net/batman-adv/soft-interface.c

   1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "soft-interface.h"
  22 #include "hard-interface.h"
  23 #include "distributed-arp-table.h"
  24 #include "routing.h"
  25 #include "send.h"
  26 #include "debugfs.h"
  27 #include "translation-table.h"
  28 #include "hash.h"
  29 #include "gateway_common.h"
  30 #include "gateway_client.h"
  31 #include "sysfs.h"
  32 #include "originator.h"
  33 #include <linux/slab.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/if_vlan.h>
  37 #include <linux/if_ether.h>
  38 #include "unicast.h"
  39 #include "bridge_loop_avoidance.h"
  40 #include "network-coding.h"
  41
  42
  43 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  44 static void batadv_get_drvinfo(struct net_device *dev,
  45                                struct ethtool_drvinfo *info);
  46 static u32 batadv_get_msglevel(struct net_device *dev);
  47 static void batadv_set_msglevel(struct net_device *dev, u32 value);
  48 static u32 batadv_get_link(struct net_device *dev);
  49 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  50 static void batadv_get_ethtool_stats(struct net_device *dev,
  51                                      struct ethtool_stats *stats, u64 *data);
  52 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  53
  54 static const struct ethtool_ops batadv_ethtool_ops = {
  55         .get_settings = batadv_get_settings,
  56         .get_drvinfo = batadv_get_drvinfo,
  57         .get_msglevel = batadv_get_msglevel,
  58         .set_msglevel = batadv_set_msglevel,
  59         .get_link = batadv_get_link,
  60         .get_strings = batadv_get_strings,
  61         .get_ethtool_stats = batadv_get_ethtool_stats,
  62         .get_sset_count = batadv_get_sset_count,
  63 };
  64
  65 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  66 {
  67         int result;
  68
  69         /* TODO: We must check if we can release all references to non-payload
  70          * data using skb_header_release in our skbs to allow skb_cow_header to
  71          * work optimally. This means that those skbs are not allowed to read
  72          * or write any data which is before the current position of skb->data
  73          * after that call and thus allow other skbs with the same data buffer
  74          * to write freely in that area.
  75          */
  76         result = skb_cow_head(skb, len);
  77         if (result < 0)
  78                 return result;
  79
  80         skb_push(skb, len);
  81         return 0;
  82 }
  83
  84 static int batadv_interface_open(struct net_device *dev)
  85 {
  86         netif_start_queue(dev);
  87         return 0;
  88 }
  89
  90 static int batadv_interface_release(struct net_device *dev)
  91 {
  92         netif_stop_queue(dev);
  93         return 0;
  94 }
  95
  96 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
  97 {
  98         struct batadv_priv *bat_priv = netdev_priv(dev);
  99         struct net_device_stats *stats = &bat_priv->stats;
 100
 101         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 102         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 103         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 104         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 105         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 106         return stats;
 107 }
 108
 109 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 110 {
 111         struct batadv_priv *bat_priv = netdev_priv(dev);
 112         struct sockaddr *addr = p;
 113         uint8_t old_addr[ETH_ALEN];
 114
 115         if (!is_valid_ether_addr(addr->sa_data))
 116                 return -EADDRNOTAVAIL;
 117
 118         memcpy(old_addr, dev->dev_addr, ETH_ALEN);
 119         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 120
 121         /* only modify transtable if it has been initialized before */
 122         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 123                 batadv_tt_local_remove(bat_priv, old_addr,
 124                                        "mac address changed", false);
 125                 batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 132 {
 133         /* check ranges */
 134         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 135                 return -EINVAL;
 136
 137         dev->mtu = new_mtu;
 138
 139         return 0;
 140 }
 141
 142 static int batadv_interface_tx(struct sk_buff *skb,
 143                                struct net_device *soft_iface)
 144 {
 145         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 146         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 147         struct batadv_hard_iface *primary_if = NULL;
 148         struct batadv_bcast_packet *bcast_packet;
 149         struct vlan_ethhdr *vhdr;
 150         __be16 ethertype = __constant_htons(ETH_P_BATMAN);
 151         static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 152                                                    0x00, 0x00};
 153         static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 154                                                     0x00, 0x00};
 155         unsigned int header_len = 0;
 156         int data_len = skb->len, ret;
 157         unsigned short vid __maybe_unused = BATADV_NO_FLAGS;
 158         bool do_bcast = false;
 159         uint32_t seqno;
 160         unsigned long brd_delay = 1;
 161
 162         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 163                 goto dropped;
 164
 165         soft_iface->trans_start = jiffies;
 166
 167         switch (ntohs(ethhdr->h_proto)) {
 168         case ETH_P_8021Q:
 169                 vhdr = (struct vlan_ethhdr *)skb->data;
 170                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 171
 172                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 173                         break;
 174
 175                 /* fall through */
 176         case ETH_P_BATMAN:
 177                 goto dropped;
 178         }
 179
 180         if (batadv_bla_tx(bat_priv, skb, vid))
 181                 goto dropped;
 182
 183         /* skb->data might have been reallocated by batadv_bla_tx() */
 184         ethhdr = (struct ethhdr *)skb->data;
 185
 186         /* Register the client MAC in the transtable */
 187         if (!is_multicast_ether_addr(ethhdr->h_source))
 188                 batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 189
 190         /* don't accept stp packets. STP does not help in meshes.
