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                 vid |= BATADV_VLAN_HAS_TAG;
 172
 173                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 174                         break;
 175
 176                 /* fall through */
 177         case ETH_P_BATMAN:
 178                 goto dropped;
 179         }
 180
 181         if (batadv_bla_tx(bat_priv, skb, vid))
 182                 goto dropped;
 183
 184         /* skb->data might have been reallocated by batadv_bla_tx() */
 185         ethhdr = (struct ethhdr *)skb->data;
 186
 187         /* Register the client MAC in the transtable */
 188         if (!is_multicast_ether_addr(ethhdr->h_source))
 189                 batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 190
 191         /* don't accept stp packets. STP does not help in meshes.
 192          * better use the bridge loop avoidance ...
 193          *
 194          * The same goes for ECTP sent at least by some Cisco Switches,
 195          * it might confuse the mesh when used with bridge loop avoidance.
 196          */
 197         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 198                 goto dropped;
 199
 200         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 201                 goto dropped;
 202
 203         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 204                 do_bcast = true;
 205
 206                 switch (atomic_read(&bat_priv->gw_mode)) {
 207                 case BATADV_GW_MODE_SERVER:
 208                         /* gateway servers should not send dhcp
 209                          * requests into the mesh
 210                          */
 211                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 212                         if (ret)
 213                                 goto dropped;
 214                         break;
 215                 case BATADV_GW_MODE_CLIENT:
 216                         /* gateway clients should send dhcp requests
 217                          * via unicast to their gateway
 218                          */
 219                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 220                         if (ret)
 221                                 do_bcast = false;
 222                         break;
 223                 case BATADV_GW_MODE_OFF:
 224                 default:
 225                         break;
 226                 }
 227
 228                 /* reminder: ethhdr might have become unusable from here on
 229                  * (batadv_gw_is_dhcp_target() might have reallocated skb data)
 230                  */
 231         }
 232
 233         batadv_skb_set_priority(skb, 0);
 234
 235         /* ethernet packet should be broadcasted */
 236         if (do_bcast) {
 237                 primary_if = batadv_primary_if_get_selected(bat_priv);
 238                 if (!primary_if)
 239                         goto dropped;
 240
 241                 /* in case of ARP request, we do not immediately broadcasti the
 242                  * packet, instead we first wait for DAT to try to retrieve the
 243                  * correct ARP entry
 244                  */
 245                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 246                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 247
 248                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 249                         goto dropped;
 250
 251                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 252                 bcast_packet->header.version = BATADV_COMPAT_VERSION;
 253                 bcast_packet->header.ttl = BATADV_TTL;
 254
 255                 /* batman packet type: broadcast */
 256                 bcast_packet->header.packet_type = BATADV_BCAST;
 257                 bcast_packet->reserved = 0;
 258
 259                 /* hw address of first interface is the orig mac because only
 260                  * this mac is known throughout the mesh
 261                  */
 262                 memcpy(bcast_packet->orig,
 263                        primary_if->net_dev->dev_addr, ETH_ALEN);
 264
 265                 /* set broadcast sequence number */
 266                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 267                 bcast_packet->seqno = htonl(seqno);
 268
 269                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 270
 271                 /* a copy is stored in the bcast list, therefore removing
 272                  * the original skb.
