net/batman-adv/soft-interface.c

   1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "soft-interface.h"
  20 #include "hard-interface.h"
  21 #include "distributed-arp-table.h"
  22 #include "routing.h"
  23 #include "send.h"
  24 #include "debugfs.h"
  25 #include "translation-table.h"
  26 #include "hash.h"
  27 #include "gateway_common.h"
  28 #include "gateway_client.h"
  29 #include "sysfs.h"
  30 #include "originator.h"
  31 #include <linux/slab.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/if_vlan.h>
  35 #include "multicast.h"
  36 #include "bridge_loop_avoidance.h"
  37 #include "network-coding.h"
  38
  39
  40 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  41 static void batadv_get_drvinfo(struct net_device *dev,
  42                                struct ethtool_drvinfo *info);
  43 static u32 batadv_get_msglevel(struct net_device *dev);
  44 static void batadv_set_msglevel(struct net_device *dev, u32 value);
  45 static u32 batadv_get_link(struct net_device *dev);
  46 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  47 static void batadv_get_ethtool_stats(struct net_device *dev,
  48                                      struct ethtool_stats *stats, u64 *data);
  49 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  50
  51 static const struct ethtool_ops batadv_ethtool_ops = {
  52         .get_settings = batadv_get_settings,
  53         .get_drvinfo = batadv_get_drvinfo,
  54         .get_msglevel = batadv_get_msglevel,
  55         .set_msglevel = batadv_set_msglevel,
  56         .get_link = batadv_get_link,
  57         .get_strings = batadv_get_strings,
  58         .get_ethtool_stats = batadv_get_ethtool_stats,
  59         .get_sset_count = batadv_get_sset_count,
  60 };
  61
  62 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  63 {
  64         int result;
  65
  66         /* TODO: We must check if we can release all references to non-payload
  67          * data using skb_header_release in our skbs to allow skb_cow_header to
  68          * work optimally. This means that those skbs are not allowed to read
  69          * or write any data which is before the current position of skb->data
  70          * after that call and thus allow other skbs with the same data buffer
  71          * to write freely in that area.
  72          */
  73         result = skb_cow_head(skb, len);
  74         if (result < 0)
  75                 return result;
  76
  77         skb_push(skb, len);
  78         return 0;
  79 }
  80
  81 static int batadv_interface_open(struct net_device *dev)
  82 {
  83         netif_start_queue(dev);
  84         return 0;
  85 }
  86
  87 static int batadv_interface_release(struct net_device *dev)
  88 {
  89         netif_stop_queue(dev);
  90         return 0;
  91 }
  92
  93 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
  94 {
  95         struct batadv_priv *bat_priv = netdev_priv(dev);
  96         struct net_device_stats *stats = &bat_priv->stats;
  97
  98         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
  99         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 100         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 101         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 102         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 103         return stats;
 104 }
 105
 106 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 107 {
 108         struct batadv_priv *bat_priv = netdev_priv(dev);
 109         struct sockaddr *addr = p;
 110         uint8_t old_addr[ETH_ALEN];
 111
 112         if (!is_valid_ether_addr(addr->sa_data))
 113                 return -EADDRNOTAVAIL;
 114
 115         ether_addr_copy(old_addr, dev->dev_addr);
 116         ether_addr_copy(dev->dev_addr, addr->sa_data);
 117
 118         /* only modify transtable if it has been initialized before */
 119         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 120                 batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS,
 121                                        "mac address changed", false);
 122                 batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS,
 123                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 130 {
 131         /* check ranges */
 132         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 133                 return -EINVAL;
 134
 135         dev->mtu = new_mtu;
 136
 137         return 0;
 138 }
 139
 140 /**
 141  * batadv_interface_set_rx_mode - set the rx mode of a device
 142  * @dev: registered network device to modify
 143  *
 144  * We do not actually need to set any rx filters for the virtual batman
 145  * soft interface. However a dummy handler enables a user to set static
 146  * multicast listeners for instance.
