]>
Commit | Line | Data |
---|---|---|
eb2b9311 | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
eb2b9311 LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/etherdevice.h> | |
11 | #include <linux/list.h> | |
eb2b9311 | 12 | #include <linux/random.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
eb2b9311 LCC |
14 | #include <linux/spinlock.h> |
15 | #include <linux/string.h> | |
16 | #include <net/mac80211.h> | |
4777be41 | 17 | #include "wme.h" |
eb2b9311 LCC |
18 | #include "ieee80211_i.h" |
19 | #include "mesh.h" | |
20 | ||
21 | /* There will be initially 2^INIT_PATHS_SIZE_ORDER buckets */ | |
22 | #define INIT_PATHS_SIZE_ORDER 2 | |
23 | ||
24 | /* Keep the mean chain length below this constant */ | |
25 | #define MEAN_CHAIN_LEN 2 | |
26 | ||
bf7cd94d JB |
27 | static inline bool mpath_expired(struct mesh_path *mpath) |
28 | { | |
29 | return (mpath->flags & MESH_PATH_ACTIVE) && | |
30 | time_after(jiffies, mpath->exp_time) && | |
31 | !(mpath->flags & MESH_PATH_FIXED); | |
32 | } | |
eb2b9311 LCC |
33 | |
34 | struct mpath_node { | |
35 | struct hlist_node list; | |
36 | struct rcu_head rcu; | |
37 | /* This indirection allows two different tables to point to the same | |
38 | * mesh_path structure, useful when resizing | |
39 | */ | |
40 | struct mesh_path *mpath; | |
41 | }; | |
42 | ||
349eb8cf JB |
43 | static struct mesh_table __rcu *mesh_paths; |
44 | static struct mesh_table __rcu *mpp_paths; /* Store paths for MPP&MAP */ | |
eb2b9311 | 45 | |
f5ea9120 | 46 | int mesh_paths_generation; |
a2db2ed3 | 47 | int mpp_paths_generation; |
6b86bd62 JB |
48 | |
49 | /* This lock will have the grow table function as writer and add / delete nodes | |
239289e4 JC |
50 | * as readers. RCU provides sufficient protection only when reading the table |
51 | * (i.e. doing lookups). Adding or adding or removing nodes requires we take | |
52 | * the read lock or we risk operating on an old table. The write lock is only | |
53 | * needed when modifying the number of buckets a table. | |
6b86bd62 JB |
54 | */ |
55 | static DEFINE_RWLOCK(pathtbl_resize_lock); | |
56 | ||
57 | ||
349eb8cf JB |
58 | static inline struct mesh_table *resize_dereference_mesh_paths(void) |
59 | { | |
60 | return rcu_dereference_protected(mesh_paths, | |
61 | lockdep_is_held(&pathtbl_resize_lock)); | |
62 | } | |
63 | ||
64 | static inline struct mesh_table *resize_dereference_mpp_paths(void) | |
65 | { | |
66 | return rcu_dereference_protected(mpp_paths, | |
67 | lockdep_is_held(&pathtbl_resize_lock)); | |
68 | } | |
69 | ||
70 | /* | |
71 | * CAREFUL -- "tbl" must not be an expression, | |
72 | * in particular not an rcu_dereference(), since | |
73 | * it's used twice. So it is illegal to do | |
74 | * for_each_mesh_entry(rcu_dereference(...), ...) | |
75 | */ | |
b67bfe0d | 76 | #define for_each_mesh_entry(tbl, node, i) \ |
349eb8cf | 77 | for (i = 0; i <= tbl->hash_mask; i++) \ |
b67bfe0d | 78 | hlist_for_each_entry_rcu(node, &tbl->hash_buckets[i], list) |
349eb8cf JB |
79 | |
80 | ||
6b86bd62 JB |
81 | static struct mesh_table *mesh_table_alloc(int size_order) |
82 | { | |
83 | int i; | |
84 | struct mesh_table *newtbl; | |
85 | ||
d676ff49 | 86 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); |
6b86bd62 JB |
87 | if (!newtbl) |
88 | return NULL; | |
89 | ||
90 | newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * | |
d676ff49 | 91 | (1 << size_order), GFP_ATOMIC); |
6b86bd62 JB |
92 | |
93 | if (!newtbl->hash_buckets) { | |
94 | kfree(newtbl); | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * | |
d676ff49 | 99 | (1 << size_order), GFP_ATOMIC); |
6b86bd62 JB |
100 | if (!newtbl->hashwlock) { |
101 | kfree(newtbl->hash_buckets); | |
102 | kfree(newtbl); | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | newtbl->size_order = size_order; | |
107 | newtbl->hash_mask = (1 << size_order) - 1; | |
108 | atomic_set(&newtbl->entries, 0); | |
109 | get_random_bytes(&newtbl->hash_rnd, | |
110 | sizeof(newtbl->hash_rnd)); | |
111 | for (i = 0; i <= newtbl->hash_mask; i++) | |
112 | spin_lock_init(&newtbl->hashwlock[i]); | |
5ee68e5b | 113 | spin_lock_init(&newtbl->gates_lock); |
6b86bd62 JB |
114 | |
115 | return newtbl; | |
116 | } | |
117 | ||
18889231 JC |
118 | static void __mesh_table_free(struct mesh_table *tbl) |
119 | { | |
120 | kfree(tbl->hash_buckets); | |
121 | kfree(tbl->hashwlock); | |
122 | kfree(tbl); | |
123 | } | |
124 | ||
6b86bd62 | 125 | static void mesh_table_free(struct mesh_table *tbl, bool free_leafs) |
18889231 JC |
126 | { |
127 | struct hlist_head *mesh_hash; | |
128 | struct hlist_node *p, *q; | |
5ee68e5b | 129 | struct mpath_node *gate; |
18889231 JC |
130 | int i; |
131 | ||
132 | mesh_hash = tbl->hash_buckets; | |
133 | for (i = 0; i <= tbl->hash_mask; i++) { | |
9b84b808 | 134 | spin_lock_bh(&tbl->hashwlock[i]); |
18889231 JC |
135 | hlist_for_each_safe(p, q, &mesh_hash[i]) { |
136 | tbl->free_node(p, free_leafs); | |
137 | atomic_dec(&tbl->entries); | |
138 | } | |
9b84b808 | 139 | spin_unlock_bh(&tbl->hashwlock[i]); |
18889231 | 140 | } |
5ee68e5b JC |
141 | if (free_leafs) { |
142 | spin_lock_bh(&tbl->gates_lock); | |
b67bfe0d | 143 | hlist_for_each_entry_safe(gate, q, |
5ee68e5b JC |
144 | tbl->known_gates, list) { |
145 | hlist_del(&gate->list); | |
146 | kfree(gate); | |
147 | } | |
148 | kfree(tbl->known_gates); | |
149 | spin_unlock_bh(&tbl->gates_lock); | |
150 | } | |
151 | ||
18889231 JC |
152 | __mesh_table_free(tbl); |
153 | } | |
154 | ||
a3e6b12c | 155 | static int mesh_table_grow(struct mesh_table *oldtbl, |
