linux/net/batman-adv/soft-interface.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (C) B.A.T.M.A.N. contributors:
   3 *
   4 * Marek Lindner, Simon Wunderlich
   5 */
   6
   7#include "soft-interface.h"
   8#include "main.h"
   9
  10#include <linux/atomic.h>
  11#include <linux/byteorder/generic.h>
  12#include <linux/cache.h>
  13#include <linux/compiler.h>
  14#include <linux/cpumask.h>
  15#include <linux/errno.h>
  16#include <linux/etherdevice.h>
  17#include <linux/ethtool.h>
  18#include <linux/gfp.h>
  19#include <linux/if_ether.h>
  20#include <linux/if_vlan.h>
  21#include <linux/jiffies.h>
  22#include <linux/kernel.h>
  23#include <linux/kref.h>
  24#include <linux/list.h>
  25#include <linux/lockdep.h>
  26#include <linux/netdevice.h>
  27#include <linux/netlink.h>
  28#include <linux/percpu.h>
  29#include <linux/random.h>
  30#include <linux/rculist.h>
  31#include <linux/rcupdate.h>
  32#include <linux/skbuff.h>
  33#include <linux/slab.h>
  34#include <linux/socket.h>
  35#include <linux/spinlock.h>
  36#include <linux/stddef.h>
  37#include <linux/string.h>
  38#include <linux/types.h>
  39#include <net/net_namespace.h>
  40#include <net/netlink.h>
  41#include <uapi/linux/batadv_packet.h>
  42#include <uapi/linux/batman_adv.h>
  43
  44#include "bat_algo.h"
  45#include "bridge_loop_avoidance.h"
  46#include "distributed-arp-table.h"
  47#include "gateway_client.h"
  48#include "hard-interface.h"
  49#include "multicast.h"
  50#include "network-coding.h"
  51#include "originator.h"
  52#include "send.h"
  53#include "translation-table.h"
  54
  55/**
  56 * batadv_skb_head_push() - Increase header size and move (push) head pointer
  57 * @skb: packet buffer which should be modified
  58 * @len: number of bytes to add
  59 *
  60 * Return: 0 on success or negative error number in case of failure
  61 */
  62int 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
  68         * to 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
  81static int batadv_interface_open(struct net_device *dev)
  82{
  83        netif_start_queue(dev);
  84        return 0;
  85}
  86
  87static int batadv_interface_release(struct net_device *dev)
  88{
  89        netif_stop_queue(dev);
  90        return 0;
  91}
  92
  93/**
  94 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
  95 * @bat_priv: the bat priv with all the soft interface information
  96 * @idx: index of counter to sum up
  97 *
  98 * Return: sum of all cpu-local counters
  99 */
 100static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
 101{
 102        u64 *counters, sum = 0;
 103        int cpu;
 104
 105        for_each_possible_cpu(cpu) {
 106                counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 107                sum += counters[idx];
 108        }
 109
 110        return sum;
 111}
 112
 113static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
 114{
 115        struct batadv_priv *bat_priv = netdev_priv(dev);
 116        struct net_device_stats *stats = &dev->stats;
 117
 118        stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 119        stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 120        stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 121        stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 122        stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 123        return stats;
 124}
 125
 126static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 127{
 128        struct batadv_priv *bat_priv = netdev_priv(dev);
 129        struct batadv_softif_vlan *vlan;
 130        struct sockaddr *addr = p;
 131        u8 old_addr[ETH_ALEN];
 132
 133        if (!is_valid_ether_addr(addr->sa_data))
 134                return -EADDRNOTAVAIL;
 135
 136        ether_addr_copy(old_addr, dev->dev_addr);
 137        ether_addr_copy(dev->dev_addr, addr->sa_data);
 138
 139        /* only modify transtable if it has been initialized before */
 140        if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 141                return 0;
 142
 143        rcu_read_lock();
 144        hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 145                batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
 146                                       "mac address changed", false);
 147                batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
 148                                    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 149        }
 150        rcu_read_unlock();
 151
 152        return 0;
 153}
 154
 155static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 156{
 157        /* check ranges */
 158        if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
 159                return -EINVAL;
 160
 161        dev->mtu = new_mtu;
 162
 163        return 0;
 164}
 165
 166/**
 167 * batadv_interface_set_rx_mode() - set the rx mode of a device
 168 * @dev: registered network device to modify
 169 *
 170 * We do not actually need to set any rx filters for the virtual batman
 171 * soft interface. However a dummy handler enables a user to set static
 172 * multicast listeners for instance.
