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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7a79d717 | 2 | /* Copyright (C) 2014-2019 B.A.T.M.A.N. contributors: |
c5caf4ef LL |
3 | * |
4 | * Linus Lüssing | |
c5caf4ef LL |
5 | */ |
6 | ||
c5caf4ef | 7 | #include "multicast.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
10 | #include <linux/atomic.h> | |
9c936e3f | 11 | #include <linux/bitops.h> |
8a4023c5 | 12 | #include <linux/bug.h> |
1e2c2a4f SE |
13 | #include <linux/byteorder/generic.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/etherdevice.h> | |
b92b94ac | 16 | #include <linux/gfp.h> |
bd2a979e | 17 | #include <linux/icmpv6.h> |
687937ab | 18 | #include <linux/if_bridge.h> |
1e2c2a4f | 19 | #include <linux/if_ether.h> |
bd2a979e | 20 | #include <linux/igmp.h> |
1e2c2a4f | 21 | #include <linux/in.h> |
bd2a979e | 22 | #include <linux/in6.h> |
5c506802 | 23 | #include <linux/inetdevice.h> |
1e2c2a4f SE |
24 | #include <linux/ip.h> |
25 | #include <linux/ipv6.h> | |
cbebd363 | 26 | #include <linux/jiffies.h> |
72f7b2de | 27 | #include <linux/kernel.h> |
7c124391 | 28 | #include <linux/kref.h> |
1e2c2a4f | 29 | #include <linux/list.h> |
2c72d655 | 30 | #include <linux/lockdep.h> |
1e2c2a4f | 31 | #include <linux/netdevice.h> |
53dd9a68 | 32 | #include <linux/netlink.h> |
687937ab | 33 | #include <linux/printk.h> |
1e2c2a4f SE |
34 | #include <linux/rculist.h> |
35 | #include <linux/rcupdate.h> | |
4e3e823b | 36 | #include <linux/seq_file.h> |
1e2c2a4f SE |
37 | #include <linux/skbuff.h> |
38 | #include <linux/slab.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/stddef.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/types.h> | |
cbebd363 | 43 | #include <linux/workqueue.h> |
1e2c2a4f | 44 | #include <net/addrconf.h> |
53dd9a68 | 45 | #include <net/genetlink.h> |
687937ab LL |
46 | #include <net/if_inet6.h> |
47 | #include <net/ip.h> | |
1e2c2a4f | 48 | #include <net/ipv6.h> |
53dd9a68 LL |
49 | #include <net/netlink.h> |
50 | #include <net/sock.h> | |
fec149f5 | 51 | #include <uapi/linux/batadv_packet.h> |
53dd9a68 | 52 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f | 53 | |
4e3e823b LL |
54 | #include "hard-interface.h" |
55 | #include "hash.h" | |
ba412080 | 56 | #include "log.h" |
53dd9a68 | 57 | #include "netlink.h" |
32e72744 | 58 | #include "send.h" |
53dd9a68 | 59 | #include "soft-interface.h" |
c5caf4ef | 60 | #include "translation-table.h" |
1f8dce49 | 61 | #include "tvlv.h" |
c5caf4ef | 62 | |
cbebd363 LL |
63 | static void batadv_mcast_mla_update(struct work_struct *work); |
64 | ||
65 | /** | |
7e9a8c2c | 66 | * batadv_mcast_start_timer() - schedule the multicast periodic worker |
cbebd363 LL |
67 | * @bat_priv: the bat priv with all the soft interface information |
68 | */ | |
69 | static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) | |
70 | { | |
71 | queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, | |
72 | msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); | |
73 | } | |
74 | ||
6bc45440 | 75 | /** |
61caf3d1 LL |
76 | * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists |
77 | * @soft_iface: netdev struct of the mesh interface | |
6bc45440 | 78 | * |
61caf3d1 LL |
79 | * If the given soft interface has a bridge on top then the refcount |
80 | * of the according net device is increased. | |
6bc45440 | 81 | * |
61caf3d1 LL |
82 | * Return: NULL if no such bridge exists. Otherwise the net device of the |
83 | * bridge. | |
6bc45440 | 84 | */ |
61caf3d1 | 85 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) |
6bc45440 | 86 | { |
61caf3d1 | 87 | struct net_device *upper = soft_iface; |
6bc45440 LL |
88 | |
89 | rcu_read_lock(); | |
90 | do { | |
91 | upper = netdev_master_upper_dev_get_rcu(upper); | |
92 | } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); | |
61caf3d1 LL |
93 | |
94 | if (upper) | |
95 | dev_hold(upper); | |
6bc45440 LL |
96 | rcu_read_unlock(); |
97 | ||
98 | return upper; | |
99 | } | |
100 | ||
61caf3d1 LL |
101 | /** |
102 | * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from | |
103 | * node for IPv4 | |
104 | * @dev: the interface to check | |
105 | * | |
106 | * Checks the presence of an IPv4 multicast router on this node. | |
107 | * | |
108 | * Caller needs to hold rcu read lock. | |
109 | * | |
110 | * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise. | |
111 | */ | |
112 | static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev) | |
113 | { | |
114 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
115 | ||
116 | if (in_dev && IN_DEV_MFORWARD(in_dev)) | |
117 | return BATADV_NO_FLAGS; | |
118 | else | |
119 | return BATADV_MCAST_WANT_NO_RTR4; | |
120 | } | |
121 | ||
122 | /** | |
123 | * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from | |
124 | * node for IPv6 | |
125 | * @dev: the interface to check | |
126 | * | |
127 | * Checks the presence of an IPv6 multicast router on this node. | |
128 | * | |
129 | * Caller needs to hold rcu read lock. | |
130 | * | |
131 | * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise. | |
132 | */ | |
133 | #if IS_ENABLED(CONFIG_IPV6_MROUTE) | |
134 | static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) | |
135 | { | |
136 | struct inet6_dev *in6_dev = __in6_dev_get(dev); | |
137 | ||
138 | if (in6_dev && in6_dev->cnf.mc_forwarding) | |
139 | return BATADV_NO_FLAGS; | |
140 | else | |
141 | return BATADV_MCAST_WANT_NO_RTR6; | |
142 | } | |
143 | #else | |
144 | static inline u8 | |
145 | batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) | |
146 | { | |
147 | return BATADV_MCAST_WANT_NO_RTR6; | |
148 | } | |
149 | #endif | |
150 | ||
151 | /** | |
152 | * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node | |
153 | * @bat_priv: the bat priv with all the soft interface information | |
154 | * @bridge: bridge interface on top of the soft_iface if present, | |
155 | * otherwise pass NULL | |
156 | * | |
157 | * Checks the presence of IPv4 and IPv6 multicast routers on this | |
158 | * node. | |
159 | * | |
160 | * Return: | |
161 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present | |
162 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present | |
163 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present | |
164 | * The former two OR'd: no multicast router is present | |
165 | */ | |
166 | static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv, | |
167 | struct net_device *bridge) | |
168 | { | |
169 | struct net_device *dev = bridge ? bridge : bat_priv->soft_iface; | |
170 | u8 flags = BATADV_NO_FLAGS; | |
171 | ||
172 | rcu_read_lock(); | |
173 | ||
174 | flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev); | |
175 | flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev); | |
176 | ||
177 | rcu_read_unlock(); | |
178 | ||
179 | return flags; | |
180 | } | |
181 | ||
182 | /** | |
183 | * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge | |
184 | * @bat_priv: the bat priv with all the soft interface information | |
185 | * @bridge: bridge interface on top of the soft_iface if present, | |
186 | * otherwise pass NULL | |
187 | * | |
188 | * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge. | |
189 | * | |
190 | * Return: | |
191 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present | |
192 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present | |
193 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present | |
194 | * The former two OR'd: no multicast router is present | |
195 | */ | |
196 | #if IS_ENABLED(CONFIG_IPV6) | |
197 | static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, | |
198 | struct net_device *bridge) | |
199 | { | |
200 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
201 | struct net_device *dev = bat_priv->soft_iface; | |
202 | struct br_ip_list *br_ip_entry, *tmp; | |
203 | u8 flags = BATADV_MCAST_WANT_NO_RTR6; | |
204 | int ret; | |
205 | ||
206 | if (!bridge) | |
207 | return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; | |
208 | ||
209 | /* TODO: ask the bridge if a multicast router is present (the bridge | |
210 | * is capable of performing proper RFC4286 multicast multicast router | |
211 | * discovery) instead of searching for a ff02::2 listener here | |
212 | */ | |
213 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
214 | if (ret < 0) | |
215 | return BATADV_NO_FLAGS; | |
216 | ||
217 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
218 | /* the bridge snooping does not maintain IPv4 link-local | |
219 | * addresses - therefore we won't find any IPv4 multicast router | |
220 | * address here, only IPv6 ones | |
221 | */ | |
222 | if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) && | |
223 | ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.u.ip6)) | |
224 | flags &= ~BATADV_MCAST_WANT_NO_RTR6; | |
225 | ||
226 | list_del(&br_ip_entry->list); | |
227 | kfree(br_ip_entry); | |
228 | } | |
229 | ||
230 | return flags; | |
231 | } | |
232 | #else | |
233 | static inline u8 | |
234 | batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, | |
235 | struct net_device *bridge) | |
236 | { | |
237 | if (bridge) | |
238 | return BATADV_NO_FLAGS; | |
239 | else | |
240 | return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; | |
241 | } | |
242 | #endif | |
243 | ||
244 | /** | |
245 | * batadv_mcast_mla_rtr_flags_get() - get multicast router flags | |
246 | * @bat_priv: the bat priv with all the soft interface information | |
247 | * @bridge: bridge interface on top of the soft_iface if present, | |
248 | * otherwise pass NULL | |
249 | * | |
250 | * Checks the presence of IPv4 and IPv6 multicast routers on this | |
251 | * node or behind its bridge. | |
252 | * | |
253 | * Return: | |
254 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present | |
255 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present | |
256 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present | |
257 | * The former two OR'd: no multicast router is present | |
258 | */ | |
259 | static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv, | |
260 | struct net_device *bridge) | |
261 | { | |
262 | u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; | |
263 | ||
264 | flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge); | |
265 | flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge); | |
266 | ||
267 | return flags; | |
268 | } | |
269 | ||
6bc45440 LL |
270 | /** |
271 | * batadv_mcast_mla_flags_get() - get the new multicast flags | |
272 | * @bat_priv: the bat priv with all the soft interface information | |
273 | * | |
274 | * Return: A set of flags for the current/next TVLV, querier and | |
275 | * bridge state. | |
276 | */ | |
277 | static struct batadv_mcast_mla_flags | |
278 | batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv) | |
279 | { | |
280 | struct net_device *dev = bat_priv->soft_iface; | |
281 | struct batadv_mcast_querier_state *qr4, *qr6; | |
282 | struct batadv_mcast_mla_flags mla_flags; | |
61caf3d1 LL |
283 | struct net_device *bridge; |
284 | ||
285 | bridge = batadv_mcast_get_bridge(dev); | |
6bc45440 LL |
286 | |
287 | memset(&mla_flags, 0, sizeof(mla_flags)); | |
288 | mla_flags.enabled = 1; | |
61caf3d1 LL |
289 | mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv, |
290 | bridge); | |
6bc45440 | 291 | |
61caf3d1 | 292 | if (!bridge) |
6bc45440 LL |
293 | return mla_flags; |
294 | ||
61caf3d1 LL |
295 | dev_put(bridge); |
296 | ||
6bc45440 LL |
297 | mla_flags.bridged = 1; |
298 | qr4 = &mla_flags.querier_ipv4; | |
299 | qr6 = &mla_flags.querier_ipv6; | |
300 | ||
301 | if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) | |
302 | pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); | |
303 | ||
304 | qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); | |
305 | qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); | |
306 | ||
307 | qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); | |
308 | qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); | |
309 | ||
310 | mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; | |
311 | ||
312 | /* 1) If no querier exists at all, then multicast listeners on | |
313 | * our local TT clients behind the bridge will keep silent. | |
314 | * 2) If the selected querier is on one of our local TT clients, | |
