net/batman-adv/soft-interface.c

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "soft-interface.h"
  24 #include "hard-interface.h"
  25 #include "routing.h"
  26 #include "send.h"
  27 #include "bat_debugfs.h"
  28 #include "translation-table.h"
  29 #include "hash.h"
  30 #include "gateway_common.h"
  31 #include "gateway_client.h"
  32 #include "bat_sysfs.h"
  33 #include "originator.h"
  34 #include <linux/slab.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/etherdevice.h>
  37 #include <linux/if_vlan.h>
  38 #include "unicast.h"
  39
  40
  41 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  42 static void bat_get_drvinfo(struct net_device *dev,
  43                             struct ethtool_drvinfo *info);
  44 static u32 bat_get_msglevel(struct net_device *dev);
  45 static void bat_set_msglevel(struct net_device *dev, u32 value);
  46 static u32 bat_get_link(struct net_device *dev);
  47
  48 static const struct ethtool_ops bat_ethtool_ops = {
  49         .get_settings = bat_get_settings,
  50         .get_drvinfo = bat_get_drvinfo,
  51         .get_msglevel = bat_get_msglevel,
  52         .set_msglevel = bat_set_msglevel,
  53         .get_link = bat_get_link,
  54 };
  55
  56 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
  57 {
  58         int result;
  59
  60         /**
  61          * TODO: We must check if we can release all references to non-payload
  62          * data using skb_header_release in our skbs to allow skb_cow_header to
  63          * work optimally. This means that those skbs are not allowed to read
  64          * or write any data which is before the current position of skb->data
  65          * after that call and thus allow other skbs with the same data buffer
  66          * to write freely in that area.
  67          */
  68         result = skb_cow_head(skb, len);
  69         if (result < 0)
  70                 return result;
  71
  72         skb_push(skb, len);
  73         return 0;
  74 }
  75
  76 static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
  77 {
  78         if (atomic_dec_and_test(&softif_neigh->refcount))
  79                 kfree_rcu(softif_neigh, rcu);
  80 }
  81
  82 static void softif_neigh_vid_free_rcu(struct rcu_head *rcu)
  83 {
  84         struct softif_neigh_vid *softif_neigh_vid;
  85         struct softif_neigh *softif_neigh;
  86         struct hlist_node *node, *node_tmp;
  87         struct bat_priv *bat_priv;
  88
  89         softif_neigh_vid = container_of(rcu, struct softif_neigh_vid, rcu);
  90         bat_priv = softif_neigh_vid->bat_priv;
  91
  92         spin_lock_bh(&bat_priv->softif_neigh_lock);
  93         hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
  94                                   &softif_neigh_vid->softif_neigh_list, list) {
  95                 hlist_del_rcu(&softif_neigh->list);
  96                 softif_neigh_free_ref(softif_neigh);
  97         }
  98         spin_unlock_bh(&bat_priv->softif_neigh_lock);
  99
 100         kfree(softif_neigh_vid);
 101 }
 102
 103 static void softif_neigh_vid_free_ref(struct softif_neigh_vid *softif_neigh_vid)
 104 {
 105         if (atomic_dec_and_test(&softif_neigh_vid->refcount))
 106                 call_rcu(&softif_neigh_vid->rcu, softif_neigh_vid_free_rcu);
 107 }
 108
 109 static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
 110                                                      short vid)
 111 {
 112         struct softif_neigh_vid *softif_neigh_vid;
 113         struct hlist_node *node;
 114
 115         rcu_read_lock();
 116         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 117                                  &bat_priv->softif_neigh_vids, list) {
 118                 if (softif_neigh_vid->vid != vid)
 119                         continue;
 120
 121                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 122                         continue;
 123
 124                 goto out;
 125         }
 126
 127         softif_neigh_vid = kzalloc(sizeof(*softif_neigh_vid), GFP_ATOMIC);
 128         if (!softif_neigh_vid)
 129                 goto out;
 130
 131         softif_neigh_vid->vid = vid;
 132         softif_neigh_vid->bat_priv = bat_priv;
 133
 134         /* initialize with 2 - caller decrements counter by one */