6b86bd62 | 156 | struct mesh_table *newtbl) |
18889231 | 157 | { |
18889231 JC |
158 | struct hlist_head *oldhash; |
159 | struct hlist_node *p, *q; | |
160 | int i; | |
161 | ||
a3e6b12c | 162 | if (atomic_read(&oldtbl->entries) |
3f73fe9f | 163 | < MEAN_CHAIN_LEN * (oldtbl->hash_mask + 1)) |
a3e6b12c | 164 | return -EAGAIN; |
18889231 | 165 | |
a3e6b12c | 166 | newtbl->free_node = oldtbl->free_node; |
a3e6b12c | 167 | newtbl->copy_node = oldtbl->copy_node; |
5ee68e5b | 168 | newtbl->known_gates = oldtbl->known_gates; |
a3e6b12c | 169 | atomic_set(&newtbl->entries, atomic_read(&oldtbl->entries)); |
18889231 | 170 | |
a3e6b12c I |
171 | oldhash = oldtbl->hash_buckets; |
172 | for (i = 0; i <= oldtbl->hash_mask; i++) | |
18889231 | 173 | hlist_for_each(p, &oldhash[i]) |
a3e6b12c | 174 | if (oldtbl->copy_node(p, newtbl) < 0) |
18889231 JC |
175 | goto errcopy; |
176 | ||
a3e6b12c | 177 | return 0; |
18889231 JC |
178 | |
179 | errcopy: | |
180 | for (i = 0; i <= newtbl->hash_mask; i++) { | |
181 | hlist_for_each_safe(p, q, &newtbl->hash_buckets[i]) | |
a3e6b12c | 182 | oldtbl->free_node(p, 0); |
18889231 | 183 | } |
a3e6b12c | 184 | return -ENOMEM; |
18889231 JC |
185 | } |
186 | ||
4a3cb702 | 187 | static u32 mesh_table_hash(const u8 *addr, struct ieee80211_sub_if_data *sdata, |
6b86bd62 JB |
188 | struct mesh_table *tbl) |
189 | { | |
190 | /* Use last four bytes of hw addr and interface index as hash index */ | |
bf7cd94d JB |
191 | return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, |
192 | tbl->hash_rnd) & tbl->hash_mask; | |
6b86bd62 | 193 | } |
f5ea9120 | 194 | |
eb2b9311 LCC |
195 | |
196 | /** | |
197 | * | |
198 | * mesh_path_assign_nexthop - update mesh path next hop | |
199 | * | |
200 | * @mpath: mesh path to update | |
201 | * @sta: next hop to assign | |
202 | * | |
203 | * Locking: mpath->state_lock must be held when calling this function | |
204 | */ | |
205 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) | |
206 | { | |
10c836d7 JC |
207 | struct sk_buff *skb; |
208 | struct ieee80211_hdr *hdr; | |
10c836d7 JC |
209 | unsigned long flags; |
210 | ||
d0709a65 | 211 | rcu_assign_pointer(mpath->next_hop, sta); |
10c836d7 | 212 | |
10c836d7 | 213 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
b22bd522 | 214 | skb_queue_walk(&mpath->frame_queue, skb) { |
10c836d7 JC |
215 | hdr = (struct ieee80211_hdr *) skb->data; |
216 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); | |
7e3c8866 | 217 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
3f52b7e3 | 218 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
10c836d7 JC |
219 | } |
220 | ||
10c836d7 | 221 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
eb2b9311 LCC |
222 | } |
223 | ||
5ee68e5b JC |
224 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
225 | struct mesh_path *gate_mpath) | |
226 | { | |
227 | struct ieee80211_hdr *hdr; | |
228 | struct ieee80211s_hdr *mshdr; | |
229 | int mesh_hdrlen, hdrlen; | |
230 | char *next_hop; | |
231 | ||
232 | hdr = (struct ieee80211_hdr *) skb->data; | |
233 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
234 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
235 | ||
236 | if (!(mshdr->flags & MESH_FLAGS_AE)) { | |
237 | /* size of the fixed part of the mesh header */ | |
238 | mesh_hdrlen = 6; | |
239 | ||
240 | /* make room for the two extended addresses */ | |
241 | skb_push(skb, 2 * ETH_ALEN); | |
242 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); | |
243 | ||
244 | hdr = (struct ieee80211_hdr *) skb->data; | |
245 | ||
246 | /* we preserve the previous mesh header and only add | |
247 | * the new addreses */ | |
248 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
249 | mshdr->flags = MESH_FLAGS_AE_A5_A6; | |
250 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); | |
251 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); | |
252 | } | |
253 | ||
254 | /* update next hop */ | |
255 | hdr = (struct ieee80211_hdr *) skb->data; | |
256 | rcu_read_lock(); | |
257 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; | |
258 | memcpy(hdr->addr1, next_hop, ETH_ALEN); | |
259 | rcu_read_unlock(); | |
7e3c8866 | 260 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
5ee68e5b JC |
261 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
262 | } | |
263 | ||
264 | /** | |
265 | * | |
266 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another | |
267 | * | |
268 | * This function is used to transfer or copy frames from an unresolved mpath to | |
269 | * a gate mpath. The function also adds the Address Extension field and | |
270 | * updates the next hop. | |
271 | * | |
272 | * If a frame already has an Address Extension field, only the next hop and | |
273 | * destination addresses are updated. | |
274 | * | |
275 | * The gate mpath must be an active mpath with a valid mpath->next_hop. | |
276 | * | |
277 | * @mpath: An active mpath the frames will be sent to (i.e. the gate) | |
278 | * @from_mpath: The failed mpath | |
279 | * @copy: When true, copy all the frames to the new mpath queue. When false, | |
280 | * move them. | |
281 | */ | |
282 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, | |
283 | struct mesh_path *from_mpath, | |
284 | bool copy) | |
285 | { | |
4bd4c2dd TP |
286 | struct sk_buff *skb, *fskb, *tmp; |
287 | struct sk_buff_head failq; | |
5ee68e5b | 288 | unsigned long flags; |
5ee68e5b | 289 | |
8c5bb1fa JB |
290 | if (WARN_ON(gate_mpath == from_mpath)) |
291 | return; | |
292 | if (WARN_ON(!gate_mpath->next_hop)) | |
293 | return; | |
5ee68e5b | 294 | |
5ee68e5b JC |
