]>
Commit | Line | Data |
---|---|---|
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> | |
72f7b2de | 36 | #include <linux/kernel.h> |
7c124391 | 37 | #include <linux/kref.h> |
1e2c2a4f | 38 | #include <linux/list.h> |
2c72d655 | 39 | #include <linux/lockdep.h> |
1e2c2a4f | 40 | #include <linux/netdevice.h> |
687937ab | 41 | #include <linux/printk.h> |
1e2c2a4f SE |
42 | #include <linux/rculist.h> |
43 | #include <linux/rcupdate.h> | |
4e3e823b | 44 | #include <linux/seq_file.h> |
1e2c2a4f SE |
45 | #include <linux/skbuff.h> |
46 | #include <linux/slab.h> | |
47 | #include <linux/spinlock.h> | |
48 | #include <linux/stddef.h> | |
49 | #include <linux/string.h> | |
50 | #include <linux/types.h> | |
51 | #include <net/addrconf.h> | |
687937ab LL |
52 | #include <net/if_inet6.h> |
53 | #include <net/ip.h> | |
1e2c2a4f SE |
54 | #include <net/ipv6.h> |
55 | ||
4e3e823b LL |
56 | #include "hard-interface.h" |
57 | #include "hash.h" | |
1e2c2a4f | 58 | #include "packet.h" |
c5caf4ef LL |
59 | #include "translation-table.h" |
60 | ||
687937ab LL |
61 | /** |
62 | * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists | |
63 | * @soft_iface: netdev struct of the mesh interface | |
64 | * | |
65 | * If the given soft interface has a bridge on top then the refcount | |
66 | * of the according net device is increased. | |
67 | * | |
68 | * Return: NULL if no such bridge exists. Otherwise the net device of the | |
69 | * bridge. | |
70 | */ | |
71 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) | |
72 | { | |
73 | struct net_device *upper = soft_iface; | |
74 | ||
75 | rcu_read_lock(); | |
76 | do { | |
77 | upper = netdev_master_upper_dev_get_rcu(upper); | |
78 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
79 | ||
80 | if (upper) | |
81 | dev_hold(upper); | |
82 | rcu_read_unlock(); | |
83 | ||
84 | return upper; | |
85 | } | |
86 | ||
c5caf4ef LL |
87 | /** |
88 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
89 | * @dev: the device to collect multicast addresses from | |
90 | * @mcast_list: a list to put found addresses into | |
91 | * | |
687937ab LL |
92 | * Collects multicast addresses of multicast listeners residing |
93 | * on this kernel on the given soft interface, dev, in | |
94 | * the given mcast_list. In general, multicast listeners provided by | |
95 | * your multicast receiving applications run directly on this node. | |
96 | * | |
97 | * If there is a bridge interface on top of dev, collects from that one | |
98 | * instead. Just like with IP addresses and routes, multicast listeners | |
99 | * will(/should) register to the bridge interface instead of an | |
100 | * enslaved bat0. | |
c5caf4ef | 101 | * |
62fe710f | 102 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
103 | * items added to the mcast_list otherwise. |
104 | */ | |
105 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
106 | struct hlist_head *mcast_list) | |
107 | { | |
687937ab | 108 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
c5caf4ef LL |
109 | struct netdev_hw_addr *mc_list_entry; |
110 | struct batadv_hw_addr *new; | |
111 | int ret = 0; | |
112 | ||
687937ab LL |
113 | netif_addr_lock_bh(bridge ? bridge : dev); |
114 | netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { | |
c5caf4ef LL |
115 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
116 | if (!new) { | |
117 | ret = -ENOMEM; | |
118 | break; | |
119 | } | |
120 | ||
121 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
122 | hlist_add_head(&new->list, mcast_list); | |
123 | ret++; | |
124 | } | |
687937ab LL |
125 | netif_addr_unlock_bh(bridge ? bridge : dev); |
126 | ||
127 | if (bridge) | |
128 | dev_put(bridge); | |
c5caf4ef LL |
129 | |
130 | return ret; | |
131 | } | |
132 | ||
133 | /** | |
134 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
135 | * @mcast_addr: the multicast address to check | |
136 | * @mcast_list: the list with multicast addresses to search in | |
137 | * | |
62fe710f | 138 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
139 | * Otherwise returns false. |
140 | */ | |
6b5e971a | 141 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
142 | struct hlist_head *mcast_list) |
143 | { | |
144 | struct batadv_hw_addr *mcast_entry; | |
145 | ||
146 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
147 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
148 | return true; | |
149 | ||
150 | return false; | |
151 | } | |
152 | ||
687937ab LL |
153 | /** |
154 | * batadv_mcast_mla_br_addr_cpy - copy a bridge multicast address | |
155 | * @dst: destination to write to - a multicast MAC address | |
156 | * @src: source to read from - a multicast IP address | |
157 | * | |
158 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
159 | * to its matching multicast MAC address and copies it into the given | |
160 | * destination buffer. | |
161 | * | |
162 | * Caller needs to make sure the destination buffer can hold | |
163 | * at least ETH_ALEN bytes. | |
164 | */ | |
165 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
166 | { | |
167 | if (src->proto == htons(ETH_P_IP)) | |
168 | ip_eth_mc_map(src->u.ip4, dst); | |
169 | #if IS_ENABLED(CONFIG_IPV6) | |
170 | else if (src->proto == htons(ETH_P_IPV6)) | |
171 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
172 | #endif | |
173 | else | |
174 | eth_zero_addr(dst); | |
175 | } | |
176 | ||
177 | /** | |
178 | * batadv_mcast_mla_bridge_get - get bridged-in multicast listeners | |
179 | * @dev: a bridge slave whose bridge to collect multicast addresses from | |
180 | * @mcast_list: a list to put found addresses into | |
181 | * | |
182 | * Collects multicast addresses of multicast listeners residing | |
183 | * on foreign, non-mesh devices which we gave access to our mesh via | |
184 | * a bridge on top of the given soft interface, dev, in the given | |
185 | * mcast_list. | |
186 | * | |
187 | * Return: -ENOMEM on memory allocation error or the number of | |
188 | * items added to the mcast_list otherwise. | |
189 | */ | |
190 | static int batadv_mcast_mla_bridge_get(struct net_device *dev, | |
191 | struct hlist_head *mcast_list) | |
