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TOMOYO Linux Cross Reference
Linux/net/batman-adv/multicast.c

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  1 /* Copyright (C) 2014-2016  B.A.T.M.A.N. contributors:
  2  *
  3  * Linus Lüssing
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of version 2 of the GNU General Public
  7  * License as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 12  * General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include "multicast.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/bitops.h>
 23 #include <linux/bug.h>
 24 #include <linux/byteorder/generic.h>
 25 #include <linux/errno.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/fs.h>
 28 #include <linux/icmpv6.h>
 29 #include <linux/if_bridge.h>
 30 #include <linux/if_ether.h>
 31 #include <linux/igmp.h>
 32 #include <linux/in.h>
 33 #include <linux/in6.h>
 34 #include <linux/ip.h>
 35 #include <linux/ipv6.h>
 36 #include <linux/kernel.h>
 37 #include <linux/kref.h>
 38 #include <linux/list.h>
 39 #include <linux/lockdep.h>
 40 #include <linux/netdevice.h>
 41 #include <linux/printk.h>
 42 #include <linux/rculist.h>
 43 #include <linux/rcupdate.h>
 44 #include <linux/seq_file.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/slab.h>
 47 #include <linux/spinlock.h>
 48 #include <linux/stddef.h>
 49 #include <linux/string.h>
 50 #include <linux/types.h>
 51 #include <net/addrconf.h>
 52 #include <net/if_inet6.h>
 53 #include <net/ip.h>
 54 #include <net/ipv6.h>
 55 
 56 #include "hard-interface.h"
 57 #include "hash.h"
 58 #include "log.h"
 59 #include "packet.h"
 60 #include "translation-table.h"
 61 #include "tvlv.h"
 62 
 63 /**
 64  * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists
 65  * @soft_iface: netdev struct of the mesh interface
 66  *
 67  * If the given soft interface has a bridge on top then the refcount
 68  * of the according net device is increased.
 69  *
 70  * Return: NULL if no such bridge exists. Otherwise the net device of the
 71  * bridge.
 72  */
 73 static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
 74 {
 75         struct net_device *upper = soft_iface;
 76 
 77         rcu_read_lock();
 78         do {
 79                 upper = netdev_master_upper_dev_get_rcu(upper);
 80         } while (upper && !(upper->priv_flags & IFF_EBRIDGE));
 81 
 82         if (upper)
 83                 dev_hold(upper);
 84         rcu_read_unlock();
 85 
 86         return upper;
 87 }
 88 
 89 /**
 90  * batadv_mcast_mla_softif_get - get softif multicast listeners
 91  * @dev: the device to collect multicast addresses from
 92  * @mcast_list: a list to put found addresses into
 93  *
 94  * Collects multicast addresses of multicast listeners residing
 95  * on this kernel on the given soft interface, dev, in
 96  * the given mcast_list. In general, multicast listeners provided by
 97  * your multicast receiving applications run directly on this node.
 98  *
 99  * If there is a bridge interface on top of dev, collects from that one
100  * instead. Just like with IP addresses and routes, multicast listeners
101  * will(/should) register to the bridge interface instead of an
102  * enslaved bat0.
103  *
104  * Return: -ENOMEM on memory allocation error or the number of
105  * items added to the mcast_list otherwise.
106  */
107 static int batadv_mcast_mla_softif_get(struct net_device *dev,
108                                        struct hlist_head *mcast_list)
109 {
110         struct net_device *bridge = batadv_mcast_get_bridge(dev);
111         struct netdev_hw_addr *mc_list_entry;
112         struct batadv_hw_addr *new;
113         int ret = 0;
114 
115         netif_addr_lock_bh(bridge ? bridge : dev);
116         netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) {
117                 new = kmalloc(sizeof(*new), GFP_ATOMIC);
118                 if (!new) {
119                         ret = -ENOMEM;
120                         break;
121                 }
122 
123                 ether_addr_copy(new->addr, mc_list_entry->addr);
124                 hlist_add_head(&new->list, mcast_list);
125                 ret++;
126         }
127         netif_addr_unlock_bh(bridge ? bridge : dev);
128 
129         if (bridge)
130                 dev_put(bridge);
131 
132         return ret;
133 }
134 
135 /**
136  * batadv_mcast_mla_is_duplicate - check whether an address is in a list
137  * @mcast_addr: the multicast address to check
138  * @mcast_list: the list with multicast addresses to search in
139  *
140  * Return: true if the given address is already in the given list.
141  * Otherwise returns false.
142  */
143 static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
144                                           struct hlist_head *mcast_list)
145 {
146         struct batadv_hw_addr *mcast_entry;
147 
148         hlist_for_each_entry(mcast_entry, mcast_list, list)
149                 if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
150                         return true;
151 
152         return false;
153 }
154 
155 /**
156  * batadv_mcast_mla_br_addr_cpy - copy a bridge multicast address
157  * @dst: destination to write to - a multicast MAC address
158  * @src: source to read from - a multicast IP address
159  *
160  * Converts a given multicast IPv4/IPv6 address from a bridge
161  * to its matching multicast MAC address and copies it into the given
162  * destination buffer.
