Commit | Line | Data |
---|---|---|
7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7a79d717 | 2 | /* Copyright (C) 2014-2019 B.A.T.M.A.N. contributors: |
c5caf4ef LL |
3 | * |
4 | * Linus Lüssing | |
c5caf4ef LL |
5 | */ |
6 | ||
c5caf4ef | 7 | #include "multicast.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
10 | #include <linux/atomic.h> | |
9c936e3f | 11 | #include <linux/bitops.h> |
8a4023c5 | 12 | #include <linux/bug.h> |
1e2c2a4f SE |
13 | #include <linux/byteorder/generic.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/etherdevice.h> | |
b92b94ac | 16 | #include <linux/gfp.h> |
bd2a979e | 17 | #include <linux/icmpv6.h> |
687937ab | 18 | #include <linux/if_bridge.h> |
1e2c2a4f | 19 | #include <linux/if_ether.h> |
bd2a979e | 20 | #include <linux/igmp.h> |
1e2c2a4f | 21 | #include <linux/in.h> |
bd2a979e | 22 | #include <linux/in6.h> |
1e2c2a4f SE |
23 | #include <linux/ip.h> |
24 | #include <linux/ipv6.h> | |
cbebd363 | 25 | #include <linux/jiffies.h> |
72f7b2de | 26 | #include <linux/kernel.h> |
7c124391 | 27 | #include <linux/kref.h> |
1e2c2a4f | 28 | #include <linux/list.h> |
2c72d655 | 29 | #include <linux/lockdep.h> |
1e2c2a4f | 30 | #include <linux/netdevice.h> |
53dd9a68 | 31 | #include <linux/netlink.h> |
687937ab | 32 | #include <linux/printk.h> |
1e2c2a4f SE |
33 | #include <linux/rculist.h> |
34 | #include <linux/rcupdate.h> | |
4e3e823b | 35 | #include <linux/seq_file.h> |
1e2c2a4f SE |
36 | #include <linux/skbuff.h> |
37 | #include <linux/slab.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/stddef.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/types.h> | |
cbebd363 | 42 | #include <linux/workqueue.h> |
1e2c2a4f | 43 | #include <net/addrconf.h> |
53dd9a68 | 44 | #include <net/genetlink.h> |
687937ab LL |
45 | #include <net/if_inet6.h> |
46 | #include <net/ip.h> | |
1e2c2a4f | 47 | #include <net/ipv6.h> |
53dd9a68 LL |
48 | #include <net/netlink.h> |
49 | #include <net/sock.h> | |
fec149f5 | 50 | #include <uapi/linux/batadv_packet.h> |
53dd9a68 | 51 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f | 52 | |
4e3e823b LL |
53 | #include "hard-interface.h" |
54 | #include "hash.h" | |
ba412080 | 55 | #include "log.h" |
53dd9a68 LL |
56 | #include "netlink.h" |
57 | #include "soft-interface.h" | |
c5caf4ef | 58 | #include "translation-table.h" |
1f8dce49 | 59 | #include "tvlv.h" |
c5caf4ef | 60 | |
cbebd363 LL |
61 | static void batadv_mcast_mla_update(struct work_struct *work); |
62 | ||
63 | /** | |
7e9a8c2c | 64 | * batadv_mcast_start_timer() - schedule the multicast periodic worker |
cbebd363 LL |
65 | * @bat_priv: the bat priv with all the soft interface information |
66 | */ | |
67 | static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) | |
68 | { | |
69 | queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, | |
70 | msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); | |
71 | } | |
72 | ||
687937ab | 73 | /** |
7e9a8c2c | 74 | * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists |
687937ab LL |
75 | * @soft_iface: netdev struct of the mesh interface |
76 | * | |
77 | * If the given soft interface has a bridge on top then the refcount | |
78 | * of the according net device is increased. | |
79 | * | |
80 | * Return: NULL if no such bridge exists. Otherwise the net device of the | |
81 | * bridge. | |
82 | */ | |
83 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) | |
84 | { | |
85 | struct net_device *upper = soft_iface; | |
86 | ||
87 | rcu_read_lock(); | |
88 | do { | |
89 | upper = netdev_master_upper_dev_get_rcu(upper); | |
90 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
91 | ||
92 | if (upper) | |
93 | dev_hold(upper); | |
94 | rcu_read_unlock(); | |
95 | ||
96 | return upper; | |
97 | } | |
98 | ||
6b253603 LL |
99 | /** |
100 | * batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4 | |
101 | * @addr: the MAC address to check | |
102 | * | |
103 | * Return: True, if MAC address is one reserved for IPv4 multicast, false | |
104 | * otherwise. | |
105 | */ | |
106 | static bool batadv_mcast_addr_is_ipv4(const u8 *addr) | |
107 | { | |
108 | static const u8 prefix[] = {0x01, 0x00, 0x5E}; | |
109 | ||
110 | return memcmp(prefix, addr, sizeof(prefix)) == 0; | |
111 | } | |
112 | ||
113 | /** | |
114 | * batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6 | |
115 | * @addr: the MAC address to check | |
116 | * | |
117 | * Return: True, if MAC address is one reserved for IPv6 multicast, false | |
118 | * otherwise. | |
119 | */ | |
120 | static bool batadv_mcast_addr_is_ipv6(const u8 *addr) | |
121 | { | |
122 | static const u8 prefix[] = {0x33, 0x33}; | |
123 | ||
124 | return memcmp(prefix, addr, sizeof(prefix)) == 0; | |
125 | } | |
126 | ||
c5caf4ef | 127 | /** |
7e9a8c2c | 128 | * batadv_mcast_mla_softif_get() - get softif multicast listeners |
6b253603 | 129 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
130 | * @dev: the device to collect multicast addresses from |
131 | * @mcast_list: a list to put found addresses into | |
132 | * | |
687937ab LL |
133 | * Collects multicast addresses of multicast listeners residing |
134 | * on this kernel on the given soft interface, dev, in | |
135 | * the given mcast_list. In general, multicast listeners provided by | |
136 | * your multicast receiving applications run directly on this node. | |
137 | * | |
138 | * If there is a bridge interface on top of dev, collects from that one | |
139 | * instead. Just like with IP addresses and routes, multicast listeners | |
140 | * will(/should) register to the bridge interface instead of an | |
141 | * enslaved bat0. | |
c5caf4ef | 142 | * |
62fe710f | 143 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
144 | * items added to the mcast_list otherwise. |
145 | */ | |
6b253603 LL |
146 | static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv, |
147 | struct net_device *dev, | |
c5caf4ef LL |
148 | struct hlist_head *mcast_list) |
149 | { | |
6b253603 LL |
150 | bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; |
151 | bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; | |
687937ab | 152 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
c5caf4ef LL |
153 | struct netdev_hw_addr *mc_list_entry; |
154 | struct batadv_hw_addr *new; | |
155 | int ret = 0; | |
156 | ||
687937ab LL |
157 | netif_addr_lock_bh(bridge ? bridge : dev); |
158 | netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { | |
6b253603 LL |
159 | if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr)) |
160 | continue; | |
161 | ||
162 | if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr)) | |
163 | continue; | |
164 | ||
c5caf4ef LL |
165 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
166 | if (!new) { | |
167 | ret = -ENOMEM; | |
168 | break; | |
169 | } | |
170 | ||
171 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
172 | hlist_add_head(&new->list, mcast_list); | |
173 | ret++; | |
174 | } | |
687937ab LL |
175 | netif_addr_unlock_bh(bridge ? bridge : dev); |
176 | ||
177 | if (bridge) | |
178 | dev_put(bridge); | |
c5caf4ef LL |
179 | |
180 | return ret; | |
181 | } | |
182 | ||
183 | /** | |
7e9a8c2c | 184 | * batadv_mcast_mla_is_duplicate() - check whether an address is in a list |
c5caf4ef LL |
185 | * @mcast_addr: the multicast address to check |
186 | * @mcast_list: the list with multicast addresses to search in | |
187 | * | |
62fe710f | 188 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
189 | * Otherwise returns false. |
190 | */ | |
6b5e971a | 191 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
192 | struct hlist_head *mcast_list) |
193 | { | |
194 | struct batadv_hw_addr *mcast_entry; | |
195 | ||
196 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
197 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
198 | return true; | |
199 | ||
200 | return false; | |
201 | } | |
