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 <linux/slab.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/if_vlan.h>
  37 #include "unicast.h"
  38
  39
  40 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  41 static void bat_get_drvinfo(struct net_device *dev,
  42                             struct ethtool_drvinfo *info);
  43 static u32 bat_get_msglevel(struct net_device *dev);
  44 static void bat_set_msglevel(struct net_device *dev, u32 value);
  45 static u32 bat_get_link(struct net_device *dev);
  46
  47 static const struct ethtool_ops bat_ethtool_ops = {
  48         .get_settings = bat_get_settings,
  49         .get_drvinfo = bat_get_drvinfo,
  50         .get_msglevel = bat_get_msglevel,
  51         .set_msglevel = bat_set_msglevel,
  52         .get_link = bat_get_link,
  53 };
  54
  55 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
  56 {
  57         int result;
  58
  59         /**
  60          * TODO: We must check if we can release all references to non-payload
  61          * data using skb_header_release in our skbs to allow skb_cow_header to
  62          * work optimally. This means that those skbs are not allowed to read
  63          * or write any data which is before the current position of skb->data
  64          * after that call and thus allow other skbs with the same data buffer
  65          * to write freely in that area.
  66          */
  67         result = skb_cow_head(skb, len);
  68         if (result < 0)
  69                 return result;
  70
  71         skb_push(skb, len);
  72         return 0;
  73 }
  74
  75 static void softif_neigh_free_rcu(struct rcu_head *rcu)
  76 {
  77         struct softif_neigh *softif_neigh;
  78
  79         softif_neigh = container_of(rcu, struct softif_neigh, rcu);
  80         kfree(softif_neigh);
  81 }
  82
  83 static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
  84 {
  85         if (atomic_dec_and_test(&softif_neigh->refcount))
  86                 call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
  87 }
  88
  89 static void softif_neigh_vid_free_rcu(struct rcu_head *rcu)
  90 {
  91         struct softif_neigh_vid *softif_neigh_vid;
  92         struct softif_neigh *softif_neigh;
  93         struct hlist_node *node, *node_tmp;
  94         struct bat_priv *bat_priv;
  95
  96         softif_neigh_vid = container_of(rcu, struct softif_neigh_vid, rcu);
  97         bat_priv = softif_neigh_vid->bat_priv;
  98
  99         spin_lock_bh(&bat_priv->softif_neigh_lock);
 100         hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
 101                                   &softif_neigh_vid->softif_neigh_list, list) {
 102                 hlist_del_rcu(&softif_neigh->list);
 103                 softif_neigh_free_ref(softif_neigh);
 104         }
 105         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 106
 107         kfree(softif_neigh_vid);
 108 }
 109
 110 static void softif_neigh_vid_free_ref(struct softif_neigh_vid *softif_neigh_vid)
 111 {
 112         if (atomic_dec_and_test(&softif_neigh_vid->refcount))
 113                 call_rcu(&softif_neigh_vid->rcu, softif_neigh_vid_free_rcu);
 114 }
 115
 116 static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
 117                                                      short vid)
 118 {
 119         struct softif_neigh_vid *softif_neigh_vid;
 120         struct hlist_node *node;
 121
 122         rcu_read_lock();
 123         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 124                                  &bat_priv->softif_neigh_vids, list) {
 125                 if (softif_neigh_vid->vid != vid)
 126                         continue;
 127
 128                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 129                         continue;
 130
 131                 goto out;
 132         }
 133
 134         softif_neigh_vid = kzalloc(sizeof(struct softif_neigh_vid),
 135                                    GFP_ATOMIC);
 136         if (!softif_neigh_vid)
 137                 goto out;
 138
 139         softif_neigh_vid->vid = vid;
 140         softif_neigh_vid->bat_priv = bat_priv;
 141
 142         /* initialize with 2 - caller decrements counter by one */
 143         atomic_set(&softif_neigh_vid->refcount, 2);
 144         INIT_HLIST_HEAD(&softif_neigh_vid->softif_neigh_list);
 145         INIT_HLIST_NODE(&softif_neigh_vid->list);
 146         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 147         hlist_add_head_rcu(&softif_neigh_vid->list,
 148                            &bat_priv->softif_neigh_vids);
 149         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 150
 151 out:
 152         rcu_read_unlock();
 153         return softif_neigh_vid;
 154 }
 155
 156 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 157                                              uint8_t *addr, short vid)
 158 {
