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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> | |
7c124391 | 33 | #include <linux/kref.h> |
1e2c2a4f | 34 | #include <linux/list.h> |
2c72d655 | 35 | #include <linux/lockdep.h> |
1e2c2a4f SE |
36 | #include <linux/netdevice.h> |
37 | #include <linux/rculist.h> | |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/skbuff.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/spinlock.h> | |
42 | #include <linux/stddef.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/types.h> | |
45 | #include <net/addrconf.h> | |
46 | #include <net/ipv6.h> | |
47 | ||
48 | #include "packet.h" | |
c5caf4ef LL |
49 | #include "translation-table.h" |
50 | ||
51 | /** | |
52 | * batadv_mcast_mla_softif_get - get softif multicast listeners | |
53 | * @dev: the device to collect multicast addresses from | |
54 | * @mcast_list: a list to put found addresses into | |
55 | * | |
56 | * Collect multicast addresses of the local multicast listeners | |
57 | * on the given soft interface, dev, in the given mcast_list. | |
58 | * | |
62fe710f | 59 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
60 | * items added to the mcast_list otherwise. |
61 | */ | |
62 | static int batadv_mcast_mla_softif_get(struct net_device *dev, | |
63 | struct hlist_head *mcast_list) | |
64 | { | |
65 | struct netdev_hw_addr *mc_list_entry; | |
66 | struct batadv_hw_addr *new; | |
67 | int ret = 0; | |
68 | ||
69 | netif_addr_lock_bh(dev); | |
70 | netdev_for_each_mc_addr(mc_list_entry, dev) { | |
71 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
72 | if (!new) { | |
73 | ret = -ENOMEM; | |
74 | break; | |
75 | } | |
76 | ||
77 | ether_addr_copy(new->addr, mc_list_entry->addr); | |
78 | hlist_add_head(&new->list, mcast_list); | |
79 | ret++; | |
80 | } | |
81 | netif_addr_unlock_bh(dev); | |
82 | ||
83 | return ret; | |
84 | } | |
85 | ||
86 | /** | |
87 | * batadv_mcast_mla_is_duplicate - check whether an address is in a list | |
88 | * @mcast_addr: the multicast address to check | |
89 | * @mcast_list: the list with multicast addresses to search in | |
90 | * | |
62fe710f | 91 | * Return: true if the given address is already in the given list. |
c5caf4ef LL |
92 | * Otherwise returns false. |
93 | */ | |
6b5e971a | 94 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
c5caf4ef LL |
95 | struct hlist_head *mcast_list) |
96 | { | |
97 | struct batadv_hw_addr *mcast_entry; | |
98 | ||
99 | hlist_for_each_entry(mcast_entry, mcast_list, list) | |
100 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
101 | return true; | |
102 | ||
103 | return false; | |
104 | } | |
105 | ||
106 | /** | |
107 | * batadv_mcast_mla_list_free - free a list of multicast addresses | |
2c72d655 | 108 | * @bat_priv: the bat priv with all the soft interface information |
c5caf4ef LL |
109 | * @mcast_list: the list to free |
110 | * | |
111 | * Removes and frees all items in the given mcast_list. | |
112 | */ | |
2c72d655 SE |
113 | static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv, |
114 | struct hlist_head *mcast_list) | |
c5caf4ef LL |
115 | { |
116 | struct batadv_hw_addr *mcast_entry; | |
117 | struct hlist_node *tmp; | |
118 | ||
2c72d655 SE |
119 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
120 | ||
c5caf4ef LL |
121 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
122 | hlist_del(&mcast_entry->list); | |
123 | kfree(mcast_entry); | |
124 | } | |
125 | } | |
126 | ||
127 | /** | |
128 | * batadv_mcast_mla_tt_retract - clean up multicast listener announcements | |
129 | * @bat_priv: the bat priv with all the soft interface information | |
130 | * @mcast_list: a list of addresses which should _not_ be removed | |
131 | * | |
132 | * Retracts the announcement of any multicast listener from the | |
133 | * translation table except the ones listed in the given mcast_list. | |
134 | * | |
135 | * If mcast_list is NULL then all are retracted. | |
136 | */ | |
137 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
138 | struct hlist_head *mcast_list) | |
139 | { | |
140 | struct batadv_hw_addr *mcast_entry; | |
141 | struct hlist_node *tmp; | |
142 | ||
2c72d655 SE |
143 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
144 | ||
c5caf4ef LL |
145 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
146 | list) { | |
147 | if (mcast_list && | |
