1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2014-2020 B.A.T.M.A.N. contributors:
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>
22 #include <linux/in6.h>
23 #include <linux/inetdevice.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/seq_file.h>
37 #include <linux/skbuff.h>
38 #include <linux/slab.h>
39 #include <linux/spinlock.h>
40 #include <linux/stddef.h>
41 #include <linux/string.h>
42 #include <linux/types.h>
43 #include <linux/workqueue.h>
44 #include <net/addrconf.h>
45 #include <net/genetlink.h>
46 #include <net/if_inet6.h>
49 #include <net/netlink.h>
51 #include <uapi/linux/batadv_packet.h>
52 #include <uapi/linux/batman_adv.h>
54 #include "bridge_loop_avoidance.h"
55 #include "hard-interface.h"
60 #include "soft-interface.h"
61 #include "translation-table.h"
64 static void batadv_mcast_mla_update(struct work_struct *work);
67 * batadv_mcast_start_timer() - schedule the multicast periodic worker
68 * @bat_priv: the bat priv with all the soft interface information
70 static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
72 queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work,
73 msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
77 * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists
78 * @soft_iface: netdev struct of the mesh interface
80 * If the given soft interface has a bridge on top then the refcount
81 * of the according net device is increased.
83 * Return: NULL if no such bridge exists. Otherwise the net device of the
86 static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
88 struct net_device *upper = soft_iface;
92 upper = netdev_master_upper_dev_get_rcu(upper);
93 } while (upper && !(upper->priv_flags & IFF_EBRIDGE));
103 * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from
105 * @dev: the interface to check
107 * Checks the presence of an IPv4 multicast router on this node.
109 * Caller needs to hold rcu read lock.
111 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise.
113 static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev)
115 struct in_device *in_dev = __in_dev_get_rcu(dev);
117 if (in_dev && IN_DEV_MFORWARD(in_dev))
118 return BATADV_NO_FLAGS;
120 return BATADV_MCAST_WANT_NO_RTR4;
124 * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from
126 * @dev: the interface to check
128 * Checks the presence of an IPv6 multicast router on this node.
130 * Caller needs to hold rcu read lock.
132 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise.
134 #if IS_ENABLED(CONFIG_IPV6_MROUTE)
135 static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
137 struct inet6_dev *in6_dev = __in6_dev_get(dev);
139 if (in6_dev && atomic_read(&in6_dev->cnf.mc_forwarding))
140 return BATADV_NO_FLAGS;
142 return BATADV_MCAST_WANT_NO_RTR6;
146 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
148 return BATADV_MCAST_WANT_NO_RTR6;
153 * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node
154 * @bat_priv: the bat priv with all the soft interface information
155 * @bridge: bridge interface on top of the soft_iface if present,
156 * otherwise pass NULL
158 * Checks the presence of IPv4 and IPv6 multicast routers on this
162 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
163 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
164 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
165 * The former two OR'd: no multicast router is present
167 static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv,
168 struct net_device *bridge)
170 struct net_device *dev = bridge ? bridge : bat_priv->soft_iface;
171 u8 flags = BATADV_NO_FLAGS;
175 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev);
176 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev);
184 * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge
185 * @bat_priv: the bat priv with all the soft interface information
186 * @bridge: bridge interface on top of the soft_iface if present,
187 * otherwise pass NULL
189 * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge.
192 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
193 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
194 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
195 * The former two OR'd: no multicast router is present
197 #if IS_ENABLED(CONFIG_IPV6)
198 static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
199 struct net_device *bridge)
201 struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
202 struct net_device *dev = bat_priv->soft_iface;
203 struct br_ip_list *br_ip_entry, *tmp;
204 u8 flags = BATADV_MCAST_WANT_NO_RTR6;
208 return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
210 /* TODO: ask the bridge if a multicast router is present (the bridge
211 * is capable of performing proper RFC4286 multicast router
212 * discovery) instead of searching for a ff02::2 listener here
214 ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
216 return BATADV_NO_FLAGS;
218 list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
219 /* the bridge snooping does not maintain IPv4 link-local
220 * addresses - therefore we won't find any IPv4 multicast router
221 * address here, only IPv6 ones
223 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
224 ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
225 flags &= ~BATADV_MCAST_WANT_NO_RTR6;
227 list_del(&br_ip_entry->list);
235 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
236 struct net_device *bridge)
239 return BATADV_NO_FLAGS;
241 return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
246 * batadv_mcast_mla_rtr_flags_get() - get multicast router flags
247 * @bat_priv: the bat priv with all the soft interface information
248 * @bridge: bridge interface on top of the soft_iface if present,
249 * otherwise pass NULL
251 * Checks the presence of IPv4 and IPv6 multicast routers on this
252 * node or behind its bridge.
255 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
256 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
257 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
258 * The former two OR'd: no multicast router is present
260 static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv,
261 struct net_device *bridge)
263 u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
265 flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge);
266 flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge);
272 * batadv_mcast_mla_flags_get() - get the new multicast flags
273 * @bat_priv: the bat priv with all the soft interface information
275 * Return: A set of flags for the current/next TVLV, querier and
278 static struct batadv_mcast_mla_flags
279 batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv)
281 struct net_device *dev = bat_priv->soft_iface;
282 struct batadv_mcast_querier_state *qr4, *qr6;
283 struct batadv_mcast_mla_flags mla_flags;
284 struct net_device *bridge;
286 bridge = batadv_mcast_get_bridge(dev);
288 memset(&mla_flags, 0, sizeof(mla_flags));
289 mla_flags.enabled = 1;
290 mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv,
298 mla_flags.bridged = 1;
299 qr4 = &mla_flags.querier_ipv4;
300 qr6 = &mla_flags.querier_ipv6;
302 if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
303 pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
305 qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
306 qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
308 qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
309 qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
311 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
313 /* 1) If no querier exists at all, then multicast listeners on
314 * our local TT clients behind the bridge will keep silent.
315 * 2) If the selected querier is on one of our local TT clients,
316 * behind the bridge, then this querier might shadow multicast
317 * listeners on our local TT clients, behind this bridge.
319 * In both cases, we will signalize other batman nodes that
320 * we need all multicast traffic of the according protocol.
322 if (!qr4->exists || qr4->shadowing) {
323 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4;
324 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4;
327 if (!qr6->exists || qr6->shadowing) {
328 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6;
329 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6;
336 * batadv_mcast_mla_is_duplicate() - check whether an address is in a list
337 * @mcast_addr: the multicast address to check
338 * @mcast_list: the list with multicast addresses to search in
340 * Return: true if the given address is already in the given list.
341 * Otherwise returns false.
343 static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
344 struct hlist_head *mcast_list)
346 struct batadv_hw_addr *mcast_entry;
348 hlist_for_each_entry(mcast_entry, mcast_list, list)
349 if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
356 * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners
357 * @dev: the device to collect multicast addresses from
358 * @mcast_list: a list to put found addresses into
359 * @flags: flags indicating the new multicast state
361 * Collects multicast addresses of IPv4 multicast listeners residing
362 * on this kernel on the given soft interface, dev, in
363 * the given mcast_list. In general, multicast listeners provided by
364 * your multicast receiving applications run directly on this node.
