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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6b1aea8c | 2 | /* Copyright (C) 2014-2018 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> |
53dd9a68 | 43 | #include <linux/netlink.h> |
687937ab | 44 | #include <linux/printk.h> |
1e2c2a4f SE |
45 | #include <linux/rculist.h> |
46 | #include <linux/rcupdate.h> | |
4e3e823b | 47 | #include <linux/seq_file.h> |
1e2c2a4f SE |
48 | #include <linux/skbuff.h> |
49 | #include <linux/slab.h> | |
50 | #include <linux/spinlock.h> | |
51 | #include <linux/stddef.h> | |
52 | #include <linux/string.h> | |
53 | #include <linux/types.h> | |
cbebd363 | 54 | #include <linux/workqueue.h> |
1e2c2a4f | 55 | #include <net/addrconf.h> |
53dd9a68 | 56 | #include <net/genetlink.h> |
687937ab LL |
57 | #include <net/if_inet6.h> |
58 | #include <net/ip.h> | |
1e2c2a4f | 59 | #include <net/ipv6.h> |
53dd9a68 LL |
60 | #include <net/netlink.h> |
61 | #include <net/sock.h> | |
fec149f5 | 62 | #include <uapi/linux/batadv_packet.h> |
53dd9a68 | 63 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f | 64 | |
4e3e823b LL |
65 | #include "hard-interface.h" |
66 | #include "hash.h" | |
ba412080 | 67 | #include "log.h" |
53dd9a68 LL |
68 | #include "netlink.h" |
69 | #include "soft-interface.h" | |
c5caf4ef | 70 | #include "translation-table.h" |
1f8dce49 | 71 | #include "tvlv.h" |
c5caf4ef | 72 | |
cbebd363 LL |
73 | static void batadv_mcast_mla_update(struct work_struct *work); |
74 | ||
75 | /** | |
7e9a8c2c | 76 | * batadv_mcast_start_timer() - schedule the multicast periodic worker |
cbebd363 LL |
77 | * @bat_priv: the bat priv with all the soft interface information |
78 | */ | |
79 | static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) | |
80 | { | |
81 | queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, | |
82 | msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); | |
83 | } | |
84 | ||
687937ab | 85 | /** |
7e9a8c2c | 86 | * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists |
687937ab LL |
87 | * @soft_iface: netdev struct of the mesh interface |
88 | * | |
89 | * If the given soft interface has a bridge on top then the refcount | |
90 | * of the according net device is increased. | |
91 | * | |
92 | * Return: NULL if no such bridge exists. Otherwise the net device of the | |
93 | * bridge. | |
94 | */ | |
95 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) | |
96 | { | |
97 | struct net_device *upper = soft_iface; | |
98 | ||
99 | rcu_read_lock(); | |
100 | do { | |
101 | upper = netdev_master_upper_dev_get_rcu(upper); | |
102 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
103 | ||
104 | if (upper) | |
105 | dev_hold(upper); | |
106 | rcu_read_unlock(); | |
107 | ||
108 | return upper; | |
109 | } | |
110 | ||
6b253603 LL |
111 | /** |
112 | * batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4 | |
113 | * @addr: the MAC address to check | |
114 | * | |
115 | * Return: True, if MAC address is one reserved for IPv4 multicast, false | |
116 | * otherwise. | |
117 | */ | |
118 | static bool batadv_mcast_addr_is_ipv4(const u8 *addr) | |
119 | { | |
120 | static const u8 prefix[] = {0x01, 0x00, 0x5E}; | |
121 | ||
122 | return memcmp(prefix, addr, sizeof(prefix)) == 0; | |
123 | } | |
124 | ||
125 | /** | |
126 | * batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6 | |
127 | * @addr: the MAC address to check | |
128 | * | |
129 | * Return: True, if MAC address is one reserved for IPv6 multicast, false | |
130 | * otherwise. | |
131 | */ | |
132 | static bool batadv_mcast_addr_is_ipv6(const u8 *addr) | |
133 | { | |
134 | static const u8 prefix[] = {0x33, 0x33}; | |
135 | ||
136 | return memcmp(prefix, addr, sizeof(prefix)) == 0; | |
137 | } | |
138 | ||
c5caf4ef | 139 | /** |
7e9a8c2c | 140 | * batadv_mcast_mla_softif_get() - get softif multicast listeners |
6b253603 | 141 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
142 | * @dev: the device to collect multicast addresses from |
143 | * @mcast_list: a list to put found addresses into | |
144 | * | |
687937ab LL |
145 | * Collects multicast addresses of multicast listeners residing |
146 | * on this kernel on the given soft interface, dev, in | |
147 | * the given mcast_list. In general, multicast listeners provided by | |
148 | * your multicast receiving applications run directly on this node. | |
149 | * | |
150 | * If there is a bridge interface on top of dev, collects from that one | |
151 | * instead. Just like with IP addresses and routes, multicast listeners | |
152 | * will(/should) register to the bridge interface instead of an | |
153 | * enslaved bat0. | |
c5caf4ef | 154 | * |
62fe710f | 155 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
156 | * items added to the mcast_list otherwise. |
157 | */ | |
6b253603 LL |
158 | static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv, |
159 | struct net_device *dev, | |
c5caf4ef LL |
160 | struct hlist_head *mcast_list) |
161 | { | |
6b253603 LL |
162 | bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; |
163 | bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; | |
687937ab | 164 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
c5caf4ef LL |
165 | struct netdev_hw_addr *mc_list_entry; |
166 | struct batadv_hw_addr *new; | |
167 | int ret = 0; | |
168 | ||
687937ab LL |
169 | netif_addr_lock_bh(bridge ? bridge : dev); |
170 | netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { | |
6b253603 LL |
171 | if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr)) |
172 | continue; | |
173 | ||
174 | if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr)) | |
175 | continue; | |
176 | ||
c5caf4ef LL |
177 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
178 | if (!new) { | |
179 | ret = -ENOMEM; | |
180 | break; | |
181 | } | |
182 | ||
183 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
184 | hlist_add_head(&new->list, mcast_list); | |
185 | ret++; | |
186 | } | |
687937ab LL |
187 | netif_addr_unlock_bh(bridge ? bridge : dev); |
188 | ||
189 | if (bridge) | |
190 | dev_put(bridge); | |
c5caf4ef LL |
191 | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /** | |
7e9a8c2c | 196 | * batadv_mcast_mla_is_duplicate() - check whether an address is in a list |
c5caf4ef LL |
197 | * @mcast_addr: the multicast address to check |
198 | * @mcast_list: the list with multicast addresses to search in | |
199 | * | |
62fe710f | 200 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
201 | * Otherwise returns false. |
202 | */ | |
6b5e971a | 203 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
204 | struct hlist_head *mcast_list) |
205 | { | |
206 | struct batadv_hw_addr *mcast_entry; | |
207 | ||
208 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
209 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
210 | return true; | |
211 | ||
212 | return false; | |
213 | } | |
214 | ||
687937ab | 215 | /** |
7e9a8c2c | 216 | * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address |
687937ab LL |
217 | * @dst: destination to write to - a multicast MAC address |
218 | * @src: source to read from - a multicast IP address | |
219 | * | |
220 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
221 | * to its matching multicast MAC address and copies it into the given | |
222 | * destination buffer. | |
223 | * | |
224 | * Caller needs to make sure the destination buffer can hold | |
225 | * at least ETH_ALEN bytes. | |
226 | */ | |
227 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
228 | { | |
229 | if (src->proto == htons(ETH_P_IP)) | |
230 | ip_eth_mc_map(src->u.ip4, dst); | |
231 | #if IS_ENABLED(CONFIG_IPV6) | |
232 | else if (src->proto == htons(ETH_P_IPV6)) | |
233 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
