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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
eb2b9311 | 2 | /* |
264d9b7d | 3 | * Copyright (c) 2008, 2009 open80211s Ltd. |
eb2b9311 | 4 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
eb2b9311 LCC |
5 | */ |
6 | ||
7 | #include <linux/etherdevice.h> | |
8 | #include <linux/list.h> | |
eb2b9311 | 9 | #include <linux/random.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
eb2b9311 LCC |
11 | #include <linux/spinlock.h> |
12 | #include <linux/string.h> | |
13 | #include <net/mac80211.h> | |
4777be41 | 14 | #include "wme.h" |
eb2b9311 LCC |
15 | #include "ieee80211_i.h" |
16 | #include "mesh.h" | |
17 | ||
74932959 BC |
18 | static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath); |
19 | ||
60854fd9 BC |
20 | static u32 mesh_table_hash(const void *addr, u32 len, u32 seed) |
21 | { | |
22 | /* Use last four bytes of hw addr as hash index */ | |
40586e3f | 23 | return jhash_1word(__get_unaligned_cpu32((u8 *)addr + 2), seed); |
60854fd9 | 24 | } |
eb2b9311 | 25 | |
60854fd9 BC |
26 | static const struct rhashtable_params mesh_rht_params = { |
27 | .nelem_hint = 2, | |
28 | .automatic_shrinking = true, | |
29 | .key_len = ETH_ALEN, | |
30 | .key_offset = offsetof(struct mesh_path, dst), | |
31 | .head_offset = offsetof(struct mesh_path, rhash), | |
32 | .hashfn = mesh_table_hash, | |
33 | }; | |
eb2b9311 | 34 | |
bf7cd94d JB |
35 | static inline bool mpath_expired(struct mesh_path *mpath) |
36 | { | |
37 | return (mpath->flags & MESH_PATH_ACTIVE) && | |
38 | time_after(jiffies, mpath->exp_time) && | |
39 | !(mpath->flags & MESH_PATH_FIXED); | |
40 | } | |
eb2b9311 | 41 | |
74932959 | 42 | static void mesh_path_rht_free(void *ptr, void *tblptr) |
349eb8cf | 43 | { |
60854fd9 | 44 | struct mesh_path *mpath = ptr; |
74932959 BC |
45 | struct mesh_table *tbl = tblptr; |
46 | ||
47 | mesh_path_free_rcu(tbl, mpath); | |
349eb8cf JB |
48 | } |
49 | ||
226825f1 | 50 | static void mesh_table_init(struct mesh_table *tbl) |
6b86bd62 | 51 | { |
226825f1 PS |
52 | INIT_HLIST_HEAD(&tbl->known_gates); |
53 | INIT_HLIST_HEAD(&tbl->walk_head); | |
54 | atomic_set(&tbl->entries, 0); | |
55 | spin_lock_init(&tbl->gates_lock); | |
56 | spin_lock_init(&tbl->walk_lock); | |
6b86bd62 | 57 | |
226825f1 PS |
58 | /* rhashtable_init() may fail only in case of wrong |
59 | * mesh_rht_params | |
60 | */ | |
61 | WARN_ON(rhashtable_init(&tbl->rhead, &mesh_rht_params)); | |
6b86bd62 JB |
62 | } |
63 | ||
60854fd9 | 64 | static void mesh_table_free(struct mesh_table *tbl) |
18889231 | 65 | { |
60854fd9 | 66 | rhashtable_free_and_destroy(&tbl->rhead, |
74932959 | 67 | mesh_path_rht_free, tbl); |
18889231 JC |
68 | } |
69 | ||
eb2b9311 | 70 | /** |
eb2b9311 LCC |
71 | * mesh_path_assign_nexthop - update mesh path next hop |
72 | * | |
73 | * @mpath: mesh path to update | |
74 | * @sta: next hop to assign | |
75 | * | |
76 | * Locking: mpath->state_lock must be held when calling this function | |
77 | */ | |
78 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) | |
79 | { | |
10c836d7 JC |
80 | struct sk_buff *skb; |
81 | struct ieee80211_hdr *hdr; | |
10c836d7 JC |
82 | unsigned long flags; |
83 | ||
d0709a65 | 84 | rcu_assign_pointer(mpath->next_hop, sta); |
10c836d7 | 85 | |
10c836d7 | 86 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
