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Commit | Line | Data |
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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); |
b4c3fbe6 | 62 | INIT_HLIST_HEAD(&newtbl->walk_head); |
6b86bd62 | 63 | atomic_set(&newtbl->entries, 0); |
5ee68e5b | 64 | spin_lock_init(&newtbl->gates_lock); |
b4c3fbe6 | 65 | spin_lock_init(&newtbl->walk_lock); |
6b86bd62 JB |
66 | |
67 | return newtbl; | |
68 | } | |
69 | ||
60854fd9 | 70 | static void mesh_table_free(struct mesh_table *tbl) |
18889231 | 71 | { |
60854fd9 | 72 | rhashtable_free_and_destroy(&tbl->rhead, |
74932959 | 73 | mesh_path_rht_free, tbl); |
18889231 JC |
74 | kfree(tbl); |
75 | } | |
76 | ||
eb2b9311 LCC |
77 | /** |
78 | * | |
79 | * mesh_path_assign_nexthop - update mesh path next hop | |
80 | * | |
81 | * @mpath: mesh path to update | |
82 | * @sta: next hop to assign | |
83 | * | |
84 | * Locking: mpath->state_lock must be held when calling this function | |
85 | */ | |
86 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) | |
87 | { | |
10c836d7 JC |
88 | struct sk_buff *skb; |
89 | struct ieee80211_hdr *hdr; | |
10c836d7 JC |
90 | unsigned long flags; |
91 | ||
d0709a65 | 92 | rcu_assign_pointer(mpath->next_hop, sta); |
10c836d7 | 93 | |
10c836d7 | 94 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
b22bd522 | 95 | skb_queue_walk(&mpath->frame_queue, skb) { |
10c836d7 JC |
96 | hdr = (struct ieee80211_hdr *) skb->data; |
97 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); | |
7e3c8866 | 98 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
3f52b7e3 | 99 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
10c836d7 JC |
100 | } |
101 | ||
10c836d7 | 102 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
eb2b9311 LCC |
103 | } |
104 | ||
5ee68e5b JC |
105 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
106 | struct mesh_path *gate_mpath) | |
107 | { | |
108 | struct ieee80211_hdr *hdr; | |
109 | struct ieee80211s_hdr *mshdr; | |
110 | int mesh_hdrlen, hdrlen; | |
111 | char *next_hop; | |
112 | ||
113 | hdr = (struct ieee80211_hdr *) skb->data; | |
114 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
115 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
116 | ||
117 | if (!(mshdr->flags & MESH_FLAGS_AE)) { | |
118 | /* size of the fixed part of the mesh header */ | |
119 | mesh_hdrlen = 6; | |
120 | ||
121 | /* make room for the two extended addresses */ | |
122 | skb_push(skb, 2 * ETH_ALEN); | |
123 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); | |
124 | ||
125 | hdr = (struct ieee80211_hdr *) skb->data; | |
126 | ||
127 | /* we preserve the previous mesh header and only add | |
128 | * the new addreses */ | |
129 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
130 | mshdr->flags = MESH_FLAGS_AE_A5_A6; | |
131 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); | |
132 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); | |
133 | } | |
134 | ||
135 | /* update next hop */ | |
136 | hdr = (struct ieee80211_hdr *) skb->data; | |
137 | rcu_read_lock(); | |
138 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; | |
139 | memcpy(hdr->addr1, next_hop, ETH_ALEN); | |
140 | rcu_read_unlock(); | |
7e3c8866 | 141 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
5ee68e5b JC |
142 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
143 | } | |
144 | ||
145 | /** | |
146 | * | |
147 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another | |
148 | * | |
149 | * This function is used to transfer or copy frames from an unresolved mpath to | |
150 | * a gate mpath. The function also adds the Address Extension field and | |
151 | * updates the next hop. | |