202 | ||
687937ab | 203 | /** |
7e9a8c2c | 204 | * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address |
687937ab LL |
205 | * @dst: destination to write to - a multicast MAC address |
206 | * @src: source to read from - a multicast IP address | |
207 | * | |
208 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
209 | * to its matching multicast MAC address and copies it into the given | |
210 | * destination buffer. | |
211 | * | |
212 | * Caller needs to make sure the destination buffer can hold | |
213 | * at least ETH_ALEN bytes. | |
214 | */ | |
215 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
216 | { | |
217 | if (src->proto == htons(ETH_P_IP)) | |
218 | ip_eth_mc_map(src->u.ip4, dst); | |
219 | #if IS_ENABLED(CONFIG_IPV6) | |
220 | else if (src->proto == htons(ETH_P_IPV6)) | |
221 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
222 | #endif | |
223 | else | |
224 | eth_zero_addr(dst); | |
225 | } | |
226 | ||
227 | /** | |
7e9a8c2c | 228 | * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners |
6b253603 | 229 | * @bat_priv: the bat priv with all the soft interface information |
687937ab LL |
230 | * @dev: a bridge slave whose bridge to collect multicast addresses from |
231 | * @mcast_list: a list to put found addresses into | |
232 | * | |
233 | * Collects multicast addresses of multicast listeners residing | |
234 | * on foreign, non-mesh devices which we gave access to our mesh via | |
235 | * a bridge on top of the given soft interface, dev, in the given | |
236 | * mcast_list. | |
237 | * | |
238 | * Return: -ENOMEM on memory allocation error or the number of | |
239 | * items added to the mcast_list otherwise. | |
240 | */ | |
6b253603 LL |
241 | static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv, |
242 | struct net_device *dev, | |
687937ab LL |
243 | struct hlist_head *mcast_list) |
244 | { | |
245 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
6b253603 LL |
246 | bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; |
247 | bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; | |
687937ab LL |
248 | struct br_ip_list *br_ip_entry, *tmp; |
249 | struct batadv_hw_addr *new; | |
250 | u8 mcast_addr[ETH_ALEN]; | |
251 | int ret; | |
252 | ||
253 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
254 | * snooping code of the Linux bridge already does that for us | |
255 | */ | |
256 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
257 | if (ret < 0) | |
258 | goto out; | |
259 | ||
260 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
6b253603 LL |
261 | if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP)) |
262 | continue; | |
263 | ||
264 | if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6)) | |
265 | continue; | |
266 | ||
687937ab LL |
267 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); |
268 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
269 | continue; | |
270 | ||
271 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
272 | if (!new) { | |
273 | ret = -ENOMEM; | |
274 | break; | |
275 | } | |
276 | ||
277 | ether_addr_copy(new->addr, mcast_addr); | |
278 | hlist_add_head(&new->list, mcast_list); | |
279 | } | |
280 | ||
281 | out: | |
282 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
283 | list_del(&br_ip_entry->list); | |
284 | kfree(br_ip_entry); | |
285 | } | |
286 | ||
287 | return ret; | |
288 | } | |
289 | ||
c5caf4ef | 290 | /** |
7e9a8c2c | 291 | * batadv_mcast_mla_list_free() - free a list of multicast addresses |
c5caf4ef LL |
292 | * @mcast_list: the list to free |
293 | * | |
294 | * Removes and frees all items in the given mcast_list. | |
295 | */ | |
b7769763 | 296 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) |
c5caf4ef LL |
297 | { |
298 | struct batadv_hw_addr *mcast_entry; | |
299 | struct hlist_node *tmp; | |
300 | ||
301 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
302 | hlist_del(&mcast_entry->list); | |
303 | kfree(mcast_entry); | |
304 | } | |
305 | } | |
306 | ||
307 | /** | |
7e9a8c2c | 308 | * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements |
c5caf4ef LL |
309 | * @bat_priv: the bat priv with all the soft interface information |
310 | * @mcast_list: a list of addresses which should _not_ be removed | |
311 | * | |
312 | * Retracts the announcement of any multicast listener from the | |
313 | * translation table except the ones listed in the given mcast_list. | |
314 | * | |
315 | * If mcast_list is NULL then all are retracted. | |
cbebd363 LL |
316 | * |
317 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
318 | */ |
319 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
320 | struct hlist_head *mcast_list) | |
321 | { | |
322 | struct batadv_hw_addr *mcast_entry; | |
323 | struct hlist_node *tmp; | |
324 | ||
cbebd363 | 325 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 326 | |
c5caf4ef LL |
327 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
328 | list) { | |
329 | if (mcast_list && | |
330 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
331 | mcast_list)) | |
332 | continue; | |
333 | ||
334 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
335 | BATADV_NO_FLAGS, | |
336 | "mcast TT outdated", false); | |
337 | ||
338 | hlist_del(&mcast_entry->list); | |
339 | kfree(mcast_entry); | |
340 | } | |
341 | } | |
342 | ||
343 | /** | |
7e9a8c2c | 344 | * batadv_mcast_mla_tt_add() - add multicast listener announcements |
c5caf4ef LL |
345 | * @bat_priv: the bat priv with all the soft interface information |
346 | * @mcast_list: a list of addresses which are going to get added | |
347 | * | |
348 | * Adds multicast listener announcements from the given mcast_list to the | |
349 | * translation table if they have not been added yet. | |
cbebd363 LL |
350 | * |
351 | * Do not call outside of the mcast worker! (or cancel mcast worker first) | |
c5caf4ef LL |
352 | */ |
353 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
354 | struct hlist_head *mcast_list) | |
355 | { | |
356 | struct batadv_hw_addr *mcast_entry; | |
357 | struct hlist_node *tmp; | |
358 | ||
cbebd363 | 359 | WARN_ON(delayed_work_pending(&bat_priv->mcast.work)); |
2c72d655 | 360 | |
c5caf4ef LL |
361 | if (!mcast_list) |
362 | return; | |
363 | ||
364 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
365 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
366 | &bat_priv->mcast.mla_list)) | |
367 | continue; | |
368 | ||
369 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
370 | mcast_entry->addr, BATADV_NO_FLAGS, | |
371 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
372 | continue; | |
373 | ||
374 | hlist_del(&mcast_entry->list); | |
375 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
376 | } | |
377 | } | |
378 | ||
379 | /** | |
7e9a8c2c | 380 | * batadv_mcast_has_bridge() - check whether the soft-iface is bridged |
c5caf4ef LL |
381 | * @bat_priv: the bat priv with all the soft interface information |
382 | * | |
62fe710f SE |
383 | * Checks whether there is a bridge on top of our soft interface. |
384 | * | |
385 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
386 | */ |
387 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
388 | { | |
389 | struct net_device *upper = bat_priv->soft_iface; | |
390 | ||
391 | rcu_read_lock(); | |
392 | do { | |
393 | upper = netdev_master_upper_dev_get_rcu(upper); | |
394 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
395 | rcu_read_unlock(); | |
396 | ||
397 | return upper; | |
398 | } | |
399 | ||
72f7b2de | 400 | /** |
7e9a8c2c SE |
401 | * batadv_mcast_querier_log() - debug output regarding the querier status on |
402 | * link | |
72f7b2de LL |
403 | * @bat_priv: the bat priv with all the soft interface information |
404 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") | |
405 | * @old_state: the previous querier state on our link | |
