net/batman-adv/send.c

   1 /* Copyright (C) 2007-2016  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/kref.h>
  30 #include <linux/list.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/printk.h>
  33 #include <linux/rculist.h>
  34 #include <linux/rcupdate.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/stddef.h>
  39 #include <linux/workqueue.h>
  40
  41 #include "distributed-arp-table.h"
  42 #include "fragmentation.h"
  43 #include "gateway_client.h"
  44 #include "hard-interface.h"
  45 #include "network-coding.h"
  46 #include "originator.h"
  47 #include "routing.h"
  48 #include "soft-interface.h"
  49 #include "translation-table.h"
  50
  51 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
  52
  53 /**
  54  * batadv_send_skb_packet - send an already prepared packet
  55  * @skb: the packet to send
  56  * @hard_iface: the interface to use to send the broadcast packet
  57  * @dst_addr: the payload destination
  58  *
  59  * Send out an already prepared packet to the given neighbor or broadcast it
  60  * using the specified interface. Either hard_iface or neigh_node must be not
  61  * NULL.
  62  * If neigh_node is NULL, then the packet is broadcasted using hard_iface,
  63  * otherwise it is sent as unicast to the given neighbor.
  64  *
  65  * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb)
  66  * otherwise
  67  */
  68 int batadv_send_skb_packet(struct sk_buff *skb,
  69                            struct batadv_hard_iface *hard_iface,
  70                            const u8 *dst_addr)
  71 {
  72         struct batadv_priv *bat_priv;
  73         struct ethhdr *ethhdr;
  74
  75         bat_priv = netdev_priv(hard_iface->soft_iface);
  76
  77         if (hard_iface->if_status != BATADV_IF_ACTIVE)
  78                 goto send_skb_err;
  79
  80         if (unlikely(!hard_iface->net_dev))
  81                 goto send_skb_err;
  82
  83         if (!(hard_iface->net_dev->flags & IFF_UP)) {
  84                 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
  85                         hard_iface->net_dev->name);
  86                 goto send_skb_err;
  87         }
  88
  89         /* push to the ethernet header. */
  90         if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
  91                 goto send_skb_err;
  92
  93         skb_reset_mac_header(skb);
  94
  95         ethhdr = eth_hdr(skb);
  96         ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
  97         ether_addr_copy(ethhdr->h_dest, dst_addr);
  98         ethhdr->h_proto = htons(ETH_P_BATMAN);
  99
 100         skb_set_network_header(skb, ETH_HLEN);
 101         skb->protocol = htons(ETH_P_BATMAN);
 102
 103         skb->dev = hard_iface->net_dev;
 104
 105         /* Save a clone of the skb to use when decoding coded packets */
 106         batadv_nc_skb_store_for_decoding(bat_priv, skb);
 107
 108         /* dev_queue_xmit() returns a negative result on error.  However on
 109          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 110          * (which is > 0). This will not be treated as an error.
 111          */
 112         return dev_queue_xmit(skb);
 113 send_skb_err:
 114         kfree_skb(skb);
 115         return NET_XMIT_DROP;
 116 }
 117
 118 int batadv_send_broadcast_skb(struct sk_buff *skb,
 119                               struct batadv_hard_iface *hard_iface)
 120 {
 121         return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 122 }
 123
 124 int batadv_send_unicast_skb(struct sk_buff *skb,
 125                             struct batadv_neigh_node *neigh)
 126 {
 127 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 128         struct batadv_hardif_neigh_node *hardif_neigh;
 129 #endif
 130         int ret;
 131
 132         ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr);
 133
 134 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 135         hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr);
 136
 137         if ((hardif_neigh) && (ret != NET_XMIT_DROP))
 138                 hardif_neigh->bat_v.last_unicast_tx = jiffies;
 139
 140         if (hardif_neigh)
 141                 batadv_hardif_neigh_put(hardif_neigh);
 142 #endif
 143
 144         return ret;
 145 }
 146
 147 /**
 148  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
 149  * @skb: Packet to be transmitted.
 150  * @orig_node: Final destination of the packet.
 151  * @recv_if: Interface used when receiving the packet (can be NULL).
 152  *
 153  * Looks up the best next-hop towards the passed originator and passes the
 154  * skb on for preparation of MAC header. If the packet originated from this
 155  * host, NULL can be passed as recv_if and no interface alternating is
 156  * attempted.
 157  *
 158  * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
 159  * NET_XMIT_POLICED if the skb is buffered for later transmit.
