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 "bridge_loop_avoidance.h"
  38 #include "network-coding.h"
  39
  40
  41 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  42 static void batadv_get_drvinfo(struct net_device *dev,
  43                                struct ethtool_drvinfo *info);
  44 static u32 batadv_get_msglevel(struct net_device *dev);
  45 static void batadv_set_msglevel(struct net_device *dev, u32 value);
  46 static u32 batadv_get_link(struct net_device *dev);
  47 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  48 static void batadv_get_ethtool_stats(struct net_device *dev,
  49                                      struct ethtool_stats *stats, u64 *data);
  50 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  51
  52 static const struct ethtool_ops batadv_ethtool_ops = {
  53         .get_settings = batadv_get_settings,
  54         .get_drvinfo = batadv_get_drvinfo,
  55         .get_msglevel = batadv_get_msglevel,
  56         .set_msglevel = batadv_set_msglevel,
  57         .get_link = batadv_get_link,
  58         .get_strings = batadv_get_strings,
  59         .get_ethtool_stats = batadv_get_ethtool_stats,
  60         .get_sset_count = batadv_get_sset_count,
  61 };
  62
  63 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  64 {
  65         int result;
  66
  67         /* TODO: We must check if we can release all references to non-payload
  68          * data using skb_header_release in our skbs to allow skb_cow_header to
  69          * work optimally. This means that those skbs are not allowed to read
  70          * or write any data which is before the current position of skb->data
  71          * after that call and thus allow other skbs with the same data buffer
  72          * to write freely in that area.
  73          */
  74         result = skb_cow_head(skb, len);
  75         if (result < 0)
  76                 return result;
  77
  78         skb_push(skb, len);
  79         return 0;
  80 }
  81
  82 static int batadv_interface_open(struct net_device *dev)
  83 {
  84         netif_start_queue(dev);
  85         return 0;
  86 }
  87
  88 static int batadv_interface_release(struct net_device *dev)
  89 {
  90         netif_stop_queue(dev);
  91         return 0;
  92 }
  93
  94 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
  95 {
  96         struct batadv_priv *bat_priv = netdev_priv(dev);
  97         struct net_device_stats *stats = &bat_priv->stats;
  98
  99         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 100         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 101         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 102         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 103         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 104         return stats;
 105 }
 106
 107 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 108 {
 109         struct batadv_priv *bat_priv = netdev_priv(dev);
 110         struct sockaddr *addr = p;
 111         uint8_t old_addr[ETH_ALEN];
 112
 113         if (!is_valid_ether_addr(addr->sa_data))
 114                 return -EADDRNOTAVAIL;
 115
 116         memcpy(old_addr, dev->dev_addr, ETH_ALEN);
 117         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 118
 119         /* only modify transtable if it has been initialized before */
 120         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 121                 batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS,
 122                                        "mac address changed", false);
 123                 batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS,
 124                                     BATADV_NULL_IFINDEX);
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 131 {
 132         /* check ranges */
 133         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 134                 return -EINVAL;
 135
 136         dev->mtu = new_mtu;
 137
 138         return 0;
 139 }
 140
 141 /**
 142  * batadv_interface_set_rx_mode - set the rx mode of a device
 143  * @dev: registered network device to modify
 144  *
 145  * We do not actually need to set any rx filters for the virtual batman
 146  * soft interface. However a dummy handler enables a user to set static
 147  * multicast listeners for instance.
