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> | |
9c936e3f | 22 | #include <linux/bitops.h> |
8a4023c5 | 23 | #include <linux/bug.h> |
1e2c2a4f SE |
24 | #include <linux/byteorder/generic.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/list.h> | |
2c72d655 | 34 | #include <linux/lockdep.h> |
1e2c2a4f SE |
35 | #include <linux/netdevice.h> |
36 | #include <linux/rculist.h> | |
37 | #include <linux/rcupdate.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/spinlock.h> | |
41 | #include <linux/stddef.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/types.h> | |
44 | #include <net/addrconf.h> | |
45 | #include <net/ipv6.h> | |
46 | ||
47 | #include "packet.h" | |
c5caf4ef LL |
48 | #include "translation-table.h" |
49 | ||
50 | /** | |
51 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
52 | * @dev: the device to collect multicast addresses from | |
53 | * @mcast_list: a list to put found addresses into | |
54 | * | |
55 | * Collect multicast addresses of the local multicast listeners | |
56 | * on the given soft interface, dev, in the given mcast_list. | |
57 | * | |
58 | * Returns -ENOMEM on memory allocation error or the number of | |
59 | * items added to the mcast_list otherwise. | |
60 | */ | |
61 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
62 | struct hlist_head *mcast_list) | |
63 | { | |
64 | struct netdev_hw_addr *mc_list_entry; | |
65 | struct batadv_hw_addr *new; | |
66 | int ret = 0; | |
67 | ||
68 | netif_addr_lock_bh(dev); | |
69 | netdev_for_each_mc_addr(mc_list_entry, dev) { | |
70 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
71 | if (!new) { | |
72 | ret = -ENOMEM; | |
73 | break; | |
74 | } | |
75 | ||
76 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
77 | hlist_add_head(&new->list, mcast_list); | |
78 | ret++; | |
79 | } | |
80 | netif_addr_unlock_bh(dev); | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
85 | /** | |
86 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
87 | * @mcast_addr: the multicast address to check | |
88 | * @mcast_list: the list with multicast addresses to search in | |
89 | * | |
90 | * Returns true if the given address is already in the given list. | |
91 | * Otherwise returns false. | |
92 | */ | |
6b5e971a | 93 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
94 | struct hlist_head *mcast_list) |
95 | { | |
96 | struct batadv_hw_addr *mcast_entry; | |
97 | ||
98 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
99 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
100 | return true; | |
101 | ||
102 | return false; | |
103 | } | |
104 | ||
105 | /** | |
106 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
2c72d655 | 107 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
108 | * @mcast_list: the list to free |
109 | * | |
110 | * Removes and frees all items in the given mcast_list. | |
111 | */ | |
2c72d655 SE |
112 | static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv, |
113 | struct hlist_head *mcast_list) | |
c5caf4ef LL |
114 | { |
115 | struct batadv_hw_addr *mcast_entry; | |
116 | struct hlist_node *tmp; | |
117 | ||
2c72d655 SE |
118 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
119 | ||
c5caf4ef LL |
120 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
121 | hlist_del(&mcast_entry->list); | |
122 | kfree(mcast_entry); | |
123 | } | |
124 | } | |
125 | ||
126 | /** | |
127 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
128 | * @bat_priv: the bat priv with all the soft interface information | |
129 | * @mcast_list: a list of addresses which should _not_ be removed | |
130 | * | |
131 | * Retracts the announcement of any multicast listener from the | |
132 | * translation table except the ones listed in the given mcast_list. | |
133 | * | |
134 | * If mcast_list is NULL then all are retracted. | |
135 | */ | |
136 | static void batadv_mcast_mla_tt_retract(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 | ||
2c72d655 SE |
142 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
143 | ||
c5caf4ef LL |
144 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
145 | list) { | |
146 | if (mcast_list && | |
147 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
148 | mcast_list)) | |
149 | continue; | |
150 | ||
151 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
152 | BATADV_NO_FLAGS, | |
153 | "mcast TT outdated", false); | |
154 | ||
155 | hlist_del(&mcast_entry->list); | |
156 | kfree(mcast_entry); | |
157 | } | |
158 | } | |
159 | ||
160 | /** | |
161 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
162 | * @bat_priv: the bat priv with all the soft interface information | |
163 | * @mcast_list: a list of addresses which are going to get added | |
164 | * | |
165 | * Adds multicast listener announcements from the given mcast_list to the | |
166 | * translation table if they have not been added yet. | |
167 | */ | |
168 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
169 | struct hlist_head *mcast_list) | |
170 | { | |
171 | struct batadv_hw_addr *mcast_entry; | |
172 | struct hlist_node *tmp; | |