 135         atomic_set(&softif_neigh_vid->refcount, 2);
 136         INIT_HLIST_HEAD(&softif_neigh_vid->softif_neigh_list);
 137         INIT_HLIST_NODE(&softif_neigh_vid->list);
 138         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 139         hlist_add_head_rcu(&softif_neigh_vid->list,
 140                            &bat_priv->softif_neigh_vids);
 141         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 142
 143 out:
 144         rcu_read_unlock();
 145         return softif_neigh_vid;
 146 }
 147
 148 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 149                                              const uint8_t *addr, short vid)
 150 {
 151         struct softif_neigh_vid *softif_neigh_vid;
 152         struct softif_neigh *softif_neigh = NULL;
 153         struct hlist_node *node;
 154
 155         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 156         if (!softif_neigh_vid)
 157                 goto out;
 158
 159         rcu_read_lock();
 160         hlist_for_each_entry_rcu(softif_neigh, node,
 161                                  &softif_neigh_vid->softif_neigh_list,
 162                                  list) {
 163                 if (!compare_eth(softif_neigh->addr, addr))
 164                         continue;
 165
 166                 if (!atomic_inc_not_zero(&softif_neigh->refcount))
 167                         continue;
 168
 169                 softif_neigh->last_seen = jiffies;
 170                 goto unlock;
 171         }
 172
 173         softif_neigh = kzalloc(sizeof(*softif_neigh), GFP_ATOMIC);
 174         if (!softif_neigh)
 175                 goto unlock;
 176
 177         memcpy(softif_neigh->addr, addr, ETH_ALEN);
 178         softif_neigh->last_seen = jiffies;
 179         /* initialize with 2 - caller decrements counter by one */
 180         atomic_set(&softif_neigh->refcount, 2);
 181
 182         INIT_HLIST_NODE(&softif_neigh->list);
 183         spin_lock_bh(&bat_priv->softif_neigh_lock);
 184         hlist_add_head_rcu(&softif_neigh->list,
 185                            &softif_neigh_vid->softif_neigh_list);
 186         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 187
 188 unlock:
 189         rcu_read_unlock();
 190 out:
 191         if (softif_neigh_vid)
 192                 softif_neigh_vid_free_ref(softif_neigh_vid);
 193         return softif_neigh;
 194 }
 195
 196 static struct softif_neigh *softif_neigh_get_selected(
 197                                 struct softif_neigh_vid *softif_neigh_vid)
 198 {
 199         struct softif_neigh *softif_neigh;
 200
 201         rcu_read_lock();
 202         softif_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 203
 204         if (softif_neigh && !atomic_inc_not_zero(&softif_neigh->refcount))
 205                 softif_neigh = NULL;
 206
 207         rcu_read_unlock();
 208         return softif_neigh;
 209 }
 210
 211 static struct softif_neigh *softif_neigh_vid_get_selected(
 212                                                 struct bat_priv *bat_priv,
 213                                                 short vid)
 214 {
 215         struct softif_neigh_vid *softif_neigh_vid;
 216         struct softif_neigh *softif_neigh = NULL;
 217
 218         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 219         if (!softif_neigh_vid)
 220                 goto out;
 221
 222         softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 223 out:
 224         if (softif_neigh_vid)
 225                 softif_neigh_vid_free_ref(softif_neigh_vid);
 226         return softif_neigh;
 227 }
 228
 229 static void softif_neigh_vid_select(struct bat_priv *bat_priv,
 230                                     struct softif_neigh *new_neigh,
 231                                     short vid)
 232 {
 233         struct softif_neigh_vid *softif_neigh_vid;
 234         struct softif_neigh *curr_neigh;
 235
 236         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 237         if (!softif_neigh_vid)
 238                 goto out;
 239
 240         spin_lock_bh(&bat_priv->softif_neigh_lock);
 241
 242         if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
 243                 new_neigh = NULL;
 244
 245         curr_neigh = rcu_dereference_protected(softif_neigh_vid->softif_neigh,