 148  */
 149 static void batadv_interface_set_rx_mode(struct net_device *dev)
 150 {
 151 }
 152
 153 static int batadv_interface_tx(struct sk_buff *skb,
 154                                struct net_device *soft_iface)
 155 {
 156         struct ethhdr *ethhdr;
 157         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 158         struct batadv_hard_iface *primary_if = NULL;
 159         struct batadv_bcast_packet *bcast_packet;
 160         __be16 ethertype = htons(ETH_P_BATMAN);
 161         static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 162                                                    0x00, 0x00};
 163         static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 164                                                     0x00, 0x00};
 165         struct vlan_ethhdr *vhdr;
 166         unsigned int header_len = 0;
 167         int data_len = skb->len, ret;
 168         unsigned long brd_delay = 1;
 169         bool do_bcast = false, client_added;
 170         unsigned short vid;
 171         uint32_t seqno;
 172
 173         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 174                 goto dropped;
 175
 176         soft_iface->trans_start = jiffies;
 177         vid = batadv_get_vid(skb, 0);
 178         ethhdr = (struct ethhdr *)skb->data;
 179
 180         switch (ntohs(ethhdr->h_proto)) {
 181         case ETH_P_8021Q:
 182                 vhdr = (struct vlan_ethhdr *)skb->data;
 183
 184                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 185                         break;
 186
 187                 /* fall through */
 188         case ETH_P_BATMAN:
 189                 goto dropped;
 190         }
 191
 192         if (batadv_bla_tx(bat_priv, skb, vid))
 193                 goto dropped;
 194
 195         /* skb->data might have been reallocated by batadv_bla_tx() */
 196         ethhdr = (struct ethhdr *)skb->data;
 197
 198         /* Register the client MAC in the transtable */
 199         if (!is_multicast_ether_addr(ethhdr->h_source)) {
 200                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 201                                                    vid, skb->skb_iif);
 202                 if (!client_added)
 203                         goto dropped;
 204         }
 205
 206         /* don't accept stp packets. STP does not help in meshes.
 207          * better use the bridge loop avoidance ...
 208          *
 209          * The same goes for ECTP sent at least by some Cisco Switches,
 210          * it might confuse the mesh when used with bridge loop avoidance.
 211          */
 212         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 213                 goto dropped;
 214
 215         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 216                 goto dropped;
 217
 218         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 219                 do_bcast = true;
 220
 221                 switch (atomic_read(&bat_priv->gw_mode)) {
 222                 case BATADV_GW_MODE_SERVER:
 223                         /* gateway servers should not send dhcp
 224                          * requests into the mesh
 225                          */
 226                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 227                         if (ret)
 228                                 goto dropped;
 229                         break;
 230                 case BATADV_GW_MODE_CLIENT:
 231                         /* gateway clients should send dhcp requests
 232                          * via unicast to their gateway
 233                          */
 234                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 235                         if (ret)
 236                                 do_bcast = false;
 237                         break;
 238                 case BATADV_GW_MODE_OFF:
 239                 default:
 240                         break;
 241                 }
 242
 243                 /* reminder: ethhdr might have become unusable from here on
 244                  * (batadv_gw_is_dhcp_target() might have reallocated skb data)
 245                  */
 246         }
 247
 248         batadv_skb_set_priority(skb, 0);
 249
 250         /* ethernet packet should be broadcasted */
 251         if (do_bcast) {
 252                 primary_if = batadv_primary_if_get_selected(bat_priv);
 253                 if (!primary_if)
 254                         goto dropped;
 255
 256                 /* in case of ARP request, we do not immediately broadcasti the
 257                  * packet, instead we first wait for DAT to try to retrieve the
 258                  * correct ARP entry
 259                  */
 260                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 261                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 262
 263                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 264                         goto dropped;
 265
 266                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 267                 bcast_packet->header.version = BATADV_COMPAT_VERSION;
 268                 bcast_packet->header.ttl = BATADV_TTL;
 269
 270                 /* batman packet type: broadcast */
 271                 bcast_packet->header.packet_type = BATADV_BCAST;
 272                 bcast_packet->reserved = 0;
 273
 274                 /* hw address of first interface is the orig mac because only
 275                  * this mac is known throughout the mesh
 276                  */
 277                 memcpy(bcast_packet->orig,
 278                        primary_if->net_dev->dev_addr, ETH_ALEN);
 279
 280                 /* set broadcast sequence number */
 281                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 282                 bcast_packet->seqno = htonl(seqno);
 283
 284                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 285
 286                 /* a copy is stored in the bcast list, therefore removing
 287                  * the original skb.