192 | { | |
193 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
194 | struct br_ip_list *br_ip_entry, *tmp; | |
195 | struct batadv_hw_addr *new; | |
196 | u8 mcast_addr[ETH_ALEN]; | |
197 | int ret; | |
198 | ||
199 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
200 | * snooping code of the Linux bridge already does that for us | |
201 | */ | |
202 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
203 | if (ret < 0) | |
204 | goto out; | |
205 | ||
206 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
207 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); | |
208 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
209 | continue; | |
210 | ||
211 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
212 | if (!new) { | |
213 | ret = -ENOMEM; | |
214 | break; | |
215 | } | |
216 | ||
217 | ether_addr_copy(new->addr, mcast_addr); | |
218 | hlist_add_head(&new->list, mcast_list); | |
219 | } | |
220 | ||
221 | out: | |
222 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
223 | list_del(&br_ip_entry->list); | |
224 | kfree(br_ip_entry); | |
225 | } | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
c5caf4ef LL |
230 | /** |
231 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
2c72d655 | 232 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
233 | * @mcast_list: the list to free |
234 | * | |
235 | * Removes and frees all items in the given mcast_list. | |
236 | */ | |
2c72d655 SE |
237 | static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv, |
238 | struct hlist_head *mcast_list) | |
c5caf4ef LL |
239 | { |
240 | struct batadv_hw_addr *mcast_entry; | |
241 | struct hlist_node *tmp; | |
242 | ||
2c72d655 SE |
243 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
244 | ||
c5caf4ef LL |
245 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
246 | hlist_del(&mcast_entry->list); | |
247 | kfree(mcast_entry); | |
248 | } | |
249 | } | |
250 | ||
251 | /** | |
252 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
253 | * @bat_priv: the bat priv with all the soft interface information | |
254 | * @mcast_list: a list of addresses which should _not_ be removed | |
255 | * | |
256 | * Retracts the announcement of any multicast listener from the | |
257 | * translation table except the ones listed in the given mcast_list. | |
258 | * | |
259 | * If mcast_list is NULL then all are retracted. | |
260 | */ | |
261 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
262 | struct hlist_head *mcast_list) | |
263 | { | |
264 | struct batadv_hw_addr *mcast_entry; | |
265 | struct hlist_node *tmp; | |
266 | ||
2c72d655 SE |
267 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
268 | ||
c5caf4ef LL |
269 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
270 | list) { | |
271 | if (mcast_list && | |
272 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
273 | mcast_list)) | |
274 | continue; | |
275 | ||
276 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
277 | BATADV_NO_FLAGS, | |
278 | "mcast TT outdated", false); | |
279 | ||
280 | hlist_del(&mcast_entry->list); | |
281 | kfree(mcast_entry); | |
282 | } | |
283 | } | |
284 | ||
285 | /** | |
286 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
287 | * @bat_priv: the bat priv with all the soft interface information | |
288 | * @mcast_list: a list of addresses which are going to get added | |
289 | * | |
290 | * Adds multicast listener announcements from the given mcast_list to the | |
291 | * translation table if they have not been added yet. | |
292 | */ | |
293 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
294 | struct hlist_head *mcast_list) | |
295 | { | |
296 | struct batadv_hw_addr *mcast_entry; | |
297 | struct hlist_node *tmp; | |
298 | ||
2c72d655 SE |
299 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
300 | ||
c5caf4ef LL |
301 | if (!mcast_list) |
302 | return; | |
303 | ||
304 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
305 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
306 | &bat_priv->mcast.mla_list)) | |
307 | continue; | |
308 | ||
309 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
310 | mcast_entry->addr, BATADV_NO_FLAGS, | |
311 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
312 | continue; | |
313 | ||
314 | hlist_del(&mcast_entry->list); | |
315 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
316 | } | |
317 | } | |
318 | ||
319 | /** | |
320 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
321 | * @bat_priv: the bat priv with all the soft interface information | |
322 | * | |
62fe710f SE |
323 | * Checks whether there is a bridge on top of our soft interface. |
324 | * | |
325 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
326 | */ |
327 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
328 | { | |
329 | struct net_device *upper = bat_priv->soft_iface; | |
330 | ||
331 | rcu_read_lock(); | |
332 | do { | |
333 | upper = netdev_master_upper_dev_get_rcu(upper); | |
334 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
335 | rcu_read_unlock(); | |
336 | ||
337 | return upper; | |
338 | } | |
339 | ||
72f7b2de LL |
340 | /** |
341 | * batadv_mcast_querier_log - debug output regarding the querier status on link | |
342 | * @bat_priv: the bat priv with all the soft interface information | |
343 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") | |
344 | * @old_state: the previous querier state on our link | |
345 | * @new_state: the new querier state on our link | |
346 | * | |
347 | * Outputs debug messages to the logging facility with log level 'mcast' | |
348 | * regarding changes to the querier status on the link which are relevant | |
349 | * to our multicast optimizations. | |
350 | * | |
351 | * Usually this is about whether a querier appeared or vanished in | |
352 | * our mesh or whether the querier is in the suboptimal position of being | |
353 | * behind our local bridge segment: Snooping switches will directly | |
354 | * forward listener reports to the querier, therefore batman-adv and | |
355 | * the bridge will potentially not see these listeners - the querier is | |