 246                                                1);
 247         rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
 248
 249         if ((curr_neigh) && (!new_neigh))
 250                 bat_dbg(DBG_ROUTES, bat_priv,
 251                         "Removing mesh exit point on vid: %d (prev: %pM).\n",
 252                         vid, curr_neigh->addr);
 253         else if ((curr_neigh) && (new_neigh))
 254                 bat_dbg(DBG_ROUTES, bat_priv,
 255                         "Changing mesh exit point on vid: %d from %pM "
 256                         "to %pM.\n", vid, curr_neigh->addr, new_neigh->addr);
 257         else if ((!curr_neigh) && (new_neigh))
 258                 bat_dbg(DBG_ROUTES, bat_priv,
 259                         "Setting mesh exit point on vid: %d to %pM.\n",
 260                         vid, new_neigh->addr);
 261
 262         if (curr_neigh)
 263                 softif_neigh_free_ref(curr_neigh);
 264
 265         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 266
 267 out:
 268         if (softif_neigh_vid)
 269                 softif_neigh_vid_free_ref(softif_neigh_vid);
 270 }
 271
 272 static void softif_neigh_vid_deselect(struct bat_priv *bat_priv,
 273                                       struct softif_neigh_vid *softif_neigh_vid)
 274 {
 275         struct softif_neigh *curr_neigh;
 276         struct softif_neigh *softif_neigh = NULL, *softif_neigh_tmp;
 277         struct hard_iface *primary_if = NULL;
 278         struct hlist_node *node;
 279
 280         primary_if = primary_if_get_selected(bat_priv);
 281         if (!primary_if)
 282                 goto out;
 283
 284         /* find new softif_neigh immediately to avoid temporary loops */
 285         rcu_read_lock();
 286         curr_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 287
 288         hlist_for_each_entry_rcu(softif_neigh_tmp, node,
 289                                  &softif_neigh_vid->softif_neigh_list,
 290                                  list) {
 291                 if (softif_neigh_tmp == curr_neigh)
 292                         continue;
 293
 294                 /* we got a neighbor but its mac is 'bigger' than ours  */
 295                 if (memcmp(primary_if->net_dev->dev_addr,
 296                            softif_neigh_tmp->addr, ETH_ALEN) < 0)
 297                         continue;
 298
 299                 if (!atomic_inc_not_zero(&softif_neigh_tmp->refcount))
 300                         continue;
 301
 302                 softif_neigh = softif_neigh_tmp;
 303                 goto unlock;
 304         }
 305
 306 unlock:
 307         rcu_read_unlock();
 308 out:
 309         softif_neigh_vid_select(bat_priv, softif_neigh, softif_neigh_vid->vid);
 310
 311         if (primary_if)
 312                 hardif_free_ref(primary_if);
 313         if (softif_neigh)
 314                 softif_neigh_free_ref(softif_neigh);
 315 }
 316
 317 int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 318 {
 319         struct net_device *net_dev = (struct net_device *)seq->private;
 320         struct bat_priv *bat_priv = netdev_priv(net_dev);
 321         struct softif_neigh_vid *softif_neigh_vid;
 322         struct softif_neigh *softif_neigh;
 323         struct hard_iface *primary_if;
 324         struct hlist_node *node, *node_tmp;
 325         struct softif_neigh *curr_softif_neigh;
 326         int ret = 0, last_seen_secs, last_seen_msecs;
 327
 328         primary_if = primary_if_get_selected(bat_priv);
 329         if (!primary_if) {
 330                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
 331                                  "please specify interfaces to enable it\n",
 332                                  net_dev->name);
 333                 goto out;
 334         }
 335
 336         if (primary_if->if_status != IF_ACTIVE) {
 337                 ret = seq_printf(seq, "BATMAN mesh %s "
 338                                  "disabled - primary interface not active\n",
 339                                  net_dev->name);
 340                 goto out;
 341         }
 342
 343         seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
 344
 345         rcu_read_lock();
 346         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 347                                  &bat_priv->softif_neigh_vids, list) {