366 * Return: -ENOMEM on memory allocation error or the number of
367 * items added to the mcast_list otherwise.
370 batadv_mcast_mla_softif_get_ipv4(struct net_device *dev,
371 struct hlist_head *mcast_list,
372 struct batadv_mcast_mla_flags *flags)
374 struct batadv_hw_addr *new;
375 struct in_device *in_dev;
376 u8 mcast_addr[ETH_ALEN];
377 struct ip_mc_list *pmc;
380 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
385 in_dev = __in_dev_get_rcu(dev);
391 for (pmc = rcu_dereference(in_dev->mc_list); pmc;
392 pmc = rcu_dereference(pmc->next_rcu)) {
393 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
394 ipv4_is_local_multicast(pmc->multiaddr))
397 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
398 !ipv4_is_local_multicast(pmc->multiaddr))
401 ip_eth_mc_map(pmc->multiaddr, mcast_addr);
403 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
406 new = kmalloc(sizeof(*new), GFP_ATOMIC);
412 ether_addr_copy(new->addr, mcast_addr);
413 hlist_add_head(&new->list, mcast_list);
422 * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners
423 * @dev: the device to collect multicast addresses from
424 * @mcast_list: a list to put found addresses into
425 * @flags: flags indicating the new multicast state
427 * Collects multicast addresses of IPv6 multicast listeners residing
428 * on this kernel on the given soft interface, dev, in
429 * the given mcast_list. In general, multicast listeners provided by
430 * your multicast receiving applications run directly on this node.
432 * Return: -ENOMEM on memory allocation error or the number of
433 * items added to the mcast_list otherwise.
435 #if IS_ENABLED(CONFIG_IPV6)
437 batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
438 struct hlist_head *mcast_list,
439 struct batadv_mcast_mla_flags *flags)
441 struct batadv_hw_addr *new;
442 struct inet6_dev *in6_dev;
443 u8 mcast_addr[ETH_ALEN];
444 struct ifmcaddr6 *pmc6;
447 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
452 in6_dev = __in6_dev_get(dev);
458 read_lock_bh(&in6_dev->lock);
459 for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) {
460 if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
461 IPV6_ADDR_SCOPE_LINKLOCAL)
464 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
465 ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr))
468 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
469 IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) >
470 IPV6_ADDR_SCOPE_LINKLOCAL)
473 ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr);
475 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
478 new = kmalloc(sizeof(*new), GFP_ATOMIC);
484 ether_addr_copy(new->addr, mcast_addr);
485 hlist_add_head(&new->list, mcast_list);
488 read_unlock_bh(&in6_dev->lock);
495 batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
496 struct hlist_head *mcast_list,
497 struct batadv_mcast_mla_flags *flags)
504 * batadv_mcast_mla_softif_get() - get softif multicast listeners
505 * @dev: the device to collect multicast addresses from
506 * @mcast_list: a list to put found addresses into
507 * @flags: flags indicating the new multicast state
509 * Collects multicast addresses of multicast listeners residing
510 * on this kernel on the given soft interface, dev, in
511 * the given mcast_list. In general, multicast listeners provided by
512 * your multicast receiving applications run directly on this node.
514 * If there is a bridge interface on top of dev, collect from that one
515 * instead. Just like with IP addresses and routes, multicast listeners
516 * will(/should) register to the bridge interface instead of an
519 * Return: -ENOMEM on memory allocation error or the number of
520 * items added to the mcast_list otherwise.
523 batadv_mcast_mla_softif_get(struct net_device *dev,
524 struct hlist_head *mcast_list,
525 struct batadv_mcast_mla_flags *flags)
527 struct net_device *bridge = batadv_mcast_get_bridge(dev);
533 ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags);
537 ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags);
551 * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address
552 * @dst: destination to write to - a multicast MAC address
553 * @src: source to read from - a multicast IP address
555 * Converts a given multicast IPv4/IPv6 address from a bridge
556 * to its matching multicast MAC address and copies it into the given
557 * destination buffer.
559 * Caller needs to make sure the destination buffer can hold
560 * at least ETH_ALEN bytes.
562 static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
564 if (src->proto == htons(ETH_P_IP))
565 ip_eth_mc_map(src->dst.ip4, dst);
566 #if IS_ENABLED(CONFIG_IPV6)
567 else if (src->proto == htons(ETH_P_IPV6))
568 ipv6_eth_mc_map(&src->dst.ip6, dst);
575 * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
576 * @dev: a bridge slave whose bridge to collect multicast addresses from
577 * @mcast_list: a list to put found addresses into
578 * @flags: flags indicating the new multicast state
580 * Collects multicast addresses of multicast listeners residing
581 * on foreign, non-mesh devices which we gave access to our mesh via
582 * a bridge on top of the given soft interface, dev, in the given
585 * Return: -ENOMEM on memory allocation error or the number of
586 * items added to the mcast_list otherwise.
588 static int batadv_mcast_mla_bridge_get(struct net_device *dev,
589 struct hlist_head *mcast_list,
590 struct batadv_mcast_mla_flags *flags)
592 struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
593 struct br_ip_list *br_ip_entry, *tmp;
594 u8 tvlv_flags = flags->tvlv_flags;
595 struct batadv_hw_addr *new;
596 u8 mcast_addr[ETH_ALEN];
599 /* we don't need to detect these devices/listeners, the IGMP/MLD
600 * snooping code of the Linux bridge already does that for us
602 ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
606 list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
607 if (br_ip_entry->addr.proto == htons(ETH_P_IP)) {
608 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
611 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
612 ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
615 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
616 !ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
620 #if IS_ENABLED(CONFIG_IPV6)
621 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) {
622 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
625 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
626 ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.dst.ip6))
629 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
630 IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) >
631 IPV6_ADDR_SCOPE_LINKLOCAL)
636 batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
637 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
640 new = kmalloc(sizeof(*new), GFP_ATOMIC);
646 ether_addr_copy(new->addr, mcast_addr);
647 hlist_add_head(&new->list, mcast_list);
651 list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
652 list_del(&br_ip_entry->list);
660 * batadv_mcast_mla_list_free() - free a list of multicast addresses
661 * @mcast_list: the list to free
663 * Removes and frees all items in the given mcast_list.
665 static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
667 struct batadv_hw_addr *mcast_entry;
668 struct hlist_node *tmp;
670 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
671 hlist_del(&mcast_entry->list);
677 * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements
678 * @bat_priv: the bat priv with all the soft interface information
679 * @mcast_list: a list of addresses which should _not_ be removed
681 * Retracts the announcement of any multicast listener from the
682 * translation table except the ones listed in the given mcast_list.
684 * If mcast_list is NULL then all are retracted.
