1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Linus Lüssing
5 */
6
7#include "multicast.h"
8#include "main.h"
9
10#include <linux/atomic.h>
11#include <linux/bitops.h>
12#include <linux/bug.h>
13#include <linux/byteorder/generic.h>
14#include <linux/container_of.h>
15#include <linux/errno.h>
16#include <linux/etherdevice.h>
17#include <linux/gfp.h>
18#include <linux/icmpv6.h>
19#include <linux/if_bridge.h>
20#include <linux/if_ether.h>
21#include <linux/igmp.h>
22#include <linux/in.h>
23#include <linux/in6.h>
24#include <linux/inetdevice.h>
25#include <linux/ip.h>
26#include <linux/ipv6.h>
27#include <linux/jiffies.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/lockdep.h>
31#include <linux/netdevice.h>
32#include <linux/netlink.h>
33#include <linux/printk.h>
34#include <linux/rculist.h>
35#include <linux/rcupdate.h>
36#include <linux/skbuff.h>
37#include <linux/slab.h>
38#include <linux/spinlock.h>
39#include <linux/stddef.h>
40#include <linux/string.h>
41#include <linux/types.h>
42#include <linux/workqueue.h>
43#include <net/addrconf.h>
44#include <net/genetlink.h>
45#include <net/if_inet6.h>
46#include <net/ip.h>
47#include <net/ipv6.h>
48#include <net/netlink.h>
49#include <net/sock.h>
50#include <uapi/linux/batadv_packet.h>
51#include <uapi/linux/batman_adv.h>
52
53#include "bridge_loop_avoidance.h"
54#include "hard-interface.h"
55#include "hash.h"
56#include "log.h"
57#include "netlink.h"
58#include "send.h"
59#include "soft-interface.h"
60#include "translation-table.h"
61#include "tvlv.h"
62
63static void batadv_mcast_mla_update(struct work_struct *work);
64
65/**
66 * batadv_mcast_start_timer() - schedule the multicast periodic worker
67 * @bat_priv: the bat priv with all the soft interface information
68 */
69static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
70{
71 queue_delayed_work(wq: batadv_event_workqueue, dwork: &bat_priv->mcast.work,
72 delay: msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
73}
74
75/**
76 * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists
77 * @soft_iface: netdev struct of the mesh interface
78 *
79 * If the given soft interface has a bridge on top then the refcount
80 * of the according net device is increased.
81 *
82 * Return: NULL if no such bridge exists. Otherwise the net device of the
83 * bridge.
84 */
85static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
86{
87 struct net_device *upper = soft_iface;
88
89 rcu_read_lock();
90 do {
91 upper = netdev_master_upper_dev_get_rcu(dev: upper);
92 } while (upper && !netif_is_bridge_master(dev: upper));
93
94 dev_hold(dev: upper);
95 rcu_read_unlock();
96
97 return upper;
98}
99
100/**
101 * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from
102 * node for IPv4
103 * @dev: the interface to check
104 *
105 * Checks the presence of an IPv4 multicast router on this node.
106 *
107 * Caller needs to hold rcu read lock.
108 *
109 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise.
110 */
111static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev)
112{
113 struct in_device *in_dev = __in_dev_get_rcu(dev);
114
115 if (in_dev && IN_DEV_MFORWARD(in_dev))
116 return BATADV_NO_FLAGS;
117 else
118 return BATADV_MCAST_WANT_NO_RTR4;
119}
120
121/**
122 * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from
123 * node for IPv6
124 * @dev: the interface to check
125 *
126 * Checks the presence of an IPv6 multicast router on this node.
127 *
128 * Caller needs to hold rcu read lock.
129 *
130 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise.
131 */
132#if IS_ENABLED(CONFIG_IPV6_MROUTE)
133static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
134{
135 struct inet6_dev *in6_dev = __in6_dev_get(dev);
136
137 if (in6_dev && atomic_read(v: &in6_dev->cnf.mc_forwarding))
138 return BATADV_NO_FLAGS;
139 else
140 return BATADV_MCAST_WANT_NO_RTR6;
141}
142#else
143static inline u8
144batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
145{
146 return BATADV_MCAST_WANT_NO_RTR6;
147}
148#endif
149
150/**
151 * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node
152 * @bat_priv: the bat priv with all the soft interface information
153 * @bridge: bridge interface on top of the soft_iface if present,
154 * otherwise pass NULL
155 *
156 * Checks the presence of IPv4 and IPv6 multicast routers on this
157 * node.
158 *
159 * Return:
160 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
161 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
162 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
163 * The former two OR'd: no multicast router is present
164 */
165static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv,
166 struct net_device *bridge)
167{
168 struct net_device *dev = bridge ? bridge : bat_priv->soft_iface;
169 u8 flags = BATADV_NO_FLAGS;
170
171 rcu_read_lock();
172
173 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev);
174 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev);
175
176 rcu_read_unlock();
177
178 return flags;
179}
180
181/**
182 * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge
183 * @bat_priv: the bat priv with all the soft interface information
184 * @bridge: bridge interface on top of the soft_iface if present,
185 * otherwise pass NULL
186 *
187 * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge.
188 *
189 * Return:
190 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
191 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
192 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
193 * The former two OR'd: no multicast router is present
194 */
195static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
196 struct net_device *bridge)
197{
198 struct net_device *dev = bat_priv->soft_iface;
199 u8 flags = BATADV_NO_FLAGS;
200
201 if (!bridge)
202 return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
203
204 if (!br_multicast_has_router_adjacent(dev, ETH_P_IP))
205 flags |= BATADV_MCAST_WANT_NO_RTR4;
206 if (!br_multicast_has_router_adjacent(dev, ETH_P_IPV6))
207 flags |= BATADV_MCAST_WANT_NO_RTR6;
208
209 return flags;
210}
211
212/**
213 * batadv_mcast_mla_rtr_flags_get() - get multicast router flags
214 * @bat_priv: the bat priv with all the soft interface information
215 * @bridge: bridge interface on top of the soft_iface if present,
216 * otherwise pass NULL
217 *
218 * Checks the presence of IPv4 and IPv6 multicast routers on this
219 * node or behind its bridge.
220 *
221 * Return:
222 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
223 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
224 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
225 * The former two OR'd: no multicast router is present
226 */
227static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv,
228 struct net_device *bridge)
229{
230 u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
231
232 flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge);
233 flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge);
234
235 return flags;
236}
237
238/**
239 * batadv_mcast_mla_flags_get() - get the new multicast flags
240 * @bat_priv: the bat priv with all the soft interface information
241 *
242 * Return: A set of flags for the current/next TVLV, querier and
243 * bridge state.
244 */
245static struct batadv_mcast_mla_flags
246batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv)
247{
248 struct net_device *dev = bat_priv->soft_iface;
249 struct batadv_mcast_querier_state *qr4, *qr6;
250 struct batadv_mcast_mla_flags mla_flags;
251 struct net_device *bridge;
252
253 bridge = batadv_mcast_get_bridge(soft_iface: dev);
254
255 memset(&mla_flags, 0, sizeof(mla_flags));
256 mla_flags.enabled = 1;
257 mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv,
258 bridge);
259
260 if (!bridge)
261 return mla_flags;
262
263 dev_put(dev: bridge);
264
265 mla_flags.bridged = 1;
266 qr4 = &mla_flags.querier_ipv4;
267 qr6 = &mla_flags.querier_ipv6;
268
269 if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
270 pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
271
272 qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
273 qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
274
275 qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
276 qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
277
278 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
279
280 /* 1) If no querier exists at all, then multicast listeners on
281 * our local TT clients behind the bridge will keep silent.
282 * 2) If the selected querier is on one of our local TT clients,
283 * behind the bridge, then this querier might shadow multicast
284 * listeners on our local TT clients, behind this bridge.
285 *
286 * In both cases, we will signalize other batman nodes that
287 * we need all multicast traffic of the according protocol.
288 */
289 if (!qr4->exists || qr4->shadowing) {
290 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4;
291 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4;
292 }
293
294 if (!qr6->exists || qr6->shadowing) {
295 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6;
296 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6;
297 }
298
299 return mla_flags;
300}
301
302/**
303 * batadv_mcast_mla_is_duplicate() - check whether an address is in a list
304 * @mcast_addr: the multicast address to check
305 * @mcast_list: the list with multicast addresses to search in
306 *
307 * Return: true if the given address is already in the given list.
