net/batman-adv/soft-interface.c

   1 /* Copyright (C) 2007-2015 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 "soft-interface.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/byteorder/generic.h>
  23 #include <linux/cache.h>
  24 #include <linux/compiler.h>
  25 #include <linux/errno.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/fs.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/if_vlan.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/kernel.h>
  33 #include <linux/list.h>
  34 #include <linux/lockdep.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/percpu.h>
  37 #include <linux/printk.h>
  38 #include <linux/random.h>
  39 #include <linux/rculist.h>
  40 #include <linux/rcupdate.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/slab.h>
  43 #include <linux/socket.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/stddef.h>
  46 #include <linux/string.h>
  47 #include <linux/types.h>
  48 #include <linux/workqueue.h>
  49
  50 #include "bridge_loop_avoidance.h"
  51 #include "debugfs.h"
  52 #include "distributed-arp-table.h"
  53 #include "gateway_client.h"
  54 #include "gateway_common.h"
  55 #include "hard-interface.h"
  56 #include "multicast.h"
  57 #include "network-coding.h"
  58 #include "packet.h"
  59 #include "send.h"
  60 #include "sysfs.h"
  61 #include "translation-table.h"
  62
  63 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  64 static void batadv_get_drvinfo(struct net_device *dev,
  65                                struct ethtool_drvinfo *info);
  66 static u32 batadv_get_msglevel(struct net_device *dev);
  67 static void batadv_set_msglevel(struct net_device *dev, u32 value);
  68 static u32 batadv_get_link(struct net_device *dev);
  69 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  70 static void batadv_get_ethtool_stats(struct net_device *dev,
  71                                      struct ethtool_stats *stats, u64 *data);
  72 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  73
  74 static const struct ethtool_ops batadv_ethtool_ops = {
  75         .get_settings = batadv_get_settings,
  76         .get_drvinfo = batadv_get_drvinfo,
  77         .get_msglevel = batadv_get_msglevel,
  78         .set_msglevel = batadv_set_msglevel,
  79         .get_link = batadv_get_link,
  80         .get_strings = batadv_get_strings,
  81         .get_ethtool_stats = batadv_get_ethtool_stats,
  82         .get_sset_count = batadv_get_sset_count,
  83 };
  84
  85 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  86 {
  87         int result;
  88
  89         /* TODO: We must check if we can release all references to non-payload
  90          * data using skb_header_release in our skbs to allow skb_cow_header to
  91          * work optimally. This means that those skbs are not allowed to read
  92          * or write any data which is before the current position of skb->data
  93          * after that call and thus allow other skbs with the same data buffer
  94          * to write freely in that area.
  95          */
  96         result = skb_cow_head(skb, len);
  97         if (result < 0)
  98                 return result;
  99
 100         skb_push(skb, len);
 101         return 0;
 102 }
 103
 104 static int batadv_interface_open(struct net_device *dev)
 105 {
 106         netif_start_queue(dev);
 107         return 0;
 108 }
 109
 110 static int batadv_interface_release(struct net_device *dev)
 111 {
 112         netif_stop_queue(dev);
 113         return 0;
 114 }
 115
 116 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
 117 {
 118         struct batadv_priv *bat_priv = netdev_priv(dev);
 119         struct net_device_stats *stats = &bat_priv->stats;
 120
 121         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 122         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 123         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 124         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 125         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 126         return stats;
 127 }
 128
 129 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 130 {
 131         struct batadv_priv *bat_priv = netdev_priv(dev);
 132         struct sockaddr *addr = p;
 133         uint8_t old_addr[ETH_ALEN];
 134
 135         if (!is_valid_ether_addr(addr->sa_data))
 136                 return -EADDRNOTAVAIL;
 137
 138         ether_addr_copy(old_addr, dev->dev_addr);
 139         ether_addr_copy(dev->dev_addr, addr->sa_data);
 140
 141         /* only modify transtable if it has been initialized before */
 142         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 143                 batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS,
 144                                        "mac address changed", false);
 145                 batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS,
 146                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 153 {
 154         /* check ranges */
 155         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * batadv_interface_set_rx_mode - set the rx mode of a device
 165  * @dev: registered network device to modify
 166  *
 167  * We do not actually need to set any rx filters for the virtual batman
 168  * soft interface. However a dummy handler enables a user to set static
 169  * multicast listeners for instance.