 173 */
 174static void batadv_interface_set_rx_mode(struct net_device *dev)
 175{
 176}
 177
 178static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 179                                       struct net_device *soft_iface)
 180{
 181        struct ethhdr *ethhdr;
 182        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 183        struct batadv_hard_iface *primary_if = NULL;
 184        struct batadv_bcast_packet *bcast_packet;
 185        static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 186                                              0x00, 0x00};
 187        static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 188                                               0x00, 0x00};
 189        enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
 190        u8 *dst_hint = NULL, chaddr[ETH_ALEN];
 191        struct vlan_ethhdr *vhdr;
 192        unsigned int header_len = 0;
 193        int data_len = skb->len, ret;
 194        unsigned long brd_delay = 0;
 195        bool do_bcast = false, client_added;
 196        unsigned short vid;
 197        u32 seqno;
 198        int gw_mode;
 199        enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
 200        struct batadv_orig_node *mcast_single_orig = NULL;
 201        int network_offset = ETH_HLEN;
 202        __be16 proto;
 203
 204        if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 205                goto dropped;
 206
 207        /* reset control block to avoid left overs from previous users */
 208        memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
 209
 210        netif_trans_update(soft_iface);
 211        vid = batadv_get_vid(skb, 0);
 212
 213        skb_reset_mac_header(skb);
 214        ethhdr = eth_hdr(skb);
 215
 216        proto = ethhdr->h_proto;
 217
 218        switch (ntohs(proto)) {
 219        case ETH_P_8021Q:
 220                if (!pskb_may_pull(skb, sizeof(*vhdr)))
 221                        goto dropped;
 222                vhdr = vlan_eth_hdr(skb);
 223                proto = vhdr->h_vlan_encapsulated_proto;
 224
 225                /* drop batman-in-batman packets to prevent loops */
 226                if (proto != htons(ETH_P_BATMAN)) {
 227                        network_offset += VLAN_HLEN;
 228                        break;
 229                }
 230
 231                fallthrough;
 232        case ETH_P_BATMAN:
 233                goto dropped;
 234        }
 235
 236        skb_set_network_header(skb, network_offset);
 237
 238        if (batadv_bla_tx(bat_priv, skb, vid))
 239                goto dropped;
 240
 241        /* skb->data might have been reallocated by batadv_bla_tx() */
 242        ethhdr = eth_hdr(skb);
 243
 244        /* Register the client MAC in the transtable */
 245        if (!is_multicast_ether_addr(ethhdr->h_source) &&
 246            !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
 247                client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 248                                                   vid, skb->skb_iif,
 249                                                   skb->mark);
 250                if (!client_added)
 251                        goto dropped;
 252        }
 253
 254        /* Snoop address candidates from DHCPACKs for early DAT filling */
 255        batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
 256
 257        /* don't accept stp packets. STP does not help in meshes.
 258         * better use the bridge loop avoidance ...
 259         *
 260         * The same goes for ECTP sent at least by some Cisco Switches,
 261         * it might confuse the mesh when used with bridge loop avoidance.
 262         */
 263        if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 264                goto dropped;
 265
 266        if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 267                goto dropped;
 268
 269        gw_mode = atomic_read(&bat_priv->gw.mode);
 270        if (is_multicast_ether_addr(ethhdr->h_dest)) {
 271                /* if gw mode is off, broadcast every packet */
 272                if (gw_mode == BATADV_GW_MODE_OFF) {
 273                        do_bcast = true;
 274                        goto send;
 275                }
 276
 277                dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
 278                                                        chaddr);
 279                /* skb->data may have been modified by
 280                 * batadv_gw_dhcp_recipient_get()
 281                 */
 282                ethhdr = eth_hdr(skb);
 283                /* if gw_mode is on, broadcast any non-DHCP message.
