Commit | Line | Data |
---|---|---|
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 | ||
c5caf4ef | 18 | #include "multicast.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/in6.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/rcupdate.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/spinlock.h> | |
38 | #include <linux/stddef.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/types.h> | |
41 | #include <net/addrconf.h> | |
42 | #include <net/ipv6.h> | |
43 | ||
44 | #include "packet.h" | |
c5caf4ef LL |
45 | #include "translation-table.h" |
46 | ||
47 | /** | |
48 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
49 | * @dev: the device to collect multicast addresses from | |
50 | * @mcast_list: a list to put found addresses into | |
51 | * | |
52 | * Collect multicast addresses of the local multicast listeners | |
53 | * on the given soft interface, dev, in the given mcast_list. | |
54 | * | |
55 | * Returns -ENOMEM on memory allocation error or the number of | |
56 | * items added to the mcast_list otherwise. | |
57 | */ | |
58 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
59 | struct hlist_head *mcast_list) | |
60 | { | |
61 | struct netdev_hw_addr *mc_list_entry; | |
62 | struct batadv_hw_addr *new; | |
63 | int ret = 0; | |
64 | ||
65 | netif_addr_lock_bh(dev); | |
66 | netdev_for_each_mc_addr(mc_list_entry, dev) { | |
67 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
68 | if (!new) { | |
69 | ret = -ENOMEM; | |
70 | break; | |
71 | } | |
72 | ||
73 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
74 | hlist_add_head(&new->list, mcast_list); | |
75 | ret++; | |
76 | } | |
77 | netif_addr_unlock_bh(dev); | |
78 | ||
79 | return ret; | |
80 | } | |
81 | ||
82 | /** | |
83 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
84 | * @mcast_addr: the multicast address to check | |
85 | * @mcast_list: the list with multicast addresses to search in | |
86 | * | |
87 | * Returns true if the given address is already in the given list. | |
88 | * Otherwise returns false. | |
89 | */ | |
90 | static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr, | |
91 | struct hlist_head *mcast_list) | |
92 | { | |
93 | struct batadv_hw_addr *mcast_entry; | |
94 | ||
95 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
96 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
97 | return true; | |
98 | ||
99 | return false; | |
100 | } | |
101 | ||
102 | /** | |
103 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
104 | * @mcast_list: the list to free | |
105 | * | |
106 | * Removes and frees all items in the given mcast_list. | |
107 | */ | |
108 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) | |
109 | { | |
110 | struct batadv_hw_addr *mcast_entry; | |
111 | struct hlist_node *tmp; | |
112 | ||
113 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
114 | hlist_del(&mcast_entry->list); | |
115 | kfree(mcast_entry); | |
116 | } | |
117 | } | |
118 | ||
119 | /** | |
120 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
121 | * @bat_priv: the bat priv with all the soft interface information | |
122 | * @mcast_list: a list of addresses which should _not_ be removed | |
123 | * | |
124 | * Retracts the announcement of any multicast listener from the | |
125 | * translation table except the ones listed in the given mcast_list. | |
126 | * | |
127 | * If mcast_list is NULL then all are retracted. | |
128 | */ | |
129 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
130 | struct hlist_head *mcast_list) | |
131 | { | |
132 | struct batadv_hw_addr *mcast_entry; | |
133 | struct hlist_node *tmp; | |
134 | ||
135 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, | |
136 | list) { | |
137 | if (mcast_list && | |
138 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
139 | mcast_list)) | |
140 | continue; | |
141 | ||
142 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
143 | BATADV_NO_FLAGS, | |
144 | "mcast TT outdated", false); | |
145 | ||
146 | hlist_del(&mcast_entry->list); | |
147 | kfree(mcast_entry); | |
148 | } | |
149 | } | |
150 | ||
151 | /** | |
152 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
153 | * @bat_priv: the bat priv with all the soft interface information | |
154 | * @mcast_list: a list of addresses which are going to get added | |
155 | * | |
156 | * Adds multicast listener announcements from the given mcast_list to the | |
157 | * translation table if they have not been added yet. | |
158 | */ | |
159 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
160 | struct hlist_head *mcast_list) | |
161 | { | |
162 | struct batadv_hw_addr *mcast_entry; | |
163 | struct hlist_node *tmp; | |
164 | ||
165 | if (!mcast_list) | |
