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0046b040 | 1 | /* Copyright (C) 2014-2016 B.A.T.M.A.N. contributors: |
c5caf4ef LL |
2 | * |
3 | * Linus Lüssing | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
c5caf4ef | 18 | #include "multicast.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
9c936e3f | 22 | #include <linux/bitops.h> |
8a4023c5 | 23 | #include <linux/bug.h> |
1e2c2a4f SE |
24 | #include <linux/byteorder/generic.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
bd2a979e | 28 | #include <linux/icmpv6.h> |
687937ab | 29 | #include <linux/if_bridge.h> |
1e2c2a4f | 30 | #include <linux/if_ether.h> |
bd2a979e | 31 | #include <linux/igmp.h> |
1e2c2a4f | 32 | #include <linux/in.h> |
bd2a979e | 33 | #include <linux/in6.h> |
1e2c2a4f SE |
34 | #include <linux/ip.h> |
35 | #include <linux/ipv6.h> | |
7c124391 | 36 | #include <linux/kref.h> |
1e2c2a4f | 37 | #include <linux/list.h> |
2c72d655 | 38 | #include <linux/lockdep.h> |
1e2c2a4f | 39 | #include <linux/netdevice.h> |
687937ab | 40 | #include <linux/printk.h> |
1e2c2a4f SE |
41 | #include <linux/rculist.h> |
42 | #include <linux/rcupdate.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/stddef.h> | |
47 | #include <linux/string.h> | |
48 | #include <linux/types.h> | |
49 | #include <net/addrconf.h> | |
687937ab LL |
50 | #include <net/if_inet6.h> |
51 | #include <net/ip.h> | |
1e2c2a4f SE |
52 | #include <net/ipv6.h> |
53 | ||
54 | #include "packet.h" | |
c5caf4ef LL |
55 | #include "translation-table.h" |
56 | ||
687937ab LL |
57 | /** |
58 | * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists | |
59 | * @soft_iface: netdev struct of the mesh interface | |
60 | * | |
61 | * If the given soft interface has a bridge on top then the refcount | |
62 | * of the according net device is increased. | |
63 | * | |
64 | * Return: NULL if no such bridge exists. Otherwise the net device of the | |
65 | * bridge. | |
66 | */ | |
67 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) | |
68 | { | |
69 | struct net_device *upper = soft_iface; | |
70 | ||
71 | rcu_read_lock(); | |
72 | do { | |
73 | upper = netdev_master_upper_dev_get_rcu(upper); | |
74 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
75 | ||
76 | if (upper) | |
77 | dev_hold(upper); | |
78 | rcu_read_unlock(); | |
79 | ||
80 | return upper; | |
81 | } | |
82 | ||
c5caf4ef LL |
83 | /** |
84 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
85 | * @dev: the device to collect multicast addresses from | |
86 | * @mcast_list: a list to put found addresses into | |
87 | * | |
687937ab LL |
88 | * Collects multicast addresses of multicast listeners residing |
89 | * on this kernel on the given soft interface, dev, in | |
90 | * the given mcast_list. In general, multicast listeners provided by | |
91 | * your multicast receiving applications run directly on this node. | |
92 | * | |
93 | * If there is a bridge interface on top of dev, collects from that one | |
94 | * instead. Just like with IP addresses and routes, multicast listeners | |
95 | * will(/should) register to the bridge interface instead of an | |
96 | * enslaved bat0. | |
c5caf4ef | 97 | * |
62fe710f | 98 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
99 | * items added to the mcast_list otherwise. |
100 | */ | |
101 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
102 | struct hlist_head *mcast_list) | |
103 | { | |
687937ab | 104 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
c5caf4ef LL |
105 | struct netdev_hw_addr *mc_list_entry; |
106 | struct batadv_hw_addr *new; | |
107 | int ret = 0; | |
108 | ||
687937ab LL |
109 | netif_addr_lock_bh(bridge ? bridge : dev); |
110 | netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { | |
c5caf4ef LL |
111 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
112 | if (!new) { | |
113 | ret = -ENOMEM; | |
114 | break; | |
115 | } | |
116 | ||
117 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
118 | hlist_add_head(&new->list, mcast_list); | |
119 | ret++; | |
120 | } | |
687937ab LL |
121 | netif_addr_unlock_bh(bridge ? bridge : dev); |
122 | ||
123 | if (bridge) | |
124 | dev_put(bridge); | |
c5caf4ef LL |
125 | |
126 | return ret; | |
127 | } | |
128 | ||
129 | /** | |
130 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
131 | * @mcast_addr: the multicast address to check | |
132 | * @mcast_list: the list with multicast addresses to search in | |
133 | * | |
62fe710f | 134 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
135 | * Otherwise returns false. |
136 | */ | |
6b5e971a | 137 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
138 | struct hlist_head *mcast_list) |
139 | { | |
140 | struct batadv_hw_addr *mcast_entry; | |
141 | ||
142 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
143 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
144 | return true; | |
145 | ||
146 | return false; | |
147 | } | |
148 | ||
687937ab LL |
