linux/net/batman-adv/multicast.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (C) B.A.T.M.A.N. contributors:
   3 *
   4 * Linus L\xC3\xBCssing
   5 */
   6
   7#include "multicast.h"
   8#include "main.h"
   9
  10#include <linux/atomic.h>
  11#include <linux/bitops.h>
  12#include <linux/bug.h>
  13#include <linux/byteorder/generic.h>
  14#include <linux/errno.h>
  15#include <linux/etherdevice.h>
  16#include <linux/gfp.h>
  17#include <linux/icmpv6.h>
  18#include <linux/if_bridge.h>
  19#include <linux/if_ether.h>
  20#include <linux/igmp.h>
  21#include <linux/in.h>
  22#include <linux/in6.h>
  23#include <linux/inetdevice.h>
  24#include <linux/ip.h>
  25#include <linux/ipv6.h>
  26#include <linux/jiffies.h>
  27#include <linux/kernel.h>
  28#include <linux/kref.h>
  29#include <linux/list.h>
  30#include <linux/lockdep.h>
  31#include <linux/netdevice.h>
  32#include <linux/netlink.h>
  33#include <linux/printk.h>
  34#include <linux/rculist.h>
  35#include <linux/rcupdate.h>
  36#include <linux/skbuff.h>
  37#include <linux/slab.h>
  38#include <linux/spinlock.h>
  39#include <linux/stddef.h>
  40#include <linux/string.h>
  41#include <linux/types.h>
  42#include <linux/workqueue.h>
  43#include <net/addrconf.h>
  44#include <net/genetlink.h>
  45#include <net/if_inet6.h>
  46#include <net/ip.h>
  47#include <net/ipv6.h>
  48#include <net/netlink.h>
  49#include <net/sock.h>
  50#include <uapi/linux/batadv_packet.h>
  51#include <uapi/linux/batman_adv.h>
  52
  53#include "bridge_loop_avoidance.h"
  54#include "hard-interface.h"
  55#include "hash.h"
  56#include "log.h"
  57#include "netlink.h"
  58#include "send.h"
  59#include "soft-interface.h"
  60#include "translation-table.h"
  61#include "tvlv.h"
  62
  63static void batadv_mcast_mla_update(struct work_struct *work);
  64
  65/**
  66 * batadv_mcast_start_timer() - schedule the multicast periodic worker
  67 * @bat_priv: the bat priv with all the soft interface information
  68 */
  69static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
  70{
  71        queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work,
  72                           msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
  73}
  74
  75/**
  76 * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists
  77 * @soft_iface: netdev struct of the mesh interface
  78 *
  79 * If the given soft interface has a bridge on top then the refcount
  80 * of the according net device is increased.
  81 *
  82 * Return: NULL if no such bridge exists. Otherwise the net device of the
  83 * bridge.
  84 */
  85static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
  86{
  87        struct net_device *upper = soft_iface;
  88
  89        rcu_read_lock();
  90        do {
  91                upper = netdev_master_upper_dev_get_rcu(upper);
  92        } while (upper && !(upper->priv_flags & IFF_EBRIDGE));
  93
  94        if (upper)
  95                dev_hold(upper);
  96        rcu_read_unlock();
  97
  98        return upper;
  99}
 100
 101/**
 102 * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from
 103 *  node for IPv4
 104 * @dev: the interface to check
 105 *
 106 * Checks the presence of an IPv4 multicast router on this node.
 107 *
 108 * Caller needs to hold rcu read lock.
 109 *
 110 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise.
 111 */
 112static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev)
 113{
 114        struct in_device *in_dev = __in_dev_get_rcu(dev);
 115
 116        if (in_dev && IN_DEV_MFORWARD(in_dev))
 117                return BATADV_NO_FLAGS;
 118        else
 119                return BATADV_MCAST_WANT_NO_RTR4;
 120}
 121
 122/**
 123 * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from
 124 *  node for IPv6
 125 * @dev: the interface to check
 126 *
 127 * Checks the presence of an IPv6 multicast router on this node.
 128 *
 129 * Caller needs to hold rcu read lock.
 130 *
 131 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise.
 132 */
 133#if IS_ENABLED(CONFIG_IPV6_MROUTE)
 134static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
 135{
 136        struct inet6_dev *in6_dev = __in6_dev_get(dev);
 137
 138        if (in6_dev && in6_dev->cnf.mc_forwarding)
 139                return BATADV_NO_FLAGS;
 140        else
 141                return BATADV_MCAST_WANT_NO_RTR6;
 142}
 143#else
 144static inline u8
 145batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
 146{
 147        return BATADV_MCAST_WANT_NO_RTR6;
 148}
 149#endif
 150
 151/**
 152 * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node
 153 * @bat_priv: the bat priv with all the soft interface information
 154 * @bridge: bridge interface on top of the soft_iface if present,
 155 *  otherwise pass NULL
 156 *
 157 * Checks the presence of IPv4 and IPv6 multicast routers on this
 158 * node.
 159 *
 160 * Return:
 161 *      BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
 162 *      BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
 163 *      BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
 164 *      The former two OR'd: no multicast router is present
 165 */
 166static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv,
 167                                                struct net_device *bridge)
 168{
 169        struct net_device *dev = bridge ? bridge : bat_priv->soft_iface;
 170        u8 flags = BATADV_NO_FLAGS;
 171
 172        rcu_read_lock();
 173
 174        flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev);
 175        flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev);
 176
 177        rcu_read_unlock();
 178
 179        return flags;
 180}
 181
 182/**
 183 * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge
 184 * @bat_priv: the bat priv with all the soft interface information
 185 * @bridge: bridge interface on top of the soft_iface if present,
 186 *  otherwise pass NULL
 187 *
 188 * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge.
 189 *
 190 * Return:
 191 *      BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
 192 *      BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
 193 *      BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
 194 *      The former two OR'd: no multicast router is present
 195 */
 196#if IS_ENABLED(CONFIG_IPV6)
 197static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
 198                                                struct net_device *bridge)
 199{
 200        struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
 201        struct net_device *dev = bat_priv->soft_iface;
 202        struct br_ip_list *br_ip_entry, *tmp;
 203        u8 flags = BATADV_MCAST_WANT_NO_RTR6;
 204        int ret;
 205
 206        if (!bridge)
 207                return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
 208
 209        /* TODO: ask the bridge if a multicast router is present (the bridge
 210         * is capable of performing proper RFC4286 multicast router
 211         * discovery) instead of searching for a ff02::2 listener here
 212         */
 213        ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
 214        if (ret < 0)
 215                return BATADV_NO_FLAGS;
 216
 217        list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
 218                /* the bridge snooping does not maintain IPv4 link-local
 219                 * addresses - therefore we won't find any IPv4 multicast router
 220                 * address here, only IPv6 ones
 221                 */
 222                if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
 223                    ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
 224                        flags &= ~BATADV_MCAST_WANT_NO_RTR6;
 225
 226                list_del(&br_ip_entry->list);
 227                kfree(br_ip_entry);
 228        }
 229
 230        return flags;
 231}
 232#else
 233static inline u8
 234batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
 235                                      struct net_device *bridge)
 236{
 237        if (bridge)
 238                return BATADV_NO_FLAGS;
 239        else
 240                return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
 241}
 242#endif
 243
 244/**
 245 * batadv_mcast_mla_rtr_flags_get() - get multicast router flags
 246 * @bat_priv: the bat priv with all the soft interface information
 247 * @bridge: bridge interface on top of the soft_iface if present,
 248 *  otherwise pass NULL
 249 *
 250 * Checks the presence of IPv4 and IPv6 multicast routers on this
 251 * node or behind its bridge.
 252 *
 253 * Return:
 254 *      BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
 255 *      BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
 256 *      BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
 257 *      The former two OR'd: no multicast router is present
 258 */
 259static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv,
 260                                         struct net_device *bridge)
 261{
 262        u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
 263
 264        flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge);
 265        flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge);
 266
 267        return flags;
 268}
 269
 270/**
 271 * batadv_mcast_mla_flags_get() - get the new multicast flags
 272 * @bat_priv: the bat priv with all the soft interface information
 273 *
 274 * Return: A set of flags for the current/next TVLV, querier and
 275 * bridge state.
 276 */
 277static struct batadv_mcast_mla_flags
 278batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv)
 279{
 280        struct net_device *dev = bat_priv->soft_iface;
 281        struct batadv_mcast_querier_state *qr4, *qr6;
 282        struct batadv_mcast_mla_flags mla_flags;
 283        struct net_device *bridge;
 284
 285        bridge = batadv_mcast_get_bridge(dev);
 286
 287        memset(&mla_flags, 0, sizeof(mla_flags));
 288        mla_flags.enabled = 1;
 289        mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv,
 290                                                               bridge);
 291
 292        if (!bridge)
 293                return mla_flags;
 294
 295        dev_put(bridge);
 296
 297        mla_flags.bridged = 1;
 298        qr4 = &mla_flags.querier_ipv4;
 299        qr6 = &mla_flags.querier_ipv6;
 300
 301        if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
 302                pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
 303
 304        qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
 305        qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
 306
 307        qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
 308        qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
 309
 310        mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
 311
 312        /* 1) If no querier exists at all, then multicast listeners on
 313         *    our local TT clients behind the bridge will keep silent.