166 | return; | |
167 | ||
168 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
169 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
170 | &bat_priv->mcast.mla_list)) | |
171 | continue; | |
172 | ||
173 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
174 | mcast_entry->addr, BATADV_NO_FLAGS, | |
175 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
176 | continue; | |
177 | ||
178 | hlist_del(&mcast_entry->list); | |
179 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
180 | } | |
181 | } | |
182 | ||
183 | /** | |
184 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
185 | * @bat_priv: the bat priv with all the soft interface information | |
186 | * | |
187 | * Checks whether there is a bridge on top of our soft interface. Returns | |
188 | * true if so, false otherwise. | |
189 | */ | |
190 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
191 | { | |
192 | struct net_device *upper = bat_priv->soft_iface; | |
193 | ||
194 | rcu_read_lock(); | |
195 | do { | |
196 | upper = netdev_master_upper_dev_get_rcu(upper); | |
197 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
198 | rcu_read_unlock(); | |
199 | ||
200 | return upper; | |
201 | } | |
202 | ||
60432d75 LL |
203 | /** |
204 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
205 | * @bat_priv: the bat priv with all the soft interface information | |
206 | * | |
207 | * Updates the own multicast tvlv with our current multicast related settings, | |
208 | * capabilities and inabilities. | |
209 | * | |
210 | * Returns true if the tvlv container is registered afterwards. Otherwise | |
211 | * returns false. | |
212 | */ | |
213 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
214 | { | |
215 | struct batadv_tvlv_mcast_data mcast_data; | |
216 | ||
217 | mcast_data.flags = BATADV_NO_FLAGS; | |
218 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
219 | ||
220 | /* Avoid attaching MLAs, if there is a bridge on top of our soft | |
221 | * interface, we don't support that yet (TODO) | |
222 | */ | |
223 | if (batadv_mcast_has_bridge(bat_priv)) { | |
224 | if (bat_priv->mcast.enabled) { | |
225 | batadv_tvlv_container_unregister(bat_priv, | |
226 | BATADV_TVLV_MCAST, 1); | |
227 | bat_priv->mcast.enabled = false; | |
228 | } | |
229 | ||
230 | return false; | |
231 | } | |
232 | ||
233 | if (!bat_priv->mcast.enabled || | |
234 | mcast_data.flags != bat_priv->mcast.flags) { | |
235 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, | |
236 | &mcast_data, sizeof(mcast_data)); | |
237 | bat_priv->mcast.flags = mcast_data.flags; | |
238 | bat_priv->mcast.enabled = true; | |
239 | } | |
240 | ||
241 | return true; | |
242 | } | |
243 | ||
c5caf4ef LL |
244 | /** |
245 | * batadv_mcast_mla_update - update the own MLAs | |
246 | * @bat_priv: the bat priv with all the soft interface information | |
247 | * | |
60432d75 LL |
248 | * Updates the own multicast listener announcements in the translation |
249 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
250 | */ |
251 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
252 | { | |
253 | struct net_device *soft_iface = bat_priv->soft_iface; | |
254 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
255 | int ret; | |
256 | ||
60432d75 | 257 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
258 | goto update; |
259 | ||
260 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
261 | if (ret < 0) | |
262 | goto out; | |
263 | ||
264 | update: | |
265 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
266 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
267 | ||
268 | out: | |
269 | batadv_mcast_mla_list_free(&mcast_list); | |
270 | } | |
271 | ||
ab49886e LL |
272 | /** |
273 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
274 | * @bat_priv: the bat priv with all the soft interface information | |
275 | * @skb: the IPv4 packet to check | |
276 | * @is_unsnoopable: stores whether the destination is snoopable | |
277 | * | |
278 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
279 | * mode more optimal than classic flooding. | |
280 | * | |
281 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM in case of | |
282 | * memory allocation failure. | |
283 | */ | |
284 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
285 | struct sk_buff *skb, | |
286 | bool *is_unsnoopable) | |
287 | { | |
288 | struct iphdr *iphdr; | |
289 | ||
290 | /* We might fail due to out-of-memory -> drop it */ | |
291 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
292 | return -ENOMEM; | |
293 | ||
294 | iphdr = ip_hdr(skb); | |
295 | ||
296 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
297 | * then allow scope > link local, too | |
298 | */ | |
