1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
3 | * |
4 | * Linus Lüssing |
5 | */ |
6 | |
7 | #include "multicast.h" |
8 | #include "main.h" |
9 | |
10 | #include <linux/atomic.h> |
11 | #include <linux/bitops.h> |
12 | #include <linux/bug.h> |
13 | #include <linux/byteorder/generic.h> |
14 | #include <linux/container_of.h> |
15 | #include <linux/errno.h> |
16 | #include <linux/etherdevice.h> |
17 | #include <linux/gfp.h> |
18 | #include <linux/icmpv6.h> |
19 | #include <linux/if_bridge.h> |
20 | #include <linux/if_ether.h> |
21 | #include <linux/igmp.h> |
22 | #include <linux/in.h> |
23 | #include <linux/in6.h> |
24 | #include <linux/inetdevice.h> |
25 | #include <linux/ip.h> |
26 | #include <linux/ipv6.h> |
27 | #include <linux/jiffies.h> |
28 | #include <linux/list.h> |
29 | #include <linux/lockdep.h> |
30 | #include <linux/netdevice.h> |
31 | #include <linux/netlink.h> |
32 | #include <linux/printk.h> |
33 | #include <linux/rculist.h> |
34 | #include <linux/rcupdate.h> |
35 | #include <linux/skbuff.h> |
36 | #include <linux/slab.h> |
37 | #include <linux/spinlock.h> |
38 | #include <linux/sprintf.h> |
39 | #include <linux/stddef.h> |
40 | #include <linux/string.h> |
41 | #include <linux/types.h> |
42 | #include <linux/workqueue.h> |
43 | #include <net/addrconf.h> |
44 | #include <net/genetlink.h> |
45 | #include <net/if_inet6.h> |
46 | #include <net/ip.h> |
47 | #include <net/ipv6.h> |
48 | #include <net/netlink.h> |
49 | #include <net/sock.h> |
50 | #include <uapi/linux/batadv_packet.h> |
51 | #include <uapi/linux/batman_adv.h> |
52 | |
53 | #include "bridge_loop_avoidance.h" |
54 | #include "hard-interface.h" |
55 | #include "hash.h" |
56 | #include "log.h" |
57 | #include "netlink.h" |
58 | #include "send.h" |
59 | #include "soft-interface.h" |
60 | #include "translation-table.h" |
61 | #include "tvlv.h" |
62 | |
63 | static void batadv_mcast_mla_update(struct work_struct *work); |
64 | |
65 | /** |
66 | * batadv_mcast_start_timer() - schedule the multicast periodic worker |
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(wq: batadv_event_workqueue, dwork: &bat_priv->mcast.work, |
72 | delay: msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); |
73 | } |
74 | |
75 | /** |
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 |
78 | * |
79 | * If the given soft interface has a bridge on top then the refcount |
80 | * of the according net device is increased. |
81 | * |
82 | * Return: NULL if no such bridge exists. Otherwise the net device of the |
83 | * bridge. |
84 | */ |
85 | static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) |
86 | { |
87 | struct net_device *upper = soft_iface; |
88 | |
89 | rcu_read_lock(); |
90 | do { |
91 | upper = netdev_master_upper_dev_get_rcu(dev: upper); |
92 | } while (upper && !netif_is_bridge_master(dev: upper)); |
93 | |
94 | dev_hold(dev: upper); |
95 | rcu_read_unlock(); |
96 | |
97 | return upper; |
98 | } |
99 | |
100 | /** |
101 | * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from |
102 | * node for IPv4 |
103 | * @dev: the interface to check |
104 | * |
105 | * Checks the presence of an IPv4 multicast router on this node. |
106 | * |
107 | * Caller needs to hold rcu read lock. |
108 | * |
109 | * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise. |
110 | */ |
111 | static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev) |
112 | { |
113 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
114 | |
115 | if (in_dev && IN_DEV_MFORWARD(in_dev)) |
116 | return BATADV_NO_FLAGS; |
117 | else |
118 | return BATADV_MCAST_WANT_NO_RTR4; |
119 | } |
120 | |
121 | /** |
122 | * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from |
123 | * node for IPv6 |
124 | * @dev: the interface to check |
125 | * |
126 | * Checks the presence of an IPv6 multicast router on this node. |
127 | * |
128 | * Caller needs to hold rcu read lock. |
129 | * |
130 | * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise. |
131 | */ |
132 | #if IS_ENABLED(CONFIG_IPV6_MROUTE) |
133 | static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) |
134 | { |
135 | struct inet6_dev *in6_dev = __in6_dev_get(dev); |
136 | |
137 | if (in6_dev && atomic_read(v: &in6_dev->cnf.mc_forwarding)) |
138 | return BATADV_NO_FLAGS; |
139 | else |
140 | return BATADV_MCAST_WANT_NO_RTR6; |
141 | } |
142 | #else |
143 | static inline u8 |
144 | batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) |
145 | { |
146 | return BATADV_MCAST_WANT_NO_RTR6; |
147 | } |
148 | #endif |
149 | |
150 | /** |
151 | * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node |
152 | * @bat_priv: the bat priv with all the soft interface information |
153 | * @bridge: bridge interface on top of the soft_iface if present, |
154 | * otherwise pass NULL |
155 | * |
156 | * Checks the presence of IPv4 and IPv6 multicast routers on this |
157 | * node. |
158 | * |
159 | * Return: |
160 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present |
161 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present |
162 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present |
163 | * The former two OR'd: no multicast router is present |
164 | */ |
165 | static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv, |
166 | struct net_device *bridge) |
167 | { |
168 | struct net_device *dev = bridge ? bridge : bat_priv->soft_iface; |
169 | u8 flags = BATADV_NO_FLAGS; |
170 | |
171 | rcu_read_lock(); |
172 | |
173 | flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev); |
174 | flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev); |
175 | |
176 | rcu_read_unlock(); |
177 | |
178 | return flags; |
179 | } |
180 | |
181 | /** |
182 | * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge |
183 | * @bat_priv: the bat priv with all the soft interface information |
184 | * @bridge: bridge interface on top of the soft_iface if present, |
185 | * otherwise pass NULL |
186 | * |
187 | * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge. |
188 | * |
189 | * Return: |
190 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present |
191 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present |
192 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present |
193 | * The former two OR'd: no multicast router is present |
194 | */ |
195 | static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, |
196 | struct net_device *bridge) |
197 | { |
198 | struct net_device *dev = bat_priv->soft_iface; |
199 | u8 flags = BATADV_NO_FLAGS; |
200 | |
201 | if (!bridge) |
202 | return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; |
203 | |
204 | if (!br_multicast_has_router_adjacent(dev, ETH_P_IP)) |
205 | flags |= BATADV_MCAST_WANT_NO_RTR4; |
206 | if (!br_multicast_has_router_adjacent(dev, ETH_P_IPV6)) |
207 | flags |= BATADV_MCAST_WANT_NO_RTR6; |
208 | |
209 | return flags; |
210 | } |
211 | |
212 | /** |
213 | * batadv_mcast_mla_rtr_flags_get() - get multicast router flags |
214 | * @bat_priv: the bat priv with all the soft interface information |
215 | * @bridge: bridge interface on top of the soft_iface if present, |
216 | * otherwise pass NULL |
217 | * |
218 | * Checks the presence of IPv4 and IPv6 multicast routers on this |
219 | * node or behind its bridge. |
220 | * |
221 | * Return: |
222 | * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present |
223 | * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present |
224 | * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present |
225 | * The former two OR'd: no multicast router is present |
226 | */ |
227 | static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv, |
228 | struct net_device *bridge) |
229 | { |
230 | u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; |
231 | |
232 | flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge); |
233 | flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge); |
234 | |
235 | return flags; |
236 | } |
237 | |
238 | /** |
239 | * batadv_mcast_mla_forw_flags_get() - get multicast forwarding flags |
240 | * @bat_priv: the bat priv with all the soft interface information |
241 | * |
242 | * Checks if all active hard interfaces have an MTU larger or equal to 1280 |
243 | * bytes (IPv6 minimum MTU). |
244 | * |
245 | * Return: BATADV_MCAST_HAVE_MC_PTYPE_CAPA if yes, BATADV_NO_FLAGS otherwise. |
246 | */ |
247 | static u8 batadv_mcast_mla_forw_flags_get(struct batadv_priv *bat_priv) |
248 | { |
249 | const struct batadv_hard_iface *hard_iface; |
250 | |
251 | rcu_read_lock(); |
252 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
253 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
254 | continue; |
255 | |
256 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
257 | continue; |
258 | |
259 | if (hard_iface->net_dev->mtu < IPV6_MIN_MTU) { |
260 | rcu_read_unlock(); |
261 | return BATADV_NO_FLAGS; |
262 | } |
263 | } |
264 | rcu_read_unlock(); |
265 | |
266 | return BATADV_MCAST_HAVE_MC_PTYPE_CAPA; |
267 | } |
268 | |
269 | /** |
270 | * batadv_mcast_mla_flags_get() - get the new multicast flags |
271 | * @bat_priv: the bat priv with all the soft interface information |
272 | * |
273 | * Return: A set of flags for the current/next TVLV, querier and |
274 | * bridge state. |
275 | */ |
276 | static struct batadv_mcast_mla_flags |
277 | batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv) |
278 | { |
279 | struct net_device *dev = bat_priv->soft_iface; |
280 | struct batadv_mcast_querier_state *qr4, *qr6; |
281 | struct batadv_mcast_mla_flags mla_flags; |
282 | struct net_device *bridge; |
283 | |
284 | bridge = batadv_mcast_get_bridge(soft_iface: dev); |
285 | |
286 | memset(&mla_flags, 0, sizeof(mla_flags)); |
287 | mla_flags.enabled = 1; |
288 | mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv, |
289 | bridge); |
290 | mla_flags.tvlv_flags |= batadv_mcast_mla_forw_flags_get(bat_priv); |
291 | |
292 | if (!bridge) |
293 | return mla_flags; |
294 | |
295 | dev_put(dev: bridge); |
296 | |