308 * Otherwise returns false.
309 */
310static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
311 struct hlist_head *mcast_list)
312{
313 struct batadv_hw_addr *mcast_entry;
314
315 hlist_for_each_entry(mcast_entry, mcast_list, list)
316 if (batadv_compare_eth(data1: mcast_entry->addr, data2: mcast_addr))
317 return true;
318
319 return false;
320}
321
322/**
323 * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners
324 * @dev: the device to collect multicast addresses from
325 * @mcast_list: a list to put found addresses into
326 * @flags: flags indicating the new multicast state
327 *
328 * Collects multicast addresses of IPv4 multicast listeners residing
329 * on this kernel on the given soft interface, dev, in
330 * the given mcast_list. In general, multicast listeners provided by
331 * your multicast receiving applications run directly on this node.
332 *
333 * Return: -ENOMEM on memory allocation error or the number of
334 * items added to the mcast_list otherwise.
335 */
336static int
337batadv_mcast_mla_softif_get_ipv4(struct net_device *dev,
338 struct hlist_head *mcast_list,
339 struct batadv_mcast_mla_flags *flags)
340{
341 struct batadv_hw_addr *new;
342 struct in_device *in_dev;
343 u8 mcast_addr[ETH_ALEN];
344 struct ip_mc_list *pmc;
345 int ret = 0;
346
347 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
348 return 0;
349
350 rcu_read_lock();
351
352 in_dev = __in_dev_get_rcu(dev);
353 if (!in_dev) {
354 rcu_read_unlock();
355 return 0;
356 }
357
358 for (pmc = rcu_dereference(in_dev->mc_list); pmc;
359 pmc = rcu_dereference(pmc->next_rcu)) {
360 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
361 ipv4_is_local_multicast(addr: pmc->multiaddr))
362 continue;
363
364 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
365 !ipv4_is_local_multicast(addr: pmc->multiaddr))
366 continue;
367
368 ip_eth_mc_map(naddr: pmc->multiaddr, buf: mcast_addr);
369
370 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
371 continue;
372
373 new = kmalloc(size: sizeof(*new), GFP_ATOMIC);
374 if (!new) {
375 ret = -ENOMEM;
376 break;
377 }
378
379 ether_addr_copy(dst: new->addr, src: mcast_addr);
380 hlist_add_head(n: &new->list, h: mcast_list);
381 ret++;
382 }
383 rcu_read_unlock();
384
385 return ret;
386}
387
388/**
389 * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners
390 * @dev: the device to collect multicast addresses from
391 * @mcast_list: a list to put found addresses into
392 * @flags: flags indicating the new multicast state
393 *
394 * Collects multicast addresses of IPv6 multicast listeners residing
395 * on this kernel on the given soft interface, dev, in
396 * the given mcast_list. In general, multicast listeners provided by
397 * your multicast receiving applications run directly on this node.
398 *
399 * Return: -ENOMEM on memory allocation error or the number of
400 * items added to the mcast_list otherwise.
401 */
402#if IS_ENABLED(CONFIG_IPV6)
403static int
404batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
405 struct hlist_head *mcast_list,
406 struct batadv_mcast_mla_flags *flags)
407{
408 struct batadv_hw_addr *new;
409 struct inet6_dev *in6_dev;
410 u8 mcast_addr[ETH_ALEN];
411 struct ifmcaddr6 *pmc6;
412 int ret = 0;
413
414 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
415 return 0;
416
417 rcu_read_lock();
418
419 in6_dev = __in6_dev_get(dev);
420 if (!in6_dev) {
421 rcu_read_unlock();
422 return 0;
423 }
424
425 for (pmc6 = rcu_dereference(in6_dev->mc_list);
426 pmc6;
427 pmc6 = rcu_dereference(pmc6->next)) {
428 if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
429 IPV6_ADDR_SCOPE_LINKLOCAL)
430 continue;
431
432 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
433 ipv6_addr_is_ll_all_nodes(addr: &pmc6->mca_addr))
434 continue;
435
436 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
437 IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) >
438 IPV6_ADDR_SCOPE_LINKLOCAL)
439 continue;
440
441 ipv6_eth_mc_map(addr: &pmc6->mca_addr, buf: mcast_addr);
442
443 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
444 continue;
445
446 new = kmalloc(size: sizeof(*new), GFP_ATOMIC);
447 if (!new) {
448 ret = -ENOMEM;
449 break;
450 }
451
452 ether_addr_copy(dst: new->addr, src: mcast_addr);
453 hlist_add_head(n: &new->list, h: mcast_list);
454 ret++;
455 }
456 rcu_read_unlock();
457
458 return ret;
459}
460#else
461static inline int
462batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
463 struct hlist_head *mcast_list,
464 struct batadv_mcast_mla_flags *flags)
465{
466 return 0;
467}
468#endif
469
470/**
471 * batadv_mcast_mla_softif_get() - get softif multicast listeners
472 * @dev: the device to collect multicast addresses from
473 * @mcast_list: a list to put found addresses into
474 * @flags: flags indicating the new multicast state
475 *
476 * Collects multicast addresses of multicast listeners residing
477 * on this kernel on the given soft interface, dev, in
478 * the given mcast_list. In general, multicast listeners provided by
479 * your multicast receiving applications run directly on this node.
480 *
481 * If there is a bridge interface on top of dev, collect from that one
482 * instead. Just like with IP addresses and routes, multicast listeners
483 * will(/should) register to the bridge interface instead of an
484 * enslaved bat0.
485 *
486 * Return: -ENOMEM on memory allocation error or the number of
487 * items added to the mcast_list otherwise.
488 */
489static int
490batadv_mcast_mla_softif_get(struct net_device *dev,
491 struct hlist_head *mcast_list,
492 struct batadv_mcast_mla_flags *flags)
493{
494 struct net_device *bridge = batadv_mcast_get_bridge(soft_iface: dev);
495 int ret4, ret6 = 0;
496
497 if (bridge)
498 dev = bridge;
499
500 ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags);
501 if (ret4 < 0)
502 goto out;
503
504 ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags);
505 if (ret6 < 0) {
506 ret4 = 0;
507 goto out;
508 }
509
510out:
511 dev_put(dev: bridge);
512
513 return ret4 + ret6;
514}
515
516/**
517 * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address
518 * @dst: destination to write to - a multicast MAC address
519 * @src: source to read from - a multicast IP address
520 *
521 * Converts a given multicast IPv4/IPv6 address from a bridge
522 * to its matching multicast MAC address and copies it into the given
523 * destination buffer.
524 *
525 * Caller needs to make sure the destination buffer can hold
526 * at least ETH_ALEN bytes.
527 */
528static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
529{
530 if (src->proto == htons(ETH_P_IP))
531 ip_eth_mc_map(naddr: src->dst.ip4, buf: dst);
532#if IS_ENABLED(CONFIG_IPV6)
533 else if (src->proto == htons(ETH_P_IPV6))
534 ipv6_eth_mc_map(addr: &src->dst.ip6, buf: dst);
535#endif
536 else
537 eth_zero_addr(addr: dst);
538}
539
540/**
541 * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
542 * @dev: a bridge slave whose bridge to collect multicast addresses from
543 * @mcast_list: a list to put found addresses into
544 * @flags: flags indicating the new multicast state
545 *
546 * Collects multicast addresses of multicast listeners residing
547 * on foreign, non-mesh devices which we gave access to our mesh via
548 * a bridge on top of the given soft interface, dev, in the given
549 * mcast_list.
550 *
551 * Return: -ENOMEM on memory allocation error or the number of
552 * items added to the mcast_list otherwise.