295 | __skb_queue_head_init(&failq); |
296 | ||
297 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
298 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); | |
299 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
300 | ||
4bd4c2dd TP |
301 | skb_queue_walk_safe(&failq, fskb, tmp) { |
302 | if (skb_queue_len(&gate_mpath->frame_queue) >= | |
303 | MESH_FRAME_QUEUE_LEN) { | |
304 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); | |
305 | break; | |
817a53d9 | 306 | } |
5ee68e5b | 307 | |
4bd4c2dd TP |
308 | skb = skb_copy(fskb, GFP_ATOMIC); |
309 | if (WARN_ON(!skb)) | |
310 | break; | |
311 | ||
5ee68e5b | 312 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
4bd4c2dd TP |
313 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
314 | ||
315 | if (copy) | |
316 | continue; | |
317 | ||
318 | __skb_unlink(fskb, &failq); | |
319 | kfree_skb(fskb); | |
5ee68e5b JC |
320 | } |
321 | ||
bdcbd8e0 JB |
322 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
323 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); | |
5ee68e5b JC |
324 | |
325 | if (!copy) | |
326 | return; | |
327 | ||
328 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
329 | skb_queue_splice(&failq, &from_mpath->frame_queue); | |
330 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
331 | } | |
332 | ||
eb2b9311 | 333 | |
4a3cb702 JB |
334 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
335 | struct ieee80211_sub_if_data *sdata) | |
eb2b9311 LCC |
336 | { |
337 | struct mesh_path *mpath; | |
eb2b9311 | 338 | struct hlist_head *bucket; |
eb2b9311 LCC |
339 | struct mpath_node *node; |
340 | ||
f698d856 | 341 | bucket = &tbl->hash_buckets[mesh_table_hash(dst, sdata, tbl)]; |
b67bfe0d | 342 | hlist_for_each_entry_rcu(node, bucket, list) { |
eb2b9311 | 343 | mpath = node->mpath; |
f698d856 | 344 | if (mpath->sdata == sdata && |
b203ca39 | 345 | ether_addr_equal(dst, mpath->dst)) { |
bf7cd94d | 346 | if (mpath_expired(mpath)) { |
eb2b9311 | 347 | spin_lock_bh(&mpath->state_lock); |
ad99d141 | 348 | mpath->flags &= ~MESH_PATH_ACTIVE; |
eb2b9311 LCC |
349 | spin_unlock_bh(&mpath->state_lock); |
350 | } | |
351 | return mpath; | |
352 | } | |
353 | } | |
354 | return NULL; | |
355 | } | |
356 | ||
239289e4 JC |
357 | /** |
358 | * mesh_path_lookup - look up a path in the mesh path table | |
239289e4 | 359 | * @sdata: local subif |
bf7cd94d | 360 | * @dst: hardware address (ETH_ALEN length) of destination |
239289e4 JC |
361 | * |
362 | * Returns: pointer to the mesh path structure, or NULL if not found | |
363 | * | |
364 | * Locking: must be called within a read rcu section. | |
365 | */ | |
bf7cd94d JB |
366 | struct mesh_path * |
367 | mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
79617dee | 368 | { |
5ad20dd1 | 369 | return mpath_lookup(rcu_dereference(mesh_paths), dst, sdata); |
239289e4 | 370 | } |
79617dee | 371 | |
bf7cd94d JB |
372 | struct mesh_path * |
373 | mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
239289e4 | 374 | { |
5ad20dd1 | 375 | return mpath_lookup(rcu_dereference(mpp_paths), dst, sdata); |
79617dee Y |
376 | } |
377 | ||
378 | ||
eb2b9311 LCC |
379 | /** |
380 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index | |
381 | * @idx: index | |
f698d856 | 382 | * @sdata: local subif, or NULL for all entries |
eb2b9311 LCC |
383 | * |
384 | * Returns: pointer to the mesh path structure, or NULL if not found. | |
385 | * | |
386 | * Locking: must be called within a read rcu section. | |
387 | */ | |
bf7cd94d JB |
388 | struct mesh_path * |
389 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
eb2b9311 | 390 | { |
349eb8cf | 391 | struct mesh_table *tbl = rcu_dereference(mesh_paths); |
eb2b9311 | 392 | struct mpath_node *node; |
eb2b9311 LCC |
393 | int i; |
394 | int j = 0; | |
395 | ||
b67bfe0d | 396 | for_each_mesh_entry(tbl, node, i) { |
f698d856 | 397 | if (sdata && node->mpath->sdata != sdata) |
2a8ca29a | 398 | continue; |
eb2b9311 | 399 | if (j++ == idx) { |
bf7cd94d | 400 | if (mpath_expired(node->mpath)) { |
eb2b9311 | 401 | spin_lock_bh(&node->mpath->state_lock); |
ad99d141 | 402 | node->mpath->flags &= ~MESH_PATH_ACTIVE; |
eb2b9311 LCC |
403 | spin_unlock_bh(&node->mpath->state_lock); |
404 | } | |
405 | return node->mpath; | |
406 | } | |
2a8ca29a | 407 | } |
eb2b9311 LCC |
408 | |
409 | return NULL; | |
410 | } | |
411 | ||
a2db2ed3 HR |
412 | /** |
413 | * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index | |
414 | * @idx: index | |
415 | * @sdata: local subif, or NULL for all entries | |
416 | * | |
417 | * Returns: pointer to the proxy path structure, or NULL if not found. | |
418 | * | |
419 | * Locking: must be called within a read rcu section. | |
420 | */ | |
421 | struct mesh_path * | |
422 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
423 | { | |
424 | struct mesh_table *tbl = rcu_dereference(mpp_paths); | |
425 | struct mpath_node *node; | |
426 | int i; | |
427 | int j = 0; | |
428 | ||
429 | for_each_mesh_entry(tbl, node, i) { | |
430 | if (sdata && node->mpath->sdata != sdata) | |
431 | continue; | |
432 | if (j++ == idx) | |
433 | return node->mpath; | |
434 | } | |
435 | ||
436 | return NULL; | |
437 | } | |
438 | ||
5ee68e5b | 439 | /** |
30be52e4 JB |
440 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
441 | * @mpath: gate path to add to table | |
5ee68e5b | 442 | */ |
30be52e4 | 443 | int mesh_path_add_gate(struct mesh_path *mpath) |
5ee68e5b | 444 | { |
30be52e4 | 445 | struct mesh_table *tbl; |
5ee68e5b | 446 | struct mpath_node *gate, *new_gate; |
5ee68e5b JC |
447 | int err; |
448 | ||