173 | ||
2c72d655 SE |
174 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
175 | ||
c5caf4ef LL |
176 | if (!mcast_list) |
177 | return; | |
178 | ||
179 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
180 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
181 | &bat_priv->mcast.mla_list)) | |
182 | continue; | |
183 | ||
184 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
185 | mcast_entry->addr, BATADV_NO_FLAGS, | |
186 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
187 | continue; | |
188 | ||
189 | hlist_del(&mcast_entry->list); | |
190 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
191 | } | |
192 | } | |
193 | ||
194 | /** | |
195 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
196 | * @bat_priv: the bat priv with all the soft interface information | |
197 | * | |
198 | * Checks whether there is a bridge on top of our soft interface. Returns | |
199 | * true if so, false otherwise. | |
200 | */ | |
201 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
202 | { | |
203 | struct net_device *upper = bat_priv->soft_iface; | |
204 | ||
205 | rcu_read_lock(); | |
206 | do { | |
207 | upper = netdev_master_upper_dev_get_rcu(upper); | |
208 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
209 | rcu_read_unlock(); | |
210 | ||
211 | return upper; | |
212 | } | |
213 | ||
60432d75 LL |
214 | /** |
215 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
216 | * @bat_priv: the bat priv with all the soft interface information | |
217 | * | |
218 | * Updates the own multicast tvlv with our current multicast related settings, | |
219 | * capabilities and inabilities. | |
220 | * | |
221 | * Returns true if the tvlv container is registered afterwards. Otherwise | |
222 | * returns false. | |
223 | */ | |
224 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
225 | { | |
226 | struct batadv_tvlv_mcast_data mcast_data; | |
227 | ||
228 | mcast_data.flags = BATADV_NO_FLAGS; | |
229 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
230 | ||
231 | /* Avoid attaching MLAs, if there is a bridge on top of our soft | |
232 | * interface, we don't support that yet (TODO) | |
233 | */ | |
234 | if (batadv_mcast_has_bridge(bat_priv)) { | |
235 | if (bat_priv->mcast.enabled) { | |
236 | batadv_tvlv_container_unregister(bat_priv, | |
237 | BATADV_TVLV_MCAST, 1); | |
238 | bat_priv->mcast.enabled = false; | |
239 | } | |
240 | ||
241 | return false; | |
242 | } | |
243 | ||
244 | if (!bat_priv->mcast.enabled || | |
245 | mcast_data.flags != bat_priv->mcast.flags) { | |
246 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, | |
247 | &mcast_data, sizeof(mcast_data)); | |
248 | bat_priv->mcast.flags = mcast_data.flags; | |
249 | bat_priv->mcast.enabled = true; | |
250 | } | |
251 | ||
252 | return true; | |
253 | } | |
254 | ||
c5caf4ef LL |
255 | /** |
256 | * batadv_mcast_mla_update - update the own MLAs | |
257 | * @bat_priv: the bat priv with all the soft interface information | |
258 | * | |
60432d75 LL |
259 | * Updates the own multicast listener announcements in the translation |
260 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
261 | */ |
262 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
263 | { | |
264 | struct net_device *soft_iface = bat_priv->soft_iface; | |
265 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
266 | int ret; | |
267 | ||
60432d75 | 268 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
269 | goto update; |
270 | ||
271 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
272 | if (ret < 0) | |
273 | goto out; | |
274 | ||
275 | update: | |
276 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
277 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
278 | ||
279 | out: | |
2c72d655 | 280 | batadv_mcast_mla_list_free(bat_priv, &mcast_list); |
c5caf4ef LL |
281 | } |
282 | ||
ab49886e LL |
283 | /** |
284 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
285 | * @bat_priv: the bat priv with all the soft interface information | |
286 | * @skb: the IPv4 packet to check | |
287 | * @is_unsnoopable: stores whether the destination is snoopable | |
288 | * | |
289 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
290 | * mode more optimal than classic flooding. | |
291 | * | |
292 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM in case of | |
293 | * memory allocation failure. | |
294 | */ | |
295 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
296 | struct sk_buff *skb, | |
297 | bool *is_unsnoopable) | |
298 | { | |
299 | struct iphdr *iphdr; | |
300 | ||
301 | /* We might fail due to out-of-memory -> drop it */ | |
302 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
303 | return -ENOMEM; | |
304 | ||
305 | iphdr = ip_hdr(skb); | |
306 | ||
307 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
308 | * then allow scope > link local, too | |
309 | */ | |
310 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
311 | return -EINVAL; | |
312 | ||
313 | /* link-local multicast listeners behind a bridge are | |
314 | * not snoopable (see RFC4541, section 2.1.2.2) | |
