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 | ||
74932959 BC |
21 | static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath); |
22 | ||
60854fd9 BC |
23 | static u32 mesh_table_hash(const void *addr, u32 len, u32 seed) |
24 | { | |
25 | /* Use last four bytes of hw addr as hash index */ | |
26 | return jhash_1word(*(u32 *)(addr+2), seed); | |
27 | } | |
eb2b9311 | 28 | |
60854fd9 BC |
29 | static const struct rhashtable_params mesh_rht_params = { |
30 | .nelem_hint = 2, | |
31 | .automatic_shrinking = true, | |
32 | .key_len = ETH_ALEN, | |
33 | .key_offset = offsetof(struct mesh_path, dst), | |
34 | .head_offset = offsetof(struct mesh_path, rhash), | |
35 | .hashfn = mesh_table_hash, | |
36 | }; | |
eb2b9311 | 37 | |
bf7cd94d JB |
38 | static inline bool mpath_expired(struct mesh_path *mpath) |
39 | { | |
40 | return (mpath->flags & MESH_PATH_ACTIVE) && | |
41 | time_after(jiffies, mpath->exp_time) && | |
42 | !(mpath->flags & MESH_PATH_FIXED); | |
43 | } | |
eb2b9311 | 44 | |
74932959 | 45 | static void mesh_path_rht_free(void *ptr, void *tblptr) |
349eb8cf | 46 | { |
60854fd9 | 47 | struct mesh_path *mpath = ptr; |
74932959 BC |
48 | struct mesh_table *tbl = tblptr; |
49 | ||
50 | mesh_path_free_rcu(tbl, mpath); | |
349eb8cf JB |
51 | } |
52 | ||
60854fd9 | 53 | static struct mesh_table *mesh_table_alloc(void) |
6b86bd62 | 54 | { |
6b86bd62 JB |
55 | struct mesh_table *newtbl; |
56 | ||
d676ff49 | 57 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); |
6b86bd62 JB |
58 | if (!newtbl) |
59 | return NULL; | |
60 | ||
18b27ff7 | 61 | INIT_HLIST_HEAD(&newtbl->known_gates); |
6b86bd62 | 62 | atomic_set(&newtbl->entries, 0); |
5ee68e5b | 63 | spin_lock_init(&newtbl->gates_lock); |
6b86bd62 JB |
64 | |
65 | return newtbl; | |
66 | } | |
67 | ||
60854fd9 | 68 | static void mesh_table_free(struct mesh_table *tbl) |
18889231 | 69 | { |
60854fd9 | 70 | rhashtable_free_and_destroy(&tbl->rhead, |
74932959 | 71 | mesh_path_rht_free, tbl); |
18889231 JC |
72 | kfree(tbl); |
73 | } | |
74 | ||
eb2b9311 LCC |
75 | /** |
76 | * | |
77 | * mesh_path_assign_nexthop - update mesh path next hop | |
78 | * | |
79 | * @mpath: mesh path to update | |
80 | * @sta: next hop to assign | |
81 | * | |
82 | * Locking: mpath->state_lock must be held when calling this function | |
83 | */ | |
84 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) | |
85 | { | |
10c836d7 JC |
86 | struct sk_buff *skb; |
87 | struct ieee80211_hdr *hdr; | |
10c836d7 JC |
88 | unsigned long flags; |
89 | ||
d0709a65 | 90 | rcu_assign_pointer(mpath->next_hop, sta); |
10c836d7 | 91 | |
10c836d7 | 92 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
b22bd522 | 93 | skb_queue_walk(&mpath->frame_queue, skb) { |
10c836d7 JC |
94 | hdr = (struct ieee80211_hdr *) skb->data; |
95 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); | |
7e3c8866 | 96 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
3f52b7e3 | 97 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
10c836d7 JC |
98 | } |
99 | ||
10c836d7 | 100 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
eb2b9311 LCC |
101 | } |
102 | ||
5ee68e5b JC |
103 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
104 | struct mesh_path *gate_mpath) | |
105 | { | |
106 | struct ieee80211_hdr *hdr; | |
107 | struct ieee80211s_hdr *mshdr; | |
108 | int mesh_hdrlen, hdrlen; | |
109 | char *next_hop; | |
110 | ||
111 | hdr = (struct ieee80211_hdr *) skb->data; | |
112 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
113 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
114 | ||
115 | if (!(mshdr->flags & MESH_FLAGS_AE)) { | |
116 | /* size of the fixed part of the mesh header */ | |
117 | mesh_hdrlen = 6; | |
118 | ||
119 | /* make room for the two extended addresses */ | |
120 | skb_push(skb, 2 * ETH_ALEN); | |
121 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); | |
122 | ||
123 | hdr = (struct ieee80211_hdr *) skb->data; | |
124 | ||
125 | /* we preserve the previous mesh header and only add | |
126 | * the new addreses */ | |
127 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
128 | mshdr->flags = MESH_FLAGS_AE_A5_A6; | |
