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 } 663