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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac79cbb9 | 2 | /* Copyright (C) 2014-2017 B.A.T.M.A.N. contributors: |
c5caf4ef LL |
3 | * |
4 | * Linus Lüssing | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
c5caf4ef | 19 | #include "multicast.h" |
1e2c2a4f SE |
20 | #include "main.h" |
21 | ||
22 | #include <linux/atomic.h> | |
9c936e3f | 23 | #include <linux/bitops.h> |
8a4023c5 | 24 | #include <linux/bug.h> |
1e2c2a4f SE |
25 | #include <linux/byteorder/generic.h> |
26 | #include <linux/errno.h> | |
27 | #include <linux/etherdevice.h> | |
b92b94ac | 28 | #include <linux/gfp.h> |
bd2a979e | 29 | #include <linux/icmpv6.h> |
687937ab | 30 | #include <linux/if_bridge.h> |
1e2c2a4f | 31 | #include <linux/if_ether.h> |
bd2a979e | 32 | #include <linux/igmp.h> |
1e2c2a4f | 33 | #include <linux/in.h> |
bd2a979e | 34 | #include <linux/in6.h> |
1e2c2a4f SE |
35 | #include <linux/ip.h> |
36 | #include <linux/ipv6.h> | |
cbebd363 | 37 | #include <linux/jiffies.h> |
72f7b2de | 38 | #include <linux/kernel.h> |
7c124391 | 39 | #include <linux/kref.h> |
1e2c2a4f | 40 | #include <linux/list.h> |
2c72d655 | 41 | #include <linux/lockdep.h> |
1e2c2a4f | 42 | #include <linux/netdevice.h> |
687937ab | 43 | #include <linux/printk.h> |
1e2c2a4f SE |
44 | #include <linux/rculist.h> |
45 | #include <linux/rcupdate.h> | |
4e3e823b | 46 | #include <linux/seq_file.h> |
1e2c2a4f SE |
47 | #include <linux/skbuff.h> |
48 | #include <linux/slab.h> | |
49 | #include <linux/spinlock.h> | |
50 | #include <linux/stddef.h> | |
51 | #include <linux/string.h> | |
52 | #include <linux/types.h> | |
cbebd363 | 53 | #include <linux/workqueue.h> |
1e2c2a4f | 54 | #include <net/addrconf.h> |
687937ab LL |
55 | #include <net/if_inet6.h> |
56 | #include <net/ip.h> | |
1e2c2a4f SE |
57 | #include <net/ipv6.h> |
58 | ||
4e3e823b LL |
59 | #include "hard-interface.h" |
60 | #include "hash.h" | |
ba412080 | 61 | #include "log.h" |
1e2c2a4f | 62 | #include "packet.h" |
c5caf4ef | 63 | #include "translation-table.h" |
1f8dce49 | 64 | #include "tvlv.h" |
c5caf4ef | 65 | |
cbebd363 LL |
66 | static void batadv_mcast_mla_update(struct work_struct *work); |
67 | ||
68 | /** | |
69 | * batadv_mcast_start_timer - schedule the multicast periodic worker | |
70 | * @bat_priv: the bat priv with all the soft interface information | |
71 | */ | |
72 | static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) | |
73 | { | |
74 | queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, | |
75 | msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); | |
76 | } | |
77 | ||
687937ab LL |
78 | /** |
79 | * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists | |
80 | * @soft_iface: netdev struct of the mesh interface | |
81 | * | |
82 | * If the given soft interface has a bridge on top then the refcount | |
83 | * of the according net device is increased. | |
84 | * | |
85 | * Return: NULL if no such bridge exists. Otherwise the net device of the | |
86 | * bridge. | |
87 | */ | |
88 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) | |
89 | { | |
90 | struct net_device *upper = soft_iface; | |
91 | ||
92 | rcu_read_lock(); | |
93 | do { | |
94 | upper = netdev_master_upper_dev_get_rcu(upper); | |
95 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
96 | ||
97 | if (upper) | |
98 | dev_hold(upper); | |
99 | rcu_read_unlock(); | |
100 | ||
101 | return upper; | |
102 | } | |
103 | ||
c5caf4ef LL |
104 | /** |
105 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
106 | * @dev: the device to collect multicast addresses from | |
107 | * @mcast_list: a list to put found addresses into | |
108 | * | |
687937ab LL |
109 | * Collects multicast addresses of multicast listeners residing |
110 | * on this kernel on the given soft interface, dev, in | |
111 | * the given mcast_list. In general, multicast listeners provided by | |
112 | * your multicast receiving applications run directly on this node. | |
113 | * | |
114 | * If there is a bridge interface on top of dev, collects from that one | |
115 | * instead. Just like with IP addresses and routes, multicast listeners | |
116 | * will(/should) register to the bridge interface instead of an | |
117 | * enslaved bat0. | |
c5caf4ef | 118 | * |
62fe710f | 119 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
120 | * items added to the mcast_list otherwise. |
121 | */ | |
122 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
123 | struct hlist_head *mcast_list) | |
124 | { | |
687937ab | 125 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
c5caf4ef LL |
126 | struct netdev_hw_addr *mc_list_entry; |
127 | struct batadv_hw_addr *new; | |
128 | int ret = 0; | |
129 | ||
687937ab LL |
130 | netif_addr_lock_bh(bridge ? bridge : dev); |
131 | netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { | |
c5caf4ef LL |
132 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
133 | if (!new) { | |
134 | ret = -ENOMEM; | |
135 | break; | |
136 | } | |
137 | ||
138 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
139 | hlist_add_head(&new->list, mcast_list); | |
140 | ret++; | |
141 | } | |
687937ab LL |
142 | netif_addr_unlock_bh(bridge ? bridge : dev); |
143 | ||
144 | if (bridge) | |
145 | dev_put(bridge); | |
c5caf4ef LL |
146 | |
147 | return ret; | |
148 | } | |
149 | ||
150 | /** | |
151 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
152 | * @mcast_addr: the multicast address to check | |
153 | * @mcast_list: the list with multicast addresses to search in | |
154 | * | |
62fe710f | 155 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
156 | * Otherwise returns false. |
157 | */ | |
6b5e971a | 158 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
159 | struct hlist_head *mcast_list) |
160 | { | |
161 | struct batadv_hw_addr *mcast_entry; | |
162 | ||
163 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
164 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
165 | return true; | |
166 | ||
167 | return false; | |
168 | } | |
169 | ||
687937ab LL |
170 | /** |
171 | * batadv_mcast_mla_br_addr_cpy - copy a bridge multicast address | |
172 | * @dst: destination to write to - a multicast MAC address | |
173 | * @src: source to read from - a multicast IP address | |
174 | * | |
175 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
176 | * to its matching multicast MAC address and copies it into the given | |
177 | * destination buffer. | |
178 | * | |
179 | * Caller needs to make sure the destination buffer can hold | |