449 | rcu_read_lock(); | |
30be52e4 | 450 | tbl = rcu_dereference(mesh_paths); |
5ee68e5b | 451 | |
b67bfe0d | 452 | hlist_for_each_entry_rcu(gate, tbl->known_gates, list) |
5ee68e5b JC |
453 | if (gate->mpath == mpath) { |
454 | err = -EEXIST; | |
455 | goto err_rcu; | |
456 | } | |
457 | ||
458 | new_gate = kzalloc(sizeof(struct mpath_node), GFP_ATOMIC); | |
459 | if (!new_gate) { | |
460 | err = -ENOMEM; | |
461 | goto err_rcu; | |
462 | } | |
463 | ||
464 | mpath->is_gate = true; | |
465 | mpath->sdata->u.mesh.num_gates++; | |
466 | new_gate->mpath = mpath; | |
467 | spin_lock_bh(&tbl->gates_lock); | |
468 | hlist_add_head_rcu(&new_gate->list, tbl->known_gates); | |
469 | spin_unlock_bh(&tbl->gates_lock); | |
bdcbd8e0 JB |
470 | mpath_dbg(mpath->sdata, |
471 | "Mesh path: Recorded new gate: %pM. %d known gates\n", | |
472 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
bf7cd94d | 473 | err = 0; |
5ee68e5b JC |
474 | err_rcu: |
475 | rcu_read_unlock(); | |
476 | return err; | |
477 | } | |
478 | ||
479 | /** | |
480 | * mesh_gate_del - remove a mesh gate from the list of known gates | |
481 | * @tbl: table which holds our list of known gates | |
482 | * @mpath: gate mpath | |
483 | * | |
5ee68e5b JC |
484 | * Locking: must be called inside rcu_read_lock() section |
485 | */ | |
bf7cd94d | 486 | static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
5ee68e5b JC |
487 | { |
488 | struct mpath_node *gate; | |
b67bfe0d | 489 | struct hlist_node *q; |
5ee68e5b | 490 | |
b67bfe0d | 491 | hlist_for_each_entry_safe(gate, q, tbl->known_gates, list) { |
bf7cd94d JB |
492 | if (gate->mpath != mpath) |
493 | continue; | |
494 | spin_lock_bh(&tbl->gates_lock); | |
495 | hlist_del_rcu(&gate->list); | |
496 | kfree_rcu(gate, rcu); | |
497 | spin_unlock_bh(&tbl->gates_lock); | |
498 | mpath->sdata->u.mesh.num_gates--; | |
499 | mpath->is_gate = false; | |
500 | mpath_dbg(mpath->sdata, | |
501 | "Mesh path: Deleted gate: %pM. %d known gates\n", | |
502 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
503 | break; | |
504 | } | |
5ee68e5b JC |
505 | } |
506 | ||
5ee68e5b JC |
507 | /** |
508 | * mesh_gate_num - number of gates known to this interface | |
509 | * @sdata: subif data | |
510 | */ | |
511 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) | |
512 | { | |
513 | return sdata->u.mesh.num_gates; | |
514 | } | |
515 | ||
eb2b9311 LCC |
516 | /** |
517 | * mesh_path_add - allocate and add a new path to the mesh path table | |
bf7cd94d | 518 | * @dst: destination address of the path (ETH_ALEN length) |
f698d856 | 519 | * @sdata: local subif |
eb2b9311 | 520 | * |
af901ca1 | 521 | * Returns: 0 on success |
eb2b9311 LCC |
522 | * |
523 | * State: the initial state of the new path is set to 0 | |
524 | */ | |
ae76eef0 BC |
525 | struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
526 | const u8 *dst) | |
eb2b9311 | 527 | { |
18889231 JC |
528 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
529 | struct ieee80211_local *local = sdata->local; | |
349eb8cf | 530 | struct mesh_table *tbl; |
eb2b9311 LCC |
531 | struct mesh_path *mpath, *new_mpath; |
532 | struct mpath_node *node, *new_node; | |
533 | struct hlist_head *bucket; | |
eb2b9311 | 534 | int grow = 0; |
ae76eef0 | 535 | int err; |
eb2b9311 LCC |
536 | u32 hash_idx; |
537 | ||
b203ca39 | 538 | if (ether_addr_equal(dst, sdata->vif.addr)) |
eb2b9311 | 539 | /* never add ourselves as neighbours */ |
ae76eef0 | 540 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 LCC |
541 | |
542 | if (is_multicast_ether_addr(dst)) | |
ae76eef0 | 543 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 | 544 | |
472dbc45 | 545 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
ae76eef0 BC |
546 | return ERR_PTR(-ENOSPC); |
547 | ||
548 | read_lock_bh(&pathtbl_resize_lock); | |
549 | tbl = resize_dereference_mesh_paths(); | |
550 | ||
551 | hash_idx = mesh_table_hash(dst, sdata, tbl); | |
552 | bucket = &tbl->hash_buckets[hash_idx]; | |
553 | ||
554 | spin_lock(&tbl->hashwlock[hash_idx]); | |
555 | ||
556 | hlist_for_each_entry(node, bucket, list) { | |
557 | mpath = node->mpath; | |
558 | if (mpath->sdata == sdata && | |
559 | ether_addr_equal(dst, mpath->dst)) | |
560 | goto found; | |
561 | } | |
eb2b9311 | 562 | |
402d7752 | 563 | err = -ENOMEM; |
18889231 | 564 | new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC); |
402d7752 PE |
565 | if (!new_mpath) |
566 | goto err_path_alloc; | |
567 | ||
18889231 | 568 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
402d7752 PE |
569 | if (!new_node) |
570 | goto err_node_alloc; | |
f84e71a9 | 571 | |
eb2b9311 | 572 | memcpy(new_mpath->dst, dst, ETH_ALEN); |
e83e6541 | 573 | eth_broadcast_addr(new_mpath->rann_snd_addr); |
35bcd591 | 574 | new_mpath->is_root = false; |
f698d856 | 575 | new_mpath->sdata = sdata; |
eb2b9311 LCC |
576 | new_mpath->flags = 0; |
577 | skb_queue_head_init(&new_mpath->frame_queue); | |
eb2b9311 LCC |
578 | new_node->mpath = new_mpath; |
579 | new_mpath->timer.data = (unsigned long) new_mpath; | |
580 | new_mpath->timer.function = mesh_path_timer; | |
581 | new_mpath->exp_time = jiffies; | |
582 | spin_lock_init(&new_mpath->state_lock); | |
583 | init_timer(&new_mpath->timer); | |
584 | ||
eb2b9311 | 585 | hlist_add_head_rcu(&new_node->list, bucket); |
349eb8cf | 586 | if (atomic_inc_return(&tbl->entries) >= |
3f73fe9f | 587 | MEAN_CHAIN_LEN * (tbl->hash_mask + 1)) |
eb2b9311 LCC |
588 | grow = 1; |
589 | ||
f5ea9120 JB |
590 | mesh_paths_generation++; |
591 | ||
402d7752 | 592 | if (grow) { |