 284                 * All the DHCP packets are going to be sent as unicast
 285                 */
 286                if (dhcp_rcp == BATADV_DHCP_NO) {
 287                        do_bcast = true;
 288                        goto send;
 289                }
 290
 291                if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
 292                        dst_hint = chaddr;
 293                else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
 294                         (dhcp_rcp == BATADV_DHCP_TO_SERVER))
 295                        /* gateways should not forward any DHCP message if
 296                         * directed to a DHCP server
 297                         */
 298                        goto dropped;
 299
 300send:
 301                if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 302                        forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
 303                                                           &mcast_single_orig);
 304                        if (forw_mode == BATADV_FORW_NONE)
 305                                goto dropped;
 306
 307                        if (forw_mode == BATADV_FORW_SINGLE ||
 308                            forw_mode == BATADV_FORW_SOME)
 309                                do_bcast = false;
 310                }
 311        }
 312
 313        batadv_skb_set_priority(skb, 0);
 314
 315        /* ethernet packet should be broadcasted */
 316        if (do_bcast) {
 317                primary_if = batadv_primary_if_get_selected(bat_priv);
 318                if (!primary_if)
 319                        goto dropped;
 320
 321                /* in case of ARP request, we do not immediately broadcasti the
 322                 * packet, instead we first wait for DAT to try to retrieve the
 323                 * correct ARP entry
 324                 */
 325                if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 326                        brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 327
 328                if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 329                        goto dropped;
 330
 331                bcast_packet = (struct batadv_bcast_packet *)skb->data;
 332                bcast_packet->version = BATADV_COMPAT_VERSION;
 333                bcast_packet->ttl = BATADV_TTL - 1;
 334
 335                /* batman packet type: broadcast */
 336                bcast_packet->packet_type = BATADV_BCAST;
 337                bcast_packet->reserved = 0;
 338
 339                /* hw address of first interface is the orig mac because only
 340                 * this mac is known throughout the mesh
 341                 */
 342                ether_addr_copy(bcast_packet->orig,
 343                                primary_if->net_dev->dev_addr);
 344
 345                /* set broadcast sequence number */
 346                seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 347                bcast_packet->seqno = htonl(seqno);
 348
 349                batadv_send_bcast_packet(bat_priv, skb, brd_delay, true);
 350        /* unicast packet */
 351        } else {
 352                /* DHCP packets going to a server will use the GW feature */
 353                if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
 354                        ret = batadv_gw_out_of_range(bat_priv, skb);
 355                        if (ret)
 356                                goto dropped;
 357                        ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 358                } else if (mcast_single_orig) {
 359                        ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
 360                                                          mcast_single_orig);
 361                } else if (forw_mode == BATADV_FORW_SOME) {
 362                        ret = batadv_mcast_forw_send(bat_priv, skb, vid);
 363                } else {
 364                        if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 365                                                                  skb))
 366                                goto dropped;
 367
 368                        batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 369
 370                        ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 371                                                     vid);
 372                }
 373                if (ret != NET_XMIT_SUCCESS)
 374                        goto dropped_freed;
 375        }
 376
 377        batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 378        batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 379        goto end;
 380
 381dropped:
 382        kfree_skb(skb);
 383dropped_freed:
 384        batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 385end:
 386        if (mcast_single_orig)
 387                batadv_orig_node_put(mcast_single_orig);
 388        if (primary_if)
 389                batadv_hardif_put(primary_if);
 390        return NETDEV_TX_OK;
 391}
 392
 393/**
 394 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
 395 * @soft_iface: local interface which will receive the ethernet frame
 396 * @skb: ethernet frame for @soft_iface
 397 * @hdr_size: size of already parsed batman-adv header
 398 * @orig_node: originator from which the batman-adv packet was sent
 399 *
 400 * Sends an ethernet frame to the receive path of the local @soft_iface.
 401 * skb->data has still point to the batman-adv header with the size @hdr_size.
 402 * The caller has to have parsed this header already and made sure that at least
 403 * @hdr_size bytes are still available for pull in @skb.
 404 *
 405 * The packet may still get dropped. This can happen when the encapsulated
 406 * ethernet frame is invalid or contains again an batman-adv packet. Also
 407 * unicast packets will be dropped directly when it was sent between two
 408 * isolated clients.
 409 */
 410void batadv_interface_rx(struct net_device *soft_iface,
 411                         struct sk_buff *skb, int hdr_size,
 412                         struct batadv_orig_node *orig_node)
 413{
 414        struct batadv_bcast_packet *batadv_bcast_packet;
 415        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 416        struct vlan_ethhdr *vhdr;
 417        struct ethhdr *ethhdr;
 418        unsigned short vid;
 419        int packet_type;
 420
 421        batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 422        packet_type = batadv_bcast_packet->packet_type;
 423
 424        skb_pull_rcsum(skb, hdr_size);
 425        skb_reset_mac_header(skb);
 426
 427        /* clean the netfilter state now that the batman-adv header has been
 428         * removed
 429         */
 430        nf_reset_ct(skb);
 431
 432        if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 433                goto dropped;
 434
 435        vid = batadv_get_vid(skb, 0);
 436        ethhdr = eth_hdr(skb);
 437
 438        switch (ntohs(ethhdr->h_proto)) {
 439        case ETH_P_8021Q:
 440                if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
 441                        goto dropped;
 442
 443                vhdr = (struct vlan_ethhdr *)skb->data;
 444
 445                /* drop batman-in-batman packets to prevent loops */
 446                if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 447                        break;
 448
 449                fallthrough;
 450        case ETH_P_BATMAN:
 451                goto dropped;
 452        }
 453
 454        /* skb->dev & skb->pkt_type are set here */
 455        skb->protocol = eth_type_trans(skb, soft_iface);
 456        skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 457
 458        batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 459        batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 460                           skb->len + ETH_HLEN);
 461
 462        /* Let the bridge loop avoidance check the packet. If will
 463         * not handle it, we can safely push it up.
