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0046b040 | 1 | /* Copyright (C) 2014-2016 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 | * | |
62fe710f | 58 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
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 | * | |
62fe710f | 90 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
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 | * | |
62fe710f SE |
198 | * Checks whether there is a bridge on top of our soft interface. |
199 | * | |
200 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
201 | */ |
202 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
203 | { | |
204 | struct net_device *upper = bat_priv->soft_iface; | |
205 | ||
206 | rcu_read_lock(); | |
207 | do { | |
208 | upper = netdev_master_upper_dev_get_rcu(upper); | |
209 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
210 | rcu_read_unlock(); | |
211 | ||
212 | return upper; | |
213 | } | |
214 | ||
60432d75 LL |
215 | /** |
216 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
217 | * @bat_priv: the bat priv with all the soft interface information | |
218 | * | |
219 | * Updates the own multicast tvlv with our current multicast related settings, | |
220 | * capabilities and inabilities. | |
221 | * | |
62fe710f | 222 | * Return: true if the tvlv container is registered afterwards. Otherwise |
60432d75 LL |
223 | * returns false. |
224 | */ | |
225 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
226 | { | |
227 | struct batadv_tvlv_mcast_data mcast_data; | |
228 | ||
229 | mcast_data.flags = BATADV_NO_FLAGS; | |
230 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
231 | ||
232 | /* Avoid attaching MLAs, if there is a bridge on top of our soft | |
233 | * interface, we don't support that yet (TODO) | |
234 | */ | |
235 | if (batadv_mcast_has_bridge(bat_priv)) { | |
236 | if (bat_priv->mcast.enabled) { | |
237 | batadv_tvlv_container_unregister(bat_priv, | |
238 | BATADV_TVLV_MCAST, 1); | |
239 | bat_priv->mcast.enabled = false; | |
240 | } | |
241 | ||
242 | return false; | |
243 | } | |
244 | ||
245 | if (!bat_priv->mcast.enabled || | |
246 | mcast_data.flags != bat_priv->mcast.flags) { | |
247 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, | |
248 | &mcast_data, sizeof(mcast_data)); | |
249 | bat_priv->mcast.flags = mcast_data.flags; | |
250 | bat_priv->mcast.enabled = true; | |
251 | } | |
252 | ||
253 | return true; | |
254 | } | |
255 | ||
c5caf4ef LL |
256 | /** |
257 | * batadv_mcast_mla_update - update the own MLAs | |
258 | * @bat_priv: the bat priv with all the soft interface information | |
259 | * | |
60432d75 LL |
260 | * Updates the own multicast listener announcements in the translation |
261 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
262 | */ |
263 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
264 | { | |
265 | struct net_device *soft_iface = bat_priv->soft_iface; | |
266 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
267 | int ret; | |
268 | ||
60432d75 | 269 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
270 | goto update; |
271 | ||
272 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
273 | if (ret < 0) | |
274 | goto out; | |
275 | ||
276 | update: | |
277 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
278 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
279 | ||
280 | out: | |
2c72d655 | 281 | batadv_mcast_mla_list_free(bat_priv, &mcast_list); |
c5caf4ef LL |
282 | } |
283 | ||
ab49886e LL |
284 | /** |
285 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
286 | * @bat_priv: the bat priv with all the soft interface information | |
287 | * @skb: the IPv4 packet to check | |
288 | * @is_unsnoopable: stores whether the destination is snoopable | |
289 | * | |
290 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
291 | * mode more optimal than classic flooding. | |
292 | * | |
62fe710f SE |
293 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
294 | * allocation failure. | |
ab49886e LL |
295 | */ |
296 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
297 | struct sk_buff *skb, | |
298 | bool *is_unsnoopable) | |
299 | { | |
300 | struct iphdr *iphdr; | |
301 | ||
302 | /* We might fail due to out-of-memory -> drop it */ | |
303 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
304 | return -ENOMEM; | |
305 | ||
306 | iphdr = ip_hdr(skb); | |
307 | ||
308 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
309 | * then allow scope > link local, too | |
310 | */ | |
311 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
312 | return -EINVAL; | |
313 | ||
314 | /* link-local multicast listeners behind a bridge are | |
315 | * not snoopable (see RFC4541, section 2.1.2.2) | |
316 | */ | |
317 | *is_unsnoopable = true; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
1d8ab8d3 LL |
322 | /** |
323 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
324 | * @bat_priv: the bat priv with all the soft interface information | |
325 | * @skb: the IPv6 packet to check | |
ab49886e | 326 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
327 | * |
328 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
329 | * mode more optimal than classic flooding. | |
330 | * | |
62fe710f | 331 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
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 | * | |
62fe710f | 369 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
370 | */ |
371 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e LL |
372 | struct sk_buff *skb, |
373 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
374 | { |
375 | struct ethhdr *ethhdr = eth_hdr(skb); | |
376 | ||
377 | if (!atomic_read(&bat_priv->multicast_mode)) | |
378 | return -EINVAL; | |
379 | ||
380 | if (atomic_read(&bat_priv->mcast.num_disabled)) | |
381 | return -EINVAL; | |
382 | ||
383 | switch (ntohs(ethhdr->h_proto)) { | |
