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9f6446c7 | 1 | /* Copyright (C) 2014-2015 B.A.T.M.A.N. contributors: |
c5caf4ef LL |
2 | * |
3 | * Linus Lüssing | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "main.h" | |
19 | #include "multicast.h" | |
20 | #include "originator.h" | |
21 | #include "hard-interface.h" | |
22 | #include "translation-table.h" | |
23 | ||
24 | /** | |
25 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
26 | * @dev: the device to collect multicast addresses from | |
27 | * @mcast_list: a list to put found addresses into | |
28 | * | |
29 | * Collect multicast addresses of the local multicast listeners | |
30 | * on the given soft interface, dev, in the given mcast_list. | |
31 | * | |
32 | * Returns -ENOMEM on memory allocation error or the number of | |
33 | * items added to the mcast_list otherwise. | |
34 | */ | |
35 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
36 | struct hlist_head *mcast_list) | |
37 | { | |
38 | struct netdev_hw_addr *mc_list_entry; | |
39 | struct batadv_hw_addr *new; | |
40 | int ret = 0; | |
41 | ||
42 | netif_addr_lock_bh(dev); | |
43 | netdev_for_each_mc_addr(mc_list_entry, dev) { | |
44 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
45 | if (!new) { | |
46 | ret = -ENOMEM; | |
47 | break; | |
48 | } | |
49 | ||
50 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
51 | hlist_add_head(&new->list, mcast_list); | |
52 | ret++; | |
53 | } | |
54 | netif_addr_unlock_bh(dev); | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | /** | |
60 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
61 | * @mcast_addr: the multicast address to check | |
62 | * @mcast_list: the list with multicast addresses to search in | |
63 | * | |
64 | * Returns true if the given address is already in the given list. | |
65 | * Otherwise returns false. | |
66 | */ | |
67 | static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr, | |
68 | struct hlist_head *mcast_list) | |
69 | { | |
70 | struct batadv_hw_addr *mcast_entry; | |
71 | ||
72 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
73 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
74 | return true; | |
75 | ||
76 | return false; | |
77 | } | |
78 | ||
79 | /** | |
80 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
81 | * @mcast_list: the list to free | |
82 | * | |
83 | * Removes and frees all items in the given mcast_list. | |
84 | */ | |
85 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) | |
86 | { | |
87 | struct batadv_hw_addr *mcast_entry; | |
88 | struct hlist_node *tmp; | |
89 | ||
90 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
91 | hlist_del(&mcast_entry->list); | |
92 | kfree(mcast_entry); | |
93 | } | |
94 | } | |
95 | ||
96 | /** | |
97 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
98 | * @bat_priv: the bat priv with all the soft interface information | |
99 | * @mcast_list: a list of addresses which should _not_ be removed | |
100 | * | |
101 | * Retracts the announcement of any multicast listener from the | |
102 | * translation table except the ones listed in the given mcast_list. | |
103 | * | |
104 | * If mcast_list is NULL then all are retracted. | |
105 | */ | |
106 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
107 | struct hlist_head *mcast_list) | |
108 | { | |
109 | struct batadv_hw_addr *mcast_entry; | |
110 | struct hlist_node *tmp; | |
111 | ||
112 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, | |
113 | list) { | |
114 | if (mcast_list && | |
115 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
116 | mcast_list)) | |
117 | continue; | |
118 | ||
119 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
120 | BATADV_NO_FLAGS, | |
121 | "mcast TT outdated", false); | |
122 | ||
123 | hlist_del(&mcast_entry->list); | |
124 | kfree(mcast_entry); | |
125 | } | |
126 | } | |
127 | ||
128 | /** | |
129 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
130 | * @bat_priv: the bat priv with all the soft interface information | |
131 | * @mcast_list: a list of addresses which are going to get added | |
132 | * | |
133 | * Adds multicast listener announcements from the given mcast_list to the | |
134 | * translation table if they have not been added yet. | |
135 | */ | |
136 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
137 | struct hlist_head *mcast_list) | |
138 | { | |
139 | struct batadv_hw_addr *mcast_entry; | |
140 | struct hlist_node *tmp; | |
141 | ||
142 | if (!mcast_list) | |
143 | return; | |
144 | ||
145 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
146 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
147 | &bat_priv->mcast.mla_list)) | |