18889231 | 593 | set_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags); |
64592c8f | 594 | ieee80211_queue_work(&local->hw, &sdata->work); |
eb2b9311 | 595 | } |
ae76eef0 BC |
596 | mpath = new_mpath; |
597 | found: | |
f06c7885 | 598 | spin_unlock(&tbl->hashwlock[hash_idx]); |
9b84b808 | 599 | read_unlock_bh(&pathtbl_resize_lock); |
ae76eef0 BC |
600 | return mpath; |
601 | ||
402d7752 PE |
602 | err_node_alloc: |
603 | kfree(new_mpath); | |
604 | err_path_alloc: | |
472dbc45 | 605 | atomic_dec(&sdata->u.mesh.mpaths); |
ae76eef0 BC |
606 | spin_unlock(&tbl->hashwlock[hash_idx]); |
607 | read_unlock_bh(&pathtbl_resize_lock); | |
608 | return ERR_PTR(err); | |
eb2b9311 LCC |
609 | } |
610 | ||
1928ecab JB |
611 | static void mesh_table_free_rcu(struct rcu_head *rcu) |
612 | { | |
613 | struct mesh_table *tbl = container_of(rcu, struct mesh_table, rcu_head); | |
614 | ||
615 | mesh_table_free(tbl, false); | |
616 | } | |
617 | ||
18889231 JC |
618 | void mesh_mpath_table_grow(void) |
619 | { | |
620 | struct mesh_table *oldtbl, *newtbl; | |
621 | ||
9b84b808 | 622 | write_lock_bh(&pathtbl_resize_lock); |
349eb8cf JB |
623 | oldtbl = resize_dereference_mesh_paths(); |
624 | newtbl = mesh_table_alloc(oldtbl->size_order + 1); | |
1928ecab JB |
625 | if (!newtbl) |
626 | goto out; | |
349eb8cf | 627 | if (mesh_table_grow(oldtbl, newtbl) < 0) { |
a3e6b12c | 628 | __mesh_table_free(newtbl); |
1928ecab | 629 | goto out; |
18889231 JC |
630 | } |
631 | rcu_assign_pointer(mesh_paths, newtbl); | |
18889231 | 632 | |
1928ecab JB |
633 | call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu); |
634 | ||
635 | out: | |
636 | write_unlock_bh(&pathtbl_resize_lock); | |
18889231 JC |
637 | } |
638 | ||
639 | void mesh_mpp_table_grow(void) | |
640 | { | |
641 | struct mesh_table *oldtbl, *newtbl; | |
642 | ||
9b84b808 | 643 | write_lock_bh(&pathtbl_resize_lock); |
349eb8cf JB |
644 | oldtbl = resize_dereference_mpp_paths(); |
645 | newtbl = mesh_table_alloc(oldtbl->size_order + 1); | |
1928ecab JB |
646 | if (!newtbl) |
647 | goto out; | |
349eb8cf | 648 | if (mesh_table_grow(oldtbl, newtbl) < 0) { |
a3e6b12c | 649 | __mesh_table_free(newtbl); |
1928ecab | 650 | goto out; |
18889231 JC |
651 | } |
652 | rcu_assign_pointer(mpp_paths, newtbl); | |
1928ecab | 653 | call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu); |
18889231 | 654 | |
1928ecab JB |
655 | out: |
656 | write_unlock_bh(&pathtbl_resize_lock); | |
18889231 | 657 | } |
eb2b9311 | 658 | |
bf7cd94d JB |
659 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
660 | const u8 *dst, const u8 *mpp) | |
79617dee | 661 | { |
18889231 JC |
662 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
663 | struct ieee80211_local *local = sdata->local; | |
349eb8cf | 664 | struct mesh_table *tbl; |
79617dee Y |
665 | struct mesh_path *mpath, *new_mpath; |
666 | struct mpath_node *node, *new_node; | |
667 | struct hlist_head *bucket; | |
79617dee Y |
668 | int grow = 0; |
669 | int err = 0; | |
670 | u32 hash_idx; | |
671 | ||
b203ca39 | 672 | if (ether_addr_equal(dst, sdata->vif.addr)) |
79617dee Y |
673 | /* never add ourselves as neighbours */ |
674 | return -ENOTSUPP; | |
675 | ||
676 | if (is_multicast_ether_addr(dst)) | |
677 | return -ENOTSUPP; | |
678 | ||
679 | err = -ENOMEM; | |
18889231 | 680 | new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC); |
79617dee Y |
681 | if (!new_mpath) |
682 | goto err_path_alloc; | |
683 | ||
18889231 | 684 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
79617dee Y |
685 | if (!new_node) |
686 | goto err_node_alloc; | |
687 | ||
9b84b808 | 688 | read_lock_bh(&pathtbl_resize_lock); |
79617dee Y |
689 | memcpy(new_mpath->dst, dst, ETH_ALEN); |
690 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); | |
691 | new_mpath->sdata = sdata; | |
692 | new_mpath->flags = 0; | |
693 | skb_queue_head_init(&new_mpath->frame_queue); | |
694 | new_node->mpath = new_mpath; | |
c6133661 | 695 | init_timer(&new_mpath->timer); |
79617dee Y |
696 | new_mpath->exp_time = jiffies; |
697 | spin_lock_init(&new_mpath->state_lock); | |
698 | ||
349eb8cf | 699 | tbl = resize_dereference_mpp_paths(); |
79617dee | 700 | |
349eb8cf JB |
701 | hash_idx = mesh_table_hash(dst, sdata, tbl); |
702 | bucket = &tbl->hash_buckets[hash_idx]; | |
703 | ||
f06c7885 | 704 | spin_lock(&tbl->hashwlock[hash_idx]); |
79617dee Y |
705 | |
706 | err = -EEXIST; | |
b67bfe0d | 707 | hlist_for_each_entry(node, bucket, list) { |
79617dee | 708 | mpath = node->mpath; |
888d04df | 709 | if (mpath->sdata == sdata && |
b203ca39 | 710 | ether_addr_equal(dst, mpath->dst)) |
79617dee Y |
711 | goto err_exists; |
712 | } | |
713 | ||
714 | hlist_add_head_rcu(&new_node->list, bucket); | |
349eb8cf | 715 | if (atomic_inc_return(&tbl->entries) >= |
3f73fe9f | 716 | MEAN_CHAIN_LEN * (tbl->hash_mask + 1)) |
79617dee Y |
717 | grow = 1; |
718 | ||
f06c7885 | 719 | spin_unlock(&tbl->hashwlock[hash_idx]); |
9b84b808 | 720 | read_unlock_bh(&pathtbl_resize_lock); |
a2db2ed3 HR |
721 | |
722 | mpp_paths_generation++; | |
723 | ||
79617dee | 724 | if (grow) { |
18889231 | 725 | set_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags); |
64592c8f | 726 | ieee80211_queue_work(&local->hw, &sdata->work); |
79617dee Y |
727 | } |
728 | return 0; | |
729 | ||
730 | err_exists: | |
f06c7885 | 731 | spin_unlock(&tbl->hashwlock[hash_idx]); |
9b84b808 | 732 | read_unlock_bh(&pathtbl_resize_lock); |
79617dee Y |
733 | kfree(new_node); |
734 | err_node_alloc: | |
735 | kfree(new_mpath); | |
736 | err_path_alloc: | |
737 | return err; | |
738 | } | |
739 | ||
740 | ||