 147  */
 148 static void batadv_interface_set_rx_mode(struct net_device *dev)
 149 {
 150 }
 151
 152 static int batadv_interface_tx(struct sk_buff *skb,
 153                                struct net_device *soft_iface)
 154 {
 155         struct ethhdr *ethhdr;
 156         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 157         struct batadv_hard_iface *primary_if = NULL;
 158         struct batadv_bcast_packet *bcast_packet;
 159         __be16 ethertype = htons(ETH_P_BATMAN);
 160         static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 161                                                    0x00, 0x00};
 162         static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 163                                                     0x00, 0x00};
 164         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
 165         uint8_t *dst_hint = NULL, chaddr[ETH_ALEN];
 166         struct vlan_ethhdr *vhdr;
 167         unsigned int header_len = 0;
 168         int data_len = skb->len, ret;
 169         unsigned long brd_delay = 1;
 170         bool do_bcast = false, client_added;
 171         unsigned short vid;
 172         uint32_t seqno;
 173         int gw_mode;
 174         enum batadv_forw_mode forw_mode;
 175         struct batadv_orig_node *mcast_single_orig = NULL;
 176
 177         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 178                 goto dropped;
 179
 180         soft_iface->trans_start = jiffies;
 181         vid = batadv_get_vid(skb, 0);
 182         ethhdr = eth_hdr(skb);
 183
 184         switch (ntohs(ethhdr->h_proto)) {
 185         case ETH_P_8021Q:
 186                 vhdr = vlan_eth_hdr(skb);
 187
 188                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 189                         break;
 190
 191                 /* fall through */
 192         case ETH_P_BATMAN:
 193                 goto dropped;
 194         }
 195
 196         if (batadv_bla_tx(bat_priv, skb, vid))
 197                 goto dropped;
 198
 199         /* skb->data might have been reallocated by batadv_bla_tx() */
 200         ethhdr = eth_hdr(skb);
 201
 202         /* Register the client MAC in the transtable */
 203         if (!is_multicast_ether_addr(ethhdr->h_source)) {
 204                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 205                                                    vid, skb->skb_iif,
 206                                                    skb->mark);
 207                 if (!client_added)
 208                         goto dropped;
 209         }
 210
 211         /* don't accept stp packets. STP does not help in meshes.
 212          * better use the bridge loop avoidance ...
 213          *
 214          * The same goes for ECTP sent at least by some Cisco Switches,
 215          * it might confuse the mesh when used with bridge loop avoidance.
 216          */
 217         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 218                 goto dropped;
 219
 220         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 221                 goto dropped;
 222
 223         gw_mode = atomic_read(&bat_priv->gw_mode);
 224         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 225                 /* if gw mode is off, broadcast every packet */
 226                 if (gw_mode == BATADV_GW_MODE_OFF) {
 227                         do_bcast = true;
 228                         goto send;
 229                 }
 230
 231                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
 232                                                         chaddr);
 233                 /* skb->data may have been modified by
 234                  * batadv_gw_dhcp_recipient_get()
 235                  */
 236                 ethhdr = eth_hdr(skb);
 237                 /* if gw_mode is on, broadcast any non-DHCP message.
 238                  * All the DHCP packets are going to be sent as unicast
 239                  */
 240                 if (dhcp_rcp == BATADV_DHCP_NO) {
 241                         do_bcast = true;
 242                         goto send;
 243                 }
 244
 245                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
 246                         dst_hint = chaddr;
 247                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
 248                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
 249                         /* gateways should not forward any DHCP message if
 250                          * directed to a DHCP server
 251                          */
 252                         goto dropped;
 253
 254 send:
 255                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 256                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
 257                                                            &mcast_single_orig);
 258                         if (forw_mode == BATADV_FORW_NONE)
 259                                 goto dropped;
 260
 261                         if (forw_mode == BATADV_FORW_SINGLE)
 262                                 do_bcast = false;
 263                 }
 264         }
 265
 266         batadv_skb_set_priority(skb, 0);
 267
 268         /* ethernet packet should be broadcasted */
 269         if (do_bcast) {
 270                 primary_if = batadv_primary_if_get_selected(bat_priv);
 271                 if (!primary_if)
 272                         goto dropped;
 273
 274                 /* in case of ARP request, we do not immediately broadcasti the
 275                  * packet, instead we first wait for DAT to try to retrieve the
 276                  * correct ARP entry
 277                  */
 278                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 279                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 280
 281                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 282                         goto dropped;
 283
 284                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 285                 bcast_packet->version = BATADV_COMPAT_VERSION;
 286                 bcast_packet->ttl = BATADV_TTL;
 287
 288                 /* batman packet type: broadcast */
 289                 bcast_packet->packet_type = BATADV_BCAST;
 290                 bcast_packet->reserved = 0;
 291
 292                 /* hw address of first interface is the orig mac because only
 293                  * this mac is known throughout the mesh
 294                  */
 295                 ether_addr_copy(bcast_packet->orig,
 296                                 primary_if->net_dev->dev_addr);
 297
 298                 /* set broadcast sequence number */
 299                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 300                 bcast_packet->seqno = htonl(seqno);
 301
 302                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 303
 304                 /* a copy is stored in the bcast list, therefore removing
 305                  * the original skb.