 273                  */
 274                 kfree_skb(skb);
 275
 276         /* unicast packet */
 277         } else {
 278                 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 279                         ret = batadv_gw_out_of_range(bat_priv, skb);
 280                         if (ret)
 281                                 goto dropped;
 282                 }
 283
 284                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 285                         goto dropped;
 286
 287                 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 288
 289                 ret = batadv_unicast_send_skb(bat_priv, skb);
 290                 if (ret != 0)
 291                         goto dropped_freed;
 292         }
 293
 294         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 295         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 296         goto end;
 297
 298 dropped:
 299         kfree_skb(skb);
 300 dropped_freed:
 301         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 302 end:
 303         if (primary_if)
 304                 batadv_hardif_free_ref(primary_if);
 305         return NETDEV_TX_OK;
 306 }
 307
 308 void batadv_interface_rx(struct net_device *soft_iface,
 309                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 310                          int hdr_size, struct batadv_orig_node *orig_node)
 311 {
 312         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 313         struct ethhdr *ethhdr;
 314         struct vlan_ethhdr *vhdr;
 315         struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 316         unsigned short vid __maybe_unused = BATADV_NO_FLAGS;
 317         __be16 ethertype = __constant_htons(ETH_P_BATMAN);
 318         bool is_bcast;
 319
 320         is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 321
 322         /* check if enough space is available for pulling, and pull */
 323         if (!pskb_may_pull(skb, hdr_size))
 324                 goto dropped;
 325
 326         skb_pull_rcsum(skb, hdr_size);
 327         skb_reset_mac_header(skb);
 328
 329         ethhdr = eth_hdr(skb);
 330
 331         switch (ntohs(ethhdr->h_proto)) {
 332         case ETH_P_8021Q:
 333                 vhdr = (struct vlan_ethhdr *)skb->data;
 334                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 335                 vid |= BATADV_VLAN_HAS_TAG;
 336
 337                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 338                         break;
 339
 340                 /* fall through */
 341         case ETH_P_BATMAN:
 342                 goto dropped;
 343         }
 344
 345         /* skb->dev & skb->pkt_type are set here */
 346         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 347                 goto dropped;
 348         skb->protocol = eth_type_trans(skb, soft_iface);
 349
 350         /* should not be necessary anymore as we use skb_pull_rcsum()
 351          * TODO: please verify this and remove this TODO
 352          * -- Dec 21st 2009, Simon Wunderlich
 353          */
 354
 355         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 356
 357         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 358         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 359                            skb->len + ETH_HLEN);
 360
 361         soft_iface->last_rx = jiffies;
 362
 363         /* Let the bridge loop avoidance check the packet. If will
 364          * not handle it, we can safely push it up.
 365          */
 366         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 367                 goto out;
 368
 369         if (orig_node)
 370                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 371                                                      ethhdr->h_source);
 372
 373         if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 374                 goto dropped;
 375
 376         netif_rx(skb);
 377         goto out;
 378
 379 dropped:
 380         kfree_skb(skb);
 381 out:
 382         return;
 383 }
 384
 385 /* batman-adv network devices have devices nesting below it and are a special
 386  * "super class" of normal network devices; split their locks off into a
 387  * separate class since they always nest.
 388  */
 389 static struct lock_class_key batadv_netdev_xmit_lock_key;
 390 static struct lock_class_key batadv_netdev_addr_lock_key;
 391
 392 /**
 393  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 394  * @dev: device which owns the tx queue
 395  * @txq: tx queue to modify
 396  * @_unused: always NULL
 397  */
 398 static void batadv_set_lockdep_class_one(struct net_device *dev,
 399                                          struct netdev_queue *txq,
 400                                          void *_unused)
 401 {
 402         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 403 }
 404
 405 /**
 406  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 407  * @dev: network device to modify
 408  */
 409 static void batadv_set_lockdep_class(struct net_device *dev)
 410 {
 411         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 412         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 413 }
 414
 415 /**
 416  * batadv_softif_destroy_finish - cleans up the remains of a softif
 417  * @work: work queue item
 418  *
 419  * Free the parts of the soft interface which can not be removed under
 420  * rtnl lock (to prevent deadlock situations).