ab49886e LL |
384 | case ETH_P_IP: |
385 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
386 | is_unsnoopable); | |
1d8ab8d3 | 387 | case ETH_P_IPV6: |
ab49886e LL |
388 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
389 | is_unsnoopable); | |
1d8ab8d3 LL |
390 | default: |
391 | return -EINVAL; | |
392 | } | |
393 | } | |
394 | ||
4c8755d6 LL |
395 | /** |
396 | * batadv_mcast_want_all_ip_count - count nodes with unspecific mcast interest | |
397 | * @bat_priv: the bat priv with all the soft interface information | |
398 | * @ethhdr: ethernet header of a packet | |
399 | * | |
62fe710f | 400 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
401 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
402 | * IPv6 traffic if it matches an IPv6 packet. | |
403 | */ | |
404 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
405 | struct ethhdr *ethhdr) | |
406 | { | |
407 | switch (ntohs(ethhdr->h_proto)) { | |
408 | case ETH_P_IP: | |
409 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
410 | case ETH_P_IPV6: | |
411 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
412 | default: | |
413 | /* we shouldn't be here... */ | |
414 | return 0; | |
415 | } | |
416 | } | |
417 | ||
1d8ab8d3 LL |
418 | /** |
419 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
420 | * @bat_priv: the bat priv with all the soft interface information | |
421 | * @ethhdr: the ether header containing the multicast destination | |
422 | * | |
62fe710f | 423 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
424 | * via a translation table lookup. This increases the returned nodes refcount. |
425 | */ | |
426 | static struct batadv_orig_node * | |
427 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
428 | struct ethhdr *ethhdr) | |
429 | { | |
430 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
431 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
432 | } | |
433 | ||
4c8755d6 LL |
434 | /** |
435 | * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag | |
436 | * @bat_priv: the bat priv with all the soft interface information | |
437 | * | |
62fe710f | 438 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
439 | * increases its refcount. |
440 | */ | |
441 | static struct batadv_orig_node * | |
442 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
443 | { | |
444 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
445 | ||
446 | rcu_read_lock(); | |
447 | hlist_for_each_entry_rcu(tmp_orig_node, | |
448 | &bat_priv->mcast.want_all_ipv4_list, | |
449 | mcast_want_all_ipv4_node) { | |
af0a171c | 450 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
451 | continue; |
452 | ||
453 | orig_node = tmp_orig_node; | |
454 | break; | |
455 | } | |
456 | rcu_read_unlock(); | |
457 | ||
458 | return orig_node; | |
459 | } | |
460 | ||
461 | /** | |
462 | * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag | |
463 | * @bat_priv: the bat priv with all the soft interface information | |
464 | * | |
62fe710f | 465 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
466 | * and increases its refcount. |
467 | */ | |
468 | static struct batadv_orig_node * | |
469 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
470 | { | |
471 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
472 | ||
473 | rcu_read_lock(); | |
474 | hlist_for_each_entry_rcu(tmp_orig_node, | |
475 | &bat_priv->mcast.want_all_ipv6_list, | |
476 | mcast_want_all_ipv6_node) { | |
af0a171c | 477 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
478 | continue; |
479 | ||
480 | orig_node = tmp_orig_node; | |
481 | break; | |
482 | } | |
483 | rcu_read_unlock(); | |
484 | ||
485 | return orig_node; | |
486 | } | |
487 | ||
488 | /** | |
489 | * batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag | |
490 | * @bat_priv: the bat priv with all the soft interface information | |
491 | * @ethhdr: an ethernet header to determine the protocol family from | |
492 | * | |
62fe710f | 493 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
494 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
495 | * increases its refcount. | |
496 | */ | |
497 | static struct batadv_orig_node * | |
498 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
499 | struct ethhdr *ethhdr) | |
500 | { | |
501 | switch (ntohs(ethhdr->h_proto)) { | |
502 | case ETH_P_IP: | |
503 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
504 | case ETH_P_IPV6: | |
505 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
506 | default: | |
507 | /* we shouldn't be here... */ | |
508 | return NULL; | |
509 | } | |
510 | } | |
511 | ||
ab49886e LL |
512 | /** |
513 | * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag | |
514 | * @bat_priv: the bat priv with all the soft interface information | |
515 | * | |
62fe710f | 516 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
517 | * set and increases its refcount. |
518 | */ | |
519 | static struct batadv_orig_node * | |
520 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
521 | { | |
522 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
523 | ||
524 | rcu_read_lock(); | |
525 | hlist_for_each_entry_rcu(tmp_orig_node, | |
526 | &bat_priv->mcast.want_all_unsnoopables_list, | |
527 | mcast_want_all_unsnoopables_node) { | |
af0a171c | 528 | if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
529 | continue; |
530 | ||
531 | orig_node = tmp_orig_node; | |
532 | break; | |
533 | } | |
534 | rcu_read_unlock(); | |
535 | ||
536 | return orig_node; | |
537 | } | |
538 | ||
1d8ab8d3 LL |
539 | /** |
540 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
541 | * @bat_priv: the bat priv with all the soft interface information | |
542 | * @skb: The multicast packet to check | |
543 | * @orig: an originator to be set to forward the skb to | |
544 | * | |
62fe710f | 545 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