 348                 seq_printf(seq, "     %-15s %s on vid: %d\n",
 349                            "Originator", "last-seen", softif_neigh_vid->vid);
 350
 351                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 352
 353                 hlist_for_each_entry_rcu(softif_neigh, node_tmp,
 354                                          &softif_neigh_vid->softif_neigh_list,
 355                                          list) {
 356                         last_seen_secs = jiffies_to_msecs(jiffies -
 357                                                 softif_neigh->last_seen) / 1000;
 358                         last_seen_msecs = jiffies_to_msecs(jiffies -
 359                                                 softif_neigh->last_seen) % 1000;
 360                         seq_printf(seq, "%s %pM  %3i.%03is\n",
 361                                    curr_softif_neigh == softif_neigh
 362                                    ? "=>" : "  ", softif_neigh->addr,
 363                                    last_seen_secs, last_seen_msecs);
 364                 }
 365
 366                 if (curr_softif_neigh)
 367                         softif_neigh_free_ref(curr_softif_neigh);
 368
 369                 seq_printf(seq, "\n");
 370         }
 371         rcu_read_unlock();
 372
 373 out:
 374         if (primary_if)
 375                 hardif_free_ref(primary_if);
 376         return ret;
 377 }
 378
 379 void softif_neigh_purge(struct bat_priv *bat_priv)
 380 {
 381         struct softif_neigh *softif_neigh, *curr_softif_neigh;
 382         struct softif_neigh_vid *softif_neigh_vid;
 383         struct hlist_node *node, *node_tmp, *node_tmp2;
 384         int do_deselect;
 385
 386         rcu_read_lock();
 387         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 388                                  &bat_priv->softif_neigh_vids, list) {
 389                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 390                         continue;
 391
 392                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 393                 do_deselect = 0;
 394
 395                 spin_lock_bh(&bat_priv->softif_neigh_lock);
 396                 hlist_for_each_entry_safe(softif_neigh, node_tmp, node_tmp2,
 397                                           &softif_neigh_vid->softif_neigh_list,
 398                                           list) {
 399                         if ((!time_after(jiffies, softif_neigh->last_seen +
 400                                 msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
 401                             (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
 402                                 continue;
 403
 404                         if (curr_softif_neigh == softif_neigh) {
 405                                 bat_dbg(DBG_ROUTES, bat_priv,
 406                                         "Current mesh exit point on vid: %d "
 407                                         "'%pM' vanished.\n",
 408                                         softif_neigh_vid->vid,
 409                                         softif_neigh->addr);
 410                                 do_deselect = 1;
 411                         }
 412
 413                         hlist_del_rcu(&softif_neigh->list);
 414                         softif_neigh_free_ref(softif_neigh);
 415                 }
 416                 spin_unlock_bh(&bat_priv->softif_neigh_lock);
 417
 418                 /* soft_neigh_vid_deselect() needs to acquire the
 419                  * softif_neigh_lock */
 420                 if (do_deselect)
 421                         softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
 422
 423                 if (curr_softif_neigh)
 424                         softif_neigh_free_ref(curr_softif_neigh);
 425
 426                 softif_neigh_vid_free_ref(softif_neigh_vid);
 427         }
 428         rcu_read_unlock();
 429
 430         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 431         hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
 432                                   &bat_priv->softif_neigh_vids, list) {
 433                 if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
 434                         continue;
 435