b22bd522 | 87 | skb_queue_walk(&mpath->frame_queue, skb) { |
10c836d7 JC |
88 | hdr = (struct ieee80211_hdr *) skb->data; |
89 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); | |
7e3c8866 | 90 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
3f52b7e3 | 91 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
10c836d7 JC |
92 | } |
93 | ||
10c836d7 | 94 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
eb2b9311 LCC |
95 | } |
96 | ||
5ee68e5b JC |
97 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
98 | struct mesh_path *gate_mpath) | |
99 | { | |
100 | struct ieee80211_hdr *hdr; | |
101 | struct ieee80211s_hdr *mshdr; | |
102 | int mesh_hdrlen, hdrlen; | |
103 | char *next_hop; | |
104 | ||
105 | hdr = (struct ieee80211_hdr *) skb->data; | |
106 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
107 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
108 | ||
109 | if (!(mshdr->flags & MESH_FLAGS_AE)) { | |
110 | /* size of the fixed part of the mesh header */ | |
111 | mesh_hdrlen = 6; | |
112 | ||
113 | /* make room for the two extended addresses */ | |
114 | skb_push(skb, 2 * ETH_ALEN); | |
115 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); | |
116 | ||
117 | hdr = (struct ieee80211_hdr *) skb->data; | |
118 | ||
119 | /* we preserve the previous mesh header and only add | |
ab4040df | 120 | * the new addresses */ |
5ee68e5b JC |
121 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
122 | mshdr->flags = MESH_FLAGS_AE_A5_A6; | |
123 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); | |
124 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); | |
125 | } | |
126 | ||
127 | /* update next hop */ | |
128 | hdr = (struct ieee80211_hdr *) skb->data; | |
129 | rcu_read_lock(); | |
130 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; | |
131 | memcpy(hdr->addr1, next_hop, ETH_ALEN); | |
132 | rcu_read_unlock(); | |
7e3c8866 | 133 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
5ee68e5b JC |
134 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
135 | } | |
136 | ||
137 | /** | |
5ee68e5b JC |
138 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another |
139 | * | |
140 | * This function is used to transfer or copy frames from an unresolved mpath to | |
141 | * a gate mpath. The function also adds the Address Extension field and | |
142 | * updates the next hop. | |
143 | * | |
144 | * If a frame already has an Address Extension field, only the next hop and | |
145 | * destination addresses are updated. | |
146 | * | |
147 | * The gate mpath must be an active mpath with a valid mpath->next_hop. | |
148 | * | |
9fd00b4d | 149 | * @gate_mpath: An active mpath the frames will be sent to (i.e. the gate) |
5ee68e5b JC |
150 | * @from_mpath: The failed mpath |
151 | * @copy: When true, copy all the frames to the new mpath queue. When false, | |
152 | * move them. | |
153 | */ | |
154 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, | |
155 | struct mesh_path *from_mpath, | |
156 | bool copy) | |
157 | { | |
4bd4c2dd TP |
158 | struct sk_buff *skb, *fskb, *tmp; |
159 | struct sk_buff_head failq; | |
5ee68e5b | 160 | unsigned long flags; |
5ee68e5b | 161 | |
8c5bb1fa JB |
162 | if (WARN_ON(gate_mpath == from_mpath)) |
163 | return; | |
164 | if (WARN_ON(!gate_mpath->next_hop)) | |
165 | return; | |
5ee68e5b | 166 | |
5ee68e5b JC |
167 | __skb_queue_head_init(&failq); |
