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 static u32 bat_get_rx_csum(struct net_device *dev);
  47 static int bat_set_rx_csum(struct net_device *dev, u32 data);
  48
  49 static const struct ethtool_ops bat_ethtool_ops = {
  50         .get_settings = bat_get_settings,
  51         .get_drvinfo = bat_get_drvinfo,
  52         .get_msglevel = bat_get_msglevel,
  53         .set_msglevel = bat_set_msglevel,
  54         .get_link = bat_get_link,
  55         .get_rx_csum = bat_get_rx_csum,
  56         .set_rx_csum = bat_set_rx_csum
  57 };
  58
  59 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
  60 {
  61         int result;
  62
  63         /**
  64          * TODO: We must check if we can release all references to non-payload
  65          * data using skb_header_release in our skbs to allow skb_cow_header to
  66          * work optimally. This means that those skbs are not allowed to read
  67          * or write any data which is before the current position of skb->data
  68          * after that call and thus allow other skbs with the same data buffer
  69          * to write freely in that area.
  70          */
  71         result = skb_cow_head(skb, len);
  72         if (result < 0)
  73                 return result;
  74
  75         skb_push(skb, len);
  76         return 0;
  77 }
  78
  79 static void softif_neigh_free_rcu(struct rcu_head *rcu)
  80 {
  81         struct softif_neigh *softif_neigh;
  82
  83         softif_neigh = container_of(rcu, struct softif_neigh, rcu);
  84         kfree(softif_neigh);
  85 }
  86
  87 static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
  88 {
  89         if (atomic_dec_and_test(&softif_neigh->refcount))
  90                 call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
  91 }
  92
  93 static void softif_neigh_vid_free_rcu(struct rcu_head *rcu)
  94 {
  95         struct softif_neigh_vid *softif_neigh_vid;
  96         struct softif_neigh *softif_neigh;
  97         struct hlist_node *node, *node_tmp;
  98         struct bat_priv *bat_priv;
  99
 100         softif_neigh_vid = container_of(rcu, struct softif_neigh_vid, rcu);
 101         bat_priv = softif_neigh_vid->bat_priv;
 102
 103         spin_lock_bh(&bat_priv->softif_neigh_lock);
 104         hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
 105                                   &softif_neigh_vid->softif_neigh_list, list) {
 106                 hlist_del_rcu(&softif_neigh->list);
 107                 softif_neigh_free_ref(softif_neigh);
 108         }
 109         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 110
 111         kfree(softif_neigh_vid);
 112 }
 113
 114 static void softif_neigh_vid_free_ref(struct softif_neigh_vid *softif_neigh_vid)
 115 {
 116         if (atomic_dec_and_test(&softif_neigh_vid->refcount))
 117                 call_rcu(&softif_neigh_vid->rcu, softif_neigh_vid_free_rcu);
 118 }
 119
 120 static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
 121                                                      short vid)
 122 {
 123         struct softif_neigh_vid *softif_neigh_vid;
 124         struct hlist_node *node;
 125
 126         rcu_read_lock();
 127         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 128                                  &bat_priv->softif_neigh_vids, list) {
 129                 if (softif_neigh_vid->vid != vid)
 130                         continue;
 131
 132                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 133                         continue;
 134
 135                 goto out;
 136         }
 137
 138         softif_neigh_vid = kzalloc(sizeof(struct softif_neigh_vid),
 139                                    GFP_ATOMIC);
 140         if (!softif_neigh_vid)
 141                 goto out;
 142
 143         softif_neigh_vid->vid = vid;
 144         softif_neigh_vid->bat_priv = bat_priv;
 145
 146         /* initialize with 2 - caller decrements counter by one */
 147         atomic_set(&softif_neigh_vid->refcount, 2);
 148         INIT_HLIST_HEAD(&softif_neigh_vid->softif_neigh_list);
 149         INIT_HLIST_NODE(&softif_neigh_vid->list);
 150         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 151         hlist_add_head_rcu(&softif_neigh_vid->list,