152 | * | |
153 | * If a frame already has an Address Extension field, only the next hop and | |
154 | * destination addresses are updated. | |
155 | * | |
156 | * The gate mpath must be an active mpath with a valid mpath->next_hop. | |
157 | * | |
158 | * @mpath: An active mpath the frames will be sent to (i.e. the gate) | |
159 | * @from_mpath: The failed mpath | |
160 | * @copy: When true, copy all the frames to the new mpath queue. When false, | |
161 | * move them. | |
162 | */ | |
163 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, | |
164 | struct mesh_path *from_mpath, | |
165 | bool copy) | |
166 | { | |
4bd4c2dd TP |
167 | struct sk_buff *skb, *fskb, *tmp; |
168 | struct sk_buff_head failq; | |
5ee68e5b | 169 | unsigned long flags; |
5ee68e5b | 170 | |
8c5bb1fa JB |
171 | if (WARN_ON(gate_mpath == from_mpath)) |
172 | return; | |
173 | if (WARN_ON(!gate_mpath->next_hop)) | |
174 | return; | |
5ee68e5b | 175 | |
5ee68e5b JC |
176 | __skb_queue_head_init(&failq); |
177 | ||
178 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
179 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); | |
180 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
181 | ||
4bd4c2dd TP |
182 | skb_queue_walk_safe(&failq, fskb, tmp) { |
183 | if (skb_queue_len(&gate_mpath->frame_queue) >= | |
184 | MESH_FRAME_QUEUE_LEN) { | |
185 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); | |
186 | break; | |
817a53d9 | 187 | } |
5ee68e5b | 188 | |
4bd4c2dd TP |
189 | skb = skb_copy(fskb, GFP_ATOMIC); |
190 | if (WARN_ON(!skb)) | |
191 | break; | |
192 | ||
5ee68e5b | 193 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
4bd4c2dd TP |
194 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
195 | ||
196 | if (copy) | |
197 | continue; | |
198 | ||
199 | __skb_unlink(fskb, &failq); | |
200 | kfree_skb(fskb); | |
5ee68e5b JC |
201 | } |
202 | ||
bdcbd8e0 JB |
203 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
204 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); | |
5ee68e5b JC |
205 | |
206 | if (!copy) | |
207 | return; | |
208 | ||
209 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
210 | skb_queue_splice(&failq, &from_mpath->frame_queue); | |
211 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
212 | } | |
213 | ||
eb2b9311 | 214 | |
4a3cb702 JB |
215 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
216 | struct ieee80211_sub_if_data *sdata) | |
eb2b9311 LCC |
217 | { |
218 | struct mesh_path *mpath; | |
60854fd9 BC |
219 | |
220 | mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params); | |
221 | ||
222 | if (mpath && mpath_expired(mpath)) { | |
223 | spin_lock_bh(&mpath->state_lock); | |
224 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
225 | spin_unlock_bh(&mpath->state_lock); | |
eb2b9311 | 226 | } |
60854fd9 | 227 | return mpath; |
eb2b9311 LCC |
228 | } |
229 | ||
239289e4 JC |
230 | /** |
231 | * mesh_path_lookup - look up a path in the mesh path table | |
239289e4 | 232 | * @sdata: local subif |
bf7cd94d | 233 | * @dst: hardware address (ETH_ALEN length) of destination |
239289e4 JC |
234 | * |
235 | * Returns: pointer to the mesh path structure, or NULL if not found | |
236 | * | |
237 | * Locking: must be called within a read rcu section. | |
238 | */ | |
bf7cd94d JB |
239 | struct mesh_path * |
240 | mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
79617dee | 241 | { |
60854fd9 | 242 | return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata); |
239289e4 | 243 | } |
79617dee | 244 | |
bf7cd94d JB |
245 | struct mesh_path * |
246 | mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
239289e4 | 247 | { |
60854fd9 | 248 | return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata); |