 464         */
 465        if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
 466                goto out;
 467
 468        if (orig_node)
 469                batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 470                                                     ethhdr->h_source, vid);
 471
 472        if (is_multicast_ether_addr(ethhdr->h_dest)) {
 473                /* set the mark on broadcast packets if AP isolation is ON and
 474                 * the packet is coming from an "isolated" client
 475                 */
 476                if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 477                    batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 478                                                 vid)) {
 479                        /* save bits in skb->mark not covered by the mask and
 480                         * apply the mark on the rest
 481                         */
 482                        skb->mark &= ~bat_priv->isolation_mark_mask;
 483                        skb->mark |= bat_priv->isolation_mark;
 484                }
 485        } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 486                                         ethhdr->h_dest, vid)) {
 487                goto dropped;
 488        }
 489
 490        netif_rx(skb);
 491        goto out;
 492
 493dropped:
 494        kfree_skb(skb);
 495out:
 496        return;
 497}
 498
 499/**
 500 * batadv_softif_vlan_release() - release vlan from lists and queue for free
 501 *  after rcu grace period
 502 * @ref: kref pointer of the vlan object
 503 */
 504static void batadv_softif_vlan_release(struct kref *ref)
 505{
 506        struct batadv_softif_vlan *vlan;
 507
 508        vlan = container_of(ref, struct batadv_softif_vlan, refcount);
 509
 510        spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 511        hlist_del_rcu(&vlan->list);
 512        spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 513
 514        kfree_rcu(vlan, rcu);
 515}
 516
 517/**
 518 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
 519 *  possibly release it
 520 * @vlan: the vlan object to release
 521 */
 522void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
 523{
 524        if (!vlan)
 525                return;
 526
 527        kref_put(&vlan->refcount, batadv_softif_vlan_release);
 528}
 529
 530/**
 531 * batadv_softif_vlan_get() - get the vlan object for a specific vid
 532 * @bat_priv: the bat priv with all the soft interface information
 533 * @vid: the identifier of the vlan object to retrieve
 534 *
 535 * Return: the private data of the vlan matching the vid passed as argument or
 536 * NULL otherwise. The refcounter of the returned object is incremented by 1.
 537 */
 538struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 539                                                  unsigned short vid)
 540{
 541        struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 542
 543        rcu_read_lock();
 544        hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 545                if (vlan_tmp->vid != vid)
 546                        continue;
 547
 548                if (!kref_get_unless_zero(&vlan_tmp->refcount))
 549                        continue;
 550
 551                vlan = vlan_tmp;
 552                break;
 553        }
 554        rcu_read_unlock();
 555
 556        return vlan;
 557}
 558
 559/**
 560 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
 561 * @bat_priv: the bat priv with all the soft interface information
 562 * @vid: the VLAN identifier
 563 *
 564 * Return: 0 on success, a negative error otherwise.
 565 */
 566int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 567{
 568        struct batadv_softif_vlan *vlan;
 569
 570        spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 571
 572        vlan = batadv_softif_vlan_get(bat_priv, vid);
 573        if (vlan) {
 574                batadv_softif_vlan_put(vlan);
 575                spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 576                return -EEXIST;
 577        }
 578
 579        vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 580        if (!vlan) {
 581                spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 582                return -ENOMEM;
 583        }
 584
 585        vlan->bat_priv = bat_priv;
 586        vlan->vid = vid;
 587        kref_init(&vlan->refcount);
 588
 589        atomic_set(&vlan->ap_isolation, 0);
 590
 591        kref_get(&vlan->refcount);
 592        hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 593        spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 594
 595        /* add a new TT local entry. This one will be marked with the NOPURGE
 596         * flag
 597         */
 598        batadv_tt_local_add(bat_priv->soft_iface,
 599                            bat_priv->soft_iface->dev_addr, vid,
 600                            BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 601
 602        /* don't return reference to new softif_vlan */
 603        batadv_softif_vlan_put(vlan);
 604
 605        return 0;
 606}
 607
 608/**
 609 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
 610 * @bat_priv: the bat priv with all the soft interface information
 611 * @vlan: the object to remove
 612 */
 613static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 614                                       struct batadv_softif_vlan *vlan)
 615{
 616        /* explicitly remove the associated TT local entry because it is marked
 617         * with the NOPURGE flag
 618         */
 619        batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 620                               vlan->vid, "vlan interface destroyed", false);
 621
 622        batadv_softif_vlan_put(vlan);
 623}
 624
 625/**
 626 * batadv_interface_add_vid() - ndo_add_vid API implementation
 627 * @dev: the netdev of the mesh interface
 628 * @proto: protocol of the vlan id
 629 * @vid: identifier of the new vlan
 630 *
 631 * Set up all the internal structures for handling the new vlan on top of the
 632 * mesh interface
 633 *
 634 * Return: 0 on success or a negative error code in case of failure.