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 | */ |
321 | if (!qr4->exists || qr4->shadowing) { |
322 | mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4; |
323 | mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4; |
324 | } |
325 | |
326 | if (!qr6->exists || qr6->shadowing) { |
327 | mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6; |
328 | mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6; |
329 | } |
330 | |
331 | return mla_flags; |
332 | } |
333 | |
334 | /** |
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 |
338 | * |
339 | * Return: true if the given address is already in the given list. |
340 | * Otherwise returns false. |
341 | */ |
342 | static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, |
343 | struct hlist_head *mcast_list) |
344 | { |
345 | struct batadv_hw_addr *mcast_entry; |
346 | |
347 | hlist_for_each_entry(mcast_entry, mcast_list, list) |
348 | if (batadv_compare_eth(data1: mcast_entry->addr, data2: mcast_addr)) |
349 | return true; |
350 | |
351 | return false; |
352 | } |
353 | |
354 | /** |
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 |
359 | * |
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. |
367 | */ |
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) |
372 | { |
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(); |
383 | |
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)) { |
392 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
393 | ipv4_is_local_multicast(addr: pmc->multiaddr)) |
394 | continue; |
395 | |
396 | if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && |
397 | !ipv4_is_local_multicast(addr: pmc->multiaddr)) |
398 | continue; |
399 | |
400 | ip_eth_mc_map(naddr: pmc->multiaddr, buf: mcast_addr); |
401 | |
402 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) |
403 | continue; |
404 | |
405 | new = kmalloc(size: sizeof(*new), GFP_ATOMIC); |
406 | if (!new) { |
407 | ret = -ENOMEM; |
408 | break; |
409 | } |
410 | |
411 | ether_addr_copy(dst: new->addr, src: mcast_addr); |
412 | hlist_add_head(n: &new->list, h: mcast_list); |
413 | ret++; |
414 | } |
415 | rcu_read_unlock(); |
416 | |
417 | return ret; |
418 | } |
419 | |
420 | /** |
421 | * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners |
422 | * @dev: the device to collect multicast addresses from |
423 | * @mcast_list: a list to put found addresses into |
424 | * @flags: flags indicating the new multicast state |
425 | * |
426 | * Collects multicast addresses of IPv6 multicast listeners residing |
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 | * |
431 | * Return: -ENOMEM on memory allocation error or the number of |
432 | * items added to the mcast_list otherwise. |
433 | */ |
434 | #if IS_ENABLED(CONFIG_IPV6) |
435 | static int |
436 | batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, |
437 | struct hlist_head *mcast_list, |
438 | struct batadv_mcast_mla_flags *flags) |
439 | { |
440 | struct batadv_hw_addr *new; |
441 | struct inet6_dev *in6_dev; |
442 | u8 mcast_addr[ETH_ALEN]; |
443 | struct ifmcaddr6 *pmc6; |
444 | int ret = 0; |
445 | |
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 | for (pmc6 = rcu_dereference(in6_dev->mc_list); |
458 | pmc6; |
459 | pmc6 = rcu_dereference(pmc6->next)) { |
460 | if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) < |
461 | IPV6_ADDR_SCOPE_LINKLOCAL) |
462 | continue; |
463 | |
464 | if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
465 | ipv6_addr_is_ll_all_nodes(addr: &pmc6->mca_addr)) |
466 | continue; |
467 | |
468 | if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && |
469 | IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) > |
470 | IPV6_ADDR_SCOPE_LINKLOCAL) |
471 | continue; |
472 | |
473 | ipv6_eth_mc_map(addr: &pmc6->mca_addr, buf: mcast_addr); |
474 | |
475 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) |
476 | continue; |
477 | |
478 | new = kmalloc(size: sizeof(*new), GFP_ATOMIC); |
479 | if (!new) { |
480 | ret = -ENOMEM; |
481 | break; |
482 | } |
483 | |
484 | ether_addr_copy(dst: new->addr, src: mcast_addr); |
485 | hlist_add_head(n: &new->list, h: mcast_list); |
486 | ret++; |
487 | } |
488 | rcu_read_unlock(); |
489 | |
490 | return ret; |
491 | } |
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 |
501 | |
502 | /** |
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 |
507 | * |
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, collect 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. |
520 | */ |
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) |
525 | { |
526 | struct net_device *bridge = batadv_mcast_get_bridge(soft_iface: dev); |
527 | int ret4, ret6 = 0; |
528 | |
529 | if (bridge) |
530 | dev = bridge; |
531 | |
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 | dev_put(dev: bridge); |
544 | |
545 | return ret4 + ret6; |
546 | } |
547 | |
548 | /** |
549 | * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address |
550 | * @dst: destination to write to - a multicast MAC address |
551 | * @src: source to read from - a multicast IP address |
552 | * |
553 | * Converts a given multicast IPv4/IPv6 address from a bridge |
554 | * to its matching multicast MAC address and copies it into the given |
555 | * destination buffer. |
556 | * |
557 | * Caller needs to make sure the destination buffer can hold |
558 | * at least ETH_ALEN bytes. |
559 | */ |
560 | static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) |
561 | { |
562 | if (src->proto == htons(ETH_P_IP)) |
563 | ip_eth_mc_map(naddr: src->dst.ip4, buf: dst); |
564 | #if IS_ENABLED(CONFIG_IPV6) |
565 | else if (src->proto == htons(ETH_P_IPV6)) |
566 | ipv6_eth_mc_map(addr: &src->dst.ip6, buf: dst); |
567 | #endif |
568 | else |
569 | eth_zero_addr(addr: dst); |
570 | } |
571 | |
572 | /** |
573 | * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners |
574 | * @dev: a bridge slave whose bridge to collect multicast addresses from |
575 | * @mcast_list: a list to put found addresses into |
576 | * @flags: flags indicating the new multicast state |
577 | * |
578 | * Collects multicast addresses of multicast listeners residing |
579 | * on foreign, non-mesh devices which we gave access to our mesh via |
580 | * a bridge on top of the given soft interface, dev, in the given |
581 | * mcast_list. |
582 | * |
583 | * Return: -ENOMEM on memory allocation error or the number of |
584 | * items added to the mcast_list otherwise. |
585 | */ |
586 | static int batadv_mcast_mla_bridge_get(struct net_device *dev, |
587 | struct hlist_head *mcast_list, |
588 | struct batadv_mcast_mla_flags *flags) |
589 | { |
590 | struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); |
591 | struct br_ip_list *br_ip_entry, *tmp; |
592 | u8 tvlv_flags = flags->tvlv_flags; |
593 | struct batadv_hw_addr *new; |
594 | u8 mcast_addr[ETH_ALEN]; |
595 | int ret; |
596 | |
597 | /* we don't need to detect these devices/listeners, the IGMP/MLD |
598 | * snooping code of the Linux bridge already does that for us |
599 | */ |
600 | ret = br_multicast_list_adjacent(dev, br_ip_list: &bridge_mcast_list); |
601 | if (ret < 0) |
602 | goto out; |
603 | |
604 | list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { |
605 | if (br_ip_entry->addr.proto == htons(ETH_P_IP)) { |
606 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) |
607 | continue; |
608 | |
609 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
610 | ipv4_is_local_multicast(addr: br_ip_entry->addr.dst.ip4)) |
611 | continue; |
612 | |
613 | if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && |
614 | !ipv4_is_local_multicast(addr: br_ip_entry->addr.dst.ip4)) |
615 | continue; |
616 | } |
617 | |
618 | #if IS_ENABLED(CONFIG_IPV6) |
619 | if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) { |
620 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) |
621 | continue; |
622 | |
623 | if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
624 | ipv6_addr_is_ll_all_nodes(addr: &br_ip_entry->addr.dst.ip6)) |
625 | continue; |
626 | |
627 | if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && |
628 | IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) > |
629 | IPV6_ADDR_SCOPE_LINKLOCAL) |
630 | continue; |
631 | } |
632 | #endif |
633 | |
634 | batadv_mcast_mla_br_addr_cpy(dst: mcast_addr, src: &br_ip_entry->addr); |
635 | if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) |
636 | continue; |
637 | |
638 | new = kmalloc(size: sizeof(*new), GFP_ATOMIC); |
639 | if (!new) { |
640 | ret = -ENOMEM; |
641 | break; |
642 | } |
643 | |
644 | ether_addr_copy(dst: new->addr, src: mcast_addr); |
645 | hlist_add_head(n: &new->list, h: mcast_list); |
646 | } |
647 | |
648 | out: |
649 | list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { |
650 | list_del(entry: &br_ip_entry->list); |
651 | kfree(objp: br_ip_entry); |
652 | } |
653 | |
654 | return ret; |
655 | } |
656 | |
657 | /** |
658 | * batadv_mcast_mla_list_free() - free a list of multicast addresses |
659 | * @mcast_list: the list to free |
660 | * |
661 | * Removes and frees all items in the given mcast_list. |
662 | */ |
663 | static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) |
664 | { |
665 | struct batadv_hw_addr *mcast_entry; |
666 | struct hlist_node *tmp; |
667 | |
668 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
669 | hlist_del(n: &mcast_entry->list); |
670 | kfree(objp: mcast_entry); |
671 | } |
672 | } |
673 | |
674 | /** |
675 | * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements |
676 | * @bat_priv: the bat priv with all the soft interface information |
677 | * @mcast_list: a list of addresses which should _not_ be removed |
678 | * |
679 | * Retracts the announcement of any multicast listener from the |
680 | * translation table except the ones listed in the given mcast_list. |
681 | * |
682 | * If mcast_list is NULL then all are retracted. |
683 | */ |
684 | static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, |
685 | struct hlist_head *mcast_list) |