299 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
300 | return -EINVAL; | |
301 | ||
302 | /* link-local multicast listeners behind a bridge are | |
303 | * not snoopable (see RFC4541, section 2.1.2.2) | |
304 | */ | |
305 | *is_unsnoopable = true; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
1d8ab8d3 LL |
310 | /** |
311 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
312 | * @bat_priv: the bat priv with all the soft interface information | |
313 | * @skb: the IPv6 packet to check | |
ab49886e | 314 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
315 | * |
316 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
317 | * mode more optimal than classic flooding. | |
318 | * | |
319 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
320 | * of memory. | |
321 | */ | |
322 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
323 | struct sk_buff *skb, |
324 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
325 | { |
326 | struct ipv6hdr *ip6hdr; | |
327 | ||
328 | /* We might fail due to out-of-memory -> drop it */ | |
329 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
330 | return -ENOMEM; | |
331 | ||
332 | ip6hdr = ipv6_hdr(skb); | |
333 | ||
334 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
335 | * then allow scope > link local, too | |
336 | */ | |
337 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
338 | return -EINVAL; | |
339 | ||
340 | /* link-local-all-nodes multicast listeners behind a bridge are | |
341 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
342 | */ | |
343 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 344 | *is_unsnoopable = true; |
1d8ab8d3 LL |
345 | |
346 | return 0; | |
347 | } | |
348 | ||
349 | /** | |
350 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
351 | * @bat_priv: the bat priv with all the soft interface information | |
352 | * @skb: the multicast frame to check | |
ab49886e | 353 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
354 | * |
355 | * Checks whether the given multicast ethernet frame has the potential to be | |
356 | * forwarded with a mode more optimal than classic flooding. | |
357 | * | |
358 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
359 | * of memory. | |
360 | */ | |
361 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
362 | struct sk_buff *skb, |
363 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
364 | { |
365 | struct ethhdr *ethhdr = eth_hdr(skb); | |
366 | ||
367 | if (!atomic_read(&bat_priv->multicast_mode)) | |
368 | return -EINVAL; | |
369 | ||
370 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
371 | return -EINVAL; | |
372 | ||
373 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
374 | case ETH_P_IP: |
375 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
376 | is_unsnoopable); | |
1d8ab8d3 | 377 | case ETH_P_IPV6: |
ab49886e LL |
378 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
379 | is_unsnoopable); | |
1d8ab8d3 LL |
380 | default: |
381 | return -EINVAL; | |
382 | } | |
383 | } | |
384 | ||
4c8755d6 LL |
385 | /** |
386 | * batadv_mcast_want_all_ip_count - count nodes with unspecific mcast interest | |
387 | * @bat_priv: the bat priv with all the soft interface information | |
388 | * @ethhdr: ethernet header of a packet | |
389 | * | |
390 | * Returns the number of nodes which want all IPv4 multicast traffic if the | |
391 | * given ethhdr is from an IPv4 packet or the number of nodes which want all | |
392 | * IPv6 traffic if it matches an IPv6 packet. | |
393 | */ | |
394 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
395 | struct ethhdr *ethhdr) | |
396 | { | |
397 | switch (ntohs(ethhdr->h_proto)) { | |
398 | case ETH_P_IP: | |
399 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
400 | case ETH_P_IPV6: | |
401 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
402 | default: | |
403 | /* we shouldn't be here... */ | |
404 | return 0; | |
405 | } | |
406 | } | |
407 | ||
1d8ab8d3 LL |
408 | /** |
409 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
410 | * @bat_priv: the bat priv with all the soft interface information | |
411 | * @ethhdr: the ether header containing the multicast destination | |
412 | * | |
413 | * Returns an orig_node matching the multicast address provided by ethhdr | |
414 | * via a translation table lookup. This increases the returned nodes refcount. | |
415 | */ | |
416 | static struct batadv_orig_node * | |
417 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
418 | struct ethhdr *ethhdr) | |
419 | { | |
420 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
421 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
422 | } | |
423 | ||
4c8755d6 LL |
424 | /** |