180 | * at least ETH_ALEN bytes. | |
181 | */ | |
182 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
183 | { | |
184 | if (src->proto == htons(ETH_P_IP)) | |
185 | ip_eth_mc_map(src->u.ip4, dst); | |
186 | #if IS_ENABLED(CONFIG_IPV6) | |
187 | else if (src->proto == htons(ETH_P_IPV6)) | |
188 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
189 | #endif | |
190 | else | |
191 | eth_zero_addr(dst); | |
192 | } | |
193 | ||
194 | /** | |
195 | * batadv_mcast_mla_bridge_get - get bridged-in multicast listeners | |
196 | * @dev: a bridge slave whose bridge to collect multicast addresses from | |
197 | * @mcast_list: a list to put found addresses into | |
198 | * | |
199 | * Collects multicast addresses of multicast listeners residing | |
200 | * on foreign, non-mesh devices which we gave access to our mesh via | |
201 | * a bridge on top of the given soft interface, dev, in the given | |
202 | * mcast_list. | |
203 | * | |
204 | * Return: -ENOMEM on memory allocation error or the number of | |
205 | * items added to the mcast_list otherwise. | |
206 | */ | |
207 | static int batadv_mcast_mla_bridge_get(struct net_device *dev, | |
208 | struct hlist_head *mcast_list) | |
209 | { | |
210 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
211 | struct br_ip_list *br_ip_entry, *tmp; | |
212 | struct batadv_hw_addr *new; | |
213 | u8 mcast_addr[ETH_ALEN]; | |
214 | int ret; | |
215 | ||
216 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
217 | * snooping code of the Linux bridge already does that for us | |
218 | */ | |
219 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
220 | if (ret < 0) | |
221 | goto out; | |
222 | ||
223 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
224 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); | |
225 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
226 | continue; | |
227 | ||
228 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
229 | if (!new) { | |
230 | ret = -ENOMEM; | |
231 | break; | |
232 | } | |
233 | ||
234 | ether_addr_copy(new->addr, mcast_addr); | |
235 | hlist_add_head(&new->list, mcast_list); | |
236 | } | |
237 | ||
238 | out: | |
239 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
240 | list_del(&br_ip_entry->list); | |
241 | kfree(br_ip_entry); | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
c5caf4ef LL |
247 | /** |
248 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
249 | * @mcast_list: the list to free | |
250 | * | |
251 | * Removes and frees all items in the given mcast_list. | |
252 | */ | |
b7769763 | 253 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) |
c5caf4ef LL |
254 | { |
255 | struct batadv_hw_addr *mcast_entry; | |
256 | struct hlist_node *tmp; | |
257 | ||
258 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
259 | hlist_del(&mcast_entry->list); | |
260 | kfree(mcast_entry); | |
261 | } | |
262 | } | |
263 | ||
264 | /** | |
265 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
266 | * @bat_priv: the bat priv with all the soft interface information | |
267 | * @mcast_list: a list of addresses which should _not_ be removed | |
268 | * | |
269 | * Retracts the announcement of any multicast listener from the | |
270 | * translation table except the ones listed in the given mcast_list. | |
271 | * | |
272 | * If mcast_list is NULL then all are retracted. | |
cbebd363 LL |
273 | * |
274 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
275 | */ |
276 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
277 | struct hlist_head *mcast_list) | |
278 | { | |
279 | struct batadv_hw_addr *mcast_entry; | |
280 | struct hlist_node *tmp; | |
281 | ||
cbebd363 | 282 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 283 | |
c5caf4ef LL |
284 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
285 | list) { | |
286 | if (mcast_list && | |
287 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
288 | mcast_list)) | |
289 | continue; | |
290 | ||
291 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
292 | BATADV_NO_FLAGS, | |
293 | "mcast TT outdated", false); | |
294 | ||
295 | hlist_del(&mcast_entry->list); | |
296 | kfree(mcast_entry); | |
297 | } | |
298 | } | |
299 | ||
300 | /** | |
301 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
302 | * @bat_priv: the bat priv with all the soft interface information | |
303 | * @mcast_list: a list of addresses which are going to get added | |
304 | * | |
305 | * Adds multicast listener announcements from the given mcast_list to the | |
306 | * translation table if they have not been added yet. | |
cbebd363 LL |
307 | * |
308 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
309 | */ |
310 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
311 | struct hlist_head *mcast_list) | |
312 | { | |
313 | struct batadv_hw_addr *mcast_entry; | |
314 | struct hlist_node *tmp; | |
315 | ||
cbebd363 | 316 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 317 | |
c5caf4ef LL |
318 | if (!mcast_list) |
319 | return; | |
320 | ||
321 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
322 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
323 | &bat_priv->mcast.mla_list)) | |
324 | continue; | |
325 | ||
326 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
327 | mcast_entry->addr, BATADV_NO_FLAGS, | |
328 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
329 | continue; | |
330 | ||
331 | hlist_del(&mcast_entry->list); | |
332 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
333 | } | |
334 | } | |
335 | ||
336 | /** | |
337 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
338 | * @bat_priv: the bat priv with all the soft interface information | |
339 | * | |
62fe710f SE |
340 | * Checks whether there is a bridge on top of our soft interface. |
341 | * | |
342 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
343 | */ |
344 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
345 | { | |
346 | struct net_device *upper = bat_priv->soft_iface; | |
347 | ||
348 | rcu_read_lock(); | |
349 | do { | |
350 | upper = netdev_master_upper_dev_get_rcu(upper); | |
351 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
352 | rcu_read_unlock(); | |
353 | ||
354 | return upper; | |
355 | } | |
356 | ||
72f7b2de LL |
357 | /** |
358 | * batadv_mcast_querier_log - debug output regarding the querier status on link | |
359 | * @bat_priv: the bat priv with all the soft interface information | |
360 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") | |