 160  */
 161 int batadv_send_skb_to_orig(struct sk_buff *skb,
 162                             struct batadv_orig_node *orig_node,
 163                             struct batadv_hard_iface *recv_if)
 164 {
 165         struct batadv_priv *bat_priv = orig_node->bat_priv;
 166         struct batadv_neigh_node *neigh_node;
 167         int ret = NET_XMIT_DROP;
 168
 169         /* batadv_find_router() increases neigh_nodes refcount if found. */
 170         neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
 171         if (!neigh_node)
 172                 goto out;
 173
 174         /* Check if the skb is too large to send in one piece and fragment
 175          * it if needed.
 176          */
 177         if (atomic_read(&bat_priv->fragmentation) &&
 178             skb->len > neigh_node->if_incoming->net_dev->mtu) {
 179                 /* Fragment and send packet. */
 180                 if (batadv_frag_send_packet(skb, orig_node, neigh_node))
 181                         ret = NET_XMIT_SUCCESS;
 182
 183                 goto out;
 184         }
 185
 186         /* try to network code the packet, if it is received on an interface
 187          * (i.e. being forwarded). If the packet originates from this node or if
 188          * network coding fails, then send the packet as usual.
 189          */
 190         if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
 191                 ret = NET_XMIT_POLICED;
 192         } else {
 193                 batadv_send_unicast_skb(skb, neigh_node);
 194                 ret = NET_XMIT_SUCCESS;
 195         }
 196
 197 out:
 198         if (neigh_node)
 199                 batadv_neigh_node_put(neigh_node);
 200
 201         return ret;
 202 }
 203
 204 /**
 205  * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
 206  *  common fields for unicast packets
 207  * @skb: the skb carrying the unicast header to initialize
 208  * @hdr_size: amount of bytes to push at the beginning of the skb
 209  * @orig_node: the destination node
 210  *
 211  * Return: false if the buffer extension was not possible or true otherwise.
 212  */
 213 static bool
 214 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
 215                                   struct batadv_orig_node *orig_node)
 216 {
 217         struct batadv_unicast_packet *unicast_packet;
 218         u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn);
 219
 220         if (batadv_skb_head_push(skb, hdr_size) < 0)
 221                 return false;
 222
 223         unicast_packet = (struct batadv_unicast_packet *)skb->data;
 224         unicast_packet->version = BATADV_COMPAT_VERSION;
 225         /* batman packet type: unicast */
 226         unicast_packet->packet_type = BATADV_UNICAST;
 227         /* set unicast ttl */
 228         unicast_packet->ttl = BATADV_TTL;
 229         /* copy the destination for faster routing */
 230         ether_addr_copy(unicast_packet->dest, orig_node->orig);
 231         /* set the destination tt version number */
 232         unicast_packet->ttvn = ttvn;
 233
 234         return true;
 235 }
 236
 237 /**
 238  * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
 239  * @skb: the skb containing the payload to encapsulate
 240  * @orig_node: the destination node
 241  *
 242  * Return: false if the payload could not be encapsulated or true otherwise.
 243  */
 244 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
 245                                             struct batadv_orig_node *orig_node)
 246 {
 247         size_t uni_size = sizeof(struct batadv_unicast_packet);
 248
 249         return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
 250 }
 251
 252 /**
 253  * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
 254  *  unicast 4addr header
 255  * @bat_priv: the bat priv with all the soft interface information
 256  * @skb: the skb containing the payload to encapsulate
 257  * @orig: the destination node
 258  * @packet_subtype: the unicast 4addr packet subtype to use
 259  *
 260  * Return: false if the payload could not be encapsulated or true otherwise.
 261  */
 262 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
 263                                            struct sk_buff *skb,
 264                                            struct batadv_orig_node *orig,
 265                                            int packet_subtype)
 266 {
 267         struct batadv_hard_iface *primary_if;
 268         struct batadv_unicast_4addr_packet *uc_4addr_packet;
 269         bool ret = false;
 270
 271         primary_if = batadv_primary_if_get_selected(bat_priv);
 272         if (!primary_if)
 273                 goto out;
 274
 275         /* Pull the header space and fill the unicast_packet substructure.