149 | /** |
150 | * batadv_mcast_mla_br_addr_cpy - copy a bridge multicast address | |
151 | * @dst: destination to write to - a multicast MAC address | |
152 | * @src: source to read from - a multicast IP address | |
153 | * | |
154 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
155 | * to its matching multicast MAC address and copies it into the given | |
156 | * destination buffer. | |
157 | * | |
158 | * Caller needs to make sure the destination buffer can hold | |
159 | * at least ETH_ALEN bytes. | |
160 | */ | |
161 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
162 | { | |
163 | if (src->proto == htons(ETH_P_IP)) | |
164 | ip_eth_mc_map(src->u.ip4, dst); | |
165 | #if IS_ENABLED(CONFIG_IPV6) | |
166 | else if (src->proto == htons(ETH_P_IPV6)) | |
167 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
168 | #endif | |
169 | else | |
170 | eth_zero_addr(dst); | |
171 | } | |
172 | ||
173 | /** | |
174 | * batadv_mcast_mla_bridge_get - get bridged-in multicast listeners | |
175 | * @dev: a bridge slave whose bridge to collect multicast addresses from | |
176 | * @mcast_list: a list to put found addresses into | |
177 | * | |
178 | * Collects multicast addresses of multicast listeners residing | |
179 | * on foreign, non-mesh devices which we gave access to our mesh via | |
180 | * a bridge on top of the given soft interface, dev, in the given | |
181 | * mcast_list. | |
182 | * | |
183 | * Return: -ENOMEM on memory allocation error or the number of | |
184 | * items added to the mcast_list otherwise. | |
185 | */ | |
186 | static int batadv_mcast_mla_bridge_get(struct net_device *dev, | |
187 | struct hlist_head *mcast_list) | |
188 | { | |
189 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
190 | struct br_ip_list *br_ip_entry, *tmp; | |
191 | struct batadv_hw_addr *new; | |
192 | u8 mcast_addr[ETH_ALEN]; | |
193 | int ret; | |
194 | ||
195 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
196 | * snooping code of the Linux bridge already does that for us | |
197 | */ | |
198 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
199 | if (ret < 0) | |
200 | goto out; | |
201 | ||
202 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
203 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); | |
204 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
205 | continue; | |
206 | ||
207 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
208 | if (!new) { | |
209 | ret = -ENOMEM; | |
210 | break; | |
211 | } | |
212 | ||
213 | ether_addr_copy(new->addr, mcast_addr); | |
214 | hlist_add_head(&new->list, mcast_list); | |
215 | } | |
216 | ||
217 | out: | |
218 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
219 | list_del(&br_ip_entry->list); | |
220 | kfree(br_ip_entry); | |
221 | } | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
c5caf4ef LL |
226 | /** |
227 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
2c72d655 | 228 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
229 | * @mcast_list: the list to free |
230 | * | |
231 | * Removes and frees all items in the given mcast_list. | |
232 | */ | |
2c72d655 SE |
233 | static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv, |
234 | struct hlist_head *mcast_list) | |
c5caf4ef LL |
235 | { |
236 | struct batadv_hw_addr *mcast_entry; | |
237 | struct hlist_node *tmp; | |
238 | ||
2c72d655 SE |
239 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
240 | ||
c5caf4ef LL |
241 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
242 | hlist_del(&mcast_entry->list); | |
243 | kfree(mcast_entry); | |
244 | } | |
245 | } | |
246 | ||
247 | /** | |
248 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
249 | * @bat_priv: the bat priv with all the soft interface information | |
250 | * @mcast_list: a list of addresses which should _not_ be removed | |
251 | * | |
252 | * Retracts the announcement of any multicast listener from the | |
253 | * translation table except the ones listed in the given mcast_list. | |
254 | * | |
255 | * If mcast_list is NULL then all are retracted. | |
256 | */ | |
257 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
258 | struct hlist_head *mcast_list) | |
259 | { | |
260 | struct batadv_hw_addr *mcast_entry; | |
261 | struct hlist_node *tmp; | |
262 | ||
2c72d655 SE |
263 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
264 | ||
c5caf4ef LL |
265 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
266 | list) { | |
267 | if (mcast_list && | |
268 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
269 | mcast_list)) | |
270 | continue; | |
271 | ||
272 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
273 | BATADV_NO_FLAGS, | |
274 | "mcast TT outdated", false); | |
275 | ||
276 | hlist_del(&mcast_entry->list); | |
277 | kfree(mcast_entry); | |
278 | } | |
279 | } | |
280 | ||
281 | /** | |
282 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