361 | * @old_state: the previous querier state on our link | |
362 | * @new_state: the new querier state on our link | |
363 | * | |
364 | * Outputs debug messages to the logging facility with log level 'mcast' | |
365 | * regarding changes to the querier status on the link which are relevant | |
366 | * to our multicast optimizations. | |
367 | * | |
368 | * Usually this is about whether a querier appeared or vanished in | |
369 | * our mesh or whether the querier is in the suboptimal position of being | |
370 | * behind our local bridge segment: Snooping switches will directly | |
371 | * forward listener reports to the querier, therefore batman-adv and | |
372 | * the bridge will potentially not see these listeners - the querier is | |
373 | * potentially shadowing listeners from us then. | |
374 | * | |
375 | * This is only interesting for nodes with a bridge on top of their | |
376 | * soft interface. | |
377 | */ | |
378 | static void | |
379 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, | |
380 | struct batadv_mcast_querier_state *old_state, | |
381 | struct batadv_mcast_querier_state *new_state) | |
382 | { | |
383 | if (!old_state->exists && new_state->exists) | |
384 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", | |
385 | str_proto); | |
386 | else if (old_state->exists && !new_state->exists) | |
387 | batadv_info(bat_priv->soft_iface, | |
388 | "%s Querier disappeared - multicast optimizations disabled\n", | |
389 | str_proto); | |
390 | else if (!bat_priv->mcast.bridged && !new_state->exists) | |
391 | batadv_info(bat_priv->soft_iface, | |
392 | "No %s Querier present - multicast optimizations disabled\n", | |
393 | str_proto); | |
394 | ||
395 | if (new_state->exists) { | |
396 | if ((!old_state->shadowing && new_state->shadowing) || | |
397 | (!old_state->exists && new_state->shadowing)) | |
398 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
399 | "%s Querier is behind our bridged segment: Might shadow listeners\n", | |
400 | str_proto); | |
401 | else if (old_state->shadowing && !new_state->shadowing) | |
402 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
403 | "%s Querier is not behind our bridged segment\n", | |
404 | str_proto); | |
405 | } | |
406 | } | |
407 | ||
408 | /** | |
409 | * batadv_mcast_bridge_log - debug output for topology changes in bridged setups | |
410 | * @bat_priv: the bat priv with all the soft interface information | |
411 | * @bridged: a flag about whether the soft interface is currently bridged or not | |
412 | * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier | |
413 | * @querier_ipv6: (maybe) new status of a potential, selected MLD querier | |
414 | * | |
415 | * If no bridges are ever used on this node, then this function does nothing. | |
416 | * | |
417 | * Otherwise this function outputs debug information to the 'mcast' log level | |
418 | * which might be relevant to our multicast optimizations. | |
419 | * | |
420 | * More precisely, it outputs information when a bridge interface is added or | |
421 | * removed from a soft interface. And when a bridge is present, it further | |
422 | * outputs information about the querier state which is relevant for the | |
423 | * multicast flags this node is going to set. | |
424 | */ | |
425 | static void | |
426 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged, | |
427 | struct batadv_mcast_querier_state *querier_ipv4, | |
428 | struct batadv_mcast_querier_state *querier_ipv6) | |
429 | { | |
430 | if (!bat_priv->mcast.bridged && bridged) | |
431 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
432 | "Bridge added: Setting Unsnoopables(U)-flag\n"); | |
433 | else if (bat_priv->mcast.bridged && !bridged) | |
434 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
435 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); | |
436 | ||
437 | if (bridged) { | |
438 | batadv_mcast_querier_log(bat_priv, "IGMP", | |
439 | &bat_priv->mcast.querier_ipv4, | |
440 | querier_ipv4); | |
441 | batadv_mcast_querier_log(bat_priv, "MLD", | |
442 | &bat_priv->mcast.querier_ipv6, | |
443 | querier_ipv6); | |
444 | } | |
445 | } | |
446 | ||
447 | /** | |
448 | * batadv_mcast_flags_logs - output debug information about mcast flag changes | |
449 | * @bat_priv: the bat priv with all the soft interface information | |
450 | * @flags: flags indicating the new multicast state | |
451 | * | |
452 | * Whenever the multicast flags this nodes announces changes (@mcast_flags vs. | |
453 | * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level. | |
454 | */ | |
455 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) | |
456 | { | |
457 | u8 old_flags = bat_priv->mcast.flags; | |
458 | char str_old_flags[] = "[...]"; | |
459 | ||
460 | sprintf(str_old_flags, "[%c%c%c]", | |
461 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
462 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
463 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
464 | ||
465 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
466 | "Changing multicast flags from '%s' to '[%c%c%c]'\n", | |
467 | bat_priv->mcast.enabled ? str_old_flags : "<undefined>", | |
468 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
469 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
470 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
471 | } | |
472 | ||
60432d75 LL |
473 | /** |
474 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
475 | * @bat_priv: the bat priv with all the soft interface information | |
476 | * | |
477 | * Updates the own multicast tvlv with our current multicast related settings, | |
478 | * capabilities and inabilities. | |
479 | * | |
687937ab LL |
480 | * Return: false if we want all IPv4 && IPv6 multicast traffic and true |
481 | * otherwise. | |
60432d75 LL |
482 | */ |
483 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
484 | { | |
485 | struct batadv_tvlv_mcast_data mcast_data; | |
687937ab LL |
486 | struct batadv_mcast_querier_state querier4 = {false, false}; |
487 | struct batadv_mcast_querier_state querier6 = {false, false}; | |
488 | struct net_device *dev = bat_priv->soft_iface; | |
72f7b2de | 489 | bool bridged; |
60432d75 LL |
490 | |
491 | mcast_data.flags = BATADV_NO_FLAGS; | |
492 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
493 | ||
72f7b2de LL |
494 | bridged = batadv_mcast_has_bridge(bat_priv); |
495 | if (!bridged) | |
687937ab LL |
496 | goto update; |
497 | ||
c1bacea0 SE |
498 | if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) |