 159         struct softif_neigh_vid *softif_neigh_vid;
 160         struct softif_neigh *softif_neigh = NULL;
 161         struct hlist_node *node;
 162
 163         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 164         if (!softif_neigh_vid)
 165                 goto out;
 166
 167         rcu_read_lock();
 168         hlist_for_each_entry_rcu(softif_neigh, node,
 169                                  &softif_neigh_vid->softif_neigh_list,
 170                                  list) {
 171                 if (!compare_eth(softif_neigh->addr, addr))
 172                         continue;
 173
 174                 if (!atomic_inc_not_zero(&softif_neigh->refcount))
 175                         continue;
 176
 177                 softif_neigh->last_seen = jiffies;
 178                 goto unlock;
 179         }
 180
 181         softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
 182         if (!softif_neigh)
 183                 goto unlock;
 184
 185         memcpy(softif_neigh->addr, addr, ETH_ALEN);
 186         softif_neigh->last_seen = jiffies;
 187         /* initialize with 2 - caller decrements counter by one */
 188         atomic_set(&softif_neigh->refcount, 2);
 189
 190         INIT_HLIST_NODE(&softif_neigh->list);
 191         spin_lock_bh(&bat_priv->softif_neigh_lock);
 192         hlist_add_head_rcu(&softif_neigh->list,
 193                            &softif_neigh_vid->softif_neigh_list);
 194         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 195
 196 unlock:
 197         rcu_read_unlock();
 198 out:
 199         if (softif_neigh_vid)
 200                 softif_neigh_vid_free_ref(softif_neigh_vid);
 201         return softif_neigh;
 202 }
 203
 204 static struct softif_neigh *softif_neigh_get_selected(
 205                                 struct softif_neigh_vid *softif_neigh_vid)
 206 {
 207         struct softif_neigh *softif_neigh;
 208
 209         rcu_read_lock();
 210         softif_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 211
 212         if (softif_neigh && !atomic_inc_not_zero(&softif_neigh->refcount))
 213                 softif_neigh = NULL;
 214
 215         rcu_read_unlock();
 216         return softif_neigh;
 217 }
 218
 219 static struct softif_neigh *softif_neigh_vid_get_selected(
 220                                                 struct bat_priv *bat_priv,
 221                                                 short vid)
 222 {
 223         struct softif_neigh_vid *softif_neigh_vid;
 224         struct softif_neigh *softif_neigh = NULL;
 225
 226         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 227         if (!softif_neigh_vid)
 228                 goto out;
 229
 230         softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 231 out:
 232         if (softif_neigh_vid)
 233                 softif_neigh_vid_free_ref(softif_neigh_vid);
 234         return softif_neigh;
 235 }
 236
 237 static void softif_neigh_vid_select(struct bat_priv *bat_priv,
 238                                     struct softif_neigh *new_neigh,
 239                                     short vid)
 240 {
 241         struct softif_neigh_vid *softif_neigh_vid;
 242         struct softif_neigh *curr_neigh;
 243
 244         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 245         if (!softif_neigh_vid)
 246                 goto out;
 247
 248         spin_lock_bh(&bat_priv->softif_neigh_lock);
 249
 250         if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
 251                 new_neigh = NULL;
 252
 253         curr_neigh = softif_neigh_vid->softif_neigh;
 254         rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
 255
 256         if ((curr_neigh) && (!new_neigh))
 257                 bat_dbg(DBG_ROUTES, bat_priv,
 258                         "Removing mesh exit point on vid: %d (prev: %pM).\n",
 259                         vid, curr_neigh->addr);
 260         else if ((curr_neigh) && (new_neigh))
 261                 bat_dbg(DBG_ROUTES, bat_priv,
 262                         "Changing mesh exit point on vid: %d from %pM "
 263                         "to %pM.\n", vid, curr_neigh->addr, new_neigh->addr);
 264         else if ((!curr_neigh) && (new_neigh))
 265                 bat_dbg(DBG_ROUTES, bat_priv,
 266                         "Setting mesh exit point on vid: %d to %pM.\n",
 267                         vid, new_neigh->addr);
 268
 269         if (curr_neigh)
 270                 softif_neigh_free_ref(curr_neigh);
 271
 272         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 273
 274 out:
 275         if (softif_neigh_vid)
 276                 softif_neigh_vid_free_ref(softif_neigh_vid);
 277 }
 278
 279 static void softif_neigh_vid_deselect(struct bat_priv *bat_priv,
 280                                       struct softif_neigh_vid *softif_neigh_vid)
 281 {
 282         struct softif_neigh *curr_neigh;