 152                            &bat_priv->softif_neigh_vids);
 153         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 154
 155 out:
 156         rcu_read_unlock();
 157         return softif_neigh_vid;
 158 }
 159
 160 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 161                                              uint8_t *addr, short vid)
 162 {
 163         struct softif_neigh_vid *softif_neigh_vid;
 164         struct softif_neigh *softif_neigh = NULL;
 165         struct hlist_node *node;
 166
 167         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 168         if (!softif_neigh_vid)
 169                 goto out;
 170
 171         rcu_read_lock();
 172         hlist_for_each_entry_rcu(softif_neigh, node,
 173                                  &softif_neigh_vid->softif_neigh_list,
 174                                  list) {
 175                 if (!compare_eth(softif_neigh->addr, addr))
 176                         continue;
 177
 178                 if (!atomic_inc_not_zero(&softif_neigh->refcount))
 179                         continue;
 180
 181                 softif_neigh->last_seen = jiffies;
 182                 goto unlock;
 183         }
 184
 185         softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
 186         if (!softif_neigh)
 187                 goto unlock;
 188
 189         memcpy(softif_neigh->addr, addr, ETH_ALEN);
 190         softif_neigh->last_seen = jiffies;
 191         /* initialize with 2 - caller decrements counter by one */
 192         atomic_set(&softif_neigh->refcount, 2);
 193
 194         INIT_HLIST_NODE(&softif_neigh->list);
 195         spin_lock_bh(&bat_priv->softif_neigh_lock);
 196         hlist_add_head_rcu(&softif_neigh->list,
 197                            &softif_neigh_vid->softif_neigh_list);
 198         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 199
 200 unlock:
 201         rcu_read_unlock();
 202 out:
 203         if (softif_neigh_vid)
 204                 softif_neigh_vid_free_ref(softif_neigh_vid);
 205         return softif_neigh;
 206 }
 207
 208 static struct softif_neigh *softif_neigh_get_selected(
 209                                 struct softif_neigh_vid *softif_neigh_vid)
 210 {
 211         struct softif_neigh *softif_neigh;
 212
 213         rcu_read_lock();
 214         softif_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 215
 216         if (softif_neigh && !atomic_inc_not_zero(&softif_neigh->refcount))
 217                 softif_neigh = NULL;
 218
 219         rcu_read_unlock();
 220         return softif_neigh;
 221 }
 222
 223 static struct softif_neigh *softif_neigh_vid_get_selected(
 224                                                 struct bat_priv *bat_priv,
 225                                                 short vid)
 226 {
 227         struct softif_neigh_vid *softif_neigh_vid;
 228         struct softif_neigh *softif_neigh = NULL;
 229
 230         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 231         if (!softif_neigh_vid)
 232                 goto out;
 233
 234         softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 235 out:
 236         if (softif_neigh_vid)
 237                 softif_neigh_vid_free_ref(softif_neigh_vid);
 238         return softif_neigh;
 239 }
 240
 241 static void softif_neigh_vid_select(struct bat_priv *bat_priv,
 242                                     struct softif_neigh *new_neigh,
 243                                     short vid)
 244 {
 245         struct softif_neigh_vid *softif_neigh_vid;
 246         struct softif_neigh *curr_neigh;
 247
 248         softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
 249         if (!softif_neigh_vid)
 250                 goto out;
 251
 252         spin_lock_bh(&bat_priv->softif_neigh_lock);
 253
 254         if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
 255                 new_neigh = NULL;
 256
 257         curr_neigh = softif_neigh_vid->softif_neigh;
 258         rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
 259
 260         if ((curr_neigh) && (!new_neigh))
 261                 bat_dbg(DBG_ROUTES, bat_priv,
 262                         "Removing mesh exit point on vid: %d (prev: %pM).\n",
 263                         vid, curr_neigh->addr);