499 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
687937ab LL |
500 | |
501 | querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
502 | querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
503 | ||
504 | querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
505 | querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
506 | ||
507 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
508 | ||
509 | /* 1) If no querier exists at all, then multicast listeners on | |
510 | * our local TT clients behind the bridge will keep silent. | |
511 | * 2) If the selected querier is on one of our local TT clients, | |
512 | * behind the bridge, then this querier might shadow multicast | |
513 | * listeners on our local TT clients, behind this bridge. | |
514 | * | |
515 | * In both cases, we will signalize other batman nodes that | |
516 | * we need all multicast traffic of the according protocol. | |
60432d75 | 517 | */ |
687937ab LL |
518 | if (!querier4.exists || querier4.shadowing) |
519 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
60432d75 | 520 | |
687937ab LL |
521 | if (!querier6.exists || querier6.shadowing) |
522 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
60432d75 | 523 | |
687937ab | 524 | update: |
72f7b2de LL |
525 | batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6); |
526 | ||
527 | bat_priv->mcast.querier_ipv4.exists = querier4.exists; | |
528 | bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing; | |
529 | ||
530 | bat_priv->mcast.querier_ipv6.exists = querier6.exists; | |
531 | bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing; | |
532 | ||
533 | bat_priv->mcast.bridged = bridged; | |
534 | ||
60432d75 LL |
535 | if (!bat_priv->mcast.enabled || |
536 | mcast_data.flags != bat_priv->mcast.flags) { | |
72f7b2de | 537 | batadv_mcast_flags_log(bat_priv, mcast_data.flags); |
bd2a979e | 538 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
60432d75 LL |
539 | &mcast_data, sizeof(mcast_data)); |
540 | bat_priv->mcast.flags = mcast_data.flags; | |
541 | bat_priv->mcast.enabled = true; | |
542 | } | |
543 | ||
687937ab | 544 | return !(mcast_data.flags & |
4d7de48c | 545 | (BATADV_MCAST_WANT_ALL_IPV4 | BATADV_MCAST_WANT_ALL_IPV6)); |
60432d75 LL |
546 | } |
547 | ||
c5caf4ef | 548 | /** |
cbebd363 | 549 | * __batadv_mcast_mla_update - update the own MLAs |
c5caf4ef LL |
550 | * @bat_priv: the bat priv with all the soft interface information |
551 | * | |
60432d75 LL |
552 | * Updates the own multicast listener announcements in the translation |
553 | * table as well as the own, announced multicast tvlv container. | |
cbebd363 LL |
554 | * |
555 | * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list | |
556 | * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are | |
557 | * ensured by the non-parallel execution of the worker this function | |
558 | * belongs to. | |
c5caf4ef | 559 | */ |
cbebd363 | 560 | static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) |
c5caf4ef LL |
561 | { |
562 | struct net_device *soft_iface = bat_priv->soft_iface; | |
563 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
564 | int ret; | |
565 | ||
60432d75 | 566 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
567 | goto update; |
568 | ||
569 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
570 | if (ret < 0) | |
571 | goto out; | |
572 | ||
687937ab LL |
573 | ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); |
574 | if (ret < 0) | |
575 | goto out; | |
576 | ||
c5caf4ef LL |
577 | update: |
578 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
579 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
580 | ||
581 | out: | |
b7769763 | 582 | batadv_mcast_mla_list_free(&mcast_list); |
c5caf4ef LL |
583 | } |
584 | ||
cbebd363 LL |
585 | /** |
586 | * batadv_mcast_mla_update - update the own MLAs | |
587 | * @work: kernel work struct | |
588 | * | |
589 | * Updates the own multicast listener announcements in the translation | |
590 | * table as well as the own, announced multicast tvlv container. | |
591 | * | |
592 | * In the end, reschedules the work timer. | |
593 | */ | |
594 | static void batadv_mcast_mla_update(struct work_struct *work) | |
595 | { | |
596 | struct delayed_work *delayed_work; | |
597 | struct batadv_priv_mcast *priv_mcast; | |
598 | struct batadv_priv *bat_priv; | |
599 | ||
600 | delayed_work = to_delayed_work(work); | |
601 | priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); | |
602 | bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); | |
603 | ||
604 | __batadv_mcast_mla_update(bat_priv); | |
605 | batadv_mcast_start_timer(bat_priv); | |
606 | } | |
607 | ||
bd2a979e LL |
608 | /** |
609 | * batadv_mcast_is_report_ipv4 - check for IGMP reports | |
610 | * @skb: the ethernet frame destined for the mesh | |
611 | * | |
612 | * This call might reallocate skb data. | |
613 | * | |
614 | * Checks whether the given frame is a valid IGMP report. | |
615 | * | |
616 | * Return: If so then true, otherwise false. | |
617 | */ | |
618 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
619 | { | |
620 | if (ip_mc_check_igmp(skb, NULL) < 0) | |
621 | return false; | |
622 | ||
623 | switch (igmp_hdr(skb)->type) { | |
624 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
625 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
626 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
627 | return true; | |
628 | } | |
629 | ||
630 | return false; | |
631 | } | |
632 | ||
ab49886e LL |
633 | /** |
634 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
635 | * @bat_priv: the bat priv with all the soft interface information | |
636 | * @skb: the IPv4 packet to check | |
637 | * @is_unsnoopable: stores whether the destination is snoopable | |
638 | * | |
639 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
640 | * mode more optimal than classic flooding. | |
641 | * | |
62fe710f SE |
642 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
643 | * allocation failure. | |
ab49886e LL |
644 | */ |
645 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
646 | struct sk_buff *skb, | |
647 | bool *is_unsnoopable) | |
648 | { | |
649 | struct iphdr *iphdr; | |
650 | ||
651 | /* We might fail due to out-of-memory -> drop it */ | |
652 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
653 | return -ENOMEM; | |
654 | ||
bd2a979e LL |
655 | if (batadv_mcast_is_report_ipv4(skb)) |
656 | return -EINVAL; | |
657 | ||
ab49886e LL |
658 | iphdr = ip_hdr(skb); |