168 | ||
169 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
170 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); | |
171 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
172 | ||
4bd4c2dd TP |
173 | skb_queue_walk_safe(&failq, fskb, tmp) { |
174 | if (skb_queue_len(&gate_mpath->frame_queue) >= | |
175 | MESH_FRAME_QUEUE_LEN) { | |
176 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); | |
177 | break; | |
817a53d9 | 178 | } |
5ee68e5b | 179 | |
4bd4c2dd TP |
180 | skb = skb_copy(fskb, GFP_ATOMIC); |
181 | if (WARN_ON(!skb)) | |
182 | break; | |
183 | ||
5ee68e5b | 184 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
4bd4c2dd TP |
185 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
186 | ||
187 | if (copy) | |
188 | continue; | |
189 | ||
190 | __skb_unlink(fskb, &failq); | |
191 | kfree_skb(fskb); | |
5ee68e5b JC |
192 | } |
193 | ||
bdcbd8e0 JB |
194 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
195 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); | |
5ee68e5b JC |
196 | |
197 | if (!copy) | |
198 | return; | |
199 | ||
200 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); | |
201 | skb_queue_splice(&failq, &from_mpath->frame_queue); | |
202 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); | |
203 | } | |
204 | ||
eb2b9311 | 205 | |
4a3cb702 JB |
206 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
207 | struct ieee80211_sub_if_data *sdata) | |
eb2b9311 LCC |
208 | { |
209 | struct mesh_path *mpath; | |
60854fd9 | 210 | |
ef618b1b | 211 | mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params); |
60854fd9 BC |
212 | |
213 | if (mpath && mpath_expired(mpath)) { | |
214 | spin_lock_bh(&mpath->state_lock); | |
215 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
216 | spin_unlock_bh(&mpath->state_lock); | |
eb2b9311 | 217 | } |
60854fd9 | 218 | return mpath; |
eb2b9311 LCC |
219 | } |
220 | ||
239289e4 JC |
221 | /** |
222 | * mesh_path_lookup - look up a path in the mesh path table | |
239289e4 | 223 | * @sdata: local subif |
bf7cd94d | 224 | * @dst: hardware address (ETH_ALEN length) of destination |
239289e4 JC |
225 | * |
226 | * Returns: pointer to the mesh path structure, or NULL if not found | |
227 | * | |
228 | * Locking: must be called within a read rcu section. | |
229 | */ | |
bf7cd94d JB |
230 | struct mesh_path * |
231 | mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
79617dee | 232 | { |
226825f1 | 233 | return mpath_lookup(&sdata->u.mesh.mesh_paths, dst, sdata); |
239289e4 | 234 | } |
79617dee | 235 | |
bf7cd94d JB |
236 | struct mesh_path * |
237 | mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) | |
239289e4 | 238 | { |
226825f1 | 239 | return mpath_lookup(&sdata->u.mesh.mpp_paths, dst, sdata); |
79617dee Y |
240 | } |
241 | ||
60854fd9 BC |
242 | static struct mesh_path * |
243 | __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) | |
244 | { | |
b4c3fbe6 HX |
245 | int i = 0; |
246 | struct mesh_path *mpath; | |
60854fd9 | 247 | |
b4c3fbe6 | 248 | hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { |
60854fd9 BC |
249 | if (i++ == idx) |
250 | break; | |
251 | } | |
60854fd9 | 252 | |
b4c3fbe6 | 253 | if (!mpath) |
60854fd9 BC |
254 | return NULL; |
255 | ||
256 | if (mpath_expired(mpath)) { | |
257 | spin_lock_bh(&mpath->state_lock); | |
258 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