 264         else if ((curr_neigh) && (new_neigh))
 265                 bat_dbg(DBG_ROUTES, bat_priv,
 266                         "Changing mesh exit point on vid: %d from %pM "
 267                         "to %pM.\n", vid, curr_neigh->addr, new_neigh->addr);
 268         else if ((!curr_neigh) && (new_neigh))
 269                 bat_dbg(DBG_ROUTES, bat_priv,
 270                         "Setting mesh exit point on vid: %d to %pM.\n",
 271                         vid, new_neigh->addr);
 272
 273         if (curr_neigh)
 274                 softif_neigh_free_ref(curr_neigh);
 275
 276         spin_unlock_bh(&bat_priv->softif_neigh_lock);
 277
 278 out:
 279         if (softif_neigh_vid)
 280                 softif_neigh_vid_free_ref(softif_neigh_vid);
 281 }
 282
 283 static void softif_neigh_vid_deselect(struct bat_priv *bat_priv,
 284                                       struct softif_neigh_vid *softif_neigh_vid)
 285 {
 286         struct softif_neigh *curr_neigh;
 287         struct softif_neigh *softif_neigh = NULL, *softif_neigh_tmp;
 288         struct hard_iface *primary_if = NULL;
 289         struct hlist_node *node;
 290
 291         primary_if = primary_if_get_selected(bat_priv);
 292         if (!primary_if)
 293                 goto out;
 294
 295         /* find new softif_neigh immediately to avoid temporary loops */
 296         rcu_read_lock();
 297         curr_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
 298
 299         hlist_for_each_entry_rcu(softif_neigh_tmp, node,
 300                                  &softif_neigh_vid->softif_neigh_list,
 301                                  list) {
 302                 if (softif_neigh_tmp == curr_neigh)
 303                         continue;
 304
 305                 /* we got a neighbor but its mac is 'bigger' than ours  */
 306                 if (memcmp(primary_if->net_dev->dev_addr,
 307                            softif_neigh_tmp->addr, ETH_ALEN) < 0)
 308                         continue;
 309
 310                 if (!atomic_inc_not_zero(&softif_neigh_tmp->refcount))
 311                         continue;
 312
 313                 softif_neigh = softif_neigh_tmp;
 314                 goto unlock;
 315         }
 316
 317 unlock:
 318         rcu_read_unlock();
 319 out:
 320         softif_neigh_vid_select(bat_priv, softif_neigh, softif_neigh_vid->vid);
 321
 322         if (primary_if)
 323                 hardif_free_ref(primary_if);
 324         if (softif_neigh)
 325                 softif_neigh_free_ref(softif_neigh);
 326 }
 327
 328 int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 329 {
 330         struct net_device *net_dev = (struct net_device *)seq->private;
 331         struct bat_priv *bat_priv = netdev_priv(net_dev);
 332         struct softif_neigh_vid *softif_neigh_vid;
 333         struct softif_neigh *softif_neigh;
 334         struct hard_iface *primary_if;
 335         struct hlist_node *node, *node_tmp;
 336         struct softif_neigh *curr_softif_neigh;
 337         int ret = 0, last_seen_secs, last_seen_msecs;
 338
 339         primary_if = primary_if_get_selected(bat_priv);
 340         if (!primary_if) {
 341                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
 342                                  "please specify interfaces to enable it\n",
 343                                  net_dev->name);
 344                 goto out;
 345         }
 346
 347         if (primary_if->if_status != IF_ACTIVE) {
 348                 ret = seq_printf(seq, "BATMAN mesh %s "
 349                                  "disabled - primary interface not active\n",
 350                                  net_dev->name);
 351                 goto out;
 352         }
 353
 354         seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
 355
 356         rcu_read_lock();
 357         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 358                                  &bat_priv->softif_neigh_vids, list) {
 359                 seq_printf(seq, "     %-15s %s on vid: %d\n",
 360                            "Originator", "last-seen", softif_neigh_vid->vid);
 361
 362                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 363
 364                 hlist_for_each_entry_rcu(softif_neigh, node_tmp,