659 | ||
660 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
661 | * then allow scope > link local, too | |
662 | */ | |
663 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
664 | return -EINVAL; | |
665 | ||
666 | /* link-local multicast listeners behind a bridge are | |
667 | * not snoopable (see RFC4541, section 2.1.2.2) | |
668 | */ | |
669 | *is_unsnoopable = true; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
bd2a979e LL |
674 | /** |
675 | * batadv_mcast_is_report_ipv6 - check for MLD reports | |
676 | * @skb: the ethernet frame destined for the mesh | |
677 | * | |
678 | * This call might reallocate skb data. | |
679 | * | |
680 | * Checks whether the given frame is a valid MLD report. | |
681 | * | |
682 | * Return: If so then true, otherwise false. | |
683 | */ | |
684 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
685 | { | |
686 | if (ipv6_mc_check_mld(skb, NULL) < 0) | |
687 | return false; | |
688 | ||
689 | switch (icmp6_hdr(skb)->icmp6_type) { | |
690 | case ICMPV6_MGM_REPORT: | |
691 | case ICMPV6_MLD2_REPORT: | |
692 | return true; | |
693 | } | |
694 | ||
695 | return false; | |
696 | } | |
697 | ||
1d8ab8d3 LL |
698 | /** |
699 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
700 | * @bat_priv: the bat priv with all the soft interface information | |
701 | * @skb: the IPv6 packet to check | |
ab49886e | 702 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
703 | * |
704 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
705 | * mode more optimal than classic flooding. | |
706 | * | |
62fe710f | 707 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
708 | */ |
709 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
710 | struct sk_buff *skb, |
711 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
712 | { |
713 | struct ipv6hdr *ip6hdr; | |
714 | ||
715 | /* We might fail due to out-of-memory -> drop it */ | |
716 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
717 | return -ENOMEM; | |
718 | ||
bd2a979e LL |
719 | if (batadv_mcast_is_report_ipv6(skb)) |
720 | return -EINVAL; | |
721 | ||
1d8ab8d3 LL |
722 | ip6hdr = ipv6_hdr(skb); |
723 | ||
724 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
725 | * then allow scope > link local, too | |
726 | */ | |
727 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
728 | return -EINVAL; | |
729 | ||
730 | /* link-local-all-nodes multicast listeners behind a bridge are | |
731 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
732 | */ | |
733 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 734 | *is_unsnoopable = true; |
1d8ab8d3 LL |
735 | |
736 | return 0; | |
737 | } | |
738 | ||
739 | /** | |
740 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
741 | * @bat_priv: the bat priv with all the soft interface information | |
742 | * @skb: the multicast frame to check | |
ab49886e | 743 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
744 | * |
745 | * Checks whether the given multicast ethernet frame has the potential to be | |
746 | * forwarded with a mode more optimal than classic flooding. | |
747 | * | |
62fe710f | 748 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
749 | */ |
750 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
751 | struct sk_buff *skb, |
752 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
753 | { |
754 | struct ethhdr *ethhdr = eth_hdr(skb); | |
755 | ||
756 | if (!atomic_read(&bat_priv->multicast_mode)) | |
757 | return -EINVAL; | |
758 | ||
759 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
760 | return -EINVAL; | |
761 | ||
762 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
763 | case ETH_P_IP: |
764 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
765 | is_unsnoopable); | |
1d8ab8d3 | 766 | case ETH_P_IPV6: |
c1bacea0 SE |
767 | if (!IS_ENABLED(CONFIG_IPV6)) |
768 | return -EINVAL; | |
769 | ||
ab49886e LL |
770 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
771 | is_unsnoopable); | |
1d8ab8d3 LL |
772 | default: |
773 | return -EINVAL; | |
774 | } | |
775 | } | |
776 | ||
4c8755d6 | 777 | /** |
6d030de8 AQ |
778 | * batadv_mcast_forw_want_all_ip_count - count nodes with unspecific mcast |
779 | * interest | |
4c8755d6 LL |
780 | * @bat_priv: the bat priv with all the soft interface information |
781 | * @ethhdr: ethernet header of a packet | |
782 | * | |
62fe710f | 783 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
784 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
785 | * IPv6 traffic if it matches an IPv6 packet. | |
786 | */ | |
787 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
788 | struct ethhdr *ethhdr) | |
789 | { | |
790 | switch (ntohs(ethhdr->h_proto)) { | |
791 | case ETH_P_IP: | |
792 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
793 | case ETH_P_IPV6: | |
794 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
795 | default: | |
796 | /* we shouldn't be here... */ | |
797 | return 0; | |
798 | } | |
799 | } | |
800 | ||
1d8ab8d3 LL |
801 | /** |
802 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
803 | * @bat_priv: the bat priv with all the soft interface information | |
804 | * @ethhdr: the ether header containing the multicast destination | |
805 | * | |
62fe710f | 806 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
807 | * via a translation table lookup. This increases the returned nodes refcount. |
808 | */ | |
809 | static struct batadv_orig_node * | |
810 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
811 | struct ethhdr *ethhdr) | |
812 | { | |
813 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
814 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
815 | } | |
816 | ||
4c8755d6 | 817 | /** |
6d030de8 | 818 | * batadv_mcast_forw_ipv4_node_get - get a node with an ipv4 flag |
4c8755d6 LL |
819 | * @bat_priv: the bat priv with all the soft interface information |
820 | * | |
62fe710f | 821 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
822 | * increases its refcount. |
823 | */ | |
824 | static struct batadv_orig_node * | |
825 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
826 | { | |
827 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
828 | ||
829 | rcu_read_lock(); | |
830 | hlist_for_each_entry_rcu(tmp_orig_node, | |
831 | &bat_priv->mcast.want_all_ipv4_list, | |
832 | mcast_want_all_ipv4_node) { | |
7c124391 | 833 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
834 | continue; |
835 | ||
836 | orig_node = tmp_orig_node; | |
837 | break; | |
838 | } | |
839 | rcu_read_unlock(); | |