 306                  */
 307                 kfree_skb(skb);
 308
 309         /* unicast packet */
 310         } else {
 311                 /* DHCP packets going to a server will use the GW feature */
 312                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
 313                         ret = batadv_gw_out_of_range(bat_priv, skb);
 314                         if (ret)
 315                                 goto dropped;
 316                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 317                 } else if (mcast_single_orig) {
 318                         ret = batadv_send_skb_unicast(bat_priv, skb,
 319                                                       BATADV_UNICAST, 0,
 320                                                       mcast_single_orig, vid);
 321                 } else {
 322                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 323                                                                   skb))
 324                                 goto dropped;
 325
 326                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 327
 328                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 329                                                      vid);
 330                 }
 331                 if (ret == NET_XMIT_DROP)
 332                         goto dropped_freed;
 333         }
 334
 335         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 336         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 337         goto end;
 338
 339 dropped:
 340         kfree_skb(skb);
 341 dropped_freed:
 342         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 343 end:
 344         if (primary_if)
 345                 batadv_hardif_free_ref(primary_if);
 346         return NETDEV_TX_OK;
 347 }
 348
 349 void batadv_interface_rx(struct net_device *soft_iface,
 350                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 351                          int hdr_size, struct batadv_orig_node *orig_node)
 352 {
 353         struct batadv_bcast_packet *batadv_bcast_packet;
 354         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 355         __be16 ethertype = htons(ETH_P_BATMAN);
 356         struct vlan_ethhdr *vhdr;
 357         struct ethhdr *ethhdr;
 358         unsigned short vid;
 359         bool is_bcast;
 360
 361         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 362         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
 363
 364         /* check if enough space is available for pulling, and pull */
 365         if (!pskb_may_pull(skb, hdr_size))
 366                 goto dropped;
 367
 368         skb_pull_rcsum(skb, hdr_size);
 369         skb_reset_mac_header(skb);
 370
 371         /* clean the netfilter state now that the batman-adv header has been
 372          * removed
 373          */
 374         nf_reset(skb);
 375
 376         vid = batadv_get_vid(skb, 0);
 377         ethhdr = eth_hdr(skb);
 378
 379         switch (ntohs(ethhdr->h_proto)) {
 380         case ETH_P_8021Q:
 381                 vhdr = (struct vlan_ethhdr *)skb->data;
 382
 383                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 384                         break;
 385
 386                 /* fall through */
 387         case ETH_P_BATMAN:
 388                 goto dropped;
 389         }
 390
 391         /* skb->dev & skb->pkt_type are set here */
 392         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 393                 goto dropped;
 394         skb->protocol = eth_type_trans(skb, soft_iface);
 395
 396         /* should not be necessary anymore as we use skb_pull_rcsum()
 397          * TODO: please verify this and remove this TODO
 398          * -- Dec 21st 2009, Simon Wunderlich
 399          */
 400
 401         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 402
 403         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 404         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 405                            skb->len + ETH_HLEN);
 406
 407         soft_iface->last_rx = jiffies;
 408
 409         /* Let the bridge loop avoidance check the packet. If will
 410          * not handle it, we can safely push it up.