163  *
164  * Caller needs to make sure the destination buffer can hold
165  * at least ETH_ALEN bytes.
166  */
167 static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
168 {
169         if (src->proto == htons(ETH_P_IP))
170                 ip_eth_mc_map(src->u.ip4, dst);
171 #if IS_ENABLED(CONFIG_IPV6)
172         else if (src->proto == htons(ETH_P_IPV6))
173                 ipv6_eth_mc_map(&src->u.ip6, dst);
174 #endif
175         else
176                 eth_zero_addr(dst);
177 }
178 
179 /**
180  * batadv_mcast_mla_bridge_get - get bridged-in multicast listeners
181  * @dev: a bridge slave whose bridge to collect multicast addresses from
182  * @mcast_list: a list to put found addresses into
183  *
184  * Collects multicast addresses of multicast listeners residing
185  * on foreign, non-mesh devices which we gave access to our mesh via
186  * a bridge on top of the given soft interface, dev, in the given
187  * mcast_list.
188  *
189  * Return: -ENOMEM on memory allocation error or the number of
190  * items added to the mcast_list otherwise.
191  */
192 static int batadv_mcast_mla_bridge_get(struct net_device *dev,
193                                        struct hlist_head *mcast_list)
194 {
195         struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
196         struct br_ip_list *br_ip_entry, *tmp;
197         struct batadv_hw_addr *new;
198         u8 mcast_addr[ETH_ALEN];
199         int ret;
200 
201         /* we don't need to detect these devices/listeners, the IGMP/MLD
202          * snooping code of the Linux bridge already does that for us
203          */
204         ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
205         if (ret < 0)
206                 goto out;
207 
208         list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
209                 batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
210                 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
211                         continue;
212 
213                 new = kmalloc(sizeof(*new), GFP_ATOMIC);
214                 if (!new) {
215                         ret = -ENOMEM;
216                         break;
217                 }
218 
219                 ether_addr_copy(new->addr, mcast_addr);
220                 hlist_add_head(&new->list, mcast_list);
221         }
222 
223 out:
224         list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
225                 list_del(&br_ip_entry->list);
226                 kfree(br_ip_entry);
227         }
228 
229         return ret;
230 }
231 
232 /**
233  * batadv_mcast_mla_list_free - free a list of multicast addresses
234  * @bat_priv: the bat priv with all the soft interface information
235  * @mcast_list: the list to free
236  *
237  * Removes and frees all items in the given mcast_list.
238  */
239 static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv,
240                                        struct hlist_head *mcast_list)
241 {
242         struct batadv_hw_addr *mcast_entry;
243         struct hlist_node *tmp;
244 
245         lockdep_assert_held(&bat_priv->tt.commit_lock);
246 
247         hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
248                 hlist_del(&mcast_entry->list);
249                 kfree(mcast_entry);
250         }
251 }
252 
253 /**
254  * batadv_mcast_mla_tt_retract - clean up multicast listener announcements
255  * @bat_priv: the bat priv with all the soft interface information
256  * @mcast_list: a list of addresses which should _not_ be removed
257  *
258  * Retracts the announcement of any multicast listener from the
259  * translation table except the ones listed in the given mcast_list.
260  *
261  * If mcast_list is NULL then all are retracted.
262  */
263 static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
264                                         struct hlist_head *mcast_list)
265 {
266         struct batadv_hw_addr *mcast_entry;
267         struct hlist_node *tmp;
268 
269         lockdep_assert_held(&bat_priv->tt.commit_lock);
270 
271         hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
272                                   list) {
273                 if (mcast_list &&
274                     batadv_mcast_mla_is_duplicate(mcast_entry->addr,
275                                                   mcast_list))
276                         continue;
277 
278                 batadv_tt_local_remove(bat_priv, mcast_entry->addr,
279                                        BATADV_NO_FLAGS,
280                                        "mcast TT outdated", false);
281 
282                 hlist_del(&mcast_entry->list);
283                 kfree(mcast_entry);
284         }
285 }
286 
287 /**
288  * batadv_mcast_mla_tt_add - add multicast listener announcements
289  * @bat_priv: the bat priv with all the soft interface information
290  * @mcast_list: a list of addresses which are going to get added
291  *
292  * Adds multicast listener announcements from the given mcast_list to the
293  * translation table if they have not been added yet.
294  */
295 static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
296                                     struct hlist_head *mcast_list)
297 {
298         struct batadv_hw_addr *mcast_entry;
299         struct hlist_node *tmp;
300 
301         lockdep_assert_held(&bat_priv->tt.commit_lock);
302 
303         if (!mcast_list)
304                 return;
305 
306         hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
307                 if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
308                                                   &bat_priv->mcast.mla_list))
309                         continue;
310 
311                 if (!batadv_tt_local_add(bat_priv->soft_iface,
312                                          mcast_entry->addr, BATADV_NO_FLAGS,
313                                          BATADV_NULL_IFINDEX, BATADV_NO_MARK))
314                         continue;
315 
316                 hlist_del(&mcast_entry->list);
317                 hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
318         }
319 }
320 
321 /**
322  * batadv_mcast_has_bridge - check whether the soft-iface is bridged
323  * @bat_priv: the bat priv with all the soft interface information
324  *
325  * Checks whether there is a bridge on top of our soft interface.