 283         struct softif_neigh *softif_neigh = NULL, *softif_neigh_tmp;
 284         struct hard_iface *primary_if = NULL;
 285         struct hlist_node *node;
 286
 287         primary_if = primary_if_get_selected(bat_priv);
 288         if (!primary_if)
 289                 goto out;
 290
 291         /* find new softif_neigh immediately to avoid temporary loops */
 292         rcu_read_lock();
 293         curr_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 294
 295         hlist_for_each_entry_rcu(softif_neigh_tmp, node,
 296                                  &softif_neigh_vid->softif_neigh_list,
 297                                  list) {
 298                 if (softif_neigh_tmp == curr_neigh)
 299                         continue;
 300
 301                 /* we got a neighbor but its mac is 'bigger' than ours  */
 302                 if (memcmp(primary_if->net_dev->dev_addr,
 303                            softif_neigh_tmp->addr, ETH_ALEN) < 0)
 304                         continue;
 305
 306                 if (!atomic_inc_not_zero(&softif_neigh_tmp->refcount))
 307                         continue;
 308
 309                 softif_neigh = softif_neigh_tmp;
 310                 goto unlock;
 311         }
 312
 313 unlock:
 314         rcu_read_unlock();
 315 out:
 316         softif_neigh_vid_select(bat_priv, softif_neigh, softif_neigh_vid->vid);
 317
 318         if (primary_if)
 319                 hardif_free_ref(primary_if);
 320         if (softif_neigh)
 321                 softif_neigh_free_ref(softif_neigh);
 322 }
 323
 324 int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 325 {
 326         struct net_device *net_dev = (struct net_device *)seq->private;
 327         struct bat_priv *bat_priv = netdev_priv(net_dev);
 328         struct softif_neigh_vid *softif_neigh_vid;
 329         struct softif_neigh *softif_neigh;
 330         struct hard_iface *primary_if;
 331         struct hlist_node *node, *node_tmp;
 332         struct softif_neigh *curr_softif_neigh;
 333         int ret = 0, last_seen_secs, last_seen_msecs;
 334
 335         primary_if = primary_if_get_selected(bat_priv);
 336         if (!primary_if) {
 337                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
 338                                  "please specify interfaces to enable it\n",
 339                                  net_dev->name);
 340                 goto out;
 341         }
 342
 343         if (primary_if->if_status != IF_ACTIVE) {
 344                 ret = seq_printf(seq, "BATMAN mesh %s "
 345                                  "disabled - primary interface not active\n",
 346                                  net_dev->name);
 347                 goto out;
 348         }
 349
 350         seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
 351
 352         rcu_read_lock();
 353         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 354                                  &bat_priv->softif_neigh_vids, list) {
 355                 seq_printf(seq, "     %-15s %s on vid: %d\n",
 356                            "Originator", "last-seen", softif_neigh_vid->vid);
 357
 358                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 359
 360                 hlist_for_each_entry_rcu(softif_neigh, node_tmp,
 361                                          &softif_neigh_vid->softif_neigh_list,
 362                                          list) {
 363                         last_seen_secs = jiffies_to_msecs(jiffies -
 364                                                 softif_neigh->last_seen) / 1000;
 365                         last_seen_msecs = jiffies_to_msecs(jiffies -
 366                                                 softif_neigh->last_seen) % 1000;
 367                         seq_printf(seq, "%s %pM  %3i.%03is\n",
 368                                    curr_softif_neigh == softif_neigh
 369                                    ? "=>" : "  ", softif_neigh->addr,
 370                                    last_seen_secs, last_seen_msecs);
 371                 }
 372
 373                 if (curr_softif_neigh)
 374                         softif_neigh_free_ref(curr_softif_neigh);
 375
 376                 seq_printf(seq, "\n");
 377         }
 378         rcu_read_unlock();
 379
 380 out:
 381         if (primary_if)
 382                 hardif_free_ref(primary_if);
 383         return ret;
 384 }
 385
 386 void softif_neigh_purge(struct bat_priv *bat_priv)
 387 {
 388         struct softif_neigh *softif_neigh, *curr_softif_neigh;
 389         struct softif_neigh_vid *softif_neigh_vid;
 390         struct hlist_node *node, *node_tmp, *node_tmp2;
 391         char do_deselect;
 392
 393         rcu_read_lock();
 394         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 395                                  &bat_priv->softif_neigh_vids, list) {