315 | */ | |
316 | *is_unsnoopable = true; | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
1d8ab8d3 LL |
321 | /** |
322 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
323 | * @bat_priv: the bat priv with all the soft interface information | |
324 | * @skb: the IPv6 packet to check | |
ab49886e | 325 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
326 | * |
327 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
328 | * mode more optimal than classic flooding. | |
329 | * | |
330 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
331 | * of memory. | |
332 | */ | |
333 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
334 | struct sk_buff *skb, |
335 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
336 | { |
337 | struct ipv6hdr *ip6hdr; | |
338 | ||
339 | /* We might fail due to out-of-memory -> drop it */ | |
340 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
341 | return -ENOMEM; | |
342 | ||
343 | ip6hdr = ipv6_hdr(skb); | |
344 | ||
345 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
346 | * then allow scope > link local, too | |
347 | */ | |
348 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
349 | return -EINVAL; | |
350 | ||
351 | /* link-local-all-nodes multicast listeners behind a bridge are | |
352 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
353 | */ | |
354 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 355 | *is_unsnoopable = true; |
1d8ab8d3 LL |
356 | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /** | |
361 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
362 | * @bat_priv: the bat priv with all the soft interface information | |
363 | * @skb: the multicast frame to check | |
ab49886e | 364 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
365 | * |
366 | * Checks whether the given multicast ethernet frame has the potential to be | |
367 | * forwarded with a mode more optimal than classic flooding. | |
368 | * | |
369 | * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out | |
370 | * of memory. | |
371 | */ | |
372 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
373 | struct sk_buff *skb, |
374 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
375 | { |
376 | struct ethhdr *ethhdr = eth_hdr(skb); | |
377 | ||
378 | if (!atomic_read(&bat_priv->multicast_mode)) | |
379 | return -EINVAL; | |
380 | ||
381 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
382 | return -EINVAL; | |
383 | ||
384 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
385 | case ETH_P_IP: |
386 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
387 | is_unsnoopable); | |
1d8ab8d3 | 388 | case ETH_P_IPV6: |
ab49886e LL |
389 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
390 | is_unsnoopable); | |
1d8ab8d3 LL |
391 | default: |
392 | return -EINVAL; | |
393 | } | |
394 | } | |
395 | ||
4c8755d6 LL |
396 | /** |
397 | * batadv_mcast_want_all_ip_count - count nodes with unspecific mcast interest | |
398 | * @bat_priv: the bat priv with all the soft interface information | |
399 | * @ethhdr: ethernet header of a packet | |
400 | * | |
401 | * Returns the number of nodes which want all IPv4 multicast traffic if the | |
402 | * given ethhdr is from an IPv4 packet or the number of nodes which want all | |
403 | * IPv6 traffic if it matches an IPv6 packet. | |
404 | */ | |
405 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
406 | struct ethhdr *ethhdr) | |
407 | { | |
408 | switch (ntohs(ethhdr->h_proto)) { | |
409 | case ETH_P_IP: | |
410 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
411 | case ETH_P_IPV6: | |
412 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
413 | default: | |
414 | /* we shouldn't be here... */ | |
415 | return 0; | |
416 | } | |
417 | } | |
418 | ||
1d8ab8d3 LL |
419 | /** |
420 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
421 | * @bat_priv: the bat priv with all the soft interface information | |
422 | * @ethhdr: the ether header containing the multicast destination | |
423 | * | |
424 | * Returns an orig_node matching the multicast address provided by ethhdr | |
425 | * via a translation table lookup. This increases the returned nodes refcount. | |
426 | */ | |
427 | static struct batadv_orig_node * | |
428 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
429 | struct ethhdr *ethhdr) | |
430 | { | |
431 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
432 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
433 | } | |
434 | ||
4c8755d6 LL |
435 | /** |
436 | * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag | |
437 | * @bat_priv: the bat priv with all the soft interface information | |
438 | * | |
439 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and | |
440 | * increases its refcount. | |
441 | */ | |
442 | static struct batadv_orig_node * | |
443 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
444 | { | |
445 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
446 | ||
447 | rcu_read_lock(); | |
448 | hlist_for_each_entry_rcu(tmp_orig_node, | |
449 | &bat_priv->mcast.want_all_ipv4_list, | |