148 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
149 | mcast_list)) | |
150 | continue; | |
151 | ||
152 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
153 | BATADV_NO_FLAGS, | |
154 | "mcast TT outdated", false); | |
155 | ||
156 | hlist_del(&mcast_entry->list); | |
157 | kfree(mcast_entry); | |
158 | } | |
159 | } | |
160 | ||
161 | /** | |
162 | * batadv_mcast_mla_tt_add - add multicast listener announcements | |
163 | * @bat_priv: the bat priv with all the soft interface information | |
164 | * @mcast_list: a list of addresses which are going to get added | |
165 | * | |
166 | * Adds multicast listener announcements from the given mcast_list to the | |
167 | * translation table if they have not been added yet. | |
168 | */ | |
169 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
170 | struct hlist_head *mcast_list) | |
171 | { | |
172 | struct batadv_hw_addr *mcast_entry; | |
173 | struct hlist_node *tmp; | |
174 | ||
2c72d655 SE |
175 | lockdep_assert_held(&bat_priv->tt.commit_lock); |
176 | ||
c5caf4ef LL |
177 | if (!mcast_list) |
178 | return; | |
179 | ||
180 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
181 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
182 | &bat_priv->mcast.mla_list)) | |
183 | continue; | |
184 | ||
185 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
186 | mcast_entry->addr, BATADV_NO_FLAGS, | |
187 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
188 | continue; | |
189 | ||
190 | hlist_del(&mcast_entry->list); | |
191 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
192 | } | |
193 | } | |
194 | ||
195 | /** | |
196 | * batadv_mcast_has_bridge - check whether the soft-iface is bridged | |
197 | * @bat_priv: the bat priv with all the soft interface information | |
198 | * | |
62fe710f SE |
199 | * Checks whether there is a bridge on top of our soft interface. |
200 | * | |
201 | * Return: true if there is a bridge, false otherwise. | |
c5caf4ef LL |
202 | */ |
203 | static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) | |
204 | { | |
205 | struct net_device *upper = bat_priv->soft_iface; | |
206 | ||
207 | rcu_read_lock(); | |
208 | do { | |
209 | upper = netdev_master_upper_dev_get_rcu(upper); | |
210 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
211 | rcu_read_unlock(); | |
212 | ||
213 | return upper; | |
214 | } | |
215 | ||
60432d75 LL |
216 | /** |
217 | * batadv_mcast_mla_tvlv_update - update multicast tvlv | |
218 | * @bat_priv: the bat priv with all the soft interface information | |
219 | * | |
220 | * Updates the own multicast tvlv with our current multicast related settings, | |
221 | * capabilities and inabilities. | |
222 | * | |
62fe710f | 223 | * Return: true if the tvlv container is registered afterwards. Otherwise |
60432d75 LL |
224 | * returns false. |
225 | */ | |
226 | static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) | |
227 | { | |
228 | struct batadv_tvlv_mcast_data mcast_data; | |
229 | ||
230 | mcast_data.flags = BATADV_NO_FLAGS; | |
231 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
232 | ||
233 | /* Avoid attaching MLAs, if there is a bridge on top of our soft | |
234 | * interface, we don't support that yet (TODO) | |
235 | */ | |
236 | if (batadv_mcast_has_bridge(bat_priv)) { | |
237 | if (bat_priv->mcast.enabled) { | |
238 | batadv_tvlv_container_unregister(bat_priv, | |
239 | BATADV_TVLV_MCAST, 1); | |
240 | bat_priv->mcast.enabled = false; | |
241 | } | |
242 | ||
243 | return false; | |
244 | } | |
245 | ||
246 | if (!bat_priv->mcast.enabled || | |
247 | mcast_data.flags != bat_priv->mcast.flags) { | |
248 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, | |
249 | &mcast_data, sizeof(mcast_data)); | |
250 | bat_priv->mcast.flags = mcast_data.flags; | |
251 | bat_priv->mcast.enabled = true; | |
252 | } | |
253 | ||
254 | return true; | |
255 | } | |
256 | ||
c5caf4ef LL |
257 | /** |
258 | * batadv_mcast_mla_update - update the own MLAs | |
259 | * @bat_priv: the bat priv with all the soft interface information | |
260 | * | |
60432d75 LL |
261 | * Updates the own multicast listener announcements in the translation |
262 | * table as well as the own, announced multicast tvlv container. | |
c5caf4ef LL |
263 | */ |
264 | void batadv_mcast_mla_update(struct batadv_priv *bat_priv) | |
265 | { | |