 436                 hlist_del_rcu(&softif_neigh_vid->list);
 437                 softif_neigh_vid_free_ref(softif_neigh_vid);
 438         }
 439         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 440
 441 }
 442
 443 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 444                                short vid)
 445 {
 446         struct bat_priv *bat_priv = netdev_priv(dev);
 447         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 448         struct batman_packet *batman_packet;
 449         struct softif_neigh *softif_neigh = NULL;
 450         struct hard_iface *primary_if = NULL;
 451         struct softif_neigh *curr_softif_neigh = NULL;
 452
 453         if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
 454                 batman_packet = (struct batman_packet *)
 455                                         (skb->data + ETH_HLEN + VLAN_HLEN);
 456         else
 457                 batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
 458
 459         if (batman_packet->version != COMPAT_VERSION)
 460                 goto out;
 461
 462         if (batman_packet->packet_type != BAT_PACKET)
 463                 goto out;
 464
 465         if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
 466                 goto out;
 467
 468         if (is_my_mac(batman_packet->orig))
 469                 goto out;
 470
 471         softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
 472         if (!softif_neigh)
 473                 goto out;
 474
 475         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 476         if (curr_softif_neigh == softif_neigh)
 477                 goto out;
 478
 479         primary_if = primary_if_get_selected(bat_priv);
 480         if (!primary_if)
 481                 goto out;
 482
 483         /* we got a neighbor but its mac is 'bigger' than ours  */
 484         if (memcmp(primary_if->net_dev->dev_addr,
 485                    softif_neigh->addr, ETH_ALEN) < 0)
 486                 goto out;
 487
 488         /* close own batX device and use softif_neigh as exit node */
 489         if (!curr_softif_neigh) {
 490                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 491                 goto out;
 492         }
 493
 494         /* switch to new 'smallest neighbor' */
 495         if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
 496                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 497
 498 out:
 499         kfree_skb(skb);
 500         if (softif_neigh)
 501                 softif_neigh_free_ref(softif_neigh);
 502         if (curr_softif_neigh)
 503                 softif_neigh_free_ref(curr_softif_neigh);
 504         if (primary_if)
 505                 hardif_free_ref(primary_if);
 506         return;
 507 }
 508
 509 static int interface_open(struct net_device *dev)
 510 {
 511         netif_start_queue(dev);
 512         return 0;
 513 }
 514
 515 static int interface_release(struct net_device *dev)
 516 {
 517         netif_stop_queue(dev);
 518         return 0;
 519 }
 520
 521 static struct net_device_stats *interface_stats(struct net_device *dev)
 522 {
 523         struct bat_priv *bat_priv = netdev_priv(dev);
 524         return &bat_priv->stats;
 525 }
 526
 527 static int interface_set_mac_addr(struct net_device *dev, void *p)
 528 {
 529         struct bat_priv *bat_priv = netdev_priv(dev);
 530         struct sockaddr *addr = p;
 531
 532         if (!is_valid_ether_addr(addr->sa_data))
 533                 return -EADDRNOTAVAIL;
 534
 535         /* only modify transtable if it has been initialised before */
 536         if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
 537                 tt_local_remove(bat_priv, dev->dev_addr,
 538                                 "mac address changed", false);
 539                 tt_local_add(dev, addr->sa_data);
 540         }
 541
 542         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 543         return 0;
 544 }
 545
 546 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 547 {
 548         /* check ranges */
 549         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
 550                 return -EINVAL;
 551
 552         dev->mtu = new_mtu;
 553
 554         return 0;
 555 }
 556