283 | * @bat_priv: the bat priv with all the soft interface information | |
284 | * @mcast_list: a list of addresses which are going to get added | |
285 | * | |
286 | * Adds multicast listener announcements from the given mcast_list to the | |
287 | * translation table if they have not been added yet. | |
288 | */ | |
289 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
290 | struct hlist_head *mcast_list) | |
291 | { | |
292 | struct batadv_hw_addr *mcast_entry; | |
293 | struct hlist_node *tmp; | |
294 | ||
2c72d655 SE |
295 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
296 | ||
c5caf4ef LL |
297 | if (!mcast_list) |
298 | return; | |
299 | ||
300 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
301 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
302 | &bat_priv->mcast.mla_list)) | |
303 | continue; | |
304 | ||
305 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
306 | mcast_entry->addr, BATADV_NO_FLAGS, | |
307 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
308 | continue; | |
309 | ||
310 | hlist_del(&mcast_entry->list); | |
311 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
312 | } | |
313 | } | |
314 | ||
315 | /** | |
316 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
317 | * @bat_priv: the bat priv with all the soft interface information | |
318 | * | |
62fe710f SE |
319 | * Checks whether there is a bridge on top of our soft interface. |
320 | * | |
321 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
322 | */ |
323 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
324 | { | |
325 | struct net_device *upper = bat_priv->soft_iface; | |
326 | ||
327 | rcu_read_lock(); | |
328 | do { | |
329 | upper = netdev_master_upper_dev_get_rcu(upper); | |
330 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
331 | rcu_read_unlock(); | |
332 | ||
333 | return upper; | |
334 | } | |
335 | ||
60432d75 LL |
336 | /** |
337 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
338 | * @bat_priv: the bat priv with all the soft interface information | |
339 | * | |
340 | * Updates the own multicast tvlv with our current multicast related settings, | |
341 | * capabilities and inabilities. | |
342 | * | |
687937ab LL |
343 | * Return: false if we want all IPv4 && IPv6 multicast traffic and true |
344 | * otherwise. | |
60432d75 LL |
345 | */ |
346 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
347 | { | |
348 | struct batadv_tvlv_mcast_data mcast_data; | |
687937ab LL |
349 | struct batadv_mcast_querier_state querier4 = {false, false}; |
350 | struct batadv_mcast_querier_state querier6 = {false, false}; | |
351 | struct net_device *dev = bat_priv->soft_iface; | |
60432d75 LL |
352 | |
353 | mcast_data.flags = BATADV_NO_FLAGS; | |
354 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
355 | ||
687937ab LL |
356 | bat_priv->mcast.bridged = batadv_mcast_has_bridge(bat_priv); |
357 | if (!bat_priv->mcast.bridged) | |
358 | goto update; | |
359 | ||
360 | #if !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING) | |
361 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
362 | #endif | |
363 | ||
364 | querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
365 | querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
366 | ||
367 | querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
368 | querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
369 | ||
370 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
371 | ||
372 | /* 1) If no querier exists at all, then multicast listeners on | |
373 | * our local TT clients behind the bridge will keep silent. | |
374 | * 2) If the selected querier is on one of our local TT clients, | |
375 | * behind the bridge, then this querier might shadow multicast | |
376 | * listeners on our local TT clients, behind this bridge. | |
377 | * | |
378 | * In both cases, we will signalize other batman nodes that | |
379 | * we need all multicast traffic of the according protocol. | |
60432d75 | 380 | */ |
687937ab LL |
381 | if (!querier4.exists || querier4.shadowing) |
382 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
60432d75 | 383 | |
687937ab LL |
384 | if (!querier6.exists || querier6.shadowing) |
385 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
60432d75 | 386 | |
687937ab | 387 | update: |
60432d75 LL |
388 | if (!bat_priv->mcast.enabled || |
389 | mcast_data.flags != bat_priv->mcast.flags) { | |
bd2a979e | 390 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
60432d75 LL |
391 | &mcast_data, sizeof(mcast_data)); |
392 | bat_priv->mcast.flags = mcast_data.flags; | |
393 | bat_priv->mcast.enabled = true; | |
394 | } | |
395 | ||
687937ab LL |
396 | return !(mcast_data.flags & |
397 | (BATADV_MCAST_WANT_ALL_IPV4 + BATADV_MCAST_WANT_ALL_IPV6)); | |
60432d75 LL |
398 | } |
399 | ||
c5caf4ef LL |
400 | /** |
401 | * batadv_mcast_mla_update - update the own MLAs | |
402 | * @bat_priv: the bat priv with all the soft interface information | |