 396                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 397                         continue;
 398
 399                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 400                 do_deselect = 0;
 401
 402                 spin_lock_bh(&bat_priv->softif_neigh_lock);
 403                 hlist_for_each_entry_safe(softif_neigh, node_tmp, node_tmp2,
 404                                           &softif_neigh_vid->softif_neigh_list,
 405                                           list) {
 406                         if ((!time_after(jiffies, softif_neigh->last_seen +
 407                                 msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
 408                             (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
 409                                 continue;
 410
 411                         if (curr_softif_neigh == softif_neigh) {
 412                                 bat_dbg(DBG_ROUTES, bat_priv,
 413                                         "Current mesh exit point on vid: %d "
 414                                         "'%pM' vanished.\n",
 415                                         softif_neigh_vid->vid,
 416                                         softif_neigh->addr);
 417                                 do_deselect = 1;
 418                         }
 419
 420                         hlist_del_rcu(&softif_neigh->list);
 421                         softif_neigh_free_ref(softif_neigh);
 422                 }
 423                 spin_unlock_bh(&bat_priv->softif_neigh_lock);
 424
 425                 /* soft_neigh_vid_deselect() needs to acquire the
 426                  * softif_neigh_lock */
 427                 if (do_deselect)
 428                         softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
 429
 430                 if (curr_softif_neigh)
 431                         softif_neigh_free_ref(curr_softif_neigh);
 432
 433                 softif_neigh_vid_free_ref(softif_neigh_vid);
 434         }
 435         rcu_read_unlock();
 436
 437         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 438         hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
 439                                   &bat_priv->softif_neigh_vids, list) {
 440                 if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
 441                         continue;
 442
 443                 hlist_del_rcu(&softif_neigh_vid->list);
 444                 softif_neigh_vid_free_ref(softif_neigh_vid);
 445         }
 446         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 447
 448 }
 449
 450 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 451                                short vid)
 452 {
 453         struct bat_priv *bat_priv = netdev_priv(dev);
 454         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 455         struct batman_packet *batman_packet;
 456         struct softif_neigh *softif_neigh = NULL;
 457         struct hard_iface *primary_if = NULL;
 458         struct softif_neigh *curr_softif_neigh = NULL;
 459
 460         if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
 461                 batman_packet = (struct batman_packet *)
 462                                         (skb->data + ETH_HLEN + VLAN_HLEN);
 463         else
 464                 batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
 465
 466         if (batman_packet->version != COMPAT_VERSION)
 467                 goto out;
 468
 469         if (batman_packet->packet_type != BAT_PACKET)
 470                 goto out;
 471
 472         if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
 473                 goto out;
 474
 475         if (is_my_mac(batman_packet->orig))
 476                 goto out;
 477
 478         softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
 479         if (!softif_neigh)
 480                 goto out;
 481
 482         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 483         if (curr_softif_neigh == softif_neigh)
 484                 goto out;
 485
 486         primary_if = primary_if_get_selected(bat_priv);
 487         if (!primary_if)
 488                 goto out;
 489
 490         /* we got a neighbor but its mac is 'bigger' than ours  */
 491         if (memcmp(primary_if->net_dev->dev_addr,
 492                    softif_neigh->addr, ETH_ALEN) < 0)
 493                 goto out;
 494
 495         /* close own batX device and use softif_neigh as exit node */
 496         if (!curr_softif_neigh) {
 497                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 498                 goto out;
 499         }
 500
 501         /* switch to new 'smallest neighbor' */
 502         if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
 503                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 504
 505 out:
 506         kfree_skb(skb);
 507         if (softif_neigh)
 508                 softif_neigh_free_ref(softif_neigh);