266 | struct net_device *soft_iface = bat_priv->soft_iface; | |
267 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
268 | int ret; | |
269 | ||
60432d75 | 270 | if (!batadv_mcast_mla_tvlv_update(bat_priv)) |
c5caf4ef LL |
271 | goto update; |
272 | ||
273 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); | |
274 | if (ret < 0) | |
275 | goto out; | |
276 | ||
277 | update: | |
278 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); | |
279 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
280 | ||
281 | out: | |
2c72d655 | 282 | batadv_mcast_mla_list_free(bat_priv, &mcast_list); |
c5caf4ef LL |
283 | } |
284 | ||
ab49886e LL |
285 | /** |
286 | * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential | |
287 | * @bat_priv: the bat priv with all the soft interface information | |
288 | * @skb: the IPv4 packet to check | |
289 | * @is_unsnoopable: stores whether the destination is snoopable | |
290 | * | |
291 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
292 | * mode more optimal than classic flooding. | |
293 | * | |
62fe710f SE |
294 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
295 | * allocation failure. | |
ab49886e LL |
296 | */ |
297 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
298 | struct sk_buff *skb, | |
299 | bool *is_unsnoopable) | |
300 | { | |
301 | struct iphdr *iphdr; | |
302 | ||
303 | /* We might fail due to out-of-memory -> drop it */ | |
304 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
305 | return -ENOMEM; | |
306 | ||
307 | iphdr = ip_hdr(skb); | |
308 | ||
309 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
310 | * then allow scope > link local, too | |
311 | */ | |
312 | if (!ipv4_is_local_multicast(iphdr->daddr)) | |
313 | return -EINVAL; | |
314 | ||
315 | /* link-local multicast listeners behind a bridge are | |
316 | * not snoopable (see RFC4541, section 2.1.2.2) | |
317 | */ | |
318 | *is_unsnoopable = true; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
1d8ab8d3 LL |
323 | /** |
324 | * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential | |
325 | * @bat_priv: the bat priv with all the soft interface information | |
326 | * @skb: the IPv6 packet to check | |
ab49886e | 327 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
328 | * |
329 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
330 | * mode more optimal than classic flooding. | |
331 | * | |
62fe710f | 332 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
333 | */ |
334 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e LL |
335 | struct sk_buff *skb, |
336 | bool *is_unsnoopable) | |
1d8ab8d3 LL |
337 | { |
338 | struct ipv6hdr *ip6hdr; | |
339 | ||
340 | /* We might fail due to out-of-memory -> drop it */ | |
341 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
342 | return -ENOMEM; | |
343 | ||
344 | ip6hdr = ipv6_hdr(skb); | |
345 | ||
346 | /* TODO: Implement Multicast Router Discovery (RFC4286), | |
347 | * then allow scope > link local, too | |
348 | */ | |
349 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL) | |
350 | return -EINVAL; | |
351 | ||
352 | /* link-local-all-nodes multicast listeners behind a bridge are | |
353 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
354 | */ | |
355 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 356 | *is_unsnoopable = true; |
1d8ab8d3 LL |
357 | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /** | |
362 | * batadv_mcast_forw_mode_check - check for optimized forwarding potential | |
363 | * @bat_priv: the bat priv with all the soft interface information | |
364 | * @skb: the multicast frame to check | |
ab49886e | 365 | * @is_unsnoopable: stores whether the destination is snoopable |
1d8ab8d3 LL |
366 | * |
367 | * Checks whether the given multicast ethernet frame has the potential to be | |
368 | * forwarded with a mode more optimal than classic flooding. | |
369 | * | |
62fe710f | 370 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
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 | 396 | /** |
6d030de8 AQ |
397 | * batadv_mcast_forw_want_all_ip_count - count nodes with unspecific mcast |
398 | * interest | |
4c8755d6 LL |
399 | * @bat_priv: the bat priv with all the soft interface information |
400 | * @ethhdr: ethernet header of a packet | |
401 | * | |
62fe710f | 402 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
