net/batman-adv/soft-interface.c

   1 /* Copyright (C) 2007-2012 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
  41
  42 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  43 static void batadv_get_drvinfo(struct net_device *dev,
  44                                struct ethtool_drvinfo *info);
  45 static u32 batadv_get_msglevel(struct net_device *dev);
  46 static void batadv_set_msglevel(struct net_device *dev, u32 value);
  47 static u32 batadv_get_link(struct net_device *dev);
  48 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  49 static void batadv_get_ethtool_stats(struct net_device *dev,
  50                                      struct ethtool_stats *stats, u64 *data);
  51 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  52
  53 static const struct ethtool_ops batadv_ethtool_ops = {
  54         .get_settings = batadv_get_settings,
  55         .get_drvinfo = batadv_get_drvinfo,
  56         .get_msglevel = batadv_get_msglevel,
  57         .set_msglevel = batadv_set_msglevel,
  58         .get_link = batadv_get_link,
  59         .get_strings = batadv_get_strings,
  60         .get_ethtool_stats = batadv_get_ethtool_stats,
  61         .get_sset_count = batadv_get_sset_count,
  62 };
  63
  64 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  65 {
  66         int result;
  67
  68         /* TODO: We must check if we can release all references to non-payload
  69          * data using skb_header_release in our skbs to allow skb_cow_header to
  70          * work optimally. This means that those skbs are not allowed to read
  71          * or write any data which is before the current position of skb->data
  72          * after that call and thus allow other skbs with the same data buffer
  73          * to write freely in that area.
  74          */
  75         result = skb_cow_head(skb, len);
  76         if (result < 0)
  77                 return result;
  78
  79         skb_push(skb, len);
  80         return 0;
  81 }
  82
  83 static int batadv_interface_open(struct net_device *dev)
  84 {
  85         netif_start_queue(dev);
  86         return 0;
  87 }
  88
  89 static int batadv_interface_release(struct net_device *dev)
  90 {
  91         netif_stop_queue(dev);
  92         return 0;
  93 }
  94
  95 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
  96 {
  97         struct batadv_priv *bat_priv = netdev_priv(dev);
  98         struct net_device_stats *stats = &bat_priv->stats;
  99
 100         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 101         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 102         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 103         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 104         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 105         return stats;
 106 }
 107
 108 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 109 {
 110         struct batadv_priv *bat_priv = netdev_priv(dev);
 111         struct sockaddr *addr = p;
 112         uint8_t old_addr[ETH_ALEN];
 113
 114         if (!is_valid_ether_addr(addr->sa_data))
 115                 return -EADDRNOTAVAIL;
 116
 117         memcpy(old_addr, dev->dev_addr, ETH_ALEN);
 118         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 119
 120         /* only modify transtable if it has been initialized before */
 121         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 122                 batadv_tt_local_remove(bat_priv, old_addr,
 123                                        "mac address changed", false);
 124                 batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
 125         }
 126
 127         dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 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         short vid __maybe_unused = -1;
 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         /* Register the client MAC in the transtable */
 184         batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 185
 186         /* don't accept stp packets. STP does not help in meshes.
 187          * better use the bridge loop avoidance ...
 188          *
 189          * The same goes for ECTP sent at least by some Cisco Switches,
 190          * it might confuse the mesh when used with bridge loop avoidance.
 191          */
 192         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 193                 goto dropped;
 194
 195         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 196                 goto dropped;
 197
 198         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 199                 do_bcast = true;
 200
 201                 switch (atomic_read(&bat_priv->gw_mode)) {
 202                 case BATADV_GW_MODE_SERVER:
 203                         /* gateway servers should not send dhcp
 204                          * requests into the mesh
 205                          */
 206                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 207                         if (ret)
 208                                 goto dropped;
 209                         break;
 210                 case BATADV_GW_MODE_CLIENT:
 211                         /* gateway clients should send dhcp requests
 212                          * via unicast to their gateway
 213                          */
 214                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 215                         if (ret)
 216                                 do_bcast = false;
 217                         break;
 218                 case BATADV_GW_MODE_OFF:
 219                 default:
 220                         break;
 221                 }
 222         }
 223
 224         /* ethernet packet should be broadcasted */
 225         if (do_bcast) {
 226                 primary_if = batadv_primary_if_get_selected(bat_priv);
 227                 if (!primary_if)
 228                         goto dropped;
 229
 230                 /* in case of ARP request, we do not immediately broadcasti the
 231                  * packet, instead we first wait for DAT to try to retrieve the
 232                  * correct ARP entry
 233                  */
 234                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 235                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 236
 237                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 238                         goto dropped;
 239
 240                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 241                 bcast_packet->header.version = BATADV_COMPAT_VERSION;
 242                 bcast_packet->header.ttl = BATADV_TTL;
 243
 244                 /* batman packet type: broadcast */
 245                 bcast_packet->header.packet_type = BATADV_BCAST;
 246                 bcast_packet->reserved = 0;
 247
 248                 /* hw address of first interface is the orig mac because only
 249                  * this mac is known throughout the mesh
 250                  */
 251                 memcpy(bcast_packet->orig,
 252                        primary_if->net_dev->dev_addr, ETH_ALEN);
 253
 254                 /* set broadcast sequence number */
 255                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 256                 bcast_packet->seqno = htonl(seqno);
 257
 258                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 259
 260                 /* a copy is stored in the bcast list, therefore removing
 261                  * the original skb.