234 | #endif | |
235 | else | |
236 | eth_zero_addr(dst); | |
237 | } | |
238 | ||
239 | /** | |
7e9a8c2c | 240 | * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners |
6b253603 | 241 | * @bat_priv: the bat priv with all the soft interface information |
687937ab LL |
242 | * @dev: a bridge slave whose bridge to collect multicast addresses from |
243 | * @mcast_list: a list to put found addresses into | |
244 | * | |
245 | * Collects multicast addresses of multicast listeners residing | |
246 | * on foreign, non-mesh devices which we gave access to our mesh via | |
247 | * a bridge on top of the given soft interface, dev, in the given | |
248 | * mcast_list. | |
249 | * | |
250 | * Return: -ENOMEM on memory allocation error or the number of | |
251 | * items added to the mcast_list otherwise. | |
252 | */ | |
6b253603 LL |
253 | static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv, |
254 | struct net_device *dev, | |
687937ab LL |
255 | struct hlist_head *mcast_list) |
256 | { | |
257 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
6b253603 LL |
258 | bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; |
259 | bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; | |
687937ab LL |
260 | struct br_ip_list *br_ip_entry, *tmp; |
261 | struct batadv_hw_addr *new; | |
262 | u8 mcast_addr[ETH_ALEN]; | |
263 | int ret; | |
264 | ||
265 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
266 | * snooping code of the Linux bridge already does that for us | |
267 | */ | |
268 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
269 | if (ret < 0) | |
270 | goto out; | |
271 | ||
272 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
6b253603 LL |
273 | if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP)) |
274 | continue; | |
275 | ||
276 | if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6)) | |
277 | continue; | |
278 | ||
687937ab LL |
279 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); |
280 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
281 | continue; | |
282 | ||
283 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
284 | if (!new) { | |
285 | ret = -ENOMEM; | |
286 | break; | |
287 | } | |
288 | ||
289 | ether_addr_copy(new->addr, mcast_addr); | |
290 | hlist_add_head(&new->list, mcast_list); | |
291 | } | |
292 | ||
293 | out: | |
294 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
295 | list_del(&br_ip_entry->list); | |
296 | kfree(br_ip_entry); | |
297 | } | |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
c5caf4ef | 302 | /** |
7e9a8c2c | 303 | * batadv_mcast_mla_list_free() - free a list of multicast addresses |
c5caf4ef LL |
304 | * @mcast_list: the list to free |
305 | * | |
306 | * Removes and frees all items in the given mcast_list. | |
307 | */ | |
b7769763 | 308 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) |
c5caf4ef LL |
309 | { |
310 | struct batadv_hw_addr *mcast_entry; | |
311 | struct hlist_node *tmp; | |
312 | ||
313 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
314 | hlist_del(&mcast_entry->list); | |
315 | kfree(mcast_entry); | |
316 | } | |
317 | } | |
318 | ||
319 | /** | |
7e9a8c2c | 320 | * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements |
c5caf4ef LL |
321 | * @bat_priv: the bat priv with all the soft interface information |
322 | * @mcast_list: a list of addresses which should _not_ be removed | |
323 | * | |
324 | * Retracts the announcement of any multicast listener from the | |
325 | * translation table except the ones listed in the given mcast_list. | |
326 | * | |
327 | * If mcast_list is NULL then all are retracted. | |
cbebd363 LL |
328 | * |
329 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
330 | */ |
331 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
332 | struct hlist_head *mcast_list) | |
333 | { | |
334 | struct batadv_hw_addr *mcast_entry; | |
335 | struct hlist_node *tmp; | |
336 | ||
cbebd363 | 337 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 338 | |
c5caf4ef LL |
339 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
340 | list) { | |
341 | if (mcast_list && | |
342 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
343 | mcast_list)) | |
344 | continue; | |
345 | ||
346 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
347 | BATADV_NO_FLAGS, | |
348 | "mcast TT outdated", false); | |
349 | ||
350 | hlist_del(&mcast_entry->list); | |
351 | kfree(mcast_entry); | |
352 | } | |
353 | } | |
354 | ||
355 | /** | |
7e9a8c2c | 356 | * batadv_mcast_mla_tt_add() - add multicast listener announcements |
c5caf4ef LL |
357 | * @bat_priv: the bat priv with all the soft interface information |
358 | * @mcast_list: a list of addresses which are going to get added | |
359 | * | |
360 | * Adds multicast listener announcements from the given mcast_list to the | |
361 | * translation table if they have not been added yet. | |
cbebd363 LL |
362 | * |
363 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
364 | */ |
365 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
366 | struct hlist_head *mcast_list) | |
367 | { | |
368 | struct batadv_hw_addr *mcast_entry; | |
369 | struct hlist_node *tmp; | |
370 | ||
cbebd363 | 371 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 372 | |
c5caf4ef LL |
373 | if (!mcast_list) |
374 | return; | |
375 | ||
376 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
377 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
378 | &bat_priv->mcast.mla_list)) | |
379 | continue; | |
380 | ||
381 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
382 | mcast_entry->addr, BATADV_NO_FLAGS, | |
383 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
384 | continue; | |
385 | ||
386 | hlist_del(&mcast_entry->list); | |
387 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
388 | } | |
389 | } | |
390 | ||
391 | /** | |
7e9a8c2c | 392 | * batadv_mcast_has_bridge() - check whether the soft-iface is bridged |
c5caf4ef LL |
393 | * @bat_priv: the bat priv with all the soft interface information |
394 | * | |
62fe710f SE |
395 | * Checks whether there is a bridge on top of our soft interface. |
396 | * | |
397 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
398 | */ |
399 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
400 | { | |
401 | struct net_device *upper = bat_priv->soft_iface; | |
402 | ||
403 | rcu_read_lock(); | |
404 | do { | |
405 | upper = netdev_master_upper_dev_get_rcu(upper); | |
406 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
407 | rcu_read_unlock(); | |
408 | ||
409 | return upper; | |
410 | } | |
411 | ||
72f7b2de | 412 | /** |
7e9a8c2c SE |
413 | * batadv_mcast_querier_log() - debug output regarding the querier status on |
414 | * link | |
72f7b2de LL |
415 | * @bat_priv: the bat priv with all the soft interface information |
416 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") | |
417 | * @old_state: the previous querier state on our link | |
418 | * @new_state: the new querier state on our link | |
419 | * | |
420 | * Outputs debug messages to the logging facility with log level 'mcast' | |
421 | * regarding changes to the querier status on the link which are relevant | |
422 | * to our multicast optimizations. | |
423 | * | |
424 | * Usually this is about whether a querier appeared or vanished in | |
425 | * our mesh or whether the querier is in the suboptimal position of being | |
426 | * behind our local bridge segment: Snooping switches will directly | |
427 | * forward listener reports to the querier, therefore batman-adv and | |
428 | * the bridge will potentially not see these listeners - the querier is | |
429 | * potentially shadowing listeners from us then. | |
430 | * | |
431 | * This is only interesting for nodes with a bridge on top of their | |
