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

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ 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-3.16.72 ] ~ [ 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) 2007-2015 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 "send.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/byteorder/generic.h>
 23 #include <linux/etherdevice.h>
 24 #include <linux/fs.h>
 25 #include <linux/if_ether.h>
 26 #include <linux/if.h>
 27 #include <linux/jiffies.h>
 28 #include <linux/kernel.h>
 29 #include <linux/list.h>
 30 #include <linux/netdevice.h>
 31 #include <linux/printk.h>
 32 #include <linux/rculist.h>
 33 #include <linux/rcupdate.h>
 34 #include <linux/skbuff.h>
 35 #include <linux/slab.h>
 36 #include <linux/spinlock.h>
 37 #include <linux/stddef.h>
 38 #include <linux/workqueue.h>
 39 
 40 #include "distributed-arp-table.h"
 41 #include "fragmentation.h"
 42 #include "gateway_client.h"
 43 #include "hard-interface.h"
 44 #include "network-coding.h"
 45 #include "originator.h"
 46 #include "routing.h"
 47 #include "soft-interface.h"
 48 #include "translation-table.h"
 49 
 50 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 51 
 52 /* send out an already prepared packet to the given address via the
 53  * specified batman interface
 54  */
 55 int batadv_send_skb_packet(struct sk_buff *skb,
 56                            struct batadv_hard_iface *hard_iface,
 57                            const uint8_t *dst_addr)
 58 {
 59         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 60         struct ethhdr *ethhdr;
 61 
 62         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 63                 goto send_skb_err;
 64 
 65         if (unlikely(!hard_iface->net_dev))
 66                 goto send_skb_err;
 67 
 68         if (!(hard_iface->net_dev->flags & IFF_UP)) {
 69                 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
 70                         hard_iface->net_dev->name);
 71                 goto send_skb_err;
 72         }
 73 
 74         /* push to the ethernet header. */
 75         if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
 76                 goto send_skb_err;
 77 
 78         skb_reset_mac_header(skb);
 79 
 80         ethhdr = eth_hdr(skb);
 81         ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
 82         ether_addr_copy(ethhdr->h_dest, dst_addr);
 83         ethhdr->h_proto = htons(ETH_P_BATMAN);
 84 
 85         skb_set_network_header(skb, ETH_HLEN);
 86         skb->protocol = htons(ETH_P_BATMAN);
 87 
 88         skb->dev = hard_iface->net_dev;
 89 
 90         /* Save a clone of the skb to use when decoding coded packets */
 91         batadv_nc_skb_store_for_decoding(bat_priv, skb);
 92 
 93         /* dev_queue_xmit() returns a negative result on error.  However on
 94          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 95          * (which is > 0). This will not be treated as an error.
 96          */
 97         return dev_queue_xmit(skb);
 98 send_skb_err:
 99         kfree_skb(skb);
100         return NET_XMIT_DROP;
101 }
102 
103 /**
104  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
105  * @skb: Packet to be transmitted.
106  * @orig_node: Final destination of the packet.
107  * @recv_if: Interface used when receiving the packet (can be NULL).
108  *
109  * Looks up the best next-hop towards the passed originator and passes the
110  * skb on for preparation of MAC header. If the packet originated from this
111  * host, NULL can be passed as recv_if and no interface alternating is
112  * attempted.
113  *
114  * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
115  * NET_XMIT_POLICED if the skb is buffered for later transmit.
116  */
117 int batadv_send_skb_to_orig(struct sk_buff *skb,
118                             struct batadv_orig_node *orig_node,
119                             struct batadv_hard_iface *recv_if)
120 {
121         struct batadv_priv *bat_priv = orig_node->bat_priv;
122         struct batadv_neigh_node *neigh_node;
123         int ret = NET_XMIT_DROP;
124 
125         /* batadv_find_router() increases neigh_nodes refcount if found. */
126         neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
127         if (!neigh_node)
128                 goto out;
129 
130         /* Check if the skb is too large to send in one piece and fragment
131          * it if needed.