315 | * behind the bridge, then this querier might shadow multicast | |
316 | * listeners on our local TT clients, behind this bridge. | |
317 | * | |
318 | * In both cases, we will signalize other batman nodes that | |
319 | * we need all multicast traffic of the according protocol. | |
320 | */ | |
61caf3d1 | 321 | if (!qr4->exists || qr4->shadowing) { |
6bc45440 | 322 | mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4; |
61caf3d1 LL |
323 | mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4; |
324 | } | |
6bc45440 | 325 | |
61caf3d1 | 326 | if (!qr6->exists || qr6->shadowing) { |
6bc45440 | 327 | mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6; |
61caf3d1 LL |
328 | mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6; |
329 | } | |
6bc45440 LL |
330 | |
331 | return mla_flags; | |
332 | } | |
333 | ||
6b253603 | 334 | /** |
5c506802 LL |
335 | * batadv_mcast_mla_is_duplicate() - check whether an address is in a list |
336 | * @mcast_addr: the multicast address to check | |
337 | * @mcast_list: the list with multicast addresses to search in | |
6b253603 | 338 | * |
5c506802 LL |
339 | * Return: true if the given address is already in the given list. |
340 | * Otherwise returns false. | |
6b253603 | 341 | */ |
5c506802 LL |
342 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
343 | struct hlist_head *mcast_list) | |
6b253603 | 344 | { |
5c506802 | 345 | struct batadv_hw_addr *mcast_entry; |
6b253603 | 346 | |
5c506802 LL |
347 | hlist_for_each_entry(mcast_entry, mcast_list, list) |
348 | if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) | |
349 | return true; | |
350 | ||
351 | return false; | |
6b253603 LL |
352 | } |
353 | ||
354 | /** | |
5c506802 LL |
355 | * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners |
356 | * @dev: the device to collect multicast addresses from | |
357 | * @mcast_list: a list to put found addresses into | |
358 | * @flags: flags indicating the new multicast state | |
6b253603 | 359 | * |
5c506802 LL |
360 | * Collects multicast addresses of IPv4 multicast listeners residing |
361 | * on this kernel on the given soft interface, dev, in | |
362 | * the given mcast_list. In general, multicast listeners provided by | |
363 | * your multicast receiving applications run directly on this node. | |
364 | * | |
365 | * Return: -ENOMEM on memory allocation error or the number of | |
366 | * items added to the mcast_list otherwise. | |
6b253603 | 367 | */ |
5c506802 LL |
368 | static int |
369 | batadv_mcast_mla_softif_get_ipv4(struct net_device *dev, | |
370 | struct hlist_head *mcast_list, | |
371 | struct batadv_mcast_mla_flags *flags) | |
6b253603 | 372 | { |
5c506802 LL |
373 | struct batadv_hw_addr *new; |
374 | struct in_device *in_dev; | |
375 | u8 mcast_addr[ETH_ALEN]; | |
376 | struct ip_mc_list *pmc; | |
377 | int ret = 0; | |
378 | ||
379 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) | |
380 | return 0; | |
381 | ||
382 | rcu_read_lock(); | |
6b253603 | 383 | |
5c506802 LL |
384 | in_dev = __in_dev_get_rcu(dev); |
385 | if (!in_dev) { | |
386 | rcu_read_unlock(); | |
387 | return 0; | |
388 | } | |
389 | ||
390 | for (pmc = rcu_dereference(in_dev->mc_list); pmc; | |
391 | pmc = rcu_dereference(pmc->next_rcu)) { | |
390dcd48 LL |
392 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
393 | ipv4_is_local_multicast(pmc->multiaddr)) | |
394 | continue; | |
395 | ||
61caf3d1 LL |
396 | if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && |
397 | !ipv4_is_local_multicast(pmc->multiaddr)) | |
398 | continue; | |
399 | ||
5c506802 LL |
400 | ip_eth_mc_map(pmc->multiaddr, mcast_addr); |
401 | ||
402 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
403 | continue; | |
404 | ||
405 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
406 | if (!new) { | |
407 | ret = -ENOMEM; | |
408 | break; | |
409 | } | |
410 | ||
411 | ether_addr_copy(new->addr, mcast_addr); | |
412 | hlist_add_head(&new->list, mcast_list); | |
413 | ret++; | |
414 | } | |
415 | rcu_read_unlock(); | |
416 | ||
417 | return ret; | |
6b253603 LL |
418 | } |
419 | ||
c5caf4ef | 420 | /** |
5c506802 | 421 | * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners |
c5caf4ef LL |
422 | * @dev: the device to collect multicast addresses from |
423 | * @mcast_list: a list to put found addresses into | |
6bc45440 | 424 | * @flags: flags indicating the new multicast state |
c5caf4ef | 425 | * |
5c506802 | 426 | * Collects multicast addresses of IPv6 multicast listeners residing |
687937ab LL |
427 | * on this kernel on the given soft interface, dev, in |
428 | * the given mcast_list. In general, multicast listeners provided by | |
429 | * your multicast receiving applications run directly on this node. | |
430 | * | |
62fe710f | 431 | * Return: -ENOMEM on memory allocation error or the number of |
c5caf4ef LL |
432 | * items added to the mcast_list otherwise. |
433 | */ | |
5c506802 | 434 | #if IS_ENABLED(CONFIG_IPV6) |
6bc45440 | 435 | static int |
5c506802 LL |
436 | batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, |
437 | struct hlist_head *mcast_list, | |
438 | struct batadv_mcast_mla_flags *flags) | |
c5caf4ef | 439 | { |
c5caf4ef | 440 | struct batadv_hw_addr *new; |
5c506802 LL |
441 | struct inet6_dev *in6_dev; |
442 | u8 mcast_addr[ETH_ALEN]; | |
443 | struct ifmcaddr6 *pmc6; | |
c5caf4ef LL |
444 | int ret = 0; |
445 | ||
5c506802 LL |
446 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) |
447 | return 0; | |
448 | ||
449 | rcu_read_lock(); | |
450 | ||
451 | in6_dev = __in6_dev_get(dev); | |
452 | if (!in6_dev) { | |
453 | rcu_read_unlock(); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | read_lock_bh(&in6_dev->lock); | |
458 | for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) { | |
459 | if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) < | |
460 | IPV6_ADDR_SCOPE_LINKLOCAL) | |
6b253603 LL |
461 | continue; |
462 | ||
390dcd48 LL |
463 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
464 | ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr)) | |
465 | continue; | |
466 | ||
61caf3d1 LL |
467 | if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && |
468 | IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) > | |
469 | IPV6_ADDR_SCOPE_LINKLOCAL) | |
470 | continue; | |
471 | ||
5c506802 LL |
472 | ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr); |
473 | ||
474 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
6b253603 LL |
475 | continue; |
476 | ||
c5caf4ef LL |
477 | new = kmalloc(sizeof(*new), GFP_ATOMIC); |
478 | if (!new) { | |
479 | ret = -ENOMEM; | |
480 | break; | |
481 | } | |
482 | ||
5c506802 | 483 | ether_addr_copy(new->addr, mcast_addr); |
c5caf4ef LL |
484 | hlist_add_head(&new->list, mcast_list); |
485 | ret++; | |
486 | } | |
5c506802 LL |
487 | read_unlock_bh(&in6_dev->lock); |
488 | rcu_read_unlock(); | |
c5caf4ef LL |
489 | |
490 | return ret; | |
491 | } | |
5c506802 LL |
492 | #else |
493 | static inline int | |
494 | batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, | |
495 | struct hlist_head *mcast_list, | |
496 | struct batadv_mcast_mla_flags *flags) | |
497 | { | |
498 | return 0; | |
499 | } | |
500 | #endif | |
c5caf4ef LL |
501 | |
502 | /** | |
5c506802 LL |
503 | * batadv_mcast_mla_softif_get() - get softif multicast listeners |
504 | * @dev: the device to collect multicast addresses from | |
505 | * @mcast_list: a list to put found addresses into | |
506 | * @flags: flags indicating the new multicast state | |
c5caf4ef | 507 | * |
5c506802 LL |
508 | * Collects multicast addresses of multicast listeners residing |
509 | * on this kernel on the given soft interface, dev, in | |
510 | * the given mcast_list. In general, multicast listeners provided by | |
511 | * your multicast receiving applications run directly on this node. | |
512 | * | |
513 | * If there is a bridge interface on top of dev, collects from that one | |
514 | * instead. Just like with IP addresses and routes, multicast listeners | |
515 | * will(/should) register to the bridge interface instead of an | |
516 | * enslaved bat0. | |
517 | * | |
518 | * Return: -ENOMEM on memory allocation error or the number of | |
519 | * items added to the mcast_list otherwise. | |
c5caf4ef | 520 | */ |
5c506802 LL |
521 | static int |
522 | batadv_mcast_mla_softif_get(struct net_device *dev, | |
523 | struct hlist_head *mcast_list, | |
524 | struct batadv_mcast_mla_flags *flags) | |
c5caf4ef | 525 | { |
5c506802 LL |
526 | struct net_device *bridge = batadv_mcast_get_bridge(dev); |
527 | int ret4, ret6 = 0; | |
c5caf4ef | 528 | |
5c506802 LL |
529 | if (bridge) |
530 | dev = bridge; | |
c5caf4ef | 531 | |
5c506802 LL |
532 | ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags); |
533 | if (ret4 < 0) | |
534 | goto out; | |
535 | ||
536 | ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags); | |
537 | if (ret6 < 0) { | |
538 | ret4 = 0; | |
539 | goto out; | |
540 | } | |
541 | ||
542 | out: | |
543 | if (bridge) | |
544 | dev_put(bridge); | |
545 | ||
546 | return ret4 + ret6; | |
c5caf4ef LL |
547 | } |
548 | ||
687937ab | 549 | /** |
7e9a8c2c | 550 | * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address |
687937ab LL |
551 | * @dst: destination to write to - a multicast MAC address |
552 | * @src: source to read from - a multicast IP address | |
553 | * | |
554 | * Converts a given multicast IPv4/IPv6 address from a bridge | |
555 | * to its matching multicast MAC address and copies it into the given | |
556 | * destination buffer. | |
557 | * | |
558 | * Caller needs to make sure the destination buffer can hold | |
559 | * at least ETH_ALEN bytes. | |
560 | */ | |
561 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) | |
562 | { | |
563 | if (src->proto == htons(ETH_P_IP)) | |
564 | ip_eth_mc_map(src->u.ip4, dst); | |
565 | #if IS_ENABLED(CONFIG_IPV6) | |
566 | else if (src->proto == htons(ETH_P_IPV6)) | |
567 | ipv6_eth_mc_map(&src->u.ip6, dst); | |
568 | #endif | |
569 | else | |
570 | eth_zero_addr(dst); | |
571 | } | |
572 | ||
573 | /** | |
7e9a8c2c | 574 | * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners |
687937ab LL |
575 | * @dev: a bridge slave whose bridge to collect multicast addresses from |
576 | * @mcast_list: a list to put found addresses into | |
6bc45440 | 577 | * @flags: flags indicating the new multicast state |
687937ab LL |
578 | * |
579 | * Collects multicast addresses of multicast listeners residing | |
580 | * on foreign, non-mesh devices which we gave access to our mesh via | |
581 | * a bridge on top of the given soft interface, dev, in the given | |
582 | * mcast_list. | |
583 | * | |
584 | * Return: -ENOMEM on memory allocation error or the number of | |
585 | * items added to the mcast_list otherwise. | |
586 | */ | |
6bc45440 LL |
587 | static int batadv_mcast_mla_bridge_get(struct net_device *dev, |
588 | struct hlist_head *mcast_list, | |
589 | struct batadv_mcast_mla_flags *flags) | |
687937ab LL |
590 | { |
591 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); | |
592 | struct br_ip_list *br_ip_entry, *tmp; | |
390dcd48 | 593 | u8 tvlv_flags = flags->tvlv_flags; |
687937ab LL |
594 | struct batadv_hw_addr *new; |
595 | u8 mcast_addr[ETH_ALEN]; | |
596 | int ret; | |
597 | ||
598 | /* we don't need to detect these devices/listeners, the IGMP/MLD | |
599 | * snooping code of the Linux bridge already does that for us | |
600 | */ | |
601 | ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); | |
602 | if (ret < 0) | |
603 | goto out; | |
604 | ||
605 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { | |
390dcd48 LL |
606 | if (br_ip_entry->addr.proto == htons(ETH_P_IP)) { |
607 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) | |
608 | continue; | |
6b253603 | 609 | |
390dcd48 LL |
610 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
611 | ipv4_is_local_multicast(br_ip_entry->addr.u.ip4)) | |
612 | continue; | |
61caf3d1 LL |
613 | |
614 | if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && | |
615 | !ipv4_is_local_multicast(br_ip_entry->addr.u.ip4)) | |
616 | continue; | |
390dcd48 LL |
617 | } |
618 | ||
619 | #if IS_ENABLED(CONFIG_IPV6) | |
620 | if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) { | |