148 | continue; | |
149 | ||
150 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
151 | mcast_entry->addr, BATADV_NO_FLAGS, | |
152 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
153 | continue; | |
154 | ||
155 | hlist_del(&mcast_entry->list); | |
156 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
157 | } | |
158 | } | |
159 | ||
160 | /** | |
161 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
162 | * @bat_priv: the bat priv with all the soft interface information | |
163 | * | |
164 | * Checks whether there is a bridge on top of our soft interface. Returns | |
165 | * true if so, false otherwise. | |
166 | */ | |
167 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
168 | { | |
169 | struct net_device *upper = bat_priv->soft_iface; | |
170 | ||
171 | rcu_read_lock(); | |
172 | do { | |
173 | upper = netdev_master_upper_dev_get_rcu(upper); | |
174 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
175 | rcu_read_unlock(); | |
176 | ||
177 | return upper; | |
178 | } | |
179 | ||
60432d75 LL |
180 | /** |
181 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
182 | * @bat_priv: the bat priv with all the soft interface information | |
183 | * | |
184 | * Updates the own multicast tvlv with our current multicast related settings, | |
185 | * capabilities and inabilities. | |
186 | * | |
187 | * Returns true if the tvlv container is registered afterwards. Otherwise | |
188 | * returns false. | |
189 | */ | |
190 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
191 | { | |
192 | struct batadv_tvlv_mcast_data mcast_data; | |
193 | ||
194 | mcast_data.flags = BATADV_NO_FLAGS; | |
195 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
196 | ||
197 | /* Avoid attaching MLAs, if there is a bridge on top of our soft | |
198 | * interface, we don't support that yet (TODO) | |
199 | */ | |
200 | if (batadv_mcast_has_bridge(bat_priv)) { | |
201 | if (bat_priv->mcast.enabled) { | |
202 | batadv_tvlv_container_unregister(bat_priv, | |
203 | BATADV_TVLV_MCAST, 1); | |
204 | bat_priv->mcast.enabled = false; | |
205 | } | |
206 | ||
207 | return false; | |
208 | } | |
209 | ||
210 | if (!bat_priv->mcast.enabled || | |
211 | mcast_data.flags != bat_priv->mcast.flags) { | |
212 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, | |
213 | &mcast_data, sizeof(mcast_data)); | |
214 | bat_priv->mcast.flags = mcast_data.flags; | |
215 | bat_priv->mcast.enabled = true; | |
216 | } | |
217 | ||
218 | return true; | |
219 | } | |
220 | ||
c5caf4ef LL |
221 | /** |
222 | * batadv_mcast_mla_update - update the own MLAs | |
223 | * @bat_priv: the bat priv with all the soft interface information | |
224 | * | |
60432d75 LL |
225 | * Updates the own multicast listener announcements in the translation |
226 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
227 | */ |
228 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
229 | { | |
230 | struct net_device *soft_iface = bat_priv->soft_iface; | |
231 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
232 | int ret; | |
233 | ||
60432d75 | 234 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
235 | goto update; |
236 | ||
237 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
238 | if (ret < 0) | |
239 | goto out; | |
240 | ||
241 | update: | |
242 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
243 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
244 | ||
245 | out: | |
246 | batadv_mcast_mla_list_free(&mcast_list); | |
247 | } | |
248 | ||
ab49886e LL |
249 | /** |
250 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
251 | * @bat_priv: the bat priv with all the soft interface information | |
252 | * @skb: the IPv4 packet to check | |
253 | * @is_unsnoopable: stores whether the destination is snoopable | |
254 | * | |
255 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
256 | * mode more optimal than classic flooding. | |
257 | * | |
258 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM in case of | |
259 | * memory allocation failure. | |
260 | */ | |
261 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
262 | struct sk_buff *skb, | |
263 | bool *is_unsnoopable) | |
264 | { | |
265 | struct iphdr *iphdr; | |
266 | ||
267 | /* We might fail due to out-of-memory -> drop it */ | |
268 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
269 | return -ENOMEM; | |
270 | ||
271 | iphdr = ip_hdr(skb); | |
272 | ||
273 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
274 | * then allow scope > link local, too | |
275 | */ | |
276 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
277 | return -EINVAL; | |
278 | ||
279 | /* link-local multicast listeners behind a bridge are | |