 276          * We can do that because the first member of the uc_4addr_packet
 277          * is of type struct unicast_packet
 278          */
 279         if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
 280                                                orig))
 281                 goto out;
 282
 283         uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
 284         uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
 285         ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
 286         uc_4addr_packet->subtype = packet_subtype;
 287         uc_4addr_packet->reserved = 0;
 288
 289         ret = true;
 290 out:
 291         if (primary_if)
 292                 batadv_hardif_put(primary_if);
 293         return ret;
 294 }
 295
 296 /**
 297  * batadv_send_skb_unicast - encapsulate and send an skb via unicast
 298  * @bat_priv: the bat priv with all the soft interface information
 299  * @skb: payload to send
 300  * @packet_type: the batman unicast packet type to use
 301  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 302  *  4addr packets)
 303  * @orig_node: the originator to send the packet to
 304  * @vid: the vid to be used to search the translation table
 305  *
 306  * Wrap the given skb into a batman-adv unicast or unicast-4addr header
 307  * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
 308  * as packet_type. Then send this frame to the given orig_node and release a
 309  * reference to this orig_node.
 310  *
 311  * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 312  */
 313 int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 314                             struct sk_buff *skb, int packet_type,
 315                             int packet_subtype,
 316                             struct batadv_orig_node *orig_node,
 317                             unsigned short vid)
 318 {
 319         struct batadv_unicast_packet *unicast_packet;
 320         struct ethhdr *ethhdr;
 321         int ret = NET_XMIT_DROP;
 322
 323         if (!orig_node)
 324                 goto out;
 325
 326         switch (packet_type) {
 327         case BATADV_UNICAST:
 328                 if (!batadv_send_skb_prepare_unicast(skb, orig_node))
 329                         goto out;
 330                 break;
 331         case BATADV_UNICAST_4ADDR:
 332                 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
 333                                                            orig_node,
 334                                                            packet_subtype))
 335                         goto out;
 336                 break;
 337         default:
 338                 /* this function supports UNICAST and UNICAST_4ADDR only. It
 339                  * should never be invoked with any other packet type
 340                  */
 341                 goto out;
 342         }
 343
 344         /* skb->data might have been reallocated by
 345          * batadv_send_skb_prepare_unicast{,_4addr}()
 346          */
 347         ethhdr = eth_hdr(skb);
 348         unicast_packet = (struct batadv_unicast_packet *)skb->data;
 349
 350         /* inform the destination node that we are still missing a correct route
 351          * for this client. The destination will receive this packet and will
 352          * try to reroute it because the ttvn contained in the header is less
 353          * than the current one
 354          */
 355         if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
 356                 unicast_packet->ttvn = unicast_packet->ttvn - 1;
 357
 358         if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 359                 ret = NET_XMIT_SUCCESS;
 360
 361 out:
 362         if (orig_node)
 363                 batadv_orig_node_put(orig_node);
 364         if (ret == NET_XMIT_DROP)
 365                 kfree_skb(skb);
 366         return ret;
 367 }
 368
 369 /**
 370  * batadv_send_skb_via_tt_generic - send an skb via TT lookup
 371  * @bat_priv: the bat priv with all the soft interface information
 372  * @skb: payload to send
 373  * @packet_type: the batman unicast packet type to use
 374  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 375  *  4addr packets)
 376  * @dst_hint: can be used to override the destination contained in the skb
 377  * @vid: the vid to be used to search the translation table
 378  *
 379  * Look up the recipient node for the destination address in the ethernet
 380  * header via the translation table. Wrap the given skb into a batman-adv
 381  * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
 382  * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
 383  * to the according destination node.
 384  *
 385  * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 386  */
 387 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
 388                                    struct sk_buff *skb, int packet_type,
 389                                    int packet_subtype, u8 *dst_hint,
 390                                    unsigned short vid)
 391 {
 392         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 393         struct batadv_orig_node *orig_node;
 394         u8 *src, *dst;
 395
 396         src = ethhdr->h_source;
 397         dst = ethhdr->h_dest;
 398
 399         /* if we got an hint! let's send the packet to this client (if any) */
 400         if (dst_hint) {
 401                 src = NULL;
 402                 dst = dst_hint;
 403         }
 404         orig_node = batadv_transtable_search(bat_priv, src, dst, vid);
 405
 406         return batadv_send_skb_unicast(bat_priv, skb, packet_type,
 407                                        packet_subtype, orig_node, vid);
 408 }
 409
 410 /**
 411  * batadv_send_skb_via_gw - send an skb via gateway lookup
 412  * @bat_priv: the bat priv with all the soft interface information
 413  * @skb: payload to send
 414  * @vid: the vid to be used to search the translation table
 415  *
 416  * Look up the currently selected gateway. Wrap the given skb into a batman-adv
 417  * unicast header and send this frame to this gateway node.