326  *
327  * Return: true if there is a bridge, false otherwise.
328  */
329 static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv)
330 {
331         struct net_device *upper = bat_priv->soft_iface;
332 
333         rcu_read_lock();
334         do {
335                 upper = netdev_master_upper_dev_get_rcu(upper);
336         } while (upper && !(upper->priv_flags & IFF_EBRIDGE));
337         rcu_read_unlock();
338 
339         return upper;
340 }
341 
342 /**
343  * batadv_mcast_querier_log - debug output regarding the querier status on link
344  * @bat_priv: the bat priv with all the soft interface information
345  * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
346  * @old_state: the previous querier state on our link
347  * @new_state: the new querier state on our link
348  *
349  * Outputs debug messages to the logging facility with log level 'mcast'
350  * regarding changes to the querier status on the link which are relevant
351  * to our multicast optimizations.
352  *
353  * Usually this is about whether a querier appeared or vanished in
354  * our mesh or whether the querier is in the suboptimal position of being
355  * behind our local bridge segment: Snooping switches will directly
356  * forward listener reports to the querier, therefore batman-adv and
357  * the bridge will potentially not see these listeners - the querier is
358  * potentially shadowing listeners from us then.
359  *
360  * This is only interesting for nodes with a bridge on top of their
361  * soft interface.
362  */
363 static void
364 batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
365                          struct batadv_mcast_querier_state *old_state,
366                          struct batadv_mcast_querier_state *new_state)
367 {
368         if (!old_state->exists && new_state->exists)
369                 batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
370                             str_proto);
371         else if (old_state->exists && !new_state->exists)
372                 batadv_info(bat_priv->soft_iface,
373                             "%s Querier disappeared - multicast optimizations disabled\n",
374                             str_proto);
375         else if (!bat_priv->mcast.bridged && !new_state->exists)
376                 batadv_info(bat_priv->soft_iface,
377                             "No %s Querier present - multicast optimizations disabled\n",
378                             str_proto);
379 
380         if (new_state->exists) {
381                 if ((!old_state->shadowing && new_state->shadowing) ||
382                     (!old_state->exists && new_state->shadowing))
383                         batadv_dbg(BATADV_DBG_MCAST, bat_priv,
384                                    "%s Querier is behind our bridged segment: Might shadow listeners\n",
385                                    str_proto);
386                 else if (old_state->shadowing && !new_state->shadowing)
387                         batadv_dbg(BATADV_DBG_MCAST, bat_priv,
388                                    "%s Querier is not behind our bridged segment\n",
389                                    str_proto);
390         }
391 }
392 
393 /**
394  * batadv_mcast_bridge_log - debug output for topology changes in bridged setups
395  * @bat_priv: the bat priv with all the soft interface information
396  * @bridged: a flag about whether the soft interface is currently bridged or not
397  * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier
398  * @querier_ipv6: (maybe) new status of a potential, selected MLD querier
399  *
400  * If no bridges are ever used on this node, then this function does nothing.
401  *
402  * Otherwise this function outputs debug information to the 'mcast' log level
403  * which might be relevant to our multicast optimizations.
404  *
405  * More precisely, it outputs information when a bridge interface is added or
406  * removed from a soft interface. And when a bridge is present, it further
407  * outputs information about the querier state which is relevant for the
408  * multicast flags this node is going to set.
409  */
410 static void
411 batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged,
412                         struct batadv_mcast_querier_state *querier_ipv4,
413                         struct batadv_mcast_querier_state *querier_ipv6)
414 {
415         if (!bat_priv->mcast.bridged && bridged)
416                 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
417                            "Bridge added: Setting Unsnoopables(U)-flag\n");
418         else if (bat_priv->mcast.bridged && !bridged)
419                 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
420                            "Bridge removed: Unsetting Unsnoopables(U)-flag\n");
421 
422         if (bridged) {
423                 batadv_mcast_querier_log(bat_priv, "IGMP",
424                                          &bat_priv->mcast.querier_ipv4,
425                                          querier_ipv4);
426                 batadv_mcast_querier_log(bat_priv, "MLD",
427                                          &bat_priv->mcast.querier_ipv6,
428                                          querier_ipv6);
429         }
430 }
431 
432 /**
433  * batadv_mcast_flags_logs - output debug information about mcast flag changes
434  * @bat_priv: the bat priv with all the soft interface information
435  * @flags: flags indicating the new multicast state
436  *
437  * Whenever the multicast flags this nodes announces changes (@mcast_flags vs.
438  * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level.