280 | * not snoopable (see RFC4541, section 2.1.2.2) | |
281 | */ | |
282 | *is_unsnoopable = true; | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
1d8ab8d3 LL |
287 | /** |
288 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
289 | * @bat_priv: the bat priv with all the soft interface information | |
290 | * @skb: the IPv6 packet to check | |
ab49886e | 291 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
292 | * |
293 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
294 | * mode more optimal than classic flooding. | |
295 | * | |
296 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
297 | * of memory. | |
298 | */ | |
299 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
300 | struct sk_buff *skb, |
301 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
302 | { |
303 | struct ipv6hdr *ip6hdr; | |
304 | ||
305 | /* We might fail due to out-of-memory -> drop it */ | |
306 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
307 | return -ENOMEM; | |
308 | ||
309 | ip6hdr = ipv6_hdr(skb); | |
310 | ||
311 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
312 | * then allow scope > link local, too | |
313 | */ | |
314 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
315 | return -EINVAL; | |
316 | ||
317 | /* link-local-all-nodes multicast listeners behind a bridge are | |
318 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
319 | */ | |
320 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 321 | *is_unsnoopable = true; |
1d8ab8d3 LL |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /** | |
327 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
328 | * @bat_priv: the bat priv with all the soft interface information | |
329 | * @skb: the multicast frame to check | |
ab49886e | 330 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
331 | * |
332 | * Checks whether the given multicast ethernet frame has the potential to be | |
333 | * forwarded with a mode more optimal than classic flooding. | |
334 | * | |
335 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
336 | * of memory. | |
337 | */ | |
338 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
339 | struct sk_buff *skb, |
340 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
341 | { |
342 | struct ethhdr *ethhdr = eth_hdr(skb); | |
343 | ||
344 | if (!atomic_read(&bat_priv->multicast_mode)) | |
345 | return -EINVAL; | |
346 | ||
347 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
348 | return -EINVAL; | |
349 | ||
350 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
351 | case ETH_P_IP: |
352 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
353 | is_unsnoopable); | |
1d8ab8d3 | 354 | case ETH_P_IPV6: |
ab49886e LL |
355 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
356 | is_unsnoopable); | |
1d8ab8d3 LL |
357 | default: |
358 | return -EINVAL; | |
359 | } | |
360 | } | |
361 | ||
4c8755d6 LL |
362 | /** |
363 | * batadv_mcast_want_all_ip_count - count nodes with unspecific mcast interest | |
364 | * @bat_priv: the bat priv with all the soft interface information | |
365 | * @ethhdr: ethernet header of a packet | |
366 | * | |
367 | * Returns the number of nodes which want all IPv4 multicast traffic if the | |
368 | * given ethhdr is from an IPv4 packet or the number of nodes which want all | |
369 | * IPv6 traffic if it matches an IPv6 packet. | |
370 | */ | |
371 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
372 | struct ethhdr *ethhdr) | |
373 | { | |
374 | switch (ntohs(ethhdr->h_proto)) { | |
375 | case ETH_P_IP: | |
376 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
377 | case ETH_P_IPV6: | |
378 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
379 | default: | |
380 | /* we shouldn't be here... */ | |
381 | return 0; | |
382 | } | |
383 | } | |
384 | ||
1d8ab8d3 LL |
385 | /** |
386 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
387 | * @bat_priv: the bat priv with all the soft interface information | |
388 | * @ethhdr: the ether header containing the multicast destination | |
389 | * | |
390 | * Returns an orig_node matching the multicast address provided by ethhdr | |
391 | * via a translation table lookup. This increases the returned nodes refcount. | |
392 | */ | |
393 | static struct batadv_orig_node * | |
394 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
395 | struct ethhdr *ethhdr) | |
396 | { | |
397 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
398 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
399 | } | |
400 | ||
4c8755d6 LL |
401 | /** |
402 | * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag | |
403 | * @bat_priv: the bat priv with all the soft interface information | |