425 | * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag | |
426 | * @bat_priv: the bat priv with all the soft interface information | |
427 | * | |
428 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and | |
429 | * increases its refcount. | |
430 | */ | |
431 | static struct batadv_orig_node * | |
432 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
433 | { | |
434 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
435 | ||
436 | rcu_read_lock(); | |
437 | hlist_for_each_entry_rcu(tmp_orig_node, | |
438 | &bat_priv->mcast.want_all_ipv4_list, | |
439 | mcast_want_all_ipv4_node) { | |
af0a171c | 440 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
441 | continue; |
442 | ||
443 | orig_node = tmp_orig_node; | |
444 | break; | |
445 | } | |
446 | rcu_read_unlock(); | |
447 | ||
448 | return orig_node; | |
449 | } | |
450 | ||
451 | /** | |
452 | * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag | |
453 | * @bat_priv: the bat priv with all the soft interface information | |
454 | * | |
455 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set | |
456 | * and increases its refcount. | |
457 | */ | |
458 | static struct batadv_orig_node * | |
459 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
460 | { | |
461 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
462 | ||
463 | rcu_read_lock(); | |
464 | hlist_for_each_entry_rcu(tmp_orig_node, | |
465 | &bat_priv->mcast.want_all_ipv6_list, | |
466 | mcast_want_all_ipv6_node) { | |
af0a171c | 467 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
468 | continue; |
469 | ||
470 | orig_node = tmp_orig_node; | |
471 | break; | |
472 | } | |
473 | rcu_read_unlock(); | |
474 | ||
475 | return orig_node; | |
476 | } | |
477 | ||
478 | /** | |
479 | * batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag | |
480 | * @bat_priv: the bat priv with all the soft interface information | |
481 | * @ethhdr: an ethernet header to determine the protocol family from | |
482 | * | |
483 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or | |
484 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and | |
485 | * increases its refcount. | |
486 | */ | |
487 | static struct batadv_orig_node * | |
488 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
489 | struct ethhdr *ethhdr) | |
490 | { | |
491 | switch (ntohs(ethhdr->h_proto)) { | |
492 | case ETH_P_IP: | |
493 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
494 | case ETH_P_IPV6: | |
495 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
496 | default: | |
497 | /* we shouldn't be here... */ | |
498 | return NULL; | |
499 | } | |
500 | } | |
501 | ||
ab49886e LL |
502 | /** |
503 | * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag | |
504 | * @bat_priv: the bat priv with all the soft interface information | |
505 | * | |
506 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag | |
507 | * set and increases its refcount. | |
508 | */ | |
509 | static struct batadv_orig_node * | |
510 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
511 | { | |
512 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
513 | ||
514 | rcu_read_lock(); | |
515 | hlist_for_each_entry_rcu(tmp_orig_node, | |
516 | &bat_priv->mcast.want_all_unsnoopables_list, | |
517 | mcast_want_all_unsnoopables_node) { | |
af0a171c | 518 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
519 | continue; |
520 | ||
521 | orig_node = tmp_orig_node; | |
522 | break; | |
523 | } | |
524 | rcu_read_unlock(); | |
525 | ||
526 | return orig_node; | |
527 | } | |
528 | ||
1d8ab8d3 LL |
529 | /** |
530 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
531 | * @bat_priv: the bat priv with all the soft interface information | |
532 | * @skb: The multicast packet to check | |
533 | * @orig: an originator to be set to forward the skb to | |
534 | * | |
535 | * Returns the forwarding mode as enum batadv_forw_mode and in case of | |
536 | * BATADV_FORW_SINGLE set the orig to the single originator the skb | |
537 | * should be forwarded to. | |
538 | */ | |
539 | enum batadv_forw_mode | |
540 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
541 | struct batadv_orig_node **orig) | |
542 | { | |
4c8755d6 | 543 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 544 | bool is_unsnoopable = false; |
1d8ab8d3 | 545 | struct ethhdr *ethhdr; |
1d8ab8d3 | 546 | |
ab49886e | 547 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
548 | if (ret == -ENOMEM) |
549 | return BATADV_FORW_NONE; | |
550 | else if (ret < 0) | |
551 | return BATADV_FORW_ALL; | |
552 | ||
553 | ethhdr = eth_hdr(skb); | |
554 | ||
555 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
556 | BATADV_NO_FLAGS); | |