439  */
440 static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
441 {
442         u8 old_flags = bat_priv->mcast.flags;
443         char str_old_flags[] = "[...]";
444 
445         sprintf(str_old_flags, "[%c%c%c]",
446                 (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
447                 (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
448                 (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
449 
450         batadv_dbg(BATADV_DBG_MCAST, bat_priv,
451                    "Changing multicast flags from '%s' to '[%c%c%c]'\n",
452                    bat_priv->mcast.enabled ? str_old_flags : "<undefined>",
453                    (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
454                    (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
455                    (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
456 }
457 
458 /**
459  * batadv_mcast_mla_tvlv_update - update multicast tvlv
460  * @bat_priv: the bat priv with all the soft interface information
461  *
462  * Updates the own multicast tvlv with our current multicast related settings,
463  * capabilities and inabilities.
464  *
465  * Return: false if we want all IPv4 && IPv6 multicast traffic and true
466  * otherwise.
467  */
468 static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
469 {
470         struct batadv_tvlv_mcast_data mcast_data;
471         struct batadv_mcast_querier_state querier4 = {false, false};
472         struct batadv_mcast_querier_state querier6 = {false, false};
473         struct net_device *dev = bat_priv->soft_iface;
474         bool bridged;
475 
476         mcast_data.flags = BATADV_NO_FLAGS;
477         memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
478 
479         bridged = batadv_mcast_has_bridge(bat_priv);
480         if (!bridged)
481                 goto update;
482 
483 #if !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
484         pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
485 #endif
486 
487         querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
488         querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
489 
490         querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
491         querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
492 
493         mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
494 
495         /* 1) If no querier exists at all, then multicast listeners on
496          *    our local TT clients behind the bridge will keep silent.
497          * 2) If the selected querier is on one of our local TT clients,
498          *    behind the bridge, then this querier might shadow multicast
499          *    listeners on our local TT clients, behind this bridge.
500          *
501          * In both cases, we will signalize other batman nodes that
502          * we need all multicast traffic of the according protocol.
503          */
504         if (!querier4.exists || querier4.shadowing)
505                 mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4;
506 
507         if (!querier6.exists || querier6.shadowing)
508                 mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6;
509 
510 update:
511         batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6);
512 
513         bat_priv->mcast.querier_ipv4.exists = querier4.exists;
514         bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing;
515 
516         bat_priv->mcast.querier_ipv6.exists = querier6.exists;
517         bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing;
518 
519         bat_priv->mcast.bridged = bridged;
520 
521         if (!bat_priv->mcast.enabled ||
522             mcast_data.flags != bat_priv->mcast.flags) {
523                 batadv_mcast_flags_log(bat_priv, mcast_data.flags);
524                 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
525                                                &mcast_data, sizeof(mcast_data));
526                 bat_priv->mcast.flags = mcast_data.flags;
527                 bat_priv->mcast.enabled = true;
528         }
529 
530         return !(mcast_data.flags &
531                  (BATADV_MCAST_WANT_ALL_IPV4 + BATADV_MCAST_WANT_ALL_IPV6));
532 }
533 
534 /**
535  * batadv_mcast_mla_update - update the own MLAs
536  * @bat_priv: the bat priv with all the soft interface information
537  *
538  * Updates the own multicast listener announcements in the translation
539  * table as well as the own, announced multicast tvlv container.
540  */
541 void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
542 {
543         struct net_device *soft_iface = bat_priv->soft_iface;
544         struct hlist_head mcast_list = HLIST_HEAD_INIT;
545         int ret;
546 
547         if (!batadv_mcast_mla_tvlv_update(bat_priv))
548                 goto update;
549 
550         ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list);
551         if (ret < 0)
552                 goto out;
553 
554         ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list);
555         if (ret < 0)
556                 goto out;
557 
558 update:
559         batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
560         batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
561 
562 out:
563         batadv_mcast_mla_list_free(bat_priv, &mcast_list);
564 }
565 
566 /**
567  * batadv_mcast_is_report_ipv4 - check for IGMP reports
568  * @skb: the ethernet frame destined for the mesh
569  *
570  * This call might reallocate skb data.
571  *
572  * Checks whether the given frame is a valid IGMP report.
573  *
574  * Return: If so then true, otherwise false.
575  */
576 static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
577 {
578         if (ip_mc_check_igmp(skb, NULL) < 0)
579                 return false;
580 
581         switch (igmp_hdr(skb)->type) {
582         case IGMP_HOST_MEMBERSHIP_REPORT:
583         case IGMPV2_HOST_MEMBERSHIP_REPORT:
584         case IGMPV3_HOST_MEMBERSHIP_REPORT:
585                 return true;
586         }
587 
588         return false;
589 }
590 
591 /**
592  * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential
593  * @bat_priv: the bat priv with all the soft interface information
594  * @skb: the IPv4 packet to check
595  * @is_unsnoopable: stores whether the destination is snoopable
596  *
597  * Checks whether the given IPv4 packet has the potential to be forwarded with a
598  * mode more optimal than classic flooding.
599  *
600  * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
601  * allocation failure.
