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