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/printk.h>
  30#include <linux/random.h>
  31#include <linux/rculist.h>
  32#include <linux/rcupdate.h>
  33#include <linux/skbuff.h>
  34#include <linux/slab.h>
  35#include <linux/socket.h>
  36#include <linux/spinlock.h>
  37#include <linux/stddef.h>
  38#include <linux/string.h>
  39#include <linux/types.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 = 1;
 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;
 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_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
 350
 351                /* a copy is stored in the bcast list, therefore removing
 352                 * the original skb.
 353                 */
 354                consume_skb(skb);
 355
 356        /* unicast packet */
 357        } else {
 358                /* DHCP packets going to a server will use the GW feature */
 359                if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
 360                        ret = batadv_gw_out_of_range(bat_priv, skb);
 361                        if (ret)
 362                                goto dropped;
 363                        ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 364                } else if (mcast_single_orig) {
 365                        ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
 366                                                          mcast_single_orig);
 367                } else if (forw_mode == BATADV_FORW_SOME) {
 368                        ret = batadv_mcast_forw_send(bat_priv, skb, vid);
 369                } else {
 370                        if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 371                                                                  skb))
 372                                goto dropped;
 373
 374                        batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 375
 376                        ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 377                                                     vid);
 378                }
 379                if (ret != NET_XMIT_SUCCESS)
 380                        goto dropped_freed;
 381        }
 382
 383        batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 384        batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 385        goto end;
 386
 387dropped:
 388        kfree_skb(skb);
 389dropped_freed:
 390        batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 391end:
 392        if (mcast_single_orig)
 393                batadv_orig_node_put(mcast_single_orig);
 394        if (primary_if)
 395                batadv_hardif_put(primary_if);
 396        return NETDEV_TX_OK;
 397}
 398
 399/**
 400 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
 401 * @soft_iface: local interface which will receive the ethernet frame
 402 * @skb: ethernet frame for @soft_iface
 403 * @hdr_size: size of already parsed batman-adv header
 404 * @orig_node: originator from which the batman-adv packet was sent
 405 *
 406 * Sends an ethernet frame to the receive path of the local @soft_iface.
 407 * skb->data has still point to the batman-adv header with the size @hdr_size.
 408 * The caller has to have parsed this header already and made sure that at least
 409 * @hdr_size bytes are still available for pull in @skb.
 410 *
 411 * The packet may still get dropped. This can happen when the encapsulated
 412 * ethernet frame is invalid or contains again an batman-adv packet. Also
 413 * unicast packets will be dropped directly when it was sent between two
 414 * isolated clients.
 415 */
 416void batadv_interface_rx(struct net_device *soft_iface,
 417                         struct sk_buff *skb, int hdr_size,
 418                         struct batadv_orig_node *orig_node)
 419{
 420        struct batadv_bcast_packet *batadv_bcast_packet;
 421        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 422        struct vlan_ethhdr *vhdr;
 423        struct ethhdr *ethhdr;
 424        unsigned short vid;
 425        int packet_type;
 426
 427        batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 428        packet_type = batadv_bcast_packet->packet_type;
 429
 430        skb_pull_rcsum(skb, hdr_size);
 431        skb_reset_mac_header(skb);
 432
 433        /* clean the netfilter state now that the batman-adv header has been
 434         * removed
 435         */
 436        nf_reset_ct(skb);
 437
 438        if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 439                goto dropped;
 440
 441        vid = batadv_get_vid(skb, 0);
 442        ethhdr = eth_hdr(skb);
 443
 444        switch (ntohs(ethhdr->h_proto)) {
 445        case ETH_P_8021Q:
 446                if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
 447                        goto dropped;
 448
 449                vhdr = (struct vlan_ethhdr *)skb->data;
 450
 451                /* drop batman-in-batman packets to prevent loops */
 452                if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 453                        break;
 454
 455                fallthrough;
 456        case ETH_P_BATMAN:
 457                goto dropped;
 458        }
 459
 460        /* skb->dev & skb->pkt_type are set here */
 461        skb->protocol = eth_type_trans(skb, soft_iface);
 462        skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 463
 464        batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 465        batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 466                           skb->len + ETH_HLEN);
 467
 468        /* Let the bridge loop avoidance check the packet. If will
 469         * not handle it, we can safely push it up.