686 | { |
687 | struct batadv_hw_addr *mcast_entry; |
688 | struct hlist_node *tmp; |
689 | |
690 | hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, |
691 | list) { |
692 | if (mcast_list && |
693 | batadv_mcast_mla_is_duplicate(mcast_addr: mcast_entry->addr, |
694 | mcast_list)) |
695 | continue; |
696 | |
697 | batadv_tt_local_remove(bat_priv, addr: mcast_entry->addr, |
698 | BATADV_NO_FLAGS, |
699 | message: "mcast TT outdated" , roaming: false); |
700 | |
701 | hlist_del(n: &mcast_entry->list); |
702 | kfree(objp: mcast_entry); |
703 | } |
704 | } |
705 | |
706 | /** |
707 | * batadv_mcast_mla_tt_add() - add multicast listener announcements |
708 | * @bat_priv: the bat priv with all the soft interface information |
709 | * @mcast_list: a list of addresses which are going to get added |
710 | * |
711 | * Adds multicast listener announcements from the given mcast_list to the |
712 | * translation table if they have not been added yet. |
713 | */ |
714 | static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, |
715 | struct hlist_head *mcast_list) |
716 | { |
717 | struct batadv_hw_addr *mcast_entry; |
718 | struct hlist_node *tmp; |
719 | |
720 | if (!mcast_list) |
721 | return; |
722 | |
723 | hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { |
724 | if (batadv_mcast_mla_is_duplicate(mcast_addr: mcast_entry->addr, |
725 | mcast_list: &bat_priv->mcast.mla_list)) |
726 | continue; |
727 | |
728 | if (!batadv_tt_local_add(soft_iface: bat_priv->soft_iface, |
729 | addr: mcast_entry->addr, BATADV_NO_FLAGS, |
730 | BATADV_NULL_IFINDEX, BATADV_NO_MARK)) |
731 | continue; |
732 | |
733 | hlist_del(n: &mcast_entry->list); |
734 | hlist_add_head(n: &mcast_entry->list, h: &bat_priv->mcast.mla_list); |
735 | } |
736 | } |
737 | |
738 | /** |
739 | * batadv_mcast_querier_log() - debug output regarding the querier status on |
740 | * link |
741 | * @bat_priv: the bat priv with all the soft interface information |
742 | * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") |
743 | * @old_state: the previous querier state on our link |
744 | * @new_state: the new querier state on our link |
745 | * |
746 | * Outputs debug messages to the logging facility with log level 'mcast' |
747 | * regarding changes to the querier status on the link which are relevant |
748 | * to our multicast optimizations. |
749 | * |
750 | * Usually this is about whether a querier appeared or vanished in |
751 | * our mesh or whether the querier is in the suboptimal position of being |
752 | * behind our local bridge segment: Snooping switches will directly |
753 | * forward listener reports to the querier, therefore batman-adv and |
754 | * the bridge will potentially not see these listeners - the querier is |
755 | * potentially shadowing listeners from us then. |
756 | * |
757 | * This is only interesting for nodes with a bridge on top of their |
758 | * soft interface. |
759 | */ |
760 | static void |
761 | batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, |
762 | struct batadv_mcast_querier_state *old_state, |
763 | struct batadv_mcast_querier_state *new_state) |
764 | { |
765 | if (!old_state->exists && new_state->exists) |
766 | batadv_info(bat_priv->soft_iface, "%s Querier appeared\n" , |
767 | str_proto); |
768 | else if (old_state->exists && !new_state->exists) |
769 | batadv_info(bat_priv->soft_iface, |
770 | "%s Querier disappeared - multicast optimizations disabled\n" , |
771 | str_proto); |
772 | else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists) |
773 | batadv_info(bat_priv->soft_iface, |
774 | "No %s Querier present - multicast optimizations disabled\n" , |
775 | str_proto); |
776 | |
777 | if (new_state->exists) { |
778 | if ((!old_state->shadowing && new_state->shadowing) || |
779 | (!old_state->exists && new_state->shadowing)) |
780 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
781 | "%s Querier is behind our bridged segment: Might shadow listeners\n" , |
782 | str_proto); |
783 | else if (old_state->shadowing && !new_state->shadowing) |
784 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
785 | "%s Querier is not behind our bridged segment\n" , |
786 | str_proto); |
787 | } |
788 | } |
789 | |
790 | /** |
791 | * batadv_mcast_bridge_log() - debug output for topology changes in bridged |
792 | * setups |
793 | * @bat_priv: the bat priv with all the soft interface information |
794 | * @new_flags: flags indicating the new multicast state |
795 | * |
796 | * If no bridges are ever used on this node, then this function does nothing. |
797 | * |
798 | * Otherwise this function outputs debug information to the 'mcast' log level |
799 | * which might be relevant to our multicast optimizations. |
800 | * |
801 | * More precisely, it outputs information when a bridge interface is added or |
802 | * removed from a soft interface. And when a bridge is present, it further |
803 | * outputs information about the querier state which is relevant for the |
804 | * multicast flags this node is going to set. |
805 | */ |
806 | static void |
807 | batadv_mcast_bridge_log(struct batadv_priv *bat_priv, |
808 | struct batadv_mcast_mla_flags *new_flags) |
809 | { |
810 | struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags; |
811 | |
812 | if (!old_flags->bridged && new_flags->bridged) |
813 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
814 | "Bridge added: Setting Unsnoopables(U)-flag\n" ); |
815 | else if (old_flags->bridged && !new_flags->bridged) |
816 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
817 | "Bridge removed: Unsetting Unsnoopables(U)-flag\n" ); |
818 | |
819 | if (new_flags->bridged) { |
820 | batadv_mcast_querier_log(bat_priv, str_proto: "IGMP" , |
821 | old_state: &old_flags->querier_ipv4, |
822 | new_state: &new_flags->querier_ipv4); |
823 | batadv_mcast_querier_log(bat_priv, str_proto: "MLD" , |
824 | old_state: &old_flags->querier_ipv6, |
825 | new_state: &new_flags->querier_ipv6); |
826 | } |
827 | } |
828 | |
829 | /** |
830 | * batadv_mcast_flags_log() - output debug information about mcast flag changes |
831 | * @bat_priv: the bat priv with all the soft interface information |
832 | * @flags: TVLV flags indicating the new multicast state |
833 | * |
834 | * Whenever the multicast TVLV flags this node announces change, this function |
835 | * should be used to notify userspace about the change. |
836 | */ |
837 | static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) |
838 | { |
839 | bool old_enabled = bat_priv->mcast.mla_flags.enabled; |
840 | u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags; |
841 | char str_old_flags[] = "[.... . .]" ; |
842 | |
843 | sprintf(buf: str_old_flags, fmt: "[%c%c%c%s%s%c]" , |
844 | (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', |
845 | (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', |
846 | (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', |
847 | !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". " , |
848 | !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". " , |
849 | !(old_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) ? 'P' : '.'); |
850 | |
851 | batadv_dbg(BATADV_DBG_MCAST, bat_priv, |
852 | "Changing multicast flags from '%s' to '[%c%c%c%s%s%c]'\n" , |
853 | old_enabled ? str_old_flags : "<undefined>" , |
854 | (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', |
855 | (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', |
856 | (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', |
857 | !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". " , |
858 | !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". " , |
859 | !(flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) ? 'P' : '.'); |
860 | } |
861 | |
862 | /** |
863 | * batadv_mcast_mla_flags_update() - update multicast flags |
864 | * @bat_priv: the bat priv with all the soft interface information |
865 | * @flags: flags indicating the new multicast state |
866 | * |
867 | * Updates the own multicast tvlv with our current multicast related settings, |
868 | * capabilities and inabilities. |
869 | */ |
870 | static void |
871 | batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv, |
872 | struct batadv_mcast_mla_flags *flags) |
873 | { |
874 | struct batadv_tvlv_mcast_data mcast_data; |
875 | |
876 | if (!memcmp(p: flags, q: &bat_priv->mcast.mla_flags, size: sizeof(*flags))) |
877 | return; |
878 | |
879 | batadv_mcast_bridge_log(bat_priv, new_flags: flags); |
880 | batadv_mcast_flags_log(bat_priv, flags: flags->tvlv_flags); |
881 | |
882 | mcast_data.flags = flags->tvlv_flags; |
883 | memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); |
884 | |
885 | batadv_tvlv_container_register(bat_priv, type: BATADV_TVLV_MCAST, version: 2, |
886 | tvlv_value: &mcast_data, tvlv_value_len: sizeof(mcast_data)); |
887 | |
888 | bat_priv->mcast.mla_flags = *flags; |
889 | } |
890 | |
891 | /** |
892 | * __batadv_mcast_mla_update() - update the own MLAs |
893 | * @bat_priv: the bat priv with all the soft interface information |
894 | * |
895 | * Updates the own multicast listener announcements in the translation |
896 | * table as well as the own, announced multicast tvlv container. |
897 | * |
898 | * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list |
899 | * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are |
900 | * ensured by the non-parallel execution of the worker this function |
901 | * belongs to. |
902 | */ |
903 | static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) |
904 | { |
905 | struct net_device *soft_iface = bat_priv->soft_iface; |
906 | struct hlist_head mcast_list = HLIST_HEAD_INIT; |
907 | struct batadv_mcast_mla_flags flags; |
908 | int ret; |
909 | |
910 | flags = batadv_mcast_mla_flags_get(bat_priv); |
911 | |
912 | ret = batadv_mcast_mla_softif_get(dev: soft_iface, mcast_list: &mcast_list, flags: &flags); |
913 | if (ret < 0) |
914 | goto out; |
915 | |