 411          */
 412         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 413                 goto out;
 414
 415         if (orig_node)
 416                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 417                                                      ethhdr->h_source, vid);
 418
 419         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 420                 /* set the mark on broadcast packets if AP isolation is ON and
 421                  * the packet is coming from an "isolated" client
 422                  */
 423                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 424                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 425                                                  vid)) {
 426                         /* save bits in skb->mark not covered by the mask and
 427                          * apply the mark on the rest
 428                          */
 429                         skb->mark &= ~bat_priv->isolation_mark_mask;
 430                         skb->mark |= bat_priv->isolation_mark;
 431                 }
 432         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 433                                          ethhdr->h_dest, vid)) {
 434                 goto dropped;
 435         }
 436
 437         netif_rx(skb);
 438         goto out;
 439
 440 dropped:
 441         kfree_skb(skb);
 442 out:
 443         return;
 444 }
 445
 446 /**
 447  * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
 448  *  possibly free it
 449  * @softif_vlan: the vlan object to release
 450  */
 451 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
 452 {
 453         if (atomic_dec_and_test(&vlan->refcount)) {
 454                 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 455                 hlist_del_rcu(&vlan->list);
 456                 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 457
 458                 kfree_rcu(vlan, rcu);
 459         }
 460 }
 461
 462 /**
 463  * batadv_softif_vlan_get - get the vlan object for a specific vid
 464  * @bat_priv: the bat priv with all the soft interface information
 465  * @vid: the identifier of the vlan object to retrieve
 466  *
 467  * Returns the private data of the vlan matching the vid passed as argument or
 468  * NULL otherwise. The refcounter of the returned object is incremented by 1.
 469  */
 470 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 471                                                   unsigned short vid)
 472 {
 473         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 474
 475         rcu_read_lock();
 476         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 477                 if (vlan_tmp->vid != vid)
 478                         continue;
 479
 480                 if (!atomic_inc_not_zero(&vlan_tmp->refcount))
 481                         continue;
 482
 483                 vlan = vlan_tmp;
 484                 break;
 485         }
 486         rcu_read_unlock();
 487
 488         return vlan;
 489 }
 490
 491 /**
 492  * batadv_create_vlan - allocate the needed resources for a new vlan
 493  * @bat_priv: the bat priv with all the soft interface information
 494  * @vid: the VLAN identifier
 495  *
 496  * Returns 0 on success, a negative error otherwise.
 497  */
 498 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 499 {
 500         struct batadv_softif_vlan *vlan;
 501         int err;
 502
 503         vlan = batadv_softif_vlan_get(bat_priv, vid);
 504         if (vlan) {
 505                 batadv_softif_vlan_free_ref(vlan);
 506                 return -EEXIST;
 507         }
 508
 509         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 510         if (!vlan)
 511                 return -ENOMEM;
 512
 513         vlan->bat_priv = bat_priv;
 514         vlan->vid = vid;
 515         atomic_set(&vlan->refcount, 1);
 516
 517         atomic_set(&vlan->ap_isolation, 0);
 518
 519         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 520         if (err) {
 521                 kfree(vlan);
 522                 return err;
 523         }
 524
 525         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 526         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 527         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 528
 529         /* add a new TT local entry. This one will be marked with the NOPURGE
 530          * flag
 531          */
 532         batadv_tt_local_add(bat_priv->soft_iface,
 533                             bat_priv->soft_iface->dev_addr, vid,
 534                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 535
 536         return 0;
 537 }
 538
 539 /**
 540  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
 541  * @bat_priv: the bat priv with all the soft interface information
 542  * @vlan: the object to remove
 543  */
 544 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 545                                        struct batadv_softif_vlan *vlan)
 546 {
 547         /* explicitly remove the associated TT local entry because it is marked
 548          * with the NOPURGE flag
 549          */
 550         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 551                                vlan->vid, "vlan interface destroyed", false);
 552
 553         batadv_sysfs_del_vlan(bat_priv, vlan);
 554         batadv_softif_vlan_free_ref(vlan);
 555 }
 556
 557 /**
 558  * batadv_interface_add_vid - ndo_add_vid API implementation
 559  * @dev: the netdev of the mesh interface
 560  * @vid: identifier of the new vlan
 561  *
 562  * Set up all the internal structures for handling the new vlan on top of the
 563  * mesh interface
 564  *
 565  * Returns 0 on success or a negative error code in case of failure.
 566  */
 567 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 568                                     unsigned short vid)
 569 {
 570         struct batadv_priv *bat_priv = netdev_priv(dev);
 571         struct batadv_softif_vlan *vlan;
 572         int ret;
 573
 574         /* only 802.1Q vlans are supported.
 575          * batman-adv does not know how to handle other types
 576          */
 577         if (proto != htons(ETH_P_8021Q))
 578                 return -EINVAL;
 579
 580         vid |= BATADV_VLAN_HAS_TAG;
 581
 582         /* if a new vlan is getting created and it already exists, it means that
 583          * it was not deleted yet. batadv_softif_vlan_get() increases the
 584          * refcount in order to revive the object.