 470         */
 471        if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
 472                goto out;
 473
 474        if (orig_node)
 475                batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 476                                                     ethhdr->h_source, vid);
 477
 478        if (is_multicast_ether_addr(ethhdr->h_dest)) {
 479                /* set the mark on broadcast packets if AP isolation is ON and
 480                 * the packet is coming from an "isolated" client
 481                 */
 482                if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 483                    batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 484                                                 vid)) {
 485                        /* save bits in skb->mark not covered by the mask and
 486                         * apply the mark on the rest
 487                         */
 488                        skb->mark &= ~bat_priv->isolation_mark_mask;
 489                        skb->mark |= bat_priv->isolation_mark;
 490                }
 491        } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 492                                         ethhdr->h_dest, vid)) {
 493                goto dropped;
 494        }
 495
 496        netif_rx(skb);
 497        goto out;
 498
 499dropped:
 500        kfree_skb(skb);
 501out:
 502        return;
 503}
 504
 505/**
 506 * batadv_softif_vlan_release() - release vlan from lists and queue for free
 507 *  after rcu grace period
 508 * @ref: kref pointer of the vlan object
 509 */
 510static void batadv_softif_vlan_release(struct kref *ref)
 511{
 512        struct batadv_softif_vlan *vlan;
 513
 514        vlan = container_of(ref, struct batadv_softif_vlan, refcount);
 515
 516        spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 517        hlist_del_rcu(&vlan->list);
 518        spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 519
 520        kfree_rcu(vlan, rcu);
 521}
 522
 523/**
 524 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
 525 *  possibly release it
 526 * @vlan: the vlan object to release
 527 */
 528void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
 529{
 530        if (!vlan)
 531                return;
 532
 533        kref_put(&vlan->refcount, batadv_softif_vlan_release);
 534}
 535
 536/**
 537 * batadv_softif_vlan_get() - get the vlan object for a specific vid
 538 * @bat_priv: the bat priv with all the soft interface information
 539 * @vid: the identifier of the vlan object to retrieve
 540 *
 541 * Return: the private data of the vlan matching the vid passed as argument or
 542 * NULL otherwise. The refcounter of the returned object is incremented by 1.
 543 */
 544struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 545                                                  unsigned short vid)
 546{
 547        struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 548
 549        rcu_read_lock();
 550        hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 551                if (vlan_tmp->vid != vid)
 552                        continue;
 553
 554                if (!kref_get_unless_zero(&vlan_tmp->refcount))
 555                        continue;
 556
 557                vlan = vlan_tmp;
 558                break;
 559        }
 560        rcu_read_unlock();
 561
 562        return vlan;
 563}
 564
 565/**
 566 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
 567 * @bat_priv: the bat priv with all the soft interface information
 568 * @vid: the VLAN identifier
 569 *
 570 * Return: 0 on success, a negative error otherwise.