403 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
404 | * IPv6 traffic if it matches an IPv6 packet. | |
405 | */ | |
406 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
407 | struct ethhdr *ethhdr) | |
408 | { | |
409 | switch (ntohs(ethhdr->h_proto)) { | |
410 | case ETH_P_IP: | |
411 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
412 | case ETH_P_IPV6: | |
413 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
414 | default: | |
415 | /* we shouldn't be here... */ | |
416 | return 0; | |
417 | } | |
418 | } | |
419 | ||
1d8ab8d3 LL |
420 | /** |
421 | * batadv_mcast_forw_tt_node_get - get a multicast tt node | |
422 | * @bat_priv: the bat priv with all the soft interface information | |
423 | * @ethhdr: the ether header containing the multicast destination | |
424 | * | |
62fe710f | 425 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
426 | * via a translation table lookup. This increases the returned nodes refcount. |
427 | */ | |
428 | static struct batadv_orig_node * | |
429 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
430 | struct ethhdr *ethhdr) | |
431 | { | |
432 | return batadv_transtable_search(bat_priv, ethhdr->h_source, | |
433 | ethhdr->h_dest, BATADV_NO_FLAGS); | |
434 | } | |
435 | ||
4c8755d6 | 436 | /** |
6d030de8 | 437 | * batadv_mcast_forw_ipv4_node_get - get a node with an ipv4 flag |
4c8755d6 LL |
438 | * @bat_priv: the bat priv with all the soft interface information |
439 | * | |
62fe710f | 440 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
441 | * increases its refcount. |
442 | */ | |
443 | static struct batadv_orig_node * | |
444 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
445 | { | |
446 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
447 | ||
448 | rcu_read_lock(); | |
449 | hlist_for_each_entry_rcu(tmp_orig_node, | |
450 | &bat_priv->mcast.want_all_ipv4_list, | |
451 | mcast_want_all_ipv4_node) { | |
7c124391 | 452 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
453 | continue; |
454 | ||
455 | orig_node = tmp_orig_node; | |
456 | break; | |
457 | } | |
458 | rcu_read_unlock(); | |
459 | ||
460 | return orig_node; | |
461 | } | |
462 | ||
463 | /** | |
6d030de8 | 464 | * batadv_mcast_forw_ipv6_node_get - get a node with an ipv6 flag |
4c8755d6 LL |
465 | * @bat_priv: the bat priv with all the soft interface information |
466 | * | |
62fe710f | 467 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
468 | * and increases its refcount. |
469 | */ | |
470 | static struct batadv_orig_node * | |
471 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
472 | { | |
473 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
474 | ||
475 | rcu_read_lock(); | |
476 | hlist_for_each_entry_rcu(tmp_orig_node, | |
477 | &bat_priv->mcast.want_all_ipv6_list, | |
478 | mcast_want_all_ipv6_node) { | |
7c124391 | 479 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
480 | continue; |
481 | ||
482 | orig_node = tmp_orig_node; | |
483 | break; | |
484 | } | |
485 | rcu_read_unlock(); | |
486 | ||
487 | return orig_node; | |
488 | } | |
489 | ||
490 | /** | |
6d030de8 | 491 | * batadv_mcast_forw_ip_node_get - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
492 | * @bat_priv: the bat priv with all the soft interface information |
493 | * @ethhdr: an ethernet header to determine the protocol family from | |
494 | * | |
62fe710f | 495 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
496 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
497 | * increases its refcount. | |
498 | */ | |
499 | static struct batadv_orig_node * | |
500 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
501 | struct ethhdr *ethhdr) | |
502 | { | |
503 | switch (ntohs(ethhdr->h_proto)) { | |
504 | case ETH_P_IP: | |
505 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
506 | case ETH_P_IPV6: | |
507 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
508 | default: | |
509 | /* we shouldn't be here... */ | |
510 | return NULL; | |
511 | } | |
512 | } | |
513 | ||
ab49886e | 514 | /** |
6d030de8 | 515 | * batadv_mcast_forw_unsnoop_node_get - get a node with an unsnoopable flag |
ab49886e LL |
516 | * @bat_priv: the bat priv with all the soft interface information |
517 | * | |
62fe710f | 518 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
519 | * set and increases its refcount. |
520 | */ | |