 365                                          &softif_neigh_vid->softif_neigh_list,
 366                                          list) {
 367                         last_seen_secs = jiffies_to_msecs(jiffies -
 368                                                 softif_neigh->last_seen) / 1000;
 369                         last_seen_msecs = jiffies_to_msecs(jiffies -
 370                                                 softif_neigh->last_seen) % 1000;
 371                         seq_printf(seq, "%s %pM  %3i.%03is\n",
 372                                    curr_softif_neigh == softif_neigh
 373                                    ? "=>" : "  ", softif_neigh->addr,
 374                                    last_seen_secs, last_seen_msecs);
 375                 }
 376
 377                 if (curr_softif_neigh)
 378                         softif_neigh_free_ref(curr_softif_neigh);
 379
 380                 seq_printf(seq, "\n");
 381         }
 382         rcu_read_unlock();
 383
 384 out:
 385         if (primary_if)
 386                 hardif_free_ref(primary_if);
 387         return ret;
 388 }
 389
 390 void softif_neigh_purge(struct bat_priv *bat_priv)
 391 {
 392         struct softif_neigh *softif_neigh, *curr_softif_neigh;
 393         struct softif_neigh_vid *softif_neigh_vid;
 394         struct hlist_node *node, *node_tmp, *node_tmp2;
 395         char do_deselect;
 396
 397         rcu_read_lock();
 398         hlist_for_each_entry_rcu(softif_neigh_vid, node,
 399                                  &bat_priv->softif_neigh_vids, list) {
 400                 if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
 401                         continue;
 402
 403                 curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
 404                 do_deselect = 0;
 405
 406                 spin_lock_bh(&bat_priv->softif_neigh_lock);
 407                 hlist_for_each_entry_safe(softif_neigh, node_tmp, node_tmp2,
 408                                           &softif_neigh_vid->softif_neigh_list,
 409                                           list) {
 410                         if ((!time_after(jiffies, softif_neigh->last_seen +
 411                                 msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
 412                             (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
 413                                 continue;
 414
 415                         if (curr_softif_neigh == softif_neigh) {
 416                                 bat_dbg(DBG_ROUTES, bat_priv,
 417                                         "Current mesh exit point on vid: %d "
 418                                         "'%pM' vanished.\n",
 419                                         softif_neigh_vid->vid,
 420                                         softif_neigh->addr);
 421                                 do_deselect = 1;
 422                         }
 423
 424                         hlist_del_rcu(&softif_neigh->list);
 425                         softif_neigh_free_ref(softif_neigh);
 426                 }
 427                 spin_unlock_bh(&bat_priv->softif_neigh_lock);
 428
 429                 /* soft_neigh_vid_deselect() needs to acquire the
 430                  * softif_neigh_lock */
 431                 if (do_deselect)
 432                         softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
 433
 434                 if (curr_softif_neigh)
 435                         softif_neigh_free_ref(curr_softif_neigh);
 436
 437                 softif_neigh_vid_free_ref(softif_neigh_vid);
 438         }
 439         rcu_read_unlock();
 440
 441         spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
 442         hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
 443                                   &bat_priv->softif_neigh_vids, list) {
 444                 if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
 445                         continue;
 446
 447                 hlist_del_rcu(&softif_neigh_vid->list);
 448                 softif_neigh_vid_free_ref(softif_neigh_vid);
 449         }
 450         spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
 451
 452 }
 453
 454 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 455                                short vid)
 456 {