840 | ||
841 | return orig_node; | |
842 | } | |
843 | ||
844 | /** | |
6d030de8 | 845 | * batadv_mcast_forw_ipv6_node_get - get a node with an ipv6 flag |
4c8755d6 LL |
846 | * @bat_priv: the bat priv with all the soft interface information |
847 | * | |
62fe710f | 848 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
849 | * and increases its refcount. |
850 | */ | |
851 | static struct batadv_orig_node * | |
852 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
853 | { | |
854 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
855 | ||
856 | rcu_read_lock(); | |
857 | hlist_for_each_entry_rcu(tmp_orig_node, | |
858 | &bat_priv->mcast.want_all_ipv6_list, | |
859 | mcast_want_all_ipv6_node) { | |
7c124391 | 860 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
861 | continue; |
862 | ||
863 | orig_node = tmp_orig_node; | |
864 | break; | |
865 | } | |
866 | rcu_read_unlock(); | |
867 | ||
868 | return orig_node; | |
869 | } | |
870 | ||
871 | /** | |
6d030de8 | 872 | * batadv_mcast_forw_ip_node_get - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
873 | * @bat_priv: the bat priv with all the soft interface information |
874 | * @ethhdr: an ethernet header to determine the protocol family from | |
875 | * | |
62fe710f | 876 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
877 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
878 | * increases its refcount. | |
879 | */ | |
880 | static struct batadv_orig_node * | |
881 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
882 | struct ethhdr *ethhdr) | |
883 | { | |
884 | switch (ntohs(ethhdr->h_proto)) { | |
885 | case ETH_P_IP: | |
886 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
887 | case ETH_P_IPV6: | |
888 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
889 | default: | |
890 | /* we shouldn't be here... */ | |
891 | return NULL; | |
892 | } | |
893 | } | |
894 | ||
ab49886e | 895 | /** |
6d030de8 | 896 | * batadv_mcast_forw_unsnoop_node_get - get a node with an unsnoopable flag |
ab49886e LL |
897 | * @bat_priv: the bat priv with all the soft interface information |
898 | * | |
62fe710f | 899 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
900 | * set and increases its refcount. |
901 | */ | |
902 | static struct batadv_orig_node * | |
903 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
904 | { | |
905 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
906 | ||
907 | rcu_read_lock(); | |
908 | hlist_for_each_entry_rcu(tmp_orig_node, | |
909 | &bat_priv->mcast.want_all_unsnoopables_list, | |
910 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 911 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
912 | continue; |
913 | ||
914 | orig_node = tmp_orig_node; | |
915 | break; | |
916 | } | |
917 | rcu_read_unlock(); | |
918 | ||
919 | return orig_node; | |
920 | } | |
921 | ||
1d8ab8d3 LL |
922 | /** |
923 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
924 | * @bat_priv: the bat priv with all the soft interface information | |
925 | * @skb: The multicast packet to check | |
926 | * @orig: an originator to be set to forward the skb to | |
927 | * | |
62fe710f | 928 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
929 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
930 | * should be forwarded to. | |
931 | */ | |
932 | enum batadv_forw_mode | |
933 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
934 | struct batadv_orig_node **orig) | |
935 | { | |
4c8755d6 | 936 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 937 | bool is_unsnoopable = false; |
1d8ab8d3 | 938 | struct ethhdr *ethhdr; |
1d8ab8d3 | 939 | |
ab49886e | 940 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
941 | if (ret == -ENOMEM) |
942 | return BATADV_FORW_NONE; | |
943 | else if (ret < 0) | |
944 | return BATADV_FORW_ALL; | |
945 | ||
946 | ethhdr = eth_hdr(skb); | |
947 | ||
948 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
949 | BATADV_NO_FLAGS); | |
4c8755d6 | 950 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
951 | unsnoop_count = !is_unsnoopable ? 0 : |
952 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
953 | ||
4c8755d6 | 954 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 955 | |
ab49886e | 956 | switch (total_count) { |
1d8ab8d3 | 957 | case 1: |
ab49886e LL |
958 | if (tt_count) |
959 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
960 | else if (ip_count) |
961 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
962 | else if (unsnoop_count) |
963 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
964 | ||
1d8ab8d3 LL |
965 | if (*orig) |
966 | return BATADV_FORW_SINGLE; | |
967 | ||
968 | /* fall through */ | |
969 | case 0: | |
970 | return BATADV_FORW_NONE; | |
971 | default: | |
972 | return BATADV_FORW_ALL; | |
973 | } | |
974 | } | |
975 | ||
ab49886e LL |
976 | /** |
977 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
978 | * @bat_priv: the bat priv with all the soft interface information | |
979 | * @orig: the orig_node which multicast state might have changed of | |
980 | * @mcast_flags: flags indicating the new multicast state | |
981 | * | |
982 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
983 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
984 | * |
985 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
986 | */ |
987 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
988 | struct batadv_orig_node *orig, | |
6b5e971a | 989 | u8 mcast_flags) |
ab49886e | 990 | { |
8a4023c5 LL |
991 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
992 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
993 | ||
5274cd68 SE |
994 | lockdep_assert_held(&orig->mcast_handler_lock); |
995 | ||
ab49886e LL |
996 | /* switched from flag unset to set */ |
997 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
998 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
999 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
1000 | ||
1001 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1002 | /* flag checks above + mcast_handler_lock prevents this */ |
1003 | WARN_ON(!hlist_unhashed(node)); | |
1004 | ||
1005 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
1006 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1007 | /* switched from flag set to unset */ | |
1008 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
1009 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
1010 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
1011 | ||