404 | * | |
405 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and | |
406 | * increases its refcount. | |
407 | */ | |
408 | static struct batadv_orig_node * | |
409 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
410 | { | |
411 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
412 | ||
413 | rcu_read_lock(); | |
414 | hlist_for_each_entry_rcu(tmp_orig_node, | |
415 | &bat_priv->mcast.want_all_ipv4_list, | |
416 | mcast_want_all_ipv4_node) { | |
af0a171c | 417 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
418 | continue; |
419 | ||
420 | orig_node = tmp_orig_node; | |
421 | break; | |
422 | } | |
423 | rcu_read_unlock(); | |
424 | ||
425 | return orig_node; | |
426 | } | |
427 | ||
428 | /** | |
429 | * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag | |
430 | * @bat_priv: the bat priv with all the soft interface information | |
431 | * | |
432 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set | |
433 | * and increases its refcount. | |
434 | */ | |
435 | static struct batadv_orig_node * | |
436 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
437 | { | |
438 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
439 | ||
440 | rcu_read_lock(); | |
441 | hlist_for_each_entry_rcu(tmp_orig_node, | |
442 | &bat_priv->mcast.want_all_ipv6_list, | |
443 | mcast_want_all_ipv6_node) { | |
af0a171c | 444 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
445 | continue; |
446 | ||
447 | orig_node = tmp_orig_node; | |
448 | break; | |
449 | } | |
450 | rcu_read_unlock(); | |
451 | ||
452 | return orig_node; | |
453 | } | |
454 | ||
455 | /** | |
456 | * batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag | |
457 | * @bat_priv: the bat priv with all the soft interface information | |
458 | * @ethhdr: an ethernet header to determine the protocol family from | |
459 | * | |
460 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or | |
461 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and | |
462 | * increases its refcount. | |
463 | */ | |
464 | static struct batadv_orig_node * | |
465 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
466 | struct ethhdr *ethhdr) | |
467 | { | |
468 | switch (ntohs(ethhdr->h_proto)) { | |
469 | case ETH_P_IP: | |
470 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
471 | case ETH_P_IPV6: | |
472 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
473 | default: | |
474 | /* we shouldn't be here... */ | |
475 | return NULL; | |
476 | } | |
477 | } | |
478 | ||
ab49886e LL |
479 | /** |
480 | * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag | |
481 | * @bat_priv: the bat priv with all the soft interface information | |
482 | * | |
483 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag | |
484 | * set and increases its refcount. | |
485 | */ | |
486 | static struct batadv_orig_node * | |
487 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
488 | { | |
489 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
490 | ||
491 | rcu_read_lock(); | |
492 | hlist_for_each_entry_rcu(tmp_orig_node, | |
493 | &bat_priv->mcast.want_all_unsnoopables_list, | |
494 | mcast_want_all_unsnoopables_node) { | |
af0a171c | 495 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
496 | continue; |
497 | ||
498 | orig_node = tmp_orig_node; | |
499 | break; | |
500 | } | |
501 | rcu_read_unlock(); | |
502 | ||
503 | return orig_node; | |
504 | } | |
505 | ||
1d8ab8d3 LL |
506 | /** |
507 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
508 | * @bat_priv: the bat priv with all the soft interface information | |
509 | * @skb: The multicast packet to check | |
510 | * @orig: an originator to be set to forward the skb to | |
511 | * | |
512 | * Returns the forwarding mode as enum batadv_forw_mode and in case of | |
513 | * BATADV_FORW_SINGLE set the orig to the single originator the skb | |
514 | * should be forwarded to. | |
515 | */ | |
516 | enum batadv_forw_mode | |
517 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
518 | struct batadv_orig_node **orig) | |
519 | { | |
4c8755d6 | 520 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 521 | bool is_unsnoopable = false; |
1d8ab8d3 | 522 | struct ethhdr *ethhdr; |
1d8ab8d3 | 523 | |
ab49886e | 524 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
525 | if (ret == -ENOMEM) |
526 | return BATADV_FORW_NONE; | |
527 | else if (ret < 0) | |
528 | return BATADV_FORW_ALL; | |
529 | ||
530 | ethhdr = eth_hdr(skb); | |
531 | ||
532 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
533 | BATADV_NO_FLAGS); | |
4c8755d6 | 534 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