 457         struct bat_priv *bat_priv = netdev_priv(dev);
 458         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 459         struct batman_packet *batman_packet;
 460         struct softif_neigh *softif_neigh = NULL;
 461         struct hard_iface *primary_if = NULL;
 462         struct softif_neigh *curr_softif_neigh = NULL;
 463
 464         if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
 465                 batman_packet = (struct batman_packet *)
 466                                         (skb->data + ETH_HLEN + VLAN_HLEN);
 467         else
 468                 batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
 469
 470         if (batman_packet->version != COMPAT_VERSION)
 471                 goto out;
 472
 473         if (batman_packet->packet_type != BAT_PACKET)
 474                 goto out;
 475
 476         if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
 477                 goto out;
 478
 479         if (is_my_mac(batman_packet->orig))
 480                 goto out;
 481
 482         softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
 483         if (!softif_neigh)
 484                 goto out;
 485
 486         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 487         if (curr_softif_neigh == softif_neigh)
 488                 goto out;
 489
 490         primary_if = primary_if_get_selected(bat_priv);
 491         if (!primary_if)
 492                 goto out;
 493
 494         /* we got a neighbor but its mac is 'bigger' than ours  */
 495         if (memcmp(primary_if->net_dev->dev_addr,
 496                    softif_neigh->addr, ETH_ALEN) < 0)
 497                 goto out;
 498
 499         /* close own batX device and use softif_neigh as exit node */
 500         if (!curr_softif_neigh) {
 501                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 502                 goto out;
 503         }
 504
 505         /* switch to new 'smallest neighbor' */
 506         if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
 507                 softif_neigh_vid_select(bat_priv, softif_neigh, vid);
 508
 509 out:
 510         kfree_skb(skb);
 511         if (softif_neigh)
 512                 softif_neigh_free_ref(softif_neigh);
 513         if (curr_softif_neigh)
 514                 softif_neigh_free_ref(curr_softif_neigh);
 515         if (primary_if)
 516                 hardif_free_ref(primary_if);
 517         return;
 518 }
 519
 520 static int interface_open(struct net_device *dev)
 521 {
 522         netif_start_queue(dev);
 523         return 0;
 524 }
 525
 526 static int interface_release(struct net_device *dev)
 527 {
 528         netif_stop_queue(dev);
 529         return 0;
 530 }
 531
 532 static struct net_device_stats *interface_stats(struct net_device *dev)
 533 {
 534         struct bat_priv *bat_priv = netdev_priv(dev);
 535         return &bat_priv->stats;
 536 }
 537
 538 static int interface_set_mac_addr(struct net_device *dev, void *p)
 539 {
 540         struct bat_priv *bat_priv = netdev_priv(dev);
 541         struct sockaddr *addr = p;
 542
 543         if (!is_valid_ether_addr(addr->sa_data))
 544                 return -EADDRNOTAVAIL;
 545
 546         /* only modify hna-table if it has been initialised before */
 547         if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
 548                 hna_local_remove(bat_priv, dev->dev_addr,
 549                                  "mac address changed");
 550                 hna_local_add(dev, addr->sa_data);
 551         }
 552
 553         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 554         return 0;
 555 }
 556
 557 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 558 {
 559         /* check ranges */
 560         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
 561                 return -EINVAL;
 562
 563         dev->mtu = new_mtu;
 564
 565         return 0;
 566 }
 567
 568 int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 569 {
 570         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 571         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 572         struct hard_iface *primary_if = NULL;
 573         struct bcast_packet *bcast_packet;
 574         struct vlan_ethhdr *vhdr;
 575         struct softif_neigh *curr_softif_neigh = NULL;