916 | ret = batadv_mcast_mla_bridge_get(dev: soft_iface, mcast_list: &mcast_list, flags: &flags); |
917 | if (ret < 0) |
918 | goto out; |
919 | |
920 | spin_lock(lock: &bat_priv->mcast.mla_lock); |
921 | batadv_mcast_mla_tt_retract(bat_priv, mcast_list: &mcast_list); |
922 | batadv_mcast_mla_tt_add(bat_priv, mcast_list: &mcast_list); |
923 | batadv_mcast_mla_flags_update(bat_priv, flags: &flags); |
924 | spin_unlock(lock: &bat_priv->mcast.mla_lock); |
925 | |
926 | out: |
927 | batadv_mcast_mla_list_free(mcast_list: &mcast_list); |
928 | } |
929 | |
930 | /** |
931 | * batadv_mcast_mla_update() - update the own MLAs |
932 | * @work: kernel work struct |
933 | * |
934 | * Updates the own multicast listener announcements in the translation |
935 | * table as well as the own, announced multicast tvlv container. |
936 | * |
937 | * In the end, reschedules the work timer. |
938 | */ |
939 | static void batadv_mcast_mla_update(struct work_struct *work) |
940 | { |
941 | struct delayed_work *delayed_work; |
942 | struct batadv_priv_mcast *priv_mcast; |
943 | struct batadv_priv *bat_priv; |
944 | |
945 | delayed_work = to_delayed_work(work); |
946 | priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); |
947 | bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); |
948 | |
949 | __batadv_mcast_mla_update(bat_priv); |
950 | batadv_mcast_start_timer(bat_priv); |
951 | } |
952 | |
953 | /** |
954 | * batadv_mcast_is_report_ipv4() - check for IGMP reports |
955 | * @skb: the ethernet frame destined for the mesh |
956 | * |
957 | * This call might reallocate skb data. |
958 | * |
959 | * Checks whether the given frame is a valid IGMP report. |
960 | * |
961 | * Return: If so then true, otherwise false. |
962 | */ |
963 | static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) |
964 | { |
965 | if (ip_mc_check_igmp(skb) < 0) |
966 | return false; |
967 | |
968 | switch (igmp_hdr(skb)->type) { |
969 | case IGMP_HOST_MEMBERSHIP_REPORT: |
970 | case IGMPV2_HOST_MEMBERSHIP_REPORT: |
971 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
972 | return true; |
973 | } |
974 | |
975 | return false; |
976 | } |
977 | |
978 | /** |
979 | * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding |
980 | * potential |
981 | * @bat_priv: the bat priv with all the soft interface information |
982 | * @skb: the IPv4 packet to check |
983 | * @is_unsnoopable: stores whether the destination is snoopable |
984 | * @is_routable: stores whether the destination is routable |
985 | * |
986 | * Checks whether the given IPv4 packet has the potential to be forwarded with a |
987 | * mode more optimal than classic flooding. |
988 | * |
989 | * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory |
990 | * allocation failure. |
991 | */ |
992 | static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, |
993 | struct sk_buff *skb, |
994 | bool *is_unsnoopable, |
995 | int *is_routable) |
996 | { |
997 | struct iphdr *iphdr; |
998 | |
999 | /* We might fail due to out-of-memory -> drop it */ |
1000 | if (!pskb_may_pull(skb, len: sizeof(struct ethhdr) + sizeof(*iphdr))) |
1001 | return -ENOMEM; |
1002 | |
1003 | if (batadv_mcast_is_report_ipv4(skb)) |
1004 | return -EINVAL; |
1005 | |
1006 | iphdr = ip_hdr(skb); |
1007 | |
1008 | /* link-local multicast listeners behind a bridge are |
1009 | * not snoopable (see RFC4541, section 2.1.2.2) |
1010 | */ |
1011 | if (ipv4_is_local_multicast(addr: iphdr->daddr)) |
1012 | *is_unsnoopable = true; |
1013 | else |
1014 | *is_routable = ETH_P_IP; |
1015 | |
1016 | return 0; |
1017 | } |
1018 | |
1019 | /** |
1020 | * batadv_mcast_is_report_ipv6() - check for MLD reports |
1021 | * @skb: the ethernet frame destined for the mesh |
1022 | * |
1023 | * This call might reallocate skb data. |
1024 | * |
1025 | * Checks whether the given frame is a valid MLD report. |
1026 | * |
1027 | * Return: If so then true, otherwise false. |
1028 | */ |
1029 | static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) |
1030 | { |
1031 | if (ipv6_mc_check_mld(skb) < 0) |
1032 | return false; |
1033 | |
1034 | switch (icmp6_hdr(skb)->icmp6_type) { |
1035 | case ICMPV6_MGM_REPORT: |
1036 | case ICMPV6_MLD2_REPORT: |
1037 | return true; |
1038 | } |
1039 | |
1040 | return false; |
1041 | } |
1042 | |
1043 | /** |
1044 | * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding |
1045 | * potential |
1046 | * @bat_priv: the bat priv with all the soft interface information |
1047 | * @skb: the IPv6 packet to check |
1048 | * @is_unsnoopable: stores whether the destination is snoopable |
1049 | * @is_routable: stores whether the destination is routable |
1050 | * |
1051 | * Checks whether the given IPv6 packet has the potential to be forwarded with a |
1052 | * mode more optimal than classic flooding. |
1053 | * |
1054 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1055 | */ |
1056 | static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, |
1057 | struct sk_buff *skb, |
1058 | bool *is_unsnoopable, |
1059 | int *is_routable) |
1060 | { |
1061 | struct ipv6hdr *ip6hdr; |
1062 | |
1063 | /* We might fail due to out-of-memory -> drop it */ |
1064 | if (!pskb_may_pull(skb, len: sizeof(struct ethhdr) + sizeof(*ip6hdr))) |
1065 | return -ENOMEM; |
1066 | |
1067 | if (batadv_mcast_is_report_ipv6(skb)) |
1068 | return -EINVAL; |
1069 | |
1070 | ip6hdr = ipv6_hdr(skb); |
1071 | |
1072 | if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
1073 | return -EINVAL; |
1074 | |
1075 | /* link-local-all-nodes multicast listeners behind a bridge are |
1076 | * not snoopable (see RFC4541, section 3, paragraph 3) |
1077 | */ |
1078 | if (ipv6_addr_is_ll_all_nodes(addr: &ip6hdr->daddr)) |
1079 | *is_unsnoopable = true; |
1080 | else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL) |
1081 | *is_routable = ETH_P_IPV6; |
1082 | |
1083 | return 0; |
1084 | } |
1085 | |
1086 | /** |
1087 | * batadv_mcast_forw_mode_check() - check for optimized forwarding potential |
1088 | * @bat_priv: the bat priv with all the soft interface information |
1089 | * @skb: the multicast frame to check |
1090 | * @is_unsnoopable: stores whether the destination is snoopable |
1091 | * @is_routable: stores whether the destination is routable |
1092 | * |
1093 | * Checks whether the given multicast ethernet frame has the potential to be |
1094 | * forwarded with a mode more optimal than classic flooding. |
1095 | * |
1096 | * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory |
1097 | */ |
1098 | static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, |
1099 | struct sk_buff *skb, |
1100 | bool *is_unsnoopable, |
1101 | int *is_routable) |
1102 | { |
1103 | struct ethhdr *ethhdr = eth_hdr(skb); |
1104 | |
1105 | if (!atomic_read(v: &bat_priv->multicast_mode)) |
1106 | return -EINVAL; |
1107 | |
1108 | switch (ntohs(ethhdr->h_proto)) { |
1109 | case ETH_P_IP: |
1110 | return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, |
1111 | is_unsnoopable, |
1112 | is_routable); |
1113 | case ETH_P_IPV6: |
1114 | if (!IS_ENABLED(CONFIG_IPV6)) |
1115 | return -EINVAL; |
1116 | |
1117 | return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, |
1118 | is_unsnoopable, |
1119 | is_routable); |
1120 | default: |
1121 | return -EINVAL; |
1122 | } |
1123 | } |
1124 | |
1125 | /** |
1126 | * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast |
1127 | * interest |
1128 | * @bat_priv: the bat priv with all the soft interface information |
1129 | * @ethhdr: ethernet header of a packet |
1130 | * |
1131 | * Return: the number of nodes which want all IPv4 multicast traffic if the |
1132 | * given ethhdr is from an IPv4 packet or the number of nodes which want all |
1133 | * IPv6 traffic if it matches an IPv6 packet. |
1134 | */ |
1135 | static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, |
1136 | struct ethhdr *ethhdr) |
1137 | { |
1138 | switch (ntohs(ethhdr->h_proto)) { |
1139 | case ETH_P_IP: |
1140 | return atomic_read(v: &bat_priv->mcast.num_want_all_ipv4); |
1141 | case ETH_P_IPV6: |
1142 | return atomic_read(v: &bat_priv->mcast.num_want_all_ipv6); |
1143 | default: |
1144 | /* we shouldn't be here... */ |
1145 | return 0; |
1146 | } |
1147 | } |
1148 | |
1149 | /** |
1150 | * batadv_mcast_forw_rtr_count() - count nodes with a multicast router |
1151 | * @bat_priv: the bat priv with all the soft interface information |
1152 | * @protocol: the ethernet protocol type to count multicast routers for |
1153 | * |
1154 | * Return: the number of nodes which want all routable IPv4 multicast traffic |
1155 | * if the protocol is ETH_P_IP or the number of nodes which want all routable |
1156 | * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0. |
1157 | */ |
1158 | |
1159 | static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv, |
1160 | int protocol) |
1161 | { |
1162 | switch (protocol) { |
1163 | case ETH_P_IP: |
1164 | return atomic_read(v: &bat_priv->mcast.num_want_all_rtr4); |
1165 | case ETH_P_IPV6: |
1166 | return atomic_read(v: &bat_priv->mcast.num_want_all_rtr6); |
1167 | default: |
1168 | return 0; |
1169 | } |
1170 | } |
1171 | |
1172 | /** |
1173 | * batadv_mcast_forw_mode_by_count() - get forwarding mode by count |
1174 | * @bat_priv: the bat priv with all the soft interface information |
1175 | * @skb: the multicast packet to check |
1176 | * @vid: the vlan identifier |
1177 | * @is_routable: stores whether the destination is routable |
1178 | * @count: the number of originators the multicast packet need to be sent to |
1179 | * |
1180 | * For a multicast packet with multiple destination originators, checks which |
1181 | * mode to use. For BATADV_FORW_MCAST it also encapsulates the packet with a |
1182 | * complete batman-adv multicast header. |
1183 | * |
1184 | * Return: |
1185 | * BATADV_FORW_MCAST: If all nodes have multicast packet routing |
1186 | * capabilities and an MTU >= 1280 on all hard interfaces (including us) |
1187 | * and the encapsulated multicast packet with all destination addresses |