259 | spin_unlock_bh(&mpath->state_lock); | |
260 | } | |
261 | return mpath; | |
262 | } | |
79617dee | 263 | |
eb2b9311 LCC |
264 | /** |
265 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index | |
266 | * @idx: index | |
f698d856 | 267 | * @sdata: local subif, or NULL for all entries |
eb2b9311 LCC |
268 | * |
269 | * Returns: pointer to the mesh path structure, or NULL if not found. | |
270 | * | |
271 | * Locking: must be called within a read rcu section. | |
272 | */ | |
bf7cd94d JB |
273 | struct mesh_path * |
274 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
eb2b9311 | 275 | { |
226825f1 | 276 | return __mesh_path_lookup_by_idx(&sdata->u.mesh.mesh_paths, idx); |
eb2b9311 LCC |
277 | } |
278 | ||
a2db2ed3 HR |
279 | /** |
280 | * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index | |
281 | * @idx: index | |
282 | * @sdata: local subif, or NULL for all entries | |
283 | * | |
284 | * Returns: pointer to the proxy path structure, or NULL if not found. | |
285 | * | |
286 | * Locking: must be called within a read rcu section. | |
287 | */ | |
288 | struct mesh_path * | |
289 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) | |
290 | { | |
226825f1 | 291 | return __mesh_path_lookup_by_idx(&sdata->u.mesh.mpp_paths, idx); |
a2db2ed3 HR |
292 | } |
293 | ||
5ee68e5b | 294 | /** |
30be52e4 JB |
295 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
296 | * @mpath: gate path to add to table | |
5ee68e5b | 297 | */ |
30be52e4 | 298 | int mesh_path_add_gate(struct mesh_path *mpath) |
5ee68e5b | 299 | { |
30be52e4 | 300 | struct mesh_table *tbl; |
5ee68e5b JC |
301 | int err; |
302 | ||
303 | rcu_read_lock(); | |
226825f1 | 304 | tbl = &mpath->sdata->u.mesh.mesh_paths; |
5ee68e5b | 305 | |
947c2a0e BC |
306 | spin_lock_bh(&mpath->state_lock); |
307 | if (mpath->is_gate) { | |
308 | err = -EEXIST; | |
309 | spin_unlock_bh(&mpath->state_lock); | |
5ee68e5b JC |
310 | goto err_rcu; |
311 | } | |
5ee68e5b JC |
312 | mpath->is_gate = true; |
313 | mpath->sdata->u.mesh.num_gates++; | |
947c2a0e BC |
314 | |
315 | spin_lock(&tbl->gates_lock); | |
18b27ff7 | 316 | hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); |
947c2a0e BC |
317 | spin_unlock(&tbl->gates_lock); |
318 | ||
319 | spin_unlock_bh(&mpath->state_lock); | |
320 | ||
bdcbd8e0 JB |
321 | mpath_dbg(mpath->sdata, |
322 | "Mesh path: Recorded new gate: %pM. %d known gates\n", | |
323 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
bf7cd94d | 324 | err = 0; |
5ee68e5b JC |
325 | err_rcu: |
326 | rcu_read_unlock(); | |
327 | return err; | |
328 | } | |
329 | ||
330 | /** | |
331 | * mesh_gate_del - remove a mesh gate from the list of known gates | |
332 | * @tbl: table which holds our list of known gates | |
333 | * @mpath: gate mpath | |
5ee68e5b | 334 | */ |
bf7cd94d | 335 | static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
5ee68e5b | 336 | { |
947c2a0e BC |
337 | lockdep_assert_held(&mpath->state_lock); |
338 | if (!mpath->is_gate) | |
339 | return; | |
5ee68e5b | 340 | |
947c2a0e BC |
341 | mpath->is_gate = false; |
342 | spin_lock_bh(&tbl->gates_lock); | |
343 | hlist_del_rcu(&mpath->gate_list); | |
344 | mpath->sdata->u.mesh.num_gates--; | |
345 | spin_unlock_bh(&tbl->gates_lock); | |
346 | ||
347 | mpath_dbg(mpath->sdata, | |
348 | "Mesh path: Deleted gate: %pM. %d known gates\n", | |