 635 */
 636static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 637                                    unsigned short vid)
 638{
 639        struct batadv_priv *bat_priv = netdev_priv(dev);
 640        struct batadv_softif_vlan *vlan;
 641
 642        /* only 802.1Q vlans are supported.
 643         * batman-adv does not know how to handle other types
 644         */
 645        if (proto != htons(ETH_P_8021Q))
 646                return -EINVAL;
 647
 648        vid |= BATADV_VLAN_HAS_TAG;
 649
 650        /* if a new vlan is getting created and it already exists, it means that
 651         * it was not deleted yet. batadv_softif_vlan_get() increases the
 652         * refcount in order to revive the object.
 653         *
 654         * if it does not exist then create it.
 655         */
 656        vlan = batadv_softif_vlan_get(bat_priv, vid);
 657        if (!vlan)
 658                return batadv_softif_create_vlan(bat_priv, vid);
 659
 660        /* add a new TT local entry. This one will be marked with the NOPURGE
 661         * flag. This must be added again, even if the vlan object already
 662         * exists, because the entry was deleted by kill_vid()
 663         */
 664        batadv_tt_local_add(bat_priv->soft_iface,
 665                            bat_priv->soft_iface->dev_addr, vid,
 666                            BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 667
 668        return 0;
 669}
 670
 671/**
 672 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
 673 * @dev: the netdev of the mesh interface
 674 * @proto: protocol of the vlan id
 675 * @vid: identifier of the deleted vlan
 676 *
 677 * Destroy all the internal structures used to handle the vlan identified by vid
 678 * on top of the mesh interface
 679 *
 680 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 681 * or -ENOENT if the specified vlan id wasn't registered.
 682 */
 683static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 684                                     unsigned short vid)
 685{
 686        struct batadv_priv *bat_priv = netdev_priv(dev);
 687        struct batadv_softif_vlan *vlan;
 688
 689        /* only 802.1Q vlans are supported. batman-adv does not know how to
 690         * handle other types
 691         */
 692        if (proto != htons(ETH_P_8021Q))
 693                return -EINVAL;
 694
 695        vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 696        if (!vlan)
 697                return -ENOENT;
 698
 699        batadv_softif_destroy_vlan(bat_priv, vlan);
 700
 701        /* finally free the vlan object */
 702        batadv_softif_vlan_put(vlan);
 703
 704        return 0;
 705}
 706
 707/* batman-adv network devices have devices nesting below it and are a special
 708 * "super class" of normal network devices; split their locks off into a
 709 * separate class since they always nest.