403 | * | |
60432d75 LL |
404 | * Updates the own multicast listener announcements in the translation |
405 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
406 | */ |
407 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
408 | { | |
409 | struct net_device *soft_iface = bat_priv->soft_iface; | |
410 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
411 | int ret; | |
412 | ||
60432d75 | 413 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
414 | goto update; |
415 | ||
416 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
417 | if (ret < 0) | |
418 | goto out; | |
419 | ||
687937ab LL |
420 | ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); |
421 | if (ret < 0) | |
422 | goto out; | |
423 | ||
c5caf4ef LL |
424 | update: |
425 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
426 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
427 | ||
428 | out: | |
2c72d655 | 429 | batadv_mcast_mla_list_free(bat_priv, &mcast_list); |
c5caf4ef LL |
430 | } |
431 | ||
bd2a979e LL |
432 | /** |
433 | * batadv_mcast_is_report_ipv4 - check for IGMP reports | |
434 | * @skb: the ethernet frame destined for the mesh | |
435 | * | |
436 | * This call might reallocate skb data. | |
437 | * | |
438 | * Checks whether the given frame is a valid IGMP report. | |
439 | * | |
440 | * Return: If so then true, otherwise false. | |
441 | */ | |
442 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
443 | { | |
444 | if (ip_mc_check_igmp(skb, NULL) < 0) | |
445 | return false; | |
446 | ||
447 | switch (igmp_hdr(skb)->type) { | |
448 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
449 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
450 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
451 | return true; | |
452 | } | |
453 | ||
454 | return false; | |
455 | } | |
456 | ||
ab49886e LL |
457 | /** |
458 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
459 | * @bat_priv: the bat priv with all the soft interface information | |
460 | * @skb: the IPv4 packet to check | |
461 | * @is_unsnoopable: stores whether the destination is snoopable | |
462 | * | |
463 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
464 | * mode more optimal than classic flooding. | |
465 | * | |
62fe710f SE |
466 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
467 | * allocation failure. | |
ab49886e LL |
468 | */ |
469 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
470 | struct sk_buff *skb, | |
471 | bool *is_unsnoopable) | |
472 | { | |
473 | struct iphdr *iphdr; | |
474 | ||
475 | /* We might fail due to out-of-memory -> drop it */ | |
476 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
477 | return -ENOMEM; | |
478 | ||
bd2a979e LL |
479 | if (batadv_mcast_is_report_ipv4(skb)) |
480 | return -EINVAL; | |
481 | ||
ab49886e LL |
482 | iphdr = ip_hdr(skb); |
483 | ||
484 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
485 | * then allow scope > link local, too | |
486 | */ | |
487 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
488 | return -EINVAL; | |
489 | ||
490 | /* link-local multicast listeners behind a bridge are | |
491 | * not snoopable (see RFC4541, section 2.1.2.2) | |
492 | */ | |
493 | *is_unsnoopable = true; | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
bd2a979e LL |
498 | #if IS_ENABLED(CONFIG_IPV6) |
499 | /** | |
500 | * batadv_mcast_is_report_ipv6 - check for MLD reports | |
501 | * @skb: the ethernet frame destined for the mesh | |
502 | * | |
503 | * This call might reallocate skb data. | |
504 | * | |
505 | * Checks whether the given frame is a valid MLD report. | |
506 | * | |
507 | * Return: If so then true, otherwise false. | |
508 | */ | |
509 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
510 | { | |
511 | if (ipv6_mc_check_mld(skb, NULL) < 0) | |
512 | return false; | |
513 | ||
514 | switch (icmp6_hdr(skb)->icmp6_type) { | |
515 | case ICMPV6_MGM_REPORT: | |
516 | case ICMPV6_MLD2_REPORT: | |
517 | return true; | |
518 | } | |
519 | ||
520 | return false; | |
521 | } | |
522 | ||
1d8ab8d3 LL |
523 | /** |
524 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
525 | * @bat_priv: the bat priv with all the soft interface information | |
526 | * @skb: the IPv6 packet to check | |
ab49886e | 527 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
528 | * |
529 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
530 | * mode more optimal than classic flooding. | |
531 | * | |
62fe710f | 532 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
533 | */ |
534 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
535 | struct sk_buff *skb, |
536 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
537 | { |
538 | struct ipv6hdr *ip6hdr; | |
539 | ||
540 | /* We might fail due to out-of-memory -> drop it */ | |
541 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
542 | return -ENOMEM; | |
543 | ||
bd2a979e LL |
544 | if (batadv_mcast_is_report_ipv6(skb)) |