521 | static struct batadv_orig_node * | |
522 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
523 | { | |
524 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
525 | ||
526 | rcu_read_lock(); | |
527 | hlist_for_each_entry_rcu(tmp_orig_node, | |
528 | &bat_priv->mcast.want_all_unsnoopables_list, | |
529 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 530 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
531 | continue; |
532 | ||
533 | orig_node = tmp_orig_node; | |
534 | break; | |
535 | } | |
536 | rcu_read_unlock(); | |
537 | ||
538 | return orig_node; | |
539 | } | |
540 | ||
1d8ab8d3 LL |
541 | /** |
542 | * batadv_mcast_forw_mode - check on how to forward a multicast packet | |
543 | * @bat_priv: the bat priv with all the soft interface information | |
544 | * @skb: The multicast packet to check | |
545 | * @orig: an originator to be set to forward the skb to | |
546 | * | |
62fe710f | 547 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
548 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
549 | * should be forwarded to. | |
550 | */ | |
551 | enum batadv_forw_mode | |
552 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
553 | struct batadv_orig_node **orig) | |
554 | { | |
4c8755d6 | 555 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 556 | bool is_unsnoopable = false; |
1d8ab8d3 | 557 | struct ethhdr *ethhdr; |
1d8ab8d3 | 558 | |
ab49886e | 559 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable); |
1d8ab8d3 LL |
560 | if (ret == -ENOMEM) |
561 | return BATADV_FORW_NONE; | |
562 | else if (ret < 0) | |
563 | return BATADV_FORW_ALL; | |
564 | ||
565 | ethhdr = eth_hdr(skb); | |
566 | ||
567 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
568 | BATADV_NO_FLAGS); | |
4c8755d6 | 569 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
570 | unsnoop_count = !is_unsnoopable ? 0 : |
571 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
572 | ||
4c8755d6 | 573 | total_count = tt_count + ip_count + unsnoop_count; |
1d8ab8d3 | 574 | |
ab49886e | 575 | switch (total_count) { |
1d8ab8d3 | 576 | case 1: |
ab49886e LL |
577 | if (tt_count) |
578 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
579 | else if (ip_count) |
580 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
581 | else if (unsnoop_count) |
582 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
583 | ||
1d8ab8d3 LL |
584 | if (*orig) |
585 | return BATADV_FORW_SINGLE; | |
586 | ||
587 | /* fall through */ | |
588 | case 0: | |
589 | return BATADV_FORW_NONE; | |
590 | default: | |
591 | return BATADV_FORW_ALL; | |
592 | } | |
593 | } | |
594 | ||
ab49886e LL |
595 | /** |
596 | * batadv_mcast_want_unsnoop_update - update unsnoop counter and list | |
597 | * @bat_priv: the bat priv with all the soft interface information | |
598 | * @orig: the orig_node which multicast state might have changed of | |
599 | * @mcast_flags: flags indicating the new multicast state | |
600 | * | |
601 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
602 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
603 | * |
604 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
605 | */ |
606 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
607 | struct batadv_orig_node *orig, | |
6b5e971a | 608 | u8 mcast_flags) |
ab49886e | 609 | { |
8a4023c5 LL |
610 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
611 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
612 | ||
5274cd68 SE |
613 | lockdep_assert_held(&orig->mcast_handler_lock); |
614 | ||
ab49886e LL |
615 | /* switched from flag unset to set */ |
616 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
617 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
618 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
619 | ||
620 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
621 | /* flag checks above + mcast_handler_lock prevents this */ |
622 | WARN_ON(!hlist_unhashed(node)); | |
623 | ||
624 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
625 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
626 | /* switched from flag set to unset */ | |
627 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
628 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
629 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
630 | ||
631 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