553 */
554static int batadv_mcast_mla_bridge_get(struct net_device *dev,
555 struct hlist_head *mcast_list,
556 struct batadv_mcast_mla_flags *flags)
557{
558 struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
559 struct br_ip_list *br_ip_entry, *tmp;
560 u8 tvlv_flags = flags->tvlv_flags;
561 struct batadv_hw_addr *new;
562 u8 mcast_addr[ETH_ALEN];
563 int ret;
564
565 /* we don't need to detect these devices/listeners, the IGMP/MLD
566 * snooping code of the Linux bridge already does that for us
567 */
568 ret = br_multicast_list_adjacent(dev, br_ip_list: &bridge_mcast_list);
569 if (ret < 0)
570 goto out;
571
572 list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
573 if (br_ip_entry->addr.proto == htons(ETH_P_IP)) {
574 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
575 continue;
576
577 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
578 ipv4_is_local_multicast(addr: br_ip_entry->addr.dst.ip4))
579 continue;
580
581 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
582 !ipv4_is_local_multicast(addr: br_ip_entry->addr.dst.ip4))
583 continue;
584 }
585
586#if IS_ENABLED(CONFIG_IPV6)
587 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) {
588 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
589 continue;
590
591 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
592 ipv6_addr_is_ll_all_nodes(addr: &br_ip_entry->addr.dst.ip6))
593 continue;
594
595 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
596 IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) >
597 IPV6_ADDR_SCOPE_LINKLOCAL)
598 continue;
599 }
600#endif
601
602 batadv_mcast_mla_br_addr_cpy(dst: mcast_addr, src: &br_ip_entry->addr);
603 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
604 continue;
605
606 new = kmalloc(size: sizeof(*new), GFP_ATOMIC);
607 if (!new) {
608 ret = -ENOMEM;
609 break;
610 }
611
612 ether_addr_copy(dst: new->addr, src: mcast_addr);
613 hlist_add_head(n: &new->list, h: mcast_list);
614 }
615
616out:
617 list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
618 list_del(entry: &br_ip_entry->list);
619 kfree(objp: br_ip_entry);
620 }
621
622 return ret;
623}
624
625/**
626 * batadv_mcast_mla_list_free() - free a list of multicast addresses
627 * @mcast_list: the list to free
628 *
629 * Removes and frees all items in the given mcast_list.
630 */
631static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
632{
633 struct batadv_hw_addr *mcast_entry;
634 struct hlist_node *tmp;
635
636 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
637 hlist_del(n: &mcast_entry->list);
638 kfree(objp: mcast_entry);
639 }
640}
641
642/**
643 * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements
644 * @bat_priv: the bat priv with all the soft interface information
645 * @mcast_list: a list of addresses which should _not_ be removed
646 *
647 * Retracts the announcement of any multicast listener from the
648 * translation table except the ones listed in the given mcast_list.
649 *
650 * If mcast_list is NULL then all are retracted.
651 */
652static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
653 struct hlist_head *mcast_list)
654{
655 struct batadv_hw_addr *mcast_entry;
656 struct hlist_node *tmp;
657
658 hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
659 list) {
660 if (mcast_list &&
661 batadv_mcast_mla_is_duplicate(mcast_addr: mcast_entry->addr,
662 mcast_list))
663 continue;
664
665 batadv_tt_local_remove(bat_priv, addr: mcast_entry->addr,
666 BATADV_NO_FLAGS,
667 message: "mcast TT outdated", roaming: false);
668
669 hlist_del(n: &mcast_entry->list);
670 kfree(objp: mcast_entry);
671 }
672}
673
674/**
675 * batadv_mcast_mla_tt_add() - add multicast listener announcements
676 * @bat_priv: the bat priv with all the soft interface information
677 * @mcast_list: a list of addresses which are going to get added
678 *
679 * Adds multicast listener announcements from the given mcast_list to the
680 * translation table if they have not been added yet.
681 */
682static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
683 struct hlist_head *mcast_list)
684{
685 struct batadv_hw_addr *mcast_entry;
686 struct hlist_node *tmp;
687
688 if (!mcast_list)
689 return;
690
691 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
692 if (batadv_mcast_mla_is_duplicate(mcast_addr: mcast_entry->addr,
693 mcast_list: &bat_priv->mcast.mla_list))
694 continue;
695
696 if (!batadv_tt_local_add(soft_iface: bat_priv->soft_iface,
697 addr: mcast_entry->addr, BATADV_NO_FLAGS,
698 BATADV_NULL_IFINDEX, BATADV_NO_MARK))
699 continue;
700
701 hlist_del(n: &mcast_entry->list);
702 hlist_add_head(n: &mcast_entry->list, h: &bat_priv->mcast.mla_list);
703 }
704}
705
706/**
707 * batadv_mcast_querier_log() - debug output regarding the querier status on
708 * link
709 * @bat_priv: the bat priv with all the soft interface information
710 * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
711 * @old_state: the previous querier state on our link
712 * @new_state: the new querier state on our link
713 *
714 * Outputs debug messages to the logging facility with log level 'mcast'
715 * regarding changes to the querier status on the link which are relevant
716 * to our multicast optimizations.
717 *
718 * Usually this is about whether a querier appeared or vanished in
719 * our mesh or whether the querier is in the suboptimal position of being
720 * behind our local bridge segment: Snooping switches will directly
721 * forward listener reports to the querier, therefore batman-adv and
722 * the bridge will potentially not see these listeners - the querier is
723 * potentially shadowing listeners from us then.
724 *
725 * This is only interesting for nodes with a bridge on top of their
726 * soft interface.
727 */
728static void
729batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
730 struct batadv_mcast_querier_state *old_state,
731 struct batadv_mcast_querier_state *new_state)
732{
733 if (!old_state->exists && new_state->exists)
734 batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
735 str_proto);
736 else if (old_state->exists && !new_state->exists)
737 batadv_info(bat_priv->soft_iface,
738 "%s Querier disappeared - multicast optimizations disabled\n",
739 str_proto);
740 else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists)
741 batadv_info(bat_priv->soft_iface,
742 "No %s Querier present - multicast optimizations disabled\n",
743 str_proto);
744
745 if (new_state->exists) {
746 if ((!old_state->shadowing && new_state->shadowing) ||
747 (!old_state->exists && new_state->shadowing))
748 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
749 "%s Querier is behind our bridged segment: Might shadow listeners\n",
750 str_proto);
751 else if (old_state->shadowing && !new_state->shadowing)
752 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
753 "%s Querier is not behind our bridged segment\n",
754 str_proto);
755 }
756}
757
758/**
759 * batadv_mcast_bridge_log() - debug output for topology changes in bridged
760 * setups
761 * @bat_priv: the bat priv with all the soft interface information
762 * @new_flags: flags indicating the new multicast state
763 *
764 * If no bridges are ever used on this node, then this function does nothing.
765 *
766 * Otherwise this function outputs debug information to the 'mcast' log level
767 * which might be relevant to our multicast optimizations.
768 *
769 * More precisely, it outputs information when a bridge interface is added or
770 * removed from a soft interface. And when a bridge is present, it further
771 * outputs information about the querier state which is relevant for the
772 * multicast flags this node is going to set.
773 */
774static void
775batadv_mcast_bridge_log(struct batadv_priv *bat_priv,
776 struct batadv_mcast_mla_flags *new_flags)
777{
778 struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags;
779
780 if (!old_flags->bridged && new_flags->bridged)
781 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
782 "Bridge added: Setting Unsnoopables(U)-flag\n");
783 else if (old_flags->bridged && !new_flags->bridged)
784 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
785 "Bridge removed: Unsetting Unsnoopables(U)-flag\n");
786
787 if (new_flags->bridged) {
788 batadv_mcast_querier_log(bat_priv, str_proto: "IGMP",
789 old_state: &old_flags->querier_ipv4,
790 new_state: &new_flags->querier_ipv4);
791 batadv_mcast_querier_log(bat_priv, str_proto: "MLD",
792 old_state: &old_flags->querier_ipv6,
793 new_state: &new_flags->querier_ipv6);
794 }
795}
796
797/**
798 * batadv_mcast_flags_log() - output debug information about mcast flag changes
799 * @bat_priv: the bat priv with all the soft interface information
800 * @flags: TVLV flags indicating the new multicast state
801 *
802 * Whenever the multicast TVLV flags this node announces change, this function
803 * should be used to notify userspace about the change.