545 | return -EINVAL; | |
546 | ||
1d8ab8d3 LL |
547 | ip6hdr = ipv6_hdr(skb); |
548 | ||
549 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
550 | * then allow scope > link local, too | |
551 | */ | |
552 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
553 | return -EINVAL; | |
554 | ||
555 | /* link-local-all-nodes multicast listeners behind a bridge are | |
556 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
557 | */ | |
558 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 559 | *is_unsnoopable = true; |
1d8ab8d3 LL |
560 | |
561 | return 0; | |
562 | } | |
bd2a979e | 563 | #endif |
1d8ab8d3 LL |
564 | |
565 | /** | |
566 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
567 | * @bat_priv: the bat priv with all the soft interface information | |
568 | * @skb: the multicast frame to check | |
ab49886e | 569 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
570 | * |
571 | * Checks whether the given multicast ethernet frame has the potential to be | |
572 | * forwarded with a mode more optimal than classic flooding. | |
573 | * | |
62fe710f | 574 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
575 | */ |
576 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
577 | struct sk_buff *skb, |
578 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
579 | { |
580 | struct ethhdr *ethhdr = eth_hdr(skb); | |
581 | ||
582 | if (!atomic_read(&bat_priv->multicast_mode)) | |
583 | return -EINVAL; | |
584 | ||
585 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
586 | return -EINVAL; | |
587 | ||
588 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
589 | case ETH_P_IP: |
590 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
591 | is_unsnoopable); | |
bd2a979e | 592 | #if IS_ENABLED(CONFIG_IPV6) |
1d8ab8d3 | 593 | case ETH_P_IPV6: |
ab49886e LL |
594 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
595 | is_unsnoopable); | |
bd2a979e | 596 | #endif |
1d8ab8d3 LL |
597 | default: |
598 | return -EINVAL; | |
599 | } | |
600 | } | |
601 | ||
4c8755d6 | 602 | /** |
6d030de8 AQ |
603 | * batadv_mcast_forw_want_all_ip_count - count nodes with unspecific mcast |
604 | * interest | |
4c8755d6 LL |
605 | * @bat_priv: the bat priv with all the soft interface information |
606 | * @ethhdr: ethernet header of a packet | |
607 | * | |
62fe710f | 608 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
609 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
610 | * IPv6 traffic if it matches an IPv6 packet. | |
611 | */ | |
612 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
613 | struct ethhdr *ethhdr) | |
614 | { | |
615 | switch (ntohs(ethhdr->h_proto)) { | |
616 | case ETH_P_IP: | |
617 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
618 | case ETH_P_IPV6: | |
619 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
620 | default: | |
621 | /* we shouldn't be here... */ | |
622 | return 0; | |
623 | } | |
624 | } | |
625 | ||
1d8ab8d3 LL |
626 | /** |
627 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
628 | * @bat_priv: the bat priv with all the soft interface information | |
629 | * @ethhdr: the ether header containing the multicast destination | |
630 | * | |
62fe710f | 631 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
632 | * via a translation table lookup. This increases the returned nodes refcount. |
633 | */ | |
634 | static struct batadv_orig_node * | |
635 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
636 | struct ethhdr *ethhdr) | |
637 | { | |
638 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
639 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
640 | } | |
641 | ||
4c8755d6 | 642 | /** |
6d030de8 | 643 | * batadv_mcast_forw_ipv4_node_get - get a node with an ipv4 flag |
4c8755d6 LL |
644 | * @bat_priv: the bat priv with all the soft interface information |
645 | * | |
62fe710f | 646 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
647 | * increases its refcount. |
648 | */ | |
649 | static struct batadv_orig_node * | |
650 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
651 | { | |
652 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
653 | ||
654 | rcu_read_lock(); | |
655 | hlist_for_each_entry_rcu(tmp_orig_node, | |
656 | &bat_priv->mcast.want_all_ipv4_list, | |
657 | mcast_want_all_ipv4_node) { | |
7c124391 | 658 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
659 | continue; |
660 | ||
661 | orig_node = tmp_orig_node; | |
662 | break; | |
663 | } | |
664 | rcu_read_unlock(); | |
665 | ||
666 | return orig_node; | |
667 | } | |
668 | ||
669 | /** | |
6d030de8 | 670 | * batadv_mcast_forw_ipv6_node_get - get a node with an ipv6 flag |
4c8755d6 LL |
671 | * @bat_priv: the bat priv with all the soft interface information |
672 | * | |
62fe710f | 673 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
674 | * and increases its refcount. |
675 | */ | |
676 | static struct batadv_orig_node * | |