 421  */
 422 static void batadv_softif_destroy_finish(struct work_struct *work)
 423 {
 424         struct batadv_priv *bat_priv;
 425         struct net_device *soft_iface;
 426
 427         bat_priv = container_of(work, struct batadv_priv,
 428                                 cleanup_work);
 429         soft_iface = bat_priv->soft_iface;
 430
 431         batadv_sysfs_del_meshif(soft_iface);
 432
 433         rtnl_lock();
 434         unregister_netdevice(soft_iface);
 435         rtnl_unlock();
 436 }
 437
 438 /**
 439  * batadv_softif_init_late - late stage initialization of soft interface
 440  * @dev: registered network device to modify
 441  *
 442  * Returns error code on failures
 443  */
 444 static int batadv_softif_init_late(struct net_device *dev)
 445 {
 446         struct batadv_priv *bat_priv;
 447         int ret;
 448         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 449
 450         batadv_set_lockdep_class(dev);
 451
 452         bat_priv = netdev_priv(dev);
 453         bat_priv->soft_iface = dev;
 454         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 455
 456         /* batadv_interface_stats() needs to be available as soon as
 457          * register_netdevice() has been called
 458          */
 459         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 460         if (!bat_priv->bat_counters)
 461                 return -ENOMEM;
 462
 463         atomic_set(&bat_priv->aggregated_ogms, 1);
 464         atomic_set(&bat_priv->bonding, 0);
 465 #ifdef CONFIG_BATMAN_ADV_BLA
 466         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 467 #endif
 468 #ifdef CONFIG_BATMAN_ADV_DAT
 469         atomic_set(&bat_priv->distributed_arp_table, 1);
 470 #endif
 471         atomic_set(&bat_priv->ap_isolation, 0);
 472         atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
 473         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 474         atomic_set(&bat_priv->gw_sel_class, 20);
 475         atomic_set(&bat_priv->gw_bandwidth, 41);
 476         atomic_set(&bat_priv->orig_interval, 1000);
 477         atomic_set(&bat_priv->hop_penalty, 30);
 478 #ifdef CONFIG_BATMAN_ADV_DEBUG
 479         atomic_set(&bat_priv->log_level, 0);
 480 #endif
 481         atomic_set(&bat_priv->fragmentation, 1);
 482         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 483         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 484
 485         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 486         atomic_set(&bat_priv->bcast_seqno, 1);
 487         atomic_set(&bat_priv->tt.vn, 0);
 488         atomic_set(&bat_priv->tt.local_changes, 0);
 489         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 490 #ifdef CONFIG_BATMAN_ADV_BLA
 491         atomic_set(&bat_priv->bla.num_requests, 0);
 492 #endif
 493         bat_priv->tt.last_changeset = NULL;
 494         bat_priv->tt.last_changeset_len = 0;
 495
 496         bat_priv->primary_if = NULL;
 497         bat_priv->num_ifaces = 0;
 498
 499         batadv_nc_init_bat_priv(bat_priv);
 500
 501         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 502         if (ret < 0)
 503                 goto free_bat_counters;
 504
 505         ret = batadv_debugfs_add_meshif(dev);
 506         if (ret < 0)
 507                 goto free_bat_counters;
 508
 509         ret = batadv_mesh_init(dev);
 510         if (ret < 0)
 511                 goto unreg_debugfs;
 512
 513         return 0;
 514
 515 unreg_debugfs:
 516         batadv_debugfs_del_meshif(dev);
 517 free_bat_counters:
 518         free_percpu(bat_priv->bat_counters);
 519         bat_priv->bat_counters = NULL;
 520
 521         return ret;
 522 }
 523
 524 /**
 525  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
 526  * @dev: batadv_soft_interface used as master interface
 527  * @slave_dev: net_device which should become the slave interface
 528  *
 529  * Return 0 if successful or error otherwise.
 530  */
 531 static int batadv_softif_slave_add(struct net_device *dev,
 532                                    struct net_device *slave_dev)
 533 {
 534         struct batadv_hard_iface *hard_iface;
 535         int ret = -EINVAL;
 536
 537         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 538         if (!hard_iface || hard_iface->soft_iface != NULL)
 539                 goto out;
 540
 541         ret = batadv_hardif_enable_interface(hard_iface, dev->name);
 542
 543 out:
 544         if (hard_iface)
 545                 batadv_hardif_free_ref(hard_iface);
 546         return ret;
 547 }
 548
 549 /**
 550  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
 551  * @dev: batadv_soft_interface used as master interface
 552  * @slave_dev: net_device which should be removed from the master interface
 553  *
 554  * Return 0 if successful or error otherwise.