686 static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
687 struct hlist_head *mcast_list)
689 struct batadv_hw_addr *mcast_entry;
690 struct hlist_node *tmp;
692 hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
695 batadv_mcast_mla_is_duplicate(mcast_entry->addr,
699 batadv_tt_local_remove(bat_priv, mcast_entry->addr,
701 "mcast TT outdated", false);
703 hlist_del(&mcast_entry->list);
709 * batadv_mcast_mla_tt_add() - add multicast listener announcements
710 * @bat_priv: the bat priv with all the soft interface information
711 * @mcast_list: a list of addresses which are going to get added
713 * Adds multicast listener announcements from the given mcast_list to the
714 * translation table if they have not been added yet.
716 static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
717 struct hlist_head *mcast_list)
719 struct batadv_hw_addr *mcast_entry;
720 struct hlist_node *tmp;
725 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
726 if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
727 &bat_priv->mcast.mla_list))
730 if (!batadv_tt_local_add(bat_priv->soft_iface,
731 mcast_entry->addr, BATADV_NO_FLAGS,
732 BATADV_NULL_IFINDEX, BATADV_NO_MARK))
735 hlist_del(&mcast_entry->list);
736 hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
741 * batadv_mcast_querier_log() - debug output regarding the querier status on
743 * @bat_priv: the bat priv with all the soft interface information
744 * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
745 * @old_state: the previous querier state on our link
746 * @new_state: the new querier state on our link
748 * Outputs debug messages to the logging facility with log level 'mcast'
749 * regarding changes to the querier status on the link which are relevant
750 * to our multicast optimizations.
752 * Usually this is about whether a querier appeared or vanished in
753 * our mesh or whether the querier is in the suboptimal position of being
754 * behind our local bridge segment: Snooping switches will directly
755 * forward listener reports to the querier, therefore batman-adv and
756 * the bridge will potentially not see these listeners - the querier is
757 * potentially shadowing listeners from us then.
759 * This is only interesting for nodes with a bridge on top of their
763 batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
764 struct batadv_mcast_querier_state *old_state,
765 struct batadv_mcast_querier_state *new_state)
767 if (!old_state->exists && new_state->exists)
768 batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
770 else if (old_state->exists && !new_state->exists)
771 batadv_info(bat_priv->soft_iface,
772 "%s Querier disappeared - multicast optimizations disabled\n",
774 else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists)
775 batadv_info(bat_priv->soft_iface,
776 "No %s Querier present - multicast optimizations disabled\n",
779 if (new_state->exists) {
780 if ((!old_state->shadowing && new_state->shadowing) ||
781 (!old_state->exists && new_state->shadowing))
782 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
783 "%s Querier is behind our bridged segment: Might shadow listeners\n",
785 else if (old_state->shadowing && !new_state->shadowing)
786 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
787 "%s Querier is not behind our bridged segment\n",
793 * batadv_mcast_bridge_log() - debug output for topology changes in bridged
795 * @bat_priv: the bat priv with all the soft interface information
796 * @new_flags: flags indicating the new multicast state
798 * If no bridges are ever used on this node, then this function does nothing.
800 * Otherwise this function outputs debug information to the 'mcast' log level
801 * which might be relevant to our multicast optimizations.
803 * More precisely, it outputs information when a bridge interface is added or
804 * removed from a soft interface. And when a bridge is present, it further
805 * outputs information about the querier state which is relevant for the
806 * multicast flags this node is going to set.
809 batadv_mcast_bridge_log(struct batadv_priv *bat_priv,
810 struct batadv_mcast_mla_flags *new_flags)
812 struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags;
814 if (!old_flags->bridged && new_flags->bridged)
815 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
816 "Bridge added: Setting Unsnoopables(U)-flag\n");
817 else if (old_flags->bridged && !new_flags->bridged)
818 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
819 "Bridge removed: Unsetting Unsnoopables(U)-flag\n");
821 if (new_flags->bridged) {
822 batadv_mcast_querier_log(bat_priv, "IGMP",
823 &old_flags->querier_ipv4,
824 &new_flags->querier_ipv4);
825 batadv_mcast_querier_log(bat_priv, "MLD",
826 &old_flags->querier_ipv6,
827 &new_flags->querier_ipv6);
832 * batadv_mcast_flags_logs() - output debug information about mcast flag changes
833 * @bat_priv: the bat priv with all the soft interface information
834 * @flags: TVLV flags indicating the new multicast state
836 * Whenever the multicast TVLV flags this node announces change, this function
837 * should be used to notify userspace about the change.
839 static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
841 bool old_enabled = bat_priv->mcast.mla_flags.enabled;
842 u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags;
843 char str_old_flags[] = "[.... . ]";
845 sprintf(str_old_flags, "[%c%c%c%s%s]",
846 (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
847 (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
848 (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
849 !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
850 !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
852 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
853 "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n",
854 old_enabled ? str_old_flags : "<undefined>",
855 (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
856 (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
857 (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
858 !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
859 !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
863 * batadv_mcast_mla_flags_update() - update multicast flags
864 * @bat_priv: the bat priv with all the soft interface information
865 * @flags: flags indicating the new multicast state
867 * Updates the own multicast tvlv with our current multicast related settings,
868 * capabilities and inabilities.
871 batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv,
872 struct batadv_mcast_mla_flags *flags)
874 struct batadv_tvlv_mcast_data mcast_data;
876 if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags)))
879 batadv_mcast_bridge_log(bat_priv, flags);
880 batadv_mcast_flags_log(bat_priv, flags->tvlv_flags);
882 mcast_data.flags = flags->tvlv_flags;
883 memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
885 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
886 &mcast_data, sizeof(mcast_data));
888 bat_priv->mcast.mla_flags = *flags;
892 * __batadv_mcast_mla_update() - update the own MLAs
893 * @bat_priv: the bat priv with all the soft interface information
895 * Updates the own multicast listener announcements in the translation
896 * table as well as the own, announced multicast tvlv container.
898 * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
899 * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
900 * ensured by the non-parallel execution of the worker this function
903 static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
905 struct net_device *soft_iface = bat_priv->soft_iface;
906 struct hlist_head mcast_list = HLIST_HEAD_INIT;
907 struct batadv_mcast_mla_flags flags;
910 flags = batadv_mcast_mla_flags_get(bat_priv);
912 ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags);
916 ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags);
920 spin_lock(&bat_priv->mcast.mla_lock);
921 batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
922 batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
923 batadv_mcast_mla_flags_update(bat_priv, &flags);
924 spin_unlock(&bat_priv->mcast.mla_lock);
927 batadv_mcast_mla_list_free(&mcast_list);
931 * batadv_mcast_mla_update() - update the own MLAs
932 * @work: kernel work struct
934 * Updates the own multicast listener announcements in the translation
935 * table as well as the own, announced multicast tvlv container.
937 * In the end, reschedules the work timer.