432 | * soft interface. | |
433 | */ | |
434 | static void | |
435 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, | |
436 | struct batadv_mcast_querier_state *old_state, | |
437 | struct batadv_mcast_querier_state *new_state) | |
438 | { | |
439 | if (!old_state->exists && new_state->exists) | |
440 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", | |
441 | str_proto); | |
442 | else if (old_state->exists && !new_state->exists) | |
443 | batadv_info(bat_priv->soft_iface, | |
444 | "%s Querier disappeared - multicast optimizations disabled\n", | |
445 | str_proto); | |
446 | else if (!bat_priv->mcast.bridged && !new_state->exists) | |
447 | batadv_info(bat_priv->soft_iface, | |
448 | "No %s Querier present - multicast optimizations disabled\n", | |
449 | str_proto); | |
450 | ||
451 | if (new_state->exists) { | |
452 | if ((!old_state->shadowing && new_state->shadowing) || | |
453 | (!old_state->exists && new_state->shadowing)) | |
454 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
455 | "%s Querier is behind our bridged segment: Might shadow listeners\n", | |
456 | str_proto); | |
457 | else if (old_state->shadowing && !new_state->shadowing) | |
458 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
459 | "%s Querier is not behind our bridged segment\n", | |
460 | str_proto); | |
461 | } | |
462 | } | |
463 | ||
464 | /** | |
7e9a8c2c SE |
465 | * batadv_mcast_bridge_log() - debug output for topology changes in bridged |
466 | * setups | |
72f7b2de LL |
467 | * @bat_priv: the bat priv with all the soft interface information |
468 | * @bridged: a flag about whether the soft interface is currently bridged or not | |
469 | * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier | |
470 | * @querier_ipv6: (maybe) new status of a potential, selected MLD querier | |
471 | * | |
472 | * If no bridges are ever used on this node, then this function does nothing. | |
473 | * | |
474 | * Otherwise this function outputs debug information to the 'mcast' log level | |
475 | * which might be relevant to our multicast optimizations. | |
476 | * | |
477 | * More precisely, it outputs information when a bridge interface is added or | |
478 | * removed from a soft interface. And when a bridge is present, it further | |
479 | * outputs information about the querier state which is relevant for the | |
480 | * multicast flags this node is going to set. | |
481 | */ | |
482 | static void | |
483 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged, | |
484 | struct batadv_mcast_querier_state *querier_ipv4, | |
485 | struct batadv_mcast_querier_state *querier_ipv6) | |
486 | { | |
487 | if (!bat_priv->mcast.bridged && bridged) | |
488 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
489 | "Bridge added: Setting Unsnoopables(U)-flag\n"); | |
490 | else if (bat_priv->mcast.bridged && !bridged) | |
491 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
492 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); | |
493 | ||
494 | if (bridged) { | |
495 | batadv_mcast_querier_log(bat_priv, "IGMP", | |
496 | &bat_priv->mcast.querier_ipv4, | |
497 | querier_ipv4); | |
498 | batadv_mcast_querier_log(bat_priv, "MLD", | |
499 | &bat_priv->mcast.querier_ipv6, | |
500 | querier_ipv6); | |
501 | } | |
502 | } | |
503 | ||
504 | /** | |
7e9a8c2c | 505 | * batadv_mcast_flags_logs() - output debug information about mcast flag changes |
72f7b2de LL |
506 | * @bat_priv: the bat priv with all the soft interface information |
507 | * @flags: flags indicating the new multicast state | |
508 | * | |
509 | * Whenever the multicast flags this nodes announces changes (@mcast_flags vs. | |
510 | * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level. | |
511 | */ | |
512 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) | |
513 | { | |
514 | u8 old_flags = bat_priv->mcast.flags; | |
515 | char str_old_flags[] = "[...]"; | |
516 | ||
517 | sprintf(str_old_flags, "[%c%c%c]", | |
518 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
519 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
520 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
521 | ||
522 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
523 | "Changing multicast flags from '%s' to '[%c%c%c]'\n", | |
524 | bat_priv->mcast.enabled ? str_old_flags : "<undefined>", | |
525 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
526 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
527 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
528 | } | |
529 | ||
60432d75 | 530 | /** |
7e9a8c2c | 531 | * batadv_mcast_mla_tvlv_update() - update multicast tvlv |
60432d75 LL |
532 | * @bat_priv: the bat priv with all the soft interface information |
533 | * | |
534 | * Updates the own multicast tvlv with our current multicast related settings, | |
535 | * capabilities and inabilities. | |
536 | * | |
687937ab LL |
537 | * Return: false if we want all IPv4 && IPv6 multicast traffic and true |
538 | * otherwise. | |
60432d75 LL |
539 | */ |
540 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
541 | { | |
542 | struct batadv_tvlv_mcast_data mcast_data; | |
687937ab LL |
543 | struct batadv_mcast_querier_state querier4 = {false, false}; |
544 | struct batadv_mcast_querier_state querier6 = {false, false}; | |
545 | struct net_device *dev = bat_priv->soft_iface; | |
72f7b2de | 546 | bool bridged; |
60432d75 LL |
547 | |
548 | mcast_data.flags = BATADV_NO_FLAGS; | |
549 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
550 | ||
72f7b2de LL |
551 | bridged = batadv_mcast_has_bridge(bat_priv); |
552 | if (!bridged) | |
687937ab LL |
553 | goto update; |
554 | ||
c1bacea0 SE |
555 | if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) |
556 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
687937ab LL |
557 | |
558 | querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
559 | querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
560 | ||
561 | querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
562 | querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
563 | ||
564 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
565 | ||
566 | /* 1) If no querier exists at all, then multicast listeners on | |
567 | * our local TT clients behind the bridge will keep silent. | |
568 | * 2) If the selected querier is on one of our local TT clients, | |
569 | * behind the bridge, then this querier might shadow multicast | |
570 | * listeners on our local TT clients, behind this bridge. | |
571 | * | |
572 | * In both cases, we will signalize other batman nodes that | |
573 | * we need all multicast traffic of the according protocol. | |
60432d75 | 574 | */ |
687937ab LL |
575 | if (!querier4.exists || querier4.shadowing) |
576 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
60432d75 | 577 | |
687937ab LL |
578 | if (!querier6.exists || querier6.shadowing) |
579 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
60432d75 | 580 | |
687937ab | 581 | update: |
72f7b2de LL |
582 | batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6); |
583 | ||
584 | bat_priv->mcast.querier_ipv4.exists = querier4.exists; | |
585 | bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing; | |
586 | ||
587 | bat_priv->mcast.querier_ipv6.exists = querier6.exists; | |
588 | bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing; | |
589 | ||
590 | bat_priv->mcast.bridged = bridged; | |
591 | ||
60432d75 LL |
592 | if (!bat_priv->mcast.enabled || |
593 | mcast_data.flags != bat_priv->mcast.flags) { | |
72f7b2de | 594 | batadv_mcast_flags_log(bat_priv, mcast_data.flags); |
bd2a979e | 595 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
60432d75 LL |
596 | &mcast_data, sizeof(mcast_data)); |