79617dee Y |
249 | } |
250 | ||
60854fd9 BC |
251 | static struct mesh_path * |
252 | __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) | |
253 | { | |
b4c3fbe6 HX |
254 | int i = 0; |
255 | struct mesh_path *mpath; | |
60854fd9 | 256 | |
b4c3fbe6 | 257 | hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { |
60854fd9 BC |
258 | if (i++ == idx) |
259 | break; | |
260 | } | |
60854fd9 | 261 | |
b4c3fbe6 | 262 | if (!mpath) |
60854fd9 BC |
263 | return NULL; |
264 | ||
265 | if (mpath_expired(mpath)) { | |
266 | spin_lock_bh(&mpath->state_lock); | |
267 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
268 | spin_unlock_bh(&mpath->state_lock); | |
269 | } | |
270 | return mpath; | |
271 | } | |
79617dee | 272 | |
eb2b9311 LCC |
273 | /** |
274 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index | |
275 | * @idx: index | |
f698d856 | 276 | * @sdata: local subif, or NULL for all entries |
eb2b9311 LCC |
277 | * |
278 | * Returns: pointer to the mesh path structure, or NULL if not found. | |
279 | * | |
280 | * Locking: must be called within a read rcu section. | |
281 | */ | |
bf7cd94d JB |
282 | struct mesh_path * |
283 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
eb2b9311 | 284 | { |
60854fd9 | 285 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx); |
eb2b9311 LCC |
286 | } |
287 | ||
a2db2ed3 HR |
288 | /** |
289 | * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index | |
290 | * @idx: index | |
291 | * @sdata: local subif, or NULL for all entries | |
292 | * | |
293 | * Returns: pointer to the proxy path structure, or NULL if not found. | |
294 | * | |
295 | * Locking: must be called within a read rcu section. | |
296 | */ | |
297 | struct mesh_path * | |
298 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
299 | { | |
60854fd9 | 300 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx); |
a2db2ed3 HR |
301 | } |
302 | ||
5ee68e5b | 303 | /** |
30be52e4 JB |
304 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
305 | * @mpath: gate path to add to table | |
5ee68e5b | 306 | */ |
30be52e4 | 307 | int mesh_path_add_gate(struct mesh_path *mpath) |
5ee68e5b | 308 | { |
30be52e4 | 309 | struct mesh_table *tbl; |
5ee68e5b JC |
310 | int err; |
311 | ||
312 | rcu_read_lock(); | |
60854fd9 | 313 | tbl = mpath->sdata->u.mesh.mesh_paths; |
5ee68e5b | 314 | |
947c2a0e BC |
315 | spin_lock_bh(&mpath->state_lock); |
316 | if (mpath->is_gate) { | |
317 | err = -EEXIST; | |
318 | spin_unlock_bh(&mpath->state_lock); | |
5ee68e5b JC |
319 | goto err_rcu; |
320 | } | |
5ee68e5b JC |
321 | mpath->is_gate = true; |
322 | mpath->sdata->u.mesh.num_gates++; | |
947c2a0e BC |
323 | |
324 | spin_lock(&tbl->gates_lock); | |
18b27ff7 | 325 | hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); |
947c2a0e BC |
326 | spin_unlock(&tbl->gates_lock); |
327 | ||
328 | spin_unlock_bh(&mpath->state_lock); | |
329 | ||
bdcbd8e0 JB |
330 | mpath_dbg(mpath->sdata, |
331 | "Mesh path: Recorded new gate: %pM. %d known gates\n", | |
332 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
bf7cd94d | 333 | err = 0; |
5ee68e5b JC |
334 | err_rcu: |
335 | rcu_read_unlock(); | |
336 | return err; | |
337 | } | |
338 | ||
339 | /** | |
340 | * mesh_gate_del - remove a mesh gate from the list of known gates | |
341 | * @tbl: table which holds our list of known gates | |
342 | * @mpath: gate mpath | |
5ee68e5b | 343 | */ |
bf7cd94d | 344 | static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
5ee68e5b | 345 | { |
947c2a0e BC |
346 | lockdep_assert_held(&mpath->state_lock); |
347 | if (!mpath->is_gate) | |
348 | return; | |
5ee68e5b | 349 | |
947c2a0e BC |
350 | mpath->is_gate = false; |