 288                  */
 289                 kfree_skb(skb);
 290
 291         /* unicast packet */
 292         } else {
 293                 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 294                         ret = batadv_gw_out_of_range(bat_priv, skb);
 295                         if (ret)
 296                                 goto dropped;
 297                 }
 298
 299                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 300                         goto dropped;
 301
 302                 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 303
 304                 if (is_multicast_ether_addr(ethhdr->h_dest))
 305                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 306                 else
 307                         ret = batadv_send_skb_via_tt(bat_priv, skb, vid);
 308
 309                 if (ret == NET_XMIT_DROP)
 310                         goto dropped_freed;
 311         }
 312
 313         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 314         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 315         goto end;
 316
 317 dropped:
 318         kfree_skb(skb);
 319 dropped_freed:
 320         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 321 end:
 322         if (primary_if)
 323                 batadv_hardif_free_ref(primary_if);
 324         return NETDEV_TX_OK;
 325 }
 326
 327 void batadv_interface_rx(struct net_device *soft_iface,
 328                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 329                          int hdr_size, struct batadv_orig_node *orig_node)
 330 {
 331         struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 332         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 333         __be16 ethertype = htons(ETH_P_BATMAN);
 334         struct vlan_ethhdr *vhdr;
 335         struct ethhdr *ethhdr;
 336         unsigned short vid;
 337         bool is_bcast;
 338
 339         is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 340
 341         /* check if enough space is available for pulling, and pull */
 342         if (!pskb_may_pull(skb, hdr_size))
 343                 goto dropped;
 344
 345         skb_pull_rcsum(skb, hdr_size);
 346         skb_reset_mac_header(skb);
 347
 348         vid = batadv_get_vid(skb, hdr_size);
 349         ethhdr = eth_hdr(skb);
 350
 351         switch (ntohs(ethhdr->h_proto)) {
 352         case ETH_P_8021Q:
 353                 vhdr = (struct vlan_ethhdr *)skb->data;
 354
 355                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 356                         break;
 357
 358                 /* fall through */
 359         case ETH_P_BATMAN:
 360                 goto dropped;
 361         }
 362
 363         /* skb->dev & skb->pkt_type are set here */
 364         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 365                 goto dropped;
 366         skb->protocol = eth_type_trans(skb, soft_iface);
 367
 368         /* should not be necessary anymore as we use skb_pull_rcsum()
 369          * TODO: please verify this and remove this TODO
 370          * -- Dec 21st 2009, Simon Wunderlich
 371          */
 372
 373         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 374
 375         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 376         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 377                            skb->len + ETH_HLEN);
 378
 379         soft_iface->last_rx = jiffies;
 380
 381         /* Let the bridge loop avoidance check the packet. If will
 382          * not handle it, we can safely push it up.
 383          */
 384         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 385                 goto out;
 386
 387         if (orig_node)
 388                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 389                                                      ethhdr->h_source, vid);
 390
 391         if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest,
 392                                   vid))
 393                 goto dropped;
 394
 395         netif_rx(skb);
 396         goto out;
 397
 398 dropped:
 399         kfree_skb(skb);
 400 out:
 401         return;
 402 }
 403
 404 /**
 405  * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
 406  *  possibly free it
 407  * @softif_vlan: the vlan object to release
 408  */
 409 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan)
 410 {
 411         if (atomic_dec_and_test(&softif_vlan->refcount))
 412                 kfree_rcu(softif_vlan, rcu);
 413 }
 414
 415 /**
 416  * batadv_softif_vlan_get - get the vlan object for a specific vid
 417  * @bat_priv: the bat priv with all the soft interface information
 418  * @vid: the identifier of the vlan object to retrieve
 419  *
 420  * Returns the private data of the vlan matching the vid passed as argument or
 421  * NULL otherwise. The refcounter of the returned object is incremented by 1.