132          */
133         if (atomic_read(&bat_priv->fragmentation) &&
134             skb->len > neigh_node->if_incoming->net_dev->mtu) {
135                 /* Fragment and send packet. */
136                 if (batadv_frag_send_packet(skb, orig_node, neigh_node))
137                         ret = NET_XMIT_SUCCESS;
138 
139                 goto out;
140         }
141 
142         /* try to network code the packet, if it is received on an interface
143          * (i.e. being forwarded). If the packet originates from this node or if
144          * network coding fails, then send the packet as usual.
145          */
146         if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
147                 ret = NET_XMIT_POLICED;
148         } else {
149                 batadv_send_skb_packet(skb, neigh_node->if_incoming,
150                                        neigh_node->addr);
151                 ret = NET_XMIT_SUCCESS;
152         }
153 
154 out:
155         if (neigh_node)
156                 batadv_neigh_node_free_ref(neigh_node);
157 
158         return ret;
159 }
160 
161 /**
162  * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
163  *  common fields for unicast packets
164  * @skb: the skb carrying the unicast header to initialize
165  * @hdr_size: amount of bytes to push at the beginning of the skb
166  * @orig_node: the destination node
167  *
168  * Returns false if the buffer extension was not possible or true otherwise.
169  */
170 static bool
171 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
172                                   struct batadv_orig_node *orig_node)
173 {
174         struct batadv_unicast_packet *unicast_packet;
175         uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
176 
177         if (batadv_skb_head_push(skb, hdr_size) < 0)
178                 return false;
179 
180         unicast_packet = (struct batadv_unicast_packet *)skb->data;
181         unicast_packet->version = BATADV_COMPAT_VERSION;
182         /* batman packet type: unicast */
183         unicast_packet->packet_type = BATADV_UNICAST;
184         /* set unicast ttl */
185         unicast_packet->ttl = BATADV_TTL;
186         /* copy the destination for faster routing */
187         ether_addr_copy(unicast_packet->dest, orig_node->orig);
188         /* set the destination tt version number */
189         unicast_packet->ttvn = ttvn;
190 
191         return true;
192 }
193 
194 /**
195  * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
196  * @skb: the skb containing the payload to encapsulate
197  * @orig_node: the destination node
198  *
199  * Returns false if the payload could not be encapsulated or true otherwise.
200  */
201 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
202                                             struct batadv_orig_node *orig_node)
203 {
204         size_t uni_size = sizeof(struct batadv_unicast_packet);
205 
206         return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
207 }
208 
209 /**
210  * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
211  *  unicast 4addr header
212  * @bat_priv: the bat priv with all the soft interface information
213  * @skb: the skb containing the payload to encapsulate
214  * @orig_node: the destination node
215  * @packet_subtype: the unicast 4addr packet subtype to use
216  *
217  * Returns false if the payload could not be encapsulated or true otherwise.
218  */
219 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
220                                            struct sk_buff *skb,
221                                            struct batadv_orig_node *orig,
222                                            int packet_subtype)
223 {
224         struct batadv_hard_iface *primary_if;
225         struct batadv_unicast_4addr_packet *uc_4addr_packet;
226         bool ret = false;
227 
228         primary_if = batadv_primary_if_get_selected(bat_priv);
229         if (!primary_if)
230                 goto out;
231 
232         /* Pull the header space and fill the unicast_packet substructure.
233          * We can do that because the first member of the uc_4addr_packet
234          * is of type struct unicast_packet
235          */
236         if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
237                                                orig))
238                 goto out;
239 
240         uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
241         uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
242         ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
243         uc_4addr_packet->subtype = packet_subtype;
244         uc_4addr_packet->reserved = 0;
245 
246         ret = true;
247 out:
248         if (primary_if)
249                 batadv_hardif_free_ref(primary_if);
250         return ret;
251 }
252 
253 /**
254  * batadv_send_skb_unicast - encapsulate and send an skb via unicast
255  * @bat_priv: the bat priv with all the soft interface information
256  * @skb: payload to send
257  * @packet_type: the batman unicast packet type to use
258  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
259  *  4addr packets)
260  * @orig_node: the originator to send the packet to
261  * @vid: the vid to be used to search the translation table
262  *
263  * Wrap the given skb into a batman-adv unicast or unicast-4addr header
264  * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
265  * as packet_type. Then send this frame to the given orig_node and release a
266  * reference to this orig_node.