351 | spin_lock_bh(&tbl->gates_lock); | |
352 | hlist_del_rcu(&mpath->gate_list); | |
353 | mpath->sdata->u.mesh.num_gates--; | |
354 | spin_unlock_bh(&tbl->gates_lock); | |
355 | ||
356 | mpath_dbg(mpath->sdata, | |
357 | "Mesh path: Deleted gate: %pM. %d known gates\n", | |
358 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
5ee68e5b JC |
359 | } |
360 | ||
5ee68e5b JC |
361 | /** |
362 | * mesh_gate_num - number of gates known to this interface | |
363 | * @sdata: subif data | |
364 | */ | |
365 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) | |
366 | { | |
367 | return sdata->u.mesh.num_gates; | |
368 | } | |
369 | ||
b15dc38b BC |
370 | static |
371 | struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, | |
372 | const u8 *dst, gfp_t gfp_flags) | |
373 | { | |
374 | struct mesh_path *new_mpath; | |
375 | ||
376 | new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); | |
377 | if (!new_mpath) | |
378 | return NULL; | |
379 | ||
380 | memcpy(new_mpath->dst, dst, ETH_ALEN); | |
381 | eth_broadcast_addr(new_mpath->rann_snd_addr); | |
382 | new_mpath->is_root = false; | |
383 | new_mpath->sdata = sdata; | |
384 | new_mpath->flags = 0; | |
385 | skb_queue_head_init(&new_mpath->frame_queue); | |
b15dc38b BC |
386 | new_mpath->exp_time = jiffies; |
387 | spin_lock_init(&new_mpath->state_lock); | |
34f11cd3 | 388 | timer_setup(&new_mpath->timer, mesh_path_timer, 0); |
b15dc38b BC |
389 | |
390 | return new_mpath; | |
391 | } | |
392 | ||
eb2b9311 LCC |
393 | /** |
394 | * mesh_path_add - allocate and add a new path to the mesh path table | |
bf7cd94d | 395 | * @dst: destination address of the path (ETH_ALEN length) |
f698d856 | 396 | * @sdata: local subif |
eb2b9311 | 397 | * |
af901ca1 | 398 | * Returns: 0 on success |
eb2b9311 LCC |
399 | * |
400 | * State: the initial state of the new path is set to 0 | |
401 | */ | |
ae76eef0 BC |
402 | struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
403 | const u8 *dst) | |
eb2b9311 | 404 | { |
349eb8cf | 405 | struct mesh_table *tbl; |
eb2b9311 | 406 | struct mesh_path *mpath, *new_mpath; |
eb2b9311 | 407 | |
b203ca39 | 408 | if (ether_addr_equal(dst, sdata->vif.addr)) |
eb2b9311 | 409 | /* never add ourselves as neighbours */ |
ae76eef0 | 410 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 LCC |
411 | |
412 | if (is_multicast_ether_addr(dst)) | |
ae76eef0 | 413 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 | 414 | |
472dbc45 | 415 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
ae76eef0 BC |
416 | return ERR_PTR(-ENOSPC); |
417 | ||
b15dc38b | 418 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
402d7752 | 419 | if (!new_mpath) |
60854fd9 | 420 | return ERR_PTR(-ENOMEM); |
18889231 | 421 | |
60854fd9 | 422 | tbl = sdata->u.mesh.mesh_paths; |
b4c3fbe6 | 423 | spin_lock_bh(&tbl->walk_lock); |
36922931 HX |
424 | mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead, |
425 | &new_mpath->rhash, | |
426 | mesh_rht_params); | |
427 | if (!mpath) | |
428 | hlist_add_head(&new_mpath->walk_list, &tbl->walk_head); | |
b4c3fbe6 | 429 | spin_unlock_bh(&tbl->walk_lock); |
18889231 | 430 | |
36922931 | 431 | if (mpath) { |
60854fd9 | 432 | kfree(new_mpath); |
4ff3a9d1 | 433 | |
36922931 HX |
434 | if (IS_ERR(mpath)) |
435 | return mpath; | |
4ff3a9d1 | 436 | |
60854fd9 | 437 | new_mpath = mpath; |
18889231 | 438 | } |
4ff3a9d1 | 439 | |
60854fd9 BC |
440 | sdata->u.mesh.mesh_paths_generation++; |
441 | return new_mpath; | |
18889231 | 442 | } |
eb2b9311 | 443 | |
bf7cd94d JB |
444 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
445 | const u8 *dst, const u8 *mpp) | |
79617dee | 446 | { |
349eb8cf | 447 | struct mesh_table *tbl; |
60854fd9 BC |