129 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); | |
130 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); | |
131 | } | |
132 | ||
133 | /* update next hop */ | |
134 | hdr = (struct ieee80211_hdr *) skb->data; | |
135 | rcu_read_lock(); | |
136 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; | |
137 | memcpy(hdr->addr1, next_hop, ETH_ALEN); | |
138 | rcu_read_unlock(); | |
7e3c8866 | 139 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
5ee68e5b JC |
140 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
141 | } | |
142 | ||
143 | /** | |
144 | * | |
145 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another | |
146 | * | |
147 | * This function is used to transfer or copy frames from an unresolved mpath to | |
148 | * a gate mpath. The function also adds the Address Extension field and | |
149 | * updates the next hop. | |
150 | * | |
151 | * If a frame already has an Address Extension field, only the next hop and | |
152 | * destination addresses are updated. | |
153 | * | |
154 | * The gate mpath must be an active mpath with a valid mpath->next_hop. | |
155 | * | |
156 | * @mpath: An active mpath the frames will be sent to (i.e. the gate) | |
157 | * @from_mpath: The failed mpath | |
158 | * @copy: When true, copy all the frames to the new mpath queue. When false, | |
159 | * move them. | |
160 | */ | |
161 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, | |
162 | struct mesh_path *from_mpath, | |
163 | bool copy) | |
164 | { | |
4bd4c2dd TP |
165 | struct sk_buff *skb, *fskb, *tmp; |
166 | struct sk_buff_head failq; | |
5ee68e5b | 167 | unsigned long flags; |
5ee68e5b | 168 | |
8c5bb1fa JB |
169 | if (WARN_ON(gate_mpath == from_mpath)) |
170 | return; | |
171 | if (WARN_ON(!gate_mpath->next_hop)) | |
172 | return; | |
5ee68e5b | 173 | |
5ee68e5b JC |
174 | __skb_queue_head_init(&failq); |
175 | ||
176 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
177 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); | |
178 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
179 | ||
4bd4c2dd TP |
180 | skb_queue_walk_safe(&failq, fskb, tmp) { |
181 | if (skb_queue_len(&gate_mpath->frame_queue) >= | |
182 | MESH_FRAME_QUEUE_LEN) { | |
183 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); | |
184 | break; | |
817a53d9 | 185 | } |
5ee68e5b | 186 | |
4bd4c2dd TP |
187 | skb = skb_copy(fskb, GFP_ATOMIC); |
188 | if (WARN_ON(!skb)) | |
189 | break; | |
190 | ||
5ee68e5b | 191 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
4bd4c2dd TP |
192 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
193 | ||
194 | if (copy) | |
195 | continue; | |
196 | ||
197 | __skb_unlink(fskb, &failq); | |
198 | kfree_skb(fskb); | |
5ee68e5b JC |
199 | } |
200 | ||
bdcbd8e0 JB |
201 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
202 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); | |
5ee68e5b JC |
203 | |
204 | if (!copy) | |
205 | return; | |
206 | ||
207 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
208 | skb_queue_splice(&failq, &from_mpath->frame_queue); | |
209 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
210 | } | |
211 | ||
eb2b9311 | 212 | |
4a3cb702 JB |
213 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
214 | struct ieee80211_sub_if_data *sdata) | |
eb2b9311 LCC |
215 | { |
216 | struct mesh_path *mpath; | |
60854fd9 BC |
217 | |
218 | mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params); | |
219 | ||
220 | if (mpath && mpath_expired(mpath)) { | |
221 | spin_lock_bh(&mpath->state_lock); | |
222 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
223 | spin_unlock_bh(&mpath->state_lock); | |
eb2b9311 | 224 | } |
60854fd9 | 225 | return mpath; |
eb2b9311 LCC |
226 | } |
227 | ||
239289e4 JC |
228 | /** |
229 | * mesh_path_lookup - look up a path in the mesh path table | |
239289e4 | 230 | * @sdata: local subif |
bf7cd94d | 231 | * @dst: hardware address (ETH_ALEN length) of destination |
239289e4 JC |
232 | * |
233 | * Returns: pointer to the mesh path structure, or NULL if not found | |
234 | * | |
235 | * Locking: must be called within a read rcu section. | |