406 | * @new_state: the new querier state on our link | |
407 | * | |
408 | * Outputs debug messages to the logging facility with log level 'mcast' | |
409 | * regarding changes to the querier status on the link which are relevant | |
410 | * to our multicast optimizations. | |
411 | * | |
412 | * Usually this is about whether a querier appeared or vanished in | |
413 | * our mesh or whether the querier is in the suboptimal position of being | |
414 | * behind our local bridge segment: Snooping switches will directly | |
415 | * forward listener reports to the querier, therefore batman-adv and | |
416 | * the bridge will potentially not see these listeners - the querier is | |
417 | * potentially shadowing listeners from us then. | |
418 | * | |
419 | * This is only interesting for nodes with a bridge on top of their | |
420 | * soft interface. | |
421 | */ | |
422 | static void | |
423 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, | |
424 | struct batadv_mcast_querier_state *old_state, | |
425 | struct batadv_mcast_querier_state *new_state) | |
426 | { | |
427 | if (!old_state->exists && new_state->exists) | |
428 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", | |
429 | str_proto); | |
430 | else if (old_state->exists && !new_state->exists) | |
431 | batadv_info(bat_priv->soft_iface, | |
432 | "%s Querier disappeared - multicast optimizations disabled\n", | |
433 | str_proto); | |
434 | else if (!bat_priv->mcast.bridged && !new_state->exists) | |
435 | batadv_info(bat_priv->soft_iface, | |
436 | "No %s Querier present - multicast optimizations disabled\n", | |
437 | str_proto); | |
438 | ||
439 | if (new_state->exists) { | |
440 | if ((!old_state->shadowing && new_state->shadowing) || | |
441 | (!old_state->exists && new_state->shadowing)) | |
442 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
443 | "%s Querier is behind our bridged segment: Might shadow listeners\n", | |
444 | str_proto); | |
445 | else if (old_state->shadowing && !new_state->shadowing) | |
446 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
447 | "%s Querier is not behind our bridged segment\n", | |
448 | str_proto); | |
449 | } | |
450 | } | |
451 | ||
452 | /** | |
7e9a8c2c SE |
453 | * batadv_mcast_bridge_log() - debug output for topology changes in bridged |
454 | * setups | |
72f7b2de LL |
455 | * @bat_priv: the bat priv with all the soft interface information |
456 | * @bridged: a flag about whether the soft interface is currently bridged or not | |
457 | * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier | |
458 | * @querier_ipv6: (maybe) new status of a potential, selected MLD querier | |
459 | * | |
460 | * If no bridges are ever used on this node, then this function does nothing. | |
461 | * | |
462 | * Otherwise this function outputs debug information to the 'mcast' log level | |
463 | * which might be relevant to our multicast optimizations. | |
464 | * | |
465 | * More precisely, it outputs information when a bridge interface is added or | |
466 | * removed from a soft interface. And when a bridge is present, it further | |
467 | * outputs information about the querier state which is relevant for the | |
468 | * multicast flags this node is going to set. | |
469 | */ | |
470 | static void | |
471 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged, | |
472 | struct batadv_mcast_querier_state *querier_ipv4, | |
473 | struct batadv_mcast_querier_state *querier_ipv6) | |
474 | { | |
475 | if (!bat_priv->mcast.bridged && bridged) | |
476 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
477 | "Bridge added: Setting Unsnoopables(U)-flag\n"); | |
478 | else if (bat_priv->mcast.bridged && !bridged) | |
479 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
480 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); | |
481 | ||
482 | if (bridged) { | |
483 | batadv_mcast_querier_log(bat_priv, "IGMP", | |
484 | &bat_priv->mcast.querier_ipv4, | |
485 | querier_ipv4); | |
486 | batadv_mcast_querier_log(bat_priv, "MLD", | |
487 | &bat_priv->mcast.querier_ipv6, | |
488 | querier_ipv6); | |
489 | } | |
490 | } | |
491 | ||
492 | /** | |
7e9a8c2c | 493 | * batadv_mcast_flags_logs() - output debug information about mcast flag changes |
72f7b2de LL |
494 | * @bat_priv: the bat priv with all the soft interface information |
495 | * @flags: flags indicating the new multicast state | |
496 | * | |
497 | * Whenever the multicast flags this nodes announces changes (@mcast_flags vs. | |
498 | * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level. | |
499 | */ | |
500 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) | |
501 | { | |
502 | u8 old_flags = bat_priv->mcast.flags; | |
503 | char str_old_flags[] = "[...]"; | |
504 | ||
505 | sprintf(str_old_flags, "[%c%c%c]", | |
506 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
507 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
508 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
509 | ||
510 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
511 | "Changing multicast flags from '%s' to '[%c%c%c]'\n", | |
512 | bat_priv->mcast.enabled ? str_old_flags : "<undefined>", | |
513 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
514 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
515 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
516 | } | |
517 | ||
60432d75 | 518 | /** |
7e9a8c2c | 519 | * batadv_mcast_mla_tvlv_update() - update multicast tvlv |
60432d75 LL |
520 | * @bat_priv: the bat priv with all the soft interface information |
521 | * | |
522 | * Updates the own multicast tvlv with our current multicast related settings, | |
523 | * capabilities and inabilities. | |
524 | * | |
687937ab LL |
525 | * Return: false if we want all IPv4 && IPv6 multicast traffic and true |
526 | * otherwise. | |
60432d75 LL |
527 | */ |
528 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
529 | { | |
530 | struct batadv_tvlv_mcast_data mcast_data; | |
687937ab LL |
531 | struct batadv_mcast_querier_state querier4 = {false, false}; |
532 | struct batadv_mcast_querier_state querier6 = {false, false}; | |
533 | struct net_device *dev = bat_priv->soft_iface; | |
72f7b2de | 534 | bool bridged; |
60432d75 LL |
535 | |
536 | mcast_data.flags = BATADV_NO_FLAGS; | |
537 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
538 | ||
72f7b2de LL |
539 | bridged = batadv_mcast_has_bridge(bat_priv); |
540 | if (!bridged) | |
687937ab LL |
541 | goto update; |
542 | ||
c1bacea0 SE |
543 | if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) |
544 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
687937ab LL |
545 | |
546 | querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
547 | querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
548 | ||
549 | querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
550 | querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
551 | ||
552 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
553 | ||
554 | /* 1) If no querier exists at all, then multicast listeners on | |
555 | * our local TT clients behind the bridge will keep silent. | |
556 | * 2) If the selected querier is on one of our local TT clients, | |
557 | * behind the bridge, then this querier might shadow multicast | |
558 | * listeners on our local TT clients, behind this bridge. | |
559 | * | |
560 | * In both cases, we will signalize other batman nodes that | |
561 | * we need all multicast traffic of the according protocol. | |
60432d75 | 562 | */ |
687937ab LL |
563 | if (!querier4.exists || querier4.shadowing) |
564 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
60432d75 | 565 | |
687937ab LL |
566 | if (!querier6.exists || querier6.shadowing) |
567 | mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
60432d75 | 568 | |
687937ab | 569 | update: |
72f7b2de LL |
570 | batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6); |