804 */
805static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
806{
807 bool old_enabled = bat_priv->mcast.mla_flags.enabled;
808 u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags;
809 char str_old_flags[] = "[.... . ]";
810
811 sprintf(buf: str_old_flags, fmt: "[%c%c%c%s%s]",
812 (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
813 (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
814 (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
815 !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
816 !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
817
818 batadv_dbg(BATADV_DBG_MCAST, bat_priv,
819 "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n",
820 old_enabled ? str_old_flags : "<undefined>",
821 (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
822 (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
823 (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
824 !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
825 !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
826}
827
828/**
829 * batadv_mcast_mla_flags_update() - update multicast flags
830 * @bat_priv: the bat priv with all the soft interface information
831 * @flags: flags indicating the new multicast state
832 *
833 * Updates the own multicast tvlv with our current multicast related settings,
834 * capabilities and inabilities.
835 */
836static void
837batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv,
838 struct batadv_mcast_mla_flags *flags)
839{
840 struct batadv_tvlv_mcast_data mcast_data;
841
842 if (!memcmp(p: flags, q: &bat_priv->mcast.mla_flags, size: sizeof(*flags)))
843 return;
844
845 batadv_mcast_bridge_log(bat_priv, new_flags: flags);
846 batadv_mcast_flags_log(bat_priv, flags: flags->tvlv_flags);
847
848 mcast_data.flags = flags->tvlv_flags;
849 memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
850
851 batadv_tvlv_container_register(bat_priv, type: BATADV_TVLV_MCAST, version: 2,
852 tvlv_value: &mcast_data, tvlv_value_len: sizeof(mcast_data));
853
854 bat_priv->mcast.mla_flags = *flags;
855}
856
857/**
858 * __batadv_mcast_mla_update() - update the own MLAs
859 * @bat_priv: the bat priv with all the soft interface information
860 *
861 * Updates the own multicast listener announcements in the translation
862 * table as well as the own, announced multicast tvlv container.
863 *
864 * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
865 * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
866 * ensured by the non-parallel execution of the worker this function
867 * belongs to.
868 */
869static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
870{
871 struct net_device *soft_iface = bat_priv->soft_iface;
872 struct hlist_head mcast_list = HLIST_HEAD_INIT;
873 struct batadv_mcast_mla_flags flags;
874 int ret;
875
876 flags = batadv_mcast_mla_flags_get(bat_priv);
877
878 ret = batadv_mcast_mla_softif_get(dev: soft_iface, mcast_list: &mcast_list, flags: &flags);
879 if (ret < 0)
880 goto out;
881
882 ret = batadv_mcast_mla_bridge_get(dev: soft_iface, mcast_list: &mcast_list, flags: &flags);
883 if (ret < 0)
884 goto out;
885
886 spin_lock(lock: &bat_priv->mcast.mla_lock);
887 batadv_mcast_mla_tt_retract(bat_priv, mcast_list: &mcast_list);
888 batadv_mcast_mla_tt_add(bat_priv, mcast_list: &mcast_list);
889 batadv_mcast_mla_flags_update(bat_priv, flags: &flags);
890 spin_unlock(lock: &bat_priv->mcast.mla_lock);
891
892out:
893 batadv_mcast_mla_list_free(mcast_list: &mcast_list);
894}
895
896/**
897 * batadv_mcast_mla_update() - update the own MLAs
898 * @work: kernel work struct
899 *
900 * Updates the own multicast listener announcements in the translation
901 * table as well as the own, announced multicast tvlv container.
902 *
903 * In the end, reschedules the work timer.
904 */
905static void batadv_mcast_mla_update(struct work_struct *work)
906{
907 struct delayed_work *delayed_work;
908 struct batadv_priv_mcast *priv_mcast;
909 struct batadv_priv *bat_priv;
910
911 delayed_work = to_delayed_work(work);
912 priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
913 bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
914
915 __batadv_mcast_mla_update(bat_priv);
916 batadv_mcast_start_timer(bat_priv);
917}
918
919/**
920 * batadv_mcast_is_report_ipv4() - check for IGMP reports
921 * @skb: the ethernet frame destined for the mesh
922 *
923 * This call might reallocate skb data.
924 *
925 * Checks whether the given frame is a valid IGMP report.
926 *
927 * Return: If so then true, otherwise false.
928 */
929static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
930{
931 if (ip_mc_check_igmp(skb) < 0)
932 return false;
933
934 switch (igmp_hdr(skb)->type) {
935 case IGMP_HOST_MEMBERSHIP_REPORT:
936 case IGMPV2_HOST_MEMBERSHIP_REPORT:
937 case IGMPV3_HOST_MEMBERSHIP_REPORT:
938 return true;
939 }
940
941 return false;
942}
943
944/**
945 * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding
946 * potential
947 * @bat_priv: the bat priv with all the soft interface information
948 * @skb: the IPv4 packet to check
949 * @is_unsnoopable: stores whether the destination is snoopable
950 * @is_routable: stores whether the destination is routable
951 *
952 * Checks whether the given IPv4 packet has the potential to be forwarded with a
953 * mode more optimal than classic flooding.
954 *
955 * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
956 * allocation failure.
957 */
958static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
959 struct sk_buff *skb,
960 bool *is_unsnoopable,
961 int *is_routable)
962{
963 struct iphdr *iphdr;
964
965 /* We might fail due to out-of-memory -> drop it */
966 if (!pskb_may_pull(skb, len: sizeof(struct ethhdr) + sizeof(*iphdr)))
967 return -ENOMEM;
968
969 if (batadv_mcast_is_report_ipv4(skb))
970 return -EINVAL;
971
972 iphdr = ip_hdr(skb);
973
974 /* link-local multicast listeners behind a bridge are
975 * not snoopable (see RFC4541, section 2.1.2.2)
976 */
977 if (ipv4_is_local_multicast(addr: iphdr->daddr))
978 *is_unsnoopable = true;
979 else
980 *is_routable = ETH_P_IP;
981
982 return 0;
983}
984
985/**
986 * batadv_mcast_is_report_ipv6() - check for MLD reports
987 * @skb: the ethernet frame destined for the mesh
988 *
989 * This call might reallocate skb data.
990 *
991 * Checks whether the given frame is a valid MLD report.
992 *
993 * Return: If so then true, otherwise false.
994 */
995static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
996{
997 if (ipv6_mc_check_mld(skb) < 0)
998 return false;
999
1000 switch (icmp6_hdr(skb)->icmp6_type) {
1001 case ICMPV6_MGM_REPORT:
1002 case ICMPV6_MLD2_REPORT:
1003 return true;
1004 }
1005
1006 return false;
1007}
1008
1009/**
1010 * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding
1011 * potential
1012 * @bat_priv: the bat priv with all the soft interface information
1013 * @skb: the IPv6 packet to check
1014 * @is_unsnoopable: stores whether the destination is snoopable
1015 * @is_routable: stores whether the destination is routable
1016 *
1017 * Checks whether the given IPv6 packet has the potential to be forwarded with a
1018 * mode more optimal than classic flooding.
1019 *
1020 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1021 */
1022static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
1023 struct sk_buff *skb,
1024 bool *is_unsnoopable,
1025 int *is_routable)
1026{
1027 struct ipv6hdr *ip6hdr;
1028
1029 /* We might fail due to out-of-memory -> drop it */
1030 if (!pskb_may_pull(skb, len: sizeof(struct ethhdr) + sizeof(*ip6hdr)))
1031 return -ENOMEM;
1032
1033 if (batadv_mcast_is_report_ipv6(skb))
1034 return -EINVAL;
1035
1036 ip6hdr = ipv6_hdr(skb);
1037
1038 if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1039 return -EINVAL;
1040
1041 /* link-local-all-nodes multicast listeners behind a bridge are
1042 * not snoopable (see RFC4541, section 3, paragraph 3)
1043 */
1044 if (ipv6_addr_is_ll_all_nodes(addr: &ip6hdr->daddr))
1045 *is_unsnoopable = true;
1046 else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL)
1047 *is_routable = ETH_P_IPV6;
1048
1049 return 0;
1050}
1051
1052/**
1053 * batadv_mcast_forw_mode_check() - check for optimized forwarding potential
1054 * @bat_priv: the bat priv with all the soft interface information
1055 * @skb: the multicast frame to check
1056 * @is_unsnoopable: stores whether the destination is snoopable
1057 * @is_routable: stores whether the destination is routable
1058 *
1059 * Checks whether the given multicast ethernet frame has the potential to be
1060 * forwarded with a mode more optimal than classic flooding.