 509         if (curr_softif_neigh)
 510                 softif_neigh_free_ref(curr_softif_neigh);
 511         if (primary_if)
 512                 hardif_free_ref(primary_if);
 513         return;
 514 }
 515
 516 static int interface_open(struct net_device *dev)
 517 {
 518         netif_start_queue(dev);
 519         return 0;
 520 }
 521
 522 static int interface_release(struct net_device *dev)
 523 {
 524         netif_stop_queue(dev);
 525         return 0;
 526 }
 527
 528 static struct net_device_stats *interface_stats(struct net_device *dev)
 529 {
 530         struct bat_priv *bat_priv = netdev_priv(dev);
 531         return &bat_priv->stats;
 532 }
 533
 534 static int interface_set_mac_addr(struct net_device *dev, void *p)
 535 {
 536         struct bat_priv *bat_priv = netdev_priv(dev);
 537         struct sockaddr *addr = p;
 538
 539         if (!is_valid_ether_addr(addr->sa_data))
 540                 return -EADDRNOTAVAIL;
 541
 542         /* only modify transtable if it has been initialised before */
 543         if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
 544                 tt_local_remove(bat_priv, dev->dev_addr,
 545                                  "mac address changed");
 546                 tt_local_add(dev, addr->sa_data);
 547         }
 548
 549         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 550         return 0;
 551 }
 552
 553 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 554 {
 555         /* check ranges */
 556         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
 557                 return -EINVAL;
 558
 559         dev->mtu = new_mtu;
 560
 561         return 0;
 562 }
 563
 564 int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 565 {
 566         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 567         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 568         struct hard_iface *primary_if = NULL;
 569         struct bcast_packet *bcast_packet;
 570         struct vlan_ethhdr *vhdr;
 571         struct softif_neigh *curr_softif_neigh = NULL;
 572         int data_len = skb->len, ret;
 573         short vid = -1;
 574         bool do_bcast = false;
 575
 576         if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
 577                 goto dropped;
 578
 579         soft_iface->trans_start = jiffies;
 580
 581         switch (ntohs(ethhdr->h_proto)) {
 582         case ETH_P_8021Q:
 583                 vhdr = (struct vlan_ethhdr *)skb->data;
 584                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 585
 586                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 587                         break;
 588
 589                 /* fall through */
 590         case ETH_P_BATMAN:
 591                 softif_batman_recv(skb, soft_iface, vid);
 592                 goto end;
 593         }
 594
 595         /**
 596          * if we have a another chosen mesh exit node in range
 597          * it will transport the packets to the mesh
 598          */
 599         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 600         if (curr_softif_neigh)
 601                 goto dropped;
 602
 603         /* TODO: check this for locks */
 604         tt_local_add(soft_iface, ethhdr->h_source);
 605
 606         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 607                 ret = gw_is_target(bat_priv, skb);
 608
 609                 if (ret < 0)
 610                         goto dropped;
 611
 612                 if (ret == 0)
 613                         do_bcast = true;
 614         }
 615
 616         /* ethernet packet should be broadcasted */
 617         if (do_bcast) {
 618                 primary_if = primary_if_get_selected(bat_priv);
 619                 if (!primary_if)
 620                         goto dropped;
 621
 622                 if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
 623                         goto dropped;
 624
 625                 bcast_packet = (struct bcast_packet *)skb->data;
 626                 bcast_packet->version = COMPAT_VERSION;
 627                 bcast_packet->ttl = TTL;
 628
 629                 /* batman packet type: broadcast */
 630                 bcast_packet->packet_type = BAT_BCAST;
 631
 632                 /* hw address of first interface is the orig mac because only
 633                  * this mac is known throughout the mesh */
 634                 memcpy(bcast_packet->orig,
 635                        primary_if->net_dev->dev_addr, ETH_ALEN);
 636
 637                 /* set broadcast sequence number */
 638                 bcast_packet->seqno =
 639                         htonl(atomic_inc_return(&bat_priv->bcast_seqno));
 640
 641                 add_bcast_packet_to_list(bat_priv, skb);
 642
 643                 /* a copy is stored in the bcast list, therefore removing
 644                  * the original skb. */