571 | ||
572 | bat_priv->mcast.querier_ipv4.exists = querier4.exists; | |
573 | bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing; | |
574 | ||
575 | bat_priv->mcast.querier_ipv6.exists = querier6.exists; | |
576 | bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing; | |
577 | ||
578 | bat_priv->mcast.bridged = bridged; | |
579 | ||
60432d75 LL |
580 | if (!bat_priv->mcast.enabled || |
581 | mcast_data.flags != bat_priv->mcast.flags) { | |
72f7b2de | 582 | batadv_mcast_flags_log(bat_priv, mcast_data.flags); |
bd2a979e | 583 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
60432d75 LL |
584 | &mcast_data, sizeof(mcast_data)); |
585 | bat_priv->mcast.flags = mcast_data.flags; | |
586 | bat_priv->mcast.enabled = true; | |
587 | } | |
588 | ||
74c12c63 LL |
589 | return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && |
590 | mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); | |
60432d75 LL |
591 | } |
592 | ||
c5caf4ef | 593 | /** |
7e9a8c2c | 594 | * __batadv_mcast_mla_update() - update the own MLAs |
c5caf4ef LL |
595 | * @bat_priv: the bat priv with all the soft interface information |
596 | * | |
60432d75 LL |
597 | * Updates the own multicast listener announcements in the translation |
598 | * table as well as the own, announced multicast tvlv container. | |
cbebd363 LL |
599 | * |
600 | * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list | |
601 | * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are | |
602 | * ensured by the non-parallel execution of the worker this function | |
603 | * belongs to. | |
c5caf4ef | 604 | */ |
cbebd363 | 605 | static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) |
c5caf4ef LL |
606 | { |
607 | struct net_device *soft_iface = bat_priv->soft_iface; | |
608 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
609 | int ret; | |
610 | ||
60432d75 | 611 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
612 | goto update; |
613 | ||
6b253603 | 614 | ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list); |
c5caf4ef LL |
615 | if (ret < 0) |
616 | goto out; | |
617 | ||
6b253603 | 618 | ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list); |
687937ab LL |
619 | if (ret < 0) |
620 | goto out; | |
621 | ||
c5caf4ef LL |
622 | update: |
623 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
624 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
625 | ||
626 | out: | |
b7769763 | 627 | batadv_mcast_mla_list_free(&mcast_list); |
c5caf4ef LL |
628 | } |
629 | ||
cbebd363 | 630 | /** |
7e9a8c2c | 631 | * batadv_mcast_mla_update() - update the own MLAs |
cbebd363 LL |
632 | * @work: kernel work struct |
633 | * | |
634 | * Updates the own multicast listener announcements in the translation | |
635 | * table as well as the own, announced multicast tvlv container. | |
636 | * | |
637 | * In the end, reschedules the work timer. | |
638 | */ | |
639 | static void batadv_mcast_mla_update(struct work_struct *work) | |
640 | { | |
641 | struct delayed_work *delayed_work; | |
642 | struct batadv_priv_mcast *priv_mcast; | |
643 | struct batadv_priv *bat_priv; | |
644 | ||
645 | delayed_work = to_delayed_work(work); | |
646 | priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); | |
647 | bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); | |
648 | ||
649 | __batadv_mcast_mla_update(bat_priv); | |
650 | batadv_mcast_start_timer(bat_priv); | |
651 | } | |
652 | ||
bd2a979e | 653 | /** |
7e9a8c2c | 654 | * batadv_mcast_is_report_ipv4() - check for IGMP reports |
bd2a979e LL |
655 | * @skb: the ethernet frame destined for the mesh |
656 | * | |
657 | * This call might reallocate skb data. | |
658 | * | |
659 | * Checks whether the given frame is a valid IGMP report. | |
660 | * | |
661 | * Return: If so then true, otherwise false. | |
662 | */ | |
663 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
664 | { | |
ba5ea614 | 665 | if (ip_mc_check_igmp(skb) < 0) |
bd2a979e LL |
666 | return false; |
667 | ||
668 | switch (igmp_hdr(skb)->type) { | |
669 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
670 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
671 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
672 | return true; | |
673 | } | |
674 | ||
675 | return false; | |
676 | } | |
677 | ||
ab49886e | 678 | /** |
7e9a8c2c SE |
679 | * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding |
680 | * potential | |
ab49886e LL |
681 | * @bat_priv: the bat priv with all the soft interface information |
682 | * @skb: the IPv4 packet to check | |
683 | * @is_unsnoopable: stores whether the destination is snoopable | |
684 | * | |
685 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
686 | * mode more optimal than classic flooding. | |
687 | * | |
62fe710f SE |
688 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
689 | * allocation failure. | |
ab49886e LL |
690 | */ |
691 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
692 | struct sk_buff *skb, | |
693 | bool *is_unsnoopable) | |
694 | { | |
695 | struct iphdr *iphdr; | |
696 | ||
697 | /* We might fail due to out-of-memory -> drop it */ | |
698 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
699 | return -ENOMEM; | |
700 | ||
bd2a979e LL |
701 | if (batadv_mcast_is_report_ipv4(skb)) |
702 | return -EINVAL; | |
703 | ||
ab49886e LL |
704 | iphdr = ip_hdr(skb); |
705 | ||
706 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
707 | * then allow scope > link local, too | |
708 | */ | |
709 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
710 | return -EINVAL; | |
711 | ||
712 | /* link-local multicast listeners behind a bridge are | |
713 | * not snoopable (see RFC4541, section 2.1.2.2) | |
714 | */ | |
715 | *is_unsnoopable = true; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
bd2a979e | 720 | /** |
7e9a8c2c | 721 | * batadv_mcast_is_report_ipv6() - check for MLD reports |
bd2a979e LL |
722 | * @skb: the ethernet frame destined for the mesh |
723 | * | |
724 | * This call might reallocate skb data. | |
725 | * | |
726 | * Checks whether the given frame is a valid MLD report. | |
727 | * | |
728 | * Return: If so then true, otherwise false. | |
729 | */ | |
730 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
731 | { | |
ba5ea614 | 732 | if (ipv6_mc_check_mld(skb) < 0) |
bd2a979e LL |
733 | return false; |
734 | ||
735 | switch (icmp6_hdr(skb)->icmp6_type) { | |
736 | case ICMPV6_MGM_REPORT: | |
737 | case ICMPV6_MLD2_REPORT: | |
738 | return true; | |
739 | } | |
740 | ||
741 | return false; | |
742 | } | |
743 | ||
1d8ab8d3 | 744 | /** |
7e9a8c2c SE |
745 | * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding |
746 | * potential | |
1d8ab8d3 LL |
747 | * @bat_priv: the bat priv with all the soft interface information |
748 | * @skb: the IPv6 packet to check | |
ab49886e | 749 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
750 | * |
751 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
752 | * mode more optimal than classic flooding. | |
753 | * | |
62fe710f | 754 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
755 | */ |
756 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
757 | struct sk_buff *skb, |
758 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
759 | { |
760 | struct ipv6hdr *ip6hdr; | |
761 | ||
762 | /* We might fail due to out-of-memory -> drop it */ | |
763 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
764 | return -ENOMEM; | |
765 | ||
bd2a979e LL |
766 | if (batadv_mcast_is_report_ipv6(skb)) |
767 | return -EINVAL; | |
768 | ||
1d8ab8d3 LL |
769 | ip6hdr = ipv6_hdr(skb); |
770 | ||
771 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
772 | * then allow scope > link local, too | |
773 | */ | |
774 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
775 | return -EINVAL; | |
776 | ||
777 | /* link-local-all-nodes multicast listeners behind a bridge are | |