 576         int data_len = skb->len, ret;
 577         short vid = -1;
 578         bool do_bcast = false;
 579
 580         if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
 581                 goto dropped;
 582
 583         soft_iface->trans_start = jiffies;
 584
 585         switch (ntohs(ethhdr->h_proto)) {
 586         case ETH_P_8021Q:
 587                 vhdr = (struct vlan_ethhdr *)skb->data;
 588                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 589
 590                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 591                         break;
 592
 593                 /* fall through */
 594         case ETH_P_BATMAN:
 595                 softif_batman_recv(skb, soft_iface, vid);
 596                 goto end;
 597         }
 598
 599         /**
 600          * if we have a another chosen mesh exit node in range
 601          * it will transport the packets to the mesh
 602          */
 603         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 604         if (curr_softif_neigh)
 605                 goto dropped;
 606
 607         /* TODO: check this for locks */
 608         hna_local_add(soft_iface, ethhdr->h_source);
 609
 610         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 611                 ret = gw_is_target(bat_priv, skb);
 612
 613                 if (ret < 0)
 614                         goto dropped;
 615
 616                 if (ret == 0)
 617                         do_bcast = true;
 618         }
 619
 620         /* ethernet packet should be broadcasted */
 621         if (do_bcast) {
 622                 primary_if = primary_if_get_selected(bat_priv);
 623                 if (!primary_if)
 624                         goto dropped;
 625
 626                 if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
 627                         goto dropped;
 628
 629                 bcast_packet = (struct bcast_packet *)skb->data;
 630                 bcast_packet->version = COMPAT_VERSION;
 631                 bcast_packet->ttl = TTL;
 632
 633                 /* batman packet type: broadcast */
 634                 bcast_packet->packet_type = BAT_BCAST;
 635
 636                 /* hw address of first interface is the orig mac because only
 637                  * this mac is known throughout the mesh */
 638                 memcpy(bcast_packet->orig,
 639                        primary_if->net_dev->dev_addr, ETH_ALEN);
 640
 641                 /* set broadcast sequence number */
 642                 bcast_packet->seqno =
 643                         htonl(atomic_inc_return(&bat_priv->bcast_seqno));
 644
 645                 add_bcast_packet_to_list(bat_priv, skb);
 646
 647                 /* a copy is stored in the bcast list, therefore removing
 648                  * the original skb. */
 649                 kfree_skb(skb);
 650
 651         /* unicast packet */
 652         } else {
 653                 ret = unicast_send_skb(skb, bat_priv);
 654                 if (ret != 0)
 655                         goto dropped_freed;
 656         }
 657
 658         bat_priv->stats.tx_packets++;
 659         bat_priv->stats.tx_bytes += data_len;
 660         goto end;
 661
 662 dropped:
 663         kfree_skb(skb);
 664 dropped_freed:
 665         bat_priv->stats.tx_dropped++;
 666 end:
 667         if (curr_softif_neigh)
 668                 softif_neigh_free_ref(curr_softif_neigh);
 669         if (primary_if)
 670                 hardif_free_ref(primary_if);
 671         return NETDEV_TX_OK;
 672 }
 673
 674 void interface_rx(struct net_device *soft_iface,
 675                   struct sk_buff *skb, struct hard_iface *recv_if,
 676                   int hdr_size)
 677 {
 678         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 679         struct unicast_packet *unicast_packet;
 680         struct ethhdr *ethhdr;
 681         struct vlan_ethhdr *vhdr;
 682         struct softif_neigh *curr_softif_neigh = NULL;
 683         short vid = -1;
 684         int ret;
 685
 686         /* check if enough space is available for pulling, and pull */
 687         if (!pskb_may_pull(skb, hdr_size))
 688                 goto dropped;
 689
 690         skb_pull_rcsum(skb, hdr_size);
 691         skb_reset_mac_header(skb);