 314         * 2) If the selected querier is on one of our local TT clients,
 315         *    behind the bridge, then this querier might shadow multicast
 316         *    listeners on our local TT clients, behind this bridge.
 317         *
 318         * In both cases, we will signalize other batman nodes that
 319         * we need all multicast traffic of the according protocol.
 320         */
 321        if (!qr4->exists || qr4->shadowing) {
 322                mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4;
 323                mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4;
 324        }
 325
 326        if (!qr6->exists || qr6->shadowing) {
 327                mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6;
 328                mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6;
 329        }
 330
 331        return mla_flags;
 332}
 333
 334/**
 335 * batadv_mcast_mla_is_duplicate() - check whether an address is in a list
 336 * @mcast_addr: the multicast address to check
 337 * @mcast_list: the list with multicast addresses to search in
 338 *
 339 * Return: true if the given address is already in the given list.
 340 * Otherwise returns false.
 341 */
 342static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
 343                                          struct hlist_head *mcast_list)
 344{
 345        struct batadv_hw_addr *mcast_entry;
 346
 347        hlist_for_each_entry(mcast_entry, mcast_list, list)
 348                if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
 349                        return true;
 350
 351        return false;
 352}
 353
 354/**
 355 * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners
 356 * @dev: the device to collect multicast addresses from
 357 * @mcast_list: a list to put found addresses into
 358 * @flags: flags indicating the new multicast state
 359 *
 360 * Collects multicast addresses of IPv4 multicast listeners residing
 361 * on this kernel on the given soft interface, dev, in
 362 * the given mcast_list. In general, multicast listeners provided by
 363 * your multicast receiving applications run directly on this node.
 364 *
 365 * Return: -ENOMEM on memory allocation error or the number of
 366 * items added to the mcast_list otherwise.
 367 */
 368static int
 369batadv_mcast_mla_softif_get_ipv4(struct net_device *dev,
 370                                 struct hlist_head *mcast_list,
 371                                 struct batadv_mcast_mla_flags *flags)
 372{
 373        struct batadv_hw_addr *new;
 374        struct in_device *in_dev;
 375        u8 mcast_addr[ETH_ALEN];
 376        struct ip_mc_list *pmc;
 377        int ret = 0;
 378
 379        if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
 380                return 0;
 381
 382        rcu_read_lock();
 383
 384        in_dev = __in_dev_get_rcu(dev);
 385        if (!in_dev) {
 386                rcu_read_unlock();
 387                return 0;
 388        }
 389
 390        for (pmc = rcu_dereference(in_dev->mc_list); pmc;
 391             pmc = rcu_dereference(pmc->next_rcu)) {
 392                if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
 393                    ipv4_is_local_multicast(pmc->multiaddr))
 394                        continue;
 395
 396                if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
 397                    !ipv4_is_local_multicast(pmc->multiaddr))
 398                        continue;
 399
 400                ip_eth_mc_map(pmc->multiaddr, mcast_addr);
 401
 402                if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
 403                        continue;
 404
 405                new = kmalloc(sizeof(*new), GFP_ATOMIC);
 406                if (!new) {
 407                        ret = -ENOMEM;
 408                        break;
 409                }
 410
 411                ether_addr_copy(new->addr, mcast_addr);
 412                hlist_add_head(&new->list, mcast_list);
 413                ret++;
 414        }
 415        rcu_read_unlock();
 416
 417        return ret;
 418}
 419
 420/**
 421 * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners
 422 * @dev: the device to collect multicast addresses from
 423 * @mcast_list: a list to put found addresses into
 424 * @flags: flags indicating the new multicast state
 425 *
 426 * Collects multicast addresses of IPv6 multicast listeners residing
 427 * on this kernel on the given soft interface, dev, in
 428 * the given mcast_list. In general, multicast listeners provided by
 429 * your multicast receiving applications run directly on this node.
 430 *
 431 * Return: -ENOMEM on memory allocation error or the number of
 432 * items added to the mcast_list otherwise.
 433 */
 434#if IS_ENABLED(CONFIG_IPV6)
 435static int
 436batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
 437                                 struct hlist_head *mcast_list,
 438                                 struct batadv_mcast_mla_flags *flags)
 439{
 440        struct batadv_hw_addr *new;
 441        struct inet6_dev *in6_dev;
 442        u8 mcast_addr[ETH_ALEN];
 443        struct ifmcaddr6 *pmc6;
 444        int ret = 0;
 445
 446        if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
 447                return 0;
 448
 449        rcu_read_lock();
 450
 451        in6_dev = __in6_dev_get(dev);
 452        if (!in6_dev) {
 453                rcu_read_unlock();
 454                return 0;
 455        }
 456
 457        for (pmc6 = rcu_dereference(in6_dev->mc_list);
 458             pmc6;
 459             pmc6 = rcu_dereference(pmc6->next)) {
 460                if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
 461                    IPV6_ADDR_SCOPE_LINKLOCAL)
 462                        continue;
 463
 464                if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
 465                    ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr))
 466                        continue;
 467
 468                if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
 469                    IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) >
 470                    IPV6_ADDR_SCOPE_LINKLOCAL)
 471                        continue;
 472
 473                ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr);
 474
 475                if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
 476                        continue;
 477
 478                new = kmalloc(sizeof(*new), GFP_ATOMIC);
 479                if (!new) {
 480                        ret = -ENOMEM;
 481                        break;
 482                }
 483
 484                ether_addr_copy(new->addr, mcast_addr);
 485                hlist_add_head(&new->list, mcast_list);
 486                ret++;
 487        }
 488        rcu_read_unlock();
 489
 490        return ret;
 491}
 492#else
 493static inline int
 494batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
 495                                 struct hlist_head *mcast_list,
 496                                 struct batadv_mcast_mla_flags *flags)
 497{
 498        return 0;
 499}
 500#endif
 501
 502/**
 503 * batadv_mcast_mla_softif_get() - get softif multicast listeners
 504 * @dev: the device to collect multicast addresses from
 505 * @mcast_list: a list to put found addresses into
 506 * @flags: flags indicating the new multicast state
 507 *
 508 * Collects multicast addresses of multicast listeners residing
 509 * on this kernel on the given soft interface, dev, in
 510 * the given mcast_list. In general, multicast listeners provided by
 511 * your multicast receiving applications run directly on this node.
 512 *
 513 * If there is a bridge interface on top of dev, collect from that one
 514 * instead. Just like with IP addresses and routes, multicast listeners
 515 * will(/should) register to the bridge interface instead of an
 516 * enslaved bat0.
 517 *
 518 * Return: -ENOMEM on memory allocation error or the number of
 519 * items added to the mcast_list otherwise.
 520 */
 521static int
 522batadv_mcast_mla_softif_get(struct net_device *dev,
 523                            struct hlist_head *mcast_list,
 524                            struct batadv_mcast_mla_flags *flags)
 525{
 526        struct net_device *bridge = batadv_mcast_get_bridge(dev);
 527        int ret4, ret6 = 0;
 528
 529        if (bridge)
 530                dev = bridge;
 531
 532        ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags);
 533        if (ret4 < 0)
 534                goto out;
 535
 536        ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags);
 537        if (ret6 < 0) {
 538                ret4 = 0;
 539                goto out;
 540        }
 541
 542out:
 543        if (bridge)
 544                dev_put(bridge);
 545
 546        return ret4 + ret6;
 547}
 548
 549/**
 550 * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address
 551 * @dst: destination to write to - a multicast MAC address
 552 * @src: source to read from - a multicast IP address
 553 *
 554 * Converts a given multicast IPv4/IPv6 address from a bridge
 555 * to its matching multicast MAC address and copies it into the given
 556 * destination buffer.
 557 *
 558 * Caller needs to make sure the destination buffer can hold
 559 * at least ETH_ALEN bytes.
 560 */
 561static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
 562{
 563        if (src->proto == htons(ETH_P_IP))
 564                ip_eth_mc_map(src->dst.ip4, dst);
 565#if IS_ENABLED(CONFIG_IPV6)
 566        else if (src->proto == htons(ETH_P_IPV6))
 567                ipv6_eth_mc_map(&src->dst.ip6, dst);
 568#endif
 569        else
 570                eth_zero_addr(dst);
 571}
 572
 573/**
 574 * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
 575 * @dev: a bridge slave whose bridge to collect multicast addresses from
 576 * @mcast_list: a list to put found addresses into
 577 * @flags: flags indicating the new multicast state
 578 *
 579 * Collects multicast addresses of multicast listeners residing
 580 * on foreign, non-mesh devices which we gave access to our mesh via
 581 * a bridge on top of the given soft interface, dev, in the given
 582 * mcast_list.