 585          *
 586          * if it does not exist then create it.
 587          */
 588         vlan = batadv_softif_vlan_get(bat_priv, vid);
 589         if (!vlan)
 590                 return batadv_softif_create_vlan(bat_priv, vid);
 591
 592         /* recreate the sysfs object if it was already destroyed (and it should
 593          * be since we received a kill_vid() for this vlan
 594          */
 595         if (!vlan->kobj) {
 596                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 597                 if (ret) {
 598                         batadv_softif_vlan_free_ref(vlan);
 599                         return ret;
 600                 }
 601         }
 602
 603         /* add a new TT local entry. This one will be marked with the NOPURGE
 604          * flag. This must be added again, even if the vlan object already
 605          * exists, because the entry was deleted by kill_vid()
 606          */
 607         batadv_tt_local_add(bat_priv->soft_iface,
 608                             bat_priv->soft_iface->dev_addr, vid,
 609                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 610
 611         return 0;
 612 }
 613
 614 /**
 615  * batadv_interface_kill_vid - ndo_kill_vid API implementation
 616  * @dev: the netdev of the mesh interface
 617  * @vid: identifier of the deleted vlan
 618  *
 619  * Destroy all the internal structures used to handle the vlan identified by vid
 620  * on top of the mesh interface
 621  *
 622  * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 623  * or -ENOENT if the specified vlan id wasn't registered.
 624  */
 625 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 626                                      unsigned short vid)
 627 {
 628         struct batadv_priv *bat_priv = netdev_priv(dev);
 629         struct batadv_softif_vlan *vlan;
 630
 631         /* only 802.1Q vlans are supported. batman-adv does not know how to
 632          * handle other types
 633          */
 634         if (proto != htons(ETH_P_8021Q))
 635                 return -EINVAL;
 636
 637         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 638         if (!vlan)
 639                 return -ENOENT;
 640
 641         batadv_softif_destroy_vlan(bat_priv, vlan);
 642
 643         /* finally free the vlan object */
 644         batadv_softif_vlan_free_ref(vlan);
 645
 646         return 0;
 647 }
 648
 649 /* batman-adv network devices have devices nesting below it and are a special
 650  * "super class" of normal network devices; split their locks off into a
 651  * separate class since they always nest.
 652  */
 653 static struct lock_class_key batadv_netdev_xmit_lock_key;
 654 static struct lock_class_key batadv_netdev_addr_lock_key;
 655
 656 /**
 657  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 658  * @dev: device which owns the tx queue
 659  * @txq: tx queue to modify
 660  * @_unused: always NULL
 661  */
 662 static void batadv_set_lockdep_class_one(struct net_device *dev,
 663                                          struct netdev_queue *txq,
 664                                          void *_unused)
 665 {
 666         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 667 }
 668
 669 /**
 670  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 671  * @dev: network device to modify
 672  */
 673 static void batadv_set_lockdep_class(struct net_device *dev)
 674 {
 675         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 676         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 677 }
 678
 679 /**
 680  * batadv_softif_destroy_finish - cleans up the remains of a softif
 681  * @work: work queue item
 682  *
 683  * Free the parts of the soft interface which can not be removed under
 684  * rtnl lock (to prevent deadlock situations).