 418  *
 419  * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 420  */
 421 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
 422                            unsigned short vid)
 423 {
 424         struct batadv_orig_node *orig_node;
 425
 426         orig_node = batadv_gw_get_selected_orig(bat_priv);
 427         return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST_4ADDR,
 428                                        BATADV_P_DATA, orig_node, vid);
 429 }
 430
 431 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
 432 {
 433         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 434
 435         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
 436             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
 437                 return;
 438
 439         /* the interface gets activated here to avoid race conditions between
 440          * the moment of activating the interface in
 441          * hardif_activate_interface() where the originator mac is set and
 442          * outdated packets (especially uninitialized mac addresses) in the
 443          * packet queue
 444          */
 445         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 446                 hard_iface->if_status = BATADV_IF_ACTIVE;
 447
 448         bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
 449 }
 450
 451 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
 452 {
 453         kfree_skb(forw_packet->skb);
 454         if (forw_packet->if_incoming)
 455                 batadv_hardif_put(forw_packet->if_incoming);
 456         if (forw_packet->if_outgoing)
 457                 batadv_hardif_put(forw_packet->if_outgoing);
 458         kfree(forw_packet);
 459 }
 460
 461 static void
 462 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 463                                  struct batadv_forw_packet *forw_packet,
 464                                  unsigned long send_time)
 465 {
 466         /* add new packet to packet list */
 467         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 468         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 469         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 470
 471         /* start timer for this packet */
 472         queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
 473                            send_time);
 474 }
 475
 476 /**
 477  * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends
 478  * @bat_priv: the bat priv with all the soft interface information
 479  * @skb: broadcast packet to add
 480  * @delay: number of jiffies to wait before sending
 481  *
 482  * add a broadcast packet to the queue and setup timers. broadcast packets
 483  * are sent multiple times to increase probability for being received.
 484  *
 485  * The skb is not consumed, so the caller should make sure that the
 486  * skb is freed.
 487  *
 488  * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
 489  */
 490 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 491                                     const struct sk_buff *skb,
 492                                     unsigned long delay)
 493 {
 494         struct batadv_hard_iface *primary_if = NULL;
 495         struct batadv_forw_packet *forw_packet;
 496         struct batadv_bcast_packet *bcast_packet;
 497         struct sk_buff *newskb;
 498
 499         if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 500                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 501                            "bcast packet queue full\n");
 502                 goto out;
 503         }
 504
 505         primary_if = batadv_primary_if_get_selected(bat_priv);
 506         if (!primary_if)
 507                 goto out_and_inc;
 508
 509         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 510
 511         if (!forw_packet)
 512                 goto out_and_inc;
 513
 514         newskb = skb_copy(skb, GFP_ATOMIC);
 515         if (!newskb)
 516                 goto packet_free;
 517
 518         /* as we have a copy now, it is safe to decrease the TTL */
 519         bcast_packet = (struct batadv_bcast_packet *)newskb->data;
 520         bcast_packet->ttl--;
 521
 522         skb_reset_mac_header(newskb);
 523
 524         forw_packet->skb = newskb;
 525         forw_packet->if_incoming = primary_if;
 526         forw_packet->if_outgoing = NULL;
 527
 528         /* how often did we send the bcast packet ? */
 529         forw_packet->num_packets = 0;
 530
 531         INIT_DELAYED_WORK(&forw_packet->delayed_work,
 532                           batadv_send_outstanding_bcast_packet);
 533
 534         _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
 535         return NETDEV_TX_OK;
 536
 537 packet_free:
 538         kfree(forw_packet);
 539 out_and_inc:
 540         atomic_inc(&bat_priv->bcast_queue_left);
 541 out:
 542         if (primary_if)
 543                 batadv_hardif_put(primary_if);
 544         return NETDEV_TX_BUSY;
 545 }
 546
 547 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
 548 {
 549         struct batadv_hard_iface *hard_iface;
 550         struct delayed_work *delayed_work;
 551         struct batadv_forw_packet *forw_packet;
 552         struct sk_buff *skb1;
 553         struct net_device *soft_iface;
 554         struct batadv_priv *bat_priv;
 555
 556         delayed_work = to_delayed_work(work);
 557         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 558                                    delayed_work);
 559         soft_iface = forw_packet->if_incoming->soft_iface;
 560         bat_priv = netdev_priv(soft_iface);
 561
 562         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 563         hlist_del(&forw_packet->list);
 564         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 565
 566         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 567                 goto out;
 568
 569         if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
 570                 goto out;
 571
 572         /* rebroadcast packet */
 573         rcu_read_lock();
 574         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 575                 if (hard_iface->soft_iface != soft_iface)
 576                         continue;
 577
 578                 if (forw_packet->num_packets >= hard_iface->num_bcasts)