 555  */
 556 static int batadv_softif_slave_del(struct net_device *dev,
 557                                    struct net_device *slave_dev)
 558 {
 559         struct batadv_hard_iface *hard_iface;
 560         int ret = -EINVAL;
 561
 562         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 563
 564         if (!hard_iface || hard_iface->soft_iface != dev)
 565                 goto out;
 566
 567         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 568         ret = 0;
 569
 570 out:
 571         if (hard_iface)
 572                 batadv_hardif_free_ref(hard_iface);
 573         return ret;
 574 }
 575
 576 static const struct net_device_ops batadv_netdev_ops = {
 577         .ndo_init = batadv_softif_init_late,
 578         .ndo_open = batadv_interface_open,
 579         .ndo_stop = batadv_interface_release,
 580         .ndo_get_stats = batadv_interface_stats,
 581         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 582         .ndo_change_mtu = batadv_interface_change_mtu,
 583         .ndo_start_xmit = batadv_interface_tx,
 584         .ndo_validate_addr = eth_validate_addr,
 585         .ndo_add_slave = batadv_softif_slave_add,
 586         .ndo_del_slave = batadv_softif_slave_del,
 587 };
 588
 589 /**
 590  * batadv_softif_free - Deconstructor of batadv_soft_interface
 591  * @dev: Device to cleanup and remove
 592  */
 593 static void batadv_softif_free(struct net_device *dev)
 594 {
 595         batadv_debugfs_del_meshif(dev);
 596         batadv_mesh_free(dev);
 597
 598         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
 599          * their tasks. Wait for them all to be finished before freeing the
 600          * netdev and its private data (bat_priv)
 601          */
 602         rcu_barrier();
 603
 604         free_netdev(dev);
 605 }
 606
 607 /**
 608  * batadv_softif_init_early - early stage initialization of soft interface
 609  * @dev: registered network device to modify
 610  */
 611 static void batadv_softif_init_early(struct net_device *dev)
 612 {
 613         struct batadv_priv *priv = netdev_priv(dev);
 614
 615         ether_setup(dev);
 616
 617         dev->netdev_ops = &batadv_netdev_ops;
 618         dev->destructor = batadv_softif_free;
 619         dev->tx_queue_len = 0;
 620
 621         /* can't call min_mtu, because the needed variables
 622          * have not been initialized yet
 623          */
 624         dev->mtu = ETH_DATA_LEN;
 625         /* reserve more space in the skbuff for our header */
 626         dev->hard_header_len = BATADV_HEADER_LEN;
 627
 628         /* generate random address */
 629         eth_hw_addr_random(dev);
 630
 631         SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 632
 633         memset(priv, 0, sizeof(*priv));
 634 }
 635
 636 struct net_device *batadv_softif_create(const char *name)
 637 {
 638         struct net_device *soft_iface;
 639         int ret;
 640
 641         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
 642                                   batadv_softif_init_early);
 643         if (!soft_iface)
 644                 return NULL;
 645
 646         soft_iface->rtnl_link_ops = &batadv_link_ops;
 647
 648         ret = register_netdevice(soft_iface);
 649         if (ret < 0) {
 650                 pr_err("Unable to register the batman interface '%s': %i\n",
 651                        name, ret);
 652                 free_netdev(soft_iface);
 653                 return NULL;
 654         }
 655
 656         return soft_iface;
 657 }
 658
 659 /**
 660  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
 661  * @soft_iface: the to-be-removed batman-adv interface
 662  */
 663 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 664 {
 665         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 666
 667         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 668 }
 669
 670 /**
 671  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
 672  * @soft_iface: the to-be-removed batman-adv interface
 673  * @head: list pointer
 674  */
 675 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 676                                           struct list_head *head)
 677 {
 678         struct batadv_hard_iface *hard_iface;
 679
 680         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 681                 if (hard_iface->soft_iface == soft_iface)