 583 *
 584 * Return: -ENOMEM on memory allocation error or the number of
 585 * items added to the mcast_list otherwise.
 586 */
 587static int batadv_mcast_mla_bridge_get(struct net_device *dev,
 588                                       struct hlist_head *mcast_list,
 589                                       struct batadv_mcast_mla_flags *flags)
 590{
 591        struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
 592        struct br_ip_list *br_ip_entry, *tmp;
 593        u8 tvlv_flags = flags->tvlv_flags;
 594        struct batadv_hw_addr *new;
 595        u8 mcast_addr[ETH_ALEN];
 596        int ret;
 597
 598        /* we don't need to detect these devices/listeners, the IGMP/MLD
 599         * snooping code of the Linux bridge already does that for us
 600         */
 601        ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
 602        if (ret < 0)
 603                goto out;
 604
 605        list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
 606                if (br_ip_entry->addr.proto == htons(ETH_P_IP)) {
 607                        if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
 608                                continue;
 609
 610                        if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
 611                            ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
 612                                continue;
 613
 614                        if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
 615                            !ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
 616                                continue;
 617                }
 618
 619#if IS_ENABLED(CONFIG_IPV6)
 620                if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) {
 621                        if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
 622                                continue;
 623
 624                        if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
 625                            ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.dst.ip6))
 626                                continue;
 627
 628                        if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
 629                            IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) >
 630                            IPV6_ADDR_SCOPE_LINKLOCAL)
 631                                continue;
 632                }
 633#endif
 634
 635                batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
 636                if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
 637                        continue;
 638
 639                new = kmalloc(sizeof(*new), GFP_ATOMIC);
 640                if (!new) {
 641                        ret = -ENOMEM;
 642                        break;
 643                }
 644
 645                ether_addr_copy(new->addr, mcast_addr);
 646                hlist_add_head(&new->list, mcast_list);
 647        }
 648
 649out:
 650        list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
 651                list_del(&br_ip_entry->list);
 652                kfree(br_ip_entry);
 653        }
 654
 655        return ret;
 656}
 657
 658/**
 659 * batadv_mcast_mla_list_free() - free a list of multicast addresses
 660 * @mcast_list: the list to free
 661 *
 662 * Removes and frees all items in the given mcast_list.
 663 */
 664static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
 665{
 666        struct batadv_hw_addr *mcast_entry;
 667        struct hlist_node *tmp;
 668
 669        hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
 670                hlist_del(&mcast_entry->list);
 671                kfree(mcast_entry);
 672        }
 673}
 674
 675/**
 676 * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements
 677 * @bat_priv: the bat priv with all the soft interface information
 678 * @mcast_list: a list of addresses which should _not_ be removed
 679 *
 680 * Retracts the announcement of any multicast listener from the
 681 * translation table except the ones listed in the given mcast_list.
 682 *
 683 * If mcast_list is NULL then all are retracted.
 684 */
 685static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
 686                                        struct hlist_head *mcast_list)
 687{
 688        struct batadv_hw_addr *mcast_entry;
 689        struct hlist_node *tmp;
 690
 691        hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
 692                                  list) {
 693                if (mcast_list &&
 694                    batadv_mcast_mla_is_duplicate(mcast_entry->addr,
 695                                                  mcast_list))
 696                        continue;
 697
 698                batadv_tt_local_remove(bat_priv, mcast_entry->addr,
 699                                       BATADV_NO_FLAGS,
 700                                       "mcast TT outdated", false);
 701
 702                hlist_del(&mcast_entry->list);
 703                kfree(mcast_entry);
 704        }
 705}
 706
 707/**
 708 * batadv_mcast_mla_tt_add() - add multicast listener announcements
 709 * @bat_priv: the bat priv with all the soft interface information
 710 * @mcast_list: a list of addresses which are going to get added
 711 *
 712 * Adds multicast listener announcements from the given mcast_list to the
 713 * translation table if they have not been added yet.
 714 */
 715static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
 716                                    struct hlist_head *mcast_list)
 717{
 718        struct batadv_hw_addr *mcast_entry;
 719        struct hlist_node *tmp;
 720
 721        if (!mcast_list)
 722                return;
 723
 724        hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
 725                if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
 726                                                  &bat_priv->mcast.mla_list))
 727                        continue;
 728
 729                if (!batadv_tt_local_add(bat_priv->soft_iface,
 730                                         mcast_entry->addr, BATADV_NO_FLAGS,
 731                                         BATADV_NULL_IFINDEX, BATADV_NO_MARK))
 732                        continue;
 733
 734                hlist_del(&mcast_entry->list);
 735                hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
 736        }
 737}
 738
 739/**
 740 * batadv_mcast_querier_log() - debug output regarding the querier status on
 741 *  link
 742 * @bat_priv: the bat priv with all the soft interface information
 743 * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
 744 * @old_state: the previous querier state on our link
 745 * @new_state: the new querier state on our link
 746 *
 747 * Outputs debug messages to the logging facility with log level 'mcast'
 748 * regarding changes to the querier status on the link which are relevant
 749 * to our multicast optimizations.
 750 *
 751 * Usually this is about whether a querier appeared or vanished in
 752 * our mesh or whether the querier is in the suboptimal position of being
 753 * behind our local bridge segment: Snooping switches will directly
 754 * forward listener reports to the querier, therefore batman-adv and
 755 * the bridge will potentially not see these listeners - the querier is
 756 * potentially shadowing listeners from us then.
 757 *
 758 * This is only interesting for nodes with a bridge on top of their
 759 * soft interface.
 760 */
 761static void
 762batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
 763                         struct batadv_mcast_querier_state *old_state,
 764                         struct batadv_mcast_querier_state *new_state)
 765{
 766        if (!old_state->exists && new_state->exists)
 767                batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
 768                            str_proto);
 769        else if (old_state->exists && !new_state->exists)
 770                batadv_info(bat_priv->soft_iface,
 771                            "%s Querier disappeared - multicast optimizations disabled\n",
 772                            str_proto);
 773        else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists)
 774                batadv_info(bat_priv->soft_iface,
 775                            "No %s Querier present - multicast optimizations disabled\n",
 776                            str_proto);
 777
 778        if (new_state->exists) {
 779                if ((!old_state->shadowing && new_state->shadowing) ||
 780                    (!old_state->exists && new_state->shadowing))
 781                        batadv_dbg(BATADV_DBG_MCAST, bat_priv,
 782                                   "%s Querier is behind our bridged segment: Might shadow listeners\n",
 783                                   str_proto);
 784                else if (old_state->shadowing && !new_state->shadowing)
 785                        batadv_dbg(BATADV_DBG_MCAST, bat_priv,
 786                                   "%s Querier is not behind our bridged segment\n",
 787                                   str_proto);
 788        }
 789}
 790
 791/**
 792 * batadv_mcast_bridge_log() - debug output for topology changes in bridged
 793 *  setups
 794 * @bat_priv: the bat priv with all the soft interface information
 795 * @new_flags: flags indicating the new multicast state
 796 *
 797 * If no bridges are ever used on this node, then this function does nothing.
 798 *
 799 * Otherwise this function outputs debug information to the 'mcast' log level
 800 * which might be relevant to our multicast optimizations.
 801 *
 802 * More precisely, it outputs information when a bridge interface is added or
 803 * removed from a soft interface. And when a bridge is present, it further
 804 * outputs information about the querier state which is relevant for the
 805 * multicast flags this node is going to set.
 806 */
 807static void
 808batadv_mcast_bridge_log(struct batadv_priv *bat_priv,
 809                        struct batadv_mcast_mla_flags *new_flags)
 810{
 811        struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags;
 812
 813        if (!old_flags->bridged && new_flags->bridged)
 814                batadv_dbg(BATADV_DBG_MCAST, bat_priv,
 815                           "Bridge added: Setting Unsnoopables(U)-flag\n");
 816        else if (old_flags->bridged && !new_flags->bridged)
 817                batadv_dbg(BATADV_DBG_MCAST, bat_priv,
 818                           "Bridge removed: Unsetting Unsnoopables(U)-flag\n");
 819
 820        if (new_flags->bridged) {
 821                batadv_mcast_querier_log(bat_priv, "IGMP",
 822                                         &old_flags->querier_ipv4,
 823                                         &new_flags->querier_ipv4);
 824                batadv_mcast_querier_log(bat_priv, "MLD",
 825                                         &old_flags->querier_ipv6,
 826                                         &new_flags->querier_ipv6);
 827        }
 828}
 829
 830/**
 831 * batadv_mcast_flags_log() - output debug information about mcast flag changes
 832 * @bat_priv: the bat priv with all the soft interface information
 833 * @flags: TVLV flags indicating the new multicast state
 834 *
 835 * Whenever the multicast TVLV flags this node announces change, this function
 836 * should be used to notify userspace about the change.