602  */
603 static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
604                                              struct sk_buff *skb,
605                                              bool *is_unsnoopable)
606 {
607         struct iphdr *iphdr;
608 
609         /* We might fail due to out-of-memory -> drop it */
610         if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
611                 return -ENOMEM;
612 
613         if (batadv_mcast_is_report_ipv4(skb))
614                 return -EINVAL;
615 
616         iphdr = ip_hdr(skb);
617 
618         /* TODO: Implement Multicast Router Discovery (RFC4286),
619          * then allow scope > link local, too
620          */
621         if (!ipv4_is_local_multicast(iphdr->daddr))
622                 return -EINVAL;
623 
624         /* link-local multicast listeners behind a bridge are
625          * not snoopable (see RFC4541, section 2.1.2.2)
626          */
627         *is_unsnoopable = true;
628 
629         return 0;
630 }
631 
632 #if IS_ENABLED(CONFIG_IPV6)
633 /**
634  * batadv_mcast_is_report_ipv6 - check for MLD reports
635  * @skb: the ethernet frame destined for the mesh
636  *
637  * This call might reallocate skb data.
638  *
639  * Checks whether the given frame is a valid MLD report.
640  *
641  * Return: If so then true, otherwise false.
642  */
643 static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
644 {
645         if (ipv6_mc_check_mld(skb, NULL) < 0)
646                 return false;
647 
648         switch (icmp6_hdr(skb)->icmp6_type) {
649         case ICMPV6_MGM_REPORT:
650         case ICMPV6_MLD2_REPORT:
651                 return true;
652         }
653 
654         return false;
655 }
656 
657 /**
658  * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential
659  * @bat_priv: the bat priv with all the soft interface information
660  * @skb: the IPv6 packet to check
661  * @is_unsnoopable: stores whether the destination is snoopable
662  *
663  * Checks whether the given IPv6 packet has the potential to be forwarded with a
664  * mode more optimal than classic flooding.
665  *
666  * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
667  */
668 static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
669                                              struct sk_buff *skb,
670                                              bool *is_unsnoopable)
671 {
672         struct ipv6hdr *ip6hdr;
673 
674         /* We might fail due to out-of-memory -> drop it */
675         if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
676                 return -ENOMEM;
677 
678         if (batadv_mcast_is_report_ipv6(skb))
679                 return -EINVAL;
680 
681         ip6hdr = ipv6_hdr(skb);
682 
683         /* TODO: Implement Multicast Router Discovery (RFC4286),
684          * then allow scope > link local, too
685          */
686         if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL)
687                 return -EINVAL;
688 
689         /* link-local-all-nodes multicast listeners behind a bridge are
690          * not snoopable (see RFC4541, section 3, paragraph 3)
691          */
692         if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
693                 *is_unsnoopable = true;
694 
695         return 0;
696 }
697 #endif
698 
699 /**
700  * batadv_mcast_forw_mode_check - check for optimized forwarding potential
701  * @bat_priv: the bat priv with all the soft interface information
702  * @skb: the multicast frame to check
703  * @is_unsnoopable: stores whether the destination is snoopable
704  *
705  * Checks whether the given multicast ethernet frame has the potential to be
706  * forwarded with a mode more optimal than classic flooding.
707  *
708  * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
709  */
710 static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
711                                         struct sk_buff *skb,
712                                         bool *is_unsnoopable)
713 {
714         struct ethhdr *ethhdr = eth_hdr(skb);
715 
716         if (!atomic_read(&bat_priv->multicast_mode))
717                 return -EINVAL;
718 
719         if (atomic_read(&bat_priv->mcast.num_disabled))
720                 return -EINVAL;
721 
722         switch (ntohs(ethhdr->h_proto)) {
723         case ETH_P_IP:
724                 return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
725                                                          is_unsnoopable);
726 #if IS_ENABLED(CONFIG_IPV6)
727         case ETH_P_IPV6:
728                 return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
729                                                          is_unsnoopable);
730 #endif
731         default:
732                 return -EINVAL;
733         }
734 }
735 
736 /**
737  * batadv_mcast_forw_want_all_ip_count - count nodes with unspecific mcast
738  *  interest
739  * @bat_priv: the bat priv with all the soft interface information
740  * @ethhdr: ethernet header of a packet
741  *
742  * Return: the number of nodes which want all IPv4 multicast traffic if the
743  * given ethhdr is from an IPv4 packet or the number of nodes which want all
744  * IPv6 traffic if it matches an IPv6 packet.
745  */
746 static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
747                                                struct ethhdr *ethhdr)
748 {
749         switch (ntohs(ethhdr->h_proto)) {
750         case ETH_P_IP:
751                 return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
752         case ETH_P_IPV6:
753                 return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
754         default:
755                 /* we shouldn't be here... */
756                 return 0;
757         }
758 }
759 
760 /**
761  * batadv_mcast_forw_tt_node_get - get a multicast tt node
762  * @bat_priv: the bat priv with all the soft interface information
763  * @ethhdr: the ether header containing the multicast destination
764  *
765  * Return: an orig_node matching the multicast address provided by ethhdr
766  * via a translation table lookup. This increases the returned nodes refcount.