450 | mcast_want_all_ipv4_node) { | |
af0a171c | 451 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
452 | continue; |
453 | ||
454 | orig_node = tmp_orig_node; | |
455 | break; | |
456 | } | |
457 | rcu_read_unlock(); | |
458 | ||
459 | return orig_node; | |
460 | } | |
461 | ||
462 | /** | |
463 | * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag | |
464 | * @bat_priv: the bat priv with all the soft interface information | |
465 | * | |
466 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set | |
467 | * and increases its refcount. | |
468 | */ | |
469 | static struct batadv_orig_node * | |
470 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
471 | { | |
472 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
473 | ||
474 | rcu_read_lock(); | |
475 | hlist_for_each_entry_rcu(tmp_orig_node, | |
476 | &bat_priv->mcast.want_all_ipv6_list, | |
477 | mcast_want_all_ipv6_node) { | |
af0a171c | 478 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
479 | continue; |
480 | ||
481 | orig_node = tmp_orig_node; | |
482 | break; | |
483 | } | |
484 | rcu_read_unlock(); | |
485 | ||
486 | return orig_node; | |
487 | } | |
488 | ||
489 | /** | |
490 | * batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag | |
491 | * @bat_priv: the bat priv with all the soft interface information | |
492 | * @ethhdr: an ethernet header to determine the protocol family from | |
493 | * | |
494 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or | |
495 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and | |
496 | * increases its refcount. | |
497 | */ | |
498 | static struct batadv_orig_node * | |
499 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
500 | struct ethhdr *ethhdr) | |
501 | { | |
502 | switch (ntohs(ethhdr->h_proto)) { | |
503 | case ETH_P_IP: | |
504 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
505 | case ETH_P_IPV6: | |
506 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
507 | default: | |
508 | /* we shouldn't be here... */ | |
509 | return NULL; | |
510 | } | |
511 | } | |
512 | ||
ab49886e LL |
513 | /** |
514 | * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag | |
515 | * @bat_priv: the bat priv with all the soft interface information | |
516 | * | |
517 | * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag | |
518 | * set and increases its refcount. | |
519 | */ | |
520 | static struct batadv_orig_node * | |
521 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
522 | { | |
523 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
524 | ||
525 | rcu_read_lock(); | |
526 | hlist_for_each_entry_rcu(tmp_orig_node, | |
527 | &bat_priv->mcast.want_all_unsnoopables_list, | |
528 | mcast_want_all_unsnoopables_node) { | |
af0a171c | 529 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
530 | continue; |
531 | ||
532 | orig_node = tmp_orig_node; | |
533 | break; | |
534 | } | |
535 | rcu_read_unlock(); | |
536 | ||
537 | return orig_node; | |
538 | } | |
539 | ||
1d8ab8d3 LL |
540 | /** |
541 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
542 | * @bat_priv: the bat priv with all the soft interface information | |
543 | * @skb: The multicast packet to check | |
544 | * @orig: an originator to be set to forward the skb to | |
545 | * | |
546 | * Returns the forwarding mode as enum batadv_forw_mode and in case of | |
547 | * BATADV_FORW_SINGLE set the orig to the single originator the skb | |
548 | * should be forwarded to. | |
549 | */ | |
550 | enum batadv_forw_mode | |
551 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
552 | struct batadv_orig_node **orig) | |
553 | { | |
4c8755d6 | 554 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 555 | bool is_unsnoopable = false; |
1d8ab8d3 | 556 | struct ethhdr *ethhdr; |
1d8ab8d3 | 557 | |
ab49886e | 558 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
559 | if (ret == -ENOMEM) |
560 | return BATADV_FORW_NONE; | |
561 | else if (ret < 0) | |
562 | return BATADV_FORW_ALL; | |
563 | ||
564 | ethhdr = eth_hdr(skb); | |
565 | ||
566 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
567 | BATADV_NO_FLAGS); | |
4c8755d6 | 568 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
569 | unsnoop_count = !is_unsnoopable ? 0 : |
570 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
571 | ||
4c8755d6 | 572 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 573 | |
ab49886e | 574 | switch (total_count) { |
1d8ab8d3 | 575 | case 1: |
ab49886e LL |
576 | if (tt_count) |
577 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
578 | else if (ip_count) |
579 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
580 | else if (unsnoop_count) |
581 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
582 | ||
1d8ab8d3 LL |
583 | if (*orig) |
584 | return BATADV_FORW_SINGLE; | |
585 | ||
586 | /* fall through */ | |
587 | case 0: | |
588 | return BATADV_FORW_NONE; | |
589 | default: | |
590 | return BATADV_FORW_ALL; | |
591 | } | |
592 | } | |
593 | ||
ab49886e LL |
594 | /** |
595 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