621 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) | |
622 | continue; | |
623 | ||
624 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
625 | ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.u.ip6)) | |
626 | continue; | |
61caf3d1 LL |
627 | |
628 | if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && | |
629 | IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.u.ip6) > | |
630 | IPV6_ADDR_SCOPE_LINKLOCAL) | |
631 | continue; | |
390dcd48 LL |
632 | } |
633 | #endif | |
6b253603 | 634 | |
687937ab LL |
635 | batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); |
636 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) | |
637 | continue; | |
638 | ||
639 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
640 | if (!new) { | |
641 | ret = -ENOMEM; | |
642 | break; | |
643 | } | |
644 | ||
645 | ether_addr_copy(new->addr, mcast_addr); | |
646 | hlist_add_head(&new->list, mcast_list); | |
647 | } | |
648 | ||
649 | out: | |
650 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { | |
651 | list_del(&br_ip_entry->list); | |
652 | kfree(br_ip_entry); | |
653 | } | |
654 | ||
655 | return ret; | |
656 | } | |
657 | ||
c5caf4ef | 658 | /** |
7e9a8c2c | 659 | * batadv_mcast_mla_list_free() - free a list of multicast addresses |
c5caf4ef LL |
660 | * @mcast_list: the list to free |
661 | * | |
662 | * Removes and frees all items in the given mcast_list. | |
663 | */ | |
b7769763 | 664 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) |
c5caf4ef LL |
665 | { |
666 | struct batadv_hw_addr *mcast_entry; | |
667 | struct hlist_node *tmp; | |
668 | ||
669 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
670 | hlist_del(&mcast_entry->list); | |
671 | kfree(mcast_entry); | |
672 | } | |
673 | } | |
674 | ||
675 | /** | |
7e9a8c2c | 676 | * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements |
c5caf4ef LL |
677 | * @bat_priv: the bat priv with all the soft interface information |
678 | * @mcast_list: a list of addresses which should _not_ be removed | |
679 | * | |
680 | * Retracts the announcement of any multicast listener from the | |
681 | * translation table except the ones listed in the given mcast_list. | |
682 | * | |
683 | * If mcast_list is NULL then all are retracted. | |
684 | */ | |
685 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, | |
686 | struct hlist_head *mcast_list) | |
687 | { | |
688 | struct batadv_hw_addr *mcast_entry; | |
689 | struct hlist_node *tmp; | |
690 | ||
691 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, | |
692 | list) { | |
693 | if (mcast_list && | |
694 | batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
695 | mcast_list)) | |
696 | continue; | |
697 | ||
698 | batadv_tt_local_remove(bat_priv, mcast_entry->addr, | |
699 | BATADV_NO_FLAGS, | |
700 | "mcast TT outdated", false); | |
701 | ||
702 | hlist_del(&mcast_entry->list); | |
703 | kfree(mcast_entry); | |
704 | } | |
705 | } | |
706 | ||
707 | /** | |
7e9a8c2c | 708 | * batadv_mcast_mla_tt_add() - add multicast listener announcements |
c5caf4ef LL |
709 | * @bat_priv: the bat priv with all the soft interface information |
710 | * @mcast_list: a list of addresses which are going to get added | |
711 | * | |
712 | * Adds multicast listener announcements from the given mcast_list to the | |
713 | * translation table if they have not been added yet. | |
714 | */ | |
715 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, | |
716 | struct hlist_head *mcast_list) | |
717 | { | |
718 | struct batadv_hw_addr *mcast_entry; | |
719 | struct hlist_node *tmp; | |
720 | ||
721 | if (!mcast_list) | |
722 | return; | |
723 | ||
724 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { | |
725 | if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, | |
726 | &bat_priv->mcast.mla_list)) | |
727 | continue; | |
728 | ||
729 | if (!batadv_tt_local_add(bat_priv->soft_iface, | |
730 | mcast_entry->addr, BATADV_NO_FLAGS, | |
731 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) | |
732 | continue; | |
733 | ||
734 | hlist_del(&mcast_entry->list); | |
735 | hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); | |
736 | } | |
737 | } | |
738 | ||
72f7b2de | 739 | /** |
7e9a8c2c SE |
740 | * batadv_mcast_querier_log() - debug output regarding the querier status on |
741 | * link | |
72f7b2de LL |
742 | * @bat_priv: the bat priv with all the soft interface information |
743 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") | |
744 | * @old_state: the previous querier state on our link | |
745 | * @new_state: the new querier state on our link | |
746 | * | |
747 | * Outputs debug messages to the logging facility with log level 'mcast' | |
748 | * regarding changes to the querier status on the link which are relevant | |
749 | * to our multicast optimizations. | |
750 | * | |
751 | * Usually this is about whether a querier appeared or vanished in | |
752 | * our mesh or whether the querier is in the suboptimal position of being | |
753 | * behind our local bridge segment: Snooping switches will directly | |
754 | * forward listener reports to the querier, therefore batman-adv and | |
755 | * the bridge will potentially not see these listeners - the querier is | |
756 | * potentially shadowing listeners from us then. | |
757 | * | |
758 | * This is only interesting for nodes with a bridge on top of their | |
759 | * soft interface. | |
760 | */ | |
761 | static void | |
762 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, | |
763 | struct batadv_mcast_querier_state *old_state, | |
764 | struct batadv_mcast_querier_state *new_state) | |
765 | { | |
766 | if (!old_state->exists && new_state->exists) | |
767 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", | |
768 | str_proto); | |
769 | else if (old_state->exists && !new_state->exists) | |
770 | batadv_info(bat_priv->soft_iface, | |
771 | "%s Querier disappeared - multicast optimizations disabled\n", | |
772 | str_proto); | |
6bc45440 | 773 | else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists) |
72f7b2de LL |
774 | batadv_info(bat_priv->soft_iface, |
775 | "No %s Querier present - multicast optimizations disabled\n", | |
776 | str_proto); | |
777 | ||
778 | if (new_state->exists) { | |
779 | if ((!old_state->shadowing && new_state->shadowing) || | |
780 | (!old_state->exists && new_state->shadowing)) | |
781 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
782 | "%s Querier is behind our bridged segment: Might shadow listeners\n", | |
783 | str_proto); | |
784 | else if (old_state->shadowing && !new_state->shadowing) | |
785 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
786 | "%s Querier is not behind our bridged segment\n", | |
787 | str_proto); | |
788 | } | |
789 | } | |
790 | ||
791 | /** | |
7e9a8c2c SE |
792 | * batadv_mcast_bridge_log() - debug output for topology changes in bridged |
793 | * setups | |
72f7b2de | 794 | * @bat_priv: the bat priv with all the soft interface information |
6bc45440 | 795 | * @new_flags: flags indicating the new multicast state |
72f7b2de LL |
796 | * |
797 | * If no bridges are ever used on this node, then this function does nothing. | |
798 | * | |
799 | * Otherwise this function outputs debug information to the 'mcast' log level | |
800 | * which might be relevant to our multicast optimizations. | |
801 | * | |
802 | * More precisely, it outputs information when a bridge interface is added or | |
803 | * removed from a soft interface. And when a bridge is present, it further | |
804 | * outputs information about the querier state which is relevant for the | |
805 | * multicast flags this node is going to set. | |
806 | */ | |
807 | static void | |
6bc45440 LL |
808 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, |
809 | struct batadv_mcast_mla_flags *new_flags) | |
72f7b2de | 810 | { |
6bc45440 LL |
811 | struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags; |
812 | ||
813 | if (!old_flags->bridged && new_flags->bridged) | |
72f7b2de LL |
814 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
815 | "Bridge added: Setting Unsnoopables(U)-flag\n"); | |
6bc45440 | 816 | else if (old_flags->bridged && !new_flags->bridged) |
72f7b2de LL |
817 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
818 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); | |
819 | ||
6bc45440 | 820 | if (new_flags->bridged) { |
72f7b2de | 821 | batadv_mcast_querier_log(bat_priv, "IGMP", |
6bc45440 LL |
822 | &old_flags->querier_ipv4, |
823 | &new_flags->querier_ipv4); | |
72f7b2de | 824 | batadv_mcast_querier_log(bat_priv, "MLD", |
6bc45440 LL |
825 | &old_flags->querier_ipv6, |
826 | &new_flags->querier_ipv6); | |
72f7b2de LL |
827 | } |
828 | } | |
829 | ||
830 | /** | |
7e9a8c2c | 831 | * batadv_mcast_flags_logs() - output debug information about mcast flag changes |
72f7b2de | 832 | * @bat_priv: the bat priv with all the soft interface information |
6bc45440 | 833 | * @flags: TVLV flags indicating the new multicast state |
72f7b2de | 834 | * |
6bc45440 LL |
835 | * Whenever the multicast TVLV flags this nodes announces change this notifies |
836 | * userspace via the 'mcast' log level. | |
72f7b2de LL |
837 | */ |
838 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) | |
839 | { | |
6bc45440 LL |
840 | bool old_enabled = bat_priv->mcast.mla_flags.enabled; |
841 | u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags; | |
61caf3d1 | 842 | char str_old_flags[] = "[.... . ]"; |
72f7b2de | 843 | |
61caf3d1 | 844 | sprintf(str_old_flags, "[%c%c%c%s%s]", |
72f7b2de LL |
845 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', |
846 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
61caf3d1 LL |
847 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', |
848 | !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", | |
849 | !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); | |
72f7b2de LL |
850 | |
851 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, | |
61caf3d1 | 852 | "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n", |
6bc45440 | 853 | old_enabled ? str_old_flags : "<undefined>", |
72f7b2de LL |
854 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', |
855 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
61caf3d1 LL |
856 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', |
857 | !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", | |
858 | !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); | |
72f7b2de LL |
859 | } |
860 | ||
60432d75 | 861 | /** |
6bc45440 | 862 | * batadv_mcast_mla_flags_update() - update multicast flags |
60432d75 | 863 | * @bat_priv: the bat priv with all the soft interface information |
6bc45440 | 864 | * @flags: flags indicating the new multicast state |
60432d75 LL |
865 | * |
866 | * Updates the own multicast tvlv with our current multicast related settings, | |
867 | * capabilities and inabilities. | |
60432d75 | 868 | */ |
6bc45440 LL |
869 | static void |
870 | batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv, | |
871 | struct batadv_mcast_mla_flags *flags) | |
60432d75 LL |
872 | { |
873 | struct batadv_tvlv_mcast_data mcast_data; | |
60432d75 | 874 | |
6bc45440 LL |
875 | if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags))) |
876 | return; | |
72f7b2de | 877 | |
6bc45440 LL |
878 | batadv_mcast_bridge_log(bat_priv, flags); |
879 | batadv_mcast_flags_log(bat_priv, flags->tvlv_flags); | |
72f7b2de | 880 | |
6bc45440 LL |
881 | mcast_data.flags = flags->tvlv_flags; |
882 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); | |
72f7b2de | 883 | |
6bc45440 LL |
884 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, |
885 | &mcast_data, sizeof(mcast_data)); | |
60432d75 | 886 | |
6bc45440 | 887 | bat_priv->mcast.mla_flags = *flags; |
60432d75 LL |
888 | } |
889 | ||
c5caf4ef | 890 | /** |
7e9a8c2c | 891 | * __batadv_mcast_mla_update() - update the own MLAs |
c5caf4ef LL |
892 | * @bat_priv: the bat priv with all the soft interface information |
893 | * | |
60432d75 LL |
894 | * Updates the own multicast listener announcements in the translation |
895 | * table as well as the own, announced multicast tvlv container. | |
cbebd363 LL |
896 | * |
897 | * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list | |
898 | * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are | |