 191          * better use the bridge loop avoidance ...
 192          *
 193          * The same goes for ECTP sent at least by some Cisco Switches,
 194          * it might confuse the mesh when used with bridge loop avoidance.
 195          */
 196         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 197                 goto dropped;
 198
 199         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 200                 goto dropped;
 201
 202         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 203                 do_bcast = true;
 204
 205                 switch (atomic_read(&bat_priv->gw_mode)) {
 206                 case BATADV_GW_MODE_SERVER:
 207                         /* gateway servers should not send dhcp
 208                          * requests into the mesh
 209                          */
 210                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 211                         if (ret)
 212                                 goto dropped;
 213                         break;
 214                 case BATADV_GW_MODE_CLIENT:
 215                         /* gateway clients should send dhcp requests
 216                          * via unicast to their gateway
 217                          */
 218                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 219                         if (ret)
 220                                 do_bcast = false;
 221                         break;
 222                 case BATADV_GW_MODE_OFF:
 223                 default:
 224                         break;
 225                 }
 226
 227                 /* reminder: ethhdr might have become unusable from here on
 228                  * (batadv_gw_is_dhcp_target() might have reallocated skb data)
 229                  */
 230         }
 231
 232         /* ethernet packet should be broadcasted */
 233         if (do_bcast) {
 234                 primary_if = batadv_primary_if_get_selected(bat_priv);
 235                 if (!primary_if)
 236                         goto dropped;
 237
 238                 /* in case of ARP request, we do not immediately broadcasti the
 239                  * packet, instead we first wait for DAT to try to retrieve the
 240                  * correct ARP entry
 241                  */
 242                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 243                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 244
 245                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 246                         goto dropped;
 247
 248                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 249                 bcast_packet->header.version = BATADV_COMPAT_VERSION;
 250                 bcast_packet->header.ttl = BATADV_TTL;
 251
 252                 /* batman packet type: broadcast */
 253                 bcast_packet->header.packet_type = BATADV_BCAST;
 254                 bcast_packet->reserved = 0;
 255
 256                 /* hw address of first interface is the orig mac because only
 257                  * this mac is known throughout the mesh
 258                  */
 259                 memcpy(bcast_packet->orig,
 260                        primary_if->net_dev->dev_addr, ETH_ALEN);
 261
 262                 /* set broadcast sequence number */
 263                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 264                 bcast_packet->seqno = htonl(seqno);
 265
 266                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 267
 268                 /* a copy is stored in the bcast list, therefore removing
 269                  * the original skb.