1061 *
1062 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
1063 */
1064static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
1065 struct sk_buff *skb,
1066 bool *is_unsnoopable,
1067 int *is_routable)
1068{
1069 struct ethhdr *ethhdr = eth_hdr(skb);
1070
1071 if (!atomic_read(v: &bat_priv->multicast_mode))
1072 return -EINVAL;
1073
1074 switch (ntohs(ethhdr->h_proto)) {
1075 case ETH_P_IP:
1076 return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
1077 is_unsnoopable,
1078 is_routable);
1079 case ETH_P_IPV6:
1080 if (!IS_ENABLED(CONFIG_IPV6))
1081 return -EINVAL;
1082
1083 return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
1084 is_unsnoopable,
1085 is_routable);
1086 default:
1087 return -EINVAL;
1088 }
1089}
1090
1091/**
1092 * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast
1093 * interest
1094 * @bat_priv: the bat priv with all the soft interface information
1095 * @ethhdr: ethernet header of a packet
1096 *
1097 * Return: the number of nodes which want all IPv4 multicast traffic if the
1098 * given ethhdr is from an IPv4 packet or the number of nodes which want all
1099 * IPv6 traffic if it matches an IPv6 packet.
1100 */
1101static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
1102 struct ethhdr *ethhdr)
1103{
1104 switch (ntohs(ethhdr->h_proto)) {
1105 case ETH_P_IP:
1106 return atomic_read(v: &bat_priv->mcast.num_want_all_ipv4);
1107 case ETH_P_IPV6:
1108 return atomic_read(v: &bat_priv->mcast.num_want_all_ipv6);
1109 default:
1110 /* we shouldn't be here... */
1111 return 0;
1112 }
1113}
1114
1115/**
1116 * batadv_mcast_forw_rtr_count() - count nodes with a multicast router
1117 * @bat_priv: the bat priv with all the soft interface information
1118 * @protocol: the ethernet protocol type to count multicast routers for
1119 *
1120 * Return: the number of nodes which want all routable IPv4 multicast traffic
1121 * if the protocol is ETH_P_IP or the number of nodes which want all routable
1122 * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0.
1123 */
1124
1125static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv,
1126 int protocol)
1127{
1128 switch (protocol) {
1129 case ETH_P_IP:
1130 return atomic_read(v: &bat_priv->mcast.num_want_all_rtr4);
1131 case ETH_P_IPV6:
1132 return atomic_read(v: &bat_priv->mcast.num_want_all_rtr6);
1133 default:
1134 return 0;
1135 }
1136}
1137
1138/**
1139 * batadv_mcast_forw_mode() - check on how to forward a multicast packet
1140 * @bat_priv: the bat priv with all the soft interface information
1141 * @skb: the multicast packet to check
1142 * @is_routable: stores whether the destination is routable
1143 *
1144 * Return: The forwarding mode as enum batadv_forw_mode.
1145 */
1146enum batadv_forw_mode
1147batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
1148 int *is_routable)
1149{
1150 int ret, tt_count, ip_count, unsnoop_count, total_count;
1151 bool is_unsnoopable = false;
1152 struct ethhdr *ethhdr;
1153 int rtr_count = 0;
1154
1155 ret = batadv_mcast_forw_mode_check(bat_priv, skb, is_unsnoopable: &is_unsnoopable,
1156 is_routable);
1157 if (ret == -ENOMEM)
1158 return BATADV_FORW_NONE;
1159 else if (ret < 0)
1160 return BATADV_FORW_BCAST;
1161
1162 ethhdr = eth_hdr(skb);
1163
1164 tt_count = batadv_tt_global_hash_count(bat_priv, addr: ethhdr->h_dest,
1165 BATADV_NO_FLAGS);
1166 ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
1167 unsnoop_count = !is_unsnoopable ? 0 :
1168 atomic_read(v: &bat_priv->mcast.num_want_all_unsnoopables);
1169 rtr_count = batadv_mcast_forw_rtr_count(bat_priv, protocol: *is_routable);
1170
1171 total_count = tt_count + ip_count + unsnoop_count + rtr_count;
1172
1173 if (!total_count)
1174 return BATADV_FORW_NONE;
1175 else if (unsnoop_count)
1176 return BATADV_FORW_BCAST;
1177
1178 if (total_count <= atomic_read(v: &bat_priv->multicast_fanout))
1179 return BATADV_FORW_UCASTS;
1180
1181 return BATADV_FORW_BCAST;
1182}
1183
1184/**
1185 * batadv_mcast_forw_send_orig() - send a multicast packet to an originator
1186 * @bat_priv: the bat priv with all the soft interface information
1187 * @skb: the multicast packet to send
1188 * @vid: the vlan identifier
1189 * @orig_node: the originator to send the packet to
1190 *
1191 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
1192 */
1193static int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
1194 struct sk_buff *skb,
1195 unsigned short vid,
1196 struct batadv_orig_node *orig_node)
1197{
1198 /* Avoid sending multicast-in-unicast packets to other BLA
1199 * gateways - they already got the frame from the LAN side
1200 * we share with them.
1201 * TODO: Refactor to take BLA into account earlier, to avoid
1202 * reducing the mcast_fanout count.
1203 */
1204 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig: orig_node->orig, vid)) {
1205 dev_kfree_skb(skb);
1206 return NET_XMIT_SUCCESS;
1207 }
1208
1209 return batadv_send_skb_unicast(bat_priv, skb, packet_type: BATADV_UNICAST, packet_subtype: 0,
1210 orig_node, vid);
1211}
1212
1213/**
1214 * batadv_mcast_forw_tt() - forwards a packet to multicast listeners
1215 * @bat_priv: the bat priv with all the soft interface information
1216 * @skb: the multicast packet to transmit
1217 * @vid: the vlan identifier
1218 *
1219 * Sends copies of a frame with multicast destination to any multicast
1220 * listener registered in the translation table. A transmission is performed
1221 * via a batman-adv unicast packet for each such destination node.
1222 *
1223 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1224 * otherwise.
1225 */
1226static int
1227batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb,
1228 unsigned short vid)
1229{
1230 int ret = NET_XMIT_SUCCESS;
1231 struct sk_buff *newskb;
1232
1233 struct batadv_tt_orig_list_entry *orig_entry;
1234
1235 struct batadv_tt_global_entry *tt_global;
1236 const u8 *addr = eth_hdr(skb)->h_dest;
1237
1238 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
1239 if (!tt_global)
1240 goto out;
1241
1242 rcu_read_lock();
1243 hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) {
1244 newskb = skb_copy(skb, GFP_ATOMIC);
1245 if (!newskb) {
1246 ret = NET_XMIT_DROP;
1247 break;
1248 }
1249
1250 batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid,
1251 orig_node: orig_entry->orig_node);
1252 }
1253 rcu_read_unlock();
1254
1255 batadv_tt_global_entry_put(tt_global_entry: tt_global);
1256
1257out:
1258 return ret;
1259}
1260
1261/**
1262 * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4
1263 * @bat_priv: the bat priv with all the soft interface information
1264 * @skb: the multicast packet to transmit
1265 * @vid: the vlan identifier
1266 *
1267 * Sends copies of a frame with multicast destination to any node with a
1268 * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a
1269 * batman-adv unicast packet for each such destination node.
1270 *
1271 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1272 * otherwise.
1273 */
1274static int
1275batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv,
1276 struct sk_buff *skb, unsigned short vid)
1277{
1278 struct batadv_orig_node *orig_node;
1279 int ret = NET_XMIT_SUCCESS;
1280 struct sk_buff *newskb;
1281
1282 rcu_read_lock();
1283 hlist_for_each_entry_rcu(orig_node,
1284 &bat_priv->mcast.want_all_ipv4_list,
1285 mcast_want_all_ipv4_node) {
1286 newskb = skb_copy(skb, GFP_ATOMIC);
1287 if (!newskb) {
1288 ret = NET_XMIT_DROP;
1289 break;
1290 }
1291
1292 batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node);
1293 }
1294 rcu_read_unlock();
1295 return ret;
1296}
1297
1298/**
1299 * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6
1300 * @bat_priv: the bat priv with all the soft interface information
1301 * @skb: The multicast packet to transmit
1302 * @vid: the vlan identifier
1303 *
1304 * Sends copies of a frame with multicast destination to any node with a
1305 * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a
1306 * batman-adv unicast packet for each such destination node.