899 | * ensured by the non-parallel execution of the worker this function | |
900 | * belongs to. | |
c5caf4ef | 901 | */ |
cbebd363 | 902 | static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) |
c5caf4ef LL |
903 | { |
904 | struct net_device *soft_iface = bat_priv->soft_iface; | |
905 | struct hlist_head mcast_list = HLIST_HEAD_INIT; | |
6bc45440 | 906 | struct batadv_mcast_mla_flags flags; |
c5caf4ef LL |
907 | int ret; |
908 | ||
6bc45440 | 909 | flags = batadv_mcast_mla_flags_get(bat_priv); |
c5caf4ef | 910 | |
6bc45440 | 911 | ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags); |
c5caf4ef LL |
912 | if (ret < 0) |
913 | goto out; | |
914 | ||
6bc45440 | 915 | ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags); |
687937ab LL |
916 | if (ret < 0) |
917 | goto out; | |
918 | ||
6bc45440 | 919 | spin_lock(&bat_priv->mcast.mla_lock); |
c5caf4ef LL |
920 | batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); |
921 | batadv_mcast_mla_tt_add(bat_priv, &mcast_list); | |
6bc45440 LL |
922 | batadv_mcast_mla_flags_update(bat_priv, &flags); |
923 | spin_unlock(&bat_priv->mcast.mla_lock); | |
c5caf4ef LL |
924 | |
925 | out: | |
b7769763 | 926 | batadv_mcast_mla_list_free(&mcast_list); |
c5caf4ef LL |
927 | } |
928 | ||
cbebd363 | 929 | /** |
7e9a8c2c | 930 | * batadv_mcast_mla_update() - update the own MLAs |
cbebd363 LL |
931 | * @work: kernel work struct |
932 | * | |
933 | * Updates the own multicast listener announcements in the translation | |
934 | * table as well as the own, announced multicast tvlv container. | |
935 | * | |
936 | * In the end, reschedules the work timer. | |
937 | */ | |
938 | static void batadv_mcast_mla_update(struct work_struct *work) | |
939 | { | |
940 | struct delayed_work *delayed_work; | |
941 | struct batadv_priv_mcast *priv_mcast; | |
942 | struct batadv_priv *bat_priv; | |
943 | ||
944 | delayed_work = to_delayed_work(work); | |
945 | priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); | |
946 | bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); | |
947 | ||
948 | __batadv_mcast_mla_update(bat_priv); | |
949 | batadv_mcast_start_timer(bat_priv); | |
950 | } | |
951 | ||
bd2a979e | 952 | /** |
7e9a8c2c | 953 | * batadv_mcast_is_report_ipv4() - check for IGMP reports |
bd2a979e LL |
954 | * @skb: the ethernet frame destined for the mesh |
955 | * | |
956 | * This call might reallocate skb data. | |
957 | * | |
958 | * Checks whether the given frame is a valid IGMP report. | |
959 | * | |
960 | * Return: If so then true, otherwise false. | |
961 | */ | |
962 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) | |
963 | { | |
ba5ea614 | 964 | if (ip_mc_check_igmp(skb) < 0) |
bd2a979e LL |
965 | return false; |
966 | ||
967 | switch (igmp_hdr(skb)->type) { | |
968 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
969 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
970 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
971 | return true; | |
972 | } | |
973 | ||
974 | return false; | |
975 | } | |
976 | ||
ab49886e | 977 | /** |
7e9a8c2c SE |
978 | * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding |
979 | * potential | |
ab49886e LL |
980 | * @bat_priv: the bat priv with all the soft interface information |
981 | * @skb: the IPv4 packet to check | |
982 | * @is_unsnoopable: stores whether the destination is snoopable | |
11d458c1 | 983 | * @is_routable: stores whether the destination is routable |
ab49886e LL |
984 | * |
985 | * Checks whether the given IPv4 packet has the potential to be forwarded with a | |
986 | * mode more optimal than classic flooding. | |
987 | * | |
62fe710f SE |
988 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
989 | * allocation failure. | |
ab49886e LL |
990 | */ |
991 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, | |
992 | struct sk_buff *skb, | |
11d458c1 LL |
993 | bool *is_unsnoopable, |
994 | int *is_routable) | |
ab49886e LL |
995 | { |
996 | struct iphdr *iphdr; | |
997 | ||
998 | /* We might fail due to out-of-memory -> drop it */ | |
999 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) | |
1000 | return -ENOMEM; | |
1001 | ||
bd2a979e LL |
1002 | if (batadv_mcast_is_report_ipv4(skb)) |
1003 | return -EINVAL; | |
1004 | ||
ab49886e LL |
1005 | iphdr = ip_hdr(skb); |
1006 | ||
ab49886e LL |
1007 | /* link-local multicast listeners behind a bridge are |
1008 | * not snoopable (see RFC4541, section 2.1.2.2) | |
1009 | */ | |
11d458c1 LL |
1010 | if (ipv4_is_local_multicast(iphdr->daddr)) |
1011 | *is_unsnoopable = true; | |
1012 | else | |
1013 | *is_routable = ETH_P_IP; | |
ab49886e LL |
1014 | |
1015 | return 0; | |
1016 | } | |
1017 | ||
bd2a979e | 1018 | /** |
7e9a8c2c | 1019 | * batadv_mcast_is_report_ipv6() - check for MLD reports |
bd2a979e LL |
1020 | * @skb: the ethernet frame destined for the mesh |
1021 | * | |
1022 | * This call might reallocate skb data. | |
1023 | * | |
1024 | * Checks whether the given frame is a valid MLD report. | |
1025 | * | |
1026 | * Return: If so then true, otherwise false. | |
1027 | */ | |
1028 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) | |
1029 | { | |
ba5ea614 | 1030 | if (ipv6_mc_check_mld(skb) < 0) |
bd2a979e LL |
1031 | return false; |
1032 | ||
1033 | switch (icmp6_hdr(skb)->icmp6_type) { | |
1034 | case ICMPV6_MGM_REPORT: | |
1035 | case ICMPV6_MLD2_REPORT: | |
1036 | return true; | |
1037 | } | |
1038 | ||
1039 | return false; | |
1040 | } | |
1041 | ||
1d8ab8d3 | 1042 | /** |
7e9a8c2c SE |
1043 | * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding |
1044 | * potential | |
1d8ab8d3 LL |
1045 | * @bat_priv: the bat priv with all the soft interface information |
1046 | * @skb: the IPv6 packet to check | |
ab49886e | 1047 | * @is_unsnoopable: stores whether the destination is snoopable |
11d458c1 | 1048 | * @is_routable: stores whether the destination is routable |
1d8ab8d3 LL |
1049 | * |
1050 | * Checks whether the given IPv6 packet has the potential to be forwarded with a | |
1051 | * mode more optimal than classic flooding. | |
1052 | * | |
62fe710f | 1053 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
1054 | */ |
1055 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, | |
ab49886e | 1056 | struct sk_buff *skb, |
11d458c1 LL |
1057 | bool *is_unsnoopable, |
1058 | int *is_routable) | |
1d8ab8d3 LL |
1059 | { |
1060 | struct ipv6hdr *ip6hdr; | |
1061 | ||
1062 | /* We might fail due to out-of-memory -> drop it */ | |
1063 | if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) | |
1064 | return -ENOMEM; | |
1065 | ||
bd2a979e LL |
1066 | if (batadv_mcast_is_report_ipv6(skb)) |
1067 | return -EINVAL; | |
1068 | ||
1d8ab8d3 LL |
1069 | ip6hdr = ipv6_hdr(skb); |
1070 | ||
11d458c1 | 1071 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
1d8ab8d3 LL |
1072 | return -EINVAL; |
1073 | ||
1074 | /* link-local-all-nodes multicast listeners behind a bridge are | |
1075 | * not snoopable (see RFC4541, section 3, paragraph 3) | |
1076 | */ | |
1077 | if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) | |
ab49886e | 1078 | *is_unsnoopable = true; |
11d458c1 LL |
1079 | else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL) |
1080 | *is_routable = ETH_P_IPV6; | |
1d8ab8d3 LL |
1081 | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | /** | |
7e9a8c2c | 1086 | * batadv_mcast_forw_mode_check() - check for optimized forwarding potential |
1d8ab8d3 LL |
1087 | * @bat_priv: the bat priv with all the soft interface information |
1088 | * @skb: the multicast frame to check | |
ab49886e | 1089 | * @is_unsnoopable: stores whether the destination is snoopable |
11d458c1 | 1090 | * @is_routable: stores whether the destination is routable |
1d8ab8d3 LL |
1091 | * |
1092 | * Checks whether the given multicast ethernet frame has the potential to be | |
1093 | * forwarded with a mode more optimal than classic flooding. | |
1094 | * | |
62fe710f | 1095 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1d8ab8d3 LL |
1096 | */ |
1097 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, | |
ab49886e | 1098 | struct sk_buff *skb, |
11d458c1 LL |
1099 | bool *is_unsnoopable, |
1100 | int *is_routable) | |
1d8ab8d3 LL |
1101 | { |
1102 | struct ethhdr *ethhdr = eth_hdr(skb); | |
1103 | ||
1104 | if (!atomic_read(&bat_priv->multicast_mode)) | |
1105 | return -EINVAL; | |
1106 | ||
1d8ab8d3 | 1107 | switch (ntohs(ethhdr->h_proto)) { |
ab49886e LL |
1108 | case ETH_P_IP: |
1109 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, | |
11d458c1 LL |
1110 | is_unsnoopable, |
1111 | is_routable); | |
1d8ab8d3 | 1112 | case ETH_P_IPV6: |
c1bacea0 SE |
1113 | if (!IS_ENABLED(CONFIG_IPV6)) |
1114 | return -EINVAL; | |
1115 | ||
ab49886e | 1116 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
11d458c1 LL |
1117 | is_unsnoopable, |
1118 | is_routable); | |
1d8ab8d3 LL |
1119 | default: |
1120 | return -EINVAL; | |
1121 | } | |
1122 | } | |
1123 | ||
4c8755d6 | 1124 | /** |
7e9a8c2c | 1125 | * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast |
6d030de8 | 1126 | * interest |
4c8755d6 LL |
1127 | * @bat_priv: the bat priv with all the soft interface information |
1128 | * @ethhdr: ethernet header of a packet | |
1129 | * | |
62fe710f | 1130 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
4c8755d6 LL |
1131 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
1132 | * IPv6 traffic if it matches an IPv6 packet. | |
1133 | */ | |
1134 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, | |
1135 | struct ethhdr *ethhdr) | |
1136 | { | |
1137 | switch (ntohs(ethhdr->h_proto)) { | |
1138 | case ETH_P_IP: | |
1139 | return atomic_read(&bat_priv->mcast.num_want_all_ipv4); | |
1140 | case ETH_P_IPV6: | |
1141 | return atomic_read(&bat_priv->mcast.num_want_all_ipv6); | |
1142 | default: | |
1143 | /* we shouldn't be here... */ | |
1144 | return 0; | |
1145 | } | |
1146 | } | |
1147 | ||
11d458c1 LL |
1148 | /** |
1149 | * batadv_mcast_forw_rtr_count() - count nodes with a multicast router | |
1150 | * @bat_priv: the bat priv with all the soft interface information | |
1151 | * @protocol: the ethernet protocol type to count multicast routers for | |
1152 | * | |
1153 | * Return: the number of nodes which want all routable IPv4 multicast traffic | |
1154 | * if the protocol is ETH_P_IP or the number of nodes which want all routable | |
1155 | * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0. | |
1156 | */ | |
1157 | ||
1158 | static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv, | |
1159 | int protocol) | |
1160 | { | |
1161 | switch (protocol) { | |
1162 | case ETH_P_IP: | |
1163 | return atomic_read(&bat_priv->mcast.num_want_all_rtr4); | |
1164 | case ETH_P_IPV6: | |
1165 | return atomic_read(&bat_priv->mcast.num_want_all_rtr6); | |
1166 | default: | |
1167 | return 0; | |
1168 | } | |
1169 | } | |
1170 | ||
1d8ab8d3 | 1171 | /** |
7e9a8c2c | 1172 | * batadv_mcast_forw_tt_node_get() - get a multicast tt node |
1d8ab8d3 LL |
1173 | * @bat_priv: the bat priv with all the soft interface information |
1174 | * @ethhdr: the ether header containing the multicast destination | |
1175 | * | |
62fe710f | 1176 | * Return: an orig_node matching the multicast address provided by ethhdr |
1d8ab8d3 LL |
1177 | * via a translation table lookup. This increases the returned nodes refcount. |
1178 | */ | |
1179 | static struct batadv_orig_node * | |
1180 | batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, | |
1181 | struct ethhdr *ethhdr) | |
1182 | { | |
f8fb3419 LL |
1183 | return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest, |
1184 | BATADV_NO_FLAGS); | |
1d8ab8d3 LL |
1185 | } |
1186 | ||
4c8755d6 | 1187 | /** |
7e9a8c2c | 1188 | * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag |
4c8755d6 LL |
1189 | * @bat_priv: the bat priv with all the soft interface information |
1190 | * | |
62fe710f | 1191 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and |
4c8755d6 LL |
1192 | * increases its refcount. |
1193 | */ | |
1194 | static struct batadv_orig_node * | |
1195 | batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) | |
1196 | { | |
1197 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
1198 | ||
1199 | rcu_read_lock(); | |
1200 | hlist_for_each_entry_rcu(tmp_orig_node, | |
1201 | &bat_priv->mcast.want_all_ipv4_list, | |