 262                  */
 263                 kfree_skb(skb);
 264
 265         /* unicast packet */
 266         } else {
 267                 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 268                         ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
 269                         if (ret)
 270                                 goto dropped;
 271                 }
 272
 273                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 274                         goto dropped;
 275
 276                 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 277
 278                 ret = batadv_unicast_send_skb(bat_priv, skb);
 279                 if (ret != 0)
 280                         goto dropped_freed;
 281         }
 282
 283         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 284         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 285         goto end;
 286
 287 dropped:
 288         kfree_skb(skb);
 289 dropped_freed:
 290         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 291 end:
 292         if (primary_if)
 293                 batadv_hardif_free_ref(primary_if);
 294         return NETDEV_TX_OK;
 295 }
 296
 297 void batadv_interface_rx(struct net_device *soft_iface,
 298                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 299                          int hdr_size, struct batadv_orig_node *orig_node)
 300 {
 301         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 302         struct ethhdr *ethhdr;
 303         struct vlan_ethhdr *vhdr;
 304         struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 305         short vid __maybe_unused = -1;
 306         __be16 ethertype = __constant_htons(ETH_P_BATMAN);
 307         bool is_bcast;
 308
 309         is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 310
 311         /* check if enough space is available for pulling, and pull */
 312         if (!pskb_may_pull(skb, hdr_size))
 313                 goto dropped;
 314
 315         skb_pull_rcsum(skb, hdr_size);
 316         skb_reset_mac_header(skb);
 317
 318         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 319
 320         switch (ntohs(ethhdr->h_proto)) {
 321         case ETH_P_8021Q:
 322                 vhdr = (struct vlan_ethhdr *)skb->data;
 323                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 324
 325                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 326                         break;
 327
 328                 /* fall through */
 329         case ETH_P_BATMAN:
 330                 goto dropped;
 331         }
 332
 333         /* skb->dev & skb->pkt_type are set here */
 334         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 335                 goto dropped;
 336         skb->protocol = eth_type_trans(skb, soft_iface);
 337
 338         /* should not be necessary anymore as we use skb_pull_rcsum()
 339          * TODO: please verify this and remove this TODO
 340          * -- Dec 21st 2009, Simon Wunderlich
 341          */
 342
 343         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 344
 345         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 346         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 347                            skb->len + ETH_HLEN);
 348
 349         soft_iface->last_rx = jiffies;
 350
 351         /* Let the bridge loop avoidance check the packet. If will
 352          * not handle it, we can safely push it up.
 353          */
 354         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 355                 goto out;
 356
 357         if (orig_node)
 358                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 359                                                      ethhdr->h_source);
 360
 361         if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 362                 goto dropped;
 363
 364         netif_rx(skb);
 365         goto out;
 366
 367 dropped:
 368         kfree_skb(skb);
 369 out:
 370         return;
 371 }
 372
 373 /* batman-adv network devices have devices nesting below it and are a special
 374  * "super class" of normal network devices; split their locks off into a
 375  * separate class since they always nest.