356 | * potentially shadowing listeners from us then. | |
357 | * | |
358 | * This is only interesting for nodes with a bridge on top of their | |
359 | * soft interface. | |
360 | */ | |
361 | static void | |
362 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, | |
363 | struct batadv_mcast_querier_state *old_state, | |
364 | struct batadv_mcast_querier_state *new_state) | |
365 | { | |
366 | if (!old_state->exists && new_state->exists) | |
367 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", | |
368 | str_proto); | |
369 | else if (old_state->exists && !new_state->exists) | |
370 | batadv_info(bat_priv->soft_iface, | |
371 | "%s Querier disappeared - multicast optimizations disabled\n", | |
372 | str_proto); | |
373 | else if (!bat_priv->mcast.bridged && !new_state->exists) | |
374 | batadv_info(bat_priv->soft_iface, | |
375 | "No %s Querier present - multicast optimizations disabled\n", | |
376 | str_proto); | |
377 | ||
378 | if (new_state->exists) { | |
379 | if ((!old_state->shadowing && new_state->shadowing) || | |
380 | (!old_state->exists && new_state->shadowing)) | |
381 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
382 | "%s Querier is behind our bridged segment: Might shadow listeners\n", | |
383 | str_proto); | |
384 | else if (old_state->shadowing && !new_state->shadowing) | |
385 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
386 | "%s Querier is not behind our bridged segment\n", | |
387 | str_proto); | |
388 | } | |
389 | } | |
390 | ||
391 | /** | |
392 | * batadv_mcast_bridge_log - debug output for topology changes in bridged setups | |
393 | * @bat_priv: the bat priv with all the soft interface information | |
394 | * @bridged: a flag about whether the soft interface is currently bridged or not | |
395 | * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier | |
396 | * @querier_ipv6: (maybe) new status of a potential, selected MLD querier | |
397 | * | |
398 | * If no bridges are ever used on this node, then this function does nothing. | |
399 | * | |
400 | * Otherwise this function outputs debug information to the 'mcast' log level | |
401 | * which might be relevant to our multicast optimizations. | |
402 | * | |
403 | * More precisely, it outputs information when a bridge interface is added or | |
404 | * removed from a soft interface. And when a bridge is present, it further | |
405 | * outputs information about the querier state which is relevant for the | |
406 | * multicast flags this node is going to set. | |
407 | */ | |
408 | static void | |
409 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged, | |
410 | struct batadv_mcast_querier_state *querier_ipv4, | |
411 | struct batadv_mcast_querier_state *querier_ipv6) | |
412 | { | |
413 | if (!bat_priv->mcast.bridged && bridged) | |
414 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
415 | "Bridge added: Setting Unsnoopables(U)-flag\n"); | |
416 | else if (bat_priv->mcast.bridged && !bridged) | |
417 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
418 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); | |
419 | ||
420 | if (bridged) { | |
421 | batadv_mcast_querier_log(bat_priv, "IGMP", | |
422 | &bat_priv->mcast.querier_ipv4, | |
423 | querier_ipv4); | |
424 | batadv_mcast_querier_log(bat_priv, "MLD", | |
425 | &bat_priv->mcast.querier_ipv6, | |
426 | querier_ipv6); | |
427 | } | |
428 | } | |
429 | ||
430 | /** | |
431 | * batadv_mcast_flags_logs - output debug information about mcast flag changes | |
432 | * @bat_priv: the bat priv with all the soft interface information | |
433 | * @flags: flags indicating the new multicast state | |
434 | * | |
435 | * Whenever the multicast flags this nodes announces changes (@mcast_flags vs. | |
436 | * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level. | |
437 | */ | |
438 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) | |
439 | { | |
440 | u8 old_flags = bat_priv->mcast.flags; | |
441 | char str_old_flags[] = "[...]"; | |
442 | ||
443 | sprintf(str_old_flags, "[%c%c%c]", | |
444 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
445 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
446 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
447 | ||
448 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
449 | "Changing multicast flags from '%s' to '[%c%c%c]'\n", | |
450 | bat_priv->mcast.enabled ? str_old_flags : "<undefined>", | |
451 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
452 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
453 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
454 | } | |
455 | ||
60432d75 LL |
456 | /** |
457 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
458 | * @bat_priv: the bat priv with all the soft interface information | |
459 | * | |
460 | * Updates the own multicast tvlv with our current multicast related settings, | |
461 | * capabilities and inabilities. | |
462 | * | |
687937ab LL |
463 | * Return: false if we want all IPv4 && IPv6 multicast traffic and true |
464 | * otherwise. | |
60432d75 LL |
465 | */ |
466 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
467 | { | |
468 | struct batadv_tvlv_mcast_data mcast_data; | |
687937ab LL |
469 | struct batadv_mcast_querier_state querier4 = {false, false}; |
470 | struct batadv_mcast_querier_state querier6 = {false, false}; | |
471 | struct net_device *dev = bat_priv->soft_iface; | |
72f7b2de | 472 | bool bridged; |
60432d75 LL |
473 | |
474 | mcast_data.flags = BATADV_NO_FLAGS; | |
475 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
476 | ||
72f7b2de LL |
477 | bridged = batadv_mcast_has_bridge(bat_priv); |
478 | if (!bridged) | |
687937ab LL |
479 | goto update; |
480 | ||
481 | #if !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING) | |
482 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
483 | #endif | |
484 | ||
485 | querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
486 | querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
487 | ||
488 | querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
489 | querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
490 | ||
491 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