597 | bat_priv->mcast.flags = mcast_data.flags; | |
598 | bat_priv->mcast.enabled = true; | |
599 | } | |
600 | ||
74c12c63 LL |
601 | return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && |
602 | mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); | |
60432d75 LL |
603 | } |
604 | ||
c5caf4ef | 605 | /** |
7e9a8c2c | 606 | * __batadv_mcast_mla_update() - update the own MLAs |
c5caf4ef LL |
607 | * @bat_priv: the bat priv with all the soft interface information |
608 | * | |
60432d75 LL |
609 | * Updates the own multicast listener announcements in the translation |
610 | * table as well as the own, announced multicast tvlv container. | |
cbebd363 LL |
611 | * |
612 | * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list | |
613 | * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are | |
614 | * ensured by the non-parallel execution of the worker this function | |
615 | * belongs to. | |
c5caf4ef | 616 | */ |
cbebd363 | 617 | static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) |
c5caf4ef LL |
618 | { |
619 | struct net_device *soft_iface = bat_priv->soft_iface; | |
620 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
621 | int ret; | |
622 | ||
60432d75 | 623 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
624 | goto update; |
625 | ||
6b253603 | 626 | ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list); |
c5caf4ef LL |
627 | if (ret < 0) |
628 | goto out; | |
629 | ||
6b253603 | 630 | ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list); |
687937ab LL |
631 | if (ret < 0) |
632 | goto out; | |
633 | ||
c5caf4ef LL |
634 | update: |
635 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
636 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
637 | ||
638 | out: | |
b7769763 | 639 | batadv_mcast_mla_list_free(&mcast_list); |
c5caf4ef LL |
640 | } |
641 | ||
cbebd363 | 642 | /** |
7e9a8c2c | 643 | * batadv_mcast_mla_update() - update the own MLAs |
cbebd363 LL |
644 | * @work: kernel work struct |
645 | * | |
646 | * Updates the own multicast listener announcements in the translation | |
647 | * table as well as the own, announced multicast tvlv container. | |
648 | * | |
649 | * In the end, reschedules the work timer. | |
650 | */ | |
651 | static void batadv_mcast_mla_update(struct work_struct *work) | |
652 | { | |
653 | struct delayed_work *delayed_work; | |
654 | struct batadv_priv_mcast *priv_mcast; | |
655 | struct batadv_priv *bat_priv; | |
656 | ||
657 | delayed_work = to_delayed_work(work); | |
658 | priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); | |
659 | bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); | |
660 | ||
661 | __batadv_mcast_mla_update(bat_priv); | |
662 | batadv_mcast_start_timer(bat_priv); | |
663 | } | |
664 | ||
bd2a979e | 665 | /** |
7e9a8c2c | 666 | * batadv_mcast_is_report_ipv4() - check for IGMP reports |
bd2a979e LL |
667 | * @skb: the ethernet frame destined for the mesh |
668 | * | |
669 | * This call might reallocate skb data. | |
670 | * | |
671 | * Checks whether the given frame is a valid IGMP report. | |
672 | * | |
673 | * Return: If so then true, otherwise false. | |
674 | */ | |
675 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
676 | { | |
677 | if (ip_mc_check_igmp(skb, NULL) < 0) | |
678 | return false; | |
679 | ||
680 | switch (igmp_hdr(skb)->type) { | |
681 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
682 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
683 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
684 | return true; | |
685 | } | |
686 | ||
687 | return false; | |
688 | } | |
689 | ||
ab49886e | 690 | /** |
7e9a8c2c SE |
691 | * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding |
692 | * potential | |
ab49886e LL |
693 | * @bat_priv: the bat priv with all the soft interface information |
694 | * @skb: the IPv4 packet to check | |
695 | * @is_unsnoopable: stores whether the destination is snoopable | |
696 | * | |
697 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
698 | * mode more optimal than classic flooding. | |
699 | * | |
62fe710f SE |
700 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
701 | * allocation failure. | |
ab49886e LL |
702 | */ |
703 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
704 | struct sk_buff *skb, | |
705 | bool *is_unsnoopable) | |
706 | { | |
707 | struct iphdr *iphdr; | |
708 | ||
709 | /* We might fail due to out-of-memory -> drop it */ | |
710 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
711 | return -ENOMEM; | |
712 | ||
bd2a979e LL |
713 | if (batadv_mcast_is_report_ipv4(skb)) |
714 | return -EINVAL; | |
715 | ||
ab49886e LL |
716 | iphdr = ip_hdr(skb); |
717 | ||
718 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
719 | * then allow scope > link local, too | |
720 | */ | |
721 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
722 | return -EINVAL; | |
723 | ||
724 | /* link-local multicast listeners behind a bridge are | |
725 | * not snoopable (see RFC4541, section 2.1.2.2) | |
726 | */ | |
727 | *is_unsnoopable = true; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
bd2a979e | 732 | /** |
7e9a8c2c | 733 | * batadv_mcast_is_report_ipv6() - check for MLD reports |
bd2a979e LL |
734 | * @skb: the ethernet frame destined for the mesh |
735 | * | |
736 | * This call might reallocate skb data. | |
737 | * | |
738 | * Checks whether the given frame is a valid MLD report. | |
739 | * | |
740 | * Return: If so then true, otherwise false. | |
741 | */ | |
742 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
743 | { | |
744 | if (ipv6_mc_check_mld(skb, NULL) < 0) | |
745 | return false; | |
746 | ||
747 | switch (icmp6_hdr(skb)->icmp6_type) { | |
748 | case ICMPV6_MGM_REPORT: | |
749 | case ICMPV6_MLD2_REPORT: | |
750 | return true; | |
751 | } | |
752 | ||
753 | return false; | |
754 | } | |
755 | ||
1d8ab8d3 | 756 | /** |
7e9a8c2c SE |
757 | * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding |
758 | * potential | |
1d8ab8d3 LL |
759 | * @bat_priv: the bat priv with all the soft interface information |
760 | * @skb: the IPv6 packet to check | |
ab49886e | 761 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
762 | * |
763 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
764 | * mode more optimal than classic flooding. | |
765 | * | |
62fe710f | 766 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
767 | */ |
768 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
769 | struct sk_buff *skb, |
770 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
771 | { |
772 | struct ipv6hdr *ip6hdr; | |
773 | ||
774 | /* We might fail due to out-of-memory -> drop it */ | |
775 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
776 | return -ENOMEM; | |
777 | ||
bd2a979e LL |
778 | if (batadv_mcast_is_report_ipv6(skb)) |
779 | return -EINVAL; | |
780 | ||
1d8ab8d3 LL |
781 | ip6hdr = ipv6_hdr(skb); |
782 | ||
783 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
784 | * then allow scope > link local, too | |
785 | */ | |
786 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
787 | return -EINVAL; | |
788 | ||
789 | /* link-local-all-nodes multicast listeners behind a bridge are | |
790 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
791 | */ | |
792 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 793 | *is_unsnoopable = true; |
1d8ab8d3 LL |
794 | |
795 | return 0; | |
796 | } | |
797 | ||
798 | /** | |
7e9a8c2c | 799 | * batadv_mcast_forw_mode_check() - check for optimized forwarding potential |
1d8ab8d3 LL |
800 | * @bat_priv: the bat priv with all the soft interface information |
801 | * @skb: the multicast frame to check | |
ab49886e | 802 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
803 | * |