1202 | mcast_want_all_ipv4_node) { | |
7c124391 | 1203 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
1204 | continue; |
1205 | ||
1206 | orig_node = tmp_orig_node; | |
1207 | break; | |
1208 | } | |
1209 | rcu_read_unlock(); | |
1210 | ||
1211 | return orig_node; | |
1212 | } | |
1213 | ||
1214 | /** | |
7e9a8c2c | 1215 | * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag |
4c8755d6 LL |
1216 | * @bat_priv: the bat priv with all the soft interface information |
1217 | * | |
62fe710f | 1218 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set |
4c8755d6 LL |
1219 | * and increases its refcount. |
1220 | */ | |
1221 | static struct batadv_orig_node * | |
1222 | batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) | |
1223 | { | |
1224 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
1225 | ||
1226 | rcu_read_lock(); | |
1227 | hlist_for_each_entry_rcu(tmp_orig_node, | |
1228 | &bat_priv->mcast.want_all_ipv6_list, | |
1229 | mcast_want_all_ipv6_node) { | |
7c124391 | 1230 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
4c8755d6 LL |
1231 | continue; |
1232 | ||
1233 | orig_node = tmp_orig_node; | |
1234 | break; | |
1235 | } | |
1236 | rcu_read_unlock(); | |
1237 | ||
1238 | return orig_node; | |
1239 | } | |
1240 | ||
1241 | /** | |
7e9a8c2c | 1242 | * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag |
4c8755d6 LL |
1243 | * @bat_priv: the bat priv with all the soft interface information |
1244 | * @ethhdr: an ethernet header to determine the protocol family from | |
1245 | * | |
62fe710f | 1246 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or |
4c8755d6 LL |
1247 | * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and |
1248 | * increases its refcount. | |
1249 | */ | |
1250 | static struct batadv_orig_node * | |
1251 | batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, | |
1252 | struct ethhdr *ethhdr) | |
1253 | { | |
1254 | switch (ntohs(ethhdr->h_proto)) { | |
1255 | case ETH_P_IP: | |
1256 | return batadv_mcast_forw_ipv4_node_get(bat_priv); | |
1257 | case ETH_P_IPV6: | |
1258 | return batadv_mcast_forw_ipv6_node_get(bat_priv); | |
1259 | default: | |
1260 | /* we shouldn't be here... */ | |
1261 | return NULL; | |
1262 | } | |
1263 | } | |
1264 | ||
ab49886e | 1265 | /** |
7e9a8c2c | 1266 | * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag |
ab49886e LL |
1267 | * @bat_priv: the bat priv with all the soft interface information |
1268 | * | |
62fe710f | 1269 | * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag |
ab49886e LL |
1270 | * set and increases its refcount. |
1271 | */ | |
1272 | static struct batadv_orig_node * | |
1273 | batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) | |
1274 | { | |
1275 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
1276 | ||
1277 | rcu_read_lock(); | |
1278 | hlist_for_each_entry_rcu(tmp_orig_node, | |
1279 | &bat_priv->mcast.want_all_unsnoopables_list, | |
1280 | mcast_want_all_unsnoopables_node) { | |
7c124391 | 1281 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) |
ab49886e LL |
1282 | continue; |
1283 | ||
1284 | orig_node = tmp_orig_node; | |
1285 | break; | |
1286 | } | |
1287 | rcu_read_unlock(); | |
1288 | ||
1289 | return orig_node; | |
1290 | } | |
1291 | ||
11d458c1 LL |
1292 | /** |
1293 | * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag | |
1294 | * @bat_priv: the bat priv with all the soft interface information | |
1295 | * | |
1296 | * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and | |
1297 | * increases its refcount. | |
1298 | */ | |
1299 | static struct batadv_orig_node * | |
1300 | batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv) | |
1301 | { | |
1302 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
1303 | ||
1304 | rcu_read_lock(); | |
1305 | hlist_for_each_entry_rcu(tmp_orig_node, | |
1306 | &bat_priv->mcast.want_all_rtr4_list, | |
1307 | mcast_want_all_rtr4_node) { | |
1308 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) | |
1309 | continue; | |
1310 | ||
1311 | orig_node = tmp_orig_node; | |
1312 | break; | |
1313 | } | |
1314 | rcu_read_unlock(); | |
1315 | ||
1316 | return orig_node; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag | |
1321 | * @bat_priv: the bat priv with all the soft interface information | |
1322 | * | |
1323 | * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset | |
1324 | * and increases its refcount. | |
1325 | */ | |
1326 | static struct batadv_orig_node * | |
1327 | batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv) | |
1328 | { | |
1329 | struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; | |
1330 | ||
1331 | rcu_read_lock(); | |
1332 | hlist_for_each_entry_rcu(tmp_orig_node, | |
1333 | &bat_priv->mcast.want_all_rtr6_list, | |
1334 | mcast_want_all_rtr6_node) { | |
1335 | if (!kref_get_unless_zero(&tmp_orig_node->refcount)) | |
1336 | continue; | |
1337 | ||
1338 | orig_node = tmp_orig_node; | |
1339 | break; | |
1340 | } | |
1341 | rcu_read_unlock(); | |
1342 | ||
1343 | return orig_node; | |
1344 | } | |
1345 | ||
1346 | /** | |
1347 | * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag | |
1348 | * @bat_priv: the bat priv with all the soft interface information | |
1349 | * @ethhdr: an ethernet header to determine the protocol family from | |
1350 | * | |
1351 | * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or | |
1352 | * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and | |
1353 | * increases its refcount. | |
1354 | */ | |
1355 | static struct batadv_orig_node * | |
1356 | batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv, | |
1357 | struct ethhdr *ethhdr) | |
1358 | { | |
1359 | switch (ntohs(ethhdr->h_proto)) { | |
1360 | case ETH_P_IP: | |
1361 | return batadv_mcast_forw_rtr4_node_get(bat_priv); | |
1362 | case ETH_P_IPV6: | |
1363 | return batadv_mcast_forw_rtr6_node_get(bat_priv); | |
1364 | default: | |
1365 | /* we shouldn't be here... */ | |
1366 | return NULL; | |
1367 | } | |
1368 | } | |
1369 | ||
1d8ab8d3 | 1370 | /** |
7e9a8c2c | 1371 | * batadv_mcast_forw_mode() - check on how to forward a multicast packet |
1d8ab8d3 LL |
1372 | * @bat_priv: the bat priv with all the soft interface information |
1373 | * @skb: The multicast packet to check | |
1374 | * @orig: an originator to be set to forward the skb to | |
1375 | * | |
62fe710f | 1376 | * Return: the forwarding mode as enum batadv_forw_mode and in case of |
1d8ab8d3 LL |
1377 | * BATADV_FORW_SINGLE set the orig to the single originator the skb |
1378 | * should be forwarded to. | |
1379 | */ | |
1380 | enum batadv_forw_mode | |
1381 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1382 | struct batadv_orig_node **orig) | |
1383 | { | |
4c8755d6 | 1384 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
ab49886e | 1385 | bool is_unsnoopable = false; |
32e72744 | 1386 | unsigned int mcast_fanout; |
1d8ab8d3 | 1387 | struct ethhdr *ethhdr; |
11d458c1 LL |
1388 | int is_routable = 0; |
1389 | int rtr_count = 0; | |
1d8ab8d3 | 1390 | |
11d458c1 LL |
1391 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable, |
1392 | &is_routable); | |
1d8ab8d3 LL |
1393 | if (ret == -ENOMEM) |
1394 | return BATADV_FORW_NONE; | |
1395 | else if (ret < 0) | |
1396 | return BATADV_FORW_ALL; | |
1397 | ||
1398 | ethhdr = eth_hdr(skb); | |
1399 | ||
1400 | tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, | |
1401 | BATADV_NO_FLAGS); | |
4c8755d6 | 1402 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
ab49886e LL |
1403 | unsnoop_count = !is_unsnoopable ? 0 : |
1404 | atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); | |
11d458c1 | 1405 | rtr_count = batadv_mcast_forw_rtr_count(bat_priv, is_routable); |
ab49886e | 1406 | |
11d458c1 | 1407 | total_count = tt_count + ip_count + unsnoop_count + rtr_count; |
1d8ab8d3 | 1408 | |
ab49886e | 1409 | switch (total_count) { |
1d8ab8d3 | 1410 | case 1: |
ab49886e LL |
1411 | if (tt_count) |
1412 | *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); | |
4c8755d6 LL |
1413 | else if (ip_count) |
1414 | *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); | |
ab49886e LL |
1415 | else if (unsnoop_count) |
1416 | *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); | |
11d458c1 LL |
1417 | else if (rtr_count) |
1418 | *orig = batadv_mcast_forw_rtr_node_get(bat_priv, | |
1419 | ethhdr); | |
ab49886e | 1420 | |
1d8ab8d3 LL |
1421 | if (*orig) |
1422 | return BATADV_FORW_SINGLE; | |
1423 | ||
1424 | /* fall through */ | |
1425 | case 0: | |
1426 | return BATADV_FORW_NONE; | |
1427 | default: | |
32e72744 LL |
1428 | mcast_fanout = atomic_read(&bat_priv->multicast_fanout); |
1429 | ||
1430 | if (!unsnoop_count && total_count <= mcast_fanout) | |
1431 | return BATADV_FORW_SOME; | |
1432 | } | |
1433 | ||
1434 | return BATADV_FORW_ALL; | |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * batadv_mcast_forw_tt() - forwards a packet to multicast listeners | |
1439 | * @bat_priv: the bat priv with all the soft interface information | |
1440 | * @skb: the multicast packet to transmit | |
1441 | * @vid: the vlan identifier | |
1442 | * | |
1443 | * Sends copies of a frame with multicast destination to any multicast | |
1444 | * listener registered in the translation table. A transmission is performed | |
1445 | * via a batman-adv unicast packet for each such destination node. | |
1446 | * | |
1447 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS | |
1448 | * otherwise. | |
1449 | */ | |
1450 | static int | |
1451 | batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1452 | unsigned short vid) | |
1453 | { | |
1454 | int ret = NET_XMIT_SUCCESS; | |
1455 | struct sk_buff *newskb; | |
1456 | ||
1457 | struct batadv_tt_orig_list_entry *orig_entry; | |
1458 | ||
1459 | struct batadv_tt_global_entry *tt_global; | |
1460 | const u8 *addr = eth_hdr(skb)->h_dest; | |
1461 | ||
1462 | tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); | |
1463 | if (!tt_global) | |
1464 | goto out; | |
1465 | ||
1466 | rcu_read_lock(); | |
1467 | hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) { | |
1468 | newskb = skb_copy(skb, GFP_ATOMIC); | |
1469 | if (!newskb) { | |
1470 | ret = NET_XMIT_DROP; | |
1471 | break; | |
1472 | } | |
1473 | ||
1474 | batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0, | |
1475 | orig_entry->orig_node, vid); | |
1476 | } | |
1477 | rcu_read_unlock(); | |
1478 | ||
1479 | batadv_tt_global_entry_put(tt_global); | |
1480 | ||
1481 | out: | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1485 | /** | |
1486 | * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4 | |
1487 | * @bat_priv: the bat priv with all the soft interface information | |
1488 | * @skb: the multicast packet to transmit | |
1489 | * @vid: the vlan identifier | |
1490 | * | |
1491 | * Sends copies of a frame with multicast destination to any node with a | |
1492 | * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a | |
1493 | * batman-adv unicast packet for each such destination node. | |
1494 | * | |
1495 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS | |
1496 | * otherwise. | |
1497 | */ | |
1498 | static int | |
1499 | batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv, | |
1500 | struct sk_buff *skb, unsigned short vid) | |
1501 | { | |
1502 | struct batadv_orig_node *orig_node; | |
1503 | int ret = NET_XMIT_SUCCESS; | |
1504 | struct sk_buff *newskb; | |
1505 | ||
1506 | rcu_read_lock(); | |
1507 | hlist_for_each_entry_rcu(orig_node, | |
1508 | &bat_priv->mcast.want_all_ipv4_list, | |
1509 | mcast_want_all_ipv4_node) { | |
1510 | newskb = skb_copy(skb, GFP_ATOMIC); | |
1511 | if (!newskb) { | |
1512 | ret = NET_XMIT_DROP; | |
1513 | break; | |
1514 | } | |
1515 | ||
1516 | batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0, | |
1517 | orig_node, vid); | |
1518 | } | |
1519 | rcu_read_unlock(); | |
1520 | return ret; | |
1521 | } | |
1522 | ||
1523 | /** | |
1524 | * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6 | |
1525 | * @bat_priv: the bat priv with all the soft interface information | |
1526 | * @skb: The multicast packet to transmit | |
1527 | * @vid: the vlan identifier | |
1528 | * | |
1529 | * Sends copies of a frame with multicast destination to any node with a | |
1530 | * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a | |