778 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
779 | */ | |
780 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 781 | *is_unsnoopable = true; |
1d8ab8d3 LL |
782 | |
783 | return 0; | |
784 | } | |
785 | ||
786 | /** | |
7e9a8c2c | 787 | * batadv_mcast_forw_mode_check() - check for optimized forwarding potential |
1d8ab8d3 LL |
788 | * @bat_priv: the bat priv with all the soft interface information |
789 | * @skb: the multicast frame to check | |
ab49886e | 790 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
791 | * |
792 | * Checks whether the given multicast ethernet frame has the potential to be | |
793 | * forwarded with a mode more optimal than classic flooding. | |
794 | * | |
62fe710f | 795 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
796 | */ |
797 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
798 | struct sk_buff *skb, |
799 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
800 | { |
801 | struct ethhdr *ethhdr = eth_hdr(skb); | |
802 | ||
803 | if (!atomic_read(&bat_priv->multicast_mode)) | |
804 | return -EINVAL; | |
805 | ||
1d8ab8d3 | 806 | switch (ntohs(ethhdr->h_proto)) { |
ab49886e LL |
807 | case ETH_P_IP: |
808 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
809 | is_unsnoopable); | |
1d8ab8d3 | 810 | case ETH_P_IPV6: |
c1bacea0 SE |
811 | if (!IS_ENABLED(CONFIG_IPV6)) |
812 | return -EINVAL; | |
813 | ||
ab49886e LL |
814 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
815 | is_unsnoopable); | |
1d8ab8d3 LL |
816 | default: |
817 | return -EINVAL; | |
818 | } | |
819 | } | |
820 | ||
4c8755d6 | 821 | /** |
7e9a8c2c | 822 | * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast |
6d030de8 | 823 | * interest |
4c8755d6 LL |
824 | * @bat_priv: the bat priv with all the soft interface information |
825 | * @ethhdr: ethernet header of a packet | |
826 | * | |
62fe710f | 827 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
828 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
829 | * IPv6 traffic if it matches an IPv6 packet. | |
830 | */ | |
831 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
832 | struct ethhdr *ethhdr) | |
833 | { | |
834 | switch (ntohs(ethhdr->h_proto)) { | |
835 | case ETH_P_IP: | |
836 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
837 | case ETH_P_IPV6: | |
838 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
839 | default: | |
840 | /* we shouldn't be here... */ | |
841 | return 0; | |
842 | } | |
843 | } | |
844 | ||
1d8ab8d3 | 845 | /** |
7e9a8c2c | 846 | * batadv_mcast_forw_tt_node_get() - get a multicast tt node |
1d8ab8d3 LL |
847 | * @bat_priv: the bat priv with all the soft interface information |
848 | * @ethhdr: the ether header containing the multicast destination | |
849 | * | |
62fe710f | 850 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
851 | * via a translation table lookup. This increases the returned nodes refcount. |
852 | */ | |
853 | static struct batadv_orig_node * | |
854 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
855 | struct ethhdr *ethhdr) | |
856 | { | |
f8fb3419 LL |
857 | return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest, |
858 | BATADV_NO_FLAGS); | |
1d8ab8d3 LL |
859 | } |
860 | ||
4c8755d6 | 861 | /** |
7e9a8c2c | 862 | * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag |
4c8755d6 LL |
863 | * @bat_priv: the bat priv with all the soft interface information |
864 | * | |
62fe710f | 865 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
866 | * increases its refcount. |
867 | */ | |
868 | static struct batadv_orig_node * | |
869 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
870 | { | |
871 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
872 | ||
873 | rcu_read_lock(); | |
874 | hlist_for_each_entry_rcu(tmp_orig_node, | |
875 | &bat_priv->mcast.want_all_ipv4_list, | |
876 | mcast_want_all_ipv4_node) { | |
7c124391 | 877 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
878 | continue; |
879 | ||
880 | orig_node = tmp_orig_node; | |
881 | break; | |
882 | } | |
883 | rcu_read_unlock(); | |
884 | ||
885 | return orig_node; | |
886 | } | |
887 | ||
888 | /** | |
7e9a8c2c | 889 | * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag |
4c8755d6 LL |
890 | * @bat_priv: the bat priv with all the soft interface information |
891 | * | |
62fe710f | 892 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
893 | * and increases its refcount. |
894 | */ | |
895 | static struct batadv_orig_node * | |
896 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
897 | { | |
898 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
899 | ||
900 | rcu_read_lock(); | |
901 | hlist_for_each_entry_rcu(tmp_orig_node, | |
902 | &bat_priv->mcast.want_all_ipv6_list, | |
903 | mcast_want_all_ipv6_node) { | |
7c124391 | 904 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
905 | continue; |
906 | ||
907 | orig_node = tmp_orig_node; | |
908 | break; | |
909 | } | |
910 | rcu_read_unlock(); | |
911 | ||
912 | return orig_node; | |
913 | } | |
914 | ||
915 | /** | |
7e9a8c2c | 916 | * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
917 | * @bat_priv: the bat priv with all the soft interface information |
918 | * @ethhdr: an ethernet header to determine the protocol family from | |
919 | * | |
62fe710f | 920 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
921 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
922 | * increases its refcount. | |
923 | */ | |
924 | static struct batadv_orig_node * | |
925 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
926 | struct ethhdr *ethhdr) | |
927 | { | |
928 | switch (ntohs(ethhdr->h_proto)) { | |
929 | case ETH_P_IP: | |
930 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
931 | case ETH_P_IPV6: | |
932 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
933 | default: | |
934 | /* we shouldn't be here... */ | |
935 | return NULL; | |
936 | } | |
937 | } | |
938 | ||
ab49886e | 939 | /** |
7e9a8c2c | 940 | * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag |
ab49886e LL |
941 | * @bat_priv: the bat priv with all the soft interface information |
942 | * | |
62fe710f | 943 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
944 | * set and increases its refcount. |
945 | */ | |
946 | static struct batadv_orig_node * | |
947 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
948 | { | |
949 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
950 | ||
951 | rcu_read_lock(); | |
952 | hlist_for_each_entry_rcu(tmp_orig_node, | |
953 | &bat_priv->mcast.want_all_unsnoopables_list, | |
954 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 955 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
956 | continue; |
957 | ||
958 | orig_node = tmp_orig_node; | |
959 | break; | |
960 | } | |
961 | rcu_read_unlock(); | |
962 | ||
963 | return orig_node; | |
964 | } | |
965 | ||
1d8ab8d3 | 966 | /** |
7e9a8c2c | 967 | * batadv_mcast_forw_mode() - check on how to forward a multicast packet |
1d8ab8d3 LL |
968 | * @bat_priv: the bat priv with all the soft interface information |
969 | * @skb: The multicast packet to check | |
970 | * @orig: an originator to be set to forward the skb to | |
971 | * | |
62fe710f | 972 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
973 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
974 | * should be forwarded to. | |
975 | */ | |
976 | enum batadv_forw_mode | |
977 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
978 | struct batadv_orig_node **orig) | |
979 | { | |
4c8755d6 | 980 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 981 | bool is_unsnoopable = false; |
1d8ab8d3 | 982 | struct ethhdr *ethhdr; |
1d8ab8d3 | 983 | |
ab49886e | 984 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
985 | if (ret == -ENOMEM) |
986 | return BATADV_FORW_NONE; | |
987 | else if (ret < 0) | |
988 | return BATADV_FORW_ALL; | |