 170  */
 171 static void batadv_interface_set_rx_mode(struct net_device *dev)
 172 {
 173 }
 174
 175 static int batadv_interface_tx(struct sk_buff *skb,
 176                                struct net_device *soft_iface)
 177 {
 178         struct ethhdr *ethhdr;
 179         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 180         struct batadv_hard_iface *primary_if = NULL;
 181         struct batadv_bcast_packet *bcast_packet;
 182         __be16 ethertype = htons(ETH_P_BATMAN);
 183         static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 184                                                    0x00, 0x00};
 185         static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 186                                                     0x00, 0x00};
 187         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
 188         uint8_t *dst_hint = NULL, chaddr[ETH_ALEN];
 189         struct vlan_ethhdr *vhdr;
 190         unsigned int header_len = 0;
 191         int data_len = skb->len, ret;
 192         unsigned long brd_delay = 1;
 193         bool do_bcast = false, client_added;
 194         unsigned short vid;
 195         uint32_t seqno;
 196         int gw_mode;
 197         enum batadv_forw_mode forw_mode;
 198         struct batadv_orig_node *mcast_single_orig = NULL;
 199
 200         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 201                 goto dropped;
 202
 203         soft_iface->trans_start = jiffies;
 204         vid = batadv_get_vid(skb, 0);
 205         ethhdr = eth_hdr(skb);
 206
 207         switch (ntohs(ethhdr->h_proto)) {
 208         case ETH_P_8021Q:
 209                 vhdr = vlan_eth_hdr(skb);
 210
 211                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 212                         break;
 213
 214                 /* fall through */
 215         case ETH_P_BATMAN:
 216                 goto dropped;
 217         }
 218
 219         if (batadv_bla_tx(bat_priv, skb, vid))
 220                 goto dropped;
 221
 222         /* skb->data might have been reallocated by batadv_bla_tx() */
 223         ethhdr = eth_hdr(skb);
 224
 225         /* Register the client MAC in the transtable */
 226         if (!is_multicast_ether_addr(ethhdr->h_source)) {
 227                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 228                                                    vid, skb->skb_iif,
 229                                                    skb->mark);
 230                 if (!client_added)
 231                         goto dropped;
 232         }
 233
 234         /* don't accept stp packets. STP does not help in meshes.
 235          * better use the bridge loop avoidance ...
 236          *
 237          * The same goes for ECTP sent at least by some Cisco Switches,
 238          * it might confuse the mesh when used with bridge loop avoidance.
 239          */
 240         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 241                 goto dropped;
 242
 243         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 244                 goto dropped;
 245
 246         gw_mode = atomic_read(&bat_priv->gw_mode);
 247         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 248                 /* if gw mode is off, broadcast every packet */
 249                 if (gw_mode == BATADV_GW_MODE_OFF) {
 250                         do_bcast = true;
 251                         goto send;
 252                 }
 253
 254                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
 255                                                         chaddr);
 256                 /* skb->data may have been modified by
 257                  * batadv_gw_dhcp_recipient_get()
 258                  */
 259                 ethhdr = eth_hdr(skb);
 260                 /* if gw_mode is on, broadcast any non-DHCP message.
 261                  * All the DHCP packets are going to be sent as unicast
 262                  */
 263                 if (dhcp_rcp == BATADV_DHCP_NO) {
 264                         do_bcast = true;
 265                         goto send;
 266                 }
 267
 268                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
 269                         dst_hint = chaddr;
 270                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
 271                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
 272                         /* gateways should not forward any DHCP message if
 273                          * directed to a DHCP server
 274                          */
 275                         goto dropped;
 276
 277 send:
 278                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 279                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
 280                                                            &mcast_single_orig);
 281                         if (forw_mode == BATADV_FORW_NONE)
 282                                 goto dropped;
 283
 284                         if (forw_mode == BATADV_FORW_SINGLE)
 285                                 do_bcast = false;
 286                 }
 287         }
 288
 289         batadv_skb_set_priority(skb, 0);
 290
 291         /* ethernet packet should be broadcasted */
 292         if (do_bcast) {
 293                 primary_if = batadv_primary_if_get_selected(bat_priv);
 294                 if (!primary_if)
 295                         goto dropped;
 296
 297                 /* in case of ARP request, we do not immediately broadcasti the
 298                  * packet, instead we first wait for DAT to try to retrieve the
 299                  * correct ARP entry
 300                  */
 301                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 302                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 303
 304                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 305                         goto dropped;
 306
 307                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 308                 bcast_packet->version = BATADV_COMPAT_VERSION;
 309                 bcast_packet->ttl = BATADV_TTL;
 310
 311                 /* batman packet type: broadcast */
 312                 bcast_packet->packet_type = BATADV_BCAST;
 313                 bcast_packet->reserved = 0;
 314
 315                 /* hw address of first interface is the orig mac because only
 316                  * this mac is known throughout the mesh
 317                  */
 318                 ether_addr_copy(bcast_packet->orig,
 319                                 primary_if->net_dev->dev_addr);
 320
 321                 /* set broadcast sequence number */
 322                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 323                 bcast_packet->seqno = htonl(seqno);
 324
 325                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
 326
 327                 /* a copy is stored in the bcast list, therefore removing
 328                  * the original skb.