677 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
678 | { | |
679 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
680 | ||
681 | rcu_read_lock(); | |
682 | hlist_for_each_entry_rcu(tmp_orig_node, | |
683 | &bat_priv->mcast.want_all_ipv6_list, | |
684 | mcast_want_all_ipv6_node) { | |
7c124391 | 685 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
686 | continue; |
687 | ||
688 | orig_node = tmp_orig_node; | |
689 | break; | |
690 | } | |
691 | rcu_read_unlock(); | |
692 | ||
693 | return orig_node; | |
694 | } | |
695 | ||
696 | /** | |
6d030de8 | 697 | * batadv_mcast_forw_ip_node_get - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
698 | * @bat_priv: the bat priv with all the soft interface information |
699 | * @ethhdr: an ethernet header to determine the protocol family from | |
700 | * | |
62fe710f | 701 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
702 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
703 | * increases its refcount. | |
704 | */ | |
705 | static struct batadv_orig_node * | |
706 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
707 | struct ethhdr *ethhdr) | |
708 | { | |
709 | switch (ntohs(ethhdr->h_proto)) { | |
710 | case ETH_P_IP: | |
711 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
712 | case ETH_P_IPV6: | |
713 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
714 | default: | |
715 | /* we shouldn't be here... */ | |
716 | return NULL; | |
717 | } | |
718 | } | |
719 | ||
ab49886e | 720 | /** |
6d030de8 | 721 | * batadv_mcast_forw_unsnoop_node_get - get a node with an unsnoopable flag |
ab49886e LL |
722 | * @bat_priv: the bat priv with all the soft interface information |
723 | * | |
62fe710f | 724 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
725 | * set and increases its refcount. |
726 | */ | |
727 | static struct batadv_orig_node * | |
728 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
729 | { | |
730 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
731 | ||
732 | rcu_read_lock(); | |
733 | hlist_for_each_entry_rcu(tmp_orig_node, | |
734 | &bat_priv->mcast.want_all_unsnoopables_list, | |
735 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 736 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
737 | continue; |
738 | ||
739 | orig_node = tmp_orig_node; | |
740 | break; | |
741 | } | |
742 | rcu_read_unlock(); | |
743 | ||
744 | return orig_node; | |
745 | } | |
746 | ||
1d8ab8d3 LL |
747 | /** |
748 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
749 | * @bat_priv: the bat priv with all the soft interface information | |
750 | * @skb: The multicast packet to check | |
751 | * @orig: an originator to be set to forward the skb to | |
752 | * | |
62fe710f | 753 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
754 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
755 | * should be forwarded to. | |
756 | */ | |
757 | enum batadv_forw_mode | |
758 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
759 | struct batadv_orig_node **orig) | |
760 | { | |
4c8755d6 | 761 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 762 | bool is_unsnoopable = false; |
1d8ab8d3 | 763 | struct ethhdr *ethhdr; |
1d8ab8d3 | 764 | |
ab49886e | 765 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
766 | if (ret == -ENOMEM) |
767 | return BATADV_FORW_NONE; | |
768 | else if (ret < 0) | |
769 | return BATADV_FORW_ALL; | |
770 | ||
771 | ethhdr = eth_hdr(skb); | |
772 | ||
773 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
774 | BATADV_NO_FLAGS); | |
4c8755d6 | 775 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
776 | unsnoop_count = !is_unsnoopable ? 0 : |
777 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
778 | ||
4c8755d6 | 779 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 780 | |
ab49886e | 781 | switch (total_count) { |
1d8ab8d3 | 782 | case 1: |
ab49886e LL |
783 | if (tt_count) |
784 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
785 | else if (ip_count) |
786 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
787 | else if (unsnoop_count) |
788 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
789 | ||
1d8ab8d3 LL |
790 | if (*orig) |
791 | return BATADV_FORW_SINGLE; | |
792 | ||
793 | /* fall through */ | |
794 | case 0: | |
795 | return BATADV_FORW_NONE; | |
796 | default: | |
797 | return BATADV_FORW_ALL; | |
798 | } | |
799 | } | |
800 | ||
ab49886e LL |
801 | /** |
802 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
803 | * @bat_priv: the bat priv with all the soft interface information | |
804 | * @orig: the orig_node which multicast state might have changed of | |
805 | * @mcast_flags: flags indicating the new multicast state | |
806 | * | |
807 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
808 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
809 | * |
810 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
811 | */ |
812 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