939 static void batadv_mcast_mla_update(struct work_struct *work)
941 struct delayed_work *delayed_work;
942 struct batadv_priv_mcast *priv_mcast;
943 struct batadv_priv *bat_priv;
945 delayed_work = to_delayed_work(work);
946 priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
947 bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
949 __batadv_mcast_mla_update(bat_priv);
950 batadv_mcast_start_timer(bat_priv);
954 * batadv_mcast_is_report_ipv4() - check for IGMP reports
955 * @skb: the ethernet frame destined for the mesh
957 * This call might reallocate skb data.
959 * Checks whether the given frame is a valid IGMP report.
961 * Return: If so then true, otherwise false.
963 static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
965 if (ip_mc_check_igmp(skb) < 0)
968 switch (igmp_hdr(skb)->type) {
969 case IGMP_HOST_MEMBERSHIP_REPORT:
970 case IGMPV2_HOST_MEMBERSHIP_REPORT:
971 case IGMPV3_HOST_MEMBERSHIP_REPORT:
979 * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding
981 * @bat_priv: the bat priv with all the soft interface information
982 * @skb: the IPv4 packet to check
983 * @is_unsnoopable: stores whether the destination is snoopable
984 * @is_routable: stores whether the destination is routable
986 * Checks whether the given IPv4 packet has the potential to be forwarded with a
987 * mode more optimal than classic flooding.
989 * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
990 * allocation failure.
992 static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
994 bool *is_unsnoopable,
999 /* We might fail due to out-of-memory -> drop it */
1000 if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
1003 if (batadv_mcast_is_report_ipv4(skb))
1006 iphdr = ip_hdr(skb);
1008 /* link-local multicast listeners behind a bridge are
1009 * not snoopable (see RFC4541, section 2.1.2.2)
1011 if (ipv4_is_local_multicast(iphdr->daddr))
1012 *is_unsnoopable = true;
1014 *is_routable = ETH_P_IP;
1020 * batadv_mcast_is_report_ipv6() - check for MLD reports
1021 * @skb: the ethernet frame destined for the mesh
1023 * This call might reallocate skb data.
1025 * Checks whether the given frame is a valid MLD report.
1027 * Return: If so then true, otherwise false.
1029 static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
1031 if (ipv6_mc_check_mld(skb) < 0)
1034 switch (icmp6_hdr(skb)->icmp6_type) {
1035 case ICMPV6_MGM_REPORT:
1036 case ICMPV6_MLD2_REPORT:
1044 * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding
1046 * @bat_priv: the bat priv with all the soft interface information
1047 * @skb: the IPv6 packet to check
1048 * @is_unsnoopable: stores whether the destination is snoopable
1049 * @is_routable: stores whether the destination is routable
1051 * Checks whether the given IPv6 packet has the potential to be forwarded with a
1052 * mode more optimal than classic flooding.
1054 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1056 static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
1057 struct sk_buff *skb,
1058 bool *is_unsnoopable,
1061 struct ipv6hdr *ip6hdr;
1063 /* We might fail due to out-of-memory -> drop it */
1064 if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
1067 if (batadv_mcast_is_report_ipv6(skb))
1070 ip6hdr = ipv6_hdr(skb);
1072 if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075 /* link-local-all-nodes multicast listeners behind a bridge are
1076 * not snoopable (see RFC4541, section 3, paragraph 3)
1078 if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
1079 *is_unsnoopable = true;
1080 else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL)
1081 *is_routable = ETH_P_IPV6;
1087 * batadv_mcast_forw_mode_check() - check for optimized forwarding potential
1088 * @bat_priv: the bat priv with all the soft interface information
1089 * @skb: the multicast frame to check
1090 * @is_unsnoopable: stores whether the destination is snoopable
1091 * @is_routable: stores whether the destination is routable
1093 * Checks whether the given multicast ethernet frame has the potential to be
1094 * forwarded with a mode more optimal than classic flooding.
1096 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1098 static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
1099 struct sk_buff *skb,
1100 bool *is_unsnoopable,
1103 struct ethhdr *ethhdr = eth_hdr(skb);
1105 if (!atomic_read(&bat_priv->multicast_mode))
1108 switch (ntohs(ethhdr->h_proto)) {
1110 return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
1114 if (!IS_ENABLED(CONFIG_IPV6))
1117 return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
1126 * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast
1128 * @bat_priv: the bat priv with all the soft interface information
1129 * @ethhdr: ethernet header of a packet
1131 * Return: the number of nodes which want all IPv4 multicast traffic if the
1132 * given ethhdr is from an IPv4 packet or the number of nodes which want all
1133 * IPv6 traffic if it matches an IPv6 packet.
1135 static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
1136 struct ethhdr *ethhdr)
1138 switch (ntohs(ethhdr->h_proto)) {
1140 return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
1142 return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
1144 /* we shouldn't be here... */
1150 * batadv_mcast_forw_rtr_count() - count nodes with a multicast router
1151 * @bat_priv: the bat priv with all the soft interface information
1152 * @protocol: the ethernet protocol type to count multicast routers for
1154 * Return: the number of nodes which want all routable IPv4 multicast traffic
1155 * if the protocol is ETH_P_IP or the number of nodes which want all routable
1156 * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0.
1159 static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv,
1164 return atomic_read(&bat_priv->mcast.num_want_all_rtr4);
1166 return atomic_read(&bat_priv->mcast.num_want_all_rtr6);
1173 * batadv_mcast_forw_tt_node_get() - get a multicast tt node
1174 * @bat_priv: the bat priv with all the soft interface information
1175 * @ethhdr: the ether header containing the multicast destination
1177 * Return: an orig_node matching the multicast address provided by ethhdr
1178 * via a translation table lookup. This increases the returned nodes refcount.
1180 static struct batadv_orig_node *
1181 batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
1182 struct ethhdr *ethhdr)
1184 return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest,
1189 * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag
1190 * @bat_priv: the bat priv with all the soft interface information
1192 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
1193 * increases its refcount.
1195 static struct batadv_orig_node *
1196 batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
1198 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1201 hlist_for_each_entry_rcu(tmp_orig_node,
1202 &bat_priv->mcast.want_all_ipv4_list,
1203 mcast_want_all_ipv4_node) {
1204 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1207 orig_node = tmp_orig_node;
1216 * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag
1217 * @bat_priv: the bat priv with all the soft interface information
1219 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
1220 * and increases its refcount.
1222 static struct batadv_orig_node *
1223 batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
1225 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1228 hlist_for_each_entry_rcu(tmp_orig_node,
1229 &bat_priv->mcast.want_all_ipv6_list,
1230 mcast_want_all_ipv6_node) {
1231 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1234 orig_node = tmp_orig_node;
1243 * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag
1244 * @bat_priv: the bat priv with all the soft interface information
1245 * @ethhdr: an ethernet header to determine the protocol family from
1247 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
1248 * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, sets and
1249 * increases its refcount.
1251 static struct batadv_orig_node *
1252 batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
1253 struct ethhdr *ethhdr)
1255 switch (ntohs(ethhdr->h_proto)) {
1257 return batadv_mcast_forw_ipv4_node_get(bat_priv);
1259 return batadv_mcast_forw_ipv6_node_get(bat_priv);
1261 /* we shouldn't be here... */
1267 * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag
1268 * @bat_priv: the bat priv with all the soft interface information
1270 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
1271 * set and increases its refcount.