 422  */
 423 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 424                                                   unsigned short vid)
 425 {
 426         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 427
 428         rcu_read_lock();
 429         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 430                 if (vlan_tmp->vid != vid)
 431                         continue;
 432
 433                 if (!atomic_inc_not_zero(&vlan_tmp->refcount))
 434                         continue;
 435
 436                 vlan = vlan_tmp;
 437                 break;
 438         }
 439         rcu_read_unlock();
 440
 441         return vlan;
 442 }
 443
 444 /**
 445  * batadv_create_vlan - allocate the needed resources for a new vlan
 446  * @bat_priv: the bat priv with all the soft interface information
 447  * @vid: the VLAN identifier
 448  *
 449  * Returns 0 on success, a negative error otherwise.
 450  */
 451 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 452 {
 453         struct batadv_softif_vlan *vlan;
 454         int err;
 455
 456         vlan = batadv_softif_vlan_get(bat_priv, vid);
 457         if (vlan) {
 458                 batadv_softif_vlan_free_ref(vlan);
 459                 return -EEXIST;
 460         }
 461
 462         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 463         if (!vlan)
 464                 return -ENOMEM;
 465
 466         vlan->vid = vid;
 467         atomic_set(&vlan->refcount, 1);
 468
 469         atomic_set(&vlan->ap_isolation, 0);
 470
 471         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 472         if (err) {
 473                 kfree(vlan);
 474                 return err;
 475         }
 476
 477         /* add a new TT local entry. This one will be marked with the NOPURGE
 478          * flag
 479          */
 480         batadv_tt_local_add(bat_priv->soft_iface,
 481                             bat_priv->soft_iface->dev_addr, vid,
 482                             BATADV_NULL_IFINDEX);
 483
 484         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 485         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 486         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 487
 488         return 0;
 489 }
 490
 491 /**
 492  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
 493  * @bat_priv: the bat priv with all the soft interface information
 494  * @vlan: the object to remove
 495  */
 496 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 497                                        struct batadv_softif_vlan *vlan)
 498 {
 499         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 500         hlist_del_rcu(&vlan->list);
 501         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 502
 503         batadv_sysfs_del_vlan(bat_priv, vlan);
 504
 505         /* explicitly remove the associated TT local entry because it is marked
 506          * with the NOPURGE flag
 507          */
 508         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 509                                vlan->vid, "vlan interface destroyed", false);
 510
 511         batadv_softif_vlan_free_ref(vlan);
 512 }
 513
 514 /**
 515  * batadv_interface_add_vid - ndo_add_vid API implementation
 516  * @dev: the netdev of the mesh interface
 517  * @vid: identifier of the new vlan
 518  *
 519  * Set up all the internal structures for handling the new vlan on top of the
 520  * mesh interface
 521  *
 522  * Returns 0 on success or a negative error code in case of failure.
 523  */
 524 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 525                                     unsigned short vid)
 526 {
 527         struct batadv_priv *bat_priv = netdev_priv(dev);
 528
 529         /* only 802.1Q vlans are supported.
 530          * batman-adv does not know how to handle other types
 531          */
 532         if (proto != htons(ETH_P_8021Q))
 533                 return -EINVAL;
 534
 535         vid |= BATADV_VLAN_HAS_TAG;
 536
 537         return batadv_softif_create_vlan(bat_priv, vid);
 538 }
 539
 540 /**
 541  * batadv_interface_kill_vid - ndo_kill_vid API implementation
 542  * @dev: the netdev of the mesh interface
 543  * @vid: identifier of the deleted vlan
 544  *
 545  * Destroy all the internal structures used to handle the vlan identified by vid
 546  * on top of the mesh interface
 547  *
 548  * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 549  * or -ENOENT if the specified vlan id wasn't registered.