 557 static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 558 {
 559         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 560         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 561         struct hard_iface *primary_if = NULL;
 562         struct bcast_packet *bcast_packet;
 563         struct vlan_ethhdr *vhdr;
 564         struct softif_neigh *curr_softif_neigh = NULL;
 565         struct orig_node *orig_node = NULL;
 566         int data_len = skb->len, ret;
 567         short vid = -1;
 568         bool do_bcast;
 569
 570         if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
 571                 goto dropped;
 572
 573         soft_iface->trans_start = jiffies;
 574
 575         switch (ntohs(ethhdr->h_proto)) {
 576         case ETH_P_8021Q:
 577                 vhdr = (struct vlan_ethhdr *)skb->data;
 578                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 579
 580                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 581                         break;
 582
 583                 /* fall through */
 584         case ETH_P_BATMAN:
 585                 softif_batman_recv(skb, soft_iface, vid);
 586                 goto end;
 587         }
 588
 589         /**
 590          * if we have a another chosen mesh exit node in range
 591          * it will transport the packets to the mesh
 592          */
 593         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 594         if (curr_softif_neigh)
 595                 goto dropped;
 596
 597         /* Register the client MAC in the transtable */
 598         tt_local_add(soft_iface, ethhdr->h_source);
 599
 600         orig_node = transtable_search(bat_priv, ethhdr->h_dest);
 601         do_bcast = is_multicast_ether_addr(ethhdr->h_dest);
 602         if (do_bcast || (orig_node && orig_node->gw_flags)) {
 603                 ret = gw_is_target(bat_priv, skb, orig_node);
 604
 605                 if (ret < 0)
 606                         goto dropped;
 607
 608                 if (ret)
 609                         do_bcast = false;
 610         }
 611
 612         /* ethernet packet should be broadcasted */
 613         if (do_bcast) {
 614                 primary_if = primary_if_get_selected(bat_priv);
 615                 if (!primary_if)
 616                         goto dropped;
 617
 618                 if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 619                         goto dropped;
 620
 621                 bcast_packet = (struct bcast_packet *)skb->data;
 622                 bcast_packet->version = COMPAT_VERSION;
 623                 bcast_packet->ttl = TTL;
 624
 625                 /* batman packet type: broadcast */
 626                 bcast_packet->packet_type = BAT_BCAST;
 627
 628                 /* hw address of first interface is the orig mac because only
 629                  * this mac is known throughout the mesh */
 630                 memcpy(bcast_packet->orig,
 631                        primary_if->net_dev->dev_addr, ETH_ALEN);
 632
 633                 /* set broadcast sequence number */
 634                 bcast_packet->seqno =
 635                         htonl(atomic_inc_return(&bat_priv->bcast_seqno));
 636
 637                 add_bcast_packet_to_list(bat_priv, skb, 1);
 638
 639                 /* a copy is stored in the bcast list, therefore removing
 640                  * the original skb. */
 641                 kfree_skb(skb);
 642
 643         /* unicast packet */
 644         } else {
 645                 ret = unicast_send_skb(skb, bat_priv);
 646                 if (ret != 0)
 647                         goto dropped_freed;
 648         }
 649
 650         bat_priv->stats.tx_packets++;
 651         bat_priv->stats.tx_bytes += data_len;
 652         goto end;
 653
 654 dropped:
 655         kfree_skb(skb);
 656 dropped_freed:
 657         bat_priv->stats.tx_dropped++;
 658 end:
 659         if (curr_softif_neigh)
 660                 softif_neigh_free_ref(curr_softif_neigh);
 661         if (primary_if)
 662                 hardif_free_ref(primary_if);
 663         if (orig_node)
 664                 orig_node_free_ref(orig_node);
 665         return NETDEV_TX_OK;
 666 }
 667
 668 void interface_rx(struct net_device *soft_iface,
 669                   struct sk_buff *skb, struct hard_iface *recv_if,