1188 | * would still fit into an 1280 bytes batman-adv multicast packet |
1189 | * (excluding the outer ethernet frame) and we could successfully push |
1190 | * the full batman-adv multicast packet header. |
1191 | * BATADV_FORW_UCASTS: If the packet cannot be sent in a batman-adv |
1192 | * multicast packet and the amount of batman-adv unicast packets needed |
1193 | * is smaller or equal to the configured multicast fanout. |
1194 | * BATADV_FORW_BCAST: Otherwise. |
1195 | */ |
1196 | static enum batadv_forw_mode |
1197 | batadv_mcast_forw_mode_by_count(struct batadv_priv *bat_priv, |
1198 | struct sk_buff *skb, unsigned short vid, |
1199 | int is_routable, int count) |
1200 | { |
1201 | unsigned int mcast_hdrlen = batadv_mcast_forw_packet_hdrlen(num_dests: count); |
1202 | u8 own_tvlv_flags = bat_priv->mcast.mla_flags.tvlv_flags; |
1203 | |
1204 | if (!atomic_read(v: &bat_priv->mcast.num_no_mc_ptype_capa) && |
1205 | own_tvlv_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA && |
1206 | skb->len + mcast_hdrlen <= IPV6_MIN_MTU && |
1207 | batadv_mcast_forw_push(bat_priv, skb, vid, is_routable, count)) |
1208 | return BATADV_FORW_MCAST; |
1209 | |
1210 | if (count <= atomic_read(v: &bat_priv->multicast_fanout)) |
1211 | return BATADV_FORW_UCASTS; |
1212 | |
1213 | return BATADV_FORW_BCAST; |
1214 | } |
1215 | |
1216 | /** |
1217 | * batadv_mcast_forw_mode() - check on how to forward a multicast packet |
1218 | * @bat_priv: the bat priv with all the soft interface information |
1219 | * @skb: the multicast packet to check |
1220 | * @vid: the vlan identifier |
1221 | * @is_routable: stores whether the destination is routable |
1222 | * |
1223 | * Return: The forwarding mode as enum batadv_forw_mode. |
1224 | */ |
1225 | enum batadv_forw_mode |
1226 | batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1227 | unsigned short vid, int *is_routable) |
1228 | { |
1229 | int ret, tt_count, ip_count, unsnoop_count, total_count; |
1230 | bool is_unsnoopable = false; |
1231 | struct ethhdr *ethhdr; |
1232 | int rtr_count = 0; |
1233 | |
1234 | ret = batadv_mcast_forw_mode_check(bat_priv, skb, is_unsnoopable: &is_unsnoopable, |
1235 | is_routable); |
1236 | if (ret == -ENOMEM) |
1237 | return BATADV_FORW_NONE; |
1238 | else if (ret < 0) |
1239 | return BATADV_FORW_BCAST; |
1240 | |
1241 | ethhdr = eth_hdr(skb); |
1242 | |
1243 | tt_count = batadv_tt_global_hash_count(bat_priv, addr: ethhdr->h_dest, |
1244 | BATADV_NO_FLAGS); |
1245 | ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); |
1246 | unsnoop_count = !is_unsnoopable ? 0 : |
1247 | atomic_read(v: &bat_priv->mcast.num_want_all_unsnoopables); |
1248 | rtr_count = batadv_mcast_forw_rtr_count(bat_priv, protocol: *is_routable); |
1249 | |
1250 | total_count = tt_count + ip_count + unsnoop_count + rtr_count; |
1251 | |
1252 | if (!total_count) |
1253 | return BATADV_FORW_NONE; |
1254 | else if (unsnoop_count) |
1255 | return BATADV_FORW_BCAST; |
1256 | |
1257 | return batadv_mcast_forw_mode_by_count(bat_priv, skb, vid, is_routable: *is_routable, |
1258 | count: total_count); |
1259 | } |
1260 | |
1261 | /** |
1262 | * batadv_mcast_forw_send_orig() - send a multicast packet to an originator |
1263 | * @bat_priv: the bat priv with all the soft interface information |
1264 | * @skb: the multicast packet to send |
1265 | * @vid: the vlan identifier |
1266 | * @orig_node: the originator to send the packet to |
1267 | * |
1268 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
1269 | */ |
1270 | static int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv, |
1271 | struct sk_buff *skb, |
1272 | unsigned short vid, |
1273 | struct batadv_orig_node *orig_node) |
1274 | { |
1275 | /* Avoid sending multicast-in-unicast packets to other BLA |
1276 | * gateways - they already got the frame from the LAN side |
1277 | * we share with them. |
1278 | * TODO: Refactor to take BLA into account earlier, to avoid |
1279 | * reducing the mcast_fanout count. |
1280 | */ |
1281 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig: orig_node->orig, vid)) { |
1282 | dev_kfree_skb(skb); |
1283 | return NET_XMIT_SUCCESS; |
1284 | } |
1285 | |
1286 | return batadv_send_skb_unicast(bat_priv, skb, packet_type: BATADV_UNICAST, packet_subtype: 0, |
1287 | orig_node, vid); |
1288 | } |
1289 | |
1290 | /** |
1291 | * batadv_mcast_forw_tt() - forwards a packet to multicast listeners |
1292 | * @bat_priv: the bat priv with all the soft interface information |
1293 | * @skb: the multicast packet to transmit |
1294 | * @vid: the vlan identifier |
1295 | * |
1296 | * Sends copies of a frame with multicast destination to any multicast |
1297 | * listener registered in the translation table. A transmission is performed |
1298 | * via a batman-adv unicast packet for each such destination node. |
1299 | * |
1300 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS |
1301 | * otherwise. |
1302 | */ |
1303 | static int |
1304 | batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1305 | unsigned short vid) |
1306 | { |
1307 | int ret = NET_XMIT_SUCCESS; |
1308 | struct sk_buff *newskb; |
1309 | |
1310 | struct batadv_tt_orig_list_entry *orig_entry; |
1311 | |
1312 | struct batadv_tt_global_entry *tt_global; |
1313 | const u8 *addr = eth_hdr(skb)->h_dest; |
1314 | |
1315 | tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); |
1316 | if (!tt_global) |
1317 | goto out; |
1318 | |
1319 | rcu_read_lock(); |
1320 | hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) { |
1321 | newskb = skb_copy(skb, GFP_ATOMIC); |
1322 | if (!newskb) { |
1323 | ret = NET_XMIT_DROP; |
1324 | break; |
1325 | } |
1326 | |
1327 | batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, |
1328 | orig_node: orig_entry->orig_node); |
1329 | } |
1330 | rcu_read_unlock(); |
1331 | |
1332 | batadv_tt_global_entry_put(tt_global_entry: tt_global); |
1333 | |
1334 | out: |
1335 | return ret; |
1336 | } |
1337 | |
1338 | /** |
1339 | * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4 |
1340 | * @bat_priv: the bat priv with all the soft interface information |
1341 | * @skb: the multicast packet to transmit |
1342 | * @vid: the vlan identifier |
1343 | * |
1344 | * Sends copies of a frame with multicast destination to any node with a |
1345 | * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a |
1346 | * batman-adv unicast packet for each such destination node. |
1347 | * |
1348 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS |
1349 | * otherwise. |
1350 | */ |
1351 | static int |
1352 | batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv, |
1353 | struct sk_buff *skb, unsigned short vid) |
1354 | { |
1355 | struct batadv_orig_node *orig_node; |
1356 | int ret = NET_XMIT_SUCCESS; |
1357 | struct sk_buff *newskb; |
1358 | |
1359 | rcu_read_lock(); |
1360 | hlist_for_each_entry_rcu(orig_node, |
1361 | &bat_priv->mcast.want_all_ipv4_list, |
1362 | mcast_want_all_ipv4_node) { |
1363 | newskb = skb_copy(skb, GFP_ATOMIC); |
1364 | if (!newskb) { |
1365 | ret = NET_XMIT_DROP; |
1366 | break; |
1367 | } |
1368 | |
1369 | batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node); |
1370 | } |
1371 | rcu_read_unlock(); |
1372 | return ret; |
1373 | } |
1374 | |
1375 | /** |
1376 | * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6 |
1377 | * @bat_priv: the bat priv with all the soft interface information |
1378 | * @skb: The multicast packet to transmit |
1379 | * @vid: the vlan identifier |
1380 | * |
1381 | * Sends copies of a frame with multicast destination to any node with a |
1382 | * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a |
1383 | * batman-adv unicast packet for each such destination node. |
1384 | * |
1385 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS |
1386 | * otherwise. |
1387 | */ |
1388 | static int |
1389 | batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv, |
1390 | struct sk_buff *skb, unsigned short vid) |
1391 | { |
1392 | struct batadv_orig_node *orig_node; |
1393 | int ret = NET_XMIT_SUCCESS; |
1394 | struct sk_buff *newskb; |
1395 | |
1396 | rcu_read_lock(); |
1397 | hlist_for_each_entry_rcu(orig_node, |
1398 | &bat_priv->mcast.want_all_ipv6_list, |
1399 | mcast_want_all_ipv6_node) { |
1400 | newskb = skb_copy(skb, GFP_ATOMIC); |
1401 | if (!newskb) { |
1402 | ret = NET_XMIT_DROP; |
1403 | break; |
1404 | } |
1405 | |
1406 | batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node); |
1407 | } |
1408 | rcu_read_unlock(); |
1409 | return ret; |
1410 | } |
1411 | |
1412 | /** |
1413 | * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list |
1414 | * @bat_priv: the bat priv with all the soft interface information |
1415 | * @skb: the multicast packet to transmit |
1416 | * @vid: the vlan identifier |
1417 | * |
1418 | * Sends copies of a frame with multicast destination to any node with a |
1419 | * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A |
1420 | * transmission is performed via a batman-adv unicast packet for each such |
1421 | * destination node. |
1422 | * |
1423 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family |
1424 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. |
1425 | */ |
1426 | static int |
1427 | batadv_mcast_forw_want_all(struct batadv_priv *bat_priv, |
1428 | struct sk_buff *skb, unsigned short vid) |
1429 | { |
1430 | switch (ntohs(eth_hdr(skb)->h_proto)) { |
1431 | case ETH_P_IP: |
1432 | return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid); |
1433 | case ETH_P_IPV6: |
1434 | return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid); |
1435 | default: |
1436 | /* we shouldn't be here... */ |
1437 | return NET_XMIT_DROP; |
1438 | } |
1439 | } |
1440 | |
1441 | /** |
1442 | * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4 |
1443 | * @bat_priv: the bat priv with all the soft interface information |
1444 | * @skb: the multicast packet to transmit |
1445 | * @vid: the vlan identifier |
1446 | * |
1447 | * Sends copies of a frame with multicast destination to any node with a |