 685  */
 686 static void batadv_softif_destroy_finish(struct work_struct *work)
 687 {
 688         struct batadv_softif_vlan *vlan;
 689         struct batadv_priv *bat_priv;
 690         struct net_device *soft_iface;
 691
 692         bat_priv = container_of(work, struct batadv_priv,
 693                                 cleanup_work);
 694         soft_iface = bat_priv->soft_iface;
 695
 696         /* destroy the "untagged" VLAN */
 697         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
 698         if (vlan) {
 699                 batadv_softif_destroy_vlan(bat_priv, vlan);
 700                 batadv_softif_vlan_free_ref(vlan);
 701         }
 702
 703         batadv_sysfs_del_meshif(soft_iface);
 704         unregister_netdev(soft_iface);
 705 }
 706
 707 /**
 708  * batadv_softif_init_late - late stage initialization of soft interface
 709  * @dev: registered network device to modify
 710  *
 711  * Returns error code on failures
 712  */
 713 static int batadv_softif_init_late(struct net_device *dev)
 714 {
 715         struct batadv_priv *bat_priv;
 716         uint32_t random_seqno;
 717         int ret;
 718         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 719
 720         batadv_set_lockdep_class(dev);
 721
 722         bat_priv = netdev_priv(dev);
 723         bat_priv->soft_iface = dev;
 724         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 725
 726         /* batadv_interface_stats() needs to be available as soon as
 727          * register_netdevice() has been called
 728          */
 729         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 730         if (!bat_priv->bat_counters)
 731                 return -ENOMEM;
 732
 733         atomic_set(&bat_priv->aggregated_ogms, 1);
 734         atomic_set(&bat_priv->bonding, 0);
 735 #ifdef CONFIG_BATMAN_ADV_BLA
 736         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 737 #endif
 738 #ifdef CONFIG_BATMAN_ADV_DAT
 739         atomic_set(&bat_priv->distributed_arp_table, 1);
 740 #endif
 741 #ifdef CONFIG_BATMAN_ADV_MCAST
 742         bat_priv->mcast.flags = BATADV_NO_FLAGS;
 743         atomic_set(&bat_priv->multicast_mode, 1);
 744         atomic_set(&bat_priv->mcast.num_disabled, 0);
 745         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 746         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 747         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 748 #endif
 749         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 750         atomic_set(&bat_priv->gw_sel_class, 20);
 751         atomic_set(&bat_priv->gw.bandwidth_down, 100);
 752         atomic_set(&bat_priv->gw.bandwidth_up, 20);
 753         atomic_set(&bat_priv->orig_interval, 1000);
 754         atomic_set(&bat_priv->hop_penalty, 15);
 755 #ifdef CONFIG_BATMAN_ADV_DEBUG
 756         atomic_set(&bat_priv->log_level, 0);
 757 #endif
 758         atomic_set(&bat_priv->fragmentation, 1);
 759         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 760         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 761         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 762
 763         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 764         atomic_set(&bat_priv->bcast_seqno, 1);
 765         atomic_set(&bat_priv->tt.vn, 0);
 766         atomic_set(&bat_priv->tt.local_changes, 0);
 767         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 768 #ifdef CONFIG_BATMAN_ADV_BLA
 769         atomic_set(&bat_priv->bla.num_requests, 0);
 770 #endif
 771         bat_priv->tt.last_changeset = NULL;
 772         bat_priv->tt.last_changeset_len = 0;
 773         bat_priv->isolation_mark = 0;
 774         bat_priv->isolation_mark_mask = 0;
 775
 776         /* randomize initial seqno to avoid collision */
 777         get_random_bytes(&random_seqno, sizeof(random_seqno));
 778         atomic_set(&bat_priv->frag_seqno, random_seqno);
 779
 780         bat_priv->primary_if = NULL;
 781         bat_priv->num_ifaces = 0;
 782
 783         batadv_nc_init_bat_priv(bat_priv);
 784
 785         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 786         if (ret < 0)
 787                 goto free_bat_counters;
 788
 789         ret = batadv_debugfs_add_meshif(dev);
 790         if (ret < 0)
 791                 goto free_bat_counters;
 792
 793         ret = batadv_mesh_init(dev);
 794         if (ret < 0)
 795                 goto unreg_debugfs;
 796
 797         return 0;
 798
 799 unreg_debugfs:
 800         batadv_debugfs_del_meshif(dev);
 801 free_bat_counters:
 802         free_percpu(bat_priv->bat_counters);
 803         bat_priv->bat_counters = NULL;
 804
 805         return ret;
 806 }
 807
 808 /**
 809  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
 810  * @dev: batadv_soft_interface used as master interface
 811  * @slave_dev: net_device which should become the slave interface
 812  *
 813  * Return 0 if successful or error otherwise.
 814  */
 815 static int batadv_softif_slave_add(struct net_device *dev,
 816                                    struct net_device *slave_dev)
 817 {
 818         struct batadv_hard_iface *hard_iface;
 819         int ret = -EINVAL;
 820
 821         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 822         if (!hard_iface || hard_iface->soft_iface != NULL)
 823                 goto out;
 824
 825         ret = batadv_hardif_enable_interface(hard_iface, dev->name);
 826
 827 out:
 828         if (hard_iface)
 829                 batadv_hardif_free_ref(hard_iface);
 830         return ret;
 831 }
 832
 833 /**
 834  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
 835  * @dev: batadv_soft_interface used as master interface
 836  * @slave_dev: net_device which should be removed from the master interface
 837  *
 838  * Return 0 if successful or error otherwise.