 571 */
 572int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 573{
 574        struct batadv_softif_vlan *vlan;
 575
 576        spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 577
 578        vlan = batadv_softif_vlan_get(bat_priv, vid);
 579        if (vlan) {
 580                batadv_softif_vlan_put(vlan);
 581                spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 582                return -EEXIST;
 583        }
 584
 585        vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 586        if (!vlan) {
 587                spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 588                return -ENOMEM;
 589        }
 590
 591        vlan->bat_priv = bat_priv;
 592        vlan->vid = vid;
 593        kref_init(&vlan->refcount);
 594
 595        atomic_set(&vlan->ap_isolation, 0);
 596
 597        kref_get(&vlan->refcount);
 598        hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 599        spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 600
 601        /* add a new TT local entry. This one will be marked with the NOPURGE
 602         * flag
 603         */
 604        batadv_tt_local_add(bat_priv->soft_iface,
 605                            bat_priv->soft_iface->dev_addr, vid,
 606                            BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 607
 608        /* don't return reference to new softif_vlan */
 609        batadv_softif_vlan_put(vlan);
 610
 611        return 0;
 612}
 613
 614/**
 615 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
 616 * @bat_priv: the bat priv with all the soft interface information
 617 * @vlan: the object to remove
 618 */
 619static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 620                                       struct batadv_softif_vlan *vlan)
 621{
 622        /* explicitly remove the associated TT local entry because it is marked
 623         * with the NOPURGE flag
 624         */
 625        batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 626                               vlan->vid, "vlan interface destroyed", false);
 627
 628        batadv_softif_vlan_put(vlan);
 629}
 630
 631/**
 632 * batadv_interface_add_vid() - ndo_add_vid API implementation
 633 * @dev: the netdev of the mesh interface
 634 * @proto: protocol of the vlan id
 635 * @vid: identifier of the new vlan
 636 *
 637 * Set up all the internal structures for handling the new vlan on top of the
 638 * mesh interface
 639 *
 640 * Return: 0 on success or a negative error code in case of failure.
 641 */
 642static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 643                                    unsigned short vid)
 644{
 645        struct batadv_priv *bat_priv = netdev_priv(dev);
 646        struct batadv_softif_vlan *vlan;
 647
 648        /* only 802.1Q vlans are supported.
 649         * batman-adv does not know how to handle other types
 650         */
 651        if (proto != htons(ETH_P_8021Q))
 652                return -EINVAL;
 653
 654        vid |= BATADV_VLAN_HAS_TAG;
 655
 656        /* if a new vlan is getting created and it already exists, it means that
 657         * it was not deleted yet. batadv_softif_vlan_get() increases the
 658         * refcount in order to revive the object.
 659         *
 660         * if it does not exist then create it.
 661         */
 662        vlan = batadv_softif_vlan_get(bat_priv, vid);
 663        if (!vlan)
 664                return batadv_softif_create_vlan(bat_priv, vid);
 665
 666        /* add a new TT local entry. This one will be marked with the NOPURGE
 667         * flag. This must be added again, even if the vlan object already
 668         * exists, because the entry was deleted by kill_vid()
 669         */
 670        batadv_tt_local_add(bat_priv->soft_iface,
 671                            bat_priv->soft_iface->dev_addr, vid,
 672                            BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 673
 674        return 0;
 675}
 676
 677/**
 678 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
 679 * @dev: the netdev of the mesh interface
 680 * @proto: protocol of the vlan id
 681 * @vid: identifier of the deleted vlan
 682 *
 683 * Destroy all the internal structures used to handle the vlan identified by vid
 684 * on top of the mesh interface
 685 *
 686 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 687 * or -ENOENT if the specified vlan id wasn't registered.
 688 */
 689static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 690                                     unsigned short vid)
 691{
 692        struct batadv_priv *bat_priv = netdev_priv(dev);
 693        struct batadv_softif_vlan *vlan;
 694
 695        /* only 802.1Q vlans are supported. batman-adv does not know how to
 696         * handle other types
 697         */
 698        if (proto != htons(ETH_P_8021Q))
 699                return -EINVAL;
 700
 701        vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 702        if (!vlan)
 703                return -ENOENT;
 704
 705        batadv_softif_destroy_vlan(bat_priv, vlan);
 706
 707        /* finally free the vlan object */
 708        batadv_softif_vlan_put(vlan);
 709
 710        return 0;
 711}
 712
 713/* batman-adv network devices have devices nesting below it and are a special
 714 * "super class" of normal network devices; split their locks off into a
 715 * separate class since they always nest.