596 | * @bat_priv: the bat priv with all the soft interface information | |
597 | * @orig: the orig_node which multicast state might have changed of | |
598 | * @mcast_flags: flags indicating the new multicast state | |
599 | * | |
600 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
601 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
602 | * |
603 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
604 | */ |
605 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
606 | struct batadv_orig_node *orig, | |
6b5e971a | 607 | u8 mcast_flags) |
ab49886e | 608 | { |
8a4023c5 LL |
609 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
610 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
611 | ||
5274cd68 SE |
612 | lockdep_assert_held(&orig->mcast_handler_lock); |
613 | ||
ab49886e LL |
614 | /* switched from flag unset to set */ |
615 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
616 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
617 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
618 | ||
619 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
620 | /* flag checks above + mcast_handler_lock prevents this */ |
621 | WARN_ON(!hlist_unhashed(node)); | |
622 | ||
623 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
624 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
625 | /* switched from flag set to unset */ | |
626 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
627 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
628 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
629 | ||
630 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
631 | /* flag checks above + mcast_handler_lock prevents this */ |
632 | WARN_ON(hlist_unhashed(node)); | |
633 | ||
634 | hlist_del_init_rcu(node); | |
ab49886e LL |
635 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
636 | } | |
637 | } | |
638 | ||
4c8755d6 LL |
639 | /** |
640 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
641 | * @bat_priv: the bat priv with all the soft interface information | |
642 | * @orig: the orig_node which multicast state might have changed of | |
643 | * @mcast_flags: flags indicating the new multicast state | |
644 | * | |
645 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
646 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
647 | * |
648 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
649 | */ |
650 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
651 | struct batadv_orig_node *orig, | |
6b5e971a | 652 | u8 mcast_flags) |
4c8755d6 | 653 | { |
8a4023c5 LL |
654 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
655 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
656 | ||
5274cd68 SE |
657 | lockdep_assert_held(&orig->mcast_handler_lock); |
658 | ||
4c8755d6 LL |
659 | /* switched from flag unset to set */ |
660 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
661 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
662 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
663 | ||
664 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
665 | /* flag checks above + mcast_handler_lock prevents this */ |
666 | WARN_ON(!hlist_unhashed(node)); | |
667 | ||
668 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
669 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
670 | /* switched from flag set to unset */ | |
671 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
672 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
673 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
674 | ||
675 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
676 | /* flag checks above + mcast_handler_lock prevents this */ |
677 | WARN_ON(hlist_unhashed(node)); | |
678 | ||
679 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
680 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
681 | } | |
682 | } | |
683 | ||
684 | /** | |
685 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
686 | * @bat_priv: the bat priv with all the soft interface information | |
687 | * @orig: the orig_node which multicast state might have changed of | |
688 | * @mcast_flags: flags indicating the new multicast state | |
689 | * | |
690 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
691 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
692 | * |
693 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
694 | */ |
695 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
696 | struct batadv_orig_node *orig, | |
6b5e971a | 697 | u8 mcast_flags) |
4c8755d6 | 698 | { |
8a4023c5 LL |
699 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
700 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
701 | ||
5274cd68 SE |
702 | lockdep_assert_held(&orig->mcast_handler_lock); |
703 | ||
4c8755d6 LL |
704 | /* switched from flag unset to set */ |
705 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
706 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
707 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
708 | ||
709 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