1012 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1013 | /* flag checks above + mcast_handler_lock prevents this */ |
1014 | WARN_ON(hlist_unhashed(node)); | |
1015 | ||
1016 | hlist_del_init_rcu(node); | |
ab49886e LL |
1017 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1018 | } | |
1019 | } | |
1020 | ||
4c8755d6 LL |
1021 | /** |
1022 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
1023 | * @bat_priv: the bat priv with all the soft interface information | |
1024 | * @orig: the orig_node which multicast state might have changed of | |
1025 | * @mcast_flags: flags indicating the new multicast state | |
1026 | * | |
1027 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
1028 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1029 | * |
1030 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1031 | */ |
1032 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
1033 | struct batadv_orig_node *orig, | |
6b5e971a | 1034 | u8 mcast_flags) |
4c8755d6 | 1035 | { |
8a4023c5 LL |
1036 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
1037 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
1038 | ||
5274cd68 SE |
1039 | lockdep_assert_held(&orig->mcast_handler_lock); |
1040 | ||
4c8755d6 LL |
1041 | /* switched from flag unset to set */ |
1042 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
1043 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
1044 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
1045 | ||
1046 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1047 | /* flag checks above + mcast_handler_lock prevents this */ |
1048 | WARN_ON(!hlist_unhashed(node)); | |
1049 | ||
1050 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1051 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1052 | /* switched from flag set to unset */ | |
1053 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
1054 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
1055 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
1056 | ||
1057 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1058 | /* flag checks above + mcast_handler_lock prevents this */ |
1059 | WARN_ON(hlist_unhashed(node)); | |
1060 | ||
1061 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1062 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
1068 | * @bat_priv: the bat priv with all the soft interface information | |
1069 | * @orig: the orig_node which multicast state might have changed of | |
1070 | * @mcast_flags: flags indicating the new multicast state | |
1071 | * | |
1072 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
1073 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1074 | * |
1075 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1076 | */ |
1077 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
1078 | struct batadv_orig_node *orig, | |
6b5e971a | 1079 | u8 mcast_flags) |
4c8755d6 | 1080 | { |
8a4023c5 LL |
1081 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1082 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
1083 | ||
5274cd68 SE |
1084 | lockdep_assert_held(&orig->mcast_handler_lock); |
1085 | ||
4c8755d6 LL |
1086 | /* switched from flag unset to set */ |
1087 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
1088 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
1089 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
1090 | ||
1091 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1092 | /* flag checks above + mcast_handler_lock prevents this */ |
1093 | WARN_ON(!hlist_unhashed(node)); | |
1094 | ||
1095 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1096 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1097 | /* switched from flag set to unset */ | |
1098 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
1099 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
1100 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
1101 | ||
1102 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1103 | /* flag checks above + mcast_handler_lock prevents this */ |
1104 | WARN_ON(hlist_unhashed(node)); | |
1105 | ||
1106 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1107 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1108 | } | |
1109 | } | |
1110 | ||
60432d75 | 1111 | /** |
bd2a979e | 1112 | * batadv_mcast_tvlv_ogm_handler - process incoming multicast tvlv container |
60432d75 LL |
1113 | * @bat_priv: the bat priv with all the soft interface information |
1114 | * @orig: the orig_node of the ogm | |
1115 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
1116 | * @tvlv_value: tvlv buffer containing the multicast data | |
1117 | * @tvlv_value_len: tvlv buffer length | |
1118 | */ | |
bd2a979e LL |
1119 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
1120 | struct batadv_orig_node *orig, | |
1121 | u8 flags, | |
1122 | void *tvlv_value, | |
1123 | u16 tvlv_value_len) | |
60432d75 LL |
1124 | { |
1125 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 1126 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
1127 | bool orig_initialized; |
1128 | ||
8a4023c5 | 1129 | if (orig_mcast_enabled && tvlv_value && |
825ffe1f | 1130 | tvlv_value_len >= sizeof(mcast_flags)) |
6b5e971a | 1131 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
1132 | |
1133 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
1134 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
1135 | &orig->capa_initialized); | |
60432d75 LL |
1136 | |
1137 | /* If mcast support is turned on decrease the disabled mcast node | |
1138 | * counter only if we had increased it for this node before. If this | |
1139 | * is a completely new orig_node no need to decrease the counter. | |
1140 | */ | |
1141 | if (orig_mcast_enabled && | |
9c936e3f | 1142 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
1143 | if (orig_initialized) |
1144 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 1145 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
1146 | /* If mcast support is being switched off or if this is an initial |
1147 | * OGM without mcast support then increase the disabled mcast | |
1148 | * node counter. | |
60432d75 LL |
1149 | */ |
1150 | } else if (!orig_mcast_enabled && | |
9c936e3f | 1151 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 1152 | !orig_initialized)) { |
60432d75 | 1153 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 1154 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
1155 | } |
1156 | ||
9c936e3f | 1157 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 1158 | |
ab49886e | 1159 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