492 | ||
493 | /* 1) If no querier exists at all, then multicast listeners on | |
494 | * our local TT clients behind the bridge will keep silent. | |
495 | * 2) If the selected querier is on one of our local TT clients, | |
496 | * behind the bridge, then this querier might shadow multicast | |
497 | * listeners on our local TT clients, behind this bridge. | |
498 | * | |
499 | * In both cases, we will signalize other batman nodes that | |
500 | * we need all multicast traffic of the according protocol. | |
60432d75 | 501 | */ |
687937ab LL |
502 | if (!querier4.exists || querier4.shadowing) |
503 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
60432d75 | 504 | |
687937ab LL |
505 | if (!querier6.exists || querier6.shadowing) |
506 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
60432d75 | 507 | |
687937ab | 508 | update: |
72f7b2de LL |
509 | batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6); |
510 | ||
511 | bat_priv->mcast.querier_ipv4.exists = querier4.exists; | |
512 | bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing; | |
513 | ||
514 | bat_priv->mcast.querier_ipv6.exists = querier6.exists; | |
515 | bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing; | |
516 | ||
517 | bat_priv->mcast.bridged = bridged; | |
518 | ||
60432d75 LL |
519 | if (!bat_priv->mcast.enabled || |
520 | mcast_data.flags != bat_priv->mcast.flags) { | |
72f7b2de | 521 | batadv_mcast_flags_log(bat_priv, mcast_data.flags); |
bd2a979e | 522 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
60432d75 LL |
523 | &mcast_data, sizeof(mcast_data)); |
524 | bat_priv->mcast.flags = mcast_data.flags; | |
525 | bat_priv->mcast.enabled = true; | |
526 | } | |
527 | ||
687937ab LL |
528 | return !(mcast_data.flags & |
529 | (BATADV_MCAST_WANT_ALL_IPV4 + BATADV_MCAST_WANT_ALL_IPV6)); | |
60432d75 LL |
530 | } |
531 | ||
c5caf4ef LL |
532 | /** |
533 | * batadv_mcast_mla_update - update the own MLAs | |
534 | * @bat_priv: the bat priv with all the soft interface information | |
535 | * | |
60432d75 LL |
536 | * Updates the own multicast listener announcements in the translation |
537 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
538 | */ |
539 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
540 | { | |
541 | struct net_device *soft_iface = bat_priv->soft_iface; | |
542 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
543 | int ret; | |
544 | ||
60432d75 | 545 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
546 | goto update; |
547 | ||
548 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
549 | if (ret < 0) | |
550 | goto out; | |
551 | ||
687937ab LL |
552 | ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); |
553 | if (ret < 0) | |
554 | goto out; | |
555 | ||
c5caf4ef LL |
556 | update: |
557 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
558 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
559 | ||
560 | out: | |
2c72d655 | 561 | batadv_mcast_mla_list_free(bat_priv, &mcast_list); |
c5caf4ef LL |
562 | } |
563 | ||
bd2a979e LL |
564 | /** |
565 | * batadv_mcast_is_report_ipv4 - check for IGMP reports | |
566 | * @skb: the ethernet frame destined for the mesh | |
567 | * | |
568 | * This call might reallocate skb data. | |
569 | * | |
570 | * Checks whether the given frame is a valid IGMP report. | |
571 | * | |
572 | * Return: If so then true, otherwise false. | |
573 | */ | |
574 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
575 | { | |
576 | if (ip_mc_check_igmp(skb, NULL) < 0) | |
577 | return false; | |
578 | ||
579 | switch (igmp_hdr(skb)->type) { | |
580 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
581 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
582 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
583 | return true; | |
584 | } | |
585 | ||
586 | return false; | |
587 | } | |
588 | ||
ab49886e LL |
589 | /** |
590 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
591 | * @bat_priv: the bat priv with all the soft interface information | |
592 | * @skb: the IPv4 packet to check | |
593 | * @is_unsnoopable: stores whether the destination is snoopable | |
594 | * | |
595 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
596 | * mode more optimal than classic flooding. | |
597 | * | |
62fe710f SE |
598 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
599 | * allocation failure. | |
ab49886e LL |
600 | */ |
601 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
602 | struct sk_buff *skb, | |
603 | bool *is_unsnoopable) | |
604 | { | |
605 | struct iphdr *iphdr; | |
606 | ||
607 | /* We might fail due to out-of-memory -> drop it */ | |
608 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
609 | return -ENOMEM; | |
610 | ||
bd2a979e LL |
611 | if (batadv_mcast_is_report_ipv4(skb)) |
612 | return -EINVAL; | |
613 | ||
ab49886e LL |
614 | iphdr = ip_hdr(skb); |
615 | ||
616 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
617 | * then allow scope > link local, too | |
618 | */ | |
619 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
620 | return -EINVAL; | |
621 | ||
622 | /* link-local multicast listeners behind a bridge are | |
623 | * not snoopable (see RFC4541, section 2.1.2.2) | |
624 | */ | |
625 | *is_unsnoopable = true; | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
bd2a979e LL |
630 | #if IS_ENABLED(CONFIG_IPV6) |
631 | /** | |
632 | * batadv_mcast_is_report_ipv6 - check for MLD reports | |
633 | * @skb: the ethernet frame destined for the mesh | |
634 | * | |
635 | * This call might reallocate skb data. | |
636 | * | |
637 | * Checks whether the given frame is a valid MLD report. | |
638 | * | |
639 | * Return: If so then true, otherwise false. | |
640 | */ | |
641 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
642 | { | |
643 | if (ipv6_mc_check_mld(skb, NULL) < 0) | |
644 | return false; | |
645 | ||
646 | switch (icmp6_hdr(skb)->icmp6_type) { | |
647 | case ICMPV6_MGM_REPORT: | |
648 | case ICMPV6_MLD2_REPORT: | |
649 | return true; | |
650 | } | |
651 | ||
652 | return false; | |
653 | } | |
654 | ||
1d8ab8d3 LL |
655 | /** |
656 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