989 | ||
990 | ethhdr = eth_hdr(skb); | |
991 | ||
992 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
993 | BATADV_NO_FLAGS); | |
4c8755d6 | 994 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
995 | unsnoop_count = !is_unsnoopable ? 0 : |
996 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
997 | ||
4c8755d6 | 998 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 999 | |
ab49886e | 1000 | switch (total_count) { |
1d8ab8d3 | 1001 | case 1: |
ab49886e LL |
1002 | if (tt_count) |
1003 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
1004 | else if (ip_count) |
1005 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
1006 | else if (unsnoop_count) |
1007 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
1008 | ||
1d8ab8d3 LL |
1009 | if (*orig) |
1010 | return BATADV_FORW_SINGLE; | |
1011 | ||
1012 | /* fall through */ | |
1013 | case 0: | |
1014 | return BATADV_FORW_NONE; | |
1015 | default: | |
1016 | return BATADV_FORW_ALL; | |
1017 | } | |
1018 | } | |
1019 | ||
ab49886e | 1020 | /** |
7e9a8c2c | 1021 | * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list |
ab49886e LL |
1022 | * @bat_priv: the bat priv with all the soft interface information |
1023 | * @orig: the orig_node which multicast state might have changed of | |
1024 | * @mcast_flags: flags indicating the new multicast state | |
1025 | * | |
1026 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
1027 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1028 | * |
1029 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
1030 | */ |
1031 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
1032 | struct batadv_orig_node *orig, | |
6b5e971a | 1033 | u8 mcast_flags) |
ab49886e | 1034 | { |
8a4023c5 LL |
1035 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
1036 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
1037 | ||
5274cd68 SE |
1038 | lockdep_assert_held(&orig->mcast_handler_lock); |
1039 | ||
ab49886e LL |
1040 | /* switched from flag unset to set */ |
1041 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
1042 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
1043 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
1044 | ||
1045 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1046 | /* flag checks above + mcast_handler_lock prevents this */ |
1047 | WARN_ON(!hlist_unhashed(node)); | |
1048 | ||
1049 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
1050 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1051 | /* switched from flag set to unset */ | |
1052 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
1053 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
1054 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
1055 | ||
1056 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1057 | /* flag checks above + mcast_handler_lock prevents this */ |
1058 | WARN_ON(hlist_unhashed(node)); | |
1059 | ||
1060 | hlist_del_init_rcu(node); | |
ab49886e LL |
1061 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1062 | } | |
1063 | } | |
1064 | ||
4c8755d6 | 1065 | /** |
7e9a8c2c | 1066 | * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list |
4c8755d6 LL |
1067 | * @bat_priv: the bat priv with all the soft interface information |
1068 | * @orig: the orig_node which multicast state might have changed of | |
1069 | * @mcast_flags: flags indicating the new multicast state | |
1070 | * | |
1071 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
1072 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1073 | * |
1074 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1075 | */ |
1076 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
1077 | struct batadv_orig_node *orig, | |
6b5e971a | 1078 | u8 mcast_flags) |
4c8755d6 | 1079 | { |
8a4023c5 LL |
1080 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
1081 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
1082 | ||
5274cd68 SE |
1083 | lockdep_assert_held(&orig->mcast_handler_lock); |
1084 | ||
4c8755d6 LL |
1085 | /* switched from flag unset to set */ |
1086 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
1087 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
1088 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
1089 | ||
1090 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1091 | /* flag checks above + mcast_handler_lock prevents this */ |
1092 | WARN_ON(!hlist_unhashed(node)); | |
1093 | ||
1094 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1095 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1096 | /* switched from flag set to unset */ | |
1097 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
1098 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
1099 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
1100 | ||
1101 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1102 | /* flag checks above + mcast_handler_lock prevents this */ |
1103 | WARN_ON(hlist_unhashed(node)); | |
1104 | ||
1105 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1106 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /** | |
7e9a8c2c | 1111 | * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list |
4c8755d6 LL |
1112 | * @bat_priv: the bat priv with all the soft interface information |
1113 | * @orig: the orig_node which multicast state might have changed of | |
1114 | * @mcast_flags: flags indicating the new multicast state | |
1115 | * | |
1116 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
1117 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1118 | * |
1119 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1120 | */ |
1121 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
1122 | struct batadv_orig_node *orig, | |
6b5e971a | 1123 | u8 mcast_flags) |
4c8755d6 | 1124 | { |
8a4023c5 LL |
1125 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1126 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
1127 | ||
5274cd68 SE |
1128 | lockdep_assert_held(&orig->mcast_handler_lock); |
1129 | ||
4c8755d6 LL |
1130 | /* switched from flag unset to set */ |
1131 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
1132 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
1133 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
1134 | ||
1135 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1136 | /* flag checks above + mcast_handler_lock prevents this */ |
1137 | WARN_ON(!hlist_unhashed(node)); | |
1138 | ||
1139 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1140 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1141 | /* switched from flag set to unset */ | |
1142 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
1143 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
1144 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
1145 | ||
1146 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1147 | /* flag checks above + mcast_handler_lock prevents this */ |
1148 | WARN_ON(hlist_unhashed(node)); | |
1149 | ||
1150 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1151 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1152 | } | |
1153 | } | |
1154 | ||
60432d75 | 1155 | /** |
7e9a8c2c | 1156 | * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container |
60432d75 LL |
1157 | * @bat_priv: the bat priv with all the soft interface information |
1158 | * @orig: the orig_node of the ogm | |
1159 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
1160 | * @tvlv_value: tvlv buffer containing the multicast data | |
1161 | * @tvlv_value_len: tvlv buffer length | |
1162 | */ | |
bd2a979e LL |
1163 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
1164 | struct batadv_orig_node *orig, | |
1165 | u8 flags, | |
1166 | void *tvlv_value, | |
1167 | u16 tvlv_value_len) | |
60432d75 LL |
1168 | { |
1169 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 1170 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 | 1171 | |