1307 *
1308 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1309 * otherwise.
1310 */
1311static int
1312batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv,
1313 struct sk_buff *skb, unsigned short vid)
1314{
1315 struct batadv_orig_node *orig_node;
1316 int ret = NET_XMIT_SUCCESS;
1317 struct sk_buff *newskb;
1318
1319 rcu_read_lock();
1320 hlist_for_each_entry_rcu(orig_node,
1321 &bat_priv->mcast.want_all_ipv6_list,
1322 mcast_want_all_ipv6_node) {
1323 newskb = skb_copy(skb, GFP_ATOMIC);
1324 if (!newskb) {
1325 ret = NET_XMIT_DROP;
1326 break;
1327 }
1328
1329 batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node);
1330 }
1331 rcu_read_unlock();
1332 return ret;
1333}
1334
1335/**
1336 * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list
1337 * @bat_priv: the bat priv with all the soft interface information
1338 * @skb: the multicast packet to transmit
1339 * @vid: the vlan identifier
1340 *
1341 * Sends copies of a frame with multicast destination to any node with a
1342 * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A
1343 * transmission is performed via a batman-adv unicast packet for each such
1344 * destination node.
1345 *
1346 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1347 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1348 */
1349static int
1350batadv_mcast_forw_want_all(struct batadv_priv *bat_priv,
1351 struct sk_buff *skb, unsigned short vid)
1352{
1353 switch (ntohs(eth_hdr(skb)->h_proto)) {
1354 case ETH_P_IP:
1355 return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid);
1356 case ETH_P_IPV6:
1357 return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid);
1358 default:
1359 /* we shouldn't be here... */
1360 return NET_XMIT_DROP;
1361 }
1362}
1363
1364/**
1365 * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4
1366 * @bat_priv: the bat priv with all the soft interface information
1367 * @skb: the multicast packet to transmit
1368 * @vid: the vlan identifier
1369 *
1370 * Sends copies of a frame with multicast destination to any node with a
1371 * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a
1372 * batman-adv unicast packet for each such destination node.
1373 *
1374 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1375 * otherwise.
1376 */
1377static int
1378batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv,
1379 struct sk_buff *skb, unsigned short vid)
1380{
1381 struct batadv_orig_node *orig_node;
1382 int ret = NET_XMIT_SUCCESS;
1383 struct sk_buff *newskb;
1384
1385 rcu_read_lock();
1386 hlist_for_each_entry_rcu(orig_node,
1387 &bat_priv->mcast.want_all_rtr4_list,
1388 mcast_want_all_rtr4_node) {
1389 newskb = skb_copy(skb, GFP_ATOMIC);
1390 if (!newskb) {
1391 ret = NET_XMIT_DROP;
1392 break;
1393 }
1394
1395 batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node);
1396 }
1397 rcu_read_unlock();
1398 return ret;
1399}
1400
1401/**
1402 * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6
1403 * @bat_priv: the bat priv with all the soft interface information
1404 * @skb: The multicast packet to transmit
1405 * @vid: the vlan identifier
1406 *
1407 * Sends copies of a frame with multicast destination to any node with a
1408 * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a
1409 * batman-adv unicast packet for each such destination node.
1410 *
1411 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
1412 * otherwise.
1413 */
1414static int
1415batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv,
1416 struct sk_buff *skb, unsigned short vid)
1417{
1418 struct batadv_orig_node *orig_node;
1419 int ret = NET_XMIT_SUCCESS;
1420 struct sk_buff *newskb;
1421
1422 rcu_read_lock();
1423 hlist_for_each_entry_rcu(orig_node,
1424 &bat_priv->mcast.want_all_rtr6_list,
1425 mcast_want_all_rtr6_node) {
1426 newskb = skb_copy(skb, GFP_ATOMIC);
1427 if (!newskb) {
1428 ret = NET_XMIT_DROP;
1429 break;
1430 }
1431
1432 batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node);
1433 }
1434 rcu_read_unlock();
1435 return ret;
1436}
1437
1438/**
1439 * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list
1440 * @bat_priv: the bat priv with all the soft interface information
1441 * @skb: the multicast packet to transmit
1442 * @vid: the vlan identifier
1443 *
1444 * Sends copies of a frame with multicast destination to any node with a
1445 * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A
1446 * transmission is performed via a batman-adv unicast packet for each such
1447 * destination node.
1448 *
1449 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1450 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1451 */
1452static int
1453batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv,
1454 struct sk_buff *skb, unsigned short vid)
1455{
1456 switch (ntohs(eth_hdr(skb)->h_proto)) {
1457 case ETH_P_IP:
1458 return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid);
1459 case ETH_P_IPV6:
1460 return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid);
1461 default:
1462 /* we shouldn't be here... */
1463 return NET_XMIT_DROP;
1464 }
1465}
1466
1467/**
1468 * batadv_mcast_forw_send() - send packet to any detected multicast recipient
1469 * @bat_priv: the bat priv with all the soft interface information
1470 * @skb: the multicast packet to transmit
1471 * @vid: the vlan identifier
1472 * @is_routable: stores whether the destination is routable
1473 *
1474 * Sends copies of a frame with multicast destination to any node that signaled
1475 * interest in it, that is either via the translation table or the according
1476 * want-all flags. A transmission is performed via a batman-adv unicast packet
1477 * for each such destination node.
1478 *
1479 * The given skb is consumed/freed.
1480 *
1481 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
1482 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
1483 */
1484int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
1485 unsigned short vid, int is_routable)
1486{
1487 int ret;
1488
1489 ret = batadv_mcast_forw_tt(bat_priv, skb, vid);
1490 if (ret != NET_XMIT_SUCCESS) {
1491 kfree_skb(skb);
1492 return ret;
1493 }
1494
1495 ret = batadv_mcast_forw_want_all(bat_priv, skb, vid);
1496 if (ret != NET_XMIT_SUCCESS) {
1497 kfree_skb(skb);
1498 return ret;
1499 }
1500
1501 if (!is_routable)
1502 goto skip_mc_router;
1503
1504 ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid);
1505 if (ret != NET_XMIT_SUCCESS) {
1506 kfree_skb(skb);
1507 return ret;
1508 }
1509
1510skip_mc_router:
1511 consume_skb(skb);
1512 return ret;
1513}
1514
1515/**
1516 * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list
1517 * @bat_priv: the bat priv with all the soft interface information
1518 * @orig: the orig_node which multicast state might have changed of
1519 * @mcast_flags: flags indicating the new multicast state
1520 *
1521 * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
1522 * orig, has toggled then this method updates the counter and the list
1523 * accordingly.
1524 *
1525 * Caller needs to hold orig->mcast_handler_lock.
1526 */
1527static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
1528 struct batadv_orig_node *orig,
1529 u8 mcast_flags)
1530{
1531 struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
1532 struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
1533
1534 lockdep_assert_held(&orig->mcast_handler_lock);
1535
1536 /* switched from flag unset to set */
1537 if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
1538 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
1539 atomic_inc(v: &bat_priv->mcast.num_want_all_unsnoopables);
1540
1541 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1542 /* flag checks above + mcast_handler_lock prevents this */
1543 WARN_ON(!hlist_unhashed(node));
1544
1545 hlist_add_head_rcu(n: node, h: head);
1546 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1547 /* switched from flag set to unset */
1548 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
1549 orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
1550 atomic_dec(v: &bat_priv->mcast.num_want_all_unsnoopables);
1551
1552 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1553 /* flag checks above + mcast_handler_lock prevents this */
1554 WARN_ON(hlist_unhashed(node));
1555
1556 hlist_del_init_rcu(n: node);
1557 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1558 }
1559}
1560
1561/**
1562 * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list
1563 * @bat_priv: the bat priv with all the soft interface information
1564 * @orig: the orig_node which multicast state might have changed of
1565 * @mcast_flags: flags indicating the new multicast state
1566 *
1567 * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
1568 * toggled then this method updates the counter and the list accordingly.
1569 *
1570 * Caller needs to hold orig->mcast_handler_lock.