eb2b9311 LCC |
741 | /** |
742 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks | |
743 | * | |
744 | * @sta: broken peer link | |
745 | * | |
746 | * This function must be called from the rate control algorithm if enough | |
747 | * delivery errors suggest that a peer link is no longer usable. | |
748 | */ | |
749 | void mesh_plink_broken(struct sta_info *sta) | |
750 | { | |
349eb8cf | 751 | struct mesh_table *tbl; |
15ff6365 | 752 | static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
eb2b9311 LCC |
753 | struct mesh_path *mpath; |
754 | struct mpath_node *node; | |
f698d856 | 755 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
eb2b9311 LCC |
756 | int i; |
757 | ||
758 | rcu_read_lock(); | |
349eb8cf | 759 | tbl = rcu_dereference(mesh_paths); |
b67bfe0d | 760 | for_each_mesh_entry(tbl, node, i) { |
eb2b9311 | 761 | mpath = node->mpath; |
2688eba9 | 762 | if (rcu_access_pointer(mpath->next_hop) == sta && |
eb2b9311 LCC |
763 | mpath->flags & MESH_PATH_ACTIVE && |
764 | !(mpath->flags & MESH_PATH_FIXED)) { | |
f5e50cd0 | 765 | spin_lock_bh(&mpath->state_lock); |
eb2b9311 | 766 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 767 | ++mpath->sn; |
eb2b9311 | 768 | spin_unlock_bh(&mpath->state_lock); |
bf7cd94d | 769 | mesh_path_error_tx(sdata, |
f63f8421 CYY |
770 | sdata->u.mesh.mshcfg.element_ttl, |
771 | mpath->dst, mpath->sn, | |
772 | WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); | |
f5e50cd0 | 773 | } |
eb2b9311 LCC |
774 | } |
775 | rcu_read_unlock(); | |
776 | } | |
777 | ||
19c50b3d JC |
778 | static void mesh_path_node_reclaim(struct rcu_head *rp) |
779 | { | |
780 | struct mpath_node *node = container_of(rp, struct mpath_node, rcu); | |
19c50b3d JC |
781 | |
782 | del_timer_sync(&node->mpath->timer); | |
19c50b3d JC |
783 | kfree(node->mpath); |
784 | kfree(node); | |
785 | } | |
786 | ||
787 | /* needs to be called with the corresponding hashwlock taken */ | |
788 | static void __mesh_path_del(struct mesh_table *tbl, struct mpath_node *node) | |
789 | { | |
c2e703a5 JB |
790 | struct mesh_path *mpath = node->mpath; |
791 | struct ieee80211_sub_if_data *sdata = node->mpath->sdata; | |
792 | ||
19c50b3d JC |
793 | spin_lock(&mpath->state_lock); |
794 | mpath->flags |= MESH_PATH_RESOLVING; | |
795 | if (mpath->is_gate) | |
796 | mesh_gate_del(tbl, mpath); | |
797 | hlist_del_rcu(&node->list); | |
798 | call_rcu(&node->rcu, mesh_path_node_reclaim); | |
799 | spin_unlock(&mpath->state_lock); | |
c2e703a5 | 800 | atomic_dec(&sdata->u.mesh.mpaths); |
19c50b3d JC |
801 | atomic_dec(&tbl->entries); |
802 | } | |
803 | ||
eb2b9311 LCC |
804 | /** |
805 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches | |
806 | * | |
2c53040f | 807 | * @sta: mesh peer to match |
eb2b9311 | 808 | * |
b4e08ea1 LCC |
809 | * RCU notes: this function is called when a mesh plink transitions from |
810 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that | |
811 | * allows path creation. This will happen before the sta can be freed (because | |
d0709a65 JB |
812 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
813 | * protected against the plink disappearing. | |
eb2b9311 LCC |
814 | */ |
815 | void mesh_path_flush_by_nexthop(struct sta_info *sta) | |
816 | { | |
349eb8cf | 817 | struct mesh_table *tbl; |
eb2b9311 LCC |
818 | struct mesh_path *mpath; |
819 | struct mpath_node *node; | |
eb2b9311 LCC |
820 | int i; |
821 | ||
349eb8cf | 822 | rcu_read_lock(); |
239289e4 JC |
823 | read_lock_bh(&pathtbl_resize_lock); |
824 | tbl = resize_dereference_mesh_paths(); | |
b67bfe0d | 825 | for_each_mesh_entry(tbl, node, i) { |
eb2b9311 | 826 | mpath = node->mpath; |
2688eba9 | 827 | if (rcu_access_pointer(mpath->next_hop) == sta) { |
f06c7885 | 828 | spin_lock(&tbl->hashwlock[i]); |
19c50b3d | 829 | __mesh_path_del(tbl, node); |
f06c7885 | 830 | spin_unlock(&tbl->hashwlock[i]); |
19c50b3d | 831 | } |
eb2b9311 | 832 | } |
239289e4 | 833 | read_unlock_bh(&pathtbl_resize_lock); |
349eb8cf | 834 | rcu_read_unlock(); |
eb2b9311 LCC |
835 | } |
836 | ||
bf5a70e1 HR |
837 | static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
838 | const u8 *proxy) | |
839 | { | |
840 | struct mesh_table *tbl; | |
841 | struct mesh_path *mpp; | |
842 | struct mpath_node *node; | |
843 | int i; | |
844 | ||
845 | rcu_read_lock(); | |
846 | read_lock_bh(&pathtbl_resize_lock); | |
847 | tbl = resize_dereference_mpp_paths(); | |
848 | for_each_mesh_entry(tbl, node, i) { | |
849 | mpp = node->mpath; | |
850 | if (ether_addr_equal(mpp->mpp, proxy)) { | |
851 | spin_lock(&tbl->hashwlock[i]); | |
852 | __mesh_path_del(tbl, node); | |
853 | spin_unlock(&tbl->hashwlock[i]); | |
854 | } | |
855 | } | |
856 | read_unlock_bh(&pathtbl_resize_lock); | |
857 | rcu_read_unlock(); | |
858 | } | |
859 | ||
cd72e817 JC |
860 | static void table_flush_by_iface(struct mesh_table *tbl, |
861 | struct ieee80211_sub_if_data *sdata) | |
eb2b9311 LCC |
862 | { |
863 | struct mesh_path *mpath; | |
864 | struct mpath_node *node; | |
eb2b9311 LCC |
865 | int i; |
866 | ||
cd72e817 | 867 | WARN_ON(!rcu_read_lock_held()); |
b67bfe0d | 868 | for_each_mesh_entry(tbl, node, i) { |
eb2b9311 | 869 | mpath = node->mpath; |
cd72e817 JC |
870 | if (mpath->sdata != sdata) |
871 | continue; | |
ece1a2e7 | 872 | spin_lock_bh(&tbl->hashwlock[i]); |
19c50b3d | 873 | __mesh_path_del(tbl, node); |
ece1a2e7 | 874 | spin_unlock_bh(&tbl->hashwlock[i]); |
eb2b9311 LCC |
875 | } |
876 | } | |
877 | ||
ece1a2e7 JC |
878 | /** |
879 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface | |
880 | * | |