448 | struct mesh_path *new_mpath; |
449 | int ret; | |
79617dee | 450 | |
b203ca39 | 451 | if (ether_addr_equal(dst, sdata->vif.addr)) |
79617dee Y |
452 | /* never add ourselves as neighbours */ |
453 | return -ENOTSUPP; | |
454 | ||
455 | if (is_multicast_ether_addr(dst)) | |
456 | return -ENOTSUPP; | |
457 | ||
b15dc38b | 458 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
79617dee | 459 | |
60854fd9 BC |
460 | if (!new_mpath) |
461 | return -ENOMEM; | |
79617dee | 462 | |
79617dee | 463 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
60854fd9 | 464 | tbl = sdata->u.mesh.mpp_paths; |
b4c3fbe6 HX |
465 | |
466 | spin_lock_bh(&tbl->walk_lock); | |
60854fd9 BC |
467 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, |
468 | &new_mpath->rhash, | |
469 | mesh_rht_params); | |
b4c3fbe6 HX |
470 | if (!ret) |
471 | hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head); | |
472 | spin_unlock_bh(&tbl->walk_lock); | |
a2db2ed3 | 473 | |
4ff3a9d1 HX |
474 | if (ret) |
475 | kfree(new_mpath); | |
476 | ||
2bdaf386 | 477 | sdata->u.mesh.mpp_paths_generation++; |
60854fd9 | 478 | return ret; |
79617dee Y |
479 | } |
480 | ||
481 | ||
eb2b9311 LCC |
482 | /** |
483 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks | |
484 | * | |
485 | * @sta: broken peer link | |
486 | * | |
487 | * This function must be called from the rate control algorithm if enough | |
488 | * delivery errors suggest that a peer link is no longer usable. | |
489 | */ | |
490 | void mesh_plink_broken(struct sta_info *sta) | |
491 | { | |
60854fd9 BC |
492 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
493 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; | |
15ff6365 | 494 | static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
eb2b9311 | 495 | struct mesh_path *mpath; |
60854fd9 | 496 | |
b4c3fbe6 HX |
497 | rcu_read_lock(); |
498 | hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { | |
2688eba9 | 499 | if (rcu_access_pointer(mpath->next_hop) == sta && |
eb2b9311 LCC |
500 | mpath->flags & MESH_PATH_ACTIVE && |
501 | !(mpath->flags & MESH_PATH_FIXED)) { | |
f5e50cd0 | 502 | spin_lock_bh(&mpath->state_lock); |
eb2b9311 | 503 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 504 | ++mpath->sn; |
eb2b9311 | 505 | spin_unlock_bh(&mpath->state_lock); |
bf7cd94d | 506 | mesh_path_error_tx(sdata, |
f63f8421 CYY |
507 | sdata->u.mesh.mshcfg.element_ttl, |
508 | mpath->dst, mpath->sn, | |
509 | WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); | |
f5e50cd0 | 510 | } |
eb2b9311 | 511 | } |
b4c3fbe6 | 512 | rcu_read_unlock(); |
19c50b3d JC |
513 | } |
514 | ||
74932959 BC |
515 | static void mesh_path_free_rcu(struct mesh_table *tbl, |
516 | struct mesh_path *mpath) | |
19c50b3d | 517 | { |
60854fd9 | 518 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
c2e703a5 | 519 | |
947c2a0e | 520 | spin_lock_bh(&mpath->state_lock); |
74932959 | 521 | mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; |
60854fd9 | 522 | mesh_gate_del(tbl, mpath); |
947c2a0e | 523 | spin_unlock_bh(&mpath->state_lock); |
74932959 | 524 | del_timer_sync(&mpath->timer); |
c2e703a5 | 525 | atomic_dec(&sdata->u.mesh.mpaths); |
19c50b3d | 526 | atomic_dec(&tbl->entries); |
74932959 BC |
527 | kfree_rcu(mpath, rcu); |
528 | } | |
529 | ||
530 | static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) | |
531 | { | |
b4c3fbe6 | 532 | hlist_del_rcu(&mpath->walk_list); |
74932959 BC |
533 | rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); |
534 | mesh_path_free_rcu(tbl, mpath); | |
19c50b3d JC |
535 | } |
536 | ||
eb2b9311 LCC |
537 | /** |
538 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches | |
539 | * | |
2c53040f | 540 | * @sta: mesh peer to match |