 682                         batadv_hardif_disable_interface(hard_iface,
 683                                                         BATADV_IF_CLEANUP_KEEP);
 684         }
 685
 686         batadv_sysfs_del_meshif(soft_iface);
 687         unregister_netdevice_queue(soft_iface, head);
 688 }
 689
 690 int batadv_softif_is_valid(const struct net_device *net_dev)
 691 {
 692         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 693                 return 1;
 694
 695         return 0;
 696 }
 697
 698 struct rtnl_link_ops batadv_link_ops __read_mostly = {
 699         .kind           = "batadv",
 700         .priv_size      = sizeof(struct batadv_priv),
 701         .setup          = batadv_softif_init_early,
 702         .dellink        = batadv_softif_destroy_netlink,
 703 };
 704
 705 /* ethtool */
 706 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 707 {
 708         cmd->supported = 0;
 709         cmd->advertising = 0;
 710         ethtool_cmd_speed_set(cmd, SPEED_10);
 711         cmd->duplex = DUPLEX_FULL;
 712         cmd->port = PORT_TP;
 713         cmd->phy_address = 0;
 714         cmd->transceiver = XCVR_INTERNAL;
 715         cmd->autoneg = AUTONEG_DISABLE;
 716         cmd->maxtxpkt = 0;
 717         cmd->maxrxpkt = 0;
 718
 719         return 0;
 720 }
 721
 722 static void batadv_get_drvinfo(struct net_device *dev,
 723                                struct ethtool_drvinfo *info)
 724 {
 725         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 726         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 727         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 728         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
 729 }
 730
 731 static u32 batadv_get_msglevel(struct net_device *dev)
 732 {
 733         return -EOPNOTSUPP;
 734 }
 735
 736 static void batadv_set_msglevel(struct net_device *dev, u32 value)
 737 {
 738 }
 739
 740 static u32 batadv_get_link(struct net_device *dev)
 741 {
 742         return 1;
 743 }
 744
 745 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 746  * Declare each description string in struct.name[] to get fixed sized buffer
 747  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 748  */
 749 static const struct {
 750         const char name[ETH_GSTRING_LEN];
 751 } batadv_counters_strings[] = {
 752         { "tx" },
 753         { "tx_bytes" },
 754         { "tx_dropped" },
 755         { "rx" },
 756         { "rx_bytes" },
 757         { "forward" },
 758         { "forward_bytes" },
 759         { "mgmt_tx" },
 760         { "mgmt_tx_bytes" },
 761         { "mgmt_rx" },
 762         { "mgmt_rx_bytes" },
 763         { "tt_request_tx" },
 764         { "tt_request_rx" },
 765         { "tt_response_tx" },
 766         { "tt_response_rx" },
 767         { "tt_roam_adv_tx" },
 768         { "tt_roam_adv_rx" },
 769 #ifdef CONFIG_BATMAN_ADV_DAT
 770         { "dat_get_tx" },
 771         { "dat_get_rx" },
 772         { "dat_put_tx" },
 773         { "dat_put_rx" },
 774         { "dat_cached_reply_tx" },
 775 #endif
 776 #ifdef CONFIG_BATMAN_ADV_NC
 777         { "nc_code" },
 778         { "nc_code_bytes" },
 779         { "nc_recode" },
 780         { "nc_recode_bytes" },
 781         { "nc_buffer" },
 782         { "nc_decode" },
 783         { "nc_decode_bytes" },
 784         { "nc_decode_failed" },
 785         { "nc_sniffed" },
 786 #endif
 787 };
 788
 789 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 790                                uint8_t *data)
 791 {
 792         if (stringset == ETH_SS_STATS)
 793                 memcpy(data, batadv_counters_strings,
 794                        sizeof(batadv_counters_strings));
 795 }
 796
 797 static void batadv_get_ethtool_stats(struct net_device *dev,
 798                                      struct ethtool_stats *stats,
 799                                      uint64_t *data)
 800 {
 801         struct batadv_priv *bat_priv = netdev_priv(dev);
 802         int i;
 803
 804         for (i = 0; i < BATADV_CNT_NUM; i++)
 805                 data[i] = batadv_sum_counter(bat_priv, i);
 806 }
 807
 808 static int batadv_get_sset_count(struct net_device *dev, int stringset)
 809 {
 810         if (stringset == ETH_SS_STATS)
 811                 return BATADV_CNT_NUM;
 812
 813         return -EOPNOTSUPP;
 814 }