1448 | * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a |
1449 | * batman-adv unicast packet for each such destination node. |
1450 | * |
1451 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS |
1452 | * otherwise. |
1453 | */ |
1454 | static int |
1455 | batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv, |
1456 | struct sk_buff *skb, unsigned short vid) |
1457 | { |
1458 | struct batadv_orig_node *orig_node; |
1459 | int ret = NET_XMIT_SUCCESS; |
1460 | struct sk_buff *newskb; |
1461 | |
1462 | rcu_read_lock(); |
1463 | hlist_for_each_entry_rcu(orig_node, |
1464 | &bat_priv->mcast.want_all_rtr4_list, |
1465 | mcast_want_all_rtr4_node) { |
1466 | newskb = skb_copy(skb, GFP_ATOMIC); |
1467 | if (!newskb) { |
1468 | ret = NET_XMIT_DROP; |
1469 | break; |
1470 | } |
1471 | |
1472 | batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node); |
1473 | } |
1474 | rcu_read_unlock(); |
1475 | return ret; |
1476 | } |
1477 | |
1478 | /** |
1479 | * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6 |
1480 | * @bat_priv: the bat priv with all the soft interface information |
1481 | * @skb: The multicast packet to transmit |
1482 | * @vid: the vlan identifier |
1483 | * |
1484 | * Sends copies of a frame with multicast destination to any node with a |
1485 | * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a |
1486 | * batman-adv unicast packet for each such destination node. |
1487 | * |
1488 | * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS |
1489 | * otherwise. |
1490 | */ |
1491 | static int |
1492 | batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv, |
1493 | struct sk_buff *skb, unsigned short vid) |
1494 | { |
1495 | struct batadv_orig_node *orig_node; |
1496 | int ret = NET_XMIT_SUCCESS; |
1497 | struct sk_buff *newskb; |
1498 | |
1499 | rcu_read_lock(); |
1500 | hlist_for_each_entry_rcu(orig_node, |
1501 | &bat_priv->mcast.want_all_rtr6_list, |
1502 | mcast_want_all_rtr6_node) { |
1503 | newskb = skb_copy(skb, GFP_ATOMIC); |
1504 | if (!newskb) { |
1505 | ret = NET_XMIT_DROP; |
1506 | break; |
1507 | } |
1508 | |
1509 | batadv_mcast_forw_send_orig(bat_priv, skb: newskb, vid, orig_node); |
1510 | } |
1511 | rcu_read_unlock(); |
1512 | return ret; |
1513 | } |
1514 | |
1515 | /** |
1516 | * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list |
1517 | * @bat_priv: the bat priv with all the soft interface information |
1518 | * @skb: the multicast packet to transmit |
1519 | * @vid: the vlan identifier |
1520 | * |
1521 | * Sends copies of a frame with multicast destination to any node with a |
1522 | * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A |
1523 | * transmission is performed via a batman-adv unicast packet for each such |
1524 | * destination node. |
1525 | * |
1526 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family |
1527 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. |
1528 | */ |
1529 | static int |
1530 | batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv, |
1531 | struct sk_buff *skb, unsigned short vid) |
1532 | { |
1533 | switch (ntohs(eth_hdr(skb)->h_proto)) { |
1534 | case ETH_P_IP: |
1535 | return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid); |
1536 | case ETH_P_IPV6: |
1537 | return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid); |
1538 | default: |
1539 | /* we shouldn't be here... */ |
1540 | return NET_XMIT_DROP; |
1541 | } |
1542 | } |
1543 | |
1544 | /** |
1545 | * batadv_mcast_forw_send() - send packet to any detected multicast recipient |
1546 | * @bat_priv: the bat priv with all the soft interface information |
1547 | * @skb: the multicast packet to transmit |
1548 | * @vid: the vlan identifier |
1549 | * @is_routable: stores whether the destination is routable |
1550 | * |
1551 | * Sends copies of a frame with multicast destination to any node that signaled |
1552 | * interest in it, that is either via the translation table or the according |
1553 | * want-all flags. A transmission is performed via a batman-adv unicast packet |
1554 | * for each such destination node. |
1555 | * |
1556 | * The given skb is consumed/freed. |
1557 | * |
1558 | * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family |
1559 | * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. |
1560 | */ |
1561 | int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1562 | unsigned short vid, int is_routable) |
1563 | { |
1564 | int ret; |
1565 | |
1566 | ret = batadv_mcast_forw_tt(bat_priv, skb, vid); |
1567 | if (ret != NET_XMIT_SUCCESS) { |
1568 | kfree_skb(skb); |
1569 | return ret; |
1570 | } |
1571 | |
1572 | ret = batadv_mcast_forw_want_all(bat_priv, skb, vid); |
1573 | if (ret != NET_XMIT_SUCCESS) { |
1574 | kfree_skb(skb); |
1575 | return ret; |
1576 | } |
1577 | |
1578 | if (!is_routable) |
1579 | goto skip_mc_router; |
1580 | |
1581 | ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid); |
1582 | if (ret != NET_XMIT_SUCCESS) { |
1583 | kfree_skb(skb); |
1584 | return ret; |
1585 | } |
1586 | |
1587 | skip_mc_router: |
1588 | consume_skb(skb); |
1589 | return ret; |
1590 | } |
1591 | |
1592 | /** |
1593 | * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list |
1594 | * @bat_priv: the bat priv with all the soft interface information |
1595 | * @orig: the orig_node which multicast state might have changed of |
1596 | * @mcast_flags: flags indicating the new multicast state |
1597 | * |
1598 | * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, |
1599 | * orig, has toggled then this method updates the counter and the list |
1600 | * accordingly. |
1601 | * |
1602 | * Caller needs to hold orig->mcast_handler_lock. |
1603 | */ |
1604 | static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, |
1605 | struct batadv_orig_node *orig, |
1606 | u8 mcast_flags) |
1607 | { |
1608 | struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; |
1609 | struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; |
1610 | |
1611 | lockdep_assert_held(&orig->mcast_handler_lock); |
1612 | |
1613 | /* switched from flag unset to set */ |
1614 | if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && |
1615 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { |
1616 | atomic_inc(v: &bat_priv->mcast.num_want_all_unsnoopables); |
1617 | |
1618 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1619 | /* flag checks above + mcast_handler_lock prevents this */ |
1620 | WARN_ON(!hlist_unhashed(node)); |
1621 | |
1622 | hlist_add_head_rcu(n: node, h: head); |
1623 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1624 | /* switched from flag set to unset */ |
1625 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && |
1626 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { |
1627 | atomic_dec(v: &bat_priv->mcast.num_want_all_unsnoopables); |
1628 | |
1629 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1630 | /* flag checks above + mcast_handler_lock prevents this */ |
1631 | WARN_ON(hlist_unhashed(node)); |
1632 | |
1633 | hlist_del_init_rcu(n: node); |
1634 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1635 | } |
1636 | } |
1637 | |
1638 | /** |
1639 | * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list |
1640 | * @bat_priv: the bat priv with all the soft interface information |
1641 | * @orig: the orig_node which multicast state might have changed of |
1642 | * @mcast_flags: flags indicating the new multicast state |
1643 | * |
1644 | * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has |
1645 | * toggled then this method updates the counter and the list accordingly. |
1646 | * |
1647 | * Caller needs to hold orig->mcast_handler_lock. |
1648 | */ |
1649 | static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, |
1650 | struct batadv_orig_node *orig, |
1651 | u8 mcast_flags) |
1652 | { |
1653 | struct hlist_node *node = &orig->mcast_want_all_ipv4_node; |
1654 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; |
1655 | |
1656 | lockdep_assert_held(&orig->mcast_handler_lock); |
1657 | |
1658 | /* switched from flag unset to set */ |
1659 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && |
1660 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { |
1661 | atomic_inc(v: &bat_priv->mcast.num_want_all_ipv4); |
1662 | |
1663 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1664 | /* flag checks above + mcast_handler_lock prevents this */ |
1665 | WARN_ON(!hlist_unhashed(node)); |
1666 | |
1667 | hlist_add_head_rcu(n: node, h: head); |
1668 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1669 | /* switched from flag set to unset */ |
1670 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && |
1671 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { |
1672 | atomic_dec(v: &bat_priv->mcast.num_want_all_ipv4); |
1673 | |
1674 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1675 | /* flag checks above + mcast_handler_lock prevents this */ |
1676 | WARN_ON(hlist_unhashed(node)); |
1677 | |
1678 | hlist_del_init_rcu(n: node); |
1679 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1680 | } |
1681 | } |
1682 | |
1683 | /** |
1684 | * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list |
1685 | * @bat_priv: the bat priv with all the soft interface information |
1686 | * @orig: the orig_node which multicast state might have changed of |
1687 | * @mcast_flags: flags indicating the new multicast state |
1688 | * |
1689 | * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has |
1690 | * toggled then this method updates the counter and the list accordingly. |
1691 | * |
1692 | * Caller needs to hold orig->mcast_handler_lock. |
1693 | */ |
1694 | static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, |
1695 | struct batadv_orig_node *orig, |
1696 | u8 mcast_flags) |
1697 | { |
1698 | struct hlist_node *node = &orig->mcast_want_all_ipv6_node; |
1699 | struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; |
1700 | |
1701 | lockdep_assert_held(&orig->mcast_handler_lock); |
1702 | |