813 | struct batadv_orig_node *orig, | |
6b5e971a | 814 | u8 mcast_flags) |
ab49886e | 815 | { |
8a4023c5 LL |
816 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
817 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
818 | ||
5274cd68 SE |
819 | lockdep_assert_held(&orig->mcast_handler_lock); |
820 | ||
ab49886e LL |
821 | /* switched from flag unset to set */ |
822 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
823 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
824 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
825 | ||
826 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
827 | /* flag checks above + mcast_handler_lock prevents this */ |
828 | WARN_ON(!hlist_unhashed(node)); | |
829 | ||
830 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
831 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
832 | /* switched from flag set to unset */ | |
833 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
834 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
835 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
836 | ||
837 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
838 | /* flag checks above + mcast_handler_lock prevents this */ |
839 | WARN_ON(hlist_unhashed(node)); | |
840 | ||
841 | hlist_del_init_rcu(node); | |
ab49886e LL |
842 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
843 | } | |
844 | } | |
845 | ||
4c8755d6 LL |
846 | /** |
847 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
848 | * @bat_priv: the bat priv with all the soft interface information | |
849 | * @orig: the orig_node which multicast state might have changed of | |
850 | * @mcast_flags: flags indicating the new multicast state | |
851 | * | |
852 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
853 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
854 | * |
855 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
856 | */ |
857 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
858 | struct batadv_orig_node *orig, | |
6b5e971a | 859 | u8 mcast_flags) |
4c8755d6 | 860 | { |
8a4023c5 LL |
861 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
862 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
863 | ||
5274cd68 SE |
864 | lockdep_assert_held(&orig->mcast_handler_lock); |
865 | ||
4c8755d6 LL |
866 | /* switched from flag unset to set */ |
867 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
868 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
869 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
870 | ||
871 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
872 | /* flag checks above + mcast_handler_lock prevents this */ |
873 | WARN_ON(!hlist_unhashed(node)); | |
874 | ||
875 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
876 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
877 | /* switched from flag set to unset */ | |
878 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
879 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
880 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
881 | ||
882 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
883 | /* flag checks above + mcast_handler_lock prevents this */ |
884 | WARN_ON(hlist_unhashed(node)); | |
885 | ||
886 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
887 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
888 | } | |
889 | } | |
890 | ||
891 | /** | |
892 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
893 | * @bat_priv: the bat priv with all the soft interface information | |
894 | * @orig: the orig_node which multicast state might have changed of | |
895 | * @mcast_flags: flags indicating the new multicast state | |
896 | * | |
897 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
898 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
899 | * |
900 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
901 | */ |
902 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
903 | struct batadv_orig_node *orig, | |
6b5e971a | 904 | u8 mcast_flags) |
4c8755d6 | 905 | { |
8a4023c5 LL |
906 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
907 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
908 | ||
5274cd68 SE |
909 | lockdep_assert_held(&orig->mcast_handler_lock); |
910 | ||
4c8755d6 LL |
911 | /* switched from flag unset to set */ |
912 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
913 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
914 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
915 | ||
916 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
917 | /* flag checks above + mcast_handler_lock prevents this */ |
918 | WARN_ON(!hlist_unhashed(node)); | |
919 | ||
920 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
921 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
922 | /* switched from flag set to unset */ | |
923 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
924 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