632 | /* flag checks above + mcast_handler_lock prevents this */ |
633 | WARN_ON(hlist_unhashed(node)); | |
634 | ||
635 | hlist_del_init_rcu(node); | |
ab49886e LL |
636 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
637 | } | |
638 | } | |
639 | ||
4c8755d6 LL |
640 | /** |
641 | * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list | |
642 | * @bat_priv: the bat priv with all the soft interface information | |
643 | * @orig: the orig_node which multicast state might have changed of | |
644 | * @mcast_flags: flags indicating the new multicast state | |
645 | * | |
646 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
647 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
648 | * |
649 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
650 | */ |
651 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
652 | struct batadv_orig_node *orig, | |
6b5e971a | 653 | u8 mcast_flags) |
4c8755d6 | 654 | { |
8a4023c5 LL |
655 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
656 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
657 | ||
5274cd68 SE |
658 | lockdep_assert_held(&orig->mcast_handler_lock); |
659 | ||
4c8755d6 LL |
660 | /* switched from flag unset to set */ |
661 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
662 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
663 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
664 | ||
665 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
666 | /* flag checks above + mcast_handler_lock prevents this */ |
667 | WARN_ON(!hlist_unhashed(node)); | |
668 | ||
669 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
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_IPV4) && | |
673 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
674 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
675 | ||
676 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
677 | /* flag checks above + mcast_handler_lock prevents this */ |
678 | WARN_ON(hlist_unhashed(node)); | |
679 | ||
680 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
681 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
682 | } | |
683 | } | |
684 | ||
685 | /** | |
686 | * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list | |
687 | * @bat_priv: the bat priv with all the soft interface information | |
688 | * @orig: the orig_node which multicast state might have changed of | |
689 | * @mcast_flags: flags indicating the new multicast state | |
690 | * | |
691 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
692 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
693 | * |
694 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
695 | */ |
696 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
697 | struct batadv_orig_node *orig, | |
6b5e971a | 698 | u8 mcast_flags) |
4c8755d6 | 699 | { |
8a4023c5 LL |
700 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
701 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
702 | ||
5274cd68 SE |
703 | lockdep_assert_held(&orig->mcast_handler_lock); |
704 | ||
4c8755d6 LL |
705 | /* switched from flag unset to set */ |
706 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
707 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
708 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
709 | ||
710 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
711 | /* flag checks above + mcast_handler_lock prevents this */ |
712 | WARN_ON(!hlist_unhashed(node)); | |
713 | ||
714 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
715 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
716 | /* switched from flag set to unset */ | |
717 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
718 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
719 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
720 | ||
721 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
722 | /* flag checks above + mcast_handler_lock prevents this */ |
723 | WARN_ON(hlist_unhashed(node)); | |
724 | ||
725 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
726 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
727 | } | |
728 | } | |
729 | ||
60432d75 LL |
730 | /** |
731 | * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container | |
732 | * @bat_priv: the bat priv with all the soft interface information | |
733 | * @orig: the orig_node of the ogm | |
734 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
