struct batadv_unicast_packet *unicast_packet;
260         int ret = NET_XMIT_DROP;
261 
262         if (!orig_node)
263                 goto out;
264 
265         switch (packet_type) {
266         case BATADV_UNICAST:
267                 if (!batadv_send_skb_prepare_unicast(skb, orig_node))
268                         goto out;
269                 break;
270         case BATADV_UNICAST_4ADDR:
271                 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
272                                                            orig_node,
273                                                            packet_subtype))
274                         goto out;
275                 break;
276         default:
277                 /* this function supports UNICAST and UNICAST_4ADDR only. It
278                  * should never be invoked with any other packet type
279                  */
280                 goto out;
281         }
282 
283         /* skb->data might have been reallocated by
284          * batadv_send_skb_prepare_unicast{,_4addr}()
285          */
286         ethhdr = eth_hdr(skb);
287         unicast_packet = (struct batadv_unicast_packet *)skb->data;
288 
289         /* inform the destination node that we are still missing a correct route
290          * for this client. The destination will receive this packet and will
291          * try to reroute it because the ttvn contained in the header is less
292          * than the current one
293          */
294         if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
295                 unicast_packet->ttvn = unicast_packet->ttvn - 1;
296 
297         if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
298                 ret = NET_XMIT_SUCCESS;
299 
300 out:
301         if (orig_node)
302                 batadv_orig_node_free_ref(orig_node);
303         if (ret == NET_XMIT_DROP)
304                 kfree_skb(skb);
305         return ret;
306 }
307 
308 /**
309  * batadv_send_skb_via_tt_generic - send an skb via TT lookup
310  * @bat_priv: the bat priv with all the soft interface information
311  * @skb: payload to send
312  * @packet_type: the batman unicast packet type to use
313  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
314  *  4addr packets)
315  * @dst_hint: can be used to override the destination contained in the skb
316  * @vid: the vid to be used to search the translation table
317  *
318  * Look up the recipient node for the destination address in the ethernet
319  * header via the translation table. Wrap the given skb into a batman-adv
320  * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
321  * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
322  * to the according destination node.
323  *
324  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
325  */
326 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
327                                    struct sk_buff *skb, int packet_type,
328                                    int packet_subtype, uint8_t *dst_hint,
329                                    unsigned short vid)
330 {
331         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
332         struct batadv_orig_node *orig_node;
333         uint8_t *src, *dst;
334 
335         src = ethhdr->h_source;
336         dst = ethhdr->h_dest;
337 
338         /* if we got an hint! let's send the packet to this client (if any) */
339         if (dst_hint) {
340                 src = NULL;
341                 dst = dst_hint;
342         }
343         orig_node = batadv_transtable_search(bat_priv, src, dst, vid);
344 
345         return batadv_send_skb_unicast(bat_priv, skb, packet_type,
346                                        packet_subtype, orig_node, vid);
347 }
348 
349 /**
350  * batadv_send_skb_via_gw - send an skb via gateway lookup
351  * @bat_priv: the bat priv with all the soft interface information
352  * @skb: payload to send
353  * @vid: the vid to be used to search the translation table
354  *
355  * Look up the currently selected gateway. Wrap the given skb into a batman-adv
356  * unicast header and send this frame to this gateway node.
357  *
358  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
359  */
360 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
361                            unsigned short vid)
362 {
363         struct batadv_orig_node *orig_node;
364 
365         orig_node = batadv_gw_get_selected_orig(bat_priv);
366         return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
367                                        orig_node, vid);
368 }
369 
370 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
371 {
372         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
373 
374         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
375             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
376                 return;
377 
378         /* the interface gets activated here to avoid race conditions between
379          * the moment of activating the interface in
380          * hardif_activate_interface() where the originator mac is set and
381          * outdated packets (especially uninitialized mac addresses) in the
382          * packet queue
383          */
384         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
385                 hard_iface->if_status = BATADV_IF_ACTIVE;
386 
387         bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
388 }
389 
390 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
391 {
392         if (forw_packet->skb)
393                 kfree_skb(forw_packet->skb);
394         if (forw_packet->if_incoming)
395                 batadv_hardif_free_ref(forw_packet->if_incoming);
396         if (forw_packet->if_outgoing)
397                 batadv_hardif_free_ref(forw_packet->if_outgoing);
398         kfree(forw_packet);
399 }
400 
401 static void
402 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
403                                  struct batadv_forw_packet *forw_packet,
404                                  unsigned long send_time)
405 {
406         /* add new packet to packet list */
407         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
408         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
409         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
410 
411         /* start timer for this packet */
412         queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
413                            send_time);
414 }
415 
416 /* add a broadcast packet to the queue and setup timers. broadcast packets
417  * are sent multiple times to increase probability for being received.
418  *
419  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
420  * errors.
421  *
422  * The skb is not consumed, so the caller should make sure that the
423  * skb is freed.