8a4023c5 | 1172 | if (orig_mcast_enabled && tvlv_value && |
825ffe1f | 1173 | tvlv_value_len >= sizeof(mcast_flags)) |
6b5e971a | 1174 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 | 1175 | |
f26e4e98 LL |
1176 | if (!orig_mcast_enabled) { |
1177 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
1178 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
1179 | } | |
1180 | ||
8a4023c5 | 1181 | spin_lock_bh(&orig->mcast_handler_lock); |
60432d75 | 1182 | |
60432d75 | 1183 | if (orig_mcast_enabled && |
9c936e3f | 1184 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
9c936e3f | 1185 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 | 1186 | } else if (!orig_mcast_enabled && |
f26e4e98 | 1187 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
9c936e3f | 1188 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
1189 | } |
1190 | ||
9c936e3f | 1191 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 1192 | |
ab49886e | 1193 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
1194 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
1195 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 1196 | |
60432d75 | 1197 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 1198 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
1199 | } |
1200 | ||
1201 | /** | |
7e9a8c2c | 1202 | * batadv_mcast_init() - initialize the multicast optimizations structures |
60432d75 LL |
1203 | * @bat_priv: the bat priv with all the soft interface information |
1204 | */ | |
1205 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
1206 | { | |
bd2a979e LL |
1207 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
1208 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 | 1209 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
cbebd363 LL |
1210 | |
1211 | INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); | |
1212 | batadv_mcast_start_timer(bat_priv); | |
60432d75 LL |
1213 | } |
1214 | ||
dc1cbd14 | 1215 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
4e3e823b | 1216 | /** |
7e9a8c2c | 1217 | * batadv_mcast_flags_print_header() - print own mcast flags to debugfs table |
4e3e823b LL |
1218 | * @bat_priv: the bat priv with all the soft interface information |
1219 | * @seq: debugfs table seq_file struct | |
1220 | * | |
1221 | * Prints our own multicast flags including a more specific reason why | |
1222 | * they are set, that is prints the bridge and querier state too, to | |
1223 | * the debugfs table specified via @seq. | |
1224 | */ | |
1225 | static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv, | |
1226 | struct seq_file *seq) | |
1227 | { | |
1228 | u8 flags = bat_priv->mcast.flags; | |
1229 | char querier4, querier6, shadowing4, shadowing6; | |
1230 | bool bridged = bat_priv->mcast.bridged; | |
1231 | ||
1232 | if (bridged) { | |
1233 | querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4'; | |
1234 | querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6'; | |
1235 | shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.'; | |
1236 | shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.'; | |
1237 | } else { | |
1238 | querier4 = '?'; | |
1239 | querier6 = '?'; | |
1240 | shadowing4 = '?'; | |
1241 | shadowing6 = '?'; | |
1242 | } | |
1243 | ||
1244 | seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n", | |
1245 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', | |
1246 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
1247 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.'); | |
1248 | seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.'); | |
1249 | seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n", | |
1250 | querier4, querier6); | |
1251 | seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n", | |
1252 | shadowing4, shadowing6); | |
1253 | seq_puts(seq, "-------------------------------------------\n"); | |
1254 | seq_printf(seq, " %-10s %s\n", "Originator", "Flags"); | |
1255 | } | |
1256 | ||
1257 | /** | |
7e9a8c2c | 1258 | * batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes |
4e3e823b LL |
1259 | * @seq: seq file to print on |
1260 | * @offset: not used | |
1261 | * | |
1262 | * This prints a table of (primary) originators and their according | |
1263 | * multicast flags, including (in the header) our own. | |
1264 | * | |
1265 | * Return: always 0 | |
1266 | */ | |
1267 | int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset) | |
1268 | { | |
1269 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1270 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1271 | struct batadv_hard_iface *primary_if; | |
1272 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1273 | struct batadv_orig_node *orig_node; | |
1274 | struct hlist_head *head; | |
1275 | u8 flags; | |
1276 | u32 i; | |
1277 | ||
1278 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1279 | if (!primary_if) | |
1280 | return 0; | |
1281 | ||
1282 | batadv_mcast_flags_print_header(bat_priv, seq); | |
1283 | ||
1284 | for (i = 0; i < hash->size; i++) { | |
1285 | head = &hash->table[i]; | |
1286 | ||
1287 | rcu_read_lock(); | |
1288 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1289 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1290 | &orig_node->capa_initialized)) | |
1291 | continue; | |
1292 | ||
1293 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1294 | &orig_node->capabilities)) { | |
1295 | seq_printf(seq, "%pM -\n", orig_node->orig); | |
1296 | continue; | |
1297 | } | |
1298 | ||
1299 | flags = orig_node->mcast_flags; | |
1300 | ||
1301 | seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig, | |
1302 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) | |
1303 | ? 'U' : '.', | |
1304 | (flags & BATADV_MCAST_WANT_ALL_IPV4) | |
1305 | ? '4' : '.', | |
1306 | (flags & BATADV_MCAST_WANT_ALL_IPV6) | |
1307 | ? '6' : '.'); | |
1308 | } | |
1309 | rcu_read_unlock(); | |
1310 | } | |
1311 | ||
1312 | batadv_hardif_put(primary_if); | |
1313 | ||
1314 | return 0; | |
1315 | } | |
dc1cbd14 | 1316 | #endif |
4e3e823b | 1317 | |
53dd9a68 LL |
1318 | /** |
1319 | * batadv_mcast_mesh_info_put() - put multicast info into a netlink message | |
1320 | * @msg: buffer for the message | |
1321 | * @bat_priv: the bat priv with all the soft interface information | |
1322 | * | |
1323 | * Return: 0 or error code. | |
1324 | */ | |
1325 | int batadv_mcast_mesh_info_put(struct sk_buff *msg, | |
1326 | struct batadv_priv *bat_priv) | |
1327 | { | |
1328 | u32 flags = bat_priv->mcast.flags; | |
1329 | u32 flags_priv = BATADV_NO_FLAGS; | |
1330 | ||
1331 | if (bat_priv->mcast.bridged) { | |
1332 | flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; | |
1333 | ||
1334 | if (bat_priv->mcast.querier_ipv4.exists) | |
1335 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; | |
1336 | if (bat_priv->mcast.querier_ipv6.exists) | |
1337 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; | |
1338 | if (bat_priv->mcast.querier_ipv4.shadowing) | |
1339 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; | |
1340 | if (bat_priv->mcast.querier_ipv6.shadowing) | |
1341 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; | |
1342 | } | |
1343 | ||
1344 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) || | |
1345 | nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv)) | |
1346 | return -EMSGSIZE; | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | /** | |
1352 | * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table | |
1353 | * to a netlink socket | |
1354 | * @msg: buffer for the message | |
1355 | * @portid: netlink port | |
d2d489b7 | 1356 | * @cb: Control block containing additional options |
53dd9a68 LL |
1357 | * @orig_node: originator to dump the multicast flags of |
1358 | * | |
1359 | * Return: 0 or error code. | |
1360 | */ | |
1361 | static int | |
d2d489b7 SE |
1362 | batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, |