4c8755d6 | 557 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
558 | unsnoop_count = !is_unsnoopable ? 0 : |
559 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
560 | ||
4c8755d6 | 561 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 562 | |
ab49886e | 563 | switch (total_count) { |
1d8ab8d3 | 564 | case 1: |
ab49886e LL |
565 | if (tt_count) |
566 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
567 | else if (ip_count) |
568 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
569 | else if (unsnoop_count) |
570 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
571 | ||
1d8ab8d3 LL |
572 | if (*orig) |
573 | return BATADV_FORW_SINGLE; | |
574 | ||
575 | /* fall through */ | |
576 | case 0: | |
577 | return BATADV_FORW_NONE; | |
578 | default: | |
579 | return BATADV_FORW_ALL; | |
580 | } | |
581 | } | |
582 | ||
ab49886e LL |
583 | /** |
584 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
585 | * @bat_priv: the bat priv with all the soft interface information | |
586 | * @orig: the orig_node which multicast state might have changed of | |
587 | * @mcast_flags: flags indicating the new multicast state | |
588 | * | |
589 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
590 | * orig, has toggled then this method updates counter and list accordingly. | |
591 | */ | |
592 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
593 | struct batadv_orig_node *orig, | |
594 | uint8_t mcast_flags) | |
595 | { | |
596 | /* switched from flag unset to set */ | |
597 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
598 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
599 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
600 | ||
601 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
602 | hlist_add_head_rcu(&orig->mcast_want_all_unsnoopables_node, | |
603 | &bat_priv->mcast.want_all_unsnoopables_list); | |
604 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
605 | /* switched from flag set to unset */ | |
606 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
607 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
608 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
609 | ||
610 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
611 | hlist_del_rcu(&orig->mcast_want_all_unsnoopables_node); | |
612 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
613 | } | |
614 | } | |
615 | ||
4c8755d6 LL |
616 | /** |
617 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
618 | * @bat_priv: the bat priv with all the soft interface information | |
619 | * @orig: the orig_node which multicast state might have changed of | |
620 | * @mcast_flags: flags indicating the new multicast state | |
621 | * | |
622 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
623 | * toggled then this method updates counter and list accordingly. | |
624 | */ | |
625 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
626 | struct batadv_orig_node *orig, | |
627 | uint8_t mcast_flags) | |
628 | { | |
629 | /* switched from flag unset to set */ | |
630 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
631 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
632 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
633 | ||
634 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
635 | hlist_add_head_rcu(&orig->mcast_want_all_ipv4_node, | |
636 | &bat_priv->mcast.want_all_ipv4_list); | |
637 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
638 | /* switched from flag set to unset */ | |
639 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
640 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
641 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
642 | ||
643 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
644 | hlist_del_rcu(&orig->mcast_want_all_ipv4_node); | |
645 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
646 | } | |
647 | } | |
648 | ||
649 | /** | |
650 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
651 | * @bat_priv: the bat priv with all the soft interface information | |
652 | * @orig: the orig_node which multicast state might have changed of | |
653 | * @mcast_flags: flags indicating the new multicast state | |
654 | * | |
655 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
656 | * toggled then this method updates counter and list accordingly. | |
657 | */ | |
658 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
659 | struct batadv_orig_node *orig, | |
660 | uint8_t mcast_flags) | |
661 | { | |
662 | /* switched from flag unset to set */ | |
663 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
664 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
665 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
666 | ||