eb2b9311 | 541 | * |
b4e08ea1 LCC |
542 | * RCU notes: this function is called when a mesh plink transitions from |
543 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that | |
544 | * allows path creation. This will happen before the sta can be freed (because | |
d0709a65 JB |
545 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
546 | * protected against the plink disappearing. | |
eb2b9311 LCC |
547 | */ |
548 | void mesh_path_flush_by_nexthop(struct sta_info *sta) | |
549 | { | |
2bdaf386 | 550 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
60854fd9 | 551 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
eb2b9311 | 552 | struct mesh_path *mpath; |
b4c3fbe6 | 553 | struct hlist_node *n; |
60854fd9 | 554 | |
b4c3fbe6 HX |
555 | spin_lock_bh(&tbl->walk_lock); |
556 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 BC |
557 | if (rcu_access_pointer(mpath->next_hop) == sta) |
558 | __mesh_path_del(tbl, mpath); | |
eb2b9311 | 559 | } |
b4c3fbe6 | 560 | spin_unlock_bh(&tbl->walk_lock); |
eb2b9311 LCC |
561 | } |
562 | ||
bf5a70e1 HR |
563 | static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
564 | const u8 *proxy) | |
565 | { | |
60854fd9 BC |
566 | struct mesh_table *tbl = sdata->u.mesh.mpp_paths; |
567 | struct mesh_path *mpath; | |
b4c3fbe6 | 568 | struct hlist_node *n; |
60854fd9 | 569 | |
b4c3fbe6 HX |
570 | spin_lock_bh(&tbl->walk_lock); |
571 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 BC |
572 | if (ether_addr_equal(mpath->mpp, proxy)) |
573 | __mesh_path_del(tbl, mpath); | |
bf5a70e1 | 574 | } |
b4c3fbe6 | 575 | spin_unlock_bh(&tbl->walk_lock); |
bf5a70e1 HR |
576 | } |
577 | ||
60854fd9 | 578 | static void table_flush_by_iface(struct mesh_table *tbl) |
eb2b9311 LCC |
579 | { |
580 | struct mesh_path *mpath; | |
b4c3fbe6 | 581 | struct hlist_node *n; |
60854fd9 | 582 | |
b4c3fbe6 HX |
583 | spin_lock_bh(&tbl->walk_lock); |
584 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 | 585 | __mesh_path_del(tbl, mpath); |
eb2b9311 | 586 | } |
b4c3fbe6 | 587 | spin_unlock_bh(&tbl->walk_lock); |
eb2b9311 LCC |
588 | } |
589 | ||
ece1a2e7 JC |
590 | /** |
591 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface | |
592 | * | |
593 | * This function deletes both mesh paths as well as mesh portal paths. | |
594 | * | |
2c53040f | 595 | * @sdata: interface data to match |
ece1a2e7 JC |
596 | * |
597 | */ | |
598 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) | |
eb2b9311 | 599 | { |
60854fd9 BC |
600 | table_flush_by_iface(sdata->u.mesh.mesh_paths); |
601 | table_flush_by_iface(sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
602 | } |
603 | ||
604 | /** | |
4cc955de | 605 | * table_path_del - delete a path from the mesh or mpp table |
eb2b9311 | 606 | * |
4cc955de | 607 | * @tbl: mesh or mpp path table |
f698d856 | 608 | * @sdata: local subif |
4cc955de | 609 | * @addr: dst address (ETH_ALEN length) |
eb2b9311 | 610 | * |
af901ca1 | 611 | * Returns: 0 if successful |
eb2b9311 | 612 | */ |
60854fd9 | 613 | static int table_path_del(struct mesh_table *tbl, |
4cc955de HR |
614 | struct ieee80211_sub_if_data *sdata, |
615 | const u8 *addr) | |
eb2b9311 LCC |
616 | { |
617 | struct mesh_path *mpath; | |
60854fd9 | 618 | |
b4c3fbe6 | 619 | spin_lock_bh(&tbl->walk_lock); |
60854fd9 BC |
620 | mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); |
621 | if (!mpath) { | |
f2ffff08 | 622 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 623 | return -ENXIO; |
eb2b9311 LCC |
624 | } |
625 | ||
60854fd9 | 626 | __mesh_path_del(tbl, mpath); |
b4c3fbe6 | 627 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 628 | return 0; |
4cc955de HR |
629 | } |
630 | ||