 270                  */
 271                 kfree_skb(skb);
 272
 273         /* unicast packet */
 274         } else {
 275                 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 276                         ret = batadv_gw_out_of_range(bat_priv, skb);
 277                         if (ret)
 278                                 goto dropped;
 279                 }
 280
 281                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 282                         goto dropped;
 283
 284                 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 285
 286                 ret = batadv_unicast_send_skb(bat_priv, skb);
 287                 if (ret != 0)
 288                         goto dropped_freed;
 289         }
 290
 291         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 292         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 293         goto end;
 294
 295 dropped:
 296         kfree_skb(skb);
 297 dropped_freed:
 298         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 299 end:
 300         if (primary_if)
 301                 batadv_hardif_free_ref(primary_if);
 302         return NETDEV_TX_OK;
 303 }
 304
 305 void batadv_interface_rx(struct net_device *soft_iface,
 306                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 307                          int hdr_size, struct batadv_orig_node *orig_node)
 308 {
 309         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 310         struct ethhdr *ethhdr;
 311         struct vlan_ethhdr *vhdr;
 312         struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 313         unsigned short vid __maybe_unused = BATADV_NO_FLAGS;
 314         __be16 ethertype = __constant_htons(ETH_P_BATMAN);
 315         bool is_bcast;
 316
 317         is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 318
 319         /* check if enough space is available for pulling, and pull */
 320         if (!pskb_may_pull(skb, hdr_size))
 321                 goto dropped;
 322
 323         skb_pull_rcsum(skb, hdr_size);
 324         skb_reset_mac_header(skb);
 325
 326         ethhdr = eth_hdr(skb);
 327
 328         switch (ntohs(ethhdr->h_proto)) {
 329         case ETH_P_8021Q:
 330                 vhdr = (struct vlan_ethhdr *)skb->data;
 331                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 332
 333                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 334                         break;
 335
 336                 /* fall through */
 337         case ETH_P_BATMAN:
 338                 goto dropped;
 339         }
 340
 341         /* skb->dev & skb->pkt_type are set here */
 342         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 343                 goto dropped;
 344         skb->protocol = eth_type_trans(skb, soft_iface);
 345
 346         /* should not be necessary anymore as we use skb_pull_rcsum()
 347          * TODO: please verify this and remove this TODO
 348          * -- Dec 21st 2009, Simon Wunderlich
 349          */
 350
 351         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 352
 353         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 354         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 355                            skb->len + ETH_HLEN);
 356
 357         soft_iface->last_rx = jiffies;
 358
 359         /* Let the bridge loop avoidance check the packet. If will
 360          * not handle it, we can safely push it up.
 361          */
 362         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 363                 goto out;
 364
 365         if (orig_node)
 366                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 367                                                      ethhdr->h_source);
 368
 369         if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 370                 goto dropped;
 371
 372         netif_rx(skb);
 373         goto out;
 374
 375 dropped:
 376         kfree_skb(skb);
 377 out:
 378         return;
 379 }
 380
 381 /* batman-adv network devices have devices nesting below it and are a special
 382  * "super class" of normal network devices; split their locks off into a
 383  * separate class since they always nest.
 384  */
 385 static struct lock_class_key batadv_netdev_xmit_lock_key;
 386 static struct lock_class_key batadv_netdev_addr_lock_key;
 387
 388 /**
 389  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 390  * @dev: device which owns the tx queue
 391  * @txq: tx queue to modify
 392  * @_unused: always NULL
 393  */
 394 static void batadv_set_lockdep_class_one(struct net_device *dev,
 395                                          struct netdev_queue *txq,
 396                                          void *_unused)
 397 {
 398         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 399 }
 400
 401 /**
 402  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 403  * @dev: network device to modify
 404  */
 405 static void batadv_set_lockdep_class(struct net_device *dev)
 406 {
 407         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 408         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 409 }
 410
 411 /**
 412  * batadv_softif_destroy_finish - cleans up the remains of a softif
 413  * @work: work queue item
 414  *
 415  * Free the parts of the soft interface which can not be removed under
 416  * rtnl lock (to prevent deadlock situations).