1703 | /* switched from flag unset to set */ |
1704 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && |
1705 | !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { |
1706 | atomic_inc(v: &bat_priv->mcast.num_want_all_ipv6); |
1707 | |
1708 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1709 | /* flag checks above + mcast_handler_lock prevents this */ |
1710 | WARN_ON(!hlist_unhashed(node)); |
1711 | |
1712 | hlist_add_head_rcu(n: node, h: head); |
1713 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1714 | /* switched from flag set to unset */ |
1715 | } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && |
1716 | orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { |
1717 | atomic_dec(v: &bat_priv->mcast.num_want_all_ipv6); |
1718 | |
1719 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1720 | /* flag checks above + mcast_handler_lock prevents this */ |
1721 | WARN_ON(hlist_unhashed(node)); |
1722 | |
1723 | hlist_del_init_rcu(n: node); |
1724 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1725 | } |
1726 | } |
1727 | |
1728 | /** |
1729 | * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list |
1730 | * @bat_priv: the bat priv with all the soft interface information |
1731 | * @orig: the orig_node which multicast state might have changed of |
1732 | * @mcast_flags: flags indicating the new multicast state |
1733 | * |
1734 | * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has |
1735 | * toggled then this method updates the counter and the list accordingly. |
1736 | * |
1737 | * Caller needs to hold orig->mcast_handler_lock. |
1738 | */ |
1739 | static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv, |
1740 | struct batadv_orig_node *orig, |
1741 | u8 mcast_flags) |
1742 | { |
1743 | struct hlist_node *node = &orig->mcast_want_all_rtr4_node; |
1744 | struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list; |
1745 | |
1746 | lockdep_assert_held(&orig->mcast_handler_lock); |
1747 | |
1748 | /* switched from flag set to unset */ |
1749 | if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) && |
1750 | orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) { |
1751 | atomic_inc(v: &bat_priv->mcast.num_want_all_rtr4); |
1752 | |
1753 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1754 | /* flag checks above + mcast_handler_lock prevents this */ |
1755 | WARN_ON(!hlist_unhashed(node)); |
1756 | |
1757 | hlist_add_head_rcu(n: node, h: head); |
1758 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1759 | /* switched from flag unset to set */ |
1760 | } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 && |
1761 | !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) { |
1762 | atomic_dec(v: &bat_priv->mcast.num_want_all_rtr4); |
1763 | |
1764 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1765 | /* flag checks above + mcast_handler_lock prevents this */ |
1766 | WARN_ON(hlist_unhashed(node)); |
1767 | |
1768 | hlist_del_init_rcu(n: node); |
1769 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1770 | } |
1771 | } |
1772 | |
1773 | /** |
1774 | * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list |
1775 | * @bat_priv: the bat priv with all the soft interface information |
1776 | * @orig: the orig_node which multicast state might have changed of |
1777 | * @mcast_flags: flags indicating the new multicast state |
1778 | * |
1779 | * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has |
1780 | * toggled then this method updates the counter and the list accordingly. |
1781 | * |
1782 | * Caller needs to hold orig->mcast_handler_lock. |
1783 | */ |
1784 | static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv, |
1785 | struct batadv_orig_node *orig, |
1786 | u8 mcast_flags) |
1787 | { |
1788 | struct hlist_node *node = &orig->mcast_want_all_rtr6_node; |
1789 | struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list; |
1790 | |
1791 | lockdep_assert_held(&orig->mcast_handler_lock); |
1792 | |
1793 | /* switched from flag set to unset */ |
1794 | if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) && |
1795 | orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) { |
1796 | atomic_inc(v: &bat_priv->mcast.num_want_all_rtr6); |
1797 | |
1798 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1799 | /* flag checks above + mcast_handler_lock prevents this */ |
1800 | WARN_ON(!hlist_unhashed(node)); |
1801 | |
1802 | hlist_add_head_rcu(n: node, h: head); |
1803 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1804 | /* switched from flag unset to set */ |
1805 | } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 && |
1806 | !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) { |
1807 | atomic_dec(v: &bat_priv->mcast.num_want_all_rtr6); |
1808 | |
1809 | spin_lock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1810 | /* flag checks above + mcast_handler_lock prevents this */ |
1811 | WARN_ON(hlist_unhashed(node)); |
1812 | |
1813 | hlist_del_init_rcu(n: node); |
1814 | spin_unlock_bh(lock: &bat_priv->mcast.want_lists_lock); |
1815 | } |
1816 | } |
1817 | |
1818 | /** |
1819 | * batadv_mcast_have_mc_ptype_update() - update multicast packet type counter |
1820 | * @bat_priv: the bat priv with all the soft interface information |
1821 | * @orig: the orig_node which multicast state might have changed of |
1822 | * @mcast_flags: flags indicating the new multicast state |
1823 | * |
1824 | * If the BATADV_MCAST_HAVE_MC_PTYPE_CAPA flag of this originator, orig, has |
1825 | * toggled then this method updates the counter accordingly. |
1826 | */ |
1827 | static void batadv_mcast_have_mc_ptype_update(struct batadv_priv *bat_priv, |
1828 | struct batadv_orig_node *orig, |
1829 | u8 mcast_flags) |
1830 | { |
1831 | lockdep_assert_held(&orig->mcast_handler_lock); |
1832 | |
1833 | /* switched from flag set to unset */ |
1834 | if (!(mcast_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) && |
1835 | orig->mcast_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) |
1836 | atomic_inc(v: &bat_priv->mcast.num_no_mc_ptype_capa); |
1837 | /* switched from flag unset to set */ |
1838 | else if (mcast_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA && |
1839 | !(orig->mcast_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA)) |
1840 | atomic_dec(v: &bat_priv->mcast.num_no_mc_ptype_capa); |
1841 | } |
1842 | |
1843 | /** |
1844 | * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV |
1845 | * @enabled: whether the originator has multicast TVLV support enabled |
1846 | * @tvlv_value: tvlv buffer containing the multicast flags |
1847 | * @tvlv_value_len: tvlv buffer length |
1848 | * |
1849 | * Return: multicast flags for the given tvlv buffer |
1850 | */ |
1851 | static u8 |
1852 | batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len) |
1853 | { |
1854 | u8 mcast_flags = BATADV_NO_FLAGS; |
1855 | |
1856 | if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags)) |
1857 | mcast_flags = *(u8 *)tvlv_value; |
1858 | |
1859 | if (!enabled) { |
1860 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4; |
1861 | mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6; |
1862 | } |
1863 | |
1864 | /* remove redundant flags to avoid sending duplicate packets later */ |
1865 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) |
1866 | mcast_flags |= BATADV_MCAST_WANT_NO_RTR4; |
1867 | |
1868 | if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) |
1869 | mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; |
1870 | |
1871 | return mcast_flags; |
1872 | } |
1873 | |
1874 | /** |
1875 | * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container |
1876 | * @bat_priv: the bat priv with all the soft interface information |
1877 | * @orig: the orig_node of the ogm |
1878 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) |
1879 | * @tvlv_value: tvlv buffer containing the multicast data |
1880 | * @tvlv_value_len: tvlv buffer length |
1881 | */ |
1882 | static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, |
1883 | struct batadv_orig_node *orig, |
1884 | u8 flags, |
1885 | void *tvlv_value, |
1886 | u16 tvlv_value_len) |
1887 | { |
1888 | bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
1889 | u8 mcast_flags; |
1890 | |
1891 | mcast_flags = batadv_mcast_tvlv_flags_get(enabled: orig_mcast_enabled, |
1892 | tvlv_value, tvlv_value_len); |
1893 | |
1894 | spin_lock_bh(lock: &orig->mcast_handler_lock); |
1895 | |
1896 | if (orig_mcast_enabled && |
1897 | !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
1898 | set_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capabilities); |
1899 | } else if (!orig_mcast_enabled && |
1900 | test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { |
1901 | clear_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capabilities); |
1902 | } |
1903 | |
1904 | set_bit(nr: BATADV_ORIG_CAPA_HAS_MCAST, addr: &orig->capa_initialized); |
1905 | |
1906 | batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); |
1907 | batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); |
1908 | batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); |
1909 | batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags); |
1910 | batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags); |
1911 | batadv_mcast_have_mc_ptype_update(bat_priv, orig, mcast_flags); |
1912 | |
1913 | orig->mcast_flags = mcast_flags; |
1914 | spin_unlock_bh(lock: &orig->mcast_handler_lock); |
1915 | } |
1916 | |
1917 | /** |
1918 | * batadv_mcast_init() - initialize the multicast optimizations structures |
1919 | * @bat_priv: the bat priv with all the soft interface information |
1920 | */ |
1921 | void batadv_mcast_init(struct batadv_priv *bat_priv) |
1922 | { |
1923 | batadv_tvlv_handler_register(bat_priv, optr: batadv_mcast_tvlv_ogm_handler, |
1924 | NULL, NULL, type: BATADV_TVLV_MCAST, version: 2, |
1925 | flags: BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
1926 | batadv_tvlv_handler_register(bat_priv, NULL, NULL, |
1927 | mptr: batadv_mcast_forw_tracker_tvlv_handler, |