60854fd9 | 631 | |
4cc955de HR |
632 | /** |
633 | * mesh_path_del - delete a mesh path from the table | |
634 | * | |
635 | * @addr: dst address (ETH_ALEN length) | |
636 | * @sdata: local subif | |
637 | * | |
638 | * Returns: 0 if successful | |
639 | */ | |
640 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) | |
641 | { | |
60854fd9 | 642 | int err; |
4cc955de HR |
643 | |
644 | /* flush relevant mpp entries first */ | |
645 | mpp_flush_by_proxy(sdata, addr); | |
646 | ||
2bdaf386 BC |
647 | err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr); |
648 | sdata->u.mesh.mesh_paths_generation++; | |
ab1c7906 HR |
649 | return err; |
650 | } | |
651 | ||
eb2b9311 LCC |
652 | /** |
653 | * mesh_path_tx_pending - sends pending frames in a mesh path queue | |
654 | * | |
655 | * @mpath: mesh path to activate | |
656 | * | |
657 | * Locking: the state_lock of the mpath structure must NOT be held when calling | |
658 | * this function. | |
659 | */ | |
660 | void mesh_path_tx_pending(struct mesh_path *mpath) | |
661 | { | |
249b405c JC |
662 | if (mpath->flags & MESH_PATH_ACTIVE) |
663 | ieee80211_add_pending_skbs(mpath->sdata->local, | |
664 | &mpath->frame_queue); | |
eb2b9311 LCC |
665 | } |
666 | ||
5ee68e5b JC |
667 | /** |
668 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates | |
669 | * | |
670 | * @mpath: mesh path whose queue will be emptied | |
671 | * | |
672 | * If there is only one gate, the frames are transferred from the failed mpath | |
673 | * queue to that gate's queue. If there are more than one gates, the frames | |
674 | * are copied from each gate to the next. After frames are copied, the | |
675 | * mpath queues are emptied onto the transmission queue. | |
676 | */ | |
677 | int mesh_path_send_to_gates(struct mesh_path *mpath) | |
678 | { | |
679 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b JC |
680 | struct mesh_table *tbl; |
681 | struct mesh_path *from_mpath = mpath; | |
60854fd9 | 682 | struct mesh_path *gate; |
5ee68e5b | 683 | bool copy = false; |
5ee68e5b | 684 | |
60854fd9 | 685 | tbl = sdata->u.mesh.mesh_paths; |
5ee68e5b | 686 | |
60854fd9 | 687 | rcu_read_lock(); |
18b27ff7 | 688 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
689 | if (gate->flags & MESH_PATH_ACTIVE) { |
690 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); | |
691 | mesh_path_move_to_queue(gate, from_mpath, copy); | |
692 | from_mpath = gate; | |
5ee68e5b JC |
693 | copy = true; |
694 | } else { | |
bdcbd8e0 | 695 | mpath_dbg(sdata, |
d671b2a0 | 696 | "Not forwarding to %pM (flags %#x)\n", |
947c2a0e | 697 | gate->dst, gate->flags); |
5ee68e5b JC |
698 | } |
699 | } | |
700 | ||
18b27ff7 | 701 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
702 | mpath_dbg(sdata, "Sending to %pM\n", gate->dst); |
703 | mesh_path_tx_pending(gate); | |
2bdaf386 | 704 | } |
60854fd9 | 705 | rcu_read_unlock(); |
5ee68e5b JC |
706 | |
707 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; | |
708 | } | |
709 | ||
eb2b9311 LCC |
710 | /** |
711 | * mesh_path_discard_frame - discard a frame whose path could not be resolved | |
712 | * | |
713 | * @skb: frame to discard | |
f698d856 | 714 | * @sdata: network subif the frame was to be sent through |
eb2b9311 | 715 | * |
eb2b9311 LCC |
716 | * Locking: the function must me called within a rcu_read_lock region |
717 | */ | |
bf7cd94d JB |
718 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
719 | struct sk_buff *skb) | |
eb2b9311 | 720 | { |
eb2b9311 | 721 | kfree_skb(skb); |
472dbc45 | 722 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
eb2b9311 LCC |
723 | } |
724 | ||
725 | /** | |
726 | * mesh_path_flush_pending - free the pending queue of a mesh path | |