 329                  */
 330                 kfree_skb(skb);
 331
 332         /* unicast packet */
 333         } else {
 334                 /* DHCP packets going to a server will use the GW feature */
 335                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
 336                         ret = batadv_gw_out_of_range(bat_priv, skb);
 337                         if (ret)
 338                                 goto dropped;
 339                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 340                 } else if (mcast_single_orig) {
 341                         ret = batadv_send_skb_unicast(bat_priv, skb,
 342                                                       BATADV_UNICAST, 0,
 343                                                       mcast_single_orig, vid);
 344                 } else {
 345                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 346                                                                   skb))
 347                                 goto dropped;
 348
 349                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 350
 351                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 352                                                      vid);
 353                 }
 354                 if (ret == NET_XMIT_DROP)
 355                         goto dropped_freed;
 356         }
 357
 358         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 359         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 360         goto end;
 361
 362 dropped:
 363         kfree_skb(skb);
 364 dropped_freed:
 365         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 366 end:
 367         if (primary_if)
 368                 batadv_hardif_free_ref(primary_if);
 369         return NETDEV_TX_OK;
 370 }
 371
 372 void batadv_interface_rx(struct net_device *soft_iface,
 373                          struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 374                          int hdr_size, struct batadv_orig_node *orig_node)
 375 {
 376         struct batadv_bcast_packet *batadv_bcast_packet;
 377         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 378         __be16 ethertype = htons(ETH_P_BATMAN);
 379         struct vlan_ethhdr *vhdr;
 380         struct ethhdr *ethhdr;
 381         unsigned short vid;
 382         bool is_bcast;
 383
 384         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 385         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
 386
 387         /* check if enough space is available for pulling, and pull */
 388         if (!pskb_may_pull(skb, hdr_size))
 389                 goto dropped;
 390
 391         skb_pull_rcsum(skb, hdr_size);
 392         skb_reset_mac_header(skb);
 393
 394         /* clean the netfilter state now that the batman-adv header has been
 395          * removed
 396          */
 397         nf_reset(skb);
 398
 399         vid = batadv_get_vid(skb, 0);
 400         ethhdr = eth_hdr(skb);
 401
 402         switch (ntohs(ethhdr->h_proto)) {
 403         case ETH_P_8021Q:
 404                 vhdr = (struct vlan_ethhdr *)skb->data;
 405
 406                 if (vhdr->h_vlan_encapsulated_proto != ethertype)
 407                         break;
 408
 409                 /* fall through */
 410         case ETH_P_BATMAN:
 411                 goto dropped;
 412         }
 413
 414         /* skb->dev & skb->pkt_type are set here */
 415         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 416                 goto dropped;
 417         skb->protocol = eth_type_trans(skb, soft_iface);
 418
 419         /* should not be necessary anymore as we use skb_pull_rcsum()
 420          * TODO: please verify this and remove this TODO
 421          * -- Dec 21st 2009, Simon Wunderlich
 422          */
 423
 424         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 425
 426         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 427         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 428                            skb->len + ETH_HLEN);
 429
 430         soft_iface->last_rx = jiffies;
 431
 432         /* Let the bridge loop avoidance check the packet. If will
 433          * not handle it, we can safely push it up.