1273 static struct batadv_orig_node *
1274 batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
1276 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1279 hlist_for_each_entry_rcu(tmp_orig_node,
1280 &bat_priv->mcast.want_all_unsnoopables_list,
1281 mcast_want_all_unsnoopables_node) {
1282 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1285 orig_node = tmp_orig_node;
1294 * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag
1295 * @bat_priv: the bat priv with all the soft interface information
1297 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and
1298 * increases its refcount.
1300 static struct batadv_orig_node *
1301 batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv)
1303 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1306 hlist_for_each_entry_rcu(tmp_orig_node,
1307 &bat_priv->mcast.want_all_rtr4_list,
1308 mcast_want_all_rtr4_node) {
1309 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1312 orig_node = tmp_orig_node;
1321 * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag
1322 * @bat_priv: the bat priv with all the soft interface information
1324 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset
1325 * and increases its refcount.
1327 static struct batadv_orig_node *
1328 batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv)
1330 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
1333 hlist_for_each_entry_rcu(tmp_orig_node,
1334 &bat_priv->mcast.want_all_rtr6_list,
1335 mcast_want_all_rtr6_node) {
1336 if (!kref_get_unless_zero(&tmp_orig_node->refcount))
1339 orig_node = tmp_orig_node;
1348 * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag
1349 * @bat_priv: the bat priv with all the soft interface information
1350 * @ethhdr: an ethernet header to determine the protocol family from
1352 * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or
1353 * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and
1354 * increases its refcount.
1356 static struct batadv_orig_node *
1357 batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv,
1358 struct ethhdr *ethhdr)
1360 switch (ntohs(ethhdr->h_proto)) {
1362 return batadv_mcast_forw_rtr4_node_get(bat_priv);
1364 return batadv_mcast_forw_rtr6_node_get(bat_priv);
1366 /* we shouldn't be here... */
1372 * batadv_mcast_forw_mode() - check on how to forward a multicast packet
1373 * @bat_priv: the bat priv with all the soft interface information
1374 * @skb: The multicast packet to check
1375 * @orig: an originator to be set to forward the skb to
1376 * @is_routable: stores whether the destination is routable
1378 * Return: the forwarding mode as enum batadv_forw_mode and in case of
1379 * BATADV_FORW_SINGLE set the orig to the single originator the skb
1380 * should be forwarded to.
1382 enum batadv_forw_mode
1383 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
1384 struct batadv_orig_node **orig, int *is_routable)
1386 int ret, tt_count, ip_count, unsnoop_count, total_count;
1387 bool is_unsnoopable = false;
1388 unsigned int mcast_fanout;
1389 struct ethhdr *ethhdr;
1392 ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable,
1395 return BATADV_FORW_NONE;
1397 return BATADV_FORW_ALL;
1399 ethhdr = eth_hdr(skb);
1401 tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
1403 ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
1404 unsnoop_count = !is_unsnoopable ? 0 :
1405 atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
1406 rtr_count = batadv_mcast_forw_rtr_count(bat_priv, *is_routable);
1408 total_count = tt_count + ip_count + unsnoop_count + rtr_count;
1410 switch (total_count) {
1413 *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
1415 *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
1416 else if (unsnoop_count)
1417 *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
1419 *orig = batadv_mcast_forw_rtr_node_get(bat_priv,
1423 return BATADV_FORW_SINGLE;
1427 return BATADV_FORW_NONE;
1429 mcast_fanout = atomic_read(&bat_priv->multicast_fanout);
1431 if (!unsnoop_count && total_count <= mcast_fanout)
1432 return BATADV_FORW_SOME;
1435 return BATADV_FORW_ALL;
1439 * batadv_mcast_forw_send_orig() - send a multicast packet to an originator
1440 * @bat_priv: the bat priv with all the soft interface information
1441 * @skb: the multicast packet to send
1442 * @vid: the vlan identifier
1443 * @orig_node: the originator to send the packet to
1445 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
1447 int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
1448 struct sk_buff *skb,
1450 struct batadv_orig_node *orig_node)
1452 /* Avoid sending multicast-in-unicast packets to other BLA
1453 * gateways - they already got the frame from the LAN side
1454 * we share with them.
1455 * TODO: Refactor to take BLA into account earlier, to avoid
1456 * reducing the mcast_fanout count.
1458 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) {
1460 return NET_XMIT_SUCCESS;
1463 return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
1468 * batadv_mcast_forw_tt() - forwards a packet to multicast listeners
1469 * @bat_priv: the bat priv with all the soft interface information
1470 * @skb: the multicast packet to transmit
1471 * @vid: the vlan identifier
1473 * Sends copies of a frame with multicast destination to any multicast
1474 * listener registered in the translation table. A transmission is performed
1475 * via a batman-adv unicast packet for each such destination node.
1477 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1481 batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb,
1484 int ret = NET_XMIT_SUCCESS;
1485 struct sk_buff *newskb;
1487 struct batadv_tt_orig_list_entry *orig_entry;
1489 struct batadv_tt_global_entry *tt_global;
1490 const u8 *addr = eth_hdr(skb)->h_dest;
1492 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
1497 hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) {
1498 newskb = skb_copy(skb, GFP_ATOMIC);
1500 ret = NET_XMIT_DROP;
1504 batadv_mcast_forw_send_orig(bat_priv, newskb, vid,
1505 orig_entry->orig_node);
1509 batadv_tt_global_entry_put(tt_global);
1516 * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4
1517 * @bat_priv: the bat priv with all the soft interface information
1518 * @skb: the multicast packet to transmit
1519 * @vid: the vlan identifier
1521 * Sends copies of a frame with multicast destination to any node with a
1522 * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a
1523 * batman-adv unicast packet for each such destination node.
1525 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1529 batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv,
1530 struct sk_buff *skb, unsigned short vid)
1532 struct batadv_orig_node *orig_node;
1533 int ret = NET_XMIT_SUCCESS;
1534 struct sk_buff *newskb;
1537 hlist_for_each_entry_rcu(orig_node,
1538 &bat_priv->mcast.want_all_ipv4_list,
1539 mcast_want_all_ipv4_node) {
1540 newskb = skb_copy(skb, GFP_ATOMIC);
1542 ret = NET_XMIT_DROP;
1546 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1553 * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6
1554 * @bat_priv: the bat priv with all the soft interface information
1555 * @skb: The multicast packet to transmit
1556 * @vid: the vlan identifier
1558 * Sends copies of a frame with multicast destination to any node with a
1559 * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a
1560 * batman-adv unicast packet for each such destination node.