1571 */
1572static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
1573 struct batadv_orig_node *orig,
1574 u8 mcast_flags)
1575{
1576 struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
1577 struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
1578
1579 lockdep_assert_held(&orig->mcast_handler_lock);
1580
1581 /* switched from flag unset to set */
1582 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
1583 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
1584 atomic_inc(v: &bat_priv->mcast.num_want_all_ipv4);
1585
1586 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1587 /* flag checks above + mcast_handler_lock prevents this */
1588 WARN_ON(!hlist_unhashed(node));
1589
1590 hlist_add_head_rcu(n: node, h: head);
1591 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1592 /* switched from flag set to unset */
1593 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
1594 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
1595 atomic_dec(v: &bat_priv->mcast.num_want_all_ipv4);
1596
1597 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1598 /* flag checks above + mcast_handler_lock prevents this */
1599 WARN_ON(hlist_unhashed(node));
1600
1601 hlist_del_init_rcu(n: node);
1602 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1603 }
1604}
1605
1606/**
1607 * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list
1608 * @bat_priv: the bat priv with all the soft interface information
1609 * @orig: the orig_node which multicast state might have changed of
1610 * @mcast_flags: flags indicating the new multicast state
1611 *
1612 * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
1613 * toggled then this method updates the counter and the list accordingly.
1614 *
1615 * Caller needs to hold orig->mcast_handler_lock.
1616 */
1617static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
1618 struct batadv_orig_node *orig,
1619 u8 mcast_flags)
1620{
1621 struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
1622 struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
1623
1624 lockdep_assert_held(&orig->mcast_handler_lock);
1625
1626 /* switched from flag unset to set */
1627 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
1628 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
1629 atomic_inc(v: &bat_priv->mcast.num_want_all_ipv6);
1630
1631 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1632 /* flag checks above + mcast_handler_lock prevents this */
1633 WARN_ON(!hlist_unhashed(node));
1634
1635 hlist_add_head_rcu(n: node, h: head);
1636 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1637 /* switched from flag set to unset */
1638 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
1639 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
1640 atomic_dec(v: &bat_priv->mcast.num_want_all_ipv6);
1641
1642 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1643 /* flag checks above + mcast_handler_lock prevents this */
1644 WARN_ON(hlist_unhashed(node));
1645
1646 hlist_del_init_rcu(n: node);
1647 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1648 }
1649}
1650
1651/**
1652 * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list
1653 * @bat_priv: the bat priv with all the soft interface information
1654 * @orig: the orig_node which multicast state might have changed of
1655 * @mcast_flags: flags indicating the new multicast state
1656 *
1657 * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has
1658 * toggled then this method updates the counter and the list accordingly.
1659 *
1660 * Caller needs to hold orig->mcast_handler_lock.
1661 */
1662static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv,
1663 struct batadv_orig_node *orig,
1664 u8 mcast_flags)
1665{
1666 struct hlist_node *node = &orig->mcast_want_all_rtr4_node;
1667 struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list;
1668
1669 lockdep_assert_held(&orig->mcast_handler_lock);
1670
1671 /* switched from flag set to unset */
1672 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) &&
1673 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) {
1674 atomic_inc(v: &bat_priv->mcast.num_want_all_rtr4);
1675
1676 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1677 /* flag checks above + mcast_handler_lock prevents this */
1678 WARN_ON(!hlist_unhashed(node));
1679
1680 hlist_add_head_rcu(n: node, h: head);
1681 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1682 /* switched from flag unset to set */
1683 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 &&
1684 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) {
1685 atomic_dec(v: &bat_priv->mcast.num_want_all_rtr4);
1686
1687 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1688 /* flag checks above + mcast_handler_lock prevents this */
1689 WARN_ON(hlist_unhashed(node));
1690
1691 hlist_del_init_rcu(n: node);
1692 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1693 }
1694}
1695
1696/**
1697 * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list
1698 * @bat_priv: the bat priv with all the soft interface information
1699 * @orig: the orig_node which multicast state might have changed of
1700 * @mcast_flags: flags indicating the new multicast state
1701 *
1702 * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has
1703 * toggled then this method updates the counter and the list accordingly.
1704 *
1705 * Caller needs to hold orig->mcast_handler_lock.
1706 */
1707static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv,
1708 struct batadv_orig_node *orig,
1709 u8 mcast_flags)
1710{
1711 struct hlist_node *node = &orig->mcast_want_all_rtr6_node;
1712 struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list;
1713
1714 lockdep_assert_held(&orig->mcast_handler_lock);
1715
1716 /* switched from flag set to unset */
1717 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) &&
1718 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) {
1719 atomic_inc(v: &bat_priv->mcast.num_want_all_rtr6);
1720
1721 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1722 /* flag checks above + mcast_handler_lock prevents this */
1723 WARN_ON(!hlist_unhashed(node));
1724
1725 hlist_add_head_rcu(n: node, h: head);
1726 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1727 /* switched from flag unset to set */
1728 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 &&
1729 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) {
1730 atomic_dec(v: &bat_priv->mcast.num_want_all_rtr6);
1731
1732 spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock);
1733 /* flag checks above + mcast_handler_lock prevents this */
1734 WARN_ON(hlist_unhashed(node));
1735
1736 hlist_del_init_rcu(n: node);
1737 spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock);
1738 }
1739}
1740
1741/**
1742 * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV
1743 * @enabled: whether the originator has multicast TVLV support enabled
1744 * @tvlv_value: tvlv buffer containing the multicast flags
1745 * @tvlv_value_len: tvlv buffer length
1746 *
1747 * Return: multicast flags for the given tvlv buffer
1748 */
1749static u8
1750batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len)
1751{
1752 u8 mcast_flags = BATADV_NO_FLAGS;
1753
1754 if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags))
1755 mcast_flags = *(u8 *)tvlv_value;
1756
1757 if (!enabled) {
1758 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4;
1759 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6;
1760 }
1761
1762 /* remove redundant flags to avoid sending duplicate packets later */
1763 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)
1764 mcast_flags |= BATADV_MCAST_WANT_NO_RTR4;
1765
1766 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)
1767 mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
1768
1769 return mcast_flags;
1770}
1771
1772/**
1773 * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container
1774 * @bat_priv: the bat priv with all the soft interface information
1775 * @orig: the orig_node of the ogm
1776 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
1777 * @tvlv_value: tvlv buffer containing the multicast data
1778 * @tvlv_value_len: tvlv buffer length
1779 */
1780static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
1781 struct batadv_orig_node *orig,
1782 u8 flags,
1783 void *tvlv_value,
1784 u16 tvlv_value_len)
1785{
1786 bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
1787 u8 mcast_flags;
1788
1789 mcast_flags = batadv_mcast_tvlv_flags_get(enabled: orig_mcast_enabled,
1790 tvlv_value, tvlv_value_len);
1791
1792 spin_lock_bh(lock: &orig->mcast_handler_lock);
1793
1794 if (orig_mcast_enabled &&
1795 !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
1796 set_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capabilities);
1797 } else if (!orig_mcast_enabled &&
1798 test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
1799 clear_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capabilities);
1800 }
1801
1802 set_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capa_initialized);
1803
1804 batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
1805 batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
1806 batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
1807 batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags);
1808 batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags);
1809
1810 orig->mcast_flags = mcast_flags;
1811 spin_unlock_bh(lock: &orig->mcast_handler_lock);
1812}
1813
1814/**
1815 * batadv_mcast_init() - initialize the multicast optimizations structures
1816 * @bat_priv: the bat priv with all the soft interface information
1817 */
1818void batadv_mcast_init(struct batadv_priv *bat_priv)
1819{
1820 batadv_tvlv_handler_register(bat_priv, optr: batadv_mcast_tvlv_ogm_handler,
1821 NULL, NULL, type: BATADV_TVLV_MCAST, version: 2,
1822 flags: BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
1823
1824 INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
1825 batadv_mcast_start_timer(bat_priv);
1826}
1827
1828/**
1829 * batadv_mcast_mesh_info_put() - put multicast info into a netlink message
1830 * @msg: buffer for the message
1831 * @bat_priv: the bat priv with all the soft interface information
1832 *
1833 * Return: 0 or error code.