236 | */ | |
bf7cd94d JB |
237 | struct mesh_path * |
238 | mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
79617dee | 239 | { |
60854fd9 | 240 | return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata); |
239289e4 | 241 | } |
79617dee | 242 | |
bf7cd94d JB |
243 | struct mesh_path * |
244 | mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
239289e4 | 245 | { |
60854fd9 | 246 | return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata); |
79617dee Y |
247 | } |
248 | ||
60854fd9 BC |
249 | static struct mesh_path * |
250 | __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) | |
251 | { | |
252 | int i = 0, ret; | |
253 | struct mesh_path *mpath = NULL; | |
254 | struct rhashtable_iter iter; | |
255 | ||
256 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); | |
257 | if (ret) | |
258 | return NULL; | |
259 | ||
260 | ret = rhashtable_walk_start(&iter); | |
261 | if (ret && ret != -EAGAIN) | |
262 | goto err; | |
263 | ||
264 | while ((mpath = rhashtable_walk_next(&iter))) { | |
265 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
266 | continue; | |
267 | if (IS_ERR(mpath)) | |
268 | break; | |
269 | if (i++ == idx) | |
270 | break; | |
271 | } | |
272 | err: | |
273 | rhashtable_walk_stop(&iter); | |
274 | rhashtable_walk_exit(&iter); | |
275 | ||
276 | if (IS_ERR(mpath) || !mpath) | |
277 | return NULL; | |
278 | ||
279 | if (mpath_expired(mpath)) { | |
280 | spin_lock_bh(&mpath->state_lock); | |
281 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
282 | spin_unlock_bh(&mpath->state_lock); | |
283 | } | |
284 | return mpath; | |
285 | } | |
79617dee | 286 | |
eb2b9311 LCC |
287 | /** |
288 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index | |
289 | * @idx: index | |
f698d856 | 290 | * @sdata: local subif, or NULL for all entries |
eb2b9311 LCC |
291 | * |
292 | * Returns: pointer to the mesh path structure, or NULL if not found. | |
293 | * | |
294 | * Locking: must be called within a read rcu section. | |
295 | */ | |
bf7cd94d JB |
296 | struct mesh_path * |
297 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
eb2b9311 | 298 | { |
60854fd9 | 299 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx); |
eb2b9311 LCC |
300 | } |
301 | ||
a2db2ed3 HR |
302 | /** |
303 | * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index | |
304 | * @idx: index | |
305 | * @sdata: local subif, or NULL for all entries | |
306 | * | |
307 | * Returns: pointer to the proxy path structure, or NULL if not found. | |
308 | * | |
309 | * Locking: must be called within a read rcu section. | |
310 | */ | |
311 | struct mesh_path * | |
312 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
313 | { | |
60854fd9 | 314 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx); |
a2db2ed3 HR |
315 | } |
316 | ||
5ee68e5b | 317 | /** |
30be52e4 JB |
318 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
319 | * @mpath: gate path to add to table | |
5ee68e5b | 320 | */ |
30be52e4 | 321 | int mesh_path_add_gate(struct mesh_path *mpath) |
5ee68e5b | 322 | { |
30be52e4 | 323 | struct mesh_table *tbl; |
5ee68e5b JC |
324 | int err; |
325 | ||
326 | rcu_read_lock(); | |
60854fd9 | 327 | tbl = mpath->sdata->u.mesh.mesh_paths; |
5ee68e5b | 328 | |
947c2a0e BC |
329 | spin_lock_bh(&mpath->state_lock); |
330 | if (mpath->is_gate) { | |
331 | err = -EEXIST; | |
332 | spin_unlock_bh(&mpath->state_lock); | |
5ee68e5b JC |
333 | goto err_rcu; |
334 | } | |
5ee68e5b JC |
335 | mpath->is_gate = true; |
336 | mpath->sdata->u.mesh.num_gates++; | |
947c2a0e BC |
337 | |
338 | spin_lock(&tbl->gates_lock); | |
18b27ff7 | 339 | hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); |
947c2a0e BC |
340 | spin_unlock(&tbl->gates_lock); |
341 | ||
342 | spin_unlock_bh(&mpath->state_lock); | |
343 | ||
bdcbd8e0 JB |
344 | mpath_dbg(mpath->sdata, |
345 | "Mesh path: Recorded new gate: %pM. %d known gates\n", | |
346 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
bf7cd94d | 347 | err = 0; |
5ee68e5b JC |
348 | err_rcu: |
349 | rcu_read_unlock(); | |
350 | return err; | |
351 | } | |
352 | ||
353 | /** | |