349 | mpath->dst, mpath->sdata->u.mesh.num_gates); | |
5ee68e5b JC |
350 | } |
351 | ||
5ee68e5b JC |
352 | /** |
353 | * mesh_gate_num - number of gates known to this interface | |
354 | * @sdata: subif data | |
355 | */ | |
356 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) | |
357 | { | |
358 | return sdata->u.mesh.num_gates; | |
359 | } | |
360 | ||
b15dc38b BC |
361 | static |
362 | struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, | |
363 | const u8 *dst, gfp_t gfp_flags) | |
364 | { | |
365 | struct mesh_path *new_mpath; | |
366 | ||
367 | new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); | |
368 | if (!new_mpath) | |
369 | return NULL; | |
370 | ||
371 | memcpy(new_mpath->dst, dst, ETH_ALEN); | |
372 | eth_broadcast_addr(new_mpath->rann_snd_addr); | |
373 | new_mpath->is_root = false; | |
374 | new_mpath->sdata = sdata; | |
375 | new_mpath->flags = 0; | |
376 | skb_queue_head_init(&new_mpath->frame_queue); | |
b15dc38b BC |
377 | new_mpath->exp_time = jiffies; |
378 | spin_lock_init(&new_mpath->state_lock); | |
34f11cd3 | 379 | timer_setup(&new_mpath->timer, mesh_path_timer, 0); |
b15dc38b BC |
380 | |
381 | return new_mpath; | |
382 | } | |
383 | ||
eb2b9311 LCC |
384 | /** |
385 | * mesh_path_add - allocate and add a new path to the mesh path table | |
bf7cd94d | 386 | * @dst: destination address of the path (ETH_ALEN length) |
f698d856 | 387 | * @sdata: local subif |
eb2b9311 | 388 | * |
af901ca1 | 389 | * Returns: 0 on success |
eb2b9311 LCC |
390 | * |
391 | * State: the initial state of the new path is set to 0 | |
392 | */ | |
ae76eef0 BC |
393 | struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
394 | const u8 *dst) | |
eb2b9311 | 395 | { |
349eb8cf | 396 | struct mesh_table *tbl; |
eb2b9311 | 397 | struct mesh_path *mpath, *new_mpath; |
eb2b9311 | 398 | |
b203ca39 | 399 | if (ether_addr_equal(dst, sdata->vif.addr)) |
eb2b9311 | 400 | /* never add ourselves as neighbours */ |
ae76eef0 | 401 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 LCC |
402 | |
403 | if (is_multicast_ether_addr(dst)) | |
ae76eef0 | 404 | return ERR_PTR(-ENOTSUPP); |
eb2b9311 | 405 | |
472dbc45 | 406 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
ae76eef0 BC |
407 | return ERR_PTR(-ENOSPC); |
408 | ||
b15dc38b | 409 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
402d7752 | 410 | if (!new_mpath) |
60854fd9 | 411 | return ERR_PTR(-ENOMEM); |
18889231 | 412 | |
226825f1 | 413 | tbl = &sdata->u.mesh.mesh_paths; |
b4c3fbe6 | 414 | spin_lock_bh(&tbl->walk_lock); |
36922931 HX |
415 | mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead, |
416 | &new_mpath->rhash, | |
417 | mesh_rht_params); | |
418 | if (!mpath) | |
419 | hlist_add_head(&new_mpath->walk_list, &tbl->walk_head); | |
b4c3fbe6 | 420 | spin_unlock_bh(&tbl->walk_lock); |
18889231 | 421 | |
36922931 | 422 | if (mpath) { |
60854fd9 | 423 | kfree(new_mpath); |
4ff3a9d1 | 424 | |
36922931 HX |
425 | if (IS_ERR(mpath)) |
426 | return mpath; | |
4ff3a9d1 | 427 | |
60854fd9 | 428 | new_mpath = mpath; |
18889231 | 429 | } |
4ff3a9d1 | 430 | |
60854fd9 BC |
431 | sdata->u.mesh.mesh_paths_generation++; |
432 | return new_mpath; | |
18889231 | 433 | } |
eb2b9311 | 434 | |
bf7cd94d JB |
435 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
436 | const u8 *dst, const u8 *mpp) | |
79617dee | 437 | { |
349eb8cf | 438 | struct mesh_table *tbl; |