804 | * Checks whether the given multicast ethernet frame has the potential to be | |
805 | * forwarded with a mode more optimal than classic flooding. | |
806 | * | |
62fe710f | 807 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
808 | */ |
809 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
810 | struct sk_buff *skb, |
811 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
812 | { |
813 | struct ethhdr *ethhdr = eth_hdr(skb); | |
814 | ||
815 | if (!atomic_read(&bat_priv->multicast_mode)) | |
816 | return -EINVAL; | |
817 | ||
818 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
819 | return -EINVAL; | |
820 | ||
821 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
822 | case ETH_P_IP: |
823 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
824 | is_unsnoopable); | |
1d8ab8d3 | 825 | case ETH_P_IPV6: |
c1bacea0 SE |
826 | if (!IS_ENABLED(CONFIG_IPV6)) |
827 | return -EINVAL; | |
828 | ||
ab49886e LL |
829 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
830 | is_unsnoopable); | |
1d8ab8d3 LL |
831 | default: |
832 | return -EINVAL; | |
833 | } | |
834 | } | |
835 | ||
4c8755d6 | 836 | /** |
7e9a8c2c | 837 | * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast |
6d030de8 | 838 | * interest |
4c8755d6 LL |
839 | * @bat_priv: the bat priv with all the soft interface information |
840 | * @ethhdr: ethernet header of a packet | |
841 | * | |
62fe710f | 842 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
843 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
844 | * IPv6 traffic if it matches an IPv6 packet. | |
845 | */ | |
846 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
847 | struct ethhdr *ethhdr) | |
848 | { | |
849 | switch (ntohs(ethhdr->h_proto)) { | |
850 | case ETH_P_IP: | |
851 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
852 | case ETH_P_IPV6: | |
853 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
854 | default: | |
855 | /* we shouldn't be here... */ | |
856 | return 0; | |
857 | } | |
858 | } | |
859 | ||
1d8ab8d3 | 860 | /** |
7e9a8c2c | 861 | * batadv_mcast_forw_tt_node_get() - get a multicast tt node |
1d8ab8d3 LL |
862 | * @bat_priv: the bat priv with all the soft interface information |
863 | * @ethhdr: the ether header containing the multicast destination | |
864 | * | |
62fe710f | 865 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
866 | * via a translation table lookup. This increases the returned nodes refcount. |
867 | */ | |
868 | static struct batadv_orig_node * | |
869 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
870 | struct ethhdr *ethhdr) | |
871 | { | |
f8fb3419 LL |
872 | return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest, |
873 | BATADV_NO_FLAGS); | |
1d8ab8d3 LL |
874 | } |
875 | ||
4c8755d6 | 876 | /** |
7e9a8c2c | 877 | * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag |
4c8755d6 LL |
878 | * @bat_priv: the bat priv with all the soft interface information |
879 | * | |
62fe710f | 880 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
881 | * increases its refcount. |
882 | */ | |
883 | static struct batadv_orig_node * | |
884 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
885 | { | |
886 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
887 | ||
888 | rcu_read_lock(); | |
889 | hlist_for_each_entry_rcu(tmp_orig_node, | |
890 | &bat_priv->mcast.want_all_ipv4_list, | |
891 | mcast_want_all_ipv4_node) { | |
7c124391 | 892 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
893 | continue; |
894 | ||
895 | orig_node = tmp_orig_node; | |
896 | break; | |
897 | } | |
898 | rcu_read_unlock(); | |
899 | ||
900 | return orig_node; | |
901 | } | |
902 | ||
903 | /** | |
7e9a8c2c | 904 | * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag |
4c8755d6 LL |
905 | * @bat_priv: the bat priv with all the soft interface information |
906 | * | |
62fe710f | 907 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
908 | * and increases its refcount. |
909 | */ | |
910 | static struct batadv_orig_node * | |
911 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
912 | { | |
913 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
914 | ||
915 | rcu_read_lock(); | |
916 | hlist_for_each_entry_rcu(tmp_orig_node, | |
917 | &bat_priv->mcast.want_all_ipv6_list, | |
918 | mcast_want_all_ipv6_node) { | |
7c124391 | 919 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
920 | continue; |
921 | ||
922 | orig_node = tmp_orig_node; | |
923 | break; | |
924 | } | |
925 | rcu_read_unlock(); | |
926 | ||
927 | return orig_node; | |
928 | } | |
929 | ||
930 | /** | |
7e9a8c2c | 931 | * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
932 | * @bat_priv: the bat priv with all the soft interface information |
933 | * @ethhdr: an ethernet header to determine the protocol family from | |
934 | * | |
62fe710f | 935 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
936 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
937 | * increases its refcount. | |
938 | */ | |
939 | static struct batadv_orig_node * | |
940 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
941 | struct ethhdr *ethhdr) | |
942 | { | |
943 | switch (ntohs(ethhdr->h_proto)) { | |
944 | case ETH_P_IP: | |
945 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
946 | case ETH_P_IPV6: | |
947 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
948 | default: | |
949 | /* we shouldn't be here... */ | |
950 | return NULL; | |
951 | } | |
952 | } | |
953 | ||
ab49886e | 954 | /** |
7e9a8c2c | 955 | * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag |
ab49886e LL |
956 | * @bat_priv: the bat priv with all the soft interface information |
957 | * | |
62fe710f | 958 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
959 | * set and increases its refcount. |
960 | */ | |
961 | static struct batadv_orig_node * | |
962 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
963 | { | |
964 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
965 | ||
966 | rcu_read_lock(); | |
967 | hlist_for_each_entry_rcu(tmp_orig_node, | |
968 | &bat_priv->mcast.want_all_unsnoopables_list, | |
969 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 970 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
971 | continue; |
972 | ||
973 | orig_node = tmp_orig_node; | |
974 | break; | |
975 | } | |
976 | rcu_read_unlock(); | |
977 | ||
978 | return orig_node; | |
979 | } | |
980 | ||
1d8ab8d3 | 981 | /** |
7e9a8c2c | 982 | * batadv_mcast_forw_mode() - check on how to forward a multicast packet |
1d8ab8d3 LL |
983 | * @bat_priv: the bat priv with all the soft interface information |
984 | * @skb: The multicast packet to check | |
985 | * @orig: an originator to be set to forward the skb to | |
986 | * | |
62fe710f | 987 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
988 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
989 | * should be forwarded to. | |
990 | */ | |
991 | enum batadv_forw_mode | |
992 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
993 | struct batadv_orig_node **orig) | |
994 | { | |
4c8755d6 | 995 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 996 | bool is_unsnoopable = false; |
1d8ab8d3 | 997 | struct ethhdr *ethhdr; |
1d8ab8d3 | 998 | |
ab49886e | 999 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
1000 | if (ret == -ENOMEM) |
1001 | return BATADV_FORW_NONE; | |
1002 | else if (ret < 0) | |
1003 | return BATADV_FORW_ALL; | |
1004 | ||
1005 | ethhdr = eth_hdr(skb); | |
1006 | ||
1007 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
1008 | BATADV_NO_FLAGS); | |
4c8755d6 | 1009 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
1010 | unsnoop_count = !is_unsnoopable ? 0 : |
1011 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
1012 | ||