1531 | * batman-adv unicast packet for each such destination node. | |
1532 | * | |
1533 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS | |
1534 | * otherwise. | |
1535 | */ | |
1536 | static int | |
1537 | batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv, | |
1538 | struct sk_buff *skb, unsigned short vid) | |
1539 | { | |
1540 | struct batadv_orig_node *orig_node; | |
1541 | int ret = NET_XMIT_SUCCESS; | |
1542 | struct sk_buff *newskb; | |
1543 | ||
1544 | rcu_read_lock(); | |
1545 | hlist_for_each_entry_rcu(orig_node, | |
1546 | &bat_priv->mcast.want_all_ipv6_list, | |
1547 | mcast_want_all_ipv6_node) { | |
1548 | newskb = skb_copy(skb, GFP_ATOMIC); | |
1549 | if (!newskb) { | |
1550 | ret = NET_XMIT_DROP; | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0, | |
1555 | orig_node, vid); | |
1d8ab8d3 | 1556 | } |
32e72744 LL |
1557 | rcu_read_unlock(); |
1558 | return ret; | |
1559 | } | |
1560 | ||
1561 | /** | |
1562 | * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list | |
1563 | * @bat_priv: the bat priv with all the soft interface information | |
1564 | * @skb: the multicast packet to transmit | |
1565 | * @vid: the vlan identifier | |
1566 | * | |
1567 | * Sends copies of a frame with multicast destination to any node with a | |
1568 | * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A | |
1569 | * transmission is performed via a batman-adv unicast packet for each such | |
1570 | * destination node. | |
1571 | * | |
1572 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family | |
1573 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. | |
1574 | */ | |
1575 | static int | |
1576 | batadv_mcast_forw_want_all(struct batadv_priv *bat_priv, | |
1577 | struct sk_buff *skb, unsigned short vid) | |
1578 | { | |
1579 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
1580 | case ETH_P_IP: | |
1581 | return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid); | |
1582 | case ETH_P_IPV6: | |
1583 | return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid); | |
1584 | default: | |
1585 | /* we shouldn't be here... */ | |
1586 | return NET_XMIT_DROP; | |
1587 | } | |
1588 | } | |
1589 | ||
11d458c1 LL |
1590 | /** |
1591 | * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4 | |
1592 | * @bat_priv: the bat priv with all the soft interface information | |
1593 | * @skb: the multicast packet to transmit | |
1594 | * @vid: the vlan identifier | |
1595 | * | |
1596 | * Sends copies of a frame with multicast destination to any node with a | |
1597 | * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a | |
1598 | * batman-adv unicast packet for each such destination node. | |
1599 | * | |
1600 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS | |
1601 | * otherwise. | |
1602 | */ | |
1603 | static int | |
1604 | batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv, | |
1605 | struct sk_buff *skb, unsigned short vid) | |
1606 | { | |
1607 | struct batadv_orig_node *orig_node; | |
1608 | int ret = NET_XMIT_SUCCESS; | |
1609 | struct sk_buff *newskb; | |
1610 | ||
1611 | rcu_read_lock(); | |
1612 | hlist_for_each_entry_rcu(orig_node, | |
1613 | &bat_priv->mcast.want_all_rtr4_list, | |
1614 | mcast_want_all_rtr4_node) { | |
1615 | newskb = skb_copy(skb, GFP_ATOMIC); | |
1616 | if (!newskb) { | |
1617 | ret = NET_XMIT_DROP; | |
1618 | break; | |
1619 | } | |
1620 | ||
1621 | batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0, | |
1622 | orig_node, vid); | |
1623 | } | |
1624 | rcu_read_unlock(); | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | /** | |
1629 | * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6 | |
1630 | * @bat_priv: the bat priv with all the soft interface information | |
1631 | * @skb: The multicast packet to transmit | |
1632 | * @vid: the vlan identifier | |
1633 | * | |
1634 | * Sends copies of a frame with multicast destination to any node with a | |
1635 | * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a | |
1636 | * batman-adv unicast packet for each such destination node. | |
1637 | * | |
1638 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS | |
1639 | * otherwise. | |
1640 | */ | |
1641 | static int | |
1642 | batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv, | |
1643 | struct sk_buff *skb, unsigned short vid) | |
1644 | { | |
1645 | struct batadv_orig_node *orig_node; | |
1646 | int ret = NET_XMIT_SUCCESS; | |
1647 | struct sk_buff *newskb; | |
1648 | ||
1649 | rcu_read_lock(); | |
1650 | hlist_for_each_entry_rcu(orig_node, | |
1651 | &bat_priv->mcast.want_all_rtr6_list, | |
1652 | mcast_want_all_rtr6_node) { | |
1653 | newskb = skb_copy(skb, GFP_ATOMIC); | |
1654 | if (!newskb) { | |
1655 | ret = NET_XMIT_DROP; | |
1656 | break; | |
1657 | } | |
1658 | ||
1659 | batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0, | |
1660 | orig_node, vid); | |
1661 | } | |
1662 | rcu_read_unlock(); | |
1663 | return ret; | |
1664 | } | |
1665 | ||
1666 | /** | |
1667 | * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list | |
1668 | * @bat_priv: the bat priv with all the soft interface information | |
1669 | * @skb: the multicast packet to transmit | |
1670 | * @vid: the vlan identifier | |
1671 | * | |
1672 | * Sends copies of a frame with multicast destination to any node with a | |
1673 | * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A | |
1674 | * transmission is performed via a batman-adv unicast packet for each such | |
1675 | * destination node. | |
1676 | * | |
1677 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family | |
1678 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. | |
1679 | */ | |
1680 | static int | |
1681 | batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv, | |
1682 | struct sk_buff *skb, unsigned short vid) | |
1683 | { | |
1684 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
1685 | case ETH_P_IP: | |
1686 | return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid); | |
1687 | case ETH_P_IPV6: | |
1688 | return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid); | |
1689 | default: | |
1690 | /* we shouldn't be here... */ | |
1691 | return NET_XMIT_DROP; | |
1692 | } | |
1693 | } | |
1694 | ||
32e72744 LL |
1695 | /** |
1696 | * batadv_mcast_forw_send() - send packet to any detected multicast recpient | |
1697 | * @bat_priv: the bat priv with all the soft interface information | |
1698 | * @skb: the multicast packet to transmit | |
1699 | * @vid: the vlan identifier | |
1700 | * | |
1701 | * Sends copies of a frame with multicast destination to any node that signaled | |
1702 | * interest in it, that is either via the translation table or the according | |
1703 | * want-all flags. A transmission is performed via a batman-adv unicast packet | |
1704 | * for each such destination node. | |
1705 | * | |
1706 | * The given skb is consumed/freed. | |
1707 | * | |
1708 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family | |
1709 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. | |
1710 | */ | |
1711 | int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1712 | unsigned short vid) | |
1713 | { | |
1714 | int ret; | |
1715 | ||
1716 | ret = batadv_mcast_forw_tt(bat_priv, skb, vid); | |
1717 | if (ret != NET_XMIT_SUCCESS) { | |
1718 | kfree_skb(skb); | |
1719 | return ret; | |
1720 | } | |
1721 | ||
1722 | ret = batadv_mcast_forw_want_all(bat_priv, skb, vid); | |
1723 | if (ret != NET_XMIT_SUCCESS) { | |
1724 | kfree_skb(skb); | |
1725 | return ret; | |
1726 | } | |
1727 | ||
11d458c1 LL |
1728 | ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid); |
1729 | if (ret != NET_XMIT_SUCCESS) { | |
1730 | kfree_skb(skb); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
32e72744 LL |
1734 | consume_skb(skb); |
1735 | return ret; | |
1d8ab8d3 LL |
1736 | } |
1737 | ||
ab49886e | 1738 | /** |
7e9a8c2c | 1739 | * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list |
ab49886e LL |
1740 | * @bat_priv: the bat priv with all the soft interface information |
1741 | * @orig: the orig_node which multicast state might have changed of | |
1742 | * @mcast_flags: flags indicating the new multicast state | |
1743 | * | |
1744 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, | |
1745 | * orig, has toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1746 | * |
1747 | * Caller needs to hold orig->mcast_handler_lock. | |
ab49886e LL |
1748 | */ |
1749 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, | |
1750 | struct batadv_orig_node *orig, | |
6b5e971a | 1751 | u8 mcast_flags) |
ab49886e | 1752 | { |
8a4023c5 LL |
1753 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
1754 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; | |
1755 | ||
5274cd68 SE |
1756 | lockdep_assert_held(&orig->mcast_handler_lock); |
1757 | ||
ab49886e LL |
1758 | /* switched from flag unset to set */ |
1759 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && | |
1760 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { | |
1761 | atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); | |
1762 | ||
1763 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1764 | /* flag checks above + mcast_handler_lock prevents this */ |
1765 | WARN_ON(!hlist_unhashed(node)); | |
1766 | ||
1767 | hlist_add_head_rcu(node, head); | |
ab49886e LL |
1768 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1769 | /* switched from flag set to unset */ | |
1770 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && | |
1771 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { | |
1772 | atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); | |
1773 | ||
1774 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1775 | /* flag checks above + mcast_handler_lock prevents this */ |
1776 | WARN_ON(hlist_unhashed(node)); | |
1777 | ||
1778 | hlist_del_init_rcu(node); | |
ab49886e LL |
1779 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1780 | } | |
1781 | } | |
1782 | ||
4c8755d6 | 1783 | /** |
7e9a8c2c | 1784 | * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list |
4c8755d6 LL |
1785 | * @bat_priv: the bat priv with all the soft interface information |
1786 | * @orig: the orig_node which multicast state might have changed of | |
1787 | * @mcast_flags: flags indicating the new multicast state | |
1788 | * | |
1789 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has | |
1790 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1791 | * |
1792 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1793 | */ |
1794 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, | |
1795 | struct batadv_orig_node *orig, | |
6b5e971a | 1796 | u8 mcast_flags) |
4c8755d6 | 1797 | { |
8a4023c5 LL |
1798 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
1799 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; | |
1800 | ||
5274cd68 SE |
1801 | lockdep_assert_held(&orig->mcast_handler_lock); |
1802 | ||
4c8755d6 LL |
1803 | /* switched from flag unset to set */ |
1804 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && | |
1805 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { | |
1806 | atomic_inc(&bat_priv->mcast.num_want_all_ipv4); | |
1807 | ||
1808 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1809 | /* flag checks above + mcast_handler_lock prevents this */ |
1810 | WARN_ON(!hlist_unhashed(node)); | |
1811 | ||
1812 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1813 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1814 | /* switched from flag set to unset */ | |
1815 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && | |
1816 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { | |
1817 | atomic_dec(&bat_priv->mcast.num_want_all_ipv4); | |
1818 | ||
1819 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1820 | /* flag checks above + mcast_handler_lock prevents this */ |
1821 | WARN_ON(hlist_unhashed(node)); | |
1822 | ||
1823 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1824 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1825 | } | |
1826 | } | |
1827 | ||
1828 | /** | |
7e9a8c2c | 1829 | * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list |
4c8755d6 LL |
1830 | * @bat_priv: the bat priv with all the soft interface information |
1831 | * @orig: the orig_node which multicast state might have changed of | |