 837 */
 838static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
 839{
 840        bool old_enabled = bat_priv->mcast.mla_flags.enabled;
 841        u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags;
 842        char str_old_flags[] = "[.... . ]";
 843
 844        sprintf(str_old_flags, "[%c%c%c%s%s]",
 845                (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
 846                (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
 847                (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
 848                !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
 849                !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
 850
 851        batadv_dbg(BATADV_DBG_MCAST, bat_priv,
 852                   "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n",
 853                   old_enabled ? str_old_flags : "<undefined>",
 854                   (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
 855                   (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
 856                   (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
 857                   !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
 858                   !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
 859}
 860
 861/**
 862 * batadv_mcast_mla_flags_update() - update multicast flags
 863 * @bat_priv: the bat priv with all the soft interface information
 864 * @flags: flags indicating the new multicast state
 865 *
 866 * Updates the own multicast tvlv with our current multicast related settings,
 867 * capabilities and inabilities.
 868 */
 869static void
 870batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv,
 871                              struct batadv_mcast_mla_flags *flags)
 872{
 873        struct batadv_tvlv_mcast_data mcast_data;
 874
 875        if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags)))
 876                return;
 877
 878        batadv_mcast_bridge_log(bat_priv, flags);
 879        batadv_mcast_flags_log(bat_priv, flags->tvlv_flags);
 880
 881        mcast_data.flags = flags->tvlv_flags;
 882        memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
 883
 884        batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
 885                                       &mcast_data, sizeof(mcast_data));
 886
 887        bat_priv->mcast.mla_flags = *flags;
 888}
 889
 890/**
 891 * __batadv_mcast_mla_update() - update the own MLAs
 892 * @bat_priv: the bat priv with all the soft interface information
 893 *
 894 * Updates the own multicast listener announcements in the translation
 895 * table as well as the own, announced multicast tvlv container.
 896 *
 897 * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
 898 * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
 899 * ensured by the non-parallel execution of the worker this function
 900 * belongs to.
 901 */
 902static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
 903{
 904        struct net_device *soft_iface = bat_priv->soft_iface;
 905        struct hlist_head mcast_list = HLIST_HEAD_INIT;
 906        struct batadv_mcast_mla_flags flags;
 907        int ret;
 908
 909        flags = batadv_mcast_mla_flags_get(bat_priv);
 910
 911        ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags);
 912        if (ret < 0)
 913                goto out;
 914
 915        ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags);
 916        if (ret < 0)
 917                goto out;
 918
 919        spin_lock(&bat_priv->mcast.mla_lock);
 920        batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
 921        batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
 922        batadv_mcast_mla_flags_update(bat_priv, &flags);
 923        spin_unlock(&bat_priv->mcast.mla_lock);
 924
 925out:
 926        batadv_mcast_mla_list_free(&mcast_list);
 927}
 928
 929/**
 930 * batadv_mcast_mla_update() - update the own MLAs
 931 * @work: kernel work struct
 932 *
 933 * Updates the own multicast listener announcements in the translation
 934 * table as well as the own, announced multicast tvlv container.
 935 *
 936 * In the end, reschedules the work timer.
 937 */
 938static void batadv_mcast_mla_update(struct work_struct *work)
 939{
 940        struct delayed_work *delayed_work;
 941        struct batadv_priv_mcast *priv_mcast;
 942        struct batadv_priv *bat_priv;
 943
 944        delayed_work = to_delayed_work(work);
 945        priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
 946        bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
 947
 948        __batadv_mcast_mla_update(bat_priv);
 949        batadv_mcast_start_timer(bat_priv);
 950}
 951
 952/**
 953 * batadv_mcast_is_report_ipv4() -\xE2\x80\xAFcheck for IGMP reports
 954 * @skb: the ethernet frame destined for the mesh
 955 *
 956 * This call might reallocate skb data.
 957 *
 958 * Checks whether the given frame is a valid IGMP report.
 959 *
 960 * Return: If so then true, otherwise false.
 961 */
 962static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
 963{
 964        if (ip_mc_check_igmp(skb) < 0)
 965                return false;
 966
 967        switch (igmp_hdr(skb)->type) {
 968        case IGMP_HOST_MEMBERSHIP_REPORT:
 969        case IGMPV2_HOST_MEMBERSHIP_REPORT:
 970        case IGMPV3_HOST_MEMBERSHIP_REPORT:
 971                return true;
 972        }
 973
 974        return false;
 975}
 976
 977/**
 978 * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding
 979 *  potential
 980 * @bat_priv: the bat priv with all the soft interface information
 981 * @skb: the IPv4 packet to check
 982 * @is_unsnoopable: stores whether the destination is snoopable
 983 * @is_routable: stores whether the destination is routable
 984 *
 985 * Checks whether the given IPv4 packet has the potential to be forwarded with a
 986 * mode more optimal than classic flooding.
 987 *
 988 * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
 989 * allocation failure.
 990 */
 991static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
 992                                             struct sk_buff *skb,
 993                                             bool *is_unsnoopable,
 994                                             int *is_routable)
 995{
 996        struct iphdr *iphdr;
 997
 998        /* We might fail due to out-of-memory -> drop it */
 999        if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
1000                return -ENOMEM;
1001
1002        if (batadv_mcast_is_report_ipv4(skb))
1003                return -EINVAL;
1004
1005        iphdr = ip_hdr(skb);
1006
1007        /* link-local multicast listeners behind a bridge are
1008         * not snoopable (see RFC4541, section 2.1.2.2)
1009         */
1010        if (ipv4_is_local_multicast(iphdr->daddr))
1011                *is_unsnoopable = true;
1012        else
1013                *is_routable = ETH_P_IP;
1014
1015        return 0;
1016}
1017
1018/**
1019 * batadv_mcast_is_report_ipv6() - check for MLD reports
1020 * @skb: the ethernet frame destined for the mesh
1021 *
1022 * This call might reallocate skb data.
1023 *
1024 * Checks whether the given frame is a valid MLD report.
1025 *
1026 * Return: If so then true, otherwise false.
1027 */
1028static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
1029{
1030        if (ipv6_mc_check_mld(skb) < 0)
1031                return false;
1032
1033        switch (icmp6_hdr(skb)->icmp6_type) {
1034        case ICMPV6_MGM_REPORT:
1035        case ICMPV6_MLD2_REPORT:
1036                return true;
1037        }
1038
1039        return false;
1040}
1041
1042/**
1043 * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding
1044 *  potential
1045 * @bat_priv: the bat priv with all the soft interface information
1046 * @skb: the IPv6 packet to check
1047 * @is_unsnoopable: stores whether the destination is snoopable
1048 * @is_routable: stores whether the destination is routable
1049 *
1050 * Checks whether the given IPv6 packet has the potential to be forwarded with a
1051 * mode more optimal than classic flooding.
1052 *
1053 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1054 */
1055static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
1056                                             struct sk_buff *skb,
1057                                             bool *is_unsnoopable,
1058                                             int *is_routable)
1059{
1060        struct ipv6hdr *ip6hdr;
1061
1062        /* We might fail due to out-of-memory -> drop it */
1063        if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
1064                return -ENOMEM;
1065
1066        if (batadv_mcast_is_report_ipv6(skb))
1067                return -EINVAL;
1068
1069        ip6hdr = ipv6_hdr(skb);
1070
1071        if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1072                return -EINVAL;
1073
1074        /* link-local-all-nodes multicast listeners behind a bridge are
1075         * not snoopable (see RFC4541, section 3, paragraph 3)
1076         */
1077        if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
1078                *is_unsnoopable = true;
1079        else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL)
1080                *is_routable = ETH_P_IPV6;
1081
1082        return 0;
1083}
1084
1085/**
1086 * batadv_mcast_forw_mode_check() - check for optimized forwarding potential
1087 * @bat_priv: the bat priv with all the soft interface information
1088 * @skb: the multicast frame to check
1089 * @is_unsnoopable: stores whether the destination is snoopable
1090 * @is_routable: stores whether the destination is routable
1091 *
1092 * Checks whether the given multicast ethernet frame has the potential to be
1093 * forwarded with a mode more optimal than classic flooding.
1094 *
1095 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1096 */
1097static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
1098                                        struct sk_buff *skb,
1099                                        bool *is_unsnoopable,
1100                                        int *is_routable)
1101{
1102        struct ethhdr *ethhdr = eth_hdr(skb);
1103
1104        if (!atomic_read(&bat_priv->multicast_mode))
1105                return -EINVAL;
1106
1107        switch (ntohs(ethhdr->h_proto)) {
1108        case ETH_P_IP:
1109                return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
1110                                                         is_unsnoopable,
1111                                                         is_routable);
1112        case ETH_P_IPV6:
1113                if (!IS_ENABLED(CONFIG_IPV6))
1114                        return -EINVAL;
1115
1116                return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
1117                                                         is_unsnoopable,
1118                                                         is_routable);
1119        default:
1120                return -EINVAL;
1121        }
1122}
1123
1124/**
1125 * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast
1126 *  interest
1127 * @bat_priv: the bat priv with all the soft interface information
1128 * @ethhdr: ethernet header of a packet
1129 *
1130 * Return: the number of nodes which want all IPv4 multicast traffic if the
1131 * given ethhdr is from an IPv4 packet or the number of nodes which want all
1132 * IPv6 traffic if it matches an IPv6 packet.