 434          */
 435         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 436                 goto out;
 437
 438         if (orig_node)
 439                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 440                                                      ethhdr->h_source, vid);
 441
 442         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 443                 /* set the mark on broadcast packets if AP isolation is ON and
 444                  * the packet is coming from an "isolated" client
 445                  */
 446                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 447                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 448                                                  vid)) {
 449                         /* save bits in skb->mark not covered by the mask and
 450                          * apply the mark on the rest
 451                          */
 452                         skb->mark &= ~bat_priv->isolation_mark_mask;
 453                         skb->mark |= bat_priv->isolation_mark;
 454                 }
 455         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 456                                          ethhdr->h_dest, vid)) {
 457                 goto dropped;
 458         }
 459
 460         netif_rx(skb);
 461         goto out;
 462
 463 dropped:
 464         kfree_skb(skb);
 465 out:
 466         return;
 467 }
 468
 469 /**
 470  * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
 471  *  possibly free it
 472  * @softif_vlan: the vlan object to release
 473  */
 474 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
 475 {
 476         if (atomic_dec_and_test(&vlan->refcount)) {
 477                 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 478                 hlist_del_rcu(&vlan->list);
 479                 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 480
 481                 kfree_rcu(vlan, rcu);
 482         }
 483 }
 484
 485 /**
 486  * batadv_softif_vlan_get - get the vlan object for a specific vid
 487  * @bat_priv: the bat priv with all the soft interface information
 488  * @vid: the identifier of the vlan object to retrieve
 489  *
 490  * Returns the private data of the vlan matching the vid passed as argument or
 491  * NULL otherwise. The refcounter of the returned object is incremented by 1.
 492  */
 493 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 494                                                   unsigned short vid)
 495 {
 496         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 497
 498         rcu_read_lock();
 499         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 500                 if (vlan_tmp->vid != vid)
 501                         continue;
 502
 503                 if (!atomic_inc_not_zero(&vlan_tmp->refcount))
 504                         continue;
 505
 506                 vlan = vlan_tmp;
 507                 break;
 508         }
 509         rcu_read_unlock();
 510
 511         return vlan;
 512 }
 513
 514 /**
 515  * batadv_create_vlan - allocate the needed resources for a new vlan
 516  * @bat_priv: the bat priv with all the soft interface information
 517  * @vid: the VLAN identifier
 518  *
 519  * Returns 0 on success, a negative error otherwise.
 520  */
 521 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 522 {
 523         struct batadv_softif_vlan *vlan;
 524         int err;
 525
 526         vlan = batadv_softif_vlan_get(bat_priv, vid);
 527         if (vlan) {
 528                 batadv_softif_vlan_free_ref(vlan);
 529                 return -EEXIST;
 530         }
 531
 532         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 533         if (!vlan)
 534                 return -ENOMEM;
 535
 536         vlan->bat_priv = bat_priv;
 537         vlan->vid = vid;
 538         atomic_set(&vlan->refcount, 1);
 539
 540         atomic_set(&vlan->ap_isolation, 0);
 541
 542         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 543         if (err) {
 544                 kfree(vlan);
 545                 return err;
 546         }
 547
 548         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 549         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 550         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 551
 552         /* add a new TT local entry. This one will be marked with the NOPURGE
 553          * flag
 554          */
 555         batadv_tt_local_add(bat_priv->soft_iface,
 556                             bat_priv->soft_iface->dev_addr, vid,
 557                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 558
 559         return 0;
 560 }
 561
 562 /**
 563  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
 564  * @bat_priv: the bat priv with all the soft interface information
 565  * @vlan: the object to remove
 566  */
 567 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 568                                        struct batadv_softif_vlan *vlan)
 569 {
 570         /* explicitly remove the associated TT local entry because it is marked
 571          * with the NOPURGE flag
 572          */
 573         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 574                                vlan->vid, "vlan interface destroyed", false);
 575
 576         batadv_sysfs_del_vlan(bat_priv, vlan);
 577         batadv_softif_vlan_free_ref(vlan);
 578 }
 579
 580 /**
 581  * batadv_interface_add_vid - ndo_add_vid API implementation
 582  * @dev: the netdev of the mesh interface
 583  * @vid: identifier of the new vlan
 584  *
 585  * Set up all the internal structures for handling the new vlan on top of the
 586  * mesh interface
 587  *
 588  * Returns 0 on success or a negative error code in case of failure.
 589  */
 590 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 591                                     unsigned short vid)
 592 {
 593         struct batadv_priv *bat_priv = netdev_priv(dev);
 594         struct batadv_softif_vlan *vlan;
 595         int ret;
 596
 597         /* only 802.1Q vlans are supported.