 716 */
 717static struct lock_class_key batadv_netdev_xmit_lock_key;
 718static struct lock_class_key batadv_netdev_addr_lock_key;
 719
 720/**
 721 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
 722 * @dev: device which owns the tx queue
 723 * @txq: tx queue to modify
 724 * @_unused: always NULL
 725 */
 726static void batadv_set_lockdep_class_one(struct net_device *dev,
 727                                         struct netdev_queue *txq,
 728                                         void *_unused)
 729{
 730        lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
 731}
 732
 733/**
 734 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
 735 * @dev: network device to modify
 736 */
 737static void batadv_set_lockdep_class(struct net_device *dev)
 738{
 739        lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
 740        netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
 741}
 742
 743/**
 744 * batadv_softif_init_late() - late stage initialization of soft interface
 745 * @dev: registered network device to modify
 746 *
 747 * Return: error code on failures
 748 */
 749static int batadv_softif_init_late(struct net_device *dev)
 750{
 751        struct batadv_priv *bat_priv;
 752        u32 random_seqno;
 753        int ret;
 754        size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
 755
 756        batadv_set_lockdep_class(dev);
 757
 758        bat_priv = netdev_priv(dev);
 759        bat_priv->soft_iface = dev;
 760
 761        /* batadv_interface_stats() needs to be available as soon as
 762         * register_netdevice() has been called
 763         */
 764        bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
 765        if (!bat_priv->bat_counters)
 766                return -ENOMEM;
 767
 768        atomic_set(&bat_priv->aggregated_ogms, 1);
 769        atomic_set(&bat_priv->bonding, 0);
 770#ifdef CONFIG_BATMAN_ADV_BLA
 771        atomic_set(&bat_priv->bridge_loop_avoidance, 1);
 772#endif
 773#ifdef CONFIG_BATMAN_ADV_DAT
 774        atomic_set(&bat_priv->distributed_arp_table, 1);
 775#endif
 776#ifdef CONFIG_BATMAN_ADV_MCAST
 777        atomic_set(&bat_priv->multicast_mode, 1);
 778        atomic_set(&bat_priv->multicast_fanout, 16);
 779        atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 780        atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 781        atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 782#endif
 783        atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
 784        atomic_set(&bat_priv->gw.bandwidth_down, 100);
 785        atomic_set(&bat_priv->gw.bandwidth_up, 20);
 786        atomic_set(&bat_priv->orig_interval, 1000);
 787        atomic_set(&bat_priv->hop_penalty, 30);
 788#ifdef CONFIG_BATMAN_ADV_DEBUG
 789        atomic_set(&bat_priv->log_level, 0);
 790#endif
 791        atomic_set(&bat_priv->fragmentation, 1);
 792        atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 793        atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 794        atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 795
 796        atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 797        atomic_set(&bat_priv->bcast_seqno, 1);
 798        atomic_set(&bat_priv->tt.vn, 0);
 799        atomic_set(&bat_priv->tt.local_changes, 0);
 800        atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 801#ifdef CONFIG_BATMAN_ADV_BLA
 802        atomic_set(&bat_priv->bla.num_requests, 0);
 803#endif
 804        atomic_set(&bat_priv->tp_num, 0);
 805
 806        bat_priv->tt.last_changeset = NULL;
 807        bat_priv->tt.last_changeset_len = 0;
 808        bat_priv->isolation_mark = 0;
 809        bat_priv->isolation_mark_mask = 0;
 810
 811        /* randomize initial seqno to avoid collision */
 812        get_random_bytes(&random_seqno, sizeof(random_seqno));
 813        atomic_set(&bat_priv->frag_seqno, random_seqno);
 814
 815        bat_priv->primary_if = NULL;
 816
 817        batadv_nc_init_bat_priv(bat_priv);
 818
 819        if (!bat_priv->algo_ops) {
 820                ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 821                if (ret < 0)
 822                        goto free_bat_counters;
 823        }
 824
 825        ret = batadv_mesh_init(dev);
 826        if (ret < 0)
 827                goto free_bat_counters;
 828
 829        return 0;
 830
 831free_bat_counters:
 832        free_percpu(bat_priv->bat_counters);
 833        bat_priv->bat_counters = NULL;
 834
 835        return ret;
 836}
 837
 838/**
 839 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
 840 * @dev: batadv_soft_interface used as master interface
 841 * @slave_dev: net_device which should become the slave interface
 842 * @extack: extended ACK report struct
 843 *
 844 * Return: 0 if successful or error otherwise.