710 | /* flag checks above + mcast_handler_lock prevents this */ |
711 | WARN_ON(!hlist_unhashed(node)); | |
712 | ||
713 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
714 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
715 | /* switched from flag set to unset */ | |
716 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
717 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
718 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
719 | ||
720 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
721 | /* flag checks above + mcast_handler_lock prevents this */ |
722 | WARN_ON(hlist_unhashed(node)); | |
723 | ||
724 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
725 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
726 | } | |
727 | } | |
728 | ||
60432d75 LL |
729 | /** |
730 | * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container | |
731 | * @bat_priv: the bat priv with all the soft interface information | |
732 | * @orig: the orig_node of the ogm | |
733 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
734 | * @tvlv_value: tvlv buffer containing the multicast data | |
735 | * @tvlv_value_len: tvlv buffer length | |
736 | */ | |
737 | static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
738 | struct batadv_orig_node *orig, | |
6b5e971a | 739 | u8 flags, |
60432d75 | 740 | void *tvlv_value, |
6b5e971a | 741 | u16 tvlv_value_len) |
60432d75 LL |
742 | { |
743 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 744 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
745 | bool orig_initialized; |
746 | ||
8a4023c5 LL |
747 | if (orig_mcast_enabled && tvlv_value && |
748 | (tvlv_value_len >= sizeof(mcast_flags))) | |
6b5e971a | 749 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
750 | |
751 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
752 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
753 | &orig->capa_initialized); | |
60432d75 LL |
754 | |
755 | /* If mcast support is turned on decrease the disabled mcast node | |
756 | * counter only if we had increased it for this node before. If this | |
757 | * is a completely new orig_node no need to decrease the counter. | |
758 | */ | |
759 | if (orig_mcast_enabled && | |
9c936e3f | 760 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
761 | if (orig_initialized) |
762 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 763 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
764 | /* If mcast support is being switched off or if this is an initial |
765 | * OGM without mcast support then increase the disabled mcast | |
766 | * node counter. | |
60432d75 LL |
767 | */ |
768 | } else if (!orig_mcast_enabled && | |
9c936e3f | 769 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 770 | !orig_initialized)) { |
60432d75 | 771 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 772 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
773 | } |
774 | ||
9c936e3f | 775 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 776 | |
ab49886e | 777 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
778 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
779 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 780 | |
60432d75 | 781 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 782 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
783 | } |
784 | ||
785 | /** | |
786 | * batadv_mcast_init - initialize the multicast optimizations structures | |
787 | * @bat_priv: the bat priv with all the soft interface information | |
788 | */ | |
789 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
790 | { | |
791 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, | |
792 | NULL, BATADV_TVLV_MCAST, 1, | |
793 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
794 | } | |
795 | ||
c5caf4ef LL |
796 | /** |
797 | * batadv_mcast_free - free the multicast optimizations structures | |
798 | * @bat_priv: the bat priv with all the soft interface information | |
799 | */ | |
800 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
801 | { | |
60432d75 LL |
802 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); |
803 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); | |
804 | ||
c5caf4ef LL |
805 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
806 | } | |
60432d75 LL |
807 | |
808 | /** | |
809 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
810 | * @orig: the originator which is going to get purged | |
811 | */ | |
812 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
813 | { | |
814 | struct batadv_priv *bat_priv = orig->bat_priv; | |
815 | ||
8a4023c5 LL |
816 | spin_lock_bh(&orig->mcast_handler_lock); |
817 | ||
9c936e3f LL |
818 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
819 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 820 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
821 | |
822 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
823 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
824 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
825 | |
826 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 827 | } |