1562 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1566 batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv,
1567 struct sk_buff *skb, unsigned short vid)
1569 struct batadv_orig_node *orig_node;
1570 int ret = NET_XMIT_SUCCESS;
1571 struct sk_buff *newskb;
1574 hlist_for_each_entry_rcu(orig_node,
1575 &bat_priv->mcast.want_all_ipv6_list,
1576 mcast_want_all_ipv6_node) {
1577 newskb = skb_copy(skb, GFP_ATOMIC);
1579 ret = NET_XMIT_DROP;
1583 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1590 * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list
1591 * @bat_priv: the bat priv with all the soft interface information
1592 * @skb: the multicast packet to transmit
1593 * @vid: the vlan identifier
1595 * Sends copies of a frame with multicast destination to any node with a
1596 * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A
1597 * transmission is performed via a batman-adv unicast packet for each such
1600 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1601 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1604 batadv_mcast_forw_want_all(struct batadv_priv *bat_priv,
1605 struct sk_buff *skb, unsigned short vid)
1607 switch (ntohs(eth_hdr(skb)->h_proto)) {
1609 return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid);
1611 return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid);
1613 /* we shouldn't be here... */
1614 return NET_XMIT_DROP;
1619 * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4
1620 * @bat_priv: the bat priv with all the soft interface information
1621 * @skb: the multicast packet to transmit
1622 * @vid: the vlan identifier
1624 * Sends copies of a frame with multicast destination to any node with a
1625 * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a
1626 * batman-adv unicast packet for each such destination node.
1628 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1632 batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv,
1633 struct sk_buff *skb, unsigned short vid)
1635 struct batadv_orig_node *orig_node;
1636 int ret = NET_XMIT_SUCCESS;
1637 struct sk_buff *newskb;
1640 hlist_for_each_entry_rcu(orig_node,
1641 &bat_priv->mcast.want_all_rtr4_list,
1642 mcast_want_all_rtr4_node) {
1643 newskb = skb_copy(skb, GFP_ATOMIC);
1645 ret = NET_XMIT_DROP;
1649 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1656 * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6
1657 * @bat_priv: the bat priv with all the soft interface information
1658 * @skb: The multicast packet to transmit
1659 * @vid: the vlan identifier
1661 * Sends copies of a frame with multicast destination to any node with a
1662 * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a
1663 * batman-adv unicast packet for each such destination node.
1665 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1669 batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv,
1670 struct sk_buff *skb, unsigned short vid)
1672 struct batadv_orig_node *orig_node;
1673 int ret = NET_XMIT_SUCCESS;
1674 struct sk_buff *newskb;
1677 hlist_for_each_entry_rcu(orig_node,
1678 &bat_priv->mcast.want_all_rtr6_list,
1679 mcast_want_all_rtr6_node) {
1680 newskb = skb_copy(skb, GFP_ATOMIC);
1682 ret = NET_XMIT_DROP;
1686 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node);
1693 * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list
1694 * @bat_priv: the bat priv with all the soft interface information
1695 * @skb: the multicast packet to transmit
1696 * @vid: the vlan identifier
1698 * Sends copies of a frame with multicast destination to any node with a
1699 * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A
1700 * transmission is performed via a batman-adv unicast packet for each such
1703 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1704 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1707 batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv,
1708 struct sk_buff *skb, unsigned short vid)
1710 switch (ntohs(eth_hdr(skb)->h_proto)) {
1712 return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid);
1714 return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid);
1716 /* we shouldn't be here... */
1717 return NET_XMIT_DROP;
1722 * batadv_mcast_forw_send() - send packet to any detected multicast recipient
1723 * @bat_priv: the bat priv with all the soft interface information
1724 * @skb: the multicast packet to transmit
1725 * @vid: the vlan identifier
1726 * @is_routable: stores whether the destination is routable
1728 * Sends copies of a frame with multicast destination to any node that signaled
1729 * interest in it, that is either via the translation table or the according
1730 * want-all flags. A transmission is performed via a batman-adv unicast packet
1731 * for each such destination node.
1733 * The given skb is consumed/freed.
1735 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1736 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1738 int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
1739 unsigned short vid, int is_routable)
1743 ret = batadv_mcast_forw_tt(bat_priv, skb, vid);
1744 if (ret != NET_XMIT_SUCCESS) {
1749 ret = batadv_mcast_forw_want_all(bat_priv, skb, vid);
1750 if (ret != NET_XMIT_SUCCESS) {
1756 goto skip_mc_router;
1758 ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid);
1759 if (ret != NET_XMIT_SUCCESS) {
1770 * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list
1771 * @bat_priv: the bat priv with all the soft interface information
1772 * @orig: the orig_node which multicast state might have changed of
1773 * @mcast_flags: flags indicating the new multicast state
1775 * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
1776 * orig, has toggled then this method updates the counter and the list
1779 * Caller needs to hold orig->mcast_handler_lock.
1781 static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
1782 struct batadv_orig_node *orig,
1785 struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
1786 struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
1788 lockdep_assert_held(&orig->mcast_handler_lock);
1790 /* switched from flag unset to set */
1791 if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
1792 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
1793 atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
1795 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1796 /* flag checks above + mcast_handler_lock prevents this */
1797 WARN_ON(!hlist_unhashed(node));
1799 hlist_add_head_rcu(node, head);
1800 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1801 /* switched from flag set to unset */
1802 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
1803 orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
1804 atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
1806 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1807 /* flag checks above + mcast_handler_lock prevents this */
1808 WARN_ON(hlist_unhashed(node));
1810 hlist_del_init_rcu(node);
1811 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1816 * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list
1817 * @bat_priv: the bat priv with all the soft interface information
1818 * @orig: the orig_node which multicast state might have changed of
1819 * @mcast_flags: flags indicating the new multicast state
1821 * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
1822 * toggled then this method updates the counter and the list accordingly.
1824 * Caller needs to hold orig->mcast_handler_lock.
1826 static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
1827 struct batadv_orig_node *orig,
1830 struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
1831 struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
1833 lockdep_assert_held(&orig->mcast_handler_lock);
1835 /* switched from flag unset to set */
1836 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
1837 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
1838 atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
1840 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1841 /* flag checks above + mcast_handler_lock prevents this */
1842 WARN_ON(!hlist_unhashed(node));
1844 hlist_add_head_rcu(node, head);
1845 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1846 /* switched from flag set to unset */
1847 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
1848 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
1849 atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
1851 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1852 /* flag checks above + mcast_handler_lock prevents this */
1853 WARN_ON(hlist_unhashed(node));
1855 hlist_del_init_rcu(node);
1856 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1861 * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list
1862 * @bat_priv: the bat priv with all the soft interface information
1863 * @orig: the orig_node which multicast state might have changed of
1864 * @mcast_flags: flags indicating the new multicast state
1866 * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
1867 * toggled then this method updates the counter and the list accordingly.
1869 * Caller needs to hold orig->mcast_handler_lock.