1133 */
1134static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
1135                                               struct ethhdr *ethhdr)
1136{
1137        switch (ntohs(ethhdr->h_proto)) {
1138        case ETH_P_IP:
1139                return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
1140        case ETH_P_IPV6:
1141                return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
1142        default:
1143                /* we shouldn't be here... */
1144                return 0;
1145        }
1146}
1147
1148/**
1149 * batadv_mcast_forw_rtr_count() - count nodes with a multicast router
1150 * @bat_priv: the bat priv with all the soft interface information
1151 * @protocol: the ethernet protocol type to count multicast routers for
1152 *
1153 * Return: the number of nodes which want all routable IPv4 multicast traffic
1154 * if the protocol is ETH_P_IP or the number of nodes which want all routable
1155 * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0.
1156 */
1157
1158static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv,
1159                                       int protocol)
1160{
1161        switch (protocol) {
1162        case ETH_P_IP:
1163                return atomic_read(&bat_priv->mcast.num_want_all_rtr4);
1164        case ETH_P_IPV6:
1165                return atomic_read(&bat_priv->mcast.num_want_all_rtr6);
1166        default:
1167                return 0;
1168        }
1169}
1170
1171/**
1172 * batadv_mcast_forw_tt_node_get() - get a multicast tt node
1173 * @bat_priv: the bat priv with all the soft interface information
1174 * @ethhdr: the ether header containing the multicast destination
1175 *
1176 * Return: an orig_node matching the multicast address provided by ethhdr
1177 * via a translation table lookup. This increases the returned nodes refcount.
1178 */
1179static struct batadv_orig_node *
1180batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
1181                              struct ethhdr *ethhdr)
1182{
1183        return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest,
1184                                        BATADV_NO_FLAGS);
1185}
1186
1187/**
1188 * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag
1189 * @bat_priv: the bat priv with all the soft interface information
1190 *
1191 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
1192 * increases its refcount.
1193 */
1194static struct batadv_orig_node *
1195batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
1196{
1197        struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1198
1199        rcu_read_lock();
1200        hlist_for_each_entry_rcu(tmp_orig_node,
1201                                 &bat_priv->mcast.want_all_ipv4_list,
1202                                 mcast_want_all_ipv4_node) {
1203                if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1204                        continue;
1205
1206                orig_node = tmp_orig_node;
1207                break;
1208        }
1209        rcu_read_unlock();
1210
1211        return orig_node;
1212}
1213
1214/**
1215 * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag
1216 * @bat_priv: the bat priv with all the soft interface information
1217 *
1218 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
1219 * and increases its refcount.
1220 */
1221static struct batadv_orig_node *
1222batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
1223{
1224        struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1225
1226        rcu_read_lock();
1227        hlist_for_each_entry_rcu(tmp_orig_node,
1228                                 &bat_priv->mcast.want_all_ipv6_list,
1229                                 mcast_want_all_ipv6_node) {
1230                if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1231                        continue;
1232
1233                orig_node = tmp_orig_node;
1234                break;
1235        }
1236        rcu_read_unlock();
1237
1238        return orig_node;
1239}
1240
1241/**
1242 * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag
1243 * @bat_priv: the bat priv with all the soft interface information
1244 * @ethhdr: an ethernet header to determine the protocol family from
1245 *
1246 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
1247 * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, sets and
1248 * increases its refcount.
1249 */
1250static struct batadv_orig_node *
1251batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
1252                              struct ethhdr *ethhdr)
1253{
1254        switch (ntohs(ethhdr->h_proto)) {
1255        case ETH_P_IP:
1256                return batadv_mcast_forw_ipv4_node_get(bat_priv);
1257        case ETH_P_IPV6:
1258                return batadv_mcast_forw_ipv6_node_get(bat_priv);
1259        default:
1260                /* we shouldn't be here... */
1261                return NULL;
1262        }
1263}
1264
1265/**
1266 * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag
1267 * @bat_priv: the bat priv with all the soft interface information
1268 *
1269 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
1270 * set and increases its refcount.
1271 */
1272static struct batadv_orig_node *
1273batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
1274{
1275        struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1276
1277        rcu_read_lock();
1278        hlist_for_each_entry_rcu(tmp_orig_node,
1279                                 &bat_priv->mcast.want_all_unsnoopables_list,
1280                                 mcast_want_all_unsnoopables_node) {
1281                if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1282                        continue;
1283
1284                orig_node = tmp_orig_node;
1285                break;
1286        }
1287        rcu_read_unlock();
1288
1289        return orig_node;
1290}
1291
1292/**
1293 * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag
1294 * @bat_priv: the bat priv with all the soft interface information
1295 *
1296 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and
1297 * increases its refcount.
1298 */
1299static struct batadv_orig_node *
1300batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv)
1301{
1302        struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1303
1304        rcu_read_lock();
1305        hlist_for_each_entry_rcu(tmp_orig_node,
1306                                 &bat_priv->mcast.want_all_rtr4_list,
1307                                 mcast_want_all_rtr4_node) {
1308                if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1309                        continue;
1310
1311                orig_node = tmp_orig_node;
1312                break;
1313        }
1314        rcu_read_unlock();
1315
1316        return orig_node;
1317}
1318
1319/**
1320 * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag
1321 * @bat_priv: the bat priv with all the soft interface information
1322 *
1323 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset
1324 * and increases its refcount.
1325 */
1326static struct batadv_orig_node *
1327batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv)
1328{
1329        struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1330
1331        rcu_read_lock();
1332        hlist_for_each_entry_rcu(tmp_orig_node,
1333                                 &bat_priv->mcast.want_all_rtr6_list,
1334                                 mcast_want_all_rtr6_node) {
1335                if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1336                        continue;
1337
1338                orig_node = tmp_orig_node;
1339                break;
1340        }
1341        rcu_read_unlock();
1342
1343        return orig_node;
1344}
1345
1346/**
1347 * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag
1348 * @bat_priv: the bat priv with all the soft interface information
1349 * @ethhdr: an ethernet header to determine the protocol family from
1350 *
1351 * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or
1352 * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and
1353 * increases its refcount.
1354 */
1355static struct batadv_orig_node *
1356batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv,
1357                               struct ethhdr *ethhdr)
1358{
1359        switch (ntohs(ethhdr->h_proto)) {
1360        case ETH_P_IP:
1361                return batadv_mcast_forw_rtr4_node_get(bat_priv);
1362        case ETH_P_IPV6:
1363                return batadv_mcast_forw_rtr6_node_get(bat_priv);
1364        default:
1365                /* we shouldn't be here... */
1366                return NULL;
1367        }
1368}
1369
1370/**
1371 * batadv_mcast_forw_mode() - check on how to forward a multicast packet
1372 * @bat_priv: the bat priv with all the soft interface information
1373 * @skb: The multicast packet to check
1374 * @orig: an originator to be set to forward the skb to
1375 *
1376 * Return: the forwarding mode as enum batadv_forw_mode and in case of
1377 * BATADV_FORW_SINGLE set the orig to the single originator the skb
1378 * should be forwarded to.
1379 */
1380enum batadv_forw_mode
1381batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
1382                       struct batadv_orig_node **orig)
1383{
1384        int ret, tt_count, ip_count, unsnoop_count, total_count;
1385        bool is_unsnoopable = false;
1386        unsigned int mcast_fanout;
1387        struct ethhdr *ethhdr;
1388        int is_routable = 0;
1389        int rtr_count = 0;
1390
1391        ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable,
1392                                           &is_routable);
1393        if (ret == -ENOMEM)
1394                return BATADV_FORW_NONE;
1395        else if (ret < 0)
1396                return BATADV_FORW_ALL;
1397
1398        ethhdr = eth_hdr(skb);
1399
1400        tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
1401                                               BATADV_NO_FLAGS);
1402        ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
1403        unsnoop_count = !is_unsnoopable ? 0 :
1404                        atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
1405        rtr_count = batadv_mcast_forw_rtr_count(bat_priv, is_routable);
1406
1407        total_count = tt_count + ip_count + unsnoop_count + rtr_count;
1408
1409        switch (total_count) {
1410        case 1:
1411                if (tt_count)
1412                        *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
1413                else if (ip_count)
1414                        *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
1415                else if (unsnoop_count)
1416                        *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
1417                else if (rtr_count)
1418                        *orig = batadv_mcast_forw_rtr_node_get(bat_priv,
1419                                                               ethhdr);
1420
1421                if (*orig)
1422                        return BATADV_FORW_SINGLE;
1423
1424                fallthrough;
1425        case 0:
1426                return BATADV_FORW_NONE;
1427        default:
1428                mcast_fanout = atomic_read(&bat_priv->multicast_fanout);
1429
1430                if (!unsnoop_count && total_count <= mcast_fanout)
1431                        return BATADV_FORW_SOME;
1432        }
1433
1434        return BATADV_FORW_ALL;
1435}
1436
1437/**
1438 * batadv_mcast_forw_send_orig() - send a multicast packet to an originator
1439 * @bat_priv: the bat priv with all the soft interface information
1440 * @skb: the multicast packet to send
1441 * @vid: the vlan identifier
1442 * @orig_node: the originator to send the packet to
1443 *
1444 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
1445 */
1446int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
1447                                struct sk_buff *skb,
1448                                unsigned short vid,
1449                                struct batadv_orig_node *orig_node)
1450{
1451        /* Avoid sending multicast-in-unicast packets to other BLA
1452         * gateways - they already got the frame from the LAN side
1453         * we share with them.