 710 */
 711static struct lock_class_key batadv_netdev_xmit_lock_key;
 712static struct lock_class_key batadv_netdev_addr_lock_key;
 713
 714/**
 715 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
 716 * @dev: device which owns the tx queue
 717 * @txq: tx queue to modify
 718 * @_unused: always NULL
 719 */
 720static void batadv_set_lockdep_class_one(struct net_device *dev,
 721                                         struct netdev_queue *txq,
 722                                         void *_unused)
 723{
 724        lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 725}
 726
 727/**
 728 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
 729 * @dev: network device to modify
 730 */
 731static void batadv_set_lockdep_class(struct net_device *dev)
 732{
 733        lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 734        netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 735}
 736
 737/**
 738 * batadv_softif_init_late() - late stage initialization of soft interface
 739 * @dev: registered network device to modify
 740 *
 741 * Return: error code on failures
 742 */
 743static int batadv_softif_init_late(struct net_device *dev)
 744{
 745        struct batadv_priv *bat_priv;
 746        u32 random_seqno;
 747        int ret;
 748        size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
 749
 750        batadv_set_lockdep_class(dev);
 751
 752        bat_priv = netdev_priv(dev);
 753        bat_priv->soft_iface = dev;
 754
 755        /* batadv_interface_stats() needs to be available as soon as
 756         * register_netdevice() has been called
 757         */
 758        bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
 759        if (!bat_priv->bat_counters)
 760                return -ENOMEM;
 761
 762        atomic_set(&bat_priv->aggregated_ogms, 1);
 763        atomic_set(&bat_priv->bonding, 0);
 764#ifdef CONFIG_BATMAN_ADV_BLA
 765        atomic_set(&bat_priv->bridge_loop_avoidance, 1);
 766#endif
 767#ifdef CONFIG_BATMAN_ADV_DAT
 768        atomic_set(&bat_priv->distributed_arp_table, 1);
 769#endif
 770#ifdef CONFIG_BATMAN_ADV_MCAST
 771        atomic_set(&bat_priv->multicast_mode, 1);
 772        atomic_set(&bat_priv->multicast_fanout, 16);
 773        atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 774        atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 775        atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 776#endif
 777        atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
 778        atomic_set(&bat_priv->gw.bandwidth_down, 100);
 779        atomic_set(&bat_priv->gw.bandwidth_up, 20);
 780        atomic_set(&bat_priv->orig_interval, 1000);
 781        atomic_set(&bat_priv->hop_penalty, 30);
 782#ifdef CONFIG_BATMAN_ADV_DEBUG
 783        atomic_set(&bat_priv->log_level, 0);
 784#endif
 785        atomic_set(&bat_priv->fragmentation, 1);
 786        atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 787        atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 788        atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 789
 790        atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 791        atomic_set(&bat_priv->bcast_seqno, 1);
 792        atomic_set(&bat_priv->tt.vn, 0);
 793        atomic_set(&bat_priv->tt.local_changes, 0);
 794        atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 795#ifdef CONFIG_BATMAN_ADV_BLA
 796        atomic_set(&bat_priv->bla.num_requests, 0);
 797#endif
 798        atomic_set(&bat_priv->tp_num, 0);
 799
 800        bat_priv->tt.last_changeset = NULL;
 801        bat_priv->tt.last_changeset_len = 0;
 802        bat_priv->isolation_mark = 0;
 803        bat_priv->isolation_mark_mask = 0;
 804
 805        /* randomize initial seqno to avoid collision */
 806        get_random_bytes(&random_seqno, sizeof(random_seqno));
 807        atomic_set(&bat_priv->frag_seqno, random_seqno);
 808
 809        bat_priv->primary_if = NULL;
 810
 811        batadv_nc_init_bat_priv(bat_priv);
 812
 813        if (!bat_priv->algo_ops) {
 814                ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 815                if (ret < 0)
 816                        goto free_bat_counters;
 817        }
 818
 819        ret = batadv_mesh_init(dev);
 820        if (ret < 0)
 821                goto free_bat_counters;
 822
 823        return 0;
 824
 825free_bat_counters:
 826        free_percpu(bat_priv->bat_counters);
 827        bat_priv->bat_counters = NULL;
 828
 829        return ret;
 830}
 831
 832/**
 833 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
 834 * @dev: batadv_soft_interface used as master interface
 835 * @slave_dev: net_device which should become the slave interface
 836 * @extack: extended ACK report struct
 837 *
 838 * Return: 0 if successful or error otherwise.
 839 */
 840static int batadv_softif_slave_add(struct net_device *dev,
 841                                   struct net_device *slave_dev,
 842                                   struct netlink_ext_ack *extack)
 843{
 844        struct batadv_hard_iface *hard_iface;
 845        int ret = -EINVAL;
 846
 847        hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 848        if (!hard_iface || hard_iface->soft_iface)
 849                goto out;
 850
 851        ret = batadv_hardif_enable_interface(hard_iface, dev);
 852
 853out:
 854        if (hard_iface)
 855                batadv_hardif_put(hard_iface);
 856        return ret;
 857}
 858
 859/**
 860 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
 861 * @dev: batadv_soft_interface used as master interface
 862 * @slave_dev: net_device which should be removed from the master interface
 863 *
 864 * Return: 0 if successful or error otherwise.