 579                         continue;
 580
 581                 if (!kref_get_unless_zero(&hard_iface->refcount))
 582                         continue;
 583
 584                 /* send a copy of the saved skb */
 585                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 586                 if (skb1)
 587                         batadv_send_broadcast_skb(skb1, hard_iface);
 588
 589                 batadv_hardif_put(hard_iface);
 590         }
 591         rcu_read_unlock();
 592
 593         forw_packet->num_packets++;
 594
 595         /* if we still have some more bcasts to send */
 596         if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
 597                 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
 598                                                  msecs_to_jiffies(5));
 599                 return;
 600         }
 601
 602 out:
 603         batadv_forw_packet_free(forw_packet);
 604         atomic_inc(&bat_priv->bcast_queue_left);
 605 }
 606
 607 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
 608 {
 609         struct delayed_work *delayed_work;
 610         struct batadv_forw_packet *forw_packet;
 611         struct batadv_priv *bat_priv;
 612
 613         delayed_work = to_delayed_work(work);
 614         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 615                                    delayed_work);
 616         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 617         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 618         hlist_del(&forw_packet->list);
 619         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 620
 621         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 622                 goto out;
 623
 624         bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
 625
 626         /* we have to have at least one packet in the queue to determine the
 627          * queues wake up time unless we are shutting down.
 628          *
 629          * only re-schedule if this is the "original" copy, e.g. the OGM of the
 630          * primary interface should only be rescheduled once per period, but
 631          * this function will be called for the forw_packet instances of the
 632          * other secondary interfaces as well.
 633          */
 634         if (forw_packet->own &&
 635             forw_packet->if_incoming == forw_packet->if_outgoing)
 636                 batadv_schedule_bat_ogm(forw_packet->if_incoming);
 637
 638 out:
 639         /* don't count own packet */
 640         if (!forw_packet->own)
 641                 atomic_inc(&bat_priv->batman_queue_left);
 642
 643         batadv_forw_packet_free(forw_packet);
 644 }
 645
 646 void
 647 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
 648                                  const struct batadv_hard_iface *hard_iface)
 649 {
 650         struct batadv_forw_packet *forw_packet;
 651         struct hlist_node *safe_tmp_node;
 652         bool pending;
 653
 654         if (hard_iface)
 655                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 656                            "purge_outstanding_packets(): %s\n",
 657                            hard_iface->net_dev->name);
 658         else
 659                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 660                            "purge_outstanding_packets()\n");
 661
 662         /* free bcast list */
 663         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 664         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
 665                                   &bat_priv->forw_bcast_list, list) {
 666                 /* if purge_outstanding_packets() was called with an argument
 667                  * we delete only packets belonging to the given interface
 668                  */
 669                 if ((hard_iface) &&
 670                     (forw_packet->if_incoming != hard_iface) &&
 671                     (forw_packet->if_outgoing != hard_iface))
 672                         continue;
 673
 674                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 675
 676                 /* batadv_send_outstanding_bcast_packet() will lock the list to
 677                  * delete the item from the list
 678                  */
 679                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 680                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 681
 682                 if (pending) {
 683                         hlist_del(&forw_packet->list);
 684                         if (!forw_packet->own)
 685                                 atomic_inc(&bat_priv->bcast_queue_left);
 686
 687                         batadv_forw_packet_free(forw_packet);
 688                 }
 689         }
 690         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 691
 692         /* free batman packet list */
 693         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 694         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
 695                                   &bat_priv->forw_bat_list, list) {
 696                 /* if purge_outstanding_packets() was called with an argument
 697                  * we delete only packets belonging to the given interface
 698                  */
 699                 if ((hard_iface) &&
 700                     (forw_packet->if_incoming != hard_iface) &&
 701                     (forw_packet->if_outgoing != hard_iface))
 702                         continue;
 703
 704                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 705
 706                 /* send_outstanding_bat_packet() will lock the list to
 707                  * delete the item from the list
 708                  */
 709                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 710                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
 711
 712                 if (pending) {
 713                         hlist_del(&forw_packet->list);
 714                         if (!forw_packet->own)
 715                                 atomic_inc(&bat_priv->batman_queue_left);
 716
 717                         batadv_forw_packet_free(forw_packet);
 718                 }
 719         }
 720         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 721 }