 417  */
 418 static void batadv_softif_destroy_finish(struct work_struct *work)
 419 {
 420         struct batadv_priv *bat_priv;
 421         struct net_device *soft_iface;
 422
 423         bat_priv = container_of(work, struct batadv_priv,
 424                                 cleanup_work);
 425         soft_iface = bat_priv->soft_iface;
 426
 427         batadv_sysfs_del_meshif(soft_iface);
 428
 429         rtnl_lock();
 430         unregister_netdevice(soft_iface);
 431         rtnl_unlock();
 432 }
 433
 434 /**
 435  * batadv_softif_init_late - late stage initialization of soft interface
 436  * @dev: registered network device to modify
 437  *
 438  * Returns error code on failures
 439  */
 440 static int batadv_softif_init_late(struct net_device *dev)
 441 {
 442         struct batadv_priv *bat_priv;
 443         int ret;
 444         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 445
 446         batadv_set_lockdep_class(dev);
 447
 448         bat_priv = netdev_priv(dev);
 449         bat_priv->soft_iface = dev;
 450         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 451
 452         /* batadv_interface_stats() needs to be available as soon as
 453          * register_netdevice() has been called
 454          */
 455         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 456         if (!bat_priv->bat_counters)
 457                 return -ENOMEM;
 458
 459         atomic_set(&bat_priv->aggregated_ogms, 1);
 460         atomic_set(&bat_priv->bonding, 0);
 461 #ifdef CONFIG_BATMAN_ADV_BLA
 462         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 463 #endif
 464 #ifdef CONFIG_BATMAN_ADV_DAT
 465         atomic_set(&bat_priv->distributed_arp_table, 1);
 466 #endif
 467         atomic_set(&bat_priv->ap_isolation, 0);
 468         atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
 469         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 470         atomic_set(&bat_priv->gw_sel_class, 20);
 471         atomic_set(&bat_priv->gw_bandwidth, 41);
 472         atomic_set(&bat_priv->orig_interval, 1000);
 473         atomic_set(&bat_priv->hop_penalty, 30);
 474 #ifdef CONFIG_BATMAN_ADV_DEBUG
 475         atomic_set(&bat_priv->log_level, 0);
 476 #endif
 477         atomic_set(&bat_priv->fragmentation, 1);
 478         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 479         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 480
 481         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 482         atomic_set(&bat_priv->bcast_seqno, 1);
 483         atomic_set(&bat_priv->tt.vn, 0);
 484         atomic_set(&bat_priv->tt.local_changes, 0);
 485         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 486 #ifdef CONFIG_BATMAN_ADV_BLA
 487         atomic_set(&bat_priv->bla.num_requests, 0);
 488 #endif
 489         bat_priv->tt.last_changeset = NULL;
 490         bat_priv->tt.last_changeset_len = 0;
 491
 492         bat_priv->primary_if = NULL;
 493         bat_priv->num_ifaces = 0;
 494
 495         batadv_nc_init_bat_priv(bat_priv);
 496
 497         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 498         if (ret < 0)
 499                 goto free_bat_counters;
 500
 501         ret = batadv_debugfs_add_meshif(dev);
 502         if (ret < 0)
 503                 goto free_bat_counters;
 504
 505         ret = batadv_mesh_init(dev);
 506         if (ret < 0)
 507                 goto unreg_debugfs;
 508
 509         return 0;
 510
 511 unreg_debugfs:
 512         batadv_debugfs_del_meshif(dev);
 513 free_bat_counters:
 514         free_percpu(bat_priv->bat_counters);
 515         bat_priv->bat_counters = NULL;
 516
 517         return ret;
 518 }
 519
 520 /**
 521  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
 522  * @dev: batadv_soft_interface used as master interface
 523  * @slave_dev: net_device which should become the slave interface
 524  *
 525  * Return 0 if successful or error otherwise.
 526  */
 527 static int batadv_softif_slave_add(struct net_device *dev,
 528                                    struct net_device *slave_dev)
 529 {
 530         struct batadv_hard_iface *hard_iface;
 531         int ret = -EINVAL;
 532
 533         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 534         if (!hard_iface || hard_iface->soft_iface != NULL)
 535                 goto out;
 536
 537         ret = batadv_hardif_enable_interface(hard_iface, dev->name);
 538
 539 out:
 540         if (hard_iface)
 541                 batadv_hardif_free_ref(hard_iface);
 542         return ret;
 543 }
 544
 545 /**
 546  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
 547  * @dev: batadv_soft_interface used as master interface
 548  * @slave_dev: net_device which should be removed from the master interface
 549  *
 550  * Return 0 if successful or error otherwise.