 645                 kfree_skb(skb);
 646
 647         /* unicast packet */
 648         } else {
 649                 ret = unicast_send_skb(skb, bat_priv);
 650                 if (ret != 0)
 651                         goto dropped_freed;
 652         }
 653
 654         bat_priv->stats.tx_packets++;
 655         bat_priv->stats.tx_bytes += data_len;
 656         goto end;
 657
 658 dropped:
 659         kfree_skb(skb);
 660 dropped_freed:
 661         bat_priv->stats.tx_dropped++;
 662 end:
 663         if (curr_softif_neigh)
 664                 softif_neigh_free_ref(curr_softif_neigh);
 665         if (primary_if)
 666                 hardif_free_ref(primary_if);
 667         return NETDEV_TX_OK;
 668 }
 669
 670 void interface_rx(struct net_device *soft_iface,
 671                   struct sk_buff *skb, struct hard_iface *recv_if,
 672                   int hdr_size)
 673 {
 674         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 675         struct unicast_packet *unicast_packet;
 676         struct ethhdr *ethhdr;
 677         struct vlan_ethhdr *vhdr;
 678         struct softif_neigh *curr_softif_neigh = NULL;
 679         short vid = -1;
 680         int ret;
 681
 682         /* check if enough space is available for pulling, and pull */
 683         if (!pskb_may_pull(skb, hdr_size))
 684                 goto dropped;
 685
 686         skb_pull_rcsum(skb, hdr_size);
 687         skb_reset_mac_header(skb);
 688
 689         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 690
 691         switch (ntohs(ethhdr->h_proto)) {
 692         case ETH_P_8021Q:
 693                 vhdr = (struct vlan_ethhdr *)skb->data;
 694                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 695
 696                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 697                         break;
 698
 699                 /* fall through */
 700         case ETH_P_BATMAN:
 701                 goto dropped;
 702         }
 703
 704         /**
 705          * if we have a another chosen mesh exit node in range
 706          * it will transport the packets to the non-mesh network
 707          */
 708         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 709         if (curr_softif_neigh) {
 710                 skb_push(skb, hdr_size);
 711                 unicast_packet = (struct unicast_packet *)skb->data;
 712
 713                 if ((unicast_packet->packet_type != BAT_UNICAST) &&
 714                     (unicast_packet->packet_type != BAT_UNICAST_FRAG))
 715                         goto dropped;
 716
 717                 skb_reset_mac_header(skb);
 718
 719                 memcpy(unicast_packet->dest,
 720                        curr_softif_neigh->addr, ETH_ALEN);
 721                 ret = route_unicast_packet(skb, recv_if);
 722                 if (ret == NET_RX_DROP)
 723                         goto dropped;
 724
 725                 goto out;
 726         }
 727
 728         /* skb->dev & skb->pkt_type are set here */
 729         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 730                 goto dropped;
 731         skb->protocol = eth_type_trans(skb, soft_iface);
 732
 733         /* should not be necessary anymore as we use skb_pull_rcsum()
 734          * TODO: please verify this and remove this TODO
 735          * -- Dec 21st 2009, Simon Wunderlich */
 736
 737 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 738
 739         bat_priv->stats.rx_packets++;
 740         bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
 741
 742         soft_iface->last_rx = jiffies;
 743
 744         netif_rx(skb);
 745         goto out;
 746
 747 dropped:
 748         kfree_skb(skb);
 749 out:
 750         if (curr_softif_neigh)
 751                 softif_neigh_free_ref(curr_softif_neigh);
 752         return;
 753 }
 754
 755 #ifdef HAVE_NET_DEVICE_OPS
 756 static const struct net_device_ops bat_netdev_ops = {
 757         .ndo_open = interface_open,
 758         .ndo_stop = interface_release,
 759         .ndo_get_stats = interface_stats,
 760         .ndo_set_mac_address = interface_set_mac_addr,
 761         .ndo_change_mtu = interface_change_mtu,
 762         .ndo_start_xmit = interface_tx,
 763         .ndo_validate_addr = eth_validate_addr
 764 };
 765 #endif
 766
 767 static void interface_setup(struct net_device *dev)
 768 {
 769         struct bat_priv *priv = netdev_priv(dev);
 770         char dev_addr[ETH_ALEN];
 771
 772         ether_setup(dev);
 773
 774 #ifdef HAVE_NET_DEVICE_OPS
 775         dev->netdev_ops = &bat_netdev_ops;
 776 #else
 777         dev->open = interface_open;
 778         dev->stop = interface_release;
 779         dev->get_stats = interface_stats;
 780         dev->set_mac_address = interface_set_mac_addr;
 781         dev->change_mtu = interface_change_mtu;
 782         dev->hard_start_xmit = interface_tx;
 783 #endif