60854fd9 BC |
439 | struct mesh_path *new_mpath; |
440 | int ret; | |
79617dee | 441 | |
b203ca39 | 442 | if (ether_addr_equal(dst, sdata->vif.addr)) |
79617dee Y |
443 | /* never add ourselves as neighbours */ |
444 | return -ENOTSUPP; | |
445 | ||
446 | if (is_multicast_ether_addr(dst)) | |
447 | return -ENOTSUPP; | |
448 | ||
b15dc38b | 449 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
79617dee | 450 | |
60854fd9 BC |
451 | if (!new_mpath) |
452 | return -ENOMEM; | |
79617dee | 453 | |
79617dee | 454 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
226825f1 | 455 | tbl = &sdata->u.mesh.mpp_paths; |
b4c3fbe6 HX |
456 | |
457 | spin_lock_bh(&tbl->walk_lock); | |
60854fd9 BC |
458 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, |
459 | &new_mpath->rhash, | |
460 | mesh_rht_params); | |
b4c3fbe6 HX |
461 | if (!ret) |
462 | hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head); | |
463 | spin_unlock_bh(&tbl->walk_lock); | |
a2db2ed3 | 464 | |
4ff3a9d1 HX |
465 | if (ret) |
466 | kfree(new_mpath); | |
467 | ||
2bdaf386 | 468 | sdata->u.mesh.mpp_paths_generation++; |
60854fd9 | 469 | return ret; |
79617dee Y |
470 | } |
471 | ||
472 | ||
eb2b9311 LCC |
473 | /** |
474 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks | |
475 | * | |
476 | * @sta: broken peer link | |
477 | * | |
478 | * This function must be called from the rate control algorithm if enough | |
479 | * delivery errors suggest that a peer link is no longer usable. | |
480 | */ | |
481 | void mesh_plink_broken(struct sta_info *sta) | |
482 | { | |
60854fd9 | 483 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
226825f1 | 484 | struct mesh_table *tbl = &sdata->u.mesh.mesh_paths; |
15ff6365 | 485 | static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
eb2b9311 | 486 | struct mesh_path *mpath; |
60854fd9 | 487 | |
b4c3fbe6 HX |
488 | rcu_read_lock(); |
489 | hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { | |
2688eba9 | 490 | if (rcu_access_pointer(mpath->next_hop) == sta && |
eb2b9311 LCC |
491 | mpath->flags & MESH_PATH_ACTIVE && |
492 | !(mpath->flags & MESH_PATH_FIXED)) { | |
f5e50cd0 | 493 | spin_lock_bh(&mpath->state_lock); |
eb2b9311 | 494 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 495 | ++mpath->sn; |
eb2b9311 | 496 | spin_unlock_bh(&mpath->state_lock); |
bf7cd94d | 497 | mesh_path_error_tx(sdata, |
f63f8421 CYY |
498 | sdata->u.mesh.mshcfg.element_ttl, |
499 | mpath->dst, mpath->sn, | |
500 | WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); | |
f5e50cd0 | 501 | } |
eb2b9311 | 502 | } |
b4c3fbe6 | 503 | rcu_read_unlock(); |
19c50b3d JC |
504 | } |
505 | ||
74932959 BC |
506 | static void mesh_path_free_rcu(struct mesh_table *tbl, |
507 | struct mesh_path *mpath) | |
19c50b3d | 508 | { |
60854fd9 | 509 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
c2e703a5 | 510 | |
947c2a0e | 511 | spin_lock_bh(&mpath->state_lock); |
74932959 | 512 | mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; |
60854fd9 | 513 | mesh_gate_del(tbl, mpath); |
947c2a0e | 514 | spin_unlock_bh(&mpath->state_lock); |
74932959 | 515 | del_timer_sync(&mpath->timer); |
c2e703a5 | 516 | atomic_dec(&sdata->u.mesh.mpaths); |
19c50b3d | 517 | atomic_dec(&tbl->entries); |
5e43540c | 518 | mesh_path_flush_pending(mpath); |
74932959 BC |
519 | kfree_rcu(mpath, rcu); |
520 | } | |
521 | ||