881 | * This function deletes both mesh paths as well as mesh portal paths. | |
882 | * | |
2c53040f | 883 | * @sdata: interface data to match |
ece1a2e7 JC |
884 | * |
885 | */ | |
886 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) | |
eb2b9311 | 887 | { |
cd72e817 | 888 | struct mesh_table *tbl; |
d0709a65 | 889 | |
cd72e817 | 890 | rcu_read_lock(); |
239289e4 JC |
891 | read_lock_bh(&pathtbl_resize_lock); |
892 | tbl = resize_dereference_mesh_paths(); | |
cd72e817 | 893 | table_flush_by_iface(tbl, sdata); |
239289e4 | 894 | tbl = resize_dereference_mpp_paths(); |
cd72e817 | 895 | table_flush_by_iface(tbl, sdata); |
239289e4 | 896 | read_unlock_bh(&pathtbl_resize_lock); |
cd72e817 | 897 | rcu_read_unlock(); |
eb2b9311 LCC |
898 | } |
899 | ||
900 | /** | |
901 | * mesh_path_del - delete a mesh path from the table | |
902 | * | |
903 | * @addr: dst address (ETH_ALEN length) | |
f698d856 | 904 | * @sdata: local subif |
eb2b9311 | 905 | * |
af901ca1 | 906 | * Returns: 0 if successful |
eb2b9311 | 907 | */ |
bf7cd94d | 908 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
eb2b9311 | 909 | { |
349eb8cf | 910 | struct mesh_table *tbl; |
eb2b9311 LCC |
911 | struct mesh_path *mpath; |
912 | struct mpath_node *node; | |
913 | struct hlist_head *bucket; | |
eb2b9311 LCC |
914 | int hash_idx; |
915 | int err = 0; | |
916 | ||
bf5a70e1 HR |
917 | /* flush relevant mpp entries first */ |
918 | mpp_flush_by_proxy(sdata, addr); | |
919 | ||
9b84b808 | 920 | read_lock_bh(&pathtbl_resize_lock); |
349eb8cf JB |
921 | tbl = resize_dereference_mesh_paths(); |
922 | hash_idx = mesh_table_hash(addr, sdata, tbl); | |
923 | bucket = &tbl->hash_buckets[hash_idx]; | |
eb2b9311 | 924 | |
f06c7885 | 925 | spin_lock(&tbl->hashwlock[hash_idx]); |
b67bfe0d | 926 | hlist_for_each_entry(node, bucket, list) { |
eb2b9311 | 927 | mpath = node->mpath; |
f698d856 | 928 | if (mpath->sdata == sdata && |
b203ca39 | 929 | ether_addr_equal(addr, mpath->dst)) { |
19c50b3d | 930 | __mesh_path_del(tbl, node); |
eb2b9311 LCC |
931 | goto enddel; |
932 | } | |
933 | } | |
934 | ||
935 | err = -ENXIO; | |
936 | enddel: | |
f5ea9120 | 937 | mesh_paths_generation++; |
f06c7885 | 938 | spin_unlock(&tbl->hashwlock[hash_idx]); |
9b84b808 | 939 | read_unlock_bh(&pathtbl_resize_lock); |
eb2b9311 LCC |
940 | return err; |
941 | } | |
942 | ||
943 | /** | |
944 | * mesh_path_tx_pending - sends pending frames in a mesh path queue | |
945 | * | |
946 | * @mpath: mesh path to activate | |
947 | * | |
948 | * Locking: the state_lock of the mpath structure must NOT be held when calling | |
949 | * this function. | |
950 | */ | |
951 | void mesh_path_tx_pending(struct mesh_path *mpath) | |
952 | { | |
249b405c JC |
953 | if (mpath->flags & MESH_PATH_ACTIVE) |
954 | ieee80211_add_pending_skbs(mpath->sdata->local, | |
955 | &mpath->frame_queue); | |
eb2b9311 LCC |
956 | } |
957 | ||
5ee68e5b JC |
958 | /** |
959 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates | |
960 | * | |
961 | * @mpath: mesh path whose queue will be emptied | |
962 | * | |
963 | * If there is only one gate, the frames are transferred from the failed mpath | |
964 | * queue to that gate's queue. If there are more than one gates, the frames | |
965 | * are copied from each gate to the next. After frames are copied, the | |
966 | * mpath queues are emptied onto the transmission queue. | |
967 | */ | |
968 | int mesh_path_send_to_gates(struct mesh_path *mpath) | |
969 | { | |
970 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b JC |
971 | struct mesh_table *tbl; |
972 | struct mesh_path *from_mpath = mpath; | |
973 | struct mpath_node *gate = NULL; | |
974 | bool copy = false; | |
975 | struct hlist_head *known_gates; | |
976 | ||
977 | rcu_read_lock(); | |
978 | tbl = rcu_dereference(mesh_paths); | |
979 | known_gates = tbl->known_gates; | |
980 | rcu_read_unlock(); | |
981 | ||
982 | if (!known_gates) | |
983 | return -EHOSTUNREACH; | |
984 | ||
b67bfe0d | 985 | hlist_for_each_entry_rcu(gate, known_gates, list) { |
5ee68e5b JC |
986 | if (gate->mpath->sdata != sdata) |
987 | continue; | |
988 | ||
989 | if (gate->mpath->flags & MESH_PATH_ACTIVE) { | |
bdcbd8e0 | 990 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->mpath->dst); |
5ee68e5b JC |
991 | mesh_path_move_to_queue(gate->mpath, from_mpath, copy); |
992 | from_mpath = gate->mpath; | |
993 | copy = true; | |
994 | } else { | |
bdcbd8e0 | 995 | mpath_dbg(sdata, |
d671b2a0 JB |
996 | "Not forwarding to %pM (flags %#x)\n", |
997 | gate->mpath->dst, gate->mpath->flags); | |
5ee68e5b JC |
998 | } |
999 | } | |
1000 | ||
b67bfe0d | 1001 | hlist_for_each_entry_rcu(gate, known_gates, list) |
5ee68e5b | 1002 | if (gate->mpath->sdata == sdata) { |
bdcbd8e0 | 1003 | mpath_dbg(sdata, "Sending to %pM\n", gate->mpath->dst); |
5ee68e5b JC |
1004 | mesh_path_tx_pending(gate->mpath); |
1005 | } | |
1006 | ||
1007 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; | |
1008 | } | |
1009 | ||
eb2b9311 LCC |
1010 | /** |
1011 | * mesh_path_discard_frame - discard a frame whose path could not be resolved | |
1012 | * | |
1013 | * @skb: frame to discard | |
f698d856 | 1014 | * @sdata: network subif the frame was to be sent through |
eb2b9311 | 1015 | * |
eb2b9311 LCC |
1016 | * Locking: the function must me called within a rcu_read_lock region |
1017 | */ | |
bf7cd94d JB |
1018 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
1019 | struct sk_buff *skb) | |
eb2b9311 | 1020 | { |
eb2b9311 | 1021 | kfree_skb(skb); |
472dbc45 | 1022 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
eb2b9311 LCC |