1832 | * @mcast_flags: flags indicating the new multicast state | |
1833 | * | |
1834 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has | |
1835 | * toggled then this method updates counter and list accordingly. | |
8a4023c5 LL |
1836 | * |
1837 | * Caller needs to hold orig->mcast_handler_lock. | |
4c8755d6 LL |
1838 | */ |
1839 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, | |
1840 | struct batadv_orig_node *orig, | |
6b5e971a | 1841 | u8 mcast_flags) |
4c8755d6 | 1842 | { |
8a4023c5 LL |
1843 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1844 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; | |
1845 | ||
5274cd68 SE |
1846 | lockdep_assert_held(&orig->mcast_handler_lock); |
1847 | ||
4c8755d6 LL |
1848 | /* switched from flag unset to set */ |
1849 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && | |
1850 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { | |
1851 | atomic_inc(&bat_priv->mcast.num_want_all_ipv6); | |
1852 | ||
1853 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1854 | /* flag checks above + mcast_handler_lock prevents this */ |
1855 | WARN_ON(!hlist_unhashed(node)); | |
1856 | ||
1857 | hlist_add_head_rcu(node, head); | |
4c8755d6 LL |
1858 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1859 | /* switched from flag set to unset */ | |
1860 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && | |
1861 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { | |
1862 | atomic_dec(&bat_priv->mcast.num_want_all_ipv6); | |
1863 | ||
1864 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
8a4023c5 LL |
1865 | /* flag checks above + mcast_handler_lock prevents this */ |
1866 | WARN_ON(hlist_unhashed(node)); | |
1867 | ||
1868 | hlist_del_init_rcu(node); | |
4c8755d6 LL |
1869 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); |
1870 | } | |
1871 | } | |
1872 | ||
61caf3d1 LL |
1873 | /** |
1874 | * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list | |
1875 | * @bat_priv: the bat priv with all the soft interface information | |
1876 | * @orig: the orig_node which multicast state might have changed of | |
1877 | * @mcast_flags: flags indicating the new multicast state | |
1878 | * | |
1879 | * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has | |
1880 | * toggled then this method updates counter and list accordingly. | |
1881 | * | |
1882 | * Caller needs to hold orig->mcast_handler_lock. | |
1883 | */ | |
1884 | static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv, | |
1885 | struct batadv_orig_node *orig, | |
1886 | u8 mcast_flags) | |
1887 | { | |
1888 | struct hlist_node *node = &orig->mcast_want_all_rtr4_node; | |
1889 | struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list; | |
1890 | ||
1891 | lockdep_assert_held(&orig->mcast_handler_lock); | |
1892 | ||
1893 | /* switched from flag set to unset */ | |
1894 | if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) && | |
1895 | orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) { | |
1896 | atomic_inc(&bat_priv->mcast.num_want_all_rtr4); | |
1897 | ||
1898 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
1899 | /* flag checks above + mcast_handler_lock prevents this */ | |
1900 | WARN_ON(!hlist_unhashed(node)); | |
1901 | ||
1902 | hlist_add_head_rcu(node, head); | |
1903 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
1904 | /* switched from flag unset to set */ | |
1905 | } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 && | |
1906 | !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) { | |
1907 | atomic_dec(&bat_priv->mcast.num_want_all_rtr4); | |
1908 | ||
1909 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
1910 | /* flag checks above + mcast_handler_lock prevents this */ | |
1911 | WARN_ON(hlist_unhashed(node)); | |
1912 | ||
1913 | hlist_del_init_rcu(node); | |
1914 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | /** | |
1919 | * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list | |
1920 | * @bat_priv: the bat priv with all the soft interface information | |
1921 | * @orig: the orig_node which multicast state might have changed of | |
1922 | * @mcast_flags: flags indicating the new multicast state | |
1923 | * | |
1924 | * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has | |
1925 | * toggled then this method updates counter and list accordingly. | |
1926 | * | |
1927 | * Caller needs to hold orig->mcast_handler_lock. | |
1928 | */ | |
1929 | static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv, | |
1930 | struct batadv_orig_node *orig, | |
1931 | u8 mcast_flags) | |
1932 | { | |
1933 | struct hlist_node *node = &orig->mcast_want_all_rtr6_node; | |
1934 | struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list; | |
1935 | ||
1936 | lockdep_assert_held(&orig->mcast_handler_lock); | |
1937 | ||
1938 | /* switched from flag set to unset */ | |
1939 | if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) && | |
1940 | orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) { | |
1941 | atomic_inc(&bat_priv->mcast.num_want_all_rtr6); | |
1942 | ||
1943 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
1944 | /* flag checks above + mcast_handler_lock prevents this */ | |
1945 | WARN_ON(!hlist_unhashed(node)); | |
1946 | ||
1947 | hlist_add_head_rcu(node, head); | |
1948 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
1949 | /* switched from flag unset to set */ | |
1950 | } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 && | |
1951 | !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) { | |
1952 | atomic_dec(&bat_priv->mcast.num_want_all_rtr6); | |
1953 | ||
1954 | spin_lock_bh(&bat_priv->mcast.want_lists_lock); | |
1955 | /* flag checks above + mcast_handler_lock prevents this */ | |
1956 | WARN_ON(hlist_unhashed(node)); | |
1957 | ||
1958 | hlist_del_init_rcu(node); | |
1959 | spin_unlock_bh(&bat_priv->mcast.want_lists_lock); | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | /** | |
1964 | * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV | |
1965 | * @enabled: whether the originator has multicast TVLV support enabled | |
1966 | * @tvlv_value: tvlv buffer containing the multicast flags | |
1967 | * @tvlv_value_len: tvlv buffer length | |
1968 | * | |
1969 | * Return: multicast flags for the given tvlv buffer | |
1970 | */ | |
1971 | static u8 | |
1972 | batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len) | |
1973 | { | |
1974 | u8 mcast_flags = BATADV_NO_FLAGS; | |
1975 | ||
1976 | if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags)) | |
1977 | mcast_flags = *(u8 *)tvlv_value; | |
1978 | ||
1979 | if (!enabled) { | |
1980 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4; | |
1981 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6; | |
1982 | } | |
1983 | ||
1984 | /* remove redundant flags to avoid sending duplicate packets later */ | |
1985 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) | |
1986 | mcast_flags |= BATADV_MCAST_WANT_NO_RTR4; | |
1987 | ||
1988 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) | |
1989 | mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; | |
1990 | ||
1991 | return mcast_flags; | |
1992 | } | |
1993 | ||
60432d75 | 1994 | /** |
7e9a8c2c | 1995 | * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container |
60432d75 LL |
1996 | * @bat_priv: the bat priv with all the soft interface information |
1997 | * @orig: the orig_node of the ogm | |
1998 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
1999 | * @tvlv_value: tvlv buffer containing the multicast data | |
2000 | * @tvlv_value_len: tvlv buffer length | |
2001 | */ | |
bd2a979e LL |
2002 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
2003 | struct batadv_orig_node *orig, | |
2004 | u8 flags, | |
2005 | void *tvlv_value, | |
2006 | u16 tvlv_value_len) | |
60432d75 LL |
2007 | { |
2008 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
61caf3d1 | 2009 | u8 mcast_flags; |
8a4023c5 | 2010 | |
61caf3d1 LL |
2011 | mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled, |
2012 | tvlv_value, tvlv_value_len); | |
f26e4e98 | 2013 | |
8a4023c5 | 2014 | spin_lock_bh(&orig->mcast_handler_lock); |
60432d75 | 2015 | |
60432d75 | 2016 | if (orig_mcast_enabled && |
9c936e3f | 2017 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
9c936e3f | 2018 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 | 2019 | } else if (!orig_mcast_enabled && |
f26e4e98 | 2020 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
9c936e3f | 2021 | clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); |
60432d75 LL |
2022 | } |
2023 | ||
9c936e3f | 2024 | set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); |
60432d75 | 2025 | |
ab49886e | 2026 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
4c8755d6 LL |
2027 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
2028 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); | |
61caf3d1 LL |
2029 | batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags); |
2030 | batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags); | |
ab49886e | 2031 | |
60432d75 | 2032 | orig->mcast_flags = mcast_flags; |
8a4023c5 | 2033 | spin_unlock_bh(&orig->mcast_handler_lock); |
60432d75 LL |
2034 | } |
2035 | ||
2036 | /** | |
7e9a8c2c | 2037 | * batadv_mcast_init() - initialize the multicast optimizations structures |
60432d75 LL |
2038 | * @bat_priv: the bat priv with all the soft interface information |
2039 | */ | |
2040 | void batadv_mcast_init(struct batadv_priv *bat_priv) | |
2041 | { | |
bd2a979e LL |
2042 | batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, |
2043 | NULL, BATADV_TVLV_MCAST, 2, | |
60432d75 | 2044 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
cbebd363 LL |
2045 | |
2046 | INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); | |
2047 | batadv_mcast_start_timer(bat_priv); | |
60432d75 LL |
2048 | } |
2049 | ||
dc1cbd14 | 2050 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
4e3e823b | 2051 | /** |
7e9a8c2c | 2052 | * batadv_mcast_flags_print_header() - print own mcast flags to debugfs table |
4e3e823b LL |
2053 | * @bat_priv: the bat priv with all the soft interface information |
2054 | * @seq: debugfs table seq_file struct | |
2055 | * | |
2056 | * Prints our own multicast flags including a more specific reason why | |
2057 | * they are set, that is prints the bridge and querier state too, to | |
2058 | * the debugfs table specified via @seq. | |
2059 | */ | |
2060 | static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv, | |
2061 | struct seq_file *seq) | |
2062 | { | |
6bc45440 | 2063 | struct batadv_mcast_mla_flags *mla_flags = &bat_priv->mcast.mla_flags; |
4e3e823b | 2064 | char querier4, querier6, shadowing4, shadowing6; |
6bc45440 LL |
2065 | bool bridged = mla_flags->bridged; |
2066 | u8 flags = mla_flags->tvlv_flags; | |
4e3e823b LL |
2067 | |
2068 | if (bridged) { | |
6bc45440 LL |
2069 | querier4 = mla_flags->querier_ipv4.exists ? '.' : '4'; |
2070 | querier6 = mla_flags->querier_ipv6.exists ? '.' : '6'; | |
2071 | shadowing4 = mla_flags->querier_ipv4.shadowing ? '4' : '.'; | |
2072 | shadowing6 = mla_flags->querier_ipv6.shadowing ? '6' : '.'; | |
4e3e823b LL |
2073 | } else { |
2074 | querier4 = '?'; | |
2075 | querier6 = '?'; | |
2076 | shadowing4 = '?'; | |
2077 | shadowing6 = '?'; | |
2078 | } | |
2079 | ||
61caf3d1 | 2080 | seq_printf(seq, "Multicast flags (own flags: [%c%c%c%s%s])\n", |
4e3e823b LL |
2081 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', |
2082 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', | |
61caf3d1 LL |
2083 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', |
2084 | !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", | |
2085 | !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); | |
4e3e823b LL |
2086 | seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.'); |
2087 | seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n", | |
2088 | querier4, querier6); | |
2089 | seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n", | |
2090 | shadowing4, shadowing6); | |
2091 | seq_puts(seq, "-------------------------------------------\n"); | |
2092 | seq_printf(seq, " %-10s %s\n", "Originator", "Flags"); | |
2093 | } | |
2094 | ||
2095 | /** | |
7e9a8c2c | 2096 | * batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes |
4e3e823b LL |