 376  */
 377 static struct lock_class_key batadv_netdev_xmit_lock_key;
 378 static struct lock_class_key batadv_netdev_addr_lock_key;
 379
 380 /**
 381  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 382  * @dev: device which owns the tx queue
 383  * @txq: tx queue to modify
 384  * @_unused: always NULL
 385  */
 386 static void batadv_set_lockdep_class_one(struct net_device *dev,
 387                                          struct netdev_queue *txq,
 388                                          void *_unused)
 389 {
 390         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 391 }
 392
 393 /**
 394  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 395  * @dev: network device to modify
 396  */
 397 static void batadv_set_lockdep_class(struct net_device *dev)
 398 {
 399         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 400         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 401 }
 402
 403 /**
 404  * batadv_softif_init - Late stage initialization of soft interface
 405  * @dev: registered network device to modify
 406  *
 407  * Returns error code on failures
 408  */
 409 static int batadv_softif_init(struct net_device *dev)
 410 {
 411         batadv_set_lockdep_class(dev);
 412
 413         return 0;
 414 }
 415
 416 static const struct net_device_ops batadv_netdev_ops = {
 417         .ndo_init = batadv_softif_init,
 418         .ndo_open = batadv_interface_open,
 419         .ndo_stop = batadv_interface_release,
 420         .ndo_get_stats = batadv_interface_stats,
 421         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 422         .ndo_change_mtu = batadv_interface_change_mtu,
 423         .ndo_start_xmit = batadv_interface_tx,
 424         .ndo_validate_addr = eth_validate_addr
 425 };
 426
 427 static void batadv_interface_setup(struct net_device *dev)
 428 {
 429         struct batadv_priv *priv = netdev_priv(dev);
 430
 431         ether_setup(dev);
 432
 433         dev->netdev_ops = &batadv_netdev_ops;
 434         dev->destructor = free_netdev;
 435         dev->tx_queue_len = 0;
 436
 437         /* can't call min_mtu, because the needed variables
 438          * have not been initialized yet
 439          */
 440         dev->mtu = ETH_DATA_LEN;
 441         /* reserve more space in the skbuff for our header */
 442         dev->hard_header_len = BATADV_HEADER_LEN;
 443
 444         /* generate random address */
 445         eth_hw_addr_random(dev);
 446
 447         SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 448
 449         memset(priv, 0, sizeof(*priv));
 450 }
 451
 452 struct net_device *batadv_softif_create(const char *name)
 453 {
 454         struct net_device *soft_iface;
 455         struct batadv_priv *bat_priv;
 456         int ret;
 457         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 458
 459         soft_iface = alloc_netdev(sizeof(*bat_priv), name,
 460                                   batadv_interface_setup);
 461
 462         if (!soft_iface)
 463                 goto out;
 464
 465         bat_priv = netdev_priv(soft_iface);
 466
 467         /* batadv_interface_stats() needs to be available as soon as
 468          * register_netdevice() has been called
 469          */
 470         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 471         if (!bat_priv->bat_counters)
 472                 goto free_soft_iface;
 473
 474         ret = register_netdevice(soft_iface);
 475         if (ret < 0) {
 476                 pr_err("Unable to register the batman interface '%s': %i\n",
 477                        name, ret);
 478                 goto free_bat_counters;
 479         }
 480
 481         atomic_set(&bat_priv->aggregated_ogms, 1);
 482         atomic_set(&bat_priv->bonding, 0);
 483         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 484 #ifdef CONFIG_BATMAN_ADV_DAT
 485         atomic_set(&bat_priv->distributed_arp_table, 1);
 486 #endif
 487         atomic_set(&bat_priv->ap_isolation, 0);
 488         atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
 489         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 490         atomic_set(&bat_priv->gw_sel_class, 20);
 491         atomic_set(&bat_priv->gw_bandwidth, 41);
 492         atomic_set(&bat_priv->orig_interval, 1000);
 493         atomic_set(&bat_priv->hop_penalty, 30);
 494         atomic_set(&bat_priv->log_level, 0);
 495         atomic_set(&bat_priv->fragmentation, 1);
 496         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 497         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 498
 499         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 500         atomic_set(&bat_priv->bcast_seqno, 1);
 501         atomic_set(&bat_priv->tt.vn, 0);
 502         atomic_set(&bat_priv->tt.local_changes, 0);
 503         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 504 #ifdef CONFIG_BATMAN_ADV_BLA