522 | static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) | |
523 | { | |
b4c3fbe6 | 524 | hlist_del_rcu(&mpath->walk_list); |
74932959 BC |
525 | rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); |
526 | mesh_path_free_rcu(tbl, mpath); | |
19c50b3d JC |
527 | } |
528 | ||
eb2b9311 LCC |
529 | /** |
530 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches | |
531 | * | |
2c53040f | 532 | * @sta: mesh peer to match |
eb2b9311 | 533 | * |
b4e08ea1 LCC |
534 | * RCU notes: this function is called when a mesh plink transitions from |
535 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that | |
536 | * allows path creation. This will happen before the sta can be freed (because | |
d0709a65 JB |
537 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
538 | * protected against the plink disappearing. | |
eb2b9311 LCC |
539 | */ |
540 | void mesh_path_flush_by_nexthop(struct sta_info *sta) | |
541 | { | |
2bdaf386 | 542 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
226825f1 | 543 | struct mesh_table *tbl = &sdata->u.mesh.mesh_paths; |
eb2b9311 | 544 | struct mesh_path *mpath; |
b4c3fbe6 | 545 | struct hlist_node *n; |
60854fd9 | 546 | |
b4c3fbe6 HX |
547 | spin_lock_bh(&tbl->walk_lock); |
548 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 BC |
549 | if (rcu_access_pointer(mpath->next_hop) == sta) |
550 | __mesh_path_del(tbl, mpath); | |
eb2b9311 | 551 | } |
b4c3fbe6 | 552 | spin_unlock_bh(&tbl->walk_lock); |
eb2b9311 LCC |
553 | } |
554 | ||
bf5a70e1 HR |
555 | static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
556 | const u8 *proxy) | |
557 | { | |
226825f1 | 558 | struct mesh_table *tbl = &sdata->u.mesh.mpp_paths; |
60854fd9 | 559 | struct mesh_path *mpath; |
b4c3fbe6 | 560 | struct hlist_node *n; |
60854fd9 | 561 | |
b4c3fbe6 HX |
562 | spin_lock_bh(&tbl->walk_lock); |
563 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 BC |
564 | if (ether_addr_equal(mpath->mpp, proxy)) |
565 | __mesh_path_del(tbl, mpath); | |
bf5a70e1 | 566 | } |
b4c3fbe6 | 567 | spin_unlock_bh(&tbl->walk_lock); |
bf5a70e1 HR |
568 | } |
569 | ||
60854fd9 | 570 | static void table_flush_by_iface(struct mesh_table *tbl) |
eb2b9311 LCC |
571 | { |
572 | struct mesh_path *mpath; | |
b4c3fbe6 | 573 | struct hlist_node *n; |
60854fd9 | 574 | |
b4c3fbe6 HX |
575 | spin_lock_bh(&tbl->walk_lock); |
576 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
60854fd9 | 577 | __mesh_path_del(tbl, mpath); |
eb2b9311 | 578 | } |
b4c3fbe6 | 579 | spin_unlock_bh(&tbl->walk_lock); |
eb2b9311 LCC |
580 | } |
581 | ||
ece1a2e7 JC |
582 | /** |
583 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface | |
584 | * | |
585 | * This function deletes both mesh paths as well as mesh portal paths. | |
586 | * | |
2c53040f | 587 | * @sdata: interface data to match |
ece1a2e7 JC |
588 | * |
589 | */ | |
590 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) | |
eb2b9311 | 591 | { |
226825f1 PS |
592 | table_flush_by_iface(&sdata->u.mesh.mesh_paths); |
593 | table_flush_by_iface(&sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
594 | } |
595 | ||
596 | /** | |
4cc955de | 597 | * table_path_del - delete a path from the mesh or mpp table |
eb2b9311 | 598 | * |
4cc955de | 599 | * @tbl: mesh or mpp path table |
f698d856 | 600 | * @sdata: local subif |
4cc955de | 601 | * @addr: dst address (ETH_ALEN length) |