 670                   int hdr_size)
 671 {
 672         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 673         struct unicast_packet *unicast_packet;
 674         struct ethhdr *ethhdr;
 675         struct vlan_ethhdr *vhdr;
 676         struct softif_neigh *curr_softif_neigh = NULL;
 677         short vid = -1;
 678         int ret;
 679
 680         /* check if enough space is available for pulling, and pull */
 681         if (!pskb_may_pull(skb, hdr_size))
 682                 goto dropped;
 683
 684         skb_pull_rcsum(skb, hdr_size);
 685         skb_reset_mac_header(skb);
 686
 687         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 688
 689         switch (ntohs(ethhdr->h_proto)) {
 690         case ETH_P_8021Q:
 691                 vhdr = (struct vlan_ethhdr *)skb->data;
 692                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 693
 694                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 695                         break;
 696
 697                 /* fall through */
 698         case ETH_P_BATMAN:
 699                 goto dropped;
 700         }
 701
 702         /**
 703          * if we have a another chosen mesh exit node in range
 704          * it will transport the packets to the non-mesh network
 705          */
 706         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 707         if (curr_softif_neigh) {
 708                 skb_push(skb, hdr_size);
 709                 unicast_packet = (struct unicast_packet *)skb->data;
 710
 711                 if ((unicast_packet->packet_type != BAT_UNICAST) &&
 712                     (unicast_packet->packet_type != BAT_UNICAST_FRAG))
 713                         goto dropped;
 714
 715                 skb_reset_mac_header(skb);
 716
 717                 memcpy(unicast_packet->dest,
 718                        curr_softif_neigh->addr, ETH_ALEN);
 719                 ret = route_unicast_packet(skb, recv_if);
 720                 if (ret == NET_RX_DROP)
 721                         goto dropped;
 722
 723                 goto out;
 724         }
 725
 726         /* skb->dev & skb->pkt_type are set here */
 727         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 728                 goto dropped;
 729         skb->protocol = eth_type_trans(skb, soft_iface);
 730
 731         /* should not be necessary anymore as we use skb_pull_rcsum()
 732          * TODO: please verify this and remove this TODO
 733          * -- Dec 21st 2009, Simon Wunderlich */
 734
 735 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 736
 737         bat_priv->stats.rx_packets++;
 738         bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
 739
 740         soft_iface->last_rx = jiffies;
 741
 742         netif_rx(skb);
 743         goto out;
 744
 745 dropped:
 746         kfree_skb(skb);
 747 out:
 748         if (curr_softif_neigh)
 749                 softif_neigh_free_ref(curr_softif_neigh);
 750         return;
 751 }
 752
 753 static const struct net_device_ops bat_netdev_ops = {
 754         .ndo_open = interface_open,
 755         .ndo_stop = interface_release,
 756         .ndo_get_stats = interface_stats,
 757         .ndo_set_mac_address = interface_set_mac_addr,
 758         .ndo_change_mtu = interface_change_mtu,
 759         .ndo_start_xmit = interface_tx,
 760         .ndo_validate_addr = eth_validate_addr
 761 };
 762
 763 static void interface_setup(struct net_device *dev)
 764 {
 765         struct bat_priv *priv = netdev_priv(dev);
 766         char dev_addr[ETH_ALEN];
 767
 768         ether_setup(dev);
 769
 770         dev->netdev_ops = &bat_netdev_ops;
 771         dev->destructor = free_netdev;
 772         dev->tx_queue_len = 0;
 773
 774         /**
 775          * can't call min_mtu, because the needed variables
 776          * have not been initialized yet
 777          */
 778         dev->mtu = ETH_DATA_LEN;
 779         /* reserve more space in the skbuff for our header */
 780         dev->hard_header_len = BAT_HEADER_LEN;
 781
 782         /* generate random address */
 783         random_ether_addr(dev_addr);
 784         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 785
 786         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 787