 692
 693         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 694
 695         switch (ntohs(ethhdr->h_proto)) {
 696         case ETH_P_8021Q:
 697                 vhdr = (struct vlan_ethhdr *)skb->data;
 698                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 699
 700                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 701                         break;
 702
 703                 /* fall through */
 704         case ETH_P_BATMAN:
 705                 goto dropped;
 706         }
 707
 708         /**
 709          * if we have a another chosen mesh exit node in range
 710          * it will transport the packets to the non-mesh network
 711          */
 712         curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
 713         if (curr_softif_neigh) {
 714                 skb_push(skb, hdr_size);
 715                 unicast_packet = (struct unicast_packet *)skb->data;
 716
 717                 if ((unicast_packet->packet_type != BAT_UNICAST) &&
 718                     (unicast_packet->packet_type != BAT_UNICAST_FRAG))
 719                         goto dropped;
 720
 721                 skb_reset_mac_header(skb);
 722
 723                 memcpy(unicast_packet->dest,
 724                        curr_softif_neigh->addr, ETH_ALEN);
 725                 ret = route_unicast_packet(skb, recv_if);
 726                 if (ret == NET_RX_DROP)
 727                         goto dropped;
 728
 729                 goto out;
 730         }
 731
 732         /* skb->dev & skb->pkt_type are set here */
 733         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 734                 goto dropped;
 735         skb->protocol = eth_type_trans(skb, soft_iface);
 736
 737         /* should not be neccesary anymore as we use skb_pull_rcsum()
 738          * TODO: please verify this and remove this TODO
 739          * -- Dec 21st 2009, Simon Wunderlich */
 740
 741 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 742
 743         bat_priv->stats.rx_packets++;
 744         bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
 745
 746         soft_iface->last_rx = jiffies;
 747
 748         netif_rx(skb);
 749         goto out;
 750
 751 dropped:
 752         kfree_skb(skb);
 753 out:
 754         if (curr_softif_neigh)
 755                 softif_neigh_free_ref(curr_softif_neigh);
 756         return;
 757 }
 758
 759 #ifdef HAVE_NET_DEVICE_OPS
 760 static const struct net_device_ops bat_netdev_ops = {
 761         .ndo_open = interface_open,
 762         .ndo_stop = interface_release,
 763         .ndo_get_stats = interface_stats,
 764         .ndo_set_mac_address = interface_set_mac_addr,
 765         .ndo_change_mtu = interface_change_mtu,
 766         .ndo_start_xmit = interface_tx,
 767         .ndo_validate_addr = eth_validate_addr
 768 };
 769 #endif
 770
 771 static void interface_setup(struct net_device *dev)
 772 {
 773         struct bat_priv *priv = netdev_priv(dev);
 774         char dev_addr[ETH_ALEN];
 775
 776         ether_setup(dev);
 777
 778 #ifdef HAVE_NET_DEVICE_OPS
 779         dev->netdev_ops = &bat_netdev_ops;
 780 #else
 781         dev->open = interface_open;
 782         dev->stop = interface_release;
 783         dev->get_stats = interface_stats;
 784         dev->set_mac_address = interface_set_mac_addr;
 785         dev->change_mtu = interface_change_mtu;
 786         dev->hard_start_xmit = interface_tx;
 787 #endif
 788         dev->destructor = free_netdev;
 789         dev->tx_queue_len = 0;
 790
 791         /**
 792          * can't call min_mtu, because the needed variables
 793          * have not been initialized yet
 794          */
 795         dev->mtu = ETH_DATA_LEN;
 796         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 797                                                 * skbuff for our header */
 798
 799         /* generate random address */
 800         random_ether_addr(dev_addr);
 801         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 802
 803         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 804
 805         memset(priv, 0, sizeof(struct bat_priv));
 806 }
 807
 808 struct net_device *softif_create(char *name)
 809 {
 810         struct net_device *soft_iface;