657 | * @bat_priv: the bat priv with all the soft interface information | |
658 | * @skb: the IPv6 packet to check | |
ab49886e | 659 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
660 | * |
661 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
662 | * mode more optimal than classic flooding. | |
663 | * | |
62fe710f | 664 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
665 | */ |
666 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
667 | struct sk_buff *skb, |
668 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
669 | { |
670 | struct ipv6hdr *ip6hdr; | |
671 | ||
672 | /* We might fail due to out-of-memory -> drop it */ | |
673 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
674 | return -ENOMEM; | |
675 | ||
bd2a979e LL |
676 | if (batadv_mcast_is_report_ipv6(skb)) |
677 | return -EINVAL; | |
678 | ||
1d8ab8d3 LL |
679 | ip6hdr = ipv6_hdr(skb); |
680 | ||
681 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
682 | * then allow scope > link local, too | |
683 | */ | |
684 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
685 | return -EINVAL; | |
686 | ||
687 | /* link-local-all-nodes multicast listeners behind a bridge are | |
688 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
689 | */ | |
690 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 691 | *is_unsnoopable = true; |
1d8ab8d3 LL |
692 | |
693 | return 0; | |
694 | } | |
bd2a979e | 695 | #endif |
1d8ab8d3 LL |
696 | |
697 | /** | |
698 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
699 | * @bat_priv: the bat priv with all the soft interface information | |
700 | * @skb: the multicast frame to check | |
ab49886e | 701 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
702 | * |
703 | * Checks whether the given multicast ethernet frame has the potential to be | |
704 | * forwarded with a mode more optimal than classic flooding. | |
705 | * | |
62fe710f | 706 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
707 | */ |
708 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
709 | struct sk_buff *skb, |
710 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
711 | { |
712 | struct ethhdr *ethhdr = eth_hdr(skb); | |
713 | ||
714 | if (!atomic_read(&bat_priv->multicast_mode)) | |
715 | return -EINVAL; | |
716 | ||
717 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
718 | return -EINVAL; | |
719 | ||
720 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
721 | case ETH_P_IP: |
722 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
723 | is_unsnoopable); | |
bd2a979e | 724 | #if IS_ENABLED(CONFIG_IPV6) |
1d8ab8d3 | 725 | case ETH_P_IPV6: |
ab49886e LL |
726 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
727 | is_unsnoopable); | |
bd2a979e | 728 | #endif |
1d8ab8d3 LL |
729 | default: |
730 | return -EINVAL; | |
731 | } | |
732 | } | |
733 | ||
4c8755d6 | 734 | /** |
6d030de8 AQ |
735 | * batadv_mcast_forw_want_all_ip_count - count nodes with unspecific mcast |
736 | * interest | |
4c8755d6 LL |
737 | * @bat_priv: the bat priv with all the soft interface information |
738 | * @ethhdr: ethernet header of a packet | |
739 | * | |
62fe710f | 740 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
741 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
742 | * IPv6 traffic if it matches an IPv6 packet. | |
743 | */ | |
744 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
745 | struct ethhdr *ethhdr) | |
746 | { | |
747 | switch (ntohs(ethhdr->h_proto)) { | |
748 | case ETH_P_IP: | |
749 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
750 | case ETH_P_IPV6: | |
751 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
752 | default: | |
753 | /* we shouldn't be here... */ | |
754 | return 0; | |
755 | } | |
756 | } | |
757 | ||
1d8ab8d3 LL |
758 | /** |
759 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
760 | * @bat_priv: the bat priv with all the soft interface information | |
761 | * @ethhdr: the ether header containing the multicast destination | |
762 | * | |
62fe710f | 763 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
764 | * via a translation table lookup. This increases the returned nodes refcount. |
765 | */ | |
766 | static struct batadv_orig_node * | |
767 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
768 | struct ethhdr *ethhdr) | |
769 | { | |
770 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
771 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
772 | } | |
773 | ||
4c8755d6 | 774 | /** |
6d030de8 | 775 | * batadv_mcast_forw_ipv4_node_get - get a node with an ipv4 flag |
4c8755d6 LL |
776 | * @bat_priv: the bat priv with all the soft interface information |
777 | * | |
62fe710f | 778 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
779 | * increases its refcount. |
780 | */ | |
781 | static struct batadv_orig_node * | |
782 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
783 | { | |
784 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
785 | ||
786 | rcu_read_lock(); | |
787 | hlist_for_each_entry_rcu(tmp_orig_node, | |
788 | &bat_priv->mcast.want_all_ipv4_list, | |
789 | mcast_want_all_ipv4_node) { | |
7c124391 | 790 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
791 | continue; |
792 | ||
793 | orig_node = tmp_orig_node; | |
794 | break; | |
795 | } | |
796 | rcu_read_unlock(); | |
797 | ||
798 | return orig_node; | |
799 | } | |
800 | ||
801 | /** | |
6d030de8 | 802 | * batadv_mcast_forw_ipv6_node_get - get a node with an ipv6 flag |
4c8755d6 LL |
803 | * @bat_priv: the bat priv with all the soft interface information |
804 | * | |
62fe710f | 805 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
806 | * and increases its refcount. |
807 | */ | |
808 | static struct batadv_orig_node * | |
809 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
810 | { | |
811 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
812 | ||
813 | rcu_read_lock(); | |
814 | hlist_for_each_entry_rcu(tmp_orig_node, | |
815 | &bat_priv->mcast.want_all_ipv6_list, | |
816 | mcast_want_all_ipv6_node) { | |
7c124391 | 817 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
818 | continue; |