 598          * batman-adv does not know how to handle other types
 599          */
 600         if (proto != htons(ETH_P_8021Q))
 601                 return -EINVAL;
 602
 603         vid |= BATADV_VLAN_HAS_TAG;
 604
 605         /* if a new vlan is getting created and it already exists, it means that
 606          * it was not deleted yet. batadv_softif_vlan_get() increases the
 607          * refcount in order to revive the object.
 608          *
 609          * if it does not exist then create it.
 610          */
 611         vlan = batadv_softif_vlan_get(bat_priv, vid);
 612         if (!vlan)
 613                 return batadv_softif_create_vlan(bat_priv, vid);
 614
 615         /* recreate the sysfs object if it was already destroyed (and it should
 616          * be since we received a kill_vid() for this vlan
 617          */
 618         if (!vlan->kobj) {
 619                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 620                 if (ret) {
 621                         batadv_softif_vlan_free_ref(vlan);
 622                         return ret;
 623                 }
 624         }
 625
 626         /* add a new TT local entry. This one will be marked with the NOPURGE
 627          * flag. This must be added again, even if the vlan object already
 628          * exists, because the entry was deleted by kill_vid()
 629          */
 630         batadv_tt_local_add(bat_priv->soft_iface,
 631                             bat_priv->soft_iface->dev_addr, vid,
 632                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 633
 634         return 0;
 635 }
 636
 637 /**
 638  * batadv_interface_kill_vid - ndo_kill_vid API implementation
 639  * @dev: the netdev of the mesh interface
 640  * @vid: identifier of the deleted vlan
 641  *
 642  * Destroy all the internal structures used to handle the vlan identified by vid
 643  * on top of the mesh interface
 644  *
 645  * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 646  * or -ENOENT if the specified vlan id wasn't registered.
 647  */
 648 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 649                                      unsigned short vid)
 650 {
 651         struct batadv_priv *bat_priv = netdev_priv(dev);
 652         struct batadv_softif_vlan *vlan;
 653
 654         /* only 802.1Q vlans are supported. batman-adv does not know how to
 655          * handle other types
 656          */
 657         if (proto != htons(ETH_P_8021Q))
 658                 return -EINVAL;
 659
 660         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 661         if (!vlan)
 662                 return -ENOENT;
 663
 664         batadv_softif_destroy_vlan(bat_priv, vlan);
 665
 666         /* finally free the vlan object */
 667         batadv_softif_vlan_free_ref(vlan);
 668
 669         return 0;
 670 }
 671
 672 /* batman-adv network devices have devices nesting below it and are a special
 673  * "super class" of normal network devices; split their locks off into a
 674  * separate class since they always nest.
 675  */
 676 static struct lock_class_key batadv_netdev_xmit_lock_key;
 677 static struct lock_class_key batadv_netdev_addr_lock_key;
 678
 679 /**
 680  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
 681  * @dev: device which owns the tx queue
 682  * @txq: tx queue to modify
 683  * @_unused: always NULL
 684  */
 685 static void batadv_set_lockdep_class_one(struct net_device *dev,
 686                                          struct netdev_queue *txq,
 687                                          void *_unused)
 688 {
 689         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 690 }
 691
 692 /**
 693  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
 694  * @dev: network device to modify
 695  */
 696 static void batadv_set_lockdep_class(struct net_device *dev)
 697 {
 698         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 699         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 700 }
 701
 702 /**
 703  * batadv_softif_destroy_finish - cleans up the remains of a softif
 704  * @work: work queue item
 705  *
 706  * Free the parts of the soft interface which can not be removed under
 707  * rtnl lock (to prevent deadlock situations).