1928 | type: BATADV_TVLV_MCAST_TRACKER, version: 1, |
1929 | flags: BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
1930 | |
1931 | INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); |
1932 | batadv_mcast_start_timer(bat_priv); |
1933 | } |
1934 | |
1935 | /** |
1936 | * batadv_mcast_mesh_info_put() - put multicast info into a netlink message |
1937 | * @msg: buffer for the message |
1938 | * @bat_priv: the bat priv with all the soft interface information |
1939 | * |
1940 | * Return: 0 or error code. |
1941 | */ |
1942 | int batadv_mcast_mesh_info_put(struct sk_buff *msg, |
1943 | struct batadv_priv *bat_priv) |
1944 | { |
1945 | u32 flags = bat_priv->mcast.mla_flags.tvlv_flags; |
1946 | u32 flags_priv = BATADV_NO_FLAGS; |
1947 | |
1948 | if (bat_priv->mcast.mla_flags.bridged) { |
1949 | flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; |
1950 | |
1951 | if (bat_priv->mcast.mla_flags.querier_ipv4.exists) |
1952 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; |
1953 | if (bat_priv->mcast.mla_flags.querier_ipv6.exists) |
1954 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; |
1955 | if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing) |
1956 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; |
1957 | if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing) |
1958 | flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; |
1959 | } |
1960 | |
1961 | if (nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS, value: flags) || |
1962 | nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS_PRIV, value: flags_priv)) |
1963 | return -EMSGSIZE; |
1964 | |
1965 | return 0; |
1966 | } |
1967 | |
1968 | /** |
1969 | * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table |
1970 | * to a netlink socket |
1971 | * @msg: buffer for the message |
1972 | * @portid: netlink port |
1973 | * @cb: Control block containing additional options |
1974 | * @orig_node: originator to dump the multicast flags of |
1975 | * |
1976 | * Return: 0 or error code. |
1977 | */ |
1978 | static int |
1979 | batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, |
1980 | struct netlink_callback *cb, |
1981 | struct batadv_orig_node *orig_node) |
1982 | { |
1983 | void *hdr; |
1984 | |
1985 | hdr = genlmsg_put(skb: msg, portid, seq: cb->nlh->nlmsg_seq, |
1986 | family: &batadv_netlink_family, NLM_F_MULTI, |
1987 | cmd: BATADV_CMD_GET_MCAST_FLAGS); |
1988 | if (!hdr) |
1989 | return -ENOBUFS; |
1990 | |
1991 | genl_dump_check_consistent(cb, user_hdr: hdr); |
1992 | |
1993 | if (nla_put(skb: msg, attrtype: BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, |
1994 | data: orig_node->orig)) { |
1995 | genlmsg_cancel(skb: msg, hdr); |
1996 | return -EMSGSIZE; |
1997 | } |
1998 | |
1999 | if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
2000 | &orig_node->capabilities)) { |
2001 | if (nla_put_u32(skb: msg, attrtype: BATADV_ATTR_MCAST_FLAGS, |
2002 | value: orig_node->mcast_flags)) { |
2003 | genlmsg_cancel(skb: msg, hdr); |
2004 | return -EMSGSIZE; |
2005 | } |
2006 | } |
2007 | |
2008 | genlmsg_end(skb: msg, hdr); |
2009 | return 0; |
2010 | } |
2011 | |
2012 | /** |
2013 | * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags |
2014 | * table to a netlink socket |
2015 | * @msg: buffer for the message |
2016 | * @portid: netlink port |
2017 | * @cb: Control block containing additional options |
2018 | * @hash: hash to dump |
2019 | * @bucket: bucket index to dump |
2020 | * @idx_skip: How many entries to skip |
2021 | * |
2022 | * Return: 0 or error code. |
2023 | */ |
2024 | static int |
2025 | batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, |
2026 | struct netlink_callback *cb, |
2027 | struct batadv_hashtable *hash, |
2028 | unsigned int bucket, long *idx_skip) |
2029 | { |
2030 | struct batadv_orig_node *orig_node; |
2031 | long idx = 0; |
2032 | |
2033 | spin_lock_bh(lock: &hash->list_locks[bucket]); |
2034 | cb->seq = atomic_read(v: &hash->generation) << 1 | 1; |
2035 | |
2036 | hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) { |
2037 | if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, |
2038 | &orig_node->capa_initialized)) |
2039 | continue; |
2040 | |
2041 | if (idx < *idx_skip) |
2042 | goto skip; |
2043 | |
2044 | if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) { |
2045 | spin_unlock_bh(lock: &hash->list_locks[bucket]); |
2046 | *idx_skip = idx; |
2047 | |
2048 | return -EMSGSIZE; |
2049 | } |
2050 | |
2051 | skip: |
2052 | idx++; |
2053 | } |
2054 | spin_unlock_bh(lock: &hash->list_locks[bucket]); |
2055 | |
2056 | return 0; |
2057 | } |
2058 | |
2059 | /** |
2060 | * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket |
2061 | * @msg: buffer for the message |
2062 | * @portid: netlink port |
2063 | * @cb: Control block containing additional options |
2064 | * @bat_priv: the bat priv with all the soft interface information |
2065 | * @bucket: current bucket to dump |
2066 | * @idx: index in current bucket to the next entry to dump |
2067 | * |
2068 | * Return: 0 or error code. |
2069 | */ |
2070 | static int |
2071 | __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, |
2072 | struct netlink_callback *cb, |
2073 | struct batadv_priv *bat_priv, long *bucket, long *idx) |
2074 | { |
2075 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
2076 | long bucket_tmp = *bucket; |
2077 | long idx_tmp = *idx; |
2078 | |
2079 | while (bucket_tmp < hash->size) { |
2080 | if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash, |
2081 | bucket: bucket_tmp, idx_skip: &idx_tmp)) |
2082 | break; |
2083 | |
2084 | bucket_tmp++; |
2085 | idx_tmp = 0; |
2086 | } |
2087 | |
2088 | *bucket = bucket_tmp; |
2089 | *idx = idx_tmp; |
2090 | |
2091 | return msg->len; |
2092 | } |
2093 | |
2094 | /** |
2095 | * batadv_mcast_netlink_get_primary() - get primary interface from netlink |
2096 | * callback |
2097 | * @cb: netlink callback structure |
2098 | * @primary_if: the primary interface pointer to return the result in |
2099 | * |
2100 | * Return: 0 or error code. |
2101 | */ |
2102 | static int |
2103 | batadv_mcast_netlink_get_primary(struct netlink_callback *cb, |
2104 | struct batadv_hard_iface **primary_if) |
2105 | { |
2106 | struct batadv_hard_iface *hard_iface = NULL; |
2107 | struct net *net = sock_net(sk: cb->skb->sk); |
2108 | struct net_device *soft_iface; |
2109 | struct batadv_priv *bat_priv; |
2110 | int ifindex; |
2111 | int ret = 0; |
2112 | |
2113 | ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, attrtype: BATADV_ATTR_MESH_IFINDEX); |
2114 | if (!ifindex) |
2115 | return -EINVAL; |
2116 | |
2117 | soft_iface = dev_get_by_index(net, ifindex); |
2118 | if (!soft_iface || !batadv_softif_is_valid(net_dev: soft_iface)) { |
2119 | ret = -ENODEV; |
2120 | goto out; |
2121 | } |
2122 | |
2123 | bat_priv = netdev_priv(dev: soft_iface); |
2124 | |
2125 | hard_iface = batadv_primary_if_get_selected(bat_priv); |
2126 | if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { |
2127 | ret = -ENOENT; |
2128 | goto out; |
2129 | } |
2130 | |
2131 | out: |
2132 | dev_put(dev: soft_iface); |
2133 | |
2134 | if (!ret && primary_if) |
2135 | *primary_if = hard_iface; |
2136 | else |
2137 | batadv_hardif_put(hard_iface); |
2138 | |
2139 | return ret; |
2140 | } |
2141 | |
2142 | /** |
2143 | * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket |
2144 | * @msg: buffer for the message |
2145 | * @cb: callback structure containing arguments |
2146 | * |
2147 | * Return: message length. |
2148 | */ |
2149 | int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) |
2150 | { |
2151 | struct batadv_hard_iface *primary_if = NULL; |
2152 | int portid = NETLINK_CB(cb->skb).portid; |
2153 | struct batadv_priv *bat_priv; |
2154 | long *bucket = &cb->args[0]; |
2155 | long *idx = &cb->args[1]; |
2156 | int ret; |
2157 | |
2158 | ret = batadv_mcast_netlink_get_primary(cb, primary_if: &primary_if); |
2159 | if (ret) |
2160 | return ret; |
2161 | |
2162 | bat_priv = netdev_priv(dev: primary_if->soft_iface); |
2163 | ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx); |
2164 | |
2165 | batadv_hardif_put(hard_iface: primary_if); |
2166 | return ret; |
2167 | } |
2168 | |
2169 | /** |
2170 | * batadv_mcast_free() - free the multicast optimizations structures |
2171 | * @bat_priv: the bat priv with all the soft interface information |
2172 | */ |
2173 | void batadv_mcast_free(struct batadv_priv *bat_priv) |
2174 | { |
2175 | cancel_delayed_work_sync(dwork: &bat_priv->mcast.work); |
2176 | |
2177 | batadv_tvlv_container_unregister(bat_priv, type: BATADV_TVLV_MCAST, version: 2); |
2178 | batadv_tvlv_handler_unregister(bat_priv, type: BATADV_TVLV_MCAST_TRACKER, version: 1); |
2179 | batadv_tvlv_handler_unregister(bat_priv, type: BATADV_TVLV_MCAST, version: 2); |
2180 | |
2181 | /* safely calling outside of worker, as worker was canceled above */ |
2182 | batadv_mcast_mla_tt_retract(bat_priv, NULL); |
2183 | } |
2184 | |
2185 | /** |
2186 | * batadv_mcast_purge_orig() - reset originator global mcast state modifications |
2187 | * @orig: the originator which is going to get purged |
2188 | */ |
2189 | void batadv_mcast_purge_orig(struct batadv_orig_node *orig) |
2190 | { |
2191 | struct batadv_priv *bat_priv = orig->bat_priv; |
2192 | |
2193 | spin_lock_bh(lock: &orig->mcast_handler_lock); |
2194 | |
2195 | batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); |
2196 | batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); |
2197 | batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); |
2198 | batadv_mcast_want_rtr4_update(bat_priv, orig, |
2199 | mcast_flags: BATADV_MCAST_WANT_NO_RTR4); |
2200 | batadv_mcast_want_rtr6_update(bat_priv, orig, |
2201 | mcast_flags: BATADV_MCAST_WANT_NO_RTR6); |
2202 | batadv_mcast_have_mc_ptype_update(bat_priv, orig, |
2203 | mcast_flags: BATADV_MCAST_HAVE_MC_PTYPE_CAPA); |
2204 | |
2205 | spin_unlock_bh(lock: &orig->mcast_handler_lock); |
2206 | } |
2207 | |