925 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
926 | ||
927 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
928 | /* flag checks above + mcast_handler_lock prevents this */ |
929 | WARN_ON(hlist_unhashed(node)); | |
930 | ||
931 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
932 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
933 | } | |
934 | } | |
935 | ||
60432d75 | 936 | /** |
bd2a979e | 937 | * batadv_mcast_tvlv_ogm_handler - process incoming multicast tvlv container |
60432d75 LL |
938 | * @bat_priv: the bat priv with all the soft interface information |
939 | * @orig: the orig_node of the ogm | |
940 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
941 | * @tvlv_value: tvlv buffer containing the multicast data | |
942 | * @tvlv_value_len: tvlv buffer length | |
943 | */ | |
bd2a979e LL |
944 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
945 | struct batadv_orig_node *orig, | |
946 | u8 flags, | |
947 | void *tvlv_value, | |
948 | u16 tvlv_value_len) | |
60432d75 LL |
949 | { |
950 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 951 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
952 | bool orig_initialized; |
953 | ||
8a4023c5 LL |
954 | if (orig_mcast_enabled && tvlv_value && |
955 | (tvlv_value_len >= sizeof(mcast_flags))) | |
6b5e971a | 956 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
957 | |
958 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
959 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
960 | &orig->capa_initialized); | |
60432d75 LL |
961 | |
962 | /* If mcast support is turned on decrease the disabled mcast node | |
963 | * counter only if we had increased it for this node before. If this | |
964 | * is a completely new orig_node no need to decrease the counter. | |
965 | */ | |
966 | if (orig_mcast_enabled && | |
9c936e3f | 967 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
968 | if (orig_initialized) |
969 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 970 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
971 | /* If mcast support is being switched off or if this is an initial |
972 | * OGM without mcast support then increase the disabled mcast | |
973 | * node counter. | |
60432d75 LL |
974 | */ |
975 | } else if (!orig_mcast_enabled && | |
9c936e3f | 976 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 977 | !orig_initialized)) { |
60432d75 | 978 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 979 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
980 | } |
981 | ||
9c936e3f | 982 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 983 | |
ab49886e | 984 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
985 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
986 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 987 | |
60432d75 | 988 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 989 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
990 | } |
991 | ||
992 | /** | |
993 | * batadv_mcast_init - initialize the multicast optimizations structures | |
994 | * @bat_priv: the bat priv with all the soft interface information | |
995 | */ | |
996 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
997 | { | |
bd2a979e LL |
998 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
999 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 LL |
1000 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
1001 | } | |
1002 | ||
c5caf4ef LL |
1003 | /** |
1004 | * batadv_mcast_free - free the multicast optimizations structures | |
1005 | * @bat_priv: the bat priv with all the soft interface information | |
1006 | */ | |
1007 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
1008 | { | |
bd2a979e LL |
1009 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
1010 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 1011 | |
af63cf51 | 1012 | spin_lock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 1013 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
af63cf51 | 1014 | spin_unlock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 1015 | } |
60432d75 LL |
1016 | |
1017 | /** | |
1018 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
1019 | * @orig: the originator which is going to get purged | |
1020 | */ | |
1021 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
1022 | { | |
1023 | struct batadv_priv *bat_priv = orig->bat_priv; | |
1024 | ||
8a4023c5 LL |
1025 | spin_lock_bh(&orig->mcast_handler_lock); |
1026 | ||
9c936e3f LL |
1027 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
1028 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 1029 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
1030 | |
1031 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
1032 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
1033 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
1034 | |
1035 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 1036 | } |