 865 */
 866static int batadv_softif_slave_del(struct net_device *dev,
 867                                   struct net_device *slave_dev)
 868{
 869        struct batadv_hard_iface *hard_iface;
 870        int ret = -EINVAL;
 871
 872        hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 873
 874        if (!hard_iface || hard_iface->soft_iface != dev)
 875                goto out;
 876
 877        batadv_hardif_disable_interface(hard_iface);
 878        ret = 0;
 879
 880out:
 881        if (hard_iface)
 882                batadv_hardif_put(hard_iface);
 883        return ret;
 884}
 885
 886static const struct net_device_ops batadv_netdev_ops = {
 887        .ndo_init = batadv_softif_init_late,
 888        .ndo_open = batadv_interface_open,
 889        .ndo_stop = batadv_interface_release,
 890        .ndo_get_stats = batadv_interface_stats,
 891        .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 892        .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 893        .ndo_set_mac_address = batadv_interface_set_mac_addr,
 894        .ndo_change_mtu = batadv_interface_change_mtu,
 895        .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 896        .ndo_start_xmit = batadv_interface_tx,
 897        .ndo_validate_addr = eth_validate_addr,
 898        .ndo_add_slave = batadv_softif_slave_add,
 899        .ndo_del_slave = batadv_softif_slave_del,
 900};
 901
 902static void batadv_get_drvinfo(struct net_device *dev,
 903                               struct ethtool_drvinfo *info)
 904{
 905        strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 906        strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 907        strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 908        strscpy(info->bus_info, "batman", sizeof(info->bus_info));
 909}
 910
 911/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 912 * Declare each description string in struct.name[] to get fixed sized buffer
 913 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 914 */
 915static const struct {
 916        const char name[ETH_GSTRING_LEN];
 917} batadv_counters_strings[] = {
 918        { "tx" },
 919        { "tx_bytes" },
 920        { "tx_dropped" },
 921        { "rx" },
 922        { "rx_bytes" },
 923        { "forward" },
 924        { "forward_bytes" },
 925        { "mgmt_tx" },
 926        { "mgmt_tx_bytes" },
 927        { "mgmt_rx" },
 928        { "mgmt_rx_bytes" },
 929        { "frag_tx" },
 930        { "frag_tx_bytes" },
 931        { "frag_rx" },
 932        { "frag_rx_bytes" },
 933        { "frag_fwd" },
 934        { "frag_fwd_bytes" },
 935        { "tt_request_tx" },
 936        { "tt_request_rx" },
 937        { "tt_response_tx" },
 938        { "tt_response_rx" },
 939        { "tt_roam_adv_tx" },
 940        { "tt_roam_adv_rx" },
 941#ifdef CONFIG_BATMAN_ADV_DAT
 942        { "dat_get_tx" },
 943        { "dat_get_rx" },
 944        { "dat_put_tx" },
 945        { "dat_put_rx" },
 946        { "dat_cached_reply_tx" },
 947#endif
 948#ifdef CONFIG_BATMAN_ADV_NC
 949        { "nc_code" },
 950        { "nc_code_bytes" },
 951        { "nc_recode" },
 952        { "nc_recode_bytes" },
 953        { "nc_buffer" },
 954        { "nc_decode" },
 955        { "nc_decode_bytes" },
 956        { "nc_decode_failed" },
 957        { "nc_sniffed" },
 958#endif
 959};
 960
 961static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 962{
 963        if (stringset == ETH_SS_STATS)
 964                memcpy(data, batadv_counters_strings,
 965                       sizeof(batadv_counters_strings));
 966}
 967
 968static void batadv_get_ethtool_stats(struct net_device *dev,
 969                                     struct ethtool_stats *stats, u64 *data)
 970{
 971        struct batadv_priv *bat_priv = netdev_priv(dev);
 972        int i;
 973
 974        for (i = 0; i < BATADV_CNT_NUM; i++)
 975                data[i] = batadv_sum_counter(bat_priv, i);
 976}
 977
 978static int batadv_get_sset_count(struct net_device *dev, int stringset)
 979{
 980        if (stringset == ETH_SS_STATS)
 981                return BATADV_CNT_NUM;
 982
 983        return -EOPNOTSUPP;
 984}
 985
 986static const struct ethtool_ops batadv_ethtool_ops = {
 987        .get_drvinfo = batadv_get_drvinfo,
 988        .get_link = ethtool_op_get_link,
 989        .get_strings = batadv_get_strings,
 990        .get_ethtool_stats = batadv_get_ethtool_stats,
 991        .get_sset_count = batadv_get_sset_count,
 992};
 993
 994/**
 995 * batadv_softif_free() - Deconstructor of batadv_soft_interface
 996 * @dev: Device to cleanup and remove
 997 */
 998static void batadv_softif_free(struct net_device *dev)
 999{
1000        batadv_mesh_free(dev);
1001
1002        /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1003         * their tasks. Wait for them all to be finished before freeing the
1004         * netdev and its private data (bat_priv)