 839  */
 840 static int batadv_softif_slave_del(struct net_device *dev,
 841                                    struct net_device *slave_dev)
 842 {
 843         struct batadv_hard_iface *hard_iface;
 844         int ret = -EINVAL;
 845
 846         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 847
 848         if (!hard_iface || hard_iface->soft_iface != dev)
 849                 goto out;
 850
 851         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 852         ret = 0;
 853
 854 out:
 855         if (hard_iface)
 856                 batadv_hardif_free_ref(hard_iface);
 857         return ret;
 858 }
 859
 860 static const struct net_device_ops batadv_netdev_ops = {
 861         .ndo_init = batadv_softif_init_late,
 862         .ndo_open = batadv_interface_open,
 863         .ndo_stop = batadv_interface_release,
 864         .ndo_get_stats = batadv_interface_stats,
 865         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 866         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 867         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 868         .ndo_change_mtu = batadv_interface_change_mtu,
 869         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 870         .ndo_start_xmit = batadv_interface_tx,
 871         .ndo_validate_addr = eth_validate_addr,
 872         .ndo_add_slave = batadv_softif_slave_add,
 873         .ndo_del_slave = batadv_softif_slave_del,
 874 };
 875
 876 /**
 877  * batadv_softif_free - Deconstructor of batadv_soft_interface
 878  * @dev: Device to cleanup and remove
 879  */
 880 static void batadv_softif_free(struct net_device *dev)
 881 {
 882         batadv_debugfs_del_meshif(dev);
 883         batadv_mesh_free(dev);
 884
 885         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
 886          * their tasks. Wait for them all to be finished before freeing the
 887          * netdev and its private data (bat_priv)
 888          */
 889         rcu_barrier();
 890
 891         free_netdev(dev);
 892 }
 893
 894 /**
 895  * batadv_softif_init_early - early stage initialization of soft interface
 896  * @dev: registered network device to modify
 897  */
 898 static void batadv_softif_init_early(struct net_device *dev)
 899 {
 900         struct batadv_priv *priv = netdev_priv(dev);
 901
 902         ether_setup(dev);
 903
 904         dev->netdev_ops = &batadv_netdev_ops;
 905         dev->destructor = batadv_softif_free;
 906         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 907         dev->tx_queue_len = 0;
 908
 909         /* can't call min_mtu, because the needed variables
 910          * have not been initialized yet
 911          */
 912         dev->mtu = ETH_DATA_LEN;
 913         /* reserve more space in the skbuff for our header */
 914         dev->hard_header_len = batadv_max_header_len();
 915
 916         /* generate random address */
 917         eth_hw_addr_random(dev);
 918
 919         dev->ethtool_ops = &batadv_ethtool_ops;
 920
 921         memset(priv, 0, sizeof(*priv));
 922 }
 923
 924 struct net_device *batadv_softif_create(const char *name)
 925 {
 926         struct net_device *soft_iface;
 927         int ret;
 928
 929         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
 930                                   batadv_softif_init_early);
 931         if (!soft_iface)
 932                 return NULL;
 933
 934         soft_iface->rtnl_link_ops = &batadv_link_ops;
 935
 936         ret = register_netdevice(soft_iface);
 937         if (ret < 0) {
 938                 pr_err("Unable to register the batman interface '%s': %i\n",
 939                        name, ret);
 940                 free_netdev(soft_iface);
 941                 return NULL;
 942         }
 943
 944         return soft_iface;
 945 }
 946
 947 /**
 948  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
 949  * @soft_iface: the to-be-removed batman-adv interface
 950  */
 951 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 952 {
 953         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 954
 955         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 956 }
 957
 958 /**
 959  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
 960  * @soft_iface: the to-be-removed batman-adv interface
 961  * @head: list pointer
 962  */
 963 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 964                                           struct list_head *head)
 965 {
 966         struct batadv_hard_iface *hard_iface;
 967
 968         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 969                 if (hard_iface->soft_iface == soft_iface)