767  */
768 static struct batadv_orig_node *
769 batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
770                               struct ethhdr *ethhdr)
771 {
772         return batadv_transtable_search(bat_priv, ethhdr->h_source,
773                                         ethhdr->h_dest, BATADV_NO_FLAGS);
774 }
775 
776 /**
777  * batadv_mcast_forw_ipv4_node_get - get a node with an ipv4 flag
778  * @bat_priv: the bat priv with all the soft interface information
779  *
780  * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
781  * increases its refcount.
782  */
783 static struct batadv_orig_node *
784 batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
785 {
786         struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
787 
788         rcu_read_lock();
789         hlist_for_each_entry_rcu(tmp_orig_node,
790                                  &bat_priv->mcast.want_all_ipv4_list,
791                                  mcast_want_all_ipv4_node) {
792                 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
793                         continue;
794 
795                 orig_node = tmp_orig_node;
796                 break;
797         }
798         rcu_read_unlock();
799 
800         return orig_node;
801 }
802 
803 /**
804  * batadv_mcast_forw_ipv6_node_get - get a node with an ipv6 flag
805  * @bat_priv: the bat priv with all the soft interface information
806  *
807  * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
808  * and increases its refcount.
809  */
810 static struct batadv_orig_node *
811 batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
812 {
813         struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
814 
815         rcu_read_lock();
816         hlist_for_each_entry_rcu(tmp_orig_node,
817                                  &bat_priv->mcast.want_all_ipv6_list,
818                                  mcast_want_all_ipv6_node) {
819                 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
820                         continue;
821 
822                 orig_node = tmp_orig_node;
823                 break;
824         }
825         rcu_read_unlock();
826 
827         return orig_node;
828 }
829 
830 /**
831  * batadv_mcast_forw_ip_node_get - get a node with an ipv4/ipv6 flag
832  * @bat_priv: the bat priv with all the soft interface information
833  * @ethhdr: an ethernet header to determine the protocol family from
834  *
835  * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
836  * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and
837  * increases its refcount.
838  */
839 static struct batadv_orig_node *
840 batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
841                               struct ethhdr *ethhdr)
842 {
843         switch (ntohs(ethhdr->h_proto)) {
844         case ETH_P_IP:
845                 return batadv_mcast_forw_ipv4_node_get(bat_priv);
846         case ETH_P_IPV6:
847                 return batadv_mcast_forw_ipv6_node_get(bat_priv);
848         default:
849                 /* we shouldn't be here... */
850                 return NULL;
851         }
852 }
853 
854 /**
855  * batadv_mcast_forw_unsnoop_node_get - get a node with an unsnoopable flag
856  * @bat_priv: the bat priv with all the soft interface information
857  *
858  * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
859  * set and increases its refcount.
860  */
861 static struct batadv_orig_node *
862 batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
863 {
864         struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
865 
866         rcu_read_lock();
867         hlist_for_each_entry_rcu(tmp_orig_node,
868                                  &bat_priv->mcast.want_all_unsnoopables_list,
869                                  mcast_want_all_unsnoopables_node) {
870                 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
871                         continue;
872 
873                 orig_node = tmp_orig_node;
874                 break;
875         }
876         rcu_read_unlock();
877 
878         return orig_node;
879 }
880 
881 /**
882  * batadv_mcast_forw_mode - check on how to forward a multicast packet
883  * @bat_priv: the bat priv with all the soft interface information
884  * @skb: The multicast packet to check
885  * @orig: an originator to be set to forward the skb to
886  *
887  * Return: the forwarding mode as enum batadv_forw_mode and in case of
888  * BATADV_FORW_SINGLE set the orig to the single originator the skb
889  * should be forwarded to.
890  */
891 enum batadv_forw_mode
892 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
893                        struct batadv_orig_node **orig)
894 {
895         int ret, tt_count, ip_count, unsnoop_count, total_count;
896         bool is_unsnoopable = false;
897         struct ethhdr *ethhdr;
898 
899         ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable);
900         if (ret == -ENOMEM)
901                 return BATADV_FORW_NONE;
902         else if (ret < 0)
903                 return BATADV_FORW_ALL;
904 
905         ethhdr = eth_hdr(skb);
906 
907         tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
908                                                BATADV_NO_FLAGS);
909         ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
910         unsnoop_count = !is_unsnoopable ? 0 :
911                         atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
912 
913         total_count = tt_count + ip_count + unsnoop_count;
914 
915         switch (total_count) {
916         case 1:
917                 if (tt_count)
918                         *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
919                 else if (ip_count)
920                         *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
921                 else if (unsnoop_count)
922                         *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
923 
924                 if (*orig)
925                         return BATADV_FORW_SINGLE;
926 
927                 /* fall through */
928         case 0:
929                 return BATADV_FORW_NONE;
930         default:
931                 return BATADV_FORW_ALL;
932         }
933 }
934 
935 /**
936  * batadv_mcast_want_unsnoop_update - update unsnoop counter and list
937  * @bat_priv: the bat priv with all the soft interface information
938  * @orig: the orig_node which multicast state might have changed of
939  * @mcast_flags: flags indicating the new multicast state
940  *
941  * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
942  * orig, has toggled then this method updates counter and list accordingly.
943  *
944  * Caller needs to hold orig->mcast_handler_lock.