 811         struct bat_priv *bat_priv;
 812         int ret;
 813
 814         soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
 815                                    interface_setup);
 816
 817         if (!soft_iface) {
 818                 pr_err("Unable to allocate the batman interface: %s\n", name);
 819                 goto out;
 820         }
 821
 822         ret = register_netdevice(soft_iface);
 823         if (ret < 0) {
 824                 pr_err("Unable to register the batman interface '%s': %i\n",
 825                        name, ret);
 826                 goto free_soft_iface;
 827         }
 828
 829         bat_priv = netdev_priv(soft_iface);
 830
 831         atomic_set(&bat_priv->aggregated_ogms, 1);
 832         atomic_set(&bat_priv->bonding, 0);
 833         atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
 834         atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
 835         atomic_set(&bat_priv->gw_sel_class, 20);
 836         atomic_set(&bat_priv->gw_bandwidth, 41);
 837         atomic_set(&bat_priv->orig_interval, 1000);
 838         atomic_set(&bat_priv->hop_penalty, 10);
 839         atomic_set(&bat_priv->log_level, 0);
 840         atomic_set(&bat_priv->fragmentation, 1);
 841         atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
 842         atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
 843
 844         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 845         atomic_set(&bat_priv->bcast_seqno, 1);
 846         atomic_set(&bat_priv->hna_local_changed, 0);
 847
 848         bat_priv->primary_if = NULL;
 849         bat_priv->num_ifaces = 0;
 850
 851         ret = sysfs_add_meshif(soft_iface);
 852         if (ret < 0)
 853                 goto unreg_soft_iface;
 854
 855         ret = debugfs_add_meshif(soft_iface);
 856         if (ret < 0)
 857                 goto unreg_sysfs;
 858
 859         ret = mesh_init(soft_iface);
 860         if (ret < 0)
 861                 goto unreg_debugfs;
 862
 863         return soft_iface;
 864
 865 unreg_debugfs:
 866         debugfs_del_meshif(soft_iface);
 867 unreg_sysfs:
 868         sysfs_del_meshif(soft_iface);
 869 unreg_soft_iface:
 870         unregister_netdev(soft_iface);
 871         return NULL;
 872
 873 free_soft_iface:
 874         free_netdev(soft_iface);
 875 out:
 876         return NULL;
 877 }
 878
 879 void softif_destroy(struct net_device *soft_iface)
 880 {
 881         debugfs_del_meshif(soft_iface);
 882         sysfs_del_meshif(soft_iface);
 883         mesh_free(soft_iface);
 884         unregister_netdevice(soft_iface);
 885 }
 886
 887 int softif_is_valid(struct net_device *net_dev)
 888 {
 889 #ifdef HAVE_NET_DEVICE_OPS
 890         if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
 891                 return 1;
 892 #else
 893         if (net_dev->hard_start_xmit == interface_tx)
 894                 return 1;
 895 #endif
 896
 897         return 0;
 898 }
 899
 900 /* ethtool */
 901 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 902 {
 903         cmd->supported = 0;
 904         cmd->advertising = 0;
 905         cmd->speed = SPEED_10;
 906         cmd->duplex = DUPLEX_FULL;
 907         cmd->port = PORT_TP;
 908         cmd->phy_address = 0;
 909         cmd->transceiver = XCVR_INTERNAL;
 910         cmd->autoneg = AUTONEG_DISABLE;
 911         cmd->maxtxpkt = 0;
 912         cmd->maxrxpkt = 0;
 913
 914         return 0;
 915 }
 916
 917 static void bat_get_drvinfo(struct net_device *dev,
 918                             struct ethtool_drvinfo *info)
 919 {
 920         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 921         strcpy(info->version, SOURCE_VERSION);
 922         strcpy(info->fw_version, "N/A");
 923         strcpy(info->bus_info, "batman");
 924 }
 925
 926 static u32 bat_get_msglevel(struct net_device *dev)
 927 {
 928         return -EOPNOTSUPP;
 929 }
 930
 931 static void bat_set_msglevel(struct net_device *dev, u32 value)
 932 {
 933 }
 934
 935 static u32 bat_get_link(struct net_device *dev)
 936 {
 937         return 1;
 938 }
 939
 940 static u32 bat_get_rx_csum(struct net_device *dev)
 941 {
 942         return 0;
 943 }
 944
 945 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 946 {
 947         return -EOPNOTSUPP;
 948 }