354 | * mesh_gate_del - remove a mesh gate from the list of known gates | |
355 | * @tbl: table which holds our list of known gates | |
356 | * @mpath: gate mpath | |
5ee68e5b | 357 | */ |
bf7cd94d | 358 | static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
5ee68e5b | 359 | { |
947c2a0e BC |
360 | lockdep_assert_held(&mpath->state_lock); |
361 | if (!mpath->is_gate) | |
362 | return; | |
5ee68e5b | 363 | |
947c2a0e BC |
364 | mpath->is_gate = false; |
365 | spin_lock_bh(&tbl->gates_lock); | |
366 | hlist_del_rcu(&mpath->gate_list); | |
367 | mpath->sdata->u.mesh.num_gates--; | |
368 | spin_unlock_bh(&tbl->gates_lock); | |
369 | ||
370 | mpath_dbg(mpath->sdata, | |
371 | "Mesh path: Deleted gate: %pM. %d known gates\n", | |
372 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
5ee68e5b JC |
373 | } |
374 | ||
5ee68e5b JC |
375 | /** |
376 | * mesh_gate_num - number of gates known to this interface | |
377 | * @sdata: subif data | |
378 | */ | |
379 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) | |
380 | { | |
381 | return sdata->u.mesh.num_gates; | |
382 | } | |
383 | ||
b15dc38b BC |
384 | static |
385 | struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, | |
386 | const u8 *dst, gfp_t gfp_flags) | |
387 | { | |
388 | struct mesh_path *new_mpath; | |
389 | ||
390 | new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); | |
391 | if (!new_mpath) | |
392 | return NULL; | |
393 | ||
394 | memcpy(new_mpath->dst, dst, ETH_ALEN); | |
395 | eth_broadcast_addr(new_mpath->rann_snd_addr); | |
396 | new_mpath->is_root = false; | |
397 | new_mpath->sdata = sdata; | |
398 | new_mpath->flags = 0; | |
399 | skb_queue_head_init(&new_mpath->frame_queue); | |
b15dc38b BC |
400 | new_mpath->exp_time = jiffies; |
401 | spin_lock_init(&new_mpath->state_lock); | |
34f11cd3 | 402 | timer_setup(&new_mpath->timer, mesh_path_timer, 0); |
b15dc38b BC |
403 | |
404 | return new_mpath; | |
405 | } | |
406 | ||
eb2b9311 LCC |
407 | /** |
408 | * mesh_path_add - allocate and add a new path to the mesh path table | |
bf7cd94d | 409 | * @dst: destination address of the path (ETH_ALEN length) |
f698d856 | 410 | * @sdata: local subif |
eb2b9311 | 411 | * |
af901ca1 | 412 | * Returns: 0 on success |
eb2b9311 LCC |
413 | * |
414 | * State: the initial state of the new path is set to 0 | |
415 | */ | |
ae76eef0 BC |
416 | struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
417 | const u8 *dst) | |
eb2b9311 | 418 | { |
349eb8cf | 419 | struct mesh_table *tbl; |
eb2b9311 | 420 | struct mesh_path *mpath, *new_mpath; |
60854fd9 | 421 | int ret; |
eb2b9311 | 422 | |
b203ca39 | 423 | if (ether_addr_equal(dst, sdata->vif.addr)) |
eb2b9311 | 424 | /* never add ourselves as neighbours */ |
ae76eef0 | 425 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 LCC |
426 | |
427 | if (is_multicast_ether_addr(dst)) | |
ae76eef0 | 428 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 | 429 | |
472dbc45 | 430 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
ae76eef0 BC |
431 | return ERR_PTR(-ENOSPC); |
432 | ||
b15dc38b | 433 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
402d7752 | 434 | if (!new_mpath) |
60854fd9 | 435 | return ERR_PTR(-ENOMEM); |
18889231 | 436 | |
60854fd9 BC |
437 | tbl = sdata->u.mesh.mesh_paths; |
438 | do { | |
439 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, | |
440 | &new_mpath->rhash, | |
441 | mesh_rht_params); | |
18889231 | 442 | |
60854fd9 BC |
443 | if (ret == -EEXIST) |
444 | mpath = rhashtable_lookup_fast(&tbl->rhead, | |
445 | dst, | |
446 | mesh_rht_params); | |
1928ecab | 447 | |
60854fd9 | 448 | } while (unlikely(ret == -EEXIST && !mpath)); |
18889231 | 449 | |
60854fd9 BC |
450 | if (ret && ret != -EEXIST) |
451 | return ERR_PTR(ret); | |
18889231 | 452 | |
60854fd9 BC |
453 | /* At this point either new_mpath was added, or we found a |
454 | * matching entry already in the table; in the latter case | |
455 | * free the unnecessary new entry. | |
456 | */ | |
457 | if (ret == -EEXIST) { | |
458 | kfree(new_mpath); | |
459 | new_mpath = mpath; | |
18889231 | 460 | } |
60854fd9 BC |
461 | sdata->u.mesh.mesh_paths_generation++; |
462 | return new_mpath; | |