 845 */
 846static int batadv_softif_slave_add(struct net_device *dev,
 847                                   struct net_device *slave_dev,
 848                                   struct netlink_ext_ack *extack)
 849{
 850        struct batadv_hard_iface *hard_iface;
 851        struct net *net = dev_net(dev);
 852        int ret = -EINVAL;
 853
 854        hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 855        if (!hard_iface || hard_iface->soft_iface)
 856                goto out;
 857
 858        ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
 859
 860out:
 861        if (hard_iface)
 862                batadv_hardif_put(hard_iface);
 863        return ret;
 864}
 865
 866/**
 867 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
 868 * @dev: batadv_soft_interface used as master interface
 869 * @slave_dev: net_device which should be removed from the master interface
 870 *
 871 * Return: 0 if successful or error otherwise.
 872 */
 873static int batadv_softif_slave_del(struct net_device *dev,
 874                                   struct net_device *slave_dev)
 875{
 876        struct batadv_hard_iface *hard_iface;
 877        int ret = -EINVAL;
 878
 879        hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 880
 881        if (!hard_iface || hard_iface->soft_iface != dev)
 882                goto out;
 883
 884        batadv_hardif_disable_interface(hard_iface);
 885        ret = 0;
 886
 887out:
 888        if (hard_iface)
 889                batadv_hardif_put(hard_iface);
 890        return ret;
 891}
 892
 893static const struct net_device_ops batadv_netdev_ops = {
 894        .ndo_init = batadv_softif_init_late,
 895        .ndo_open = batadv_interface_open,
 896        .ndo_stop = batadv_interface_release,
 897        .ndo_get_stats = batadv_interface_stats,
 898        .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 899        .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 900        .ndo_set_mac_address = batadv_interface_set_mac_addr,
 901        .ndo_change_mtu = batadv_interface_change_mtu,
 902        .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 903        .ndo_start_xmit = batadv_interface_tx,
 904        .ndo_validate_addr = eth_validate_addr,
 905        .ndo_add_slave = batadv_softif_slave_add,
 906        .ndo_del_slave = batadv_softif_slave_del,
 907};
 908
 909static void batadv_get_drvinfo(struct net_device *dev,
 910                               struct ethtool_drvinfo *info)
 911{
 912        strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 913        strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 914        strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 915        strscpy(info->bus_info, "batman", sizeof(info->bus_info));
 916}
 917
 918/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 919 * Declare each description string in struct.name[] to get fixed sized buffer
 920 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 921 */
 922static const struct {
 923        const char name[ETH_GSTRING_LEN];
 924} batadv_counters_strings[] = {
 925        { "tx" },
 926        { "tx_bytes" },
 927        { "tx_dropped" },
 928        { "rx" },
 929        { "rx_bytes" },
 930        { "forward" },
 931        { "forward_bytes" },
 932        { "mgmt_tx" },
 933        { "mgmt_tx_bytes" },
 934        { "mgmt_rx" },
 935        { "mgmt_rx_bytes" },
 936        { "frag_tx" },
 937        { "frag_tx_bytes" },
 938        { "frag_rx" },
 939        { "frag_rx_bytes" },
 940        { "frag_fwd" },