424  */
425 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
426                                     const struct sk_buff *skb,
427                                     unsigned long delay)
428 {
429         struct batadv_hard_iface *primary_if = NULL;
430         struct batadv_forw_packet *forw_packet;
431         struct batadv_bcast_packet *bcast_packet;
432         struct sk_buff *newskb;
433 
434         if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
435                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
436                            "bcast packet queue full\n");
437                 goto out;
438         }
439 
440         primary_if = batadv_primary_if_get_selected(bat_priv);
441         if (!primary_if)
442                 goto out_and_inc;
443 
444         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
445 
446         if (!forw_packet)
447                 goto out_and_inc;
448 
449         newskb = skb_copy(skb, GFP_ATOMIC);
450         if (!newskb)
451                 goto packet_free;
452 
453         /* as we have a copy now, it is safe to decrease the TTL */
454         bcast_packet = (struct batadv_bcast_packet *)newskb->data;
455         bcast_packet->ttl--;
456 
457         skb_reset_mac_header(newskb);
458 
459         forw_packet->skb = newskb;
460         forw_packet->if_incoming = primary_if;
461         forw_packet->if_outgoing = NULL;
462 
463         /* how often did we send the bcast packet ? */
464         forw_packet->num_packets = 0;
465 
466         INIT_DELAYED_WORK(&forw_packet->delayed_work,
467                           batadv_send_outstanding_bcast_packet);
468 
469         _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
470         return NETDEV_TX_OK;
471 
472 packet_free:
473         kfree(forw_packet);
474 out_and_inc:
475         atomic_inc(&bat_priv->bcast_queue_left);
476 out:
477         if (primary_if)
478                 batadv_hardif_free_ref(primary_if);
479         return NETDEV_TX_BUSY;
480 }
481 
482 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
483 {
484         struct batadv_hard_iface *hard_iface;
485         struct delayed_work *delayed_work;
486         struct batadv_forw_packet *forw_packet;
487         struct sk_buff *skb1;
488         struct net_device *soft_iface;
489         struct batadv_priv *bat_priv;
490 
491         delayed_work = container_of(work, struct delayed_work, work);
492         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
493                                    delayed_work);
494         soft_iface = forw_packet->if_incoming->soft_iface;
495         bat_priv = netdev_priv(soft_iface);
496 
497         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
498         hlist_del(&forw_packet->list);
499         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
500 
501         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
502                 goto out;
503 
504         if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
505                 goto out;
506 
507         /* rebroadcast packet */
508         rcu_read_lock();
509         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
510                 if (hard_iface->soft_iface != soft_iface)
511                         continue;
512 
513                 if (forw_packet->num_packets >= hard_iface->num_bcasts)
514                         continue;
515 
516                 /* send a copy of the saved skb */
517                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
518                 if (skb1)
519                         batadv_send_skb_packet(skb1, hard_iface,
520                                                batadv_broadcast_addr);
521         }
522         rcu_read_unlock();
523 
524         forw_packet->num_packets++;
525 
526         /* if we still have some more bcasts to send */
527         if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
528                 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
529                                                  msecs_to_jiffies(5));
530                 return;
531         }
532 
533 out:
534         batadv_forw_packet_free(forw_packet);
535         atomic_inc(&bat_priv->bcast_queue_left);
536 }
537 
538 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
539 {
540         struct delayed_work *delayed_work;
541         struct batadv_forw_packet *forw_packet;
542         struct batadv_priv *bat_priv;
543 
544         delayed_work = container_of(work, struct delayed_work, work);
545         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
546                                    delayed_work);
547         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
548         spin_lock_bh(&bat_priv->forw_bat_list_lock);
549         hlist_del(&forw_packet->list);
550         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
551 
552         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
553                 goto out;
554 
555         bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
556 
557         /* we have to have at least one packet in the queue to determine the
558          * queues wake up time unless we are shutting down.
559          *
560          * only re-schedule if this is the "original" copy, e.g. the OGM of the
561          * primary interface should only be rescheduled once per period, but
562          * this function will be called for the forw_packet instances of the
563          * other secondary interfaces as well.
564          */
565         if (forw_packet->own &&
566             forw_packet->if_incoming == forw_packet->if_outgoing)
567                 batadv_schedule_bat_ogm(forw_packet->if_incoming);
568 
569 out:
570         /* don't count own packet */
571         if (!forw_packet->own)
572                 atomic_inc(&bat_priv->batman_queue_left);
573 
574         batadv_forw_packet_free(forw_packet);
575 }
576 
577 void
578 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
579                                  const struct batadv_hard_iface *hard_iface)
580 {
581         struct batadv_forw_packet *forw_packet;
582         struct hlist_node *safe_tmp_node;
583         bool pending;
584 
585         if (hard_iface)
586                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
587                            "purge_outstanding_packets(): %s\n",
588                            hard_iface->net_dev->name);
589         else
590                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
591                            "purge_outstanding_packets()\n");
592 
593         /* free bcast list */
594         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
595         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
596                                   &bat_priv->forw_bcast_list, list) {
597                 /* if purge_outstanding_packets() was called with an argument
598                  * we delete only packets belonging to the given interface
599                  */
600                 if ((hard_iface) &&
601                     (forw_packet->if_incoming != hard_iface))
602                         continue;
603 
604                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
605 
606                 /* batadv_send_outstanding_bcast_packet() will lock the list to
607                  * delete the item from the list
608                  */
609                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
610                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
611 
612                 if (pending) {
613                         hlist_del(&forw_packet->list);
614                         if (!forw_packet->own)
615                                 atomic_inc(&bat_priv->bcast_queue_left);
616 
617                         batadv_forw_packet_free(forw_packet);
618                 }
619         }
620         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
621 
622         /* free batman packet list */
623         spin_lock_bh(&bat_priv->forw_bat_list_lock);
624         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
625                                   &bat_priv->forw_bat_list, list) {
626                 /* if purge_outstanding_packets() was called with an argument
627                  * we delete only packets belonging to the given interface
628                  */
629                 if ((hard_iface) &&
630                     (forw_packet->if_incoming != hard_iface) &&
631                     (forw_packet->if_outgoing != hard_iface))
632                         continue;
633 
634                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
635 
636                 /* send_outstanding_bat_packet() will lock the list to
637                  * delete the item from the list
638                  */
639                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
640                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
641 
642                 if (pending) {
643                         hlist_del(&forw_packet->list);
644                         if (!forw_packet->own)
645                                 atomic_inc(&bat_priv->batman_queue_left);
646 
647                         batadv_forw_packet_free(forw_packet);
648                 }
649         }
650         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
651 }
652 

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