 784         dev->destructor = free_netdev;
 785         dev->tx_queue_len = 0;
 786
 787         /**
 788          * can't call min_mtu, because the needed variables
 789          * have not been initialized yet
 790          */
 791         dev->mtu = ETH_DATA_LEN;
 792         /* reserve more space in the skbuff for our header */
 793         dev->hard_header_len = BAT_HEADER_LEN;
 794
 795         /* generate random address */
 796         random_ether_addr(dev_addr);
 797         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 798
 799         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 800
 801         memset(priv, 0, sizeof(struct bat_priv));
 802 }
 803
 804 struct net_device *softif_create(char *name)
 805 {
 806         struct net_device *soft_iface;
 807         struct bat_priv *bat_priv;
 808         int ret;
 809
 810         soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
 811                                    interface_setup);
 812
 813         if (!soft_iface) {
 814                 pr_err("Unable to allocate the batman interface: %s\n", name);
 815                 goto out;
 816         }
 817
 818         ret = register_netdevice(soft_iface);
 819         if (ret < 0) {
 820                 pr_err("Unable to register the batman interface '%s': %i\n",
 821                        name, ret);
 822                 goto free_soft_iface;
 823         }
 824
 825         bat_priv = netdev_priv(soft_iface);
 826
 827         atomic_set(&bat_priv->aggregated_ogms, 1);
 828         atomic_set(&bat_priv->bonding, 0);
 829         atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
 830         atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
 831         atomic_set(&bat_priv->gw_sel_class, 20);
 832         atomic_set(&bat_priv->gw_bandwidth, 41);
 833         atomic_set(&bat_priv->orig_interval, 1000);
 834         atomic_set(&bat_priv->hop_penalty, 10);
 835         atomic_set(&bat_priv->log_level, 0);
 836         atomic_set(&bat_priv->fragmentation, 1);
 837         atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
 838         atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
 839
 840         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 841         atomic_set(&bat_priv->bcast_seqno, 1);
 842         atomic_set(&bat_priv->tt_local_changed, 0);
 843
 844         bat_priv->primary_if = NULL;
 845         bat_priv->num_ifaces = 0;
 846
 847         ret = sysfs_add_meshif(soft_iface);
 848         if (ret < 0)
 849                 goto unreg_soft_iface;
 850
 851         ret = debugfs_add_meshif(soft_iface);
 852         if (ret < 0)
 853                 goto unreg_sysfs;
 854
 855         ret = mesh_init(soft_iface);
 856         if (ret < 0)
 857                 goto unreg_debugfs;
 858
 859         return soft_iface;
 860
 861 unreg_debugfs:
 862         debugfs_del_meshif(soft_iface);
 863 unreg_sysfs:
 864         sysfs_del_meshif(soft_iface);
 865 unreg_soft_iface:
 866         unregister_netdev(soft_iface);
 867         return NULL;
 868
 869 free_soft_iface:
 870         free_netdev(soft_iface);
 871 out:
 872         return NULL;
 873 }
 874
 875 void softif_destroy(struct net_device *soft_iface)
 876 {
 877         debugfs_del_meshif(soft_iface);
 878         sysfs_del_meshif(soft_iface);
 879         mesh_free(soft_iface);
 880         unregister_netdevice(soft_iface);
 881 }
 882
 883 int softif_is_valid(struct net_device *net_dev)
 884 {
 885 #ifdef HAVE_NET_DEVICE_OPS
 886         if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
 887                 return 1;
 888 #else
 889         if (net_dev->hard_start_xmit == interface_tx)
 890                 return 1;
 891 #endif
 892
 893         return 0;
 894 }
 895
 896 /* ethtool */
 897 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 898 {
 899         cmd->supported = 0;
 900         cmd->advertising = 0;
 901         ethtool_cmd_speed_set(cmd, SPEED_10);
 902         cmd->duplex = DUPLEX_FULL;
 903         cmd->port = PORT_TP;
 904         cmd->phy_address = 0;
 905         cmd->transceiver = XCVR_INTERNAL;
 906         cmd->autoneg = AUTONEG_DISABLE;
 907         cmd->maxtxpkt = 0;
 908         cmd->maxrxpkt = 0;
 909
 910         return 0;
 911 }
 912
 913 static void bat_get_drvinfo(struct net_device *dev,
 914                             struct ethtool_drvinfo *info)
 915 {
 916         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 917         strcpy(info->version, SOURCE_VERSION);
 918         strcpy(info->fw_version, "N/A");
 919         strcpy(info->bus_info, "batman");
 920 }
 921
 922 static u32 bat_get_msglevel(struct net_device *dev)
 923 {
 924         return -EOPNOTSUPP;
 925 }
 926
 927 static void bat_set_msglevel(struct net_device *dev, u32 value)
 928 {
 929 }
 930
 931 static u32 bat_get_link(struct net_device *dev)
 932 {
 933         return 1;
 934 }
 935