 551  */
 552 static int batadv_softif_slave_del(struct net_device *dev,
 553                                    struct net_device *slave_dev)
 554 {
 555         struct batadv_hard_iface *hard_iface;
 556         int ret = -EINVAL;
 557
 558         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 559
 560         if (!hard_iface || hard_iface->soft_iface != dev)
 561                 goto out;
 562
 563         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 564         ret = 0;
 565
 566 out:
 567         if (hard_iface)
 568                 batadv_hardif_free_ref(hard_iface);
 569         return ret;
 570 }
 571
 572 static const struct net_device_ops batadv_netdev_ops = {
 573         .ndo_init = batadv_softif_init_late,
 574         .ndo_open = batadv_interface_open,
 575         .ndo_stop = batadv_interface_release,
 576         .ndo_get_stats = batadv_interface_stats,
 577         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 578         .ndo_change_mtu = batadv_interface_change_mtu,
 579         .ndo_start_xmit = batadv_interface_tx,
 580         .ndo_validate_addr = eth_validate_addr,
 581         .ndo_add_slave = batadv_softif_slave_add,
 582         .ndo_del_slave = batadv_softif_slave_del,
 583 };
 584
 585 /**
 586  * batadv_softif_free - Deconstructor of batadv_soft_interface
 587  * @dev: Device to cleanup and remove
 588  */
 589 static void batadv_softif_free(struct net_device *dev)
 590 {
 591         batadv_debugfs_del_meshif(dev);
 592         batadv_mesh_free(dev);
 593
 594         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
 595          * their tasks. Wait for them all to be finished before freeing the
 596          * netdev and its private data (bat_priv)
 597          */
 598         rcu_barrier();
 599
 600         free_netdev(dev);
 601 }
 602
 603 /**
 604  * batadv_softif_init_early - early stage initialization of soft interface
 605  * @dev: registered network device to modify
 606  */
 607 static void batadv_softif_init_early(struct net_device *dev)
 608 {
 609         struct batadv_priv *priv = netdev_priv(dev);
 610
 611         ether_setup(dev);
 612
 613         dev->netdev_ops = &batadv_netdev_ops;
 614         dev->destructor = batadv_softif_free;
 615         dev->tx_queue_len = 0;
 616
 617         /* can't call min_mtu, because the needed variables
 618          * have not been initialized yet
 619          */
 620         dev->mtu = ETH_DATA_LEN;
 621         /* reserve more space in the skbuff for our header */
 622         dev->hard_header_len = BATADV_HEADER_LEN;
 623
 624         /* generate random address */
 625         eth_hw_addr_random(dev);
 626
 627         SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 628
 629         memset(priv, 0, sizeof(*priv));
 630 }
 631
 632 struct net_device *batadv_softif_create(const char *name)
 633 {
 634         struct net_device *soft_iface;
 635         int ret;
 636
 637         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
 638                                   batadv_softif_init_early);
 639         if (!soft_iface)
 640                 return NULL;
 641
 642         soft_iface->rtnl_link_ops = &batadv_link_ops;
 643
 644         ret = register_netdevice(soft_iface);
 645         if (ret < 0) {
 646                 pr_err("Unable to register the batman interface '%s': %i\n",
 647                        name, ret);
 648                 free_netdev(soft_iface);
 649                 return NULL;
 650         }
 651
 652         return soft_iface;
 653 }
 654
 655 /**
 656  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
 657  * @soft_iface: the to-be-removed batman-adv interface
 658  */
 659 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 660 {
 661         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 662
 663         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 664 }
 665
 666 /**
 667  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
 668  * @soft_iface: the to-be-removed batman-adv interface
 669  * @head: list pointer
 670  */
 671 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 672                                           struct list_head *head)
 673 {
 674         struct batadv_hard_iface *hard_iface;
 675
 676         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 677                 if (hard_iface->soft_iface == soft_iface)