1454         * TODO: Refactor to take BLA into account earlier, to avoid
1455         * reducing the mcast_fanout count.
1456         */
1457        if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) {
1458                dev_kfree_skb(skb);
1459                return NET_XMIT_SUCCESS;
1460        }
1461
1462        return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
1463                                       orig_node, vid);
1464}
1465
1466/**
1467 * batadv_mcast_forw_tt() - forwards a packet to multicast listeners
1468 * @bat_priv: the bat priv with all the soft interface information
1469 * @skb: the multicast packet to transmit
1470 * @vid: the vlan identifier
1471 *
1472 * Sends copies of a frame with multicast destination to any multicast
1473 * listener registered in the translation table. A transmission is performed
1474 * via a batman-adv unicast packet for each such destination node.
1475 *
1476 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1477 * otherwise.
1478 */
1479static int
1480batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb,
1481                     unsigned short vid)
1482{
1483        int ret = NET_XMIT_SUCCESS;
1484        struct sk_buff *newskb;
1485
1486        struct batadv_tt_orig_list_entry *orig_entry;
1487
1488        struct batadv_tt_global_entry *tt_global;
1489        const u8 *addr = eth_hdr(skb)->h_dest;
1490
1491        tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
1492        if (!tt_global)
1493                goto out;
1494
1495        rcu_read_lock();
1496        hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) {
1497                newskb = skb_copy(skb, GFP_ATOMIC);
1498                if (!newskb) {
1499                        ret = NET_XMIT_DROP;
1500                        break;
1501                }
1502
1503                batadv_mcast_forw_send_orig(bat_priv, newskb, vid,
1504                                            orig_entry->orig_node);
1505        }
1506        rcu_read_unlock();
1507
1508        batadv_tt_global_entry_put(tt_global);
1509
1510out:
1511        return ret;
1512}
1513
1514/**
1515 * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4
1516 * @bat_priv: the bat priv with all the soft interface information
1517 * @skb: the multicast packet to transmit
1518 * @vid: the vlan identifier
1519 *
1520 * Sends copies of a frame with multicast destination to any node with a
1521 * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a
1522 * batman-adv unicast packet for each such destination node.
1523 *
1524 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1525 * otherwise.
1526 */
1527static int
1528batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv,
1529                                struct sk_buff *skb, unsigned short vid)
1530{
1531        struct batadv_orig_node *orig_node;
1532        int ret = NET_XMIT_SUCCESS;
1533        struct sk_buff *newskb;
1534
1535        rcu_read_lock();
1536        hlist_for_each_entry_rcu(orig_node,
1537                                 &bat_priv->mcast.want_all_ipv4_list,
1538                                 mcast_want_all_ipv4_node) {
1539                newskb = skb_copy(skb, GFP_ATOMIC);
1540                if (!newskb) {
1541                        ret = NET_XMIT_DROP;
1542                        break;
1543                }
1544
1545                batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1546        }
1547        rcu_read_unlock();
1548        return ret;
1549}
1550
1551/**
1552 * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6
1553 * @bat_priv: the bat priv with all the soft interface information
1554 * @skb: The multicast packet to transmit
1555 * @vid: the vlan identifier
1556 *
1557 * Sends copies of a frame with multicast destination to any node with a
1558 * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a
1559 * batman-adv unicast packet for each such destination node.
1560 *
1561 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1562 * otherwise.
1563 */
1564static int
1565batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv,
1566                                struct sk_buff *skb, unsigned short vid)
1567{
1568        struct batadv_orig_node *orig_node;
1569        int ret = NET_XMIT_SUCCESS;
1570        struct sk_buff *newskb;
1571
1572        rcu_read_lock();
1573        hlist_for_each_entry_rcu(orig_node,
1574                                 &bat_priv->mcast.want_all_ipv6_list,
1575                                 mcast_want_all_ipv6_node) {
1576                newskb = skb_copy(skb, GFP_ATOMIC);
1577                if (!newskb) {
1578                        ret = NET_XMIT_DROP;
1579                        break;
1580                }
1581
1582                batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1583        }
1584        rcu_read_unlock();
1585        return ret;
1586}
1587
1588/**
1589 * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list
1590 * @bat_priv: the bat priv with all the soft interface information
1591 * @skb: the multicast packet to transmit
1592 * @vid: the vlan identifier
1593 *
1594 * Sends copies of a frame with multicast destination to any node with a
1595 * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A
1596 * transmission is performed via a batman-adv unicast packet for each such
1597 * destination node.
1598 *
1599 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1600 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1601 */
1602static int
1603batadv_mcast_forw_want_all(struct batadv_priv *bat_priv,
1604                           struct sk_buff *skb, unsigned short vid)
1605{
1606        switch (ntohs(eth_hdr(skb)->h_proto)) {
1607        case ETH_P_IP:
1608                return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid);
1609        case ETH_P_IPV6:
1610                return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid);
1611        default:
1612                /* we shouldn't be here... */
1613                return NET_XMIT_DROP;
1614        }
1615}
1616
1617/**
1618 * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4
1619 * @bat_priv: the bat priv with all the soft interface information
1620 * @skb: the multicast packet to transmit
1621 * @vid: the vlan identifier
1622 *
1623 * Sends copies of a frame with multicast destination to any node with a
1624 * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a
1625 * batman-adv unicast packet for each such destination node.
1626 *
1627 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1628 * otherwise.
1629 */
1630static int
1631batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv,
1632                                struct sk_buff *skb, unsigned short vid)
1633{
1634        struct batadv_orig_node *orig_node;
1635        int ret = NET_XMIT_SUCCESS;
1636        struct sk_buff *newskb;
1637
1638        rcu_read_lock();
1639        hlist_for_each_entry_rcu(orig_node,
1640                                 &bat_priv->mcast.want_all_rtr4_list,
1641                                 mcast_want_all_rtr4_node) {
1642                newskb = skb_copy(skb, GFP_ATOMIC);
1643                if (!newskb) {
1644                        ret = NET_XMIT_DROP;
1645                        break;
1646                }
1647
1648                batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1649        }
1650        rcu_read_unlock();
1651        return ret;
1652}
1653
1654/**
1655 * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6
1656 * @bat_priv: the bat priv with all the soft interface information
1657 * @skb: The multicast packet to transmit
1658 * @vid: the vlan identifier
1659 *
1660 * Sends copies of a frame with multicast destination to any node with a
1661 * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a
1662 * batman-adv unicast packet for each such destination node.
1663 *
1664 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1665 * otherwise.
1666 */
1667static int
1668batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv,
1669                                struct sk_buff *skb, unsigned short vid)
1670{
1671        struct batadv_orig_node *orig_node;
1672        int ret = NET_XMIT_SUCCESS;
1673        struct sk_buff *newskb;
1674
1675        rcu_read_lock();
1676        hlist_for_each_entry_rcu(orig_node,
1677                                 &bat_priv->mcast.want_all_rtr6_list,
1678                                 mcast_want_all_rtr6_node) {
1679                newskb = skb_copy(skb, GFP_ATOMIC);
1680                if (!newskb) {
1681                        ret = NET_XMIT_DROP;
1682                        break;
1683                }
1684
1685                batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1686        }
1687        rcu_read_unlock();
1688        return ret;
1689}
1690
1691/**
1692 * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list
1693 * @bat_priv: the bat priv with all the soft interface information
1694 * @skb: the multicast packet to transmit
1695 * @vid: the vlan identifier
1696 *
1697 * Sends copies of a frame with multicast destination to any node with a
1698 * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A
1699 * transmission is performed via a batman-adv unicast packet for each such
1700 * destination node.
1701 *
1702 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1703 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1704 */
1705static int
1706batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv,
1707                           struct sk_buff *skb, unsigned short vid)
1708{
1709        switch (ntohs(eth_hdr(skb)->h_proto)) {
1710        case ETH_P_IP:
1711                return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid);
1712        case ETH_P_IPV6:
1713                return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid);
1714        default:
1715                /* we shouldn't be here... */
1716                return NET_XMIT_DROP;
1717        }
1718}
1719
1720/**
1721 * batadv_mcast_forw_send() - send packet to any detected multicast recipient
1722 * @bat_priv: the bat priv with all the soft interface information
1723 * @skb: the multicast packet to transmit
1724 * @vid: the vlan identifier
1725 *
1726 * Sends copies of a frame with multicast destination to any node that signaled
1727 * interest in it, that is either via the translation table or the according
1728 * want-all flags. A transmission is performed via a batman-adv unicast packet
1729 * for each such destination node.
