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