945  */
946 static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
947                                              struct batadv_orig_node *orig,
948                                              u8 mcast_flags)
949 {
950         struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
951         struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
952 
953         lockdep_assert_held(&orig->mcast_handler_lock);
954 
955         /* switched from flag unset to set */
956         if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
957             !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
958                 atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
959 
960                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
961                 /* flag checks above + mcast_handler_lock prevents this */
962                 WARN_ON(!hlist_unhashed(node));
963 
964                 hlist_add_head_rcu(node, head);
965                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
966         /* switched from flag set to unset */
967         } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
968                    orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
969                 atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
970 
971                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
972                 /* flag checks above + mcast_handler_lock prevents this */
973                 WARN_ON(hlist_unhashed(node));
974 
975                 hlist_del_init_rcu(node);
976                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
977         }
978 }
979 
980 /**
981  * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list
982  * @bat_priv: the bat priv with all the soft interface information
983  * @orig: the orig_node which multicast state might have changed of
984  * @mcast_flags: flags indicating the new multicast state
985  *
986  * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
987  * toggled then this method updates counter and list accordingly.
988  *
989  * Caller needs to hold orig->mcast_handler_lock.
990  */
991 static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
992                                           struct batadv_orig_node *orig,
993                                           u8 mcast_flags)
994 {
995         struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
996         struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
997 
998         lockdep_assert_held(&orig->mcast_handler_lock);
999 
1000         /* switched from flag unset to set */
1001         if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
1002             !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
1003                 atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
1004 
1005                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1006                 /* flag checks above + mcast_handler_lock prevents this */
1007                 WARN_ON(!hlist_unhashed(node));
1008 
1009                 hlist_add_head_rcu(node, head);
1010                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1011         /* switched from flag set to unset */
1012         } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
1013                    orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
1014                 atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
1015 
1016                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1017                 /* flag checks above + mcast_handler_lock prevents this */
1018                 WARN_ON(hlist_unhashed(node));
1019 
1020                 hlist_del_init_rcu(node);
1021                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1022         }
1023 }
1024 
1025 /**
1026  * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list
1027  * @bat_priv: the bat priv with all the soft interface information
1028  * @orig: the orig_node which multicast state might have changed of
1029  * @mcast_flags: flags indicating the new multicast state
1030  *
1031  * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
1032  * toggled then this method updates counter and list accordingly.
1033  *
1034  * Caller needs to hold orig->mcast_handler_lock.
1035  */
1036 static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
1037                                           struct batadv_orig_node *orig,
1038                                           u8 mcast_flags)
1039 {
1040         struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
1041         struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
1042 
1043         lockdep_assert_held(&orig->mcast_handler_lock);
1044 
1045         /* switched from flag unset to set */
1046         if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
1047             !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
1048                 atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
1049 
1050                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1051                 /* flag checks above + mcast_handler_lock prevents this */
1052                 WARN_ON(!hlist_unhashed(node));
1053 
1054                 hlist_add_head_rcu(node, head);
1055                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1056         /* switched from flag set to unset */
1057         } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
1058                    orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
1059                 atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
1060 
1061                 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1062                 /* flag checks above + mcast_handler_lock prevents this */
1063                 WARN_ON(hlist_unhashed(node));
1064 
1065                 hlist_del_init_rcu(node);
1066                 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1067         }
1068 }
1069 
1070 /**
1071  * batadv_mcast_tvlv_ogm_handler - process incoming multicast tvlv container
1072  * @bat_priv: the bat priv with all the soft interface information
1073  * @orig: the orig_node of the ogm
1074  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
1075  * @tvlv_value: tvlv buffer containing the multicast data
1076  * @tvlv_value_len: tvlv buffer length
1077  */
1078 static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
1079                                           struct batadv_orig_node *orig,
1080                                           u8 flags,
1081                                           void *tvlv_value,
1082                                           u16 tvlv_value_len)
1083 {
1084         bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
1085         u8 mcast_flags = BATADV_NO_FLAGS;
1086         bool orig_initialized;
1087 
1088         if (orig_mcast_enabled && tvlv_value &&
1089             (tvlv_value_len >= sizeof(mcast_flags)))
1090                 mcast_flags = *(u8 *)tvlv_value;
1091 
1092         spin_lock_bh(&orig->mcast_handler_lock);
1093         orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
1094                                     &orig->capa_initialized);
1095 
1096         /* If mcast support is turned on decrease the disabled mcast node
1097          * counter only if we had increased it for this node before. If this
1098          * is a completely new orig_node no need to decrease the counter.
1099          */
1100         if (orig_mcast_enabled &&
1101             !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
1102                 if (orig_initialized)
1103                         atomic_dec(&bat_priv->mcast.num_disabled);
1104                 set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
1105         /* If mcast support is being switched off or if this is an initial
1106          * OGM without mcast support then increase the disabled mcast
1107          * node counter.