1834 */
1835int batadv_mcast_mesh_info_put(struct sk_buff *msg,
1836 struct batadv_priv *bat_priv)
1837{
1838 u32 flags = bat_priv->mcast.mla_flags.tvlv_flags;
1839 u32 flags_priv = BATADV_NO_FLAGS;
1840
1841 if (bat_priv->mcast.mla_flags.bridged) {
1842 flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
1843
1844 if (bat_priv->mcast.mla_flags.querier_ipv4.exists)
1845 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
1846 if (bat_priv->mcast.mla_flags.querier_ipv6.exists)
1847 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
1848 if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing)
1849 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
1850 if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing)
1851 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
1852 }
1853
1854 if (nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS, value: flags) ||
1855 nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS_PRIV, value: flags_priv))
1856 return -EMSGSIZE;
1857
1858 return 0;
1859}
1860
1861/**
1862 * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
1863 * to a netlink socket
1864 * @msg: buffer for the message
1865 * @portid: netlink port
1866 * @cb: Control block containing additional options
1867 * @orig_node: originator to dump the multicast flags of
1868 *
1869 * Return: 0 or error code.
1870 */
1871static int
1872batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid,
1873 struct netlink_callback *cb,
1874 struct batadv_orig_node *orig_node)
1875{
1876 void *hdr;
1877
1878 hdr = genlmsg_put(skb: msg, portid, seq: cb->nlh->nlmsg_seq,
1879 family: &batadv_netlink_family, NLM_F_MULTI,
1880 cmd: BATADV_CMD_GET_MCAST_FLAGS);
1881 if (!hdr)
1882 return -ENOBUFS;
1883
1884 genl_dump_check_consistent(cb, user_hdr: hdr);
1885
1886 if (nla_put(skb: msg, attrtype: BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
1887 data: orig_node->orig)) {
1888 genlmsg_cancel(skb: msg, hdr);
1889 return -EMSGSIZE;
1890 }
1891
1892 if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
1893 &orig_node->capabilities)) {
1894 if (nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS,
1895 value: orig_node->mcast_flags)) {
1896 genlmsg_cancel(skb: msg, hdr);
1897 return -EMSGSIZE;
1898 }
1899 }
1900
1901 genlmsg_end(skb: msg, hdr);
1902 return 0;
1903}
1904
1905/**
1906 * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
1907 * table to a netlink socket
1908 * @msg: buffer for the message
1909 * @portid: netlink port
1910 * @cb: Control block containing additional options
1911 * @hash: hash to dump
1912 * @bucket: bucket index to dump
1913 * @idx_skip: How many entries to skip
1914 *
1915 * Return: 0 or error code.
1916 */
1917static int
1918batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid,
1919 struct netlink_callback *cb,
1920 struct batadv_hashtable *hash,
1921 unsigned int bucket, long *idx_skip)
1922{
1923 struct batadv_orig_node *orig_node;
1924 long idx = 0;
1925
1926 spin_lock_bh(lock: &hash->list_locks[bucket]);
1927 cb->seq = atomic_read(v: &hash->generation) << 1 | 1;
1928
1929 hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) {
1930 if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
1931 &orig_node->capa_initialized))
1932 continue;
1933
1934 if (idx < *idx_skip)
1935 goto skip;
1936
1937 if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) {
1938 spin_unlock_bh(lock: &hash->list_locks[bucket]);
1939 *idx_skip = idx;
1940
1941 return -EMSGSIZE;
1942 }
1943
1944skip:
1945 idx++;
1946 }
1947 spin_unlock_bh(lock: &hash->list_locks[bucket]);
1948
1949 return 0;
1950}
1951
1952/**
1953 * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
1954 * @msg: buffer for the message
1955 * @portid: netlink port
1956 * @cb: Control block containing additional options
1957 * @bat_priv: the bat priv with all the soft interface information
1958 * @bucket: current bucket to dump
1959 * @idx: index in current bucket to the next entry to dump
1960 *
1961 * Return: 0 or error code.
1962 */
1963static int
1964__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid,
1965 struct netlink_callback *cb,
1966 struct batadv_priv *bat_priv, long *bucket, long *idx)
1967{
1968 struct batadv_hashtable *hash = bat_priv->orig_hash;
1969 long bucket_tmp = *bucket;
1970 long idx_tmp = *idx;
1971
1972 while (bucket_tmp < hash->size) {
1973 if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash,
1974 bucket: bucket_tmp, idx_skip: &idx_tmp))
1975 break;
1976
1977 bucket_tmp++;
1978 idx_tmp = 0;
1979 }
1980
1981 *bucket = bucket_tmp;
1982 *idx = idx_tmp;
1983
1984 return msg->len;
1985}
1986
1987/**
1988 * batadv_mcast_netlink_get_primary() - get primary interface from netlink
1989 * callback
1990 * @cb: netlink callback structure
1991 * @primary_if: the primary interface pointer to return the result in
1992 *
1993 * Return: 0 or error code.
1994 */
1995static int
1996batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
1997 struct batadv_hard_iface **primary_if)
1998{
1999 struct batadv_hard_iface *hard_iface = NULL;
2000 struct net *net = sock_net(sk: cb->skb->sk);
2001 struct net_device *soft_iface;
2002 struct batadv_priv *bat_priv;
2003 int ifindex;
2004 int ret = 0;
2005
2006 ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, attrtype: BATADV_ATTR_MESH_IFINDEX);
2007 if (!ifindex)
2008 return -EINVAL;
2009
2010 soft_iface = dev_get_by_index(net, ifindex);
2011 if (!soft_iface || !batadv_softif_is_valid(net_dev: soft_iface)) {
2012 ret = -ENODEV;
2013 goto out;
2014 }
2015
2016 bat_priv = netdev_priv(dev: soft_iface);
2017
2018 hard_iface = batadv_primary_if_get_selected(bat_priv);
2019 if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
2020 ret = -ENOENT;
2021 goto out;
2022 }
2023
2024out:
2025 dev_put(dev: soft_iface);
2026
2027 if (!ret && primary_if)
2028 *primary_if = hard_iface;
2029 else
2030 batadv_hardif_put(hard_iface);
2031
2032 return ret;
2033}
2034
2035/**
2036 * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
2037 * @msg: buffer for the message
2038 * @cb: callback structure containing arguments
2039 *
2040 * Return: message length.
2041 */
2042int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
2043{
2044 struct batadv_hard_iface *primary_if = NULL;
2045 int portid = NETLINK_CB(cb->skb).portid;
2046 struct batadv_priv *bat_priv;
2047 long *bucket = &cb->args[0];
2048 long *idx = &cb->args[1];
2049 int ret;
2050
2051 ret = batadv_mcast_netlink_get_primary(cb, primary_if: &primary_if);
2052 if (ret)
2053 return ret;
2054
2055 bat_priv = netdev_priv(dev: primary_if->soft_iface);
2056 ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx);
2057
2058 batadv_hardif_put(hard_iface: primary_if);
2059 return ret;
2060}
2061
2062/**
2063 * batadv_mcast_free() - free the multicast optimizations structures
2064 * @bat_priv: the bat priv with all the soft interface information
2065 */
2066void batadv_mcast_free(struct batadv_priv *bat_priv)
2067{
2068 cancel_delayed_work_sync(dwork: &bat_priv->mcast.work);
2069
2070 batadv_tvlv_container_unregister(bat_priv, type: BATADV_TVLV_MCAST, version: 2);
2071 batadv_tvlv_handler_unregister(bat_priv, type: BATADV_TVLV_MCAST, version: 2);
2072
2073 /* safely calling outside of worker, as worker was canceled above */
2074 batadv_mcast_mla_tt_retract(bat_priv, NULL);
2075}
2076
2077/**
2078 * batadv_mcast_purge_orig() - reset originator global mcast state modifications
2079 * @orig: the originator which is going to get purged
2080 */
2081void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
2082{
2083 struct batadv_priv *bat_priv = orig->bat_priv;
2084
2085 spin_lock_bh(lock: &orig->mcast_handler_lock);
2086
2087 batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
2088 batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
2089 batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
2090 batadv_mcast_want_rtr4_update(bat_priv, orig,
2091 mcast_flags: BATADV_MCAST_WANT_NO_RTR4);
2092 batadv_mcast_want_rtr6_update(bat_priv, orig,
2093 mcast_flags: BATADV_MCAST_WANT_NO_RTR6);
2094
2095 spin_unlock_bh(lock: &orig->mcast_handler_lock);
2096}
2097

source code of linux/net/batman-adv/multicast.c