1160 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
1161 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 1162 | |
60432d75 | 1163 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 1164 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
1165 | } |
1166 | ||
1167 | /** | |
1168 | * batadv_mcast_init - initialize the multicast optimizations structures | |
1169 | * @bat_priv: the bat priv with all the soft interface information | |
1170 | */ | |
1171 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
1172 | { | |
bd2a979e LL |
1173 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
1174 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 | 1175 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
cbebd363 LL |
1176 | |
1177 | INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); | |
1178 | batadv_mcast_start_timer(bat_priv); | |
60432d75 LL |
1179 | } |
1180 | ||
dc1cbd14 | 1181 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
4e3e823b LL |
1182 | /** |
1183 | * batadv_mcast_flags_print_header - print own mcast flags to debugfs table | |
1184 | * @bat_priv: the bat priv with all the soft interface information | |
1185 | * @seq: debugfs table seq_file struct | |
1186 | * | |
1187 | * Prints our own multicast flags including a more specific reason why | |
1188 | * they are set, that is prints the bridge and querier state too, to | |
1189 | * the debugfs table specified via @seq. | |
1190 | */ | |
1191 | static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv, | |
1192 | struct seq_file *seq) | |
1193 | { | |
1194 | u8 flags = bat_priv->mcast.flags; | |
1195 | char querier4, querier6, shadowing4, shadowing6; | |
1196 | bool bridged = bat_priv->mcast.bridged; | |
1197 | ||
1198 | if (bridged) { | |
1199 | querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4'; | |
1200 | querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6'; | |
1201 | shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.'; | |
1202 | shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.'; | |
1203 | } else { | |
1204 | querier4 = '?'; | |
1205 | querier6 = '?'; | |
1206 | shadowing4 = '?'; | |
1207 | shadowing6 = '?'; | |
1208 | } | |
1209 | ||
1210 | seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n", | |
1211 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
1212 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
1213 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
1214 | seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.'); | |
1215 | seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n", | |
1216 | querier4, querier6); | |
1217 | seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n", | |
1218 | shadowing4, shadowing6); | |
1219 | seq_puts(seq, "-------------------------------------------\n"); | |
1220 | seq_printf(seq, " %-10s %s\n", "Originator", "Flags"); | |
1221 | } | |
1222 | ||
1223 | /** | |
1224 | * batadv_mcast_flags_seq_print_text - print the mcast flags of other nodes | |
1225 | * @seq: seq file to print on | |
1226 | * @offset: not used | |
1227 | * | |
1228 | * This prints a table of (primary) originators and their according | |
1229 | * multicast flags, including (in the header) our own. | |
1230 | * | |
1231 | * Return: always 0 | |
1232 | */ | |
1233 | int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset) | |
1234 | { | |
1235 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1236 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1237 | struct batadv_hard_iface *primary_if; | |
1238 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1239 | struct batadv_orig_node *orig_node; | |
1240 | struct hlist_head *head; | |
1241 | u8 flags; | |
1242 | u32 i; | |
1243 | ||
1244 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1245 | if (!primary_if) | |
1246 | return 0; | |
1247 | ||
1248 | batadv_mcast_flags_print_header(bat_priv, seq); | |
1249 | ||
1250 | for (i = 0; i < hash->size; i++) { | |
1251 | head = &hash->table[i]; | |
1252 | ||
1253 | rcu_read_lock(); | |
1254 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1255 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1256 | &orig_node->capa_initialized)) | |
1257 | continue; | |
1258 | ||
1259 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1260 | &orig_node->capabilities)) { | |
1261 | seq_printf(seq, "%pM -\n", orig_node->orig); | |
1262 | continue; | |
1263 | } | |
1264 | ||
1265 | flags = orig_node->mcast_flags; | |
1266 | ||
1267 | seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig, | |
1268 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) | |
1269 | ? 'U' : '.', | |
1270 | (flags & BATADV_MCAST_WANT_ALL_IPV4) | |
1271 | ? '4' : '.', | |
1272 | (flags & BATADV_MCAST_WANT_ALL_IPV6) | |
1273 | ? '6' : '.'); | |
1274 | } | |
1275 | rcu_read_unlock(); | |
1276 | } | |
1277 | ||
1278 | batadv_hardif_put(primary_if); | |
1279 | ||
1280 | return 0; | |
1281 | } | |
dc1cbd14 | 1282 | #endif |
4e3e823b | 1283 | |
c5caf4ef LL |
1284 | /** |
1285 | * batadv_mcast_free - free the multicast optimizations structures | |
1286 | * @bat_priv: the bat priv with all the soft interface information | |
1287 | */ | |
1288 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
1289 | { | |
cbebd363 LL |
1290 | cancel_delayed_work_sync(&bat_priv->mcast.work); |
1291 | ||
bd2a979e LL |
1292 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
1293 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 1294 | |
cbebd363 | 1295 | /* safely calling outside of worker, as worker was canceled above */ |
c5caf4ef LL |
1296 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
1297 | } | |
60432d75 LL |
1298 | |
1299 | /** | |
1300 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
1301 | * @orig: the originator which is going to get purged | |
1302 | */ | |
1303 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
1304 | { | |
1305 | struct batadv_priv *bat_priv = orig->bat_priv; | |
1306 | ||
8a4023c5 LL |
1307 | spin_lock_bh(&orig->mcast_handler_lock); |
1308 | ||
9c936e3f LL |
1309 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
1310 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 1311 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
1312 | |
1313 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
1314 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
1315 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
1316 | |
1317 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 1318 | } |