 550  */
 551 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 552                                      unsigned short vid)
 553 {
 554         struct batadv_priv *bat_priv = netdev_priv(dev);
 555         struct batadv_softif_vlan *vlan;
 556
 557         /* only 802.1Q vlans are supported. batman-adv does not know how to
 558          * handle other types
 559          */
 560         if (proto != htons(ETH_P_8021Q))
 561                 return -EINVAL;
 562
 563         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 564         if (!vlan)
 565                 return -ENOENT;
 566
 567         batadv_softif_destroy_vlan(bat_priv, vlan);
 568
 569         /* finally free the vlan object */
 570         batadv_softif_vlan_free_ref(vlan);
 571
 572         return 0;
 573 }
 574
 575 /* batman-adv network devices have devices nesting below it and are a special
 576  * "super class" of normal network devices; split their locks off into a
 577  * separate class since they always nest.
 578  */
 579 static struct lock_class_key batadv_netdev_xmit_lock_key;
 580 static struct lock_class_key batadv_netdev_addr_lock_key;
 581
 582 /**
 583  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 584  * @dev: device which owns the tx queue
 585  * @txq: tx queue to modify
 586  * @_unused: always NULL
 587  */
 588 static void batadv_set_lockdep_class_one(struct net_device *dev,
 589                                          struct netdev_queue *txq,
 590                                          void *_unused)
 591 {
 592         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 593 }
 594
 595 /**
 596  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 597  * @dev: network device to modify
 598  */
 599 static void batadv_set_lockdep_class(struct net_device *dev)
 600 {
 601         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 602         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 603 }
 604
 605 /**
 606  * batadv_softif_destroy_finish - cleans up the remains of a softif
 607  * @work: work queue item
 608  *
 609  * Free the parts of the soft interface which can not be removed under
 610  * rtnl lock (to prevent deadlock situations).
 611  */
 612 static void batadv_softif_destroy_finish(struct work_struct *work)
 613 {
 614         struct batadv_softif_vlan *vlan;
 615         struct batadv_priv *bat_priv;
 616         struct net_device *soft_iface;
 617
 618         bat_priv = container_of(work, struct batadv_priv,
 619                                 cleanup_work);
 620         soft_iface = bat_priv->soft_iface;
 621
 622         /* destroy the "untagged" VLAN */
 623         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
 624         if (vlan) {
 625                 batadv_softif_destroy_vlan(bat_priv, vlan);
 626                 batadv_softif_vlan_free_ref(vlan);
 627         }
 628
 629         batadv_sysfs_del_meshif(soft_iface);
 630
 631         rtnl_lock();
 632         unregister_netdevice(soft_iface);
 633         rtnl_unlock();
 634 }
 635
 636 /**
 637  * batadv_softif_init_late - late stage initialization of soft interface
 638  * @dev: registered network device to modify
 639  *
 640  * Returns error code on failures
 641  */
 642 static int batadv_softif_init_late(struct net_device *dev)
 643 {
 644         struct batadv_priv *bat_priv;
 645         uint32_t random_seqno;
 646         int ret;
 647         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 648
 649         batadv_set_lockdep_class(dev);
 650
 651         bat_priv = netdev_priv(dev);
 652         bat_priv->soft_iface = dev;
 653         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 654
 655         /* batadv_interface_stats() needs to be available as soon as
 656          * register_netdevice() has been called