267  *
268  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
269  */
270 int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
271                             struct sk_buff *skb, int packet_type,
272                             int packet_subtype,
273                             struct batadv_orig_node *orig_node,
274                             unsigned short vid)
275 {
276         struct batadv_unicast_packet *unicast_packet;
277         struct ethhdr *ethhdr;
278         int ret = NET_XMIT_DROP;
279 
280         if (!orig_node)
281                 goto out;
282 
283         switch (packet_type) {
284         case BATADV_UNICAST:
285                 if (!batadv_send_skb_prepare_unicast(skb, orig_node))
286                         goto out;
287                 break;
288         case BATADV_UNICAST_4ADDR:
289                 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
290                                                            orig_node,
291                                                            packet_subtype))
292                         goto out;
293                 break;
294         default:
295                 /* this function supports UNICAST and UNICAST_4ADDR only. It
296                  * should never be invoked with any other packet type
297                  */
298                 goto out;
299         }
300 
301         /* skb->data might have been reallocated by
302          * batadv_send_skb_prepare_unicast{,_4addr}()
303          */
304         ethhdr = eth_hdr(skb);
305         unicast_packet = (struct batadv_unicast_packet *)skb->data;
306 
307         /* inform the destination node that we are still missing a correct route
308          * for this client. The destination will receive this packet and will
309          * try to reroute it because the ttvn contained in the header is less
310          * than the current one
311          */
312         if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
313                 unicast_packet->ttvn = unicast_packet->ttvn - 1;
314 
315         if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
316                 ret = NET_XMIT_SUCCESS;
317 
318 out:
319         if (orig_node)
320                 batadv_orig_node_free_ref(orig_node);
321         if (ret == NET_XMIT_DROP)
322                 kfree_skb(skb);
323         return ret;
324 }
325 
326 /**
327  * batadv_send_skb_via_tt_generic - send an skb via TT lookup
328  * @bat_priv: the bat priv with all the soft interface information
329  * @skb: payload to send
330  * @packet_type: the batman unicast packet type to use
331  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
332  *  4addr packets)
333  * @dst_hint: can be used to override the destination contained in the skb
334  * @vid: the vid to be used to search the translation table
335  *
336  * Look up the recipient node for the destination address in the ethernet
337  * header via the translation table. Wrap the given skb into a batman-adv
338  * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
339  * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
340  * to the according destination node.
341  *
342  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
343  */
344 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
345                                    struct sk_buff *skb, int packet_type,
346                                    int packet_subtype, uint8_t *dst_hint,
347                                    unsigned short vid)
348 {
349         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
350         struct batadv_orig_node *orig_node;
351         uint8_t *src, *dst;
352 
353         src = ethhdr->h_source;
354         dst = ethhdr->h_dest;
355 
356         /* if we got an hint! let's send the packet to this client (if any) */
357         if (dst_hint) {
358                 src = NULL;
359                 dst = dst_hint;
360         }
361         orig_node = batadv_transtable_search(bat_priv, src, dst, vid);
362 
363         return batadv_send_skb_unicast(bat_priv, skb, packet_type,
364                                        packet_subtype, orig_node, vid);
365 }
366 
367 /**
368  * batadv_send_skb_via_gw - send an skb via gateway lookup
369  * @bat_priv: the bat priv with all the soft interface information
370  * @skb: payload to send
371  * @vid: the vid to be used to search the translation table
372  *
373  * Look up the currently selected gateway. Wrap the given skb into a batman-adv
374  * unicast header and send this frame to this gateway node.