 678                         batadv_hardif_disable_interface(hard_iface,
 679                                                         BATADV_IF_CLEANUP_KEEP);
 680         }
 681
 682         batadv_sysfs_del_meshif(soft_iface);
 683         unregister_netdevice_queue(soft_iface, head);
 684 }
 685
 686 int batadv_softif_is_valid(const struct net_device *net_dev)
 687 {
 688         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 689                 return 1;
 690
 691         return 0;
 692 }
 693
 694 struct rtnl_link_ops batadv_link_ops __read_mostly = {
 695         .kind           = "batadv",
 696         .priv_size      = sizeof(struct batadv_priv),
 697         .setup          = batadv_softif_init_early,
 698         .dellink        = batadv_softif_destroy_netlink,
 699 };
 700
 701 /* ethtool */
 702 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 703 {
 704         cmd->supported = 0;
 705         cmd->advertising = 0;
 706         ethtool_cmd_speed_set(cmd, SPEED_10);
 707         cmd->duplex = DUPLEX_FULL;
 708         cmd->port = PORT_TP;
 709         cmd->phy_address = 0;
 710         cmd->transceiver = XCVR_INTERNAL;
 711         cmd->autoneg = AUTONEG_DISABLE;
 712         cmd->maxtxpkt = 0;
 713         cmd->maxrxpkt = 0;
 714
 715         return 0;
 716 }
 717
 718 static void batadv_get_drvinfo(struct net_device *dev,
 719                                struct ethtool_drvinfo *info)
 720 {
 721         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 722         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 723         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 724         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
 725 }
 726
 727 static u32 batadv_get_msglevel(struct net_device *dev)
 728 {
 729         return -EOPNOTSUPP;
 730 }
 731
 732 static void batadv_set_msglevel(struct net_device *dev, u32 value)
 733 {
 734 }
 735
 736 static u32 batadv_get_link(struct net_device *dev)
 737 {
 738         return 1;
 739 }
 740
 741 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 742  * Declare each description string in struct.name[] to get fixed sized buffer
 743  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 744  */
 745 static const struct {
 746         const char name[ETH_GSTRING_LEN];
 747 } batadv_counters_strings[] = {
 748         { "tx" },
 749         { "tx_bytes" },
 750         { "tx_dropped" },
 751         { "rx" },
 752         { "rx_bytes" },
 753         { "forward" },
 754         { "forward_bytes" },
 755         { "mgmt_tx" },
 756         { "mgmt_tx_bytes" },
 757         { "mgmt_rx" },
 758         { "mgmt_rx_bytes" },
 759         { "tt_request_tx" },
 760         { "tt_request_rx" },
 761         { "tt_response_tx" },
 762         { "tt_response_rx" },
 763         { "tt_roam_adv_tx" },
 764         { "tt_roam_adv_rx" },
 765 #ifdef CONFIG_BATMAN_ADV_DAT
 766         { "dat_get_tx" },
 767         { "dat_get_rx" },
 768         { "dat_put_tx" },
 769         { "dat_put_rx" },
 770         { "dat_cached_reply_tx" },
 771 #endif
 772 #ifdef CONFIG_BATMAN_ADV_NC
 773         { "nc_code" },
 774         { "nc_code_bytes" },
 775         { "nc_recode" },
 776         { "nc_recode_bytes" },
 777         { "nc_buffer" },
 778         { "nc_decode" },
 779         { "nc_decode_bytes" },
 780         { "nc_decode_failed" },
 781         { "nc_sniffed" },
 782 #endif
 783 };
 784
 785 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 786                                uint8_t *data)
 787 {
 788         if (stringset == ETH_SS_STATS)
 789                 memcpy(data, batadv_counters_strings,
 790                        sizeof(batadv_counters_strings));
 791 }
 792
 793 static void batadv_get_ethtool_stats(struct net_device *dev,
 794                                      struct ethtool_stats *stats,
 795                                      uint64_t *data)
 796 {
 797         struct batadv_priv *bat_priv = netdev_priv(dev);
 798         int i;
 799
 800         for (i = 0; i < BATADV_CNT_NUM; i++)
 801                 data[i] = batadv_sum_counter(bat_priv, i);
 802 }
 803
 804 static int batadv_get_sset_count(struct net_device *dev, int stringset)
 805 {
 806         if (stringset == ETH_SS_STATS)
 807                 return BATADV_CNT_NUM;
 808
 809         return -EOPNOTSUPP;
 810 }