546 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
547 | * should be forwarded to. | |
548 | */ | |
549 | enum batadv_forw_mode | |
550 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
551 | struct batadv_orig_node **orig) | |
552 | { | |
4c8755d6 | 553 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 554 | bool is_unsnoopable = false; |
1d8ab8d3 | 555 | struct ethhdr *ethhdr; |
1d8ab8d3 | 556 | |
ab49886e | 557 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
558 | if (ret == -ENOMEM) |
559 | return BATADV_FORW_NONE; | |
560 | else if (ret < 0) | |
561 | return BATADV_FORW_ALL; | |
562 | ||
563 | ethhdr = eth_hdr(skb); | |
564 | ||
565 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
566 | BATADV_NO_FLAGS); | |
4c8755d6 | 567 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
568 | unsnoop_count = !is_unsnoopable ? 0 : |
569 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
570 | ||
4c8755d6 | 571 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 572 | |
ab49886e | 573 | switch (total_count) { |
1d8ab8d3 | 574 | case 1: |
ab49886e LL |
575 | if (tt_count) |
576 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
577 | else if (ip_count) |
578 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
579 | else if (unsnoop_count) |
580 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
581 | ||
1d8ab8d3 LL |
582 | if (*orig) |
583 | return BATADV_FORW_SINGLE; | |
584 | ||
585 | /* fall through */ | |
586 | case 0: | |
587 | return BATADV_FORW_NONE; | |
588 | default: | |
589 | return BATADV_FORW_ALL; | |
590 | } | |
591 | } | |
592 | ||
ab49886e LL |
593 | /** |
594 | * batadv_mcast_want_unsnoop_update - update unsnoop 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_UNSNOOPABLES flag of this originator, | |
600 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
601 | * |
602 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
603 | */ |
604 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
605 | struct batadv_orig_node *orig, | |
6b5e971a | 606 | u8 mcast_flags) |
ab49886e | 607 | { |
8a4023c5 LL |
608 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
609 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
610 | ||
5274cd68 SE |
611 | lockdep_assert_held(&orig->mcast_handler_lock); |
612 | ||
ab49886e LL |
613 | /* switched from flag unset to set */ |
614 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
615 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
616 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
617 | ||
618 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
619 | /* flag checks above + mcast_handler_lock prevents this */ |
620 | WARN_ON(!hlist_unhashed(node)); | |
621 | ||
622 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
623 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
624 | /* switched from flag set to unset */ | |
625 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
626 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
627 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
628 | ||
629 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
630 | /* flag checks above + mcast_handler_lock prevents this */ |
631 | WARN_ON(hlist_unhashed(node)); | |
632 | ||
633 | hlist_del_init_rcu(node); | |
ab49886e LL |
634 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
635 | } | |
636 | } | |
637 | ||
4c8755d6 LL |
638 | /** |
639 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
640 | * @bat_priv: the bat priv with all the soft interface information | |
641 | * @orig: the orig_node which multicast state might have changed of | |
642 | * @mcast_flags: flags indicating the new multicast state | |
643 | * | |
644 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
645 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
646 | * |
647 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
648 | */ |
649 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
650 | struct batadv_orig_node *orig, | |
6b5e971a | 651 | u8 mcast_flags) |
4c8755d6 | 652 | { |
8a4023c5 LL |
653 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
654 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
655 | ||
5274cd68 SE |
656 | lockdep_assert_held(&orig->mcast_handler_lock); |
657 | ||
4c8755d6 LL |
658 | /* switched from flag unset to set */ |
659 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
660 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
661 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
662 | ||
663 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
664 | /* flag checks above + mcast_handler_lock prevents this */ |
665 | WARN_ON(!hlist_unhashed(node)); | |
666 | ||
667 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
668 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
669 | /* switched from flag set to unset */ | |
670 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
671 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
672 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
673 | ||
674 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
675 | /* flag checks above + mcast_handler_lock prevents this */ |
676 | WARN_ON(hlist_unhashed(node)); | |
677 | ||
678 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
679 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
680 | } | |
681 | } | |
682 | ||
683 | /** | |
684 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
685 | * @bat_priv: the bat priv with all the soft interface information | |
686 | * @orig: the orig_node which multicast state might have changed of | |
687 | * @mcast_flags: flags indicating the new multicast state | |
688 | * | |
689 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
690 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
691 | * |
692 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
693 | */ |
694 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