 657          */
 658         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 659         if (!bat_priv->bat_counters)
 660                 return -ENOMEM;
 661
 662         atomic_set(&bat_priv->aggregated_ogms, 1);
 663         atomic_set(&bat_priv->bonding, 0);
 664 #ifdef CONFIG_BATMAN_ADV_BLA
 665         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 666 #endif
 667 #ifdef CONFIG_BATMAN_ADV_DAT
 668         atomic_set(&bat_priv->distributed_arp_table, 1);
 669 #endif
 670         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 671         atomic_set(&bat_priv->gw_sel_class, 20);
 672         atomic_set(&bat_priv->gw.bandwidth_down, 100);
 673         atomic_set(&bat_priv->gw.bandwidth_up, 20);
 674         atomic_set(&bat_priv->orig_interval, 1000);
 675         atomic_set(&bat_priv->hop_penalty, 30);
 676 #ifdef CONFIG_BATMAN_ADV_DEBUG
 677         atomic_set(&bat_priv->log_level, 0);
 678 #endif
 679         atomic_set(&bat_priv->fragmentation, 1);
 680         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 681         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 682         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 683
 684         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 685         atomic_set(&bat_priv->bcast_seqno, 1);
 686         atomic_set(&bat_priv->tt.vn, 0);
 687         atomic_set(&bat_priv->tt.local_changes, 0);
 688         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 689 #ifdef CONFIG_BATMAN_ADV_BLA
 690         atomic_set(&bat_priv->bla.num_requests, 0);
 691 #endif
 692         bat_priv->tt.last_changeset = NULL;
 693         bat_priv->tt.last_changeset_len = 0;
 694
 695         /* randomize initial seqno to avoid collision */
 696         get_random_bytes(&random_seqno, sizeof(random_seqno));
 697         atomic_set(&bat_priv->frag_seqno, random_seqno);
 698
 699         bat_priv->primary_if = NULL;
 700         bat_priv->num_ifaces = 0;
 701
 702         batadv_nc_init_bat_priv(bat_priv);
 703
 704         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 705         if (ret < 0)
 706                 goto free_bat_counters;
 707
 708         ret = batadv_debugfs_add_meshif(dev);
 709         if (ret < 0)
 710                 goto free_bat_counters;
 711
 712         ret = batadv_mesh_init(dev);
 713         if (ret < 0)
 714                 goto unreg_debugfs;
 715
 716         return 0;
 717
 718 unreg_debugfs:
 719         batadv_debugfs_del_meshif(dev);
 720 free_bat_counters:
 721         free_percpu(bat_priv->bat_counters);
 722         bat_priv->bat_counters = NULL;
 723
 724         return ret;
 725 }
 726
 727 /**
 728  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
 729  * @dev: batadv_soft_interface used as master interface
 730  * @slave_dev: net_device which should become the slave interface
 731  *
 732  * Return 0 if successful or error otherwise.
 733  */
 734 static int batadv_softif_slave_add(struct net_device *dev,
 735                                    struct net_device *slave_dev)
 736 {
 737         struct batadv_hard_iface *hard_iface;
 738         int ret = -EINVAL;
 739
 740         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 741         if (!hard_iface || hard_iface->soft_iface != NULL)
 742                 goto out;
 743
 744         ret = batadv_hardif_enable_interface(hard_iface, dev->name);
 745
 746 out:
 747         if (hard_iface)
 748                 batadv_hardif_free_ref(hard_iface);
 749         return ret;
 750 }
 751
 752 /**
 753  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
 754  * @dev: batadv_soft_interface used as master interface
 755  * @slave_dev: net_device which should be removed from the master interface
 756  *
 757  * Return 0 if successful or error otherwise.