1108          */
1109         } else if (!orig_mcast_enabled &&
1110                    (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) ||
1111                     !orig_initialized)) {
1112                 atomic_inc(&bat_priv->mcast.num_disabled);
1113                 clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
1114         }
1115 
1116         set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
1117 
1118         batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
1119         batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
1120         batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
1121 
1122         orig->mcast_flags = mcast_flags;
1123         spin_unlock_bh(&orig->mcast_handler_lock);
1124 }
1125 
1126 /**
1127  * batadv_mcast_init - initialize the multicast optimizations structures
1128  * @bat_priv: the bat priv with all the soft interface information
1129  */
1130 void batadv_mcast_init(struct batadv_priv *bat_priv)
1131 {
1132         batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
1133                                      NULL, BATADV_TVLV_MCAST, 2,
1134                                      BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
1135 }
1136 
1137 /**
1138  * batadv_mcast_flags_print_header - print own mcast flags to debugfs table
1139  * @bat_priv: the bat priv with all the soft interface information
1140  * @seq: debugfs table seq_file struct
1141  *
1142  * Prints our own multicast flags including a more specific reason why
1143  * they are set, that is prints the bridge and querier state too, to
1144  * the debugfs table specified via @seq.
1145  */
1146 static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv,
1147                                             struct seq_file *seq)
1148 {
1149         u8 flags = bat_priv->mcast.flags;
1150         char querier4, querier6, shadowing4, shadowing6;
1151         bool bridged = bat_priv->mcast.bridged;
1152 
1153         if (bridged) {
1154                 querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4';
1155                 querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6';
1156                 shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.';
1157                 shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.';
1158         } else {
1159                 querier4 = '?';
1160                 querier6 = '?';
1161                 shadowing4 = '?';
1162                 shadowing6 = '?';
1163         }
1164 
1165         seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n",
1166                    (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
1167                    (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
1168                    (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
1169         seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.');
1170         seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n",
1171                    querier4, querier6);
1172         seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n",
1173                    shadowing4, shadowing6);
1174         seq_puts(seq, "-------------------------------------------\n");
1175         seq_printf(seq, "       %-10s %s\n", "Originator", "Flags");
1176 }
1177 
1178 /**
1179  * batadv_mcast_flags_seq_print_text - print the mcast flags of other nodes
1180  * @seq: seq file to print on
1181  * @offset: not used
1182  *
1183  * This prints a table of (primary) originators and their according
1184  * multicast flags, including (in the header) our own.
1185  *
1186  * Return: always 0
1187  */
1188 int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
1189 {
1190         struct net_device *net_dev = (struct net_device *)seq->private;
1191         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1192         struct batadv_hard_iface *primary_if;
1193         struct batadv_hashtable *hash = bat_priv->orig_hash;
1194         struct batadv_orig_node *orig_node;
1195         struct hlist_head *head;
1196         u8 flags;
1197         u32 i;
1198 
1199         primary_if = batadv_seq_print_text_primary_if_get(seq);
1200         if (!primary_if)
1201                 return 0;
1202 
1203         batadv_mcast_flags_print_header(bat_priv, seq);
1204 
1205         for (i = 0; i < hash->size; i++) {
1206                 head = &hash->table[i];
1207 
1208                 rcu_read_lock();
1209                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1210                         if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
1211                                       &orig_node->capa_initialized))
1212                                 continue;
1213 
1214                         if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
1215                                       &orig_node->capabilities)) {
1216                                 seq_printf(seq, "%pM -\n", orig_node->orig);
1217                                 continue;
1218                         }
1219 
1220                         flags = orig_node->mcast_flags;
1221 
1222                         seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig,
1223                                    (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)
1224                                    ? 'U' : '.',
1225                                    (flags & BATADV_MCAST_WANT_ALL_IPV4)
1226                                    ? '4' : '.',
1227                                    (flags & BATADV_MCAST_WANT_ALL_IPV6)
1228                                    ? '6' : '.');
1229                 }
1230                 rcu_read_unlock();
1231         }
1232 
1233         batadv_hardif_put(primary_if);
1234 
1235         return 0;
1236 }
1237 
1238 /**
1239  * batadv_mcast_free - free the multicast optimizations structures
1240  * @bat_priv: the bat priv with all the soft interface information
1241  */
1242 void batadv_mcast_free(struct batadv_priv *bat_priv)
1243 {
1244         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
1245         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
1246 
1247         spin_lock_bh(&bat_priv->tt.commit_lock);
1248         batadv_mcast_mla_tt_retract(bat_priv, NULL);
1249         spin_unlock_bh(&bat_priv->tt.commit_lock);
1250 }
1251 
1252 /**
1253  * batadv_mcast_purge_orig - reset originator global mcast state modifications
1254  * @orig: the originator which is going to get purged
1255  */
1256 void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
1257 {
1258         struct batadv_priv *bat_priv = orig->bat_priv;
1259 
1260         spin_lock_bh(&orig->mcast_handler_lock);
1261 
1262         if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) &&
1263             test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized))
1264                 atomic_dec(&bat_priv->mcast.num_disabled);
1265 
1266         batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
1267         batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
1268         batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
1269 
1270         spin_unlock_bh(&orig->mcast_handler_lock);
1271 }
1272 

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