4c8755d6 | 1013 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 1014 | |
ab49886e | 1015 | switch (total_count) { |
1d8ab8d3 | 1016 | case 1: |
ab49886e LL |
1017 | if (tt_count) |
1018 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
1019 | else if (ip_count) |
1020 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
1021 | else if (unsnoop_count) |
1022 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
1023 | ||
1d8ab8d3 LL |
1024 | if (*orig) |
1025 | return BATADV_FORW_SINGLE; | |
1026 | ||
1027 | /* fall through */ | |
1028 | case 0: | |
1029 | return BATADV_FORW_NONE; | |
1030 | default: | |
1031 | return BATADV_FORW_ALL; | |
1032 | } | |
1033 | } | |
1034 | ||
ab49886e | 1035 | /** |
7e9a8c2c | 1036 | * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list |
ab49886e LL |
1037 | * @bat_priv: the bat priv with all the soft interface information |
1038 | * @orig: the orig_node which multicast state might have changed of | |
1039 | * @mcast_flags: flags indicating the new multicast state | |
1040 | * | |
1041 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
1042 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1043 | * |
1044 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
1045 | */ |
1046 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
1047 | struct batadv_orig_node *orig, | |
6b5e971a | 1048 | u8 mcast_flags) |
ab49886e | 1049 | { |
8a4023c5 LL |
1050 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
1051 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
1052 | ||
5274cd68 SE |
1053 | lockdep_assert_held(&orig->mcast_handler_lock); |
1054 | ||
ab49886e LL |
1055 | /* switched from flag unset to set */ |
1056 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
1057 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
1058 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
1059 | ||
1060 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1061 | /* flag checks above + mcast_handler_lock prevents this */ |
1062 | WARN_ON(!hlist_unhashed(node)); | |
1063 | ||
1064 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
1065 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1066 | /* switched from flag set to unset */ | |
1067 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
1068 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
1069 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
1070 | ||
1071 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1072 | /* flag checks above + mcast_handler_lock prevents this */ |
1073 | WARN_ON(hlist_unhashed(node)); | |
1074 | ||
1075 | hlist_del_init_rcu(node); | |
ab49886e LL |
1076 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1077 | } | |
1078 | } | |
1079 | ||
4c8755d6 | 1080 | /** |
7e9a8c2c | 1081 | * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list |
4c8755d6 LL |
1082 | * @bat_priv: the bat priv with all the soft interface information |
1083 | * @orig: the orig_node which multicast state might have changed of | |
1084 | * @mcast_flags: flags indicating the new multicast state | |
1085 | * | |
1086 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
1087 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1088 | * |
1089 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1090 | */ |
1091 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
1092 | struct batadv_orig_node *orig, | |
6b5e971a | 1093 | u8 mcast_flags) |
4c8755d6 | 1094 | { |
8a4023c5 LL |
1095 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
1096 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
1097 | ||
5274cd68 SE |
1098 | lockdep_assert_held(&orig->mcast_handler_lock); |
1099 | ||
4c8755d6 LL |
1100 | /* switched from flag unset to set */ |
1101 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
1102 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
1103 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
1104 | ||
1105 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1106 | /* flag checks above + mcast_handler_lock prevents this */ |
1107 | WARN_ON(!hlist_unhashed(node)); | |
1108 | ||
1109 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1110 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1111 | /* switched from flag set to unset */ | |
1112 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
1113 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
1114 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
1115 | ||
1116 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1117 | /* flag checks above + mcast_handler_lock prevents this */ |
1118 | WARN_ON(hlist_unhashed(node)); | |
1119 | ||
1120 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1121 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /** | |
7e9a8c2c | 1126 | * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list |
4c8755d6 LL |
1127 | * @bat_priv: the bat priv with all the soft interface information |
1128 | * @orig: the orig_node which multicast state might have changed of | |
1129 | * @mcast_flags: flags indicating the new multicast state | |
1130 | * | |
1131 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
1132 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1133 | * |
1134 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1135 | */ |
1136 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
1137 | struct batadv_orig_node *orig, | |
6b5e971a | 1138 | u8 mcast_flags) |
4c8755d6 | 1139 | { |
8a4023c5 LL |
1140 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1141 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
1142 | ||
5274cd68 SE |
1143 | lockdep_assert_held(&orig->mcast_handler_lock); |
1144 | ||
4c8755d6 LL |
1145 | /* switched from flag unset to set */ |
1146 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
1147 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
1148 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
1149 | ||
1150 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1151 | /* flag checks above + mcast_handler_lock prevents this */ |
1152 | WARN_ON(!hlist_unhashed(node)); | |
1153 | ||
1154 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1155 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1156 | /* switched from flag set to unset */ | |
1157 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
1158 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
1159 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
1160 | ||
1161 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1162 | /* flag checks above + mcast_handler_lock prevents this */ |
1163 | WARN_ON(hlist_unhashed(node)); | |
1164 | ||
1165 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1166 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1167 | } | |
1168 | } | |
1169 | ||
60432d75 | 1170 | /** |
7e9a8c2c | 1171 | * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container |
60432d75 LL |
1172 | * @bat_priv: the bat priv with all the soft interface information |
1173 | * @orig: the orig_node of the ogm | |
1174 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
1175 | * @tvlv_value: tvlv buffer containing the multicast data | |
1176 | * @tvlv_value_len: tvlv buffer length | |
1177 | */ | |
bd2a979e LL |
1178 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
1179 | struct batadv_orig_node *orig, | |
1180 | u8 flags, | |
1181 | void *tvlv_value, | |
1182 | u16 tvlv_value_len) | |
60432d75 LL |
1183 | { |
1184 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 1185 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
1186 | bool orig_initialized; |
1187 | ||
8a4023c5 | 1188 | if (orig_mcast_enabled && tvlv_value && |
825ffe1f | 1189 | tvlv_value_len >= sizeof(mcast_flags)) |
6b5e971a | 1190 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
1191 | |