535 | unsnoop_count = !is_unsnoopable ? 0 : |
536 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
537 | ||
4c8755d6 | 538 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 539 | |
ab49886e | 540 | switch (total_count) { |
1d8ab8d3 | 541 | case 1: |
ab49886e LL |
542 | if (tt_count) |
543 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
544 | else if (ip_count) |
545 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
546 | else if (unsnoop_count) |
547 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
548 | ||
1d8ab8d3 LL |
549 | if (*orig) |
550 | return BATADV_FORW_SINGLE; | |
551 | ||
552 | /* fall through */ | |
553 | case 0: | |
554 | return BATADV_FORW_NONE; | |
555 | default: | |
556 | return BATADV_FORW_ALL; | |
557 | } | |
558 | } | |
559 | ||
ab49886e LL |
560 | /** |
561 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
562 | * @bat_priv: the bat priv with all the soft interface information | |
563 | * @orig: the orig_node which multicast state might have changed of | |
564 | * @mcast_flags: flags indicating the new multicast state | |
565 | * | |
566 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
567 | * orig, has toggled then this method updates counter and list accordingly. | |
568 | */ | |
569 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
570 | struct batadv_orig_node *orig, | |
571 | uint8_t mcast_flags) | |
572 | { | |
573 | /* switched from flag unset to set */ | |
574 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
575 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
576 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
577 | ||
578 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
579 | hlist_add_head_rcu(&orig->mcast_want_all_unsnoopables_node, | |
580 | &bat_priv->mcast.want_all_unsnoopables_list); | |
581 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
582 | /* switched from flag set to unset */ | |
583 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
584 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
585 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
586 | ||
587 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
588 | hlist_del_rcu(&orig->mcast_want_all_unsnoopables_node); | |
589 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
590 | } | |
591 | } | |
592 | ||
4c8755d6 LL |
593 | /** |
594 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
595 | * @bat_priv: the bat priv with all the soft interface information | |
596 | * @orig: the orig_node which multicast state might have changed of | |
597 | * @mcast_flags: flags indicating the new multicast state | |
598 | * | |
599 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
600 | * toggled then this method updates counter and list accordingly. | |
601 | */ | |
602 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
603 | struct batadv_orig_node *orig, | |
604 | uint8_t mcast_flags) | |
605 | { | |
606 | /* switched from flag unset to set */ | |
607 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
608 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
609 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
610 | ||
611 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
612 | hlist_add_head_rcu(&orig->mcast_want_all_ipv4_node, | |
613 | &bat_priv->mcast.want_all_ipv4_list); | |
614 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
615 | /* switched from flag set to unset */ | |
616 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
617 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
618 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
619 | ||
620 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
621 | hlist_del_rcu(&orig->mcast_want_all_ipv4_node); | |
622 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
623 | } | |
624 | } | |
625 | ||
626 | /** | |
627 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
628 | * @bat_priv: the bat priv with all the soft interface information | |
629 | * @orig: the orig_node which multicast state might have changed of | |
630 | * @mcast_flags: flags indicating the new multicast state | |
631 | * | |
632 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
633 | * toggled then this method updates counter and list accordingly. | |
634 | */ | |
635 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
636 | struct batadv_orig_node *orig, | |
637 | uint8_t mcast_flags) | |
638 | { | |
639 | /* switched from flag unset to set */ | |
640 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
641 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
642 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
643 | ||
644 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