18889231 | 463 | } |
eb2b9311 | 464 | |
bf7cd94d JB |
465 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
466 | const u8 *dst, const u8 *mpp) | |
79617dee | 467 | { |
349eb8cf | 468 | struct mesh_table *tbl; |
60854fd9 BC |
469 | struct mesh_path *new_mpath; |
470 | int ret; | |
79617dee | 471 | |
b203ca39 | 472 | if (ether_addr_equal(dst, sdata->vif.addr)) |
79617dee Y |
473 | /* never add ourselves as neighbours */ |
474 | return -ENOTSUPP; | |
475 | ||
476 | if (is_multicast_ether_addr(dst)) | |
477 | return -ENOTSUPP; | |
478 | ||
b15dc38b | 479 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
79617dee | 480 | |
60854fd9 BC |
481 | if (!new_mpath) |
482 | return -ENOMEM; | |
79617dee | 483 | |
79617dee | 484 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
60854fd9 BC |
485 | tbl = sdata->u.mesh.mpp_paths; |
486 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, | |
487 | &new_mpath->rhash, | |
488 | mesh_rht_params); | |
a2db2ed3 | 489 | |
2bdaf386 | 490 | sdata->u.mesh.mpp_paths_generation++; |
60854fd9 | 491 | return ret; |
79617dee Y |
492 | } |
493 | ||
494 | ||
eb2b9311 LCC |
495 | /** |
496 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks | |
497 | * | |
498 | * @sta: broken peer link | |
499 | * | |
500 | * This function must be called from the rate control algorithm if enough | |
501 | * delivery errors suggest that a peer link is no longer usable. | |
502 | */ | |
503 | void mesh_plink_broken(struct sta_info *sta) | |
504 | { | |
60854fd9 BC |
505 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
506 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; | |
15ff6365 | 507 | static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
eb2b9311 | 508 | struct mesh_path *mpath; |
60854fd9 BC |
509 | struct rhashtable_iter iter; |
510 | int ret; | |
eb2b9311 | 511 | |
60854fd9 BC |
512 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
513 | if (ret) | |
514 | return; | |
515 | ||
516 | ret = rhashtable_walk_start(&iter); | |
517 | if (ret && ret != -EAGAIN) | |
518 | goto out; | |
519 | ||
520 | while ((mpath = rhashtable_walk_next(&iter))) { | |
521 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
522 | continue; | |
523 | if (IS_ERR(mpath)) | |
524 | break; | |
2688eba9 | 525 | if (rcu_access_pointer(mpath->next_hop) == sta && |
eb2b9311 LCC |
526 | mpath->flags & MESH_PATH_ACTIVE && |
527 | !(mpath->flags & MESH_PATH_FIXED)) { | |
f5e50cd0 | 528 | spin_lock_bh(&mpath->state_lock); |
eb2b9311 | 529 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 530 | ++mpath->sn; |
eb2b9311 | 531 | spin_unlock_bh(&mpath->state_lock); |
bf7cd94d | 532 | mesh_path_error_tx(sdata, |
f63f8421 CYY |
533 | sdata->u.mesh.mshcfg.element_ttl, |
534 | mpath->dst, mpath->sn, | |
535 | WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); | |
f5e50cd0 | 536 | } |
eb2b9311 | 537 | } |
60854fd9 BC |
538 | out: |
539 | rhashtable_walk_stop(&iter); | |
540 | rhashtable_walk_exit(&iter); | |
19c50b3d JC |
541 | } |
542 | ||
74932959 BC |
543 | static void mesh_path_free_rcu(struct mesh_table *tbl, |
544 | struct mesh_path *mpath) | |
19c50b3d | 545 | { |
60854fd9 | 546 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
c2e703a5 | 547 | |
947c2a0e | 548 | spin_lock_bh(&mpath->state_lock); |
74932959 | 549 | mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; |
60854fd9 | 550 | mesh_gate_del(tbl, mpath); |
947c2a0e | 551 | spin_unlock_bh(&mpath->state_lock); |
74932959 | 552 | del_timer_sync(&mpath->timer); |
c2e703a5 | 553 | atomic_dec(&sdata->u.mesh.mpaths); |
19c50b3d | 554 | atomic_dec(&tbl->entries); |
74932959 BC |
555 | kfree_rcu(mpath, rcu); |
556 | } | |
557 | ||
558 | static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) | |
559 | { | |
560 | rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); | |
561 | mesh_path_free_rcu(tbl, mpath); | |
19c50b3d JC |
562 | } |
563 | ||
eb2b9311 LCC |
564 | /** |
565 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches | |
566 | * | |
2c53040f | 567 | * @sta: mesh peer to match |
eb2b9311 | 568 | * |
b4e08ea1 LCC |
569 | * RCU notes: this function is called when a mesh plink transitions from |