 788         memset(priv, 0, sizeof(*priv));
 789 }
 790
 791 struct net_device *softif_create(const char *name)
 792 {
 793         struct net_device *soft_iface;
 794         struct bat_priv *bat_priv;
 795         int ret;
 796
 797         soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
 798
 799         if (!soft_iface) {
 800                 pr_err("Unable to allocate the batman interface: %s\n", name);
 801                 goto out;
 802         }
 803
 804         ret = register_netdevice(soft_iface);
 805         if (ret < 0) {
 806                 pr_err("Unable to register the batman interface '%s': %i\n",
 807                        name, ret);
 808                 goto free_soft_iface;
 809         }
 810
 811         bat_priv = netdev_priv(soft_iface);
 812
 813         atomic_set(&bat_priv->aggregated_ogms, 1);
 814         atomic_set(&bat_priv->bonding, 0);
 815         atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
 816         atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
 817         atomic_set(&bat_priv->gw_sel_class, 20);
 818         atomic_set(&bat_priv->gw_bandwidth, 41);
 819         atomic_set(&bat_priv->orig_interval, 1000);
 820         atomic_set(&bat_priv->hop_penalty, 10);
 821         atomic_set(&bat_priv->log_level, 0);
 822         atomic_set(&bat_priv->fragmentation, 1);
 823         atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
 824         atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
 825
 826         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 827         atomic_set(&bat_priv->bcast_seqno, 1);
 828         atomic_set(&bat_priv->ttvn, 0);
 829         atomic_set(&bat_priv->tt_local_changes, 0);
 830         atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
 831
 832         bat_priv->tt_buff = NULL;
 833         bat_priv->tt_buff_len = 0;
 834         bat_priv->tt_poss_change = false;
 835
 836         bat_priv->primary_if = NULL;
 837         bat_priv->num_ifaces = 0;
 838
 839         ret = sysfs_add_meshif(soft_iface);
 840         if (ret < 0)
 841                 goto unreg_soft_iface;
 842
 843         ret = debugfs_add_meshif(soft_iface);
 844         if (ret < 0)
 845                 goto unreg_sysfs;
 846
 847         ret = mesh_init(soft_iface);
 848         if (ret < 0)
 849                 goto unreg_debugfs;
 850
 851         return soft_iface;
 852
 853 unreg_debugfs:
 854         debugfs_del_meshif(soft_iface);
 855 unreg_sysfs:
 856         sysfs_del_meshif(soft_iface);
 857 unreg_soft_iface:
 858         unregister_netdev(soft_iface);
 859         return NULL;
 860
 861 free_soft_iface:
 862         free_netdev(soft_iface);
 863 out:
 864         return NULL;
 865 }
 866
 867 void softif_destroy(struct net_device *soft_iface)
 868 {
 869         debugfs_del_meshif(soft_iface);
 870         sysfs_del_meshif(soft_iface);
 871         mesh_free(soft_iface);
 872         unregister_netdevice(soft_iface);
 873 }
 874
 875 int softif_is_valid(const struct net_device *net_dev)
 876 {
 877         if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
 878                 return 1;
 879
 880         return 0;
 881 }
 882
 883 /* ethtool */
 884 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 885 {
 886         cmd->supported = 0;
 887         cmd->advertising = 0;
 888         ethtool_cmd_speed_set(cmd, SPEED_10);
 889         cmd->duplex = DUPLEX_FULL;
 890         cmd->port = PORT_TP;
 891         cmd->phy_address = 0;
 892         cmd->transceiver = XCVR_INTERNAL;
 893         cmd->autoneg = AUTONEG_DISABLE;
 894         cmd->maxtxpkt = 0;
 895         cmd->maxrxpkt = 0;
 896
 897         return 0;
 898 }
 899
 900 static void bat_get_drvinfo(struct net_device *dev,
 901                             struct ethtool_drvinfo *info)
 902 {
 903         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 904         strcpy(info->version, SOURCE_VERSION);
 905         strcpy(info->fw_version, "N/A");
 906         strcpy(info->bus_info, "batman");
 907 }
 908
 909 static u32 bat_get_msglevel(struct net_device *dev)
 910 {
 911         return -EOPNOTSUPP;
 912 }
 913
 914 static void bat_set_msglevel(struct net_device *dev, u32 value)
 915 {
 916 }
 917
 918 static u32 bat_get_link(struct net_device *dev)
 919 {
 920         return 1;
 921 }