667 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
668 | hlist_add_head_rcu(&orig->mcast_want_all_ipv6_node, | |
669 | &bat_priv->mcast.want_all_ipv6_list); | |
670 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
671 | /* switched from flag set to unset */ | |
672 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
673 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
674 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
675 | ||
676 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
677 | hlist_del_rcu(&orig->mcast_want_all_ipv6_node); | |
678 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
679 | } | |
680 | } | |
681 | ||
60432d75 LL |
682 | /** |
683 | * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container | |
684 | * @bat_priv: the bat priv with all the soft interface information | |
685 | * @orig: the orig_node of the ogm | |
686 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
687 | * @tvlv_value: tvlv buffer containing the multicast data | |
688 | * @tvlv_value_len: tvlv buffer length | |
689 | */ | |
690 | static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
691 | struct batadv_orig_node *orig, | |
692 | uint8_t flags, | |
693 | void *tvlv_value, | |
694 | uint16_t tvlv_value_len) | |
695 | { | |
696 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
697 | uint8_t mcast_flags = BATADV_NO_FLAGS; | |
698 | bool orig_initialized; | |
699 | ||
700 | orig_initialized = orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST; | |
701 | ||
702 | /* If mcast support is turned on decrease the disabled mcast node | |
703 | * counter only if we had increased it for this node before. If this | |
704 | * is a completely new orig_node no need to decrease the counter. | |
705 | */ | |
706 | if (orig_mcast_enabled && | |
707 | !(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) { | |
708 | if (orig_initialized) | |
709 | atomic_dec(&bat_priv->mcast.num_disabled); | |
710 | orig->capabilities |= BATADV_ORIG_CAPA_HAS_MCAST; | |
e8829f00 LL |
711 | /* If mcast support is being switched off or if this is an initial |
712 | * OGM without mcast support then increase the disabled mcast | |
713 | * node counter. | |
60432d75 LL |
714 | */ |
715 | } else if (!orig_mcast_enabled && | |
e8829f00 LL |
716 | (orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST || |
717 | !orig_initialized)) { | |
60432d75 LL |
718 | atomic_inc(&bat_priv->mcast.num_disabled); |
719 | orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_MCAST; | |
720 | } | |
721 | ||
722 | orig->capa_initialized |= BATADV_ORIG_CAPA_HAS_MCAST; | |
723 | ||
724 | if (orig_mcast_enabled && tvlv_value && | |
725 | (tvlv_value_len >= sizeof(mcast_flags))) | |
726 | mcast_flags = *(uint8_t *)tvlv_value; | |
727 | ||
ab49886e | 728 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
729 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
730 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 731 | |
60432d75 LL |
732 | orig->mcast_flags = mcast_flags; |
733 | } | |
734 | ||
735 | /** | |
736 | * batadv_mcast_init - initialize the multicast optimizations structures | |
737 | * @bat_priv: the bat priv with all the soft interface information | |
738 | */ | |
739 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
740 | { | |
741 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, | |
742 | NULL, BATADV_TVLV_MCAST, 1, | |
743 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
744 | } | |
745 | ||
c5caf4ef LL |
746 | /** |
747 | * batadv_mcast_free - free the multicast optimizations structures | |
748 | * @bat_priv: the bat priv with all the soft interface information | |
749 | */ | |
750 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
751 | { | |
60432d75 LL |
752 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); |
753 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); | |
754 | ||
c5caf4ef LL |
755 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
756 | } | |
60432d75 LL |
757 | |
758 | /** | |
759 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
760 | * @orig: the originator which is going to get purged | |
761 | */ | |
762 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
763 | { | |
764 | struct batadv_priv *bat_priv = orig->bat_priv; | |
765 | ||
a5164886 LL |
766 | if (!(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST) && |
767 | orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST) | |
60432d75 | 768 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
769 | |
770 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
771 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
772 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
60432d75 | 773 | } |