570 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that | |
571 | * allows path creation. This will happen before the sta can be freed (because | |
d0709a65 JB |
572 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
573 | * protected against the plink disappearing. | |
eb2b9311 LCC |
574 | */ |
575 | void mesh_path_flush_by_nexthop(struct sta_info *sta) | |
576 | { | |
2bdaf386 | 577 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
60854fd9 | 578 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
eb2b9311 | 579 | struct mesh_path *mpath; |
60854fd9 BC |
580 | struct rhashtable_iter iter; |
581 | int ret; | |
eb2b9311 | 582 | |
60854fd9 BC |
583 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
584 | if (ret) | |
585 | return; | |
586 | ||
587 | ret = rhashtable_walk_start(&iter); | |
588 | if (ret && ret != -EAGAIN) | |
589 | goto out; | |
590 | ||
591 | while ((mpath = rhashtable_walk_next(&iter))) { | |
592 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
593 | continue; | |
594 | if (IS_ERR(mpath)) | |
595 | break; | |
596 | ||
597 | if (rcu_access_pointer(mpath->next_hop) == sta) | |
598 | __mesh_path_del(tbl, mpath); | |
eb2b9311 | 599 | } |
60854fd9 BC |
600 | out: |
601 | rhashtable_walk_stop(&iter); | |
602 | rhashtable_walk_exit(&iter); | |
eb2b9311 LCC |
603 | } |
604 | ||
bf5a70e1 HR |
605 | static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
606 | const u8 *proxy) | |
607 | { | |
60854fd9 BC |
608 | struct mesh_table *tbl = sdata->u.mesh.mpp_paths; |
609 | struct mesh_path *mpath; | |
610 | struct rhashtable_iter iter; | |
611 | int ret; | |
bf5a70e1 | 612 | |
60854fd9 BC |
613 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
614 | if (ret) | |
615 | return; | |
616 | ||
617 | ret = rhashtable_walk_start(&iter); | |
618 | if (ret && ret != -EAGAIN) | |
619 | goto out; | |
620 | ||
621 | while ((mpath = rhashtable_walk_next(&iter))) { | |
622 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
623 | continue; | |
624 | if (IS_ERR(mpath)) | |
625 | break; | |
626 | ||
627 | if (ether_addr_equal(mpath->mpp, proxy)) | |
628 | __mesh_path_del(tbl, mpath); | |
bf5a70e1 | 629 | } |
60854fd9 BC |
630 | out: |
631 | rhashtable_walk_stop(&iter); | |
632 | rhashtable_walk_exit(&iter); | |
bf5a70e1 HR |
633 | } |
634 | ||
60854fd9 | 635 | static void table_flush_by_iface(struct mesh_table *tbl) |
eb2b9311 LCC |
636 | { |
637 | struct mesh_path *mpath; | |
60854fd9 BC |
638 | struct rhashtable_iter iter; |
639 | int ret; | |
640 | ||
641 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); | |
642 | if (ret) | |
643 | return; | |
644 | ||
645 | ret = rhashtable_walk_start(&iter); | |
646 | if (ret && ret != -EAGAIN) | |
647 | goto out; | |
648 | ||
649 | while ((mpath = rhashtable_walk_next(&iter))) { | |
650 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
651 | continue; | |
652 | if (IS_ERR(mpath)) | |
653 | break; | |
654 | __mesh_path_del(tbl, mpath); | |
eb2b9311 | 655 | } |
60854fd9 BC |
656 | out: |
657 | rhashtable_walk_stop(&iter); | |
658 | rhashtable_walk_exit(&iter); | |
eb2b9311 LCC |
659 | } |
660 | ||
ece1a2e7 JC |
661 | /** |
662 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface | |
663 | * | |
664 | * This function deletes both mesh paths as well as mesh portal paths. | |
665 | * | |
2c53040f | 666 | * @sdata: interface data to match |
ece1a2e7 JC |
667 | * |
668 | */ | |
669 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) | |
eb2b9311 | 670 | { |
60854fd9 BC |
671 | table_flush_by_iface(sdata->u.mesh.mesh_paths); |
672 | table_flush_by_iface(sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
673 | } |
674 | ||
675 | /** | |
4cc955de | 676 | * table_path_del - delete a path from the mesh or mpp table |
eb2b9311 | 677 | * |
4cc955de | 678 | * @tbl: mesh or mpp path table |
f698d856 | 679 | * @sdata: local subif |
4cc955de | 680 | * @addr: dst address (ETH_ALEN length) |
eb2b9311 | 681 | * |
af901ca1 | 682 | * Returns: 0 if successful |
eb2b9311 | 683 | */ |
60854fd9 | 684 | static int table_path_del(struct mesh_table *tbl, |
4cc955de HR |