695 | struct batadv_orig_node *orig, | |
6b5e971a | 696 | u8 mcast_flags) |
4c8755d6 | 697 | { |
8a4023c5 LL |
698 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
699 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
700 | ||
5274cd68 SE |
701 | lockdep_assert_held(&orig->mcast_handler_lock); |
702 | ||
4c8755d6 LL |
703 | /* switched from flag unset to set */ |
704 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
705 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
706 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
707 | ||
708 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
709 | /* flag checks above + mcast_handler_lock prevents this */ |
710 | WARN_ON(!hlist_unhashed(node)); | |
711 | ||
712 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
713 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
714 | /* switched from flag set to unset */ | |
715 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
716 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
717 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
718 | ||
719 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
720 | /* flag checks above + mcast_handler_lock prevents this */ |
721 | WARN_ON(hlist_unhashed(node)); | |
722 | ||
723 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
724 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
725 | } | |
726 | } | |
727 | ||
60432d75 LL |
728 | /** |
729 | * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container | |
730 | * @bat_priv: the bat priv with all the soft interface information | |
731 | * @orig: the orig_node of the ogm | |
732 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
733 | * @tvlv_value: tvlv buffer containing the multicast data | |
734 | * @tvlv_value_len: tvlv buffer length | |
735 | */ | |
736 | static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
737 | struct batadv_orig_node *orig, | |
6b5e971a | 738 | u8 flags, |
60432d75 | 739 | void *tvlv_value, |
6b5e971a | 740 | u16 tvlv_value_len) |
60432d75 LL |
741 | { |
742 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 743 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
744 | bool orig_initialized; |
745 | ||
8a4023c5 LL |
746 | if (orig_mcast_enabled && tvlv_value && |
747 | (tvlv_value_len >= sizeof(mcast_flags))) | |
6b5e971a | 748 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
749 | |
750 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
751 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
752 | &orig->capa_initialized); | |
60432d75 LL |
753 | |
754 | /* If mcast support is turned on decrease the disabled mcast node | |
755 | * counter only if we had increased it for this node before. If this | |
756 | * is a completely new orig_node no need to decrease the counter. | |
757 | */ | |
758 | if (orig_mcast_enabled && | |
9c936e3f | 759 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
760 | if (orig_initialized) |
761 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 762 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
763 | /* If mcast support is being switched off or if this is an initial |
764 | * OGM without mcast support then increase the disabled mcast | |
765 | * node counter. | |
60432d75 LL |
766 | */ |
767 | } else if (!orig_mcast_enabled && | |
9c936e3f | 768 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 769 | !orig_initialized)) { |
60432d75 | 770 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 771 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
772 | } |
773 | ||
9c936e3f | 774 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 775 | |
ab49886e | 776 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
777 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
778 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 779 | |
60432d75 | 780 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 781 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
782 | } |
783 | ||
784 | /** | |
785 | * batadv_mcast_init - initialize the multicast optimizations structures | |
786 | * @bat_priv: the bat priv with all the soft interface information | |
787 | */ | |
788 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
789 | { | |
790 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, | |
791 | NULL, BATADV_TVLV_MCAST, 1, | |
792 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
793 | } | |
794 | ||
c5caf4ef LL |
795 | /** |
796 | * batadv_mcast_free - free the multicast optimizations structures | |
797 | * @bat_priv: the bat priv with all the soft interface information | |
798 | */ | |
799 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
800 | { | |
60432d75 LL |
801 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); |
802 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); | |
803 | ||
af63cf51 | 804 | spin_lock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 805 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
af63cf51 | 806 | spin_unlock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 807 | } |
60432d75 LL |
808 | |
809 | /** | |
810 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
811 | * @orig: the originator which is going to get purged | |
812 | */ | |
813 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
814 | { | |
815 | struct batadv_priv *bat_priv = orig->bat_priv; | |
816 | ||
8a4023c5 LL |
817 | spin_lock_bh(&orig->mcast_handler_lock); |
818 | ||
9c936e3f LL |
819 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
820 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 821 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
822 | |
823 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
824 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
825 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
826 | |
827 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 828 | } |