375  *
376  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
377  */
378 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
379                            unsigned short vid)
380 {
381         struct batadv_orig_node *orig_node;
382 
383         orig_node = batadv_gw_get_selected_orig(bat_priv);
384         return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
385                                        orig_node, vid);
386 }
387 
388 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
389 {
390         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
391 
392         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
393             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
394                 return;
395 
396         /* the interface gets activated here to avoid race conditions between
397          * the moment of activating the interface in
398          * hardif_activate_interface() where the originator mac is set and
399          * outdated packets (especially uninitialized mac addresses) in the
400          * packet queue
401          */
402         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
403                 hard_iface->if_status = BATADV_IF_ACTIVE;
404 
405         bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
406 }
407 
408 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
409 {
410         if (forw_packet->skb)
411                 kfree_skb(forw_packet->skb);
412         if (forw_packet->if_incoming)
413                 batadv_hardif_free_ref(forw_packet->if_incoming);
414         if (forw_packet->if_outgoing)
415                 batadv_hardif_free_ref(forw_packet->if_outgoing);
416         kfree(forw_packet);
417 }
418 
419 static void
420 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
421                                  struct batadv_forw_packet *forw_packet,
422                                  unsigned long send_time)
423 {
424         /* add new packet to packet list */
425         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
426         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
427         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
428 
429         /* start timer for this packet */
430         queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
431                            send_time);
432 }
433 
434 /* add a broadcast packet to the queue and setup timers. broadcast packets
435  * are sent multiple times to increase probability for being received.
436  *
437  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
438  * errors.
439  *
440  * The skb is not consumed, so the caller should make sure that the
441  * skb is freed.
442  */
443 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
444                                     const struct sk_buff *skb,
445                                     unsigned long delay)
446 {
447         struct batadv_hard_iface *primary_if = NULL;
448         struct batadv_forw_packet *forw_packet;
449         struct batadv_bcast_packet *bcast_packet;
450         struct sk_buff *newskb;
451 
452         if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
453                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
454                            "bcast packet queue full\n");
455                 goto out;
456         }
457 
458         primary_if = batadv_primary_if_get_selected(bat_priv);
459         if (!primary_if)
460                 goto out_and_inc;
461 
462         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
463 
464         if (!forw_packet)
465                 goto out_and_inc;
466 
467         newskb = skb_copy(skb, GFP_ATOMIC);
468         if (!newskb)
469                 goto packet_free;
470 
471         /* as we have a copy now, it is safe to decrease the TTL */
472         bcast_packet = (struct batadv_bcast_packet *)newskb->data;
473         bcast_packet->ttl--;
474 
475         skb_reset_mac_header(newskb);
476 
477         forw_packet->skb = newskb;
478         forw_packet->if_incoming = primary_if;
479         forw_packet->if_outgoing = NULL;
480 
481         /* how often did we send the bcast packet ? */
482         forw_packet->num_packets = 0;
483 
484         INIT_DELAYED_WORK(&forw_packet->delayed_work,
485                           batadv_send_outstanding_bcast_packet);
486 
487         _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
488         return NETDEV_TX_OK;
489 
490 packet_free:
491         kfree(forw_packet);
492 out_and_inc:
493         atomic_inc(&bat_priv->bcast_queue_left);
494 out:
495         if (primary_if)
496                 batadv_hardif_free_ref(primary_if);
497         return NETDEV_TX_BUSY;
498 }
499 
500 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
501 {
502         struct batadv_hard_iface *hard_iface;
503         struct delayed_work *delayed_work;
504         struct batadv_forw_packet *forw_packet;
505         struct sk_buff *skb1;
506         struct net_device *soft_iface;
507         struct batadv_priv *bat_priv;
508 
509         delayed_work = container_of(work, struct delayed_work, work);
510         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
511                                    delayed_work);
512         soft_iface = forw_packet->if_incoming->soft_iface;
513         bat_priv = netdev_priv(soft_iface);
514 
515         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
516         hlist_del(&forw_packet->list);
517         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
518 
519         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
520                 goto out;
521 
522         if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
523                 goto out;
524 
525         /* rebroadcast packet */
526         rcu_read_lock();
527         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
528                 if (hard_iface->soft_iface != soft_iface)