819 | ||
820 | orig_node = tmp_orig_node; | |
821 | break; | |
822 | } | |
823 | rcu_read_unlock(); | |
824 | ||
825 | return orig_node; | |
826 | } | |
827 | ||
828 | /** | |
6d030de8 | 829 | * batadv_mcast_forw_ip_node_get - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
830 | * @bat_priv: the bat priv with all the soft interface information |
831 | * @ethhdr: an ethernet header to determine the protocol family from | |
832 | * | |
62fe710f | 833 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
834 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
835 | * increases its refcount. | |
836 | */ | |
837 | static struct batadv_orig_node * | |
838 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
839 | struct ethhdr *ethhdr) | |
840 | { | |
841 | switch (ntohs(ethhdr->h_proto)) { | |
842 | case ETH_P_IP: | |
843 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
844 | case ETH_P_IPV6: | |
845 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
846 | default: | |
847 | /* we shouldn't be here... */ | |
848 | return NULL; | |
849 | } | |
850 | } | |
851 | ||
ab49886e | 852 | /** |
6d030de8 | 853 | * batadv_mcast_forw_unsnoop_node_get - get a node with an unsnoopable flag |
ab49886e LL |
854 | * @bat_priv: the bat priv with all the soft interface information |
855 | * | |
62fe710f | 856 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
857 | * set and increases its refcount. |
858 | */ | |
859 | static struct batadv_orig_node * | |
860 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
861 | { | |
862 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
863 | ||
864 | rcu_read_lock(); | |
865 | hlist_for_each_entry_rcu(tmp_orig_node, | |
866 | &bat_priv->mcast.want_all_unsnoopables_list, | |
867 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 868 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
869 | continue; |
870 | ||
871 | orig_node = tmp_orig_node; | |
872 | break; | |
873 | } | |
874 | rcu_read_unlock(); | |
875 | ||
876 | return orig_node; | |
877 | } | |
878 | ||
1d8ab8d3 LL |
879 | /** |
880 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
881 | * @bat_priv: the bat priv with all the soft interface information | |
882 | * @skb: The multicast packet to check | |
883 | * @orig: an originator to be set to forward the skb to | |
884 | * | |
62fe710f | 885 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
886 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
887 | * should be forwarded to. | |
888 | */ | |
889 | enum batadv_forw_mode | |
890 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
891 | struct batadv_orig_node **orig) | |
892 | { | |
4c8755d6 | 893 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 894 | bool is_unsnoopable = false; |
1d8ab8d3 | 895 | struct ethhdr *ethhdr; |
1d8ab8d3 | 896 | |
ab49886e | 897 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
898 | if (ret == -ENOMEM) |
899 | return BATADV_FORW_NONE; | |
900 | else if (ret < 0) | |
901 | return BATADV_FORW_ALL; | |
902 | ||
903 | ethhdr = eth_hdr(skb); | |
904 | ||
905 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
906 | BATADV_NO_FLAGS); | |
4c8755d6 | 907 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
908 | unsnoop_count = !is_unsnoopable ? 0 : |
909 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
910 | ||
4c8755d6 | 911 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 912 | |
ab49886e | 913 | switch (total_count) { |
1d8ab8d3 | 914 | case 1: |
ab49886e LL |
915 | if (tt_count) |
916 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
917 | else if (ip_count) |
918 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
919 | else if (unsnoop_count) |
920 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
921 | ||
1d8ab8d3 LL |
922 | if (*orig) |
923 | return BATADV_FORW_SINGLE; | |
924 | ||
925 | /* fall through */ | |
926 | case 0: | |
927 | return BATADV_FORW_NONE; | |
928 | default: | |
929 | return BATADV_FORW_ALL; | |
930 | } | |
931 | } | |
932 | ||
ab49886e LL |
933 | /** |
934 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
935 | * @bat_priv: the bat priv with all the soft interface information | |
936 | * @orig: the orig_node which multicast state might have changed of | |
937 | * @mcast_flags: flags indicating the new multicast state | |
938 | * | |
939 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
940 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
941 | * |
942 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
943 | */ |
944 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
945 | struct batadv_orig_node *orig, | |
6b5e971a | 946 | u8 mcast_flags) |
ab49886e | 947 | { |
8a4023c5 LL |
948 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
949 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
950 | ||
5274cd68 SE |
951 | lockdep_assert_held(&orig->mcast_handler_lock); |
952 | ||
ab49886e LL |
953 | /* switched from flag unset to set */ |
954 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
955 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
956 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
957 | ||
958 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
959 | /* flag checks above + mcast_handler_lock prevents this */ |
960 | WARN_ON(!hlist_unhashed(node)); | |
961 | ||
962 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
963 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
964 | /* switched from flag set to unset */ | |
965 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
966 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
967 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
968 | ||
969 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
970 | /* flag checks above + mcast_handler_lock prevents this */ |
971 | WARN_ON(hlist_unhashed(node)); | |
972 | ||
973 | hlist_del_init_rcu(node); | |
ab49886e LL |
974 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
975 | } | |
976 | } | |
977 | ||
4c8755d6 LL |
978 | /** |
979 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
980 | * @bat_priv: the bat priv with all the soft interface information | |