 758  */
 759 static int batadv_softif_slave_del(struct net_device *dev,
 760                                    struct net_device *slave_dev)
 761 {
 762         struct batadv_hard_iface *hard_iface;
 763         int ret = -EINVAL;
 764
 765         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 766
 767         if (!hard_iface || hard_iface->soft_iface != dev)
 768                 goto out;
 769
 770         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 771         ret = 0;
 772
 773 out:
 774         if (hard_iface)
 775                 batadv_hardif_free_ref(hard_iface);
 776         return ret;
 777 }
 778
 779 static const struct net_device_ops batadv_netdev_ops = {
 780         .ndo_init = batadv_softif_init_late,
 781         .ndo_open = batadv_interface_open,
 782         .ndo_stop = batadv_interface_release,
 783         .ndo_get_stats = batadv_interface_stats,
 784         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 785         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 786         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 787         .ndo_change_mtu = batadv_interface_change_mtu,
 788         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 789         .ndo_start_xmit = batadv_interface_tx,
 790         .ndo_validate_addr = eth_validate_addr,
 791         .ndo_add_slave = batadv_softif_slave_add,
 792         .ndo_del_slave = batadv_softif_slave_del,
 793 };
 794
 795 /**
 796  * batadv_softif_free - Deconstructor of batadv_soft_interface
 797  * @dev: Device to cleanup and remove
 798  */
 799 static void batadv_softif_free(struct net_device *dev)
 800 {
 801         batadv_debugfs_del_meshif(dev);
 802         batadv_mesh_free(dev);
 803
 804         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
 805          * their tasks. Wait for them all to be finished before freeing the
 806          * netdev and its private data (bat_priv)
 807          */
 808         rcu_barrier();
 809
 810         free_netdev(dev);
 811 }
 812
 813 /**
 814  * batadv_softif_init_early - early stage initialization of soft interface
 815  * @dev: registered network device to modify
 816  */
 817 static void batadv_softif_init_early(struct net_device *dev)
 818 {
 819         struct batadv_priv *priv = netdev_priv(dev);
 820
 821         ether_setup(dev);
 822
 823         dev->netdev_ops = &batadv_netdev_ops;
 824         dev->destructor = batadv_softif_free;
 825         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 826         dev->tx_queue_len = 0;
 827
 828         /* can't call min_mtu, because the needed variables
 829          * have not been initialized yet
 830          */
 831         dev->mtu = ETH_DATA_LEN;
 832         /* reserve more space in the skbuff for our header */
 833         dev->hard_header_len = batadv_max_header_len();
 834
 835         /* generate random address */
 836         eth_hw_addr_random(dev);
 837
 838         SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 839
 840         memset(priv, 0, sizeof(*priv));
 841 }
 842
 843 struct net_device *batadv_softif_create(const char *name)
 844 {
 845         struct net_device *soft_iface;
 846         int ret;
 847
 848         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
 849                                   batadv_softif_init_early);
 850         if (!soft_iface)
 851                 return NULL;
 852
 853         soft_iface->rtnl_link_ops = &batadv_link_ops;
 854
 855         ret = register_netdevice(soft_iface);
 856         if (ret < 0) {
 857                 pr_err("Unable to register the batman interface '%s': %i\n",
 858                        name, ret);
 859                 free_netdev(soft_iface);
 860                 return NULL;
 861         }
 862
 863         return soft_iface;
 864 }
 865
 866 /**
 867  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
 868  * @soft_iface: the to-be-removed batman-adv interface
 869  */
 870 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 871 {
 872         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 873
 874         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 875 }
 876
 877 /**
 878  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
 879  * @soft_iface: the to-be-removed batman-adv interface
 880  * @head: list pointer
 881  */
 882 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 883                                           struct list_head *head)
 884 {
 885         struct batadv_hard_iface *hard_iface;
 886