645 | hlist_add_head_rcu(&orig->mcast_want_all_ipv6_node, | |
646 | &bat_priv->mcast.want_all_ipv6_list); | |
647 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
648 | /* switched from flag set to unset */ | |
649 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
650 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
651 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
652 | ||
653 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
654 | hlist_del_rcu(&orig->mcast_want_all_ipv6_node); | |
655 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
656 | } | |
657 | } | |
658 | ||
60432d75 LL |
659 | /** |
660 | * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container | |
661 | * @bat_priv: the bat priv with all the soft interface information | |
662 | * @orig: the orig_node of the ogm | |
663 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
664 | * @tvlv_value: tvlv buffer containing the multicast data | |
665 | * @tvlv_value_len: tvlv buffer length | |
666 | */ | |
667 | static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
668 | struct batadv_orig_node *orig, | |
669 | uint8_t flags, | |
670 | void *tvlv_value, | |
671 | uint16_t tvlv_value_len) | |
672 | { | |
673 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
674 | uint8_t mcast_flags = BATADV_NO_FLAGS; | |
675 | bool orig_initialized; | |
676 | ||
677 | orig_initialized = orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST; | |
678 | ||
679 | /* If mcast support is turned on decrease the disabled mcast node | |
680 | * counter only if we had increased it for this node before. If this | |
681 | * is a completely new orig_node no need to decrease the counter. | |
682 | */ | |
683 | if (orig_mcast_enabled && | |
684 | !(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) { | |
685 | if (orig_initialized) | |
686 | atomic_dec(&bat_priv->mcast.num_disabled); | |
687 | orig->capabilities |= BATADV_ORIG_CAPA_HAS_MCAST; | |
e8829f00 LL |
688 | /* If mcast support is being switched off or if this is an initial |
689 | * OGM without mcast support then increase the disabled mcast | |
690 | * node counter. | |
60432d75 LL |
691 | */ |
692 | } else if (!orig_mcast_enabled && | |
e8829f00 LL |
693 | (orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST || |
694 | !orig_initialized)) { | |
60432d75 LL |
695 | atomic_inc(&bat_priv->mcast.num_disabled); |
696 | orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_MCAST; | |
697 | } | |
698 | ||
699 | orig->capa_initialized |= BATADV_ORIG_CAPA_HAS_MCAST; | |
700 | ||
701 | if (orig_mcast_enabled && tvlv_value && | |
702 | (tvlv_value_len >= sizeof(mcast_flags))) | |
703 | mcast_flags = *(uint8_t *)tvlv_value; | |
704 | ||
ab49886e | 705 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
706 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
707 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 708 | |
60432d75 LL |
709 | orig->mcast_flags = mcast_flags; |
710 | } | |
711 | ||
712 | /** | |
713 | * batadv_mcast_init - initialize the multicast optimizations structures | |
714 | * @bat_priv: the bat priv with all the soft interface information | |
715 | */ | |
716 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
717 | { | |
718 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, | |
719 | NULL, BATADV_TVLV_MCAST, 1, | |
720 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
721 | } | |
722 | ||
c5caf4ef LL |
723 | /** |
724 | * batadv_mcast_free - free the multicast optimizations structures | |
725 | * @bat_priv: the bat priv with all the soft interface information | |
726 | */ | |
727 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
728 | { | |
60432d75 LL |
729 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); |
730 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); | |
731 | ||
c5caf4ef LL |
732 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
733 | } | |
60432d75 LL |
734 | |
735 | /** | |
736 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
737 | * @orig: the originator which is going to get purged | |
738 | */ | |
739 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
740 | { | |
741 | struct batadv_priv *bat_priv = orig->bat_priv; | |
742 | ||
a5164886 LL |
743 | if (!(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST) && |
744 | orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST) | |
60432d75 | 745 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
746 | |
747 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
748 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
749 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
60432d75 | 750 | } |