1363 | struct netlink_callback *cb, | |
53dd9a68 LL |
1364 | struct batadv_orig_node *orig_node) |
1365 | { | |
1366 | void *hdr; | |
1367 | ||
d2d489b7 SE |
1368 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
1369 | &batadv_netlink_family, NLM_F_MULTI, | |
1370 | BATADV_CMD_GET_MCAST_FLAGS); | |
53dd9a68 LL |
1371 | if (!hdr) |
1372 | return -ENOBUFS; | |
1373 | ||
d2d489b7 SE |
1374 | genl_dump_check_consistent(cb, hdr); |
1375 | ||
53dd9a68 LL |
1376 | if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, |
1377 | orig_node->orig)) { | |
1378 | genlmsg_cancel(msg, hdr); | |
1379 | return -EMSGSIZE; | |
1380 | } | |
1381 | ||
1382 | if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
1383 | &orig_node->capabilities)) { | |
1384 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, | |
1385 | orig_node->mcast_flags)) { | |
1386 | genlmsg_cancel(msg, hdr); | |
1387 | return -EMSGSIZE; | |
1388 | } | |
1389 | } | |
1390 | ||
1391 | genlmsg_end(msg, hdr); | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags | |
1397 | * table to a netlink socket | |
1398 | * @msg: buffer for the message | |
1399 | * @portid: netlink port | |
d2d489b7 SE |
1400 | * @cb: Control block containing additional options |
1401 | * @hash: hash to dump | |
1402 | * @bucket: bucket index to dump | |
53dd9a68 LL |
1403 | * @idx_skip: How many entries to skip |
1404 | * | |
1405 | * Return: 0 or error code. | |
1406 | */ | |
1407 | static int | |
d2d489b7 SE |
1408 | batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, |
1409 | struct netlink_callback *cb, | |
1410 | struct batadv_hashtable *hash, | |
1411 | unsigned int bucket, long *idx_skip) | |
53dd9a68 LL |
1412 | { |
1413 | struct batadv_orig_node *orig_node; | |
1414 | long idx = 0; | |
1415 | ||
d2d489b7 SE |
1416 | spin_lock_bh(&hash->list_locks[bucket]); |
1417 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
1418 | ||
1419 | hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) { | |
53dd9a68 LL |
1420 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
1421 | &orig_node->capa_initialized)) | |
1422 | continue; | |
1423 | ||
1424 | if (idx < *idx_skip) | |
1425 | goto skip; | |
1426 | ||
d2d489b7 SE |
1427 | if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) { |
1428 | spin_unlock_bh(&hash->list_locks[bucket]); | |
53dd9a68 LL |
1429 | *idx_skip = idx; |
1430 | ||
1431 | return -EMSGSIZE; | |
1432 | } | |
1433 | ||
1434 | skip: | |
1435 | idx++; | |
1436 | } | |
d2d489b7 | 1437 | spin_unlock_bh(&hash->list_locks[bucket]); |
53dd9a68 LL |
1438 | |
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | /** | |
1443 | * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
1444 | * @msg: buffer for the message | |
1445 | * @portid: netlink port | |
d2d489b7 | 1446 | * @cb: Control block containing additional options |
53dd9a68 LL |
1447 | * @bat_priv: the bat priv with all the soft interface information |
1448 | * @bucket: current bucket to dump | |
1449 | * @idx: index in current bucket to the next entry to dump | |
1450 | * | |
1451 | * Return: 0 or error code. | |
1452 | */ | |
1453 | static int | |
d2d489b7 SE |
1454 | __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, |
1455 | struct netlink_callback *cb, | |
53dd9a68 LL |
1456 | struct batadv_priv *bat_priv, long *bucket, long *idx) |
1457 | { | |
1458 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1459 | long bucket_tmp = *bucket; | |
53dd9a68 LL |
1460 | long idx_tmp = *idx; |
1461 | ||
1462 | while (bucket_tmp < hash->size) { | |
d2d489b7 SE |
1463 | if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash, |
1464 | *bucket, &idx_tmp)) | |
53dd9a68 LL |
1465 | break; |
1466 | ||
1467 | bucket_tmp++; | |
1468 | idx_tmp = 0; | |
1469 | } | |
1470 | ||
1471 | *bucket = bucket_tmp; | |
1472 | *idx = idx_tmp; | |
1473 | ||
1474 | return msg->len; | |
1475 | } | |
1476 | ||
1477 | /** | |
1478 | * batadv_mcast_netlink_get_primary() - get primary interface from netlink | |
1479 | * callback | |
1480 | * @cb: netlink callback structure | |
1481 | * @primary_if: the primary interface pointer to return the result in | |
1482 | * | |
1483 | * Return: 0 or error code. | |
1484 | */ | |
1485 | static int | |
1486 | batadv_mcast_netlink_get_primary(struct netlink_callback *cb, | |
1487 | struct batadv_hard_iface **primary_if) | |
1488 | { | |
1489 | struct batadv_hard_iface *hard_iface = NULL; | |
1490 | struct net *net = sock_net(cb->skb->sk); | |
1491 | struct net_device *soft_iface; | |
1492 | struct batadv_priv *bat_priv; | |
1493 | int ifindex; | |
1494 | int ret = 0; | |
1495 | ||
1496 | ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); | |
1497 | if (!ifindex) | |
1498 | return -EINVAL; | |
1499 | ||
1500 | soft_iface = dev_get_by_index(net, ifindex); | |
1501 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
1502 | ret = -ENODEV; | |
1503 | goto out; | |
1504 | } | |
1505 | ||
1506 | bat_priv = netdev_priv(soft_iface); | |
1507 | ||
1508 | hard_iface = batadv_primary_if_get_selected(bat_priv); | |
1509 | if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { | |
1510 | ret = -ENOENT; | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | out: | |
1515 | if (soft_iface) | |
1516 | dev_put(soft_iface); | |
1517 | ||
1518 | if (!ret && primary_if) | |
1519 | *primary_if = hard_iface; | |
65cc02a8 | 1520 | else if (hard_iface) |
53dd9a68 LL |
1521 | batadv_hardif_put(hard_iface); |
1522 | ||
1523 | return ret; | |
1524 | } | |
1525 | ||
1526 | /** | |
1527 | * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
1528 | * @msg: buffer for the message | |
1529 | * @cb: callback structure containing arguments | |
1530 | * | |
1531 | * Return: message length. | |
1532 | */ | |
1533 | int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
1534 | { | |
1535 | struct batadv_hard_iface *primary_if = NULL; | |
1536 | int portid = NETLINK_CB(cb->skb).portid; | |
1537 | struct batadv_priv *bat_priv; | |
1538 | long *bucket = &cb->args[0]; | |
1539 | long *idx = &cb->args[1]; | |
1540 | int ret; | |
1541 | ||
1542 | ret = batadv_mcast_netlink_get_primary(cb, &primary_if); | |
1543 | if (ret) | |
1544 | return ret; | |
1545 | ||
1546 | bat_priv = netdev_priv(primary_if->soft_iface); | |
d2d489b7 | 1547 | ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx); |
53dd9a68 LL |
1548 | |
1549 | batadv_hardif_put(primary_if); | |
1550 | return ret; | |
1551 | } | |
1552 | ||
c5caf4ef | 1553 | /** |
7e9a8c2c | 1554 | * batadv_mcast_free() - free the multicast optimizations structures |
c5caf4ef LL |
1555 | * @bat_priv: the bat priv with all the soft interface information |
1556 | */ | |
1557 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
1558 | { | |
cbebd363 LL |
1559 | cancel_delayed_work_sync(&bat_priv->mcast.work); |
1560 | ||
bd2a979e LL |
1561 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
1562 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 1563 | |
cbebd363 | 1564 | /* safely calling outside of worker, as worker was canceled above */ |
c5caf4ef LL |
1565 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
1566 | } | |
60432d75 LL |
1567 | |
1568 | /** | |
7e9a8c2c | 1569 | * batadv_mcast_purge_orig() - reset originator global mcast state modifications |
60432d75 LL |
1570 | * @orig: the originator which is going to get purged |
1571 | */ | |
1572 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
1573 | { | |
1574 | struct batadv_priv *bat_priv = orig->bat_priv; | |
1575 | ||
8a4023c5 LL |
1576 | spin_lock_bh(&orig->mcast_handler_lock); |
1577 | ||
ab49886e | 1578 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); |
4c8755d6 LL |
1579 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
1580 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
1581 | |
1582 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 1583 | } |