981 | * @orig: the orig_node which multicast state might have changed of | |
982 | * @mcast_flags: flags indicating the new multicast state | |
983 | * | |
984 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
985 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
986 | * |
987 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
988 | */ |
989 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
990 | struct batadv_orig_node *orig, | |
6b5e971a | 991 | u8 mcast_flags) |
4c8755d6 | 992 | { |
8a4023c5 LL |
993 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
994 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
995 | ||
5274cd68 SE |
996 | lockdep_assert_held(&orig->mcast_handler_lock); |
997 | ||
4c8755d6 LL |
998 | /* switched from flag unset to set */ |
999 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
1000 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
1001 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
1002 | ||
1003 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1004 | /* flag checks above + mcast_handler_lock prevents this */ |
1005 | WARN_ON(!hlist_unhashed(node)); | |
1006 | ||
1007 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1008 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1009 | /* switched from flag set to unset */ | |
1010 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
1011 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
1012 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
1013 | ||
1014 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1015 | /* flag checks above + mcast_handler_lock prevents this */ |
1016 | WARN_ON(hlist_unhashed(node)); | |
1017 | ||
1018 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1019 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1020 | } | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
1025 | * @bat_priv: the bat priv with all the soft interface information | |
1026 | * @orig: the orig_node which multicast state might have changed of | |
1027 | * @mcast_flags: flags indicating the new multicast state | |
1028 | * | |
1029 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
1030 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1031 | * |
1032 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1033 | */ |
1034 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
1035 | struct batadv_orig_node *orig, | |
6b5e971a | 1036 | u8 mcast_flags) |
4c8755d6 | 1037 | { |
8a4023c5 LL |
1038 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1039 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
1040 | ||
5274cd68 SE |
1041 | lockdep_assert_held(&orig->mcast_handler_lock); |
1042 | ||
4c8755d6 LL |
1043 | /* switched from flag unset to set */ |
1044 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
1045 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
1046 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
1047 | ||
1048 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1049 | /* flag checks above + mcast_handler_lock prevents this */ |
1050 | WARN_ON(!hlist_unhashed(node)); | |
1051 | ||
1052 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1053 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1054 | /* switched from flag set to unset */ | |
1055 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
1056 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
1057 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
1058 | ||
1059 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1060 | /* flag checks above + mcast_handler_lock prevents this */ |
1061 | WARN_ON(hlist_unhashed(node)); | |
1062 | ||
1063 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1064 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1065 | } | |
1066 | } | |
1067 | ||
60432d75 | 1068 | /** |
bd2a979e | 1069 | * batadv_mcast_tvlv_ogm_handler - process incoming multicast tvlv container |
60432d75 LL |
1070 | * @bat_priv: the bat priv with all the soft interface information |
1071 | * @orig: the orig_node of the ogm | |
1072 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
1073 | * @tvlv_value: tvlv buffer containing the multicast data | |
1074 | * @tvlv_value_len: tvlv buffer length | |
1075 | */ | |
bd2a979e LL |
1076 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
1077 | struct batadv_orig_node *orig, | |
1078 | u8 flags, | |
1079 | void *tvlv_value, | |
1080 | u16 tvlv_value_len) | |
60432d75 LL |
1081 | { |
1082 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 1083 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
1084 | bool orig_initialized; |
1085 | ||
8a4023c5 LL |
1086 | if (orig_mcast_enabled && tvlv_value && |
1087 | (tvlv_value_len >= sizeof(mcast_flags))) | |
6b5e971a | 1088 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
1089 | |
1090 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
1091 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
1092 | &orig->capa_initialized); | |
60432d75 LL |
1093 | |
1094 | /* If mcast support is turned on decrease the disabled mcast node | |
1095 | * counter only if we had increased it for this node before. If this | |
1096 | * is a completely new orig_node no need to decrease the counter. | |
1097 | */ | |
1098 | if (orig_mcast_enabled && | |
9c936e3f | 1099 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
1100 | if (orig_initialized) |
1101 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 1102 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
1103 | /* If mcast support is being switched off or if this is an initial |
1104 | * OGM without mcast support then increase the disabled mcast | |
1105 | * node counter. | |
60432d75 LL |
1106 | */ |
1107 | } else if (!orig_mcast_enabled && | |
9c936e3f | 1108 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 1109 | !orig_initialized)) { |
60432d75 | 1110 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 1111 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
1112 | } |
1113 | ||
9c936e3f | 1114 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 1115 | |
ab49886e | 1116 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