727 | * | |
728 | * @mpath: mesh path whose queue has to be freed | |
729 | * | |
25985edc | 730 | * Locking: the function must me called within a rcu_read_lock region |
eb2b9311 LCC |
731 | */ |
732 | void mesh_path_flush_pending(struct mesh_path *mpath) | |
733 | { | |
eb2b9311 LCC |
734 | struct sk_buff *skb; |
735 | ||
00e3f25c | 736 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
bf7cd94d | 737 | mesh_path_discard_frame(mpath->sdata, skb); |
eb2b9311 LCC |
738 | } |
739 | ||
740 | /** | |
741 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path | |
742 | * | |
743 | * @mpath: the mesh path to modify | |
744 | * @next_hop: the next hop to force | |
745 | * | |
746 | * Locking: this function must be called holding mpath->state_lock | |
747 | */ | |
748 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) | |
749 | { | |
750 | spin_lock_bh(&mpath->state_lock); | |
751 | mesh_path_assign_nexthop(mpath, next_hop); | |
d19b3bf6 | 752 | mpath->sn = 0xffff; |
eb2b9311 LCC |
753 | mpath->metric = 0; |
754 | mpath->hop_count = 0; | |
755 | mpath->exp_time = 0; | |
5df20f21 | 756 | mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; |
eb2b9311 LCC |
757 | mesh_path_activate(mpath); |
758 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
759 | ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); |
760 | /* init it at a low value - 0 start is tricky */ | |
761 | ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); | |
eb2b9311 LCC |
762 | mesh_path_tx_pending(mpath); |
763 | } | |
764 | ||
2bdaf386 | 765 | int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 766 | { |
349eb8cf | 767 | struct mesh_table *tbl_path, *tbl_mpp; |
4c5ade41 | 768 | int ret; |
349eb8cf | 769 | |
60854fd9 | 770 | tbl_path = mesh_table_alloc(); |
349eb8cf | 771 | if (!tbl_path) |
79617dee | 772 | return -ENOMEM; |
5ee68e5b | 773 | |
60854fd9 | 774 | tbl_mpp = mesh_table_alloc(); |
349eb8cf | 775 | if (!tbl_mpp) { |
4c5ade41 DC |
776 | ret = -ENOMEM; |
777 | goto free_path; | |
79617dee | 778 | } |
349eb8cf | 779 | |
60854fd9 BC |
780 | rhashtable_init(&tbl_path->rhead, &mesh_rht_params); |
781 | rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params); | |
2bdaf386 | 782 | |
60854fd9 BC |
783 | sdata->u.mesh.mesh_paths = tbl_path; |
784 | sdata->u.mesh.mpp_paths = tbl_mpp; | |
79617dee | 785 | |
eb2b9311 | 786 | return 0; |
4c5ade41 | 787 | |
4c5ade41 | 788 | free_path: |
60854fd9 | 789 | mesh_table_free(tbl_path); |
4c5ade41 | 790 | return ret; |
eb2b9311 LCC |
791 | } |
792 | ||
60854fd9 BC |
793 | static |
794 | void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, | |
795 | struct mesh_table *tbl) | |
eb2b9311 LCC |
796 | { |
797 | struct mesh_path *mpath; | |
b4c3fbe6 | 798 | struct hlist_node *n; |
eb2b9311 | 799 | |
b4c3fbe6 HX |
800 | spin_lock_bh(&tbl->walk_lock); |
801 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
eb2b9311 LCC |
802 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
803 | (!(mpath->flags & MESH_PATH_FIXED)) && | |
f5e50cd0 | 804 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
60854fd9 | 805 | __mesh_path_del(tbl, mpath); |
ab1c7906 | 806 | } |
b4c3fbe6 | 807 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 808 | } |
ab1c7906 | 809 | |
60854fd9 BC |
810 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
811 | { | |
812 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths); | |
813 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
814 | } |
815 | ||
2bdaf386 | 816 | void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 817 | { |
60854fd9 BC |
818 | mesh_table_free(sdata->u.mesh.mesh_paths); |
819 | mesh_table_free(sdata->u.mesh.mpp_paths); | |
eb2b9311 | 820 | } |