1192 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
1193 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
1194 | &orig->capa_initialized); | |
60432d75 LL |
1195 | |
1196 | /* If mcast support is turned on decrease the disabled mcast node | |
1197 | * counter only if we had increased it for this node before. If this | |
1198 | * is a completely new orig_node no need to decrease the counter. | |
1199 | */ | |
1200 | if (orig_mcast_enabled && | |
9c936e3f | 1201 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
1202 | if (orig_initialized) |
1203 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 1204 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
1205 | /* If mcast support is being switched off or if this is an initial |
1206 | * OGM without mcast support then increase the disabled mcast | |
1207 | * node counter. | |
60432d75 LL |
1208 | */ |
1209 | } else if (!orig_mcast_enabled && | |
9c936e3f | 1210 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 1211 | !orig_initialized)) { |
60432d75 | 1212 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 1213 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
1214 | } |
1215 | ||
9c936e3f | 1216 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 1217 | |
ab49886e | 1218 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
1219 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
1220 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 1221 | |
60432d75 | 1222 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 1223 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
1224 | } |
1225 | ||
1226 | /** | |
7e9a8c2c | 1227 | * batadv_mcast_init() - initialize the multicast optimizations structures |
60432d75 LL |
1228 | * @bat_priv: the bat priv with all the soft interface information |
1229 | */ | |
1230 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
1231 | { | |
bd2a979e LL |
1232 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
1233 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 | 1234 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
cbebd363 LL |
1235 | |
1236 | INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); | |
1237 | batadv_mcast_start_timer(bat_priv); | |
60432d75 LL |
1238 | } |
1239 | ||
dc1cbd14 | 1240 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
4e3e823b | 1241 | /** |
7e9a8c2c | 1242 | * batadv_mcast_flags_print_header() - print own mcast flags to debugfs table |
4e3e823b LL |
1243 | * @bat_priv: the bat priv with all the soft interface information |
1244 | * @seq: debugfs table seq_file struct | |
1245 | * | |
1246 | * Prints our own multicast flags including a more specific reason why | |
1247 | * they are set, that is prints the bridge and querier state too, to | |
1248 | * the debugfs table specified via @seq. | |
1249 | */ | |
1250 | static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv, | |
1251 | struct seq_file *seq) | |
1252 | { | |
1253 | u8 flags = bat_priv->mcast.flags; | |
1254 | char querier4, querier6, shadowing4, shadowing6; | |
1255 | bool bridged = bat_priv->mcast.bridged; | |
1256 | ||
1257 | if (bridged) { | |
1258 | querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4'; | |
1259 | querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6'; | |
1260 | shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.'; | |
1261 | shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.'; | |
1262 | } else { | |
1263 | querier4 = '?'; | |
1264 | querier6 = '?'; | |
1265 | shadowing4 = '?'; | |
1266 | shadowing6 = '?'; | |
1267 | } | |
1268 | ||
1269 | seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n", | |
1270 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
1271 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
1272 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
1273 | seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.'); | |
1274 | seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n", | |
1275 | querier4, querier6); | |
1276 | seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n", | |
1277 | shadowing4, shadowing6); | |
1278 | seq_puts(seq, "-------------------------------------------\n"); | |
1279 | seq_printf(seq, " %-10s %s\n", "Originator", "Flags"); | |
1280 | } | |
1281 | ||
1282 | /** | |
7e9a8c2c | 1283 | * batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes |
4e3e823b LL |
1284 | * @seq: seq file to print on |
1285 | * @offset: not used | |
1286 | * | |
1287 | * This prints a table of (primary) originators and their according | |
1288 | * multicast flags, including (in the header) our own. | |
1289 | * | |
1290 | * Return: always 0 | |
1291 | */ | |
1292 | int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset) | |
1293 | { | |
1294 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1295 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1296 | struct batadv_hard_iface *primary_if; | |
1297 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1298 | struct batadv_orig_node *orig_node; | |
1299 | struct hlist_head *head; | |
1300 | u8 flags; | |
1301 | u32 i; | |
1302 | ||
1303 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1304 | if (!primary_if) | |
1305 | return 0; | |
1306 | ||
1307 | batadv_mcast_flags_print_header(bat_priv, seq); | |
1308 | ||
1309 | for (i = 0; i < hash->size; i++) { | |
1310 | head = &hash->table[i]; | |
1311 | ||
1312 | rcu_read_lock(); | |
1313 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1314 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1315 | &orig_node->capa_initialized)) | |
1316 | continue; | |
1317 | ||
1318 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1319 | &orig_node->capabilities)) { | |
1320 | seq_printf(seq, "%pM -\n", orig_node->orig); | |
1321 | continue; | |
1322 | } | |
1323 | ||
1324 | flags = orig_node->mcast_flags; | |
1325 | ||
1326 | seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig, | |
1327 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) | |
1328 | ? 'U' : '.', | |
1329 | (flags & BATADV_MCAST_WANT_ALL_IPV4) | |
1330 | ? '4' : '.', | |
1331 | (flags & BATADV_MCAST_WANT_ALL_IPV6) | |
1332 | ? '6' : '.'); | |
1333 | } | |
1334 | rcu_read_unlock(); | |
1335 | } | |
1336 | ||
1337 | batadv_hardif_put(primary_if); | |
1338 | ||
1339 | return 0; | |
1340 | } | |
dc1cbd14 | 1341 | #endif |
4e3e823b | 1342 | |
53dd9a68 LL |
1343 | /** |
1344 | * batadv_mcast_mesh_info_put() - put multicast info into a netlink message | |
1345 | * @msg: buffer for the message | |
1346 | * @bat_priv: the bat priv with all the soft interface information | |
1347 | * | |
1348 | * Return: 0 or error code. | |
1349 | */ | |
1350 | int batadv_mcast_mesh_info_put(struct sk_buff *msg, | |
1351 | struct batadv_priv *bat_priv) | |
1352 | { | |
1353 | u32 flags = bat_priv->mcast.flags; | |
1354 | u32 flags_priv = BATADV_NO_FLAGS; | |
1355 | ||
1356 | if (bat_priv->mcast.bridged) { | |
1357 | flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; | |
1358 | ||
1359 | if (bat_priv->mcast.querier_ipv4.exists) | |
1360 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; | |
1361 | if (bat_priv->mcast.querier_ipv6.exists) | |
1362 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; | |
1363 | if (bat_priv->mcast.querier_ipv4.shadowing) | |
1364 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; | |
1365 | if (bat_priv->mcast.querier_ipv6.shadowing) | |
1366 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; | |
1367 | } | |
1368 | ||
1369 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) || | |
1370 | nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv)) | |
1371 | return -EMSGSIZE; | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table | |
1378 | * to a netlink socket | |
1379 | * @msg: buffer for the message | |