1871 static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
1872 struct batadv_orig_node *orig,
1875 struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
1876 struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
1878 lockdep_assert_held(&orig->mcast_handler_lock);
1880 /* switched from flag unset to set */
1881 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
1882 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
1883 atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
1885 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1886 /* flag checks above + mcast_handler_lock prevents this */
1887 WARN_ON(!hlist_unhashed(node));
1889 hlist_add_head_rcu(node, head);
1890 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1891 /* switched from flag set to unset */
1892 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
1893 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
1894 atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
1896 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1897 /* flag checks above + mcast_handler_lock prevents this */
1898 WARN_ON(hlist_unhashed(node));
1900 hlist_del_init_rcu(node);
1901 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1906 * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list
1907 * @bat_priv: the bat priv with all the soft interface information
1908 * @orig: the orig_node which multicast state might have changed of
1909 * @mcast_flags: flags indicating the new multicast state
1911 * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has
1912 * toggled then this method updates the counter and the list accordingly.
1914 * Caller needs to hold orig->mcast_handler_lock.
1916 static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv,
1917 struct batadv_orig_node *orig,
1920 struct hlist_node *node = &orig->mcast_want_all_rtr4_node;
1921 struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list;
1923 lockdep_assert_held(&orig->mcast_handler_lock);
1925 /* switched from flag set to unset */
1926 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) &&
1927 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) {
1928 atomic_inc(&bat_priv->mcast.num_want_all_rtr4);
1930 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1931 /* flag checks above + mcast_handler_lock prevents this */
1932 WARN_ON(!hlist_unhashed(node));
1934 hlist_add_head_rcu(node, head);
1935 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1936 /* switched from flag unset to set */
1937 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 &&
1938 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) {
1939 atomic_dec(&bat_priv->mcast.num_want_all_rtr4);
1941 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1942 /* flag checks above + mcast_handler_lock prevents this */
1943 WARN_ON(hlist_unhashed(node));
1945 hlist_del_init_rcu(node);
1946 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1951 * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list
1952 * @bat_priv: the bat priv with all the soft interface information
1953 * @orig: the orig_node which multicast state might have changed of
1954 * @mcast_flags: flags indicating the new multicast state
1956 * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has
1957 * toggled then this method updates the counter and the list accordingly.
1959 * Caller needs to hold orig->mcast_handler_lock.
1961 static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv,
1962 struct batadv_orig_node *orig,
1965 struct hlist_node *node = &orig->mcast_want_all_rtr6_node;
1966 struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list;
1968 lockdep_assert_held(&orig->mcast_handler_lock);
1970 /* switched from flag set to unset */
1971 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) &&
1972 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) {
1973 atomic_inc(&bat_priv->mcast.num_want_all_rtr6);
1975 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1976 /* flag checks above + mcast_handler_lock prevents this */
1977 WARN_ON(!hlist_unhashed(node));
1979 hlist_add_head_rcu(node, head);
1980 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1981 /* switched from flag unset to set */
1982 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 &&
1983 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) {
1984 atomic_dec(&bat_priv->mcast.num_want_all_rtr6);
1986 spin_lock_bh(&bat_priv->mcast.want_lists_lock);
1987 /* flag checks above + mcast_handler_lock prevents this */
1988 WARN_ON(hlist_unhashed(node));
1990 hlist_del_init_rcu(node);
1991 spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
1996 * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV
1997 * @enabled: whether the originator has multicast TVLV support enabled
1998 * @tvlv_value: tvlv buffer containing the multicast flags
1999 * @tvlv_value_len: tvlv buffer length
2001 * Return: multicast flags for the given tvlv buffer
2004 batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len)
2006 u8 mcast_flags = BATADV_NO_FLAGS;
2008 if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags))
2009 mcast_flags = *(u8 *)tvlv_value;
2012 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4;
2013 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6;
2016 /* remove redundant flags to avoid sending duplicate packets later */
2017 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)
2018 mcast_flags |= BATADV_MCAST_WANT_NO_RTR4;
2020 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)
2021 mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
2027 * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container
2028 * @bat_priv: the bat priv with all the soft interface information
2029 * @orig: the orig_node of the ogm
2030 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
2031 * @tvlv_value: tvlv buffer containing the multicast data
2032 * @tvlv_value_len: tvlv buffer length
2034 static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
2035 struct batadv_orig_node *orig,
2040 bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
2043 mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled,
2044 tvlv_value, tvlv_value_len);
2046 spin_lock_bh(&orig->mcast_handler_lock);
2048 if (orig_mcast_enabled &&
2049 !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
2050 set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
2051 } else if (!orig_mcast_enabled &&
2052 test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
2053 clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
2056 set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
2058 batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
2059 batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
2060 batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
2061 batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags);
2062 batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags);
2064 orig->mcast_flags = mcast_flags;
2065 spin_unlock_bh(&orig->mcast_handler_lock);
2069 * batadv_mcast_init() - initialize the multicast optimizations structures
2070 * @bat_priv: the bat priv with all the soft interface information
2072 void batadv_mcast_init(struct batadv_priv *bat_priv)
2074 batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
2075 NULL, BATADV_TVLV_MCAST, 2,
2076 BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
2078 INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
2079 batadv_mcast_start_timer(bat_priv);
2082 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2084 * batadv_mcast_flags_print_header() - print own mcast flags to debugfs table
2085 * @bat_priv: the bat priv with all the soft interface information
2086 * @seq: debugfs table seq_file struct
2088 * Prints our own multicast flags including a more specific reason why
2089 * they are set, that is prints the bridge and querier state too, to
2090 * the debugfs table specified via @seq.
2092 static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv,
2093 struct seq_file *seq)
2095 struct batadv_mcast_mla_flags *mla_flags = &bat_priv->mcast.mla_flags;
2096 char querier4, querier6, shadowing4, shadowing6;
2097 bool bridged = mla_flags->bridged;
2098 u8 flags = mla_flags->tvlv_flags;
2101 querier4 = mla_flags->querier_ipv4.exists ? '.' : '4';
2102 querier6 = mla_flags->querier_ipv6.exists ? '.' : '6';
2103 shadowing4 = mla_flags->querier_ipv4.shadowing ? '4' : '.';
2104 shadowing6 = mla_flags->querier_ipv6.shadowing ? '6' : '.';
2112 seq_printf(seq, "Multicast flags (own flags: [%c%c%c%s%s])\n",
2113 (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
2114 (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
2115 (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
2116 !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
2117 !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
2118 seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.');
2119 seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n",
2120 querier4, querier6);
2121 seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n",
2122 shadowing4, shadowing6);
2123 seq_puts(seq, "-------------------------------------------\n");
2124 seq_printf(seq, " %-10s %s\n", "Originator", "Flags");
2128 * batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes
2129 * @seq: seq file to print on
2132 * This prints a table of (primary) originators and their according
2133 * multicast flags, including (in the header) our own.