 505         atomic_set(&bat_priv->bla.num_requests, 0);
 506 #endif
 507         bat_priv->tt.last_changeset = NULL;
 508         bat_priv->tt.last_changeset_len = 0;
 509
 510         bat_priv->primary_if = NULL;
 511         bat_priv->num_ifaces = 0;
 512
 513         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 514         if (ret < 0)
 515                 goto unreg_soft_iface;
 516
 517         ret = batadv_sysfs_add_meshif(soft_iface);
 518         if (ret < 0)
 519                 goto unreg_soft_iface;
 520
 521         ret = batadv_debugfs_add_meshif(soft_iface);
 522         if (ret < 0)
 523                 goto unreg_sysfs;
 524
 525         ret = batadv_mesh_init(soft_iface);
 526         if (ret < 0)
 527                 goto unreg_debugfs;
 528
 529         return soft_iface;
 530
 531 unreg_debugfs:
 532         batadv_debugfs_del_meshif(soft_iface);
 533 unreg_sysfs:
 534         batadv_sysfs_del_meshif(soft_iface);
 535 unreg_soft_iface:
 536         free_percpu(bat_priv->bat_counters);
 537         unregister_netdevice(soft_iface);
 538         return NULL;
 539
 540 free_bat_counters:
 541         free_percpu(bat_priv->bat_counters);
 542 free_soft_iface:
 543         free_netdev(soft_iface);
 544 out:
 545         return NULL;
 546 }
 547
 548 void batadv_softif_destroy(struct net_device *soft_iface)
 549 {
 550         batadv_debugfs_del_meshif(soft_iface);
 551         batadv_sysfs_del_meshif(soft_iface);
 552         batadv_mesh_free(soft_iface);
 553         unregister_netdevice(soft_iface);
 554 }
 555
 556 int batadv_softif_is_valid(const struct net_device *net_dev)
 557 {
 558         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 559                 return 1;
 560
 561         return 0;
 562 }
 563
 564 /* ethtool */
 565 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 566 {
 567         cmd->supported = 0;
 568         cmd->advertising = 0;
 569         ethtool_cmd_speed_set(cmd, SPEED_10);
 570         cmd->duplex = DUPLEX_FULL;
 571         cmd->port = PORT_TP;
 572         cmd->phy_address = 0;
 573         cmd->transceiver = XCVR_INTERNAL;
 574         cmd->autoneg = AUTONEG_DISABLE;
 575         cmd->maxtxpkt = 0;
 576         cmd->maxrxpkt = 0;
 577
 578         return 0;
 579 }
 580
 581 static void batadv_get_drvinfo(struct net_device *dev,
 582                                struct ethtool_drvinfo *info)
 583 {
 584         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 585         strcpy(info->version, BATADV_SOURCE_VERSION);
 586         strcpy(info->fw_version, "N/A");
 587         strcpy(info->bus_info, "batman");
 588 }
 589
 590 static u32 batadv_get_msglevel(struct net_device *dev)
 591 {
 592         return -EOPNOTSUPP;
 593 }
 594
 595 static void batadv_set_msglevel(struct net_device *dev, u32 value)
 596 {
 597 }
 598
 599 static u32 batadv_get_link(struct net_device *dev)
 600 {
 601         return 1;
 602 }
 603
 604 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 605  * Declare each description string in struct.name[] to get fixed sized buffer
 606  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 607  */
 608 static const struct {
 609         const char name[ETH_GSTRING_LEN];
 610 } batadv_counters_strings[] = {
 611         { "tx" },
 612         { "tx_bytes" },
 613         { "tx_dropped" },
 614         { "rx" },
 615         { "rx_bytes" },
 616         { "forward" },
 617         { "forward_bytes" },
 618         { "mgmt_tx" },
 619         { "mgmt_tx_bytes" },
 620         { "mgmt_rx" },
 621         { "mgmt_rx_bytes" },
 622         { "tt_request_tx" },
 623         { "tt_request_rx" },
 624         { "tt_response_tx" },
 625         { "tt_response_rx" },
 626         { "tt_roam_adv_tx" },
 627         { "tt_roam_adv_rx" },
 628 #ifdef CONFIG_BATMAN_ADV_DAT
 629         { "dat_get_tx" },
 630         { "dat_get_rx" },
 631         { "dat_put_tx" },
 632         { "dat_put_rx" },
 633         { "dat_cached_reply_tx" },
 634 #endif
 635 };
 636
 637 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 638                                uint8_t *data)
 639 {
 640         if (stringset == ETH_SS_STATS)
 641                 memcpy(data, batadv_counters_strings,
 642                        sizeof(batadv_counters_strings));
 643 }
 644
 645 static void batadv_get_ethtool_stats(struct net_device *dev,
 646                                      struct ethtool_stats *stats,
 647                                      uint64_t *data)
 648 {
 649         struct batadv_priv *bat_priv = netdev_priv(dev);
 650         int i;
 651
 652         for (i = 0; i < BATADV_CNT_NUM; i++)
 653                 data[i] = batadv_sum_counter(bat_priv, i);
 654 }
 655
 656 static int batadv_get_sset_count(struct net_device *dev, int stringset)
 657 {
 658         if (stringset == ETH_SS_STATS)
 659                 return BATADV_CNT_NUM;
 660
 661         return -EOPNOTSUPP;
 662 }