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