 708  */
 709 static void batadv_softif_destroy_finish(struct work_struct *work)
 710 {
 711         struct batadv_softif_vlan *vlan;
 712         struct batadv_priv *bat_priv;
 713         struct net_device *soft_iface;
 714
 715         bat_priv = container_of(work, struct batadv_priv,
 716                                 cleanup_work);
 717         soft_iface = bat_priv->soft_iface;
 718
 719         /* destroy the "untagged" VLAN */
 720         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
 721         if (vlan) {
 722                 batadv_softif_destroy_vlan(bat_priv, vlan);
 723                 batadv_softif_vlan_free_ref(vlan);
 724         }
 725
 726         batadv_sysfs_del_meshif(soft_iface);
 727         unregister_netdev(soft_iface);
 728 }
 729
 730 /**
 731  * batadv_softif_init_late - late stage initialization of soft interface
 732  * @dev: registered network device to modify
 733  *
 734  * Returns error code on failures
 735  */
 736 static int batadv_softif_init_late(struct net_device *dev)
 737 {
 738         struct batadv_priv *bat_priv;
 739         uint32_t random_seqno;
 740         int ret;
 741         size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 742
 743         batadv_set_lockdep_class(dev);
 744
 745         bat_priv = netdev_priv(dev);
 746         bat_priv->soft_iface = dev;
 747         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 748
 749         /* batadv_interface_stats() needs to be available as soon as
 750          * register_netdevice() has been called
 751          */
 752         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 753         if (!bat_priv->bat_counters)
 754                 return -ENOMEM;
 755
 756         atomic_set(&bat_priv->aggregated_ogms, 1);
 757         atomic_set(&bat_priv->bonding, 0);
 758 #ifdef CONFIG_BATMAN_ADV_BLA
 759         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
 760 #endif
 761 #ifdef CONFIG_BATMAN_ADV_DAT
 762         atomic_set(&bat_priv->distributed_arp_table, 1);
 763 #endif
 764 #ifdef CONFIG_BATMAN_ADV_MCAST
 765         bat_priv->mcast.flags = BATADV_NO_FLAGS;
 766         atomic_set(&bat_priv->multicast_mode, 1);
 767         atomic_set(&bat_priv->mcast.num_disabled, 0);
 768         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 769         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 770         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 771 #endif
 772         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 773         atomic_set(&bat_priv->gw_sel_class, 20);
 774         atomic_set(&bat_priv->gw.bandwidth_down, 100);
 775         atomic_set(&bat_priv->gw.bandwidth_up, 20);
 776         atomic_set(&bat_priv->orig_interval, 1000);
 777         atomic_set(&bat_priv->hop_penalty, 30);
 778 #ifdef CONFIG_BATMAN_ADV_DEBUG
 779         atomic_set(&bat_priv->log_level, 0);
 780 #endif
 781         atomic_set(&bat_priv->fragmentation, 1);
 782         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 783         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 784         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 785
 786         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 787         atomic_set(&bat_priv->bcast_seqno, 1);
 788         atomic_set(&bat_priv->tt.vn, 0);
 789         atomic_set(&bat_priv->tt.local_changes, 0);
 790         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 791 #ifdef CONFIG_BATMAN_ADV_BLA
 792         atomic_set(&bat_priv->bla.num_requests, 0);
 793 #endif
 794         bat_priv->tt.last_changeset = NULL;
 795         bat_priv->tt.last_changeset_len = 0;
 796         bat_priv->isolation_mark = 0;
 797         bat_priv->isolation_mark_mask = 0;
 798
 799         /* randomize initial seqno to avoid collision */
 800         get_random_bytes(&random_seqno, sizeof(random_seqno));
 801         atomic_set(&bat_priv->frag_seqno, random_seqno);
 802
 803         bat_priv->primary_if = NULL;
 804         bat_priv->num_ifaces = 0;
 805
 806         batadv_nc_init_bat_priv(bat_priv);
 807
 808         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 809         if (ret < 0)
 810                 goto free_bat_counters;
 811
 812         ret = batadv_debugfs_add_meshif(dev);
 813         if (ret < 0)
 814                 goto free_bat_counters;
 815
 816         ret = batadv_mesh_init(dev);
 817         if (ret < 0)
 818                 goto unreg_debugfs;
 819
 820         return 0;
 821
 822 unreg_debugfs:
 823         batadv_debugfs_del_meshif(dev);
 824 free_bat_counters:
 825         free_percpu(bat_priv->bat_counters);
 826         bat_priv->bat_counters = NULL;
 827
 828         return ret;
 829 }
 830
 831 /**
 832  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
 833  * @dev: batadv_soft_interface used as master interface
 834  * @slave_dev: net_device which should become the slave interface
 835  *
 836  * Return 0 if successful or error otherwise.
 837  */
 838 static int batadv_softif_slave_add(struct net_device *dev,
 839                                    struct net_device *slave_dev)
 840 {
 841         struct batadv_hard_iface *hard_iface;
 842         int ret = -EINVAL;
 843
 844         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 845         if (!hard_iface || hard_iface->soft_iface)
 846                 goto out;
 847
 848         ret = batadv_hardif_enable_interface(hard_iface, dev->name);
 849
 850 out:
 851         if (hard_iface)
 852                 batadv_hardif_free_ref(hard_iface);
 853         return ret;
 854 }
 855
 856 /**
 857  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
 858  * @dev: batadv_soft_interface used as master interface
 859  * @slave_dev: net_device which should be removed from the master interface
 860  *
 861  * Return 0 if successful or error otherwise.