1730 *
1731 * The given skb is consumed/freed.
1732 *
1733 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1734 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1735 */
1736int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
1737                           unsigned short vid)
1738{
1739        int ret;
1740
1741        ret = batadv_mcast_forw_tt(bat_priv, skb, vid);
1742        if (ret != NET_XMIT_SUCCESS) {
1743                kfree_skb(skb);
1744                return ret;
1745        }
1746
1747        ret = batadv_mcast_forw_want_all(bat_priv, skb, vid);
1748        if (ret != NET_XMIT_SUCCESS) {
1749                kfree_skb(skb);
1750                return ret;
1751        }
1752
1753        ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid);
1754        if (ret != NET_XMIT_SUCCESS) {
1755                kfree_skb(skb);
1756                return ret;
1757        }
1758
1759        consume_skb(skb);
1760        return ret;
1761}
1762
1763/**
1764 * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list
1765 * @bat_priv: the bat priv with all the soft interface information
1766 * @orig: the orig_node which multicast state might have changed of
1767 * @mcast_flags: flags indicating the new multicast state
1768 *
1769 * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
1770 * orig, has toggled then this method updates the counter and the list
1771 * accordingly.
1772 *
1773 * Caller needs to hold orig->mcast_handler_lock.
1774 */
1775static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
1776                                             struct batadv_orig_node *orig,
1777                                             u8 mcast_flags)
1778{
1779        struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
1780        struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
1781
1782        lockdep_assert_held(&orig->mcast_handler_lock);
1783
1784        /* switched from flag unset to set */
1785        if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
1786            !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
1787                atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
1788
1789                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1790                /* flag checks above + mcast_handler_lock prevents this */
1791                WARN_ON(!hlist_unhashed(node));
1792
1793                hlist_add_head_rcu(node, head);
1794                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1795        /* switched from flag set to unset */
1796        } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
1797                   orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
1798                atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
1799
1800                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1801                /* flag checks above + mcast_handler_lock prevents this */
1802                WARN_ON(hlist_unhashed(node));
1803
1804                hlist_del_init_rcu(node);
1805                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1806        }
1807}
1808
1809/**
1810 * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list
1811 * @bat_priv: the bat priv with all the soft interface information
1812 * @orig: the orig_node which multicast state might have changed of
1813 * @mcast_flags: flags indicating the new multicast state
1814 *
1815 * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
1816 * toggled then this method updates the counter and the list accordingly.
1817 *
1818 * Caller needs to hold orig->mcast_handler_lock.
1819 */
1820static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
1821                                          struct batadv_orig_node *orig,
1822                                          u8 mcast_flags)
1823{
1824        struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
1825        struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
1826
1827        lockdep_assert_held(&orig->mcast_handler_lock);
1828
1829        /* switched from flag unset to set */
1830        if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
1831            !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
1832                atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
1833
1834                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1835                /* flag checks above + mcast_handler_lock prevents this */
1836                WARN_ON(!hlist_unhashed(node));
1837
1838                hlist_add_head_rcu(node, head);
1839                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1840        /* switched from flag set to unset */
1841        } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
1842                   orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
1843                atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
1844
1845                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1846                /* flag checks above + mcast_handler_lock prevents this */
1847                WARN_ON(hlist_unhashed(node));
1848
1849                hlist_del_init_rcu(node);
1850                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1851        }
1852}
1853
1854/**
1855 * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list
1856 * @bat_priv: the bat priv with all the soft interface information
1857 * @orig: the orig_node which multicast state might have changed of
1858 * @mcast_flags: flags indicating the new multicast state
1859 *
1860 * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
1861 * toggled then this method updates the counter and the list accordingly.
1862 *
1863 * Caller needs to hold orig->mcast_handler_lock.
1864 */
1865static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
1866                                          struct batadv_orig_node *orig,
1867                                          u8 mcast_flags)
1868{
1869        struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
1870        struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
1871
1872        lockdep_assert_held(&orig->mcast_handler_lock);
1873
1874        /* switched from flag unset to set */
1875        if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
1876            !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
1877                atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
1878
1879                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1880                /* flag checks above + mcast_handler_lock prevents this */
1881                WARN_ON(!hlist_unhashed(node));
1882
1883                hlist_add_head_rcu(node, head);
1884                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1885        /* switched from flag set to unset */
1886        } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
1887                   orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
1888                atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
1889
1890                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1891                /* flag checks above + mcast_handler_lock prevents this */
1892                WARN_ON(hlist_unhashed(node));
1893
1894                hlist_del_init_rcu(node);
1895                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1896        }
1897}
1898
1899/**
1900 * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list
1901 * @bat_priv: the bat priv with all the soft interface information
1902 * @orig: the orig_node which multicast state might have changed of
1903 * @mcast_flags: flags indicating the new multicast state
1904 *
1905 * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has
1906 * toggled then this method updates the counter and the list accordingly.
1907 *
1908 * Caller needs to hold orig->mcast_handler_lock.
1909 */
1910static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv,
1911                                          struct batadv_orig_node *orig,
1912                                          u8 mcast_flags)
1913{
1914        struct hlist_node *node = &orig->mcast_want_all_rtr4_node;
1915        struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list;
1916
1917        lockdep_assert_held(&orig->mcast_handler_lock);
1918
1919        /* switched from flag set to unset */
1920        if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) &&
1921            orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) {
1922                atomic_inc(&bat_priv->mcast.num_want_all_rtr4);
1923
1924                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1925                /* flag checks above + mcast_handler_lock prevents this */
1926                WARN_ON(!hlist_unhashed(node));
1927
1928                hlist_add_head_rcu(node, head);
1929                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1930        /* switched from flag unset to set */
1931        } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 &&
1932                   !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) {
1933                atomic_dec(&bat_priv->mcast.num_want_all_rtr4);
1934
1935                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1936                /* flag checks above + mcast_handler_lock prevents this */
1937                WARN_ON(hlist_unhashed(node));
1938
1939                hlist_del_init_rcu(node);
1940                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1941        }
1942}
1943
1944/**
1945 * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list
1946 * @bat_priv: the bat priv with all the soft interface information
1947 * @orig: the orig_node which multicast state might have changed of
1948 * @mcast_flags: flags indicating the new multicast state
1949 *
1950 * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has
1951 * toggled then this method updates the counter and the list accordingly.
1952 *
1953 * Caller needs to hold orig->mcast_handler_lock.
1954 */
1955static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv,
1956                                          struct batadv_orig_node *orig,
1957                                          u8 mcast_flags)
1958{
1959        struct hlist_node *node = &orig->mcast_want_all_rtr6_node;
1960        struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list;
1961
1962        lockdep_assert_held(&orig->mcast_handler_lock);
1963
1964        /* switched from flag set to unset */
1965        if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) &&
1966            orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) {
1967                atomic_inc(&bat_priv->mcast.num_want_all_rtr6);
1968
1969                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1970                /* flag checks above + mcast_handler_lock prevents this */
1971                WARN_ON(!hlist_unhashed(node));
1972
1973                hlist_add_head_rcu(node, head);
1974                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1975        /* switched from flag unset to set */
1976        } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 &&
1977                   !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) {
1978                atomic_dec(&bat_priv->mcast.num_want_all_rtr6);
1979
1980                spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1981                /* flag checks above + mcast_handler_lock prevents this */
1982                WARN_ON(hlist_unhashed(node));
1983
1984                hlist_del_init_rcu(node);
1985                spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1986        }
1987}
1988
1989/**
1990 * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV
1991 * @enabled: whether the originator has multicast TVLV support enabled
1992 * @tvlv_value: tvlv buffer containing the multicast flags
1993 * @tvlv_value_len: tvlv buffer length
1994 *
1995 * Return: multicast flags for the given tvlv buffer
1996 */
1997static u8
1998batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len)
1999{
2000        u8 mcast_flags = BATADV_NO_FLAGS;
2001
2002        if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags))
2003                mcast_flags = *(u8 *)tvlv_value;
2004
2005        if (!enabled) {
2006                mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4;
2007                mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6;
2008        }
2009
2010        /* remove redundant flags to avoid sending duplicate packets later */
2011        if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)
2012                mcast_flags |= BATADV_MCAST_WANT_NO_RTR4;
2013
2014        if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)
2015                mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
2016
2017        return mcast_flags;
2018}
2019
2020/**
2021 * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container
2022 * @bat_priv: the bat priv with all the soft interface information
2023 * @orig: the orig_node of the ogm
2024 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
2025 * @tvlv_value: tvlv buffer containing the multicast data
2026 * @tvlv_value_len: tvlv buffer length
2027 */
2028static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
2029                                          struct batadv_orig_node *orig,
2030                                          u8 flags,
2031                                          void *tvlv_value,
2032                                          u16 tvlv_value_len)
2033{
2034        bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
2035        u8 mcast_flags;
2036
2037        mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled,
2038                                                  tvlv_value, tvlv_value_len);
2039
2040        spin_lock_bh(&orig->mcast_handler_lock);
2041
2042        if (orig_mcast_enabled &&
2043            !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
2044                set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
2045        } else if (!orig_mcast_enabled &&
2046                   test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
2047                clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
2048        }
2049
2050        set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
2051
2052        batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
2053        batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
2054        batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
2055        batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags);
2056        batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags);
2057
2058        orig->mcast_flags = mcast_flags;
2059        spin_unlock_bh(&orig->mcast_handler_lock);
2060}
2061
2062/**
2063 * batadv_mcast_init() - initialize the multicast optimizations structures
2064 * @bat_priv: the bat priv with all the soft interface information
2065 */
2066void batadv_mcast_init(struct batadv_priv *bat_priv)
2067{
2068        batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
2069                                     NULL, BATADV_TVLV_MCAST, 2,
2070                                     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
2071
2072        INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
2073        batadv_mcast_start_timer(bat_priv);
2074}
2075
2076/**
2077 * batadv_mcast_mesh_info_put() - put multicast info into a netlink message
2078 * @msg: buffer for the message
2079 * @bat_priv: the bat priv with all the soft interface information
2080 *
2081 * Return: 0 or error code.