2097 | * @seq: seq file to print on |
2098 | * @offset: not used | |
2099 | * | |
2100 | * This prints a table of (primary) originators and their according | |
2101 | * multicast flags, including (in the header) our own. | |
2102 | * | |
2103 | * Return: always 0 | |
2104 | */ | |
2105 | int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset) | |
2106 | { | |
2107 | struct net_device *net_dev = (struct net_device *)seq->private; | |
2108 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
2109 | struct batadv_hard_iface *primary_if; | |
2110 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
2111 | struct batadv_orig_node *orig_node; | |
2112 | struct hlist_head *head; | |
2113 | u8 flags; | |
2114 | u32 i; | |
2115 | ||
2116 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
2117 | if (!primary_if) | |
2118 | return 0; | |
2119 | ||
2120 | batadv_mcast_flags_print_header(bat_priv, seq); | |
2121 | ||
2122 | for (i = 0; i < hash->size; i++) { | |
2123 | head = &hash->table[i]; | |
2124 | ||
2125 | rcu_read_lock(); | |
2126 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
2127 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
2128 | &orig_node->capa_initialized)) | |
2129 | continue; | |
2130 | ||
2131 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
2132 | &orig_node->capabilities)) { | |
2133 | seq_printf(seq, "%pM -\n", orig_node->orig); | |
2134 | continue; | |
2135 | } | |
2136 | ||
2137 | flags = orig_node->mcast_flags; | |
2138 | ||
61caf3d1 | 2139 | seq_printf(seq, "%pM [%c%c%c%s%s]\n", orig_node->orig, |
4e3e823b LL |
2140 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) |
2141 | ? 'U' : '.', | |
2142 | (flags & BATADV_MCAST_WANT_ALL_IPV4) | |
2143 | ? '4' : '.', | |
2144 | (flags & BATADV_MCAST_WANT_ALL_IPV6) | |
61caf3d1 LL |
2145 | ? '6' : '.', |
2146 | !(flags & BATADV_MCAST_WANT_NO_RTR4) | |
2147 | ? "R4" : ". ", | |
2148 | !(flags & BATADV_MCAST_WANT_NO_RTR6) | |
2149 | ? "R6" : ". "); | |
4e3e823b LL |
2150 | } |
2151 | rcu_read_unlock(); | |
2152 | } | |
2153 | ||
2154 | batadv_hardif_put(primary_if); | |
2155 | ||
2156 | return 0; | |
2157 | } | |
dc1cbd14 | 2158 | #endif |
4e3e823b | 2159 | |
53dd9a68 LL |
2160 | /** |
2161 | * batadv_mcast_mesh_info_put() - put multicast info into a netlink message | |
2162 | * @msg: buffer for the message | |
2163 | * @bat_priv: the bat priv with all the soft interface information | |
2164 | * | |
2165 | * Return: 0 or error code. | |
2166 | */ | |
2167 | int batadv_mcast_mesh_info_put(struct sk_buff *msg, | |
2168 | struct batadv_priv *bat_priv) | |
2169 | { | |
6bc45440 | 2170 | u32 flags = bat_priv->mcast.mla_flags.tvlv_flags; |
53dd9a68 LL |
2171 | u32 flags_priv = BATADV_NO_FLAGS; |
2172 | ||
6bc45440 | 2173 | if (bat_priv->mcast.mla_flags.bridged) { |
53dd9a68 LL |
2174 | flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; |
2175 | ||
6bc45440 | 2176 | if (bat_priv->mcast.mla_flags.querier_ipv4.exists) |
53dd9a68 | 2177 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; |
6bc45440 | 2178 | if (bat_priv->mcast.mla_flags.querier_ipv6.exists) |
53dd9a68 | 2179 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; |
6bc45440 | 2180 | if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing) |
53dd9a68 | 2181 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; |
6bc45440 | 2182 | if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing) |
53dd9a68 LL |
2183 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; |
2184 | } | |
2185 | ||
2186 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) || | |
2187 | nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv)) | |
2188 | return -EMSGSIZE; | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table | |
2195 | * to a netlink socket | |
2196 | * @msg: buffer for the message | |
2197 | * @portid: netlink port | |
d2d489b7 | 2198 | * @cb: Control block containing additional options |
53dd9a68 LL |
2199 | * @orig_node: originator to dump the multicast flags of |
2200 | * | |
2201 | * Return: 0 or error code. | |
2202 | */ | |
2203 | static int | |
d2d489b7 SE |
2204 | batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, |
2205 | struct netlink_callback *cb, | |
53dd9a68 LL |
2206 | struct batadv_orig_node *orig_node) |
2207 | { | |
2208 | void *hdr; | |
2209 | ||
d2d489b7 SE |
2210 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
2211 | &batadv_netlink_family, NLM_F_MULTI, | |
2212 | BATADV_CMD_GET_MCAST_FLAGS); | |
53dd9a68 LL |
2213 | if (!hdr) |
2214 | return -ENOBUFS; | |
2215 | ||
d2d489b7 SE |
2216 | genl_dump_check_consistent(cb, hdr); |
2217 | ||
53dd9a68 LL |
2218 | if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, |
2219 | orig_node->orig)) { | |
2220 | genlmsg_cancel(msg, hdr); | |
2221 | return -EMSGSIZE; | |
2222 | } | |
2223 | ||
2224 | if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, | |
2225 | &orig_node->capabilities)) { | |
2226 | if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, | |
2227 | orig_node->mcast_flags)) { | |
2228 | genlmsg_cancel(msg, hdr); | |
2229 | return -EMSGSIZE; | |
2230 | } | |
2231 | } | |
2232 | ||
2233 | genlmsg_end(msg, hdr); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | /** | |
2238 | * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags | |
2239 | * table to a netlink socket | |
2240 | * @msg: buffer for the message | |
2241 | * @portid: netlink port | |
d2d489b7 SE |
2242 | * @cb: Control block containing additional options |
2243 | * @hash: hash to dump | |
2244 | * @bucket: bucket index to dump | |
53dd9a68 LL |
2245 | * @idx_skip: How many entries to skip |
2246 | * | |
2247 | * Return: 0 or error code. | |
2248 | */ | |
2249 | static int | |
d2d489b7 SE |
2250 | batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, |
2251 | struct netlink_callback *cb, | |
2252 | struct batadv_hashtable *hash, | |
2253 | unsigned int bucket, long *idx_skip) | |
53dd9a68 LL |
2254 | { |
2255 | struct batadv_orig_node *orig_node; | |
2256 | long idx = 0; | |
2257 | ||
d2d489b7 SE |
2258 | spin_lock_bh(&hash->list_locks[bucket]); |
2259 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
2260 | ||
2261 | hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) { | |
53dd9a68 LL |
2262 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
2263 | &orig_node->capa_initialized)) | |
2264 | continue; | |
2265 | ||
2266 | if (idx < *idx_skip) | |
2267 | goto skip; | |
2268 | ||
d2d489b7 SE |
2269 | if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) { |
2270 | spin_unlock_bh(&hash->list_locks[bucket]); | |
53dd9a68 LL |
2271 | *idx_skip = idx; |
2272 | ||
2273 | return -EMSGSIZE; | |
2274 | } | |
2275 | ||
2276 | skip: | |
2277 | idx++; | |
2278 | } | |
d2d489b7 | 2279 | spin_unlock_bh(&hash->list_locks[bucket]); |
53dd9a68 LL |
2280 | |
2281 | return 0; | |
2282 | } | |
2283 | ||
2284 | /** | |
2285 | * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
2286 | * @msg: buffer for the message | |
2287 | * @portid: netlink port | |
d2d489b7 | 2288 | * @cb: Control block containing additional options |
53dd9a68 LL |
2289 | * @bat_priv: the bat priv with all the soft interface information |
2290 | * @bucket: current bucket to dump | |
2291 | * @idx: index in current bucket to the next entry to dump | |
2292 | * | |
2293 | * Return: 0 or error code. | |
2294 | */ | |
2295 | static int | |
d2d489b7 SE |
2296 | __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, |
2297 | struct netlink_callback *cb, | |
53dd9a68 LL |
2298 | struct batadv_priv *bat_priv, long *bucket, long *idx) |
2299 | { | |
2300 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
2301 | long bucket_tmp = *bucket; | |
53dd9a68 LL |
2302 | long idx_tmp = *idx; |
2303 | ||
2304 | while (bucket_tmp < hash->size) { | |
d2d489b7 | 2305 | if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash, |
fa3a03da | 2306 | bucket_tmp, &idx_tmp)) |
53dd9a68 LL |
2307 | break; |
2308 | ||
2309 | bucket_tmp++; | |
2310 | idx_tmp = 0; | |
2311 | } | |
2312 | ||
2313 | *bucket = bucket_tmp; | |
2314 | *idx = idx_tmp; | |
2315 | ||
2316 | return msg->len; | |
2317 | } | |
2318 | ||
2319 | /** | |
2320 | * batadv_mcast_netlink_get_primary() - get primary interface from netlink | |
2321 | * callback | |
2322 | * @cb: netlink callback structure | |
2323 | * @primary_if: the primary interface pointer to return the result in | |
2324 | * | |
2325 | * Return: 0 or error code. | |
2326 | */ | |
2327 | static int | |
2328 | batadv_mcast_netlink_get_primary(struct netlink_callback *cb, | |
2329 | struct batadv_hard_iface **primary_if) | |
2330 | { | |
2331 | struct batadv_hard_iface *hard_iface = NULL; | |
2332 | struct net *net = sock_net(cb->skb->sk); | |
2333 | struct net_device *soft_iface; | |
2334 | struct batadv_priv *bat_priv; | |
2335 | int ifindex; | |
2336 | int ret = 0; | |
2337 | ||
2338 | ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); | |
2339 | if (!ifindex) | |
2340 | return -EINVAL; | |
2341 | ||
2342 | soft_iface = dev_get_by_index(net, ifindex); | |
2343 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2344 | ret = -ENODEV; | |
2345 | goto out; | |
2346 | } | |
2347 | ||
2348 | bat_priv = netdev_priv(soft_iface); | |
2349 | ||
2350 | hard_iface = batadv_primary_if_get_selected(bat_priv); | |
2351 | if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { | |
2352 | ret = -ENOENT; | |
2353 | goto out; | |
2354 | } | |
2355 | ||
2356 | out: | |
2357 | if (soft_iface) | |
2358 | dev_put(soft_iface); | |
2359 | ||
2360 | if (!ret && primary_if) | |
2361 | *primary_if = hard_iface; | |
65cc02a8 | 2362 | else if (hard_iface) |
53dd9a68 LL |
2363 | batadv_hardif_put(hard_iface); |
2364 | ||
2365 | return ret; | |
2366 | } | |
2367 | ||
2368 | /** | |
2369 | * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket | |
2370 | * @msg: buffer for the message | |
2371 | * @cb: callback structure containing arguments | |
2372 | * | |
2373 | * Return: message length. | |
2374 | */ | |
2375 | int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2376 | { | |
2377 | struct batadv_hard_iface *primary_if = NULL; | |
2378 | int portid = NETLINK_CB(cb->skb).portid; | |
2379 | struct batadv_priv *bat_priv; | |
2380 | long *bucket = &cb->args[0]; | |
2381 | long *idx = &cb->args[1]; | |
2382 | int ret; | |
2383 | ||
2384 | ret = batadv_mcast_netlink_get_primary(cb, &primary_if); | |
2385 | if (ret) | |
2386 | return ret; | |
2387 | ||
2388 | bat_priv = netdev_priv(primary_if->soft_iface); | |
d2d489b7 | 2389 | ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx); |
53dd9a68 LL |
2390 | |
2391 | batadv_hardif_put(primary_if); | |
2392 | return ret; | |
2393 | } | |
2394 | ||
c5caf4ef | 2395 | /** |
7e9a8c2c | 2396 | * batadv_mcast_free() - free the multicast optimizations structures |
c5caf4ef LL |
2397 | * @bat_priv: the bat priv with all the soft interface information |
2398 | */ | |
2399 | void batadv_mcast_free(struct batadv_priv *bat_priv) | |
2400 | { | |
cbebd363 LL |
2401 | cancel_delayed_work_sync(&bat_priv->mcast.work); |
2402 | ||
bd2a979e LL |
2403 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); |
2404 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); | |
60432d75 | 2405 | |
cbebd363 | 2406 | /* safely calling outside of worker, as worker was canceled above */ |
c5caf4ef LL |
2407 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
2408 | } | |
60432d75 LL |
2409 | |
2410 | /** | |
7e9a8c2c | 2411 | * batadv_mcast_purge_orig() - reset originator global mcast state modifications |
60432d75 LL |
2412 | * @orig: the originator which is going to get purged |
2413 | */ | |
2414 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) | |
2415 | { | |
2416 | struct batadv_priv *bat_priv = orig->bat_priv; | |
2417 | ||
8a4023c5 LL |
2418 | spin_lock_bh(&orig->mcast_handler_lock); |
2419 | ||
ab49886e | 2420 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); |
4c8755d6 LL |
2421 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
2422 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
61caf3d1 LL |
2423 | batadv_mcast_want_rtr4_update(bat_priv, orig, BATADV_NO_FLAGS); |
2424 | batadv_mcast_want_rtr6_update(bat_priv, orig, BATADV_NO_FLAGS); | |
8a4023c5 LL |
2425 | |
2426 | spin_unlock_bh(&orig->mcast_handler_lock); | |
60432d75 | 2427 | } |