 862  */
 863 static int batadv_softif_slave_del(struct net_device *dev,
 864                                    struct net_device *slave_dev)
 865 {
 866         struct batadv_hard_iface *hard_iface;
 867         int ret = -EINVAL;
 868
 869         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 870
 871         if (!hard_iface || hard_iface->soft_iface != dev)
 872                 goto out;
 873
 874         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 875         ret = 0;
 876
 877 out:
 878         if (hard_iface)
 879                 batadv_hardif_free_ref(hard_iface);
 880         return ret;
 881 }
 882
 883 static const struct net_device_ops batadv_netdev_ops = {
 884         .ndo_init = batadv_softif_init_late,
 885         .ndo_open = batadv_interface_open,
 886         .ndo_stop = batadv_interface_release,
 887         .ndo_get_stats = batadv_interface_stats,
 888         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 889         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 890         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 891         .ndo_change_mtu = batadv_interface_change_mtu,
 892         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 893         .ndo_start_xmit = batadv_interface_tx,
 894         .ndo_validate_addr = eth_validate_addr,
 895         .ndo_add_slave = batadv_softif_slave_add,
 896         .ndo_del_slave = batadv_softif_slave_del,
 897 };
 898
 899 /**
 900  * batadv_softif_free - Deconstructor of batadv_soft_interface
 901  * @dev: Device to cleanup and remove
 902  */
 903 static void batadv_softif_free(struct net_device *dev)
 904 {
 905         batadv_debugfs_del_meshif(dev);
 906         batadv_mesh_free(dev);
 907
 908         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
 909          * their tasks. Wait for them all to be finished before freeing the
 910          * netdev and its private data (bat_priv)
 911          */
 912         rcu_barrier();
 913
 914         free_netdev(dev);
 915 }
 916
 917 /**
 918  * batadv_softif_init_early - early stage initialization of soft interface
 919  * @dev: registered network device to modify
 920  */
 921 static void batadv_softif_init_early(struct net_device *dev)
 922 {
 923         struct batadv_priv *priv = netdev_priv(dev);
 924
 925         ether_setup(dev);
 926
 927         dev->netdev_ops = &batadv_netdev_ops;
 928         dev->destructor = batadv_softif_free;
 929         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 930         dev->tx_queue_len = 0;
 931
 932         /* can't call min_mtu, because the needed variables
 933          * have not been initialized yet
 934          */
 935         dev->mtu = ETH_DATA_LEN;
 936         /* reserve more space in the skbuff for our header */
 937         dev->hard_header_len = batadv_max_header_len();
 938
 939         /* generate random address */
 940         eth_hw_addr_random(dev);
 941
 942         dev->ethtool_ops = &batadv_ethtool_ops;
 943
 944         memset(priv, 0, sizeof(*priv));
 945 }
 946
 947 struct net_device *batadv_softif_create(const char *name)
 948 {
 949         struct net_device *soft_iface;
 950         int ret;
 951
 952         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
 953                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
 954         if (!soft_iface)
 955                 return NULL;
 956
 957         soft_iface->rtnl_link_ops = &batadv_link_ops;
 958
 959         ret = register_netdevice(soft_iface);
 960         if (ret < 0) {
 961                 pr_err("Unable to register the batman interface '%s': %i\n",
 962                        name, ret);
 963                 free_netdev(soft_iface);
 964                 return NULL;
 965         }
 966
 967         return soft_iface;
 968 }
 969
 970 /**
 971  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
 972  * @soft_iface: the to-be-removed batman-adv interface
 973  */
 974 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 975 {
 976         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 977
 978         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 979 }
 980
 981 /**
 982  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
 983  * @soft_iface: the to-be-removed batman-adv interface
 984  * @head: list pointer
 985  */
 986 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 987                                           struct list_head *head)
 988 {
 989         struct batadv_hard_iface *hard_iface;
 990