1117 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
1118 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 1119 | |
60432d75 | 1120 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 1121 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * batadv_mcast_init - initialize the multicast optimizations structures | |
1126 | * @bat_priv: the bat priv with all the soft interface information | |
1127 | */ | |
1128 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
1129 | { | |
bd2a979e LL |
1130 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
1131 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 LL |
1132 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
1133 | } | |
1134 | ||
4e3e823b LL |
1135 | /** |
1136 | * batadv_mcast_flags_print_header - print own mcast flags to debugfs table | |
1137 | * @bat_priv: the bat priv with all the soft interface information | |
1138 | * @seq: debugfs table seq_file struct | |
1139 | * | |
1140 | * Prints our own multicast flags including a more specific reason why | |
1141 | * they are set, that is prints the bridge and querier state too, to | |
1142 | * the debugfs table specified via @seq. | |
1143 | */ | |
1144 | static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv, | |
1145 | struct seq_file *seq) | |
1146 | { | |
1147 | u8 flags = bat_priv->mcast.flags; | |
1148 | char querier4, querier6, shadowing4, shadowing6; | |
1149 | bool bridged = bat_priv->mcast.bridged; | |
1150 | ||
1151 | if (bridged) { | |
1152 | querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4'; | |
1153 | querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6'; | |
1154 | shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.'; | |
1155 | shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.'; | |
1156 | } else { | |
1157 | querier4 = '?'; | |
1158 | querier6 = '?'; | |
1159 | shadowing4 = '?'; | |
1160 | shadowing6 = '?'; | |
1161 | } | |
1162 | ||
1163 | seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n", | |
1164 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
1165 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
1166 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
1167 | seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.'); | |
1168 | seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n", | |
1169 | querier4, querier6); | |
1170 | seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n", | |
1171 | shadowing4, shadowing6); | |
1172 | seq_puts(seq, "-------------------------------------------\n"); | |
1173 | seq_printf(seq, " %-10s %s\n", "Originator", "Flags"); | |
1174 | } | |
1175 | ||
1176 | /** | |
1177 | * batadv_mcast_flags_seq_print_text - print the mcast flags of other nodes | |
1178 | * @seq: seq file to print on | |
1179 | * @offset: not used | |
1180 | * | |
1181 | * This prints a table of (primary) originators and their according | |
1182 | * multicast flags, including (in the header) our own. | |
1183 | * | |
1184 | * Return: always 0 | |
1185 | */ | |
1186 | int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset) | |
1187 | { | |
1188 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1189 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1190 | struct batadv_hard_iface *primary_if; | |
1191 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1192 | struct batadv_orig_node *orig_node; | |
1193 | struct hlist_head *head; | |
1194 | u8 flags; | |
1195 | u32 i; | |
1196 | ||
1197 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1198 | if (!primary_if) | |
1199 | return 0; | |
1200 | ||
1201 | batadv_mcast_flags_print_header(bat_priv, seq); | |
1202 | ||
1203 | for (i = 0; i < hash->size; i++) { | |
1204 | head = &hash->table[i]; | |
1205 | ||
1206 | rcu_read_lock(); | |
1207 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1208 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1209 | &orig_node->capa_initialized)) | |
1210 | continue; | |
1211 | ||
1212 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1213 | &orig_node->capabilities)) { | |
1214 | seq_printf(seq, "%pM -\n", orig_node->orig); | |
1215 | continue; | |
1216 | } | |
1217 | ||
1218 | flags = orig_node->mcast_flags; | |
1219 | ||
1220 | seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig, | |
1221 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) | |
1222 | ? 'U' : '.', | |
1223 | (flags & BATADV_MCAST_WANT_ALL_IPV4) | |
1224 | ? '4' : '.', | |
1225 | (flags & BATADV_MCAST_WANT_ALL_IPV6) | |
1226 | ? '6' : '.'); | |
1227 | } | |
1228 | rcu_read_unlock(); | |
1229 | } | |
1230 | ||
1231 | batadv_hardif_put(primary_if); | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
c5caf4ef LL |
1236 | /** |
1237 | * batadv_mcast_free - free the multicast optimizations structures | |
1238 | * @bat_priv: the bat priv with all the soft interface information | |
1239 | */ | |
1240 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
1241 | { | |
bd2a979e LL |
1242 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
1243 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 1244 | |
af63cf51 | 1245 | spin_lock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 1246 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
af63cf51 | 1247 | spin_unlock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 1248 | } |
60432d75 LL |
1249 | |
1250 | /** | |
1251 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
1252 | * @orig: the originator which is going to get purged | |
1253 | */ | |
1254 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
1255 | { | |
1256 | struct batadv_priv *bat_priv = orig->bat_priv; | |
1257 | ||
8a4023c5 LL |
1258 | spin_lock_bh(&orig->mcast_handler_lock); |
1259 | ||
9c936e3f LL |
1260 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
1261 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 1262 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
1263 | |
1264 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
1265 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
1266 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
1267 | |
1268 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 1269 | } |