735 | * @tvlv_value: tvlv buffer containing the multicast data | |
736 | * @tvlv_value_len: tvlv buffer length | |
737 | */ | |
738 | static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
739 | struct batadv_orig_node *orig, | |
6b5e971a | 740 | u8 flags, |
60432d75 | 741 | void *tvlv_value, |
6b5e971a | 742 | u16 tvlv_value_len) |
60432d75 LL |
743 | { |
744 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
6b5e971a | 745 | u8 mcast_flags = BATADV_NO_FLAGS; |
60432d75 LL |
746 | bool orig_initialized; |
747 | ||
8a4023c5 LL |
748 | if (orig_mcast_enabled && tvlv_value && |
749 | (tvlv_value_len >= sizeof(mcast_flags))) | |
6b5e971a | 750 | mcast_flags = *(u8 *)tvlv_value; |
8a4023c5 LL |
751 | |
752 | spin_lock_bh(&orig->mcast_handler_lock); | |
9c936e3f LL |
753 | orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
754 | &orig->capa_initialized); | |
60432d75 LL |
755 | |
756 | /* If mcast support is turned on decrease the disabled mcast node | |
757 | * counter only if we had increased it for this node before. If this | |
758 | * is a completely new orig_node no need to decrease the counter. | |
759 | */ | |
760 | if (orig_mcast_enabled && | |
9c936e3f | 761 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
60432d75 LL |
762 | if (orig_initialized) |
763 | atomic_dec(&bat_priv->mcast.num_disabled); | |
9c936e3f | 764 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
e8829f00 LL |
765 | /* If mcast support is being switched off or if this is an initial |
766 | * OGM without mcast support then increase the disabled mcast | |
767 | * node counter. | |
60432d75 LL |
768 | */ |
769 | } else if (!orig_mcast_enabled && | |
9c936e3f | 770 | (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) || |
e8829f00 | 771 | !orig_initialized)) { |
60432d75 | 772 | atomic_inc(&bat_priv->mcast.num_disabled); |
9c936e3f | 773 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
774 | } |
775 | ||
9c936e3f | 776 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 777 | |
ab49886e | 778 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
779 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
780 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 781 | |
60432d75 | 782 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 783 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
784 | } |
785 | ||
786 | /** | |
787 | * batadv_mcast_init - initialize the multicast optimizations structures | |
788 | * @bat_priv: the bat priv with all the soft interface information | |
789 | */ | |
790 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
791 | { | |
792 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, | |
793 | NULL, BATADV_TVLV_MCAST, 1, | |
794 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
795 | } | |
796 | ||
c5caf4ef LL |
797 | /** |
798 | * batadv_mcast_free - free the multicast optimizations structures | |
799 | * @bat_priv: the bat priv with all the soft interface information | |
800 | */ | |
801 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
802 | { | |
60432d75 LL |
803 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); |
804 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); | |
805 | ||
af63cf51 | 806 | spin_lock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 807 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
af63cf51 | 808 | spin_unlock_bh(&bat_priv->tt.commit_lock); |
c5caf4ef | 809 | } |
60432d75 LL |
810 | |
811 | /** | |
812 | * batadv_mcast_purge_orig - reset originator global mcast state modifications | |
813 | * @orig: the originator which is going to get purged | |
814 | */ | |
815 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
816 | { | |
817 | struct batadv_priv *bat_priv = orig->bat_priv; | |
818 | ||
8a4023c5 LL |
819 | spin_lock_bh(&orig->mcast_handler_lock); |
820 | ||
9c936e3f LL |
821 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) && |
822 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized)) | |
60432d75 | 823 | atomic_dec(&bat_priv->mcast.num_disabled); |
ab49886e LL |
824 | |
825 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); | |
4c8755d6 LL |
826 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
827 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
828 | |
829 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 830 | } |