1005         */
1006        rcu_barrier();
1007}
1008
1009/**
1010 * batadv_softif_init_early() - early stage initialization of soft interface
1011 * @dev: registered network device to modify
1012 */
1013static void batadv_softif_init_early(struct net_device *dev)
1014{
1015        ether_setup(dev);
1016
1017        dev->netdev_ops = &batadv_netdev_ops;
1018        dev->needs_free_netdev = true;
1019        dev->priv_destructor = batadv_softif_free;
1020        dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1021        dev->features |= NETIF_F_LLTX;
1022        dev->priv_flags |= IFF_NO_QUEUE;
1023
1024        /* can't call min_mtu, because the needed variables
1025         * have not been initialized yet
1026         */
1027        dev->mtu = ETH_DATA_LEN;
1028
1029        /* generate random address */
1030        eth_hw_addr_random(dev);
1031
1032        dev->ethtool_ops = &batadv_ethtool_ops;
1033}
1034
1035/**
1036 * batadv_softif_validate() - validate configuration of new batadv link
1037 * @tb: IFLA_INFO_DATA netlink attributes
1038 * @data: enum batadv_ifla_attrs attributes
1039 * @extack: extended ACK report struct
1040 *
1041 * Return: 0 if successful or error otherwise.
1042 */
1043static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[],
1044                                  struct netlink_ext_ack *extack)
1045{
1046        struct batadv_algo_ops *algo_ops;
1047
1048        if (!data)
1049                return 0;
1050
1051        if (data[IFLA_BATADV_ALGO_NAME]) {
1052                algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME]));
1053                if (!algo_ops)
1054                        return -EINVAL;
1055        }
1056
1057        return 0;
1058}
1059
1060/**
1061 * batadv_softif_newlink() - pre-initialize and register new batadv link
1062 * @src_net: the applicable net namespace
1063 * @dev: network device to register
1064 * @tb: IFLA_INFO_DATA netlink attributes
1065 * @data: enum batadv_ifla_attrs attributes
1066 * @extack: extended ACK report struct
1067 *
1068 * Return: 0 if successful or error otherwise.
1069 */
1070static int batadv_softif_newlink(struct net *src_net, struct net_device *dev,
1071                                 struct nlattr *tb[], struct nlattr *data[],
1072                                 struct netlink_ext_ack *extack)
1073{
1074        struct batadv_priv *bat_priv = netdev_priv(dev);
1075        const char *algo_name;
1076        int err;
1077
1078        if (data && data[IFLA_BATADV_ALGO_NAME]) {
1079                algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]);
1080                err = batadv_algo_select(bat_priv, algo_name);
1081                if (err)
1082                        return -EINVAL;
1083        }
1084
1085        return register_netdevice(dev);
1086}
1087
1088/**
1089 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1090 *  netlink
1091 * @soft_iface: the to-be-removed batman-adv interface
1092 * @head: list pointer
1093 */
1094static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1095                                          struct list_head *head)
1096{
1097        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1098        struct batadv_hard_iface *hard_iface;
1099        struct batadv_softif_vlan *vlan;
1100
1101        list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1102                if (hard_iface->soft_iface == soft_iface)
1103                        batadv_hardif_disable_interface(hard_iface);
1104        }
1105
1106        /* destroy the "untagged" VLAN */
1107        vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1108        if (vlan) {
1109                batadv_softif_destroy_vlan(bat_priv, vlan);
1110                batadv_softif_vlan_put(vlan);
1111        }
1112
1113        unregister_netdevice_queue(soft_iface, head);
1114}
1115
1116/**
1117 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1118 * @net_dev: device which should be checked
1119 *
1120 * Return: true when net_dev is a batman-adv interface, false otherwise
1121 */
1122bool batadv_softif_is_valid(const struct net_device *net_dev)
1123{
1124        if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1125                return true;
1126
1127        return false;
1128}
1129
1130static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1131        [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1132};
1133
1134struct rtnl_link_ops batadv_link_ops __read_mostly = {
1135        .kind           = "batadv",
1136        .priv_size      = sizeof(struct batadv_priv),
1137        .setup          = batadv_softif_init_early,
1138        .maxtype        = IFLA_BATADV_MAX,
1139        .policy         = batadv_ifla_policy,
1140        .validate       = batadv_softif_validate,
1141        .newlink        = batadv_softif_newlink,
1142        .dellink        = batadv_softif_destroy_netlink,
1143};
1144