 970                         batadv_hardif_disable_interface(hard_iface,
 971                                                         BATADV_IF_CLEANUP_KEEP);
 972         }
 973
 974         batadv_sysfs_del_meshif(soft_iface);
 975         unregister_netdevice_queue(soft_iface, head);
 976 }
 977
 978 int batadv_softif_is_valid(const struct net_device *net_dev)
 979 {
 980         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 981                 return 1;
 982
 983         return 0;
 984 }
 985
 986 struct rtnl_link_ops batadv_link_ops __read_mostly = {
 987         .kind           = "batadv",
 988         .priv_size      = sizeof(struct batadv_priv),
 989         .setup          = batadv_softif_init_early,
 990         .dellink        = batadv_softif_destroy_netlink,
 991 };
 992
 993 /* ethtool */
 994 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 995 {
 996         cmd->supported = 0;
 997         cmd->advertising = 0;
 998         ethtool_cmd_speed_set(cmd, SPEED_10);
 999         cmd->duplex = DUPLEX_FULL;
1000         cmd->port = PORT_TP;
1001         cmd->phy_address = 0;
1002         cmd->transceiver = XCVR_INTERNAL;
1003         cmd->autoneg = AUTONEG_DISABLE;
1004         cmd->maxtxpkt = 0;
1005         cmd->maxrxpkt = 0;
1006
1007         return 0;
1008 }
1009
1010 static void batadv_get_drvinfo(struct net_device *dev,
1011                                struct ethtool_drvinfo *info)
1012 {
1013         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1014         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1015         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1016         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1017 }
1018
1019 static u32 batadv_get_msglevel(struct net_device *dev)
1020 {
1021         return -EOPNOTSUPP;
1022 }
1023
1024 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1025 {
1026 }
1027
1028 static u32 batadv_get_link(struct net_device *dev)
1029 {
1030         return 1;
1031 }
1032
1033 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1034  * Declare each description string in struct.name[] to get fixed sized buffer
1035  * and compile time checking for strings longer than ETH_GSTRING_LEN.
1036  */
1037 static const struct {
1038         const char name[ETH_GSTRING_LEN];
1039 } batadv_counters_strings[] = {
1040         { "tx" },
1041         { "tx_bytes" },
1042         { "tx_dropped" },
1043         { "rx" },
1044         { "rx_bytes" },
1045         { "forward" },
1046         { "forward_bytes" },
1047         { "mgmt_tx" },
1048         { "mgmt_tx_bytes" },
1049         { "mgmt_rx" },
1050         { "mgmt_rx_bytes" },
1051         { "frag_tx" },
1052         { "frag_tx_bytes" },
1053         { "frag_rx" },
1054         { "frag_rx_bytes" },
1055         { "frag_fwd" },
1056         { "frag_fwd_bytes" },
1057         { "tt_request_tx" },
1058         { "tt_request_rx" },
1059         { "tt_response_tx" },
1060         { "tt_response_rx" },
1061         { "tt_roam_adv_tx" },
1062         { "tt_roam_adv_rx" },
1063 #ifdef CONFIG_BATMAN_ADV_DAT
1064         { "dat_get_tx" },
1065         { "dat_get_rx" },
1066         { "dat_put_tx" },
1067         { "dat_put_rx" },
1068         { "dat_cached_reply_tx" },
1069 #endif
1070 #ifdef CONFIG_BATMAN_ADV_NC
1071         { "nc_code" },
1072         { "nc_code_bytes" },
1073         { "nc_recode" },
1074         { "nc_recode_bytes" },
1075         { "nc_buffer" },
1076         { "nc_decode" },
1077         { "nc_decode_bytes" },
1078         { "nc_decode_failed" },
1079         { "nc_sniffed" },
1080 #endif
1081 };
1082
1083 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
1084                                uint8_t *data)
1085 {
1086         if (stringset == ETH_SS_STATS)
1087                 memcpy(data, batadv_counters_strings,
1088                        sizeof(batadv_counters_strings));
1089 }
1090
1091 static void batadv_get_ethtool_stats(struct net_device *dev,
1092                                      struct ethtool_stats *stats,
1093                                      uint64_t *data)
1094 {
1095         struct batadv_priv *bat_priv = netdev_priv(dev);
1096         int i;
1097
1098         for (i = 0; i < BATADV_CNT_NUM; i++)
1099                 data[i] = batadv_sum_counter(bat_priv, i);
1100 }
1101
1102 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1103 {
1104         if (stringset == ETH_SS_STATS)
1105                 return BATADV_CNT_NUM;
1106
1107         return -EOPNOTSUPP;
1108 }