1023 | } |
1024 | ||
1025 | /** | |
1026 | * mesh_path_flush_pending - free the pending queue of a mesh path | |
1027 | * | |
1028 | * @mpath: mesh path whose queue has to be freed | |
1029 | * | |
25985edc | 1030 | * Locking: the function must me called within a rcu_read_lock region |
eb2b9311 LCC |
1031 | */ |
1032 | void mesh_path_flush_pending(struct mesh_path *mpath) | |
1033 | { | |
eb2b9311 LCC |
1034 | struct sk_buff *skb; |
1035 | ||
00e3f25c | 1036 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
bf7cd94d | 1037 | mesh_path_discard_frame(mpath->sdata, skb); |
eb2b9311 LCC |
1038 | } |
1039 | ||
1040 | /** | |
1041 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path | |
1042 | * | |
1043 | * @mpath: the mesh path to modify | |
1044 | * @next_hop: the next hop to force | |
1045 | * | |
1046 | * Locking: this function must be called holding mpath->state_lock | |
1047 | */ | |
1048 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) | |
1049 | { | |
1050 | spin_lock_bh(&mpath->state_lock); | |
1051 | mesh_path_assign_nexthop(mpath, next_hop); | |
d19b3bf6 | 1052 | mpath->sn = 0xffff; |
eb2b9311 LCC |
1053 | mpath->metric = 0; |
1054 | mpath->hop_count = 0; | |
1055 | mpath->exp_time = 0; | |
1056 | mpath->flags |= MESH_PATH_FIXED; | |
1057 | mesh_path_activate(mpath); | |
1058 | spin_unlock_bh(&mpath->state_lock); | |
1059 | mesh_path_tx_pending(mpath); | |
1060 | } | |
1061 | ||
1062 | static void mesh_path_node_free(struct hlist_node *p, bool free_leafs) | |
1063 | { | |
1064 | struct mesh_path *mpath; | |
1065 | struct mpath_node *node = hlist_entry(p, struct mpath_node, list); | |
1066 | mpath = node->mpath; | |
1067 | hlist_del_rcu(p); | |
d0df9eec JC |
1068 | if (free_leafs) { |
1069 | del_timer_sync(&mpath->timer); | |
eb2b9311 | 1070 | kfree(mpath); |
d0df9eec | 1071 | } |
eb2b9311 LCC |
1072 | kfree(node); |
1073 | } | |
1074 | ||
4caf86c6 | 1075 | static int mesh_path_node_copy(struct hlist_node *p, struct mesh_table *newtbl) |
eb2b9311 LCC |
1076 | { |
1077 | struct mesh_path *mpath; | |
1078 | struct mpath_node *node, *new_node; | |
1079 | u32 hash_idx; | |
1080 | ||
8566dc3f | 1081 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
00242c40 PE |
1082 | if (new_node == NULL) |
1083 | return -ENOMEM; | |
1084 | ||
eb2b9311 LCC |
1085 | node = hlist_entry(p, struct mpath_node, list); |
1086 | mpath = node->mpath; | |
eb2b9311 | 1087 | new_node->mpath = mpath; |
f698d856 | 1088 | hash_idx = mesh_table_hash(mpath->dst, mpath->sdata, newtbl); |
eb2b9311 LCC |
1089 | hlist_add_head(&new_node->list, |
1090 | &newtbl->hash_buckets[hash_idx]); | |
4caf86c6 | 1091 | return 0; |
eb2b9311 LCC |
1092 | } |
1093 | ||
1094 | int mesh_pathtbl_init(void) | |
1095 | { | |
349eb8cf | 1096 | struct mesh_table *tbl_path, *tbl_mpp; |
4c5ade41 | 1097 | int ret; |
349eb8cf JB |
1098 | |
1099 | tbl_path = mesh_table_alloc(INIT_PATHS_SIZE_ORDER); | |
1100 | if (!tbl_path) | |
79617dee | 1101 | return -ENOMEM; |
349eb8cf JB |
1102 | tbl_path->free_node = &mesh_path_node_free; |
1103 | tbl_path->copy_node = &mesh_path_node_copy; | |
5ee68e5b | 1104 | tbl_path->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC); |
4c5ade41 DC |
1105 | if (!tbl_path->known_gates) { |
1106 | ret = -ENOMEM; | |
1107 | goto free_path; | |
1108 | } | |
5ee68e5b JC |
1109 | INIT_HLIST_HEAD(tbl_path->known_gates); |
1110 | ||
79617dee | 1111 | |
349eb8cf JB |
1112 | tbl_mpp = mesh_table_alloc(INIT_PATHS_SIZE_ORDER); |
1113 | if (!tbl_mpp) { | |
4c5ade41 DC |
1114 | ret = -ENOMEM; |
1115 | goto free_path; | |
79617dee | 1116 | } |
349eb8cf JB |
1117 | tbl_mpp->free_node = &mesh_path_node_free; |
1118 | tbl_mpp->copy_node = &mesh_path_node_copy; | |
5ee68e5b | 1119 | tbl_mpp->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC); |
4c5ade41 DC |
1120 | if (!tbl_mpp->known_gates) { |
1121 | ret = -ENOMEM; | |
1122 | goto free_mpp; | |
1123 | } | |
5ee68e5b | 1124 | INIT_HLIST_HEAD(tbl_mpp->known_gates); |
349eb8cf JB |
1125 | |
1126 | /* Need no locking since this is during init */ | |
1127 | RCU_INIT_POINTER(mesh_paths, tbl_path); | |
1128 | RCU_INIT_POINTER(mpp_paths, tbl_mpp); | |
79617dee | 1129 | |
eb2b9311 | 1130 | return 0; |
4c5ade41 DC |
1131 | |
1132 | free_mpp: | |
1133 | mesh_table_free(tbl_mpp, true); | |
1134 | free_path: | |
1135 | mesh_table_free(tbl_path, true); | |
1136 | return ret; | |
eb2b9311 LCC |
1137 | } |
1138 | ||
f698d856 | 1139 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 1140 | { |
349eb8cf | 1141 | struct mesh_table *tbl; |
eb2b9311 LCC |
1142 | struct mesh_path *mpath; |
1143 | struct mpath_node *node; | |
eb2b9311 LCC |
1144 | int i; |
1145 | ||
349eb8cf JB |
1146 | rcu_read_lock(); |
1147 | tbl = rcu_dereference(mesh_paths); | |
b67bfe0d | 1148 | for_each_mesh_entry(tbl, node, i) { |
f698d856 | 1149 | if (node->mpath->sdata != sdata) |
eb2b9311 LCC |
1150 | continue; |
1151 | mpath = node->mpath; | |
eb2b9311 LCC |
1152 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
1153 | (!(mpath->flags & MESH_PATH_FIXED)) && | |
f5e50cd0 | 1154 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
bf7cd94d | 1155 | mesh_path_del(mpath->sdata, mpath->dst); |
eb2b9311 | 1156 | } |
349eb8cf | 1157 | rcu_read_unlock(); |
eb2b9311 LCC |
1158 | } |
1159 | ||
1160 | void mesh_pathtbl_unregister(void) | |
1161 | { | |
349eb8cf | 1162 | /* no need for locking during exit path */ |
33d480ce ED |
1163 | mesh_table_free(rcu_dereference_protected(mesh_paths, 1), true); |
1164 | mesh_table_free(rcu_dereference_protected(mpp_paths, 1), true); | |
eb2b9311 | 1165 | } |