685 | struct ieee80211_sub_if_data *sdata, |
686 | const u8 *addr) | |
eb2b9311 LCC |
687 | { |
688 | struct mesh_path *mpath; | |
60854fd9 BC |
689 | |
690 | rcu_read_lock(); | |
691 | mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); | |
692 | if (!mpath) { | |
693 | rcu_read_unlock(); | |
694 | return -ENXIO; | |
eb2b9311 LCC |
695 | } |
696 | ||
60854fd9 BC |
697 | __mesh_path_del(tbl, mpath); |
698 | rcu_read_unlock(); | |
699 | return 0; | |
4cc955de HR |
700 | } |
701 | ||
60854fd9 | 702 | |
4cc955de HR |
703 | /** |
704 | * mesh_path_del - delete a mesh path from the table | |
705 | * | |
706 | * @addr: dst address (ETH_ALEN length) | |
707 | * @sdata: local subif | |
708 | * | |
709 | * Returns: 0 if successful | |
710 | */ | |
711 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) | |
712 | { | |
60854fd9 | 713 | int err; |
4cc955de HR |
714 | |
715 | /* flush relevant mpp entries first */ | |
716 | mpp_flush_by_proxy(sdata, addr); | |
717 | ||
2bdaf386 BC |
718 | err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr); |
719 | sdata->u.mesh.mesh_paths_generation++; | |
ab1c7906 HR |
720 | return err; |
721 | } | |
722 | ||
eb2b9311 LCC |
723 | /** |
724 | * mesh_path_tx_pending - sends pending frames in a mesh path queue | |
725 | * | |
726 | * @mpath: mesh path to activate | |
727 | * | |
728 | * Locking: the state_lock of the mpath structure must NOT be held when calling | |
729 | * this function. | |
730 | */ | |
731 | void mesh_path_tx_pending(struct mesh_path *mpath) | |
732 | { | |
249b405c JC |
733 | if (mpath->flags & MESH_PATH_ACTIVE) |
734 | ieee80211_add_pending_skbs(mpath->sdata->local, | |
735 | &mpath->frame_queue); | |
eb2b9311 LCC |
736 | } |
737 | ||
5ee68e5b JC |
738 | /** |
739 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates | |
740 | * | |
741 | * @mpath: mesh path whose queue will be emptied | |
742 | * | |
743 | * If there is only one gate, the frames are transferred from the failed mpath | |
744 | * queue to that gate's queue. If there are more than one gates, the frames | |
745 | * are copied from each gate to the next. After frames are copied, the | |
746 | * mpath queues are emptied onto the transmission queue. | |
747 | */ | |
748 | int mesh_path_send_to_gates(struct mesh_path *mpath) | |
749 | { | |
750 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b JC |
751 | struct mesh_table *tbl; |
752 | struct mesh_path *from_mpath = mpath; | |
60854fd9 | 753 | struct mesh_path *gate; |
5ee68e5b | 754 | bool copy = false; |
5ee68e5b | 755 | |
60854fd9 | 756 | tbl = sdata->u.mesh.mesh_paths; |
5ee68e5b | 757 | |
60854fd9 | 758 | rcu_read_lock(); |
18b27ff7 | 759 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
760 | if (gate->flags & MESH_PATH_ACTIVE) { |
761 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); | |
762 | mesh_path_move_to_queue(gate, from_mpath, copy); | |
763 | from_mpath = gate; | |
5ee68e5b JC |
764 | copy = true; |
765 | } else { | |
bdcbd8e0 | 766 | mpath_dbg(sdata, |
d671b2a0 | 767 | "Not forwarding to %pM (flags %#x)\n", |
947c2a0e | 768 | gate->dst, gate->flags); |
5ee68e5b JC |
769 | } |
770 | } | |
771 | ||
18b27ff7 | 772 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
773 | mpath_dbg(sdata, "Sending to %pM\n", gate->dst); |
774 | mesh_path_tx_pending(gate); | |
2bdaf386 | 775 | } |
60854fd9 | 776 | rcu_read_unlock(); |
5ee68e5b JC |
777 | |
778 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; | |
779 | } | |
780 | ||
eb2b9311 LCC |
781 | /** |
782 | * mesh_path_discard_frame - discard a frame whose path could not be resolved | |
783 | * | |
784 | * @skb: frame to discard | |
f698d856 | 785 | * @sdata: network subif the frame was to be sent through |
eb2b9311 | 786 | * |
eb2b9311 LCC |
787 | * Locking: the function must me called within a rcu_read_lock region |
788 | */ | |
bf7cd94d JB |
789 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
790 | struct sk_buff *skb) | |
eb2b9311 | 791 | { |
eb2b9311 | 792 | kfree_skb(skb); |
472dbc45 | 793 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
eb2b9311 LCC |
794 | } |
795 | ||
796 | /** | |