 941        { "frag_fwd_bytes" },
 942        { "tt_request_tx" },
 943        { "tt_request_rx" },
 944        { "tt_response_tx" },
 945        { "tt_response_rx" },
 946        { "tt_roam_adv_tx" },
 947        { "tt_roam_adv_rx" },
 948#ifdef CONFIG_BATMAN_ADV_DAT
 949        { "dat_get_tx" },
 950        { "dat_get_rx" },
 951        { "dat_put_tx" },
 952        { "dat_put_rx" },
 953        { "dat_cached_reply_tx" },
 954#endif
 955#ifdef CONFIG_BATMAN_ADV_NC
 956        { "nc_code" },
 957        { "nc_code_bytes" },
 958        { "nc_recode" },
 959        { "nc_recode_bytes" },
 960        { "nc_buffer" },
 961        { "nc_decode" },
 962        { "nc_decode_bytes" },
 963        { "nc_decode_failed" },
 964        { "nc_sniffed" },
 965#endif
 966};
 967
 968static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 969{
 970        if (stringset == ETH_SS_STATS)
 971                memcpy(data, batadv_counters_strings,
 972                       sizeof(batadv_counters_strings));
 973}
 974
 975static void batadv_get_ethtool_stats(struct net_device *dev,
 976                                     struct ethtool_stats *stats, u64 *data)
 977{
 978        struct batadv_priv *bat_priv = netdev_priv(dev);
 979        int i;
 980
 981        for (i = 0; i < BATADV_CNT_NUM; i++)
 982                data[i] = batadv_sum_counter(bat_priv, i);
 983}
 984
 985static int batadv_get_sset_count(struct net_device *dev, int stringset)
 986{
 987        if (stringset == ETH_SS_STATS)
 988                return BATADV_CNT_NUM;
 989
 990        return -EOPNOTSUPP;
 991}
 992
 993static const struct ethtool_ops batadv_ethtool_ops = {
 994        .get_drvinfo = batadv_get_drvinfo,
 995        .get_link = ethtool_op_get_link,
 996        .get_strings = batadv_get_strings,
 997        .get_ethtool_stats = batadv_get_ethtool_stats,
 998        .get_sset_count = batadv_get_sset_count,
 999};
1000
1001/**
1002 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1003 * @dev: Device to cleanup and remove
1004 */
1005static void batadv_softif_free(struct net_device *dev)
1006{
1007        batadv_mesh_free(dev);
1008
1009        /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1010         * their tasks. Wait for them all to be finished before freeing the
1011         * netdev and its private data (bat_priv)
1012         */
1013        rcu_barrier();
1014}
1015
1016/**
1017 * batadv_softif_init_early() - early stage initialization of soft interface
1018 * @dev: registered network device to modify
1019 */
1020static void batadv_softif_init_early(struct net_device *dev)
1021{
1022        ether_setup(dev);
1023
1024        dev->netdev_ops = &batadv_netdev_ops;
1025        dev->needs_free_netdev = true;
1026        dev->priv_destructor = batadv_softif_free;
1027        dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1028        dev->features |= NETIF_F_LLTX;
1029        dev->priv_flags |= IFF_NO_QUEUE;
1030
1031        /* can't call min_mtu, because the needed variables
1032         * have not been initialized yet
1033         */
1034        dev->mtu = ETH_DATA_LEN;
1035
1036        /* generate random address */
1037        eth_hw_addr_random(dev);
1038
1039        dev->ethtool_ops = &batadv_ethtool_ops;
1040}
1041
1042/**
1043 * batadv_softif_validate() - validate configuration of new batadv link
1044 * @tb: IFLA_INFO_DATA netlink attributes
1045 * @data: enum batadv_ifla_attrs attributes
1046 * @extack: extended ACK report struct
1047 *
1048 * Return: 0 if successful or error otherwise.