2082 */
2083int batadv_mcast_mesh_info_put(struct sk_buff *msg,
2084                               struct batadv_priv *bat_priv)
2085{
2086        u32 flags = bat_priv->mcast.mla_flags.tvlv_flags;
2087        u32 flags_priv = BATADV_NO_FLAGS;
2088
2089        if (bat_priv->mcast.mla_flags.bridged) {
2090                flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
2091
2092                if (bat_priv->mcast.mla_flags.querier_ipv4.exists)
2093                        flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
2094                if (bat_priv->mcast.mla_flags.querier_ipv6.exists)
2095                        flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
2096                if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing)
2097                        flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
2098                if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing)
2099                        flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
2100        }
2101
2102        if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
2103            nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
2104                return -EMSGSIZE;
2105
2106        return 0;
2107}
2108
2109/**
2110 * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
2111 *  to a netlink socket
2112 * @msg: buffer for the message
2113 * @portid: netlink port
2114 * @cb: Control block containing additional options
2115 * @orig_node: originator to dump the multicast flags of
2116 *
2117 * Return: 0 or error code.
2118 */
2119static int
2120batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid,
2121                              struct netlink_callback *cb,
2122                              struct batadv_orig_node *orig_node)
2123{
2124        void *hdr;
2125
2126        hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2127                          &batadv_netlink_family, NLM_F_MULTI,
2128                          BATADV_CMD_GET_MCAST_FLAGS);
2129        if (!hdr)
2130                return -ENOBUFS;
2131
2132        genl_dump_check_consistent(cb, hdr);
2133
2134        if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2135                    orig_node->orig)) {
2136                genlmsg_cancel(msg, hdr);
2137                return -EMSGSIZE;
2138        }
2139
2140        if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2141                     &orig_node->capabilities)) {
2142                if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
2143                                orig_node->mcast_flags)) {
2144                        genlmsg_cancel(msg, hdr);
2145                        return -EMSGSIZE;
2146                }
2147        }
2148
2149        genlmsg_end(msg, hdr);
2150        return 0;
2151}
2152
2153/**
2154 * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
2155 *  table to a netlink socket
2156 * @msg: buffer for the message
2157 * @portid: netlink port
2158 * @cb: Control block containing additional options
2159 * @hash: hash to dump
2160 * @bucket: bucket index to dump
2161 * @idx_skip: How many entries to skip
2162 *
2163 * Return: 0 or error code.
2164 */
2165static int
2166batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid,
2167                               struct netlink_callback *cb,
2168                               struct batadv_hashtable *hash,
2169                               unsigned int bucket, long *idx_skip)
2170{
2171        struct batadv_orig_node *orig_node;
2172        long idx = 0;
2173
2174        spin_lock_bh(&hash->list_locks[bucket]);
2175        cb->seq = atomic_read(&hash->generation) << 1 | 1;
2176
2177        hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) {
2178                if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2179                              &orig_node->capa_initialized))
2180                        continue;
2181
2182                if (idx < *idx_skip)
2183                        goto skip;
2184
2185                if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) {
2186                        spin_unlock_bh(&hash->list_locks[bucket]);
2187                        *idx_skip = idx;
2188
2189                        return -EMSGSIZE;
2190                }
2191
2192skip:
2193                idx++;
2194        }
2195        spin_unlock_bh(&hash->list_locks[bucket]);
2196
2197        return 0;
2198}
2199
2200/**
2201 * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
2202 * @msg: buffer for the message
2203 * @portid: netlink port
2204 * @cb: Control block containing additional options
2205 * @bat_priv: the bat priv with all the soft interface information
2206 * @bucket: current bucket to dump
2207 * @idx: index in current bucket to the next entry to dump
2208 *
2209 * Return: 0 or error code.
2210 */
2211static int
2212__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid,
2213                          struct netlink_callback *cb,
2214                          struct batadv_priv *bat_priv, long *bucket, long *idx)
2215{
2216        struct batadv_hashtable *hash = bat_priv->orig_hash;
2217        long bucket_tmp = *bucket;
2218        long idx_tmp = *idx;
2219
2220        while (bucket_tmp < hash->size) {
2221                if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash,
2222                                                   bucket_tmp, &idx_tmp))
2223                        break;
2224
2225                bucket_tmp++;
2226                idx_tmp = 0;
2227        }
2228
2229        *bucket = bucket_tmp;
2230        *idx = idx_tmp;
2231
2232        return msg->len;
2233}
2234
2235/**
2236 * batadv_mcast_netlink_get_primary() - get primary interface from netlink
2237 *  callback
2238 * @cb: netlink callback structure
2239 * @primary_if: the primary interface pointer to return the result in
2240 *
2241 * Return: 0 or error code.
2242 */
2243static int
2244batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
2245                                 struct batadv_hard_iface **primary_if)
2246{
2247        struct batadv_hard_iface *hard_iface = NULL;
2248        struct net *net = sock_net(cb->skb->sk);
2249        struct net_device *soft_iface;
2250        struct batadv_priv *bat_priv;
2251        int ifindex;
2252        int ret = 0;
2253
2254        ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2255        if (!ifindex)
2256                return -EINVAL;
2257
2258        soft_iface = dev_get_by_index(net, ifindex);
2259        if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2260                ret = -ENODEV;
2261                goto out;
2262        }
2263
2264        bat_priv = netdev_priv(soft_iface);
2265
2266        hard_iface = batadv_primary_if_get_selected(bat_priv);
2267        if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
2268                ret = -ENOENT;
2269                goto out;
2270        }
2271
2272out:
2273        if (soft_iface)
2274                dev_put(soft_iface);
2275
2276        if (!ret && primary_if)
2277                *primary_if = hard_iface;
2278        else if (hard_iface)
2279                batadv_hardif_put(hard_iface);
2280
2281        return ret;
2282}
2283
2284/**
2285 * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
2286 * @msg: buffer for the message
2287 * @cb: callback structure containing arguments
2288 *
2289 * Return: message length.
2290 */
2291int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
2292{
2293        struct batadv_hard_iface *primary_if = NULL;
2294        int portid = NETLINK_CB(cb->skb).portid;
2295        struct batadv_priv *bat_priv;
2296        long *bucket = &cb->args[0];
2297        long *idx = &cb->args[1];
2298        int ret;
2299
2300        ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
2301        if (ret)
2302                return ret;
2303
2304        bat_priv = netdev_priv(primary_if->soft_iface);
2305        ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx);
2306
2307        batadv_hardif_put(primary_if);
2308        return ret;
2309}
2310
2311/**
2312 * batadv_mcast_free() - free the multicast optimizations structures
2313 * @bat_priv: the bat priv with all the soft interface information
2314 */
2315void batadv_mcast_free(struct batadv_priv *bat_priv)
2316{
2317        cancel_delayed_work_sync(&bat_priv->mcast.work);
2318
2319        batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
2320        batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
2321
2322        /* safely calling outside of worker, as worker was canceled above */
2323        batadv_mcast_mla_tt_retract(bat_priv, NULL);
2324}
2325
2326/**
2327 * batadv_mcast_purge_orig() - reset originator global mcast state modifications
2328 * @orig: the originator which is going to get purged
2329 */
2330void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
2331{
2332        struct batadv_priv *bat_priv = orig->bat_priv;
2333
2334        spin_lock_bh(&orig->mcast_handler_lock);
2335
2336        batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
2337        batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
2338        batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
2339        batadv_mcast_want_rtr4_update(bat_priv, orig,
2340                                      BATADV_MCAST_WANT_NO_RTR4);
2341        batadv_mcast_want_rtr6_update(bat_priv, orig,
2342                                      BATADV_MCAST_WANT_NO_RTR6);
2343
2344        spin_unlock_bh(&orig->mcast_handler_lock);
2345}
2346