2137 int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
2139 struct net_device *net_dev = (struct net_device *)seq->private;
2140 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2141 struct batadv_hard_iface *primary_if;
2142 struct batadv_hashtable *hash = bat_priv->orig_hash;
2143 struct batadv_orig_node *orig_node;
2144 struct hlist_head *head;
2148 primary_if = batadv_seq_print_text_primary_if_get(seq);
2152 batadv_mcast_flags_print_header(bat_priv, seq);
2154 for (i = 0; i < hash->size; i++) {
2155 head = &hash->table[i];
2158 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
2159 if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2160 &orig_node->capa_initialized))
2163 if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2164 &orig_node->capabilities)) {
2165 seq_printf(seq, "%pM -\n", orig_node->orig);
2169 flags = orig_node->mcast_flags;
2171 seq_printf(seq, "%pM [%c%c%c%s%s]\n", orig_node->orig,
2172 (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)
2174 (flags & BATADV_MCAST_WANT_ALL_IPV4)
2176 (flags & BATADV_MCAST_WANT_ALL_IPV6)
2178 !(flags & BATADV_MCAST_WANT_NO_RTR4)
2180 !(flags & BATADV_MCAST_WANT_NO_RTR6)
2186 batadv_hardif_put(primary_if);
2193 * batadv_mcast_mesh_info_put() - put multicast info into a netlink message
2194 * @msg: buffer for the message
2195 * @bat_priv: the bat priv with all the soft interface information
2197 * Return: 0 or error code.
2199 int batadv_mcast_mesh_info_put(struct sk_buff *msg,
2200 struct batadv_priv *bat_priv)
2202 u32 flags = bat_priv->mcast.mla_flags.tvlv_flags;
2203 u32 flags_priv = BATADV_NO_FLAGS;
2205 if (bat_priv->mcast.mla_flags.bridged) {
2206 flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
2208 if (bat_priv->mcast.mla_flags.querier_ipv4.exists)
2209 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
2210 if (bat_priv->mcast.mla_flags.querier_ipv6.exists)
2211 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
2212 if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing)
2213 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
2214 if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing)
2215 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
2218 if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
2219 nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
2226 * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
2227 * to a netlink socket
2228 * @msg: buffer for the message
2229 * @portid: netlink port
2230 * @cb: Control block containing additional options
2231 * @orig_node: originator to dump the multicast flags of
2233 * Return: 0 or error code.
2236 batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid,
2237 struct netlink_callback *cb,
2238 struct batadv_orig_node *orig_node)
2242 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2243 &batadv_netlink_family, NLM_F_MULTI,
2244 BATADV_CMD_GET_MCAST_FLAGS);
2248 genl_dump_check_consistent(cb, hdr);
2250 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2252 genlmsg_cancel(msg, hdr);
2256 if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2257 &orig_node->capabilities)) {
2258 if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
2259 orig_node->mcast_flags)) {
2260 genlmsg_cancel(msg, hdr);
2265 genlmsg_end(msg, hdr);
2270 * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
2271 * table to a netlink socket
2272 * @msg: buffer for the message
2273 * @portid: netlink port
2274 * @cb: Control block containing additional options
2275 * @hash: hash to dump
2276 * @bucket: bucket index to dump
2277 * @idx_skip: How many entries to skip
2279 * Return: 0 or error code.
2282 batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid,
2283 struct netlink_callback *cb,
2284 struct batadv_hashtable *hash,
2285 unsigned int bucket, long *idx_skip)
2287 struct batadv_orig_node *orig_node;
2290 spin_lock_bh(&hash->list_locks[bucket]);
2291 cb->seq = atomic_read(&hash->generation) << 1 | 1;
2293 hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) {
2294 if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
2295 &orig_node->capa_initialized))
2298 if (idx < *idx_skip)
2301 if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) {
2302 spin_unlock_bh(&hash->list_locks[bucket]);
2311 spin_unlock_bh(&hash->list_locks[bucket]);
2317 * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
2318 * @msg: buffer for the message
2319 * @portid: netlink port
2320 * @cb: Control block containing additional options
2321 * @bat_priv: the bat priv with all the soft interface information
2322 * @bucket: current bucket to dump
2323 * @idx: index in current bucket to the next entry to dump
2325 * Return: 0 or error code.
2328 __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid,
2329 struct netlink_callback *cb,
2330 struct batadv_priv *bat_priv, long *bucket, long *idx)
2332 struct batadv_hashtable *hash = bat_priv->orig_hash;
2333 long bucket_tmp = *bucket;
2334 long idx_tmp = *idx;
2336 while (bucket_tmp < hash->size) {
2337 if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash,
2338 bucket_tmp, &idx_tmp))
2345 *bucket = bucket_tmp;
2352 * batadv_mcast_netlink_get_primary() - get primary interface from netlink
2354 * @cb: netlink callback structure
2355 * @primary_if: the primary interface pointer to return the result in
2357 * Return: 0 or error code.
2360 batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
2361 struct batadv_hard_iface **primary_if)
2363 struct batadv_hard_iface *hard_iface = NULL;
2364 struct net *net = sock_net(cb->skb->sk);
2365 struct net_device *soft_iface;
2366 struct batadv_priv *bat_priv;
2370 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2374 soft_iface = dev_get_by_index(net, ifindex);
2375 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2380 bat_priv = netdev_priv(soft_iface);
2382 hard_iface = batadv_primary_if_get_selected(bat_priv);
2383 if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
2390 dev_put(soft_iface);
2392 if (!ret && primary_if)
2393 *primary_if = hard_iface;
2394 else if (hard_iface)
2395 batadv_hardif_put(hard_iface);
2401 * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
2402 * @msg: buffer for the message
2403 * @cb: callback structure containing arguments
2405 * Return: message length.
2407 int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
2409 struct batadv_hard_iface *primary_if = NULL;
2410 int portid = NETLINK_CB(cb->skb).portid;
2411 struct batadv_priv *bat_priv;
2412 long *bucket = &cb->args[0];
2413 long *idx = &cb->args[1];
2416 ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
2420 bat_priv = netdev_priv(primary_if->soft_iface);
2421 ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx);
2423 batadv_hardif_put(primary_if);
2428 * batadv_mcast_free() - free the multicast optimizations structures
2429 * @bat_priv: the bat priv with all the soft interface information
2431 void batadv_mcast_free(struct batadv_priv *bat_priv)
2433 cancel_delayed_work_sync(&bat_priv->mcast.work);
2435 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
2436 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
2438 /* safely calling outside of worker, as worker was canceled above */
2439 batadv_mcast_mla_tt_retract(bat_priv, NULL);
2443 * batadv_mcast_purge_orig() - reset originator global mcast state modifications
2444 * @orig: the originator which is going to get purged
2446 void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
2448 struct batadv_priv *bat_priv = orig->bat_priv;
2450 spin_lock_bh(&orig->mcast_handler_lock);
2452 batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
2453 batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
2454 batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
2455 batadv_mcast_want_rtr4_update(bat_priv, orig,
2456 BATADV_MCAST_WANT_NO_RTR4);
2457 batadv_mcast_want_rtr6_update(bat_priv, orig,
2458 BATADV_MCAST_WANT_NO_RTR6);
2460 spin_unlock_bh(&orig->mcast_handler_lock);