 991         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 992                 if (hard_iface->soft_iface == soft_iface)
 993                         batadv_hardif_disable_interface(hard_iface,
 994                                                         BATADV_IF_CLEANUP_KEEP);
 995         }
 996
 997         batadv_sysfs_del_meshif(soft_iface);
 998         unregister_netdevice_queue(soft_iface, head);
 999 }
1000
1001 int batadv_softif_is_valid(const struct net_device *net_dev)
1002 {
1003         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1004                 return 1;
1005
1006         return 0;
1007 }
1008
1009 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1010         .kind           = "batadv",
1011         .priv_size      = sizeof(struct batadv_priv),
1012         .setup          = batadv_softif_init_early,
1013         .dellink        = batadv_softif_destroy_netlink,
1014 };
1015
1016 /* ethtool */
1017 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1018 {
1019         cmd->supported = 0;
1020         cmd->advertising = 0;
1021         ethtool_cmd_speed_set(cmd, SPEED_10);
1022         cmd->duplex = DUPLEX_FULL;
1023         cmd->port = PORT_TP;
1024         cmd->phy_address = 0;
1025         cmd->transceiver = XCVR_INTERNAL;
1026         cmd->autoneg = AUTONEG_DISABLE;
1027         cmd->maxtxpkt = 0;
1028         cmd->maxrxpkt = 0;
1029
1030         return 0;
1031 }
1032
1033 static void batadv_get_drvinfo(struct net_device *dev,
1034                                struct ethtool_drvinfo *info)
1035 {
1036         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1037         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1038         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1039         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1040 }
1041
1042 static u32 batadv_get_msglevel(struct net_device *dev)
1043 {
1044         return -EOPNOTSUPP;
1045 }
1046
1047 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1048 {
1049 }
1050
1051 static u32 batadv_get_link(struct net_device *dev)
1052 {
1053         return 1;
1054 }
1055
1056 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1057  * Declare each description string in struct.name[] to get fixed sized buffer
1058  * and compile time checking for strings longer than ETH_GSTRING_LEN.
1059  */
1060 static const struct {
1061         const char name[ETH_GSTRING_LEN];
1062 } batadv_counters_strings[] = {
1063         { "tx" },
1064         { "tx_bytes" },
1065         { "tx_dropped" },
1066         { "rx" },
1067         { "rx_bytes" },
1068         { "forward" },
1069         { "forward_bytes" },
1070         { "mgmt_tx" },
1071         { "mgmt_tx_bytes" },
1072         { "mgmt_rx" },
1073         { "mgmt_rx_bytes" },
1074         { "frag_tx" },
1075         { "frag_tx_bytes" },
1076         { "frag_rx" },
1077         { "frag_rx_bytes" },
1078         { "frag_fwd" },
1079         { "frag_fwd_bytes" },
1080         { "tt_request_tx" },
1081         { "tt_request_rx" },
1082         { "tt_response_tx" },
1083         { "tt_response_rx" },
1084         { "tt_roam_adv_tx" },
1085         { "tt_roam_adv_rx" },
1086 #ifdef CONFIG_BATMAN_ADV_DAT
1087         { "dat_get_tx" },
1088         { "dat_get_rx" },
1089         { "dat_put_tx" },
1090         { "dat_put_rx" },
1091         { "dat_cached_reply_tx" },
1092 #endif
1093 #ifdef CONFIG_BATMAN_ADV_NC
1094         { "nc_code" },
1095         { "nc_code_bytes" },
1096         { "nc_recode" },
1097         { "nc_recode_bytes" },
1098         { "nc_buffer" },
1099         { "nc_decode" },
1100         { "nc_decode_bytes" },
1101         { "nc_decode_failed" },
1102         { "nc_sniffed" },
1103 #endif
1104 };
1105
1106 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
1107                                uint8_t *data)
1108 {
1109         if (stringset == ETH_SS_STATS)
1110                 memcpy(data, batadv_counters_strings,
1111                        sizeof(batadv_counters_strings));
1112 }
1113
1114 static void batadv_get_ethtool_stats(struct net_device *dev,
1115                                      struct ethtool_stats *stats,
1116                                      uint64_t *data)
1117 {
1118         struct batadv_priv *bat_priv = netdev_priv(dev);
1119         int i;
1120
1121         for (i = 0; i < BATADV_CNT_NUM; i++)
1122                 data[i] = batadv_sum_counter(bat_priv, i);
1123 }
1124
1125 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1126 {
1127         if (stringset == ETH_SS_STATS)
1128                 return BATADV_CNT_NUM;
1129
1130         return -EOPNOTSUPP;
1131 }