529                         continue;
530 
531                 if (forw_packet->num_packets >= hard_iface->num_bcasts)
532                         continue;
533 
534                 /* send a copy of the saved skb */
535                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
536                 if (skb1)
537                         batadv_send_skb_packet(skb1, hard_iface,
538                                                batadv_broadcast_addr);
539         }
540         rcu_read_unlock();
541 
542         forw_packet->num_packets++;
543 
544         /* if we still have some more bcasts to send */
545         if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
546                 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
547                                                  msecs_to_jiffies(5));
548                 return;
549         }
550 
551 out:
552         batadv_forw_packet_free(forw_packet);
553         atomic_inc(&bat_priv->bcast_queue_left);
554 }
555 
556 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
557 {
558         struct delayed_work *delayed_work;
559         struct batadv_forw_packet *forw_packet;
560         struct batadv_priv *bat_priv;
561 
562         delayed_work = container_of(work, struct delayed_work, work);
563         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
564                                    delayed_work);
565         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
566         spin_lock_bh(&bat_priv->forw_bat_list_lock);
567         hlist_del(&forw_packet->list);
568         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
569 
570         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
571                 goto out;
572 
573         bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
574 
575         /* we have to have at least one packet in the queue to determine the
576          * queues wake up time unless we are shutting down.
577          *
578          * only re-schedule if this is the "original" copy, e.g. the OGM of the
579          * primary interface should only be rescheduled once per period, but
580          * this function will be called for the forw_packet instances of the
581          * other secondary interfaces as well.
582          */
583         if (forw_packet->own &&
584             forw_packet->if_incoming == forw_packet->if_outgoing)
585                 batadv_schedule_bat_ogm(forw_packet->if_incoming);
586 
587 out:
588         /* don't count own packet */
589         if (!forw_packet->own)
590                 atomic_inc(&bat_priv->batman_queue_left);
591 
592         batadv_forw_packet_free(forw_packet);
593 }
594 
595 void
596 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
597                                  const struct batadv_hard_iface *hard_iface)
598 {
599         struct batadv_forw_packet *forw_packet;
600         struct hlist_node *safe_tmp_node;
601         bool pending;
602 
603         if (hard_iface)
604                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
605                            "purge_outstanding_packets(): %s\n",
606                            hard_iface->net_dev->name);
607         else
608                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
609                            "purge_outstanding_packets()\n");
610 
611         /* free bcast list */
612         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
613         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
614                                   &bat_priv->forw_bcast_list, list) {
615                 /* if purge_outstanding_packets() was called with an argument
616                  * we delete only packets belonging to the given interface
617                  */
618                 if ((hard_iface) &&
619                     (forw_packet->if_incoming != hard_iface))
620                         continue;
621 
622                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
623 
624                 /* batadv_send_outstanding_bcast_packet() will lock the list to
625                  * delete the item from the list
626                  */
627                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
628                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
629 
630                 if (pending) {
631                         hlist_del(&forw_packet->list);
632                         batadv_forw_packet_free(forw_packet);
633                 }
634         }
635         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
636 
637         /* free batman packet list */
638         spin_lock_bh(&bat_priv->forw_bat_list_lock);
639         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
640                                   &bat_priv->forw_bat_list, list) {
641                 /* if purge_outstanding_packets() was called with an argument
642                  * we delete only packets belonging to the given interface
643                  */
644                 if ((hard_iface) &&
645                     (forw_packet->if_incoming != hard_iface) &&
646                     (forw_packet->if_outgoing != hard_iface))
647                         continue;
648 
649                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
650 
651                 /* send_outstanding_bat_packet() will lock the list to
652                  * delete the item from the list
653                  */
654                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
655                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
656 
657                 if (pending) {
658                         hlist_del(&forw_packet->list);
659                         batadv_forw_packet_free(forw_packet);
660                 }
661         }
662         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
663 }
664 

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