797 | * mesh_path_flush_pending - free the pending queue of a mesh path | |
798 | * | |
799 | * @mpath: mesh path whose queue has to be freed | |
800 | * | |
25985edc | 801 | * Locking: the function must me called within a rcu_read_lock region |
eb2b9311 LCC |
802 | */ |
803 | void mesh_path_flush_pending(struct mesh_path *mpath) | |
804 | { | |
eb2b9311 LCC |
805 | struct sk_buff *skb; |
806 | ||
00e3f25c | 807 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
bf7cd94d | 808 | mesh_path_discard_frame(mpath->sdata, skb); |
eb2b9311 LCC |
809 | } |
810 | ||
811 | /** | |
812 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path | |
813 | * | |
814 | * @mpath: the mesh path to modify | |
815 | * @next_hop: the next hop to force | |
816 | * | |
817 | * Locking: this function must be called holding mpath->state_lock | |
818 | */ | |
819 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) | |
820 | { | |
821 | spin_lock_bh(&mpath->state_lock); | |
822 | mesh_path_assign_nexthop(mpath, next_hop); | |
d19b3bf6 | 823 | mpath->sn = 0xffff; |
eb2b9311 LCC |
824 | mpath->metric = 0; |
825 | mpath->hop_count = 0; | |
826 | mpath->exp_time = 0; | |
5df20f21 | 827 | mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; |
eb2b9311 LCC |
828 | mesh_path_activate(mpath); |
829 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
830 | ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); |
831 | /* init it at a low value - 0 start is tricky */ | |
832 | ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); | |
eb2b9311 LCC |
833 | mesh_path_tx_pending(mpath); |
834 | } | |
835 | ||
2bdaf386 | 836 | int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 837 | { |
349eb8cf | 838 | struct mesh_table *tbl_path, *tbl_mpp; |
4c5ade41 | 839 | int ret; |
349eb8cf | 840 | |
60854fd9 | 841 | tbl_path = mesh_table_alloc(); |
349eb8cf | 842 | if (!tbl_path) |
79617dee | 843 | return -ENOMEM; |
5ee68e5b | 844 | |
60854fd9 | 845 | tbl_mpp = mesh_table_alloc(); |
349eb8cf | 846 | if (!tbl_mpp) { |
4c5ade41 DC |
847 | ret = -ENOMEM; |
848 | goto free_path; | |
79617dee | 849 | } |
349eb8cf | 850 | |
60854fd9 BC |
851 | rhashtable_init(&tbl_path->rhead, &mesh_rht_params); |
852 | rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params); | |
2bdaf386 | 853 | |
60854fd9 BC |
854 | sdata->u.mesh.mesh_paths = tbl_path; |
855 | sdata->u.mesh.mpp_paths = tbl_mpp; | |
79617dee | 856 | |
eb2b9311 | 857 | return 0; |
4c5ade41 | 858 | |
4c5ade41 | 859 | free_path: |
60854fd9 | 860 | mesh_table_free(tbl_path); |
4c5ade41 | 861 | return ret; |
eb2b9311 LCC |
862 | } |
863 | ||
60854fd9 BC |
864 | static |
865 | void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, | |
866 | struct mesh_table *tbl) | |
eb2b9311 LCC |
867 | { |
868 | struct mesh_path *mpath; | |
60854fd9 BC |
869 | struct rhashtable_iter iter; |
870 | int ret; | |
eb2b9311 | 871 | |
60854fd9 BC |
872 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_KERNEL); |
873 | if (ret) | |
874 | return; | |
875 | ||
876 | ret = rhashtable_walk_start(&iter); | |
877 | if (ret && ret != -EAGAIN) | |
878 | goto out; | |
879 | ||
880 | while ((mpath = rhashtable_walk_next(&iter))) { | |
881 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) | |
882 | continue; | |
883 | if (IS_ERR(mpath)) | |
884 | break; | |
eb2b9311 LCC |
885 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
886 | (!(mpath->flags & MESH_PATH_FIXED)) && | |
f5e50cd0 | 887 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
60854fd9 | 888 | __mesh_path_del(tbl, mpath); |
ab1c7906 | 889 | } |
60854fd9 BC |
890 | out: |
891 | rhashtable_walk_stop(&iter); | |
892 | rhashtable_walk_exit(&iter); | |
893 | } | |
ab1c7906 | 894 | |
60854fd9 BC |
895 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
896 | { | |
897 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths); | |
898 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
899 | } |
900 | ||
2bdaf386 | 901 | void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 902 | { |
60854fd9 BC |
903 | mesh_table_free(sdata->u.mesh.mesh_paths); |
904 | mesh_table_free(sdata->u.mesh.mpp_paths); | |
eb2b9311 | 905 | } |