1049 */
1050static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[],
1051                                  struct netlink_ext_ack *extack)
1052{
1053        struct batadv_algo_ops *algo_ops;
1054
1055        if (!data)
1056                return 0;
1057
1058        if (data[IFLA_BATADV_ALGO_NAME]) {
1059                algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME]));
1060                if (!algo_ops)
1061                        return -EINVAL;
1062        }
1063
1064        return 0;
1065}
1066
1067/**
1068 * batadv_softif_newlink() - pre-initialize and register new batadv link
1069 * @src_net: the applicable net namespace
1070 * @dev: network device to register
1071 * @tb: IFLA_INFO_DATA netlink attributes
1072 * @data: enum batadv_ifla_attrs attributes
1073 * @extack: extended ACK report struct
1074 *
1075 * Return: 0 if successful or error otherwise.
1076 */
1077static int batadv_softif_newlink(struct net *src_net, struct net_device *dev,
1078                                 struct nlattr *tb[], struct nlattr *data[],
1079                                 struct netlink_ext_ack *extack)
1080{
1081        struct batadv_priv *bat_priv = netdev_priv(dev);
1082        const char *algo_name;
1083        int err;
1084
1085        if (data && data[IFLA_BATADV_ALGO_NAME]) {
1086                algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]);
1087                err = batadv_algo_select(bat_priv, algo_name);
1088                if (err)
1089                        return -EINVAL;
1090        }
1091
1092        return register_netdevice(dev);
1093}
1094
1095/**
1096 * batadv_softif_create() - Create and register soft interface
1097 * @net: the applicable net namespace
1098 * @name: name of the new soft interface
1099 *
1100 * Return: newly allocated soft_interface, NULL on errors
1101 */
1102struct net_device *batadv_softif_create(struct net *net, const char *name)
1103{
1104        struct net_device *soft_iface;
1105        int ret;
1106
1107        soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1108                                  NET_NAME_UNKNOWN, batadv_softif_init_early);
1109        if (!soft_iface)
1110                return NULL;
1111
1112        dev_net_set(soft_iface, net);
1113
1114        soft_iface->rtnl_link_ops = &batadv_link_ops;
1115
1116        ret = register_netdevice(soft_iface);
1117        if (ret < 0) {
1118                pr_err("Unable to register the batman interface '%s': %i\n",
1119                       name, ret);
1120                free_netdev(soft_iface);
1121                return NULL;
1122        }
1123
1124        return soft_iface;
1125}
1126
1127/**
1128 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1129 *  netlink
1130 * @soft_iface: the to-be-removed batman-adv interface
1131 * @head: list pointer
1132 */
1133static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1134                                          struct list_head *head)
1135{
1136        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1137        struct batadv_hard_iface *hard_iface;
1138        struct batadv_softif_vlan *vlan;
1139
1140        list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1141                if (hard_iface->soft_iface == soft_iface)
1142                        batadv_hardif_disable_interface(hard_iface);
1143        }
1144
1145        /* destroy the "untagged" VLAN */
1146        vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1147        if (vlan) {
1148                batadv_softif_destroy_vlan(bat_priv, vlan);
1149                batadv_softif_vlan_put(vlan);
1150        }
1151
1152        unregister_netdevice_queue(soft_iface, head);
1153}
1154
1155/**
1156 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1157 * @net_dev: device which should be checked
1158 *
1159 * Return: true when net_dev is a batman-adv interface, false otherwise
1160 */
1161bool batadv_softif_is_valid(const struct net_device *net_dev)
1162{
1163        if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1164                return true;
1165
1166        return false;
1167}
1168
1169static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1170        [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1171};
1172
1173struct rtnl_link_ops batadv_link_ops __read_mostly = {
1174        .kind           = "batadv",
1175        .priv_size      = sizeof(struct batadv_priv),
1176        .setup          = batadv_softif_init_early,
1177        .maxtype        = IFLA_BATADV_MAX,
1178        .policy         = batadv_ifla_policy,
1179        .validate       = batadv_softif_validate,
1180        .newlink        = batadv_softif_newlink,
1181        .dellink        = batadv_softif_destroy_netlink,
1182};
1183