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