1380 | * @portid: netlink port | |
1381 | * @seq: Sequence number of netlink message | |
1382 | * @orig_node: originator to dump the multicast flags of | |
1383 | * | |
1384 | * Return: 0 or error code. | |
1385 | */ | |
1386 | static int | |
1387 | batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
1388 | struct batadv_orig_node *orig_node) | |
1389 | { | |
1390 | void *hdr; | |
1391 | ||
1392 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
1393 | NLM_F_MULTI, BATADV_CMD_GET_MCAST_FLAGS); | |
1394 | if (!hdr) | |
1395 | return -ENOBUFS; | |
1396 | ||
1397 | if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, | |
1398 | orig_node->orig)) { | |
1399 | genlmsg_cancel(msg, hdr); | |
1400 | return -EMSGSIZE; | |
1401 | } | |
1402 | ||
1403 | if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1404 | &orig_node->capabilities)) { | |
1405 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, | |
1406 | orig_node->mcast_flags)) { | |
1407 | genlmsg_cancel(msg, hdr); | |
1408 | return -EMSGSIZE; | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | genlmsg_end(msg, hdr); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | /** | |
1417 | * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags | |
1418 | * table to a netlink socket | |
1419 | * @msg: buffer for the message | |
1420 | * @portid: netlink port | |
1421 | * @seq: Sequence number of netlink message | |
1422 | * @head: bucket to dump | |
1423 | * @idx_skip: How many entries to skip | |
1424 | * | |
1425 | * Return: 0 or error code. | |
1426 | */ | |
1427 | static int | |
1428 | batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
1429 | struct hlist_head *head, long *idx_skip) | |
1430 | { | |
1431 | struct batadv_orig_node *orig_node; | |
1432 | long idx = 0; | |
1433 | ||
1434 | rcu_read_lock(); | |
1435 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1436 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1437 | &orig_node->capa_initialized)) | |
1438 | continue; | |
1439 | ||
1440 | if (idx < *idx_skip) | |
1441 | goto skip; | |
1442 | ||
1443 | if (batadv_mcast_flags_dump_entry(msg, portid, seq, | |
1444 | orig_node)) { | |
1445 | rcu_read_unlock(); | |
1446 | *idx_skip = idx; | |
1447 | ||
1448 | return -EMSGSIZE; | |
1449 | } | |
1450 | ||
1451 | skip: | |
1452 | idx++; | |
1453 | } | |
1454 | rcu_read_unlock(); | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | /** | |
1460 | * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
1461 | * @msg: buffer for the message | |
1462 | * @portid: netlink port | |
1463 | * @seq: Sequence number of netlink message | |
1464 | * @bat_priv: the bat priv with all the soft interface information | |
1465 | * @bucket: current bucket to dump | |
1466 | * @idx: index in current bucket to the next entry to dump | |
1467 | * | |
1468 | * Return: 0 or error code. | |
1469 | */ | |
1470 | static int | |
1471 | __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, u32 seq, | |
1472 | struct batadv_priv *bat_priv, long *bucket, long *idx) | |
1473 | { | |
1474 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1475 | long bucket_tmp = *bucket; | |
1476 | struct hlist_head *head; | |
1477 | long idx_tmp = *idx; | |
1478 | ||
1479 | while (bucket_tmp < hash->size) { | |
1480 | head = &hash->table[bucket_tmp]; | |
1481 | ||
1482 | if (batadv_mcast_flags_dump_bucket(msg, portid, seq, head, | |
1483 | &idx_tmp)) | |
1484 | break; | |
1485 | ||
1486 | bucket_tmp++; | |
1487 | idx_tmp = 0; | |
1488 | } | |
1489 | ||
1490 | *bucket = bucket_tmp; | |
1491 | *idx = idx_tmp; | |
1492 | ||
1493 | return msg->len; | |
1494 | } | |
1495 | ||
1496 | /** | |
1497 | * batadv_mcast_netlink_get_primary() - get primary interface from netlink | |
1498 | * callback | |
1499 | * @cb: netlink callback structure | |
1500 | * @primary_if: the primary interface pointer to return the result in | |
1501 | * | |
1502 | * Return: 0 or error code. | |
1503 | */ | |
1504 | static int | |
1505 | batadv_mcast_netlink_get_primary(struct netlink_callback *cb, | |
1506 | struct batadv_hard_iface **primary_if) | |
1507 | { | |
1508 | struct batadv_hard_iface *hard_iface = NULL; | |
1509 | struct net *net = sock_net(cb->skb->sk); | |
1510 | struct net_device *soft_iface; | |
1511 | struct batadv_priv *bat_priv; | |
1512 | int ifindex; | |
1513 | int ret = 0; | |
1514 | ||
1515 | ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); | |
1516 | if (!ifindex) | |
1517 | return -EINVAL; | |
1518 | ||
1519 | soft_iface = dev_get_by_index(net, ifindex); | |
1520 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
1521 | ret = -ENODEV; | |
1522 | goto out; | |
1523 | } | |
1524 | ||
1525 | bat_priv = netdev_priv(soft_iface); | |
1526 | ||
1527 | hard_iface = batadv_primary_if_get_selected(bat_priv); | |
1528 | if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { | |
1529 | ret = -ENOENT; | |
1530 | goto out; | |
1531 | } | |
1532 | ||
1533 | out: | |
1534 | if (soft_iface) | |
1535 | dev_put(soft_iface); | |
1536 | ||
1537 | if (!ret && primary_if) | |
1538 | *primary_if = hard_iface; | |
1539 | else | |
1540 | batadv_hardif_put(hard_iface); | |
1541 | ||
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | /** | |
1546 | * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
1547 | * @msg: buffer for the message | |
1548 | * @cb: callback structure containing arguments | |
1549 | * | |
1550 | * Return: message length. | |
1551 | */ | |
1552 | int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
1553 | { | |
1554 | struct batadv_hard_iface *primary_if = NULL; | |
1555 | int portid = NETLINK_CB(cb->skb).portid; | |
1556 | struct batadv_priv *bat_priv; | |
1557 | long *bucket = &cb->args[0]; | |
1558 | long *idx = &cb->args[1]; | |
1559 | int ret; | |
1560 | ||
1561 | ret = batadv_mcast_netlink_get_primary(cb, &primary_if); | |
1562 | if (ret) | |
1563 | return ret; | |
1564 | ||
1565 | bat_priv = netdev_priv(primary_if->soft_iface); | |
1566 | ret = __batadv_mcast_flags_dump(msg, portid, cb->nlh->nlmsg_seq, | |
1567 | bat_priv, bucket, idx); | |
1568 | ||
1569 | batadv_hardif_put(primary_if); | |
1570 | return ret; | |
1571 | } | |
1572 | ||
c5caf4ef | 1573 | /** |
7e9a8c2c | 1574 | * batadv_mcast_free() - free the multicast optimizations structures |
c5caf4ef LL |
1575 | * @bat_priv: the bat priv with all the soft interface information |
1576 | */ | |
1577 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
1578 | { | |
cbebd363 LL |
1579 | cancel_delayed_work_sync(&bat_priv->mcast.work); |
1580 | ||
bd2a979e LL |
1581 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
1582 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 1583 | |
cbebd363 | 1584 | /* safely calling outside of worker, as worker was canceled above */ |
c5caf4ef LL |
1585 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
1586 | } | |
60432d75 LL |
1587 | |
1588 | /** | |
7e9a8c2c | 1589 | * batadv_mcast_purge_orig() - reset originator global mcast state modifications |
60432d75 LL |
1590 | * @orig: the originator which is going to get purged |
1591 | */ | |
1592 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
1593 | { | |
1594 | struct batadv_priv *bat_priv = orig->bat_priv; | |
1595 | ||
8a4023c5 LL |
1596 | spin_lock_bh(&orig->mcast_handler_lock); |
1597 | ||
9c936e3f LL |
1598 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
1599 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 1600 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
1601 | |
1602 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
1603 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
1604 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
1605 | |
1606 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 1607 | } |