 887         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 888                 if (hard_iface->soft_iface == soft_iface)
 889                         batadv_hardif_disable_interface(hard_iface,
 890                                                         BATADV_IF_CLEANUP_KEEP);
 891         }
 892
 893         batadv_sysfs_del_meshif(soft_iface);
 894         unregister_netdevice_queue(soft_iface, head);
 895 }
 896
 897 int batadv_softif_is_valid(const struct net_device *net_dev)
 898 {
 899         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 900                 return 1;
 901
 902         return 0;
 903 }
 904
 905 struct rtnl_link_ops batadv_link_ops __read_mostly = {
 906         .kind           = "batadv",
 907         .priv_size      = sizeof(struct batadv_priv),
 908         .setup          = batadv_softif_init_early,
 909         .dellink        = batadv_softif_destroy_netlink,
 910 };
 911
 912 /* ethtool */
 913 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 914 {
 915         cmd->supported = 0;
 916         cmd->advertising = 0;
 917         ethtool_cmd_speed_set(cmd, SPEED_10);
 918         cmd->duplex = DUPLEX_FULL;
 919         cmd->port = PORT_TP;
 920         cmd->phy_address = 0;
 921         cmd->transceiver = XCVR_INTERNAL;
 922         cmd->autoneg = AUTONEG_DISABLE;
 923         cmd->maxtxpkt = 0;
 924         cmd->maxrxpkt = 0;
 925
 926         return 0;
 927 }
 928
 929 static void batadv_get_drvinfo(struct net_device *dev,
 930                                struct ethtool_drvinfo *info)
 931 {
 932         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 933         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 934         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 935         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
 936 }
 937
 938 static u32 batadv_get_msglevel(struct net_device *dev)
 939 {
 940         return -EOPNOTSUPP;
 941 }
 942
 943 static void batadv_set_msglevel(struct net_device *dev, u32 value)
 944 {
 945 }
 946
 947 static u32 batadv_get_link(struct net_device *dev)
 948 {
 949         return 1;
 950 }
 951
 952 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 953  * Declare each description string in struct.name[] to get fixed sized buffer
 954  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 955  */
 956 static const struct {
 957         const char name[ETH_GSTRING_LEN];
 958 } batadv_counters_strings[] = {
 959         { "tx" },
 960         { "tx_bytes" },
 961         { "tx_dropped" },
 962         { "rx" },
 963         { "rx_bytes" },
 964         { "forward" },
 965         { "forward_bytes" },
 966         { "mgmt_tx" },
 967         { "mgmt_tx_bytes" },
 968         { "mgmt_rx" },
 969         { "mgmt_rx_bytes" },
 970         { "frag_tx" },
 971         { "frag_tx_bytes" },
 972         { "frag_rx" },
 973         { "frag_rx_bytes" },
 974         { "frag_fwd" },
 975         { "frag_fwd_bytes" },
 976         { "tt_request_tx" },
 977         { "tt_request_rx" },
 978         { "tt_response_tx" },
 979         { "tt_response_rx" },
 980         { "tt_roam_adv_tx" },
 981         { "tt_roam_adv_rx" },
 982 #ifdef CONFIG_BATMAN_ADV_DAT
 983         { "dat_get_tx" },
 984         { "dat_get_rx" },
 985         { "dat_put_tx" },
 986         { "dat_put_rx" },
 987         { "dat_cached_reply_tx" },
 988 #endif
 989 #ifdef CONFIG_BATMAN_ADV_NC
 990         { "nc_code" },
 991         { "nc_code_bytes" },
 992         { "nc_recode" },
 993         { "nc_recode_bytes" },
 994         { "nc_buffer" },
 995         { "nc_decode" },
 996         { "nc_decode_bytes" },
 997         { "nc_decode_failed" },
 998         { "nc_sniffed" },
 999 #endif
1000 };
1001
1002 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
1003                                uint8_t *data)
1004 {
1005         if (stringset == ETH_SS_STATS)
1006                 memcpy(data, batadv_counters_strings,
1007                        sizeof(batadv_counters_strings));
1008 }
1009
1010 static void batadv_get_ethtool_stats(struct net_device *dev,
1011                                      struct ethtool_stats *stats,
1012                                      uint64_t *data)
1013 {
1014         struct batadv_priv *bat_priv = netdev_priv(dev);
1015         int i;
1016
1017         for (i = 0; i < BATADV_CNT_NUM; i++)
1018                 data[i] = batadv_sum_counter(bat_priv, i);
1019 }
1020
1021 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1022 {
1023         if (stringset == ETH_SS_STATS)
1024                 return BATADV_CNT_NUM;
1025
1026         return -EOPNOTSUPP;
1027 }