eb2b9311 | 602 | * |
af901ca1 | 603 | * Returns: 0 if successful |
eb2b9311 | 604 | */ |
60854fd9 | 605 | static int table_path_del(struct mesh_table *tbl, |
4cc955de HR |
606 | struct ieee80211_sub_if_data *sdata, |
607 | const u8 *addr) | |
eb2b9311 LCC |
608 | { |
609 | struct mesh_path *mpath; | |
60854fd9 | 610 | |
b4c3fbe6 | 611 | spin_lock_bh(&tbl->walk_lock); |
60854fd9 BC |
612 | mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); |
613 | if (!mpath) { | |
f2ffff08 | 614 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 615 | return -ENXIO; |
eb2b9311 LCC |
616 | } |
617 | ||
60854fd9 | 618 | __mesh_path_del(tbl, mpath); |
b4c3fbe6 | 619 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 620 | return 0; |
4cc955de HR |
621 | } |
622 | ||
60854fd9 | 623 | |
4cc955de HR |
624 | /** |
625 | * mesh_path_del - delete a mesh path from the table | |
626 | * | |
627 | * @addr: dst address (ETH_ALEN length) | |
628 | * @sdata: local subif | |
629 | * | |
630 | * Returns: 0 if successful | |
631 | */ | |
632 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) | |
633 | { | |
60854fd9 | 634 | int err; |
4cc955de HR |
635 | |
636 | /* flush relevant mpp entries first */ | |
637 | mpp_flush_by_proxy(sdata, addr); | |
638 | ||
226825f1 | 639 | err = table_path_del(&sdata->u.mesh.mesh_paths, sdata, addr); |
2bdaf386 | 640 | sdata->u.mesh.mesh_paths_generation++; |
ab1c7906 HR |
641 | return err; |
642 | } | |
643 | ||
eb2b9311 LCC |
644 | /** |
645 | * mesh_path_tx_pending - sends pending frames in a mesh path queue | |
646 | * | |
647 | * @mpath: mesh path to activate | |
648 | * | |
649 | * Locking: the state_lock of the mpath structure must NOT be held when calling | |
650 | * this function. | |
651 | */ | |
652 | void mesh_path_tx_pending(struct mesh_path *mpath) | |
653 | { | |
249b405c JC |
654 | if (mpath->flags & MESH_PATH_ACTIVE) |
655 | ieee80211_add_pending_skbs(mpath->sdata->local, | |
656 | &mpath->frame_queue); | |
eb2b9311 LCC |
657 | } |
658 | ||
5ee68e5b JC |
659 | /** |
660 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates | |
661 | * | |
662 | * @mpath: mesh path whose queue will be emptied | |
663 | * | |
664 | * If there is only one gate, the frames are transferred from the failed mpath | |
665 | * queue to that gate's queue. If there are more than one gates, the frames | |
666 | * are copied from each gate to the next. After frames are copied, the | |
667 | * mpath queues are emptied onto the transmission queue. | |
668 | */ | |
669 | int mesh_path_send_to_gates(struct mesh_path *mpath) | |
670 | { | |
671 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b JC |
672 | struct mesh_table *tbl; |
673 | struct mesh_path *from_mpath = mpath; | |
60854fd9 | 674 | struct mesh_path *gate; |
5ee68e5b | 675 | bool copy = false; |
5ee68e5b | 676 | |
226825f1 | 677 | tbl = &sdata->u.mesh.mesh_paths; |
5ee68e5b | 678 | |
60854fd9 | 679 | rcu_read_lock(); |
18b27ff7 | 680 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
681 | if (gate->flags & MESH_PATH_ACTIVE) { |
682 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); | |
683 | mesh_path_move_to_queue(gate, from_mpath, copy); | |
684 | from_mpath = gate; | |
5ee68e5b JC |
685 | copy = true; |
686 | } else { | |
bdcbd8e0 | 687 | mpath_dbg(sdata, |
d671b2a0 | 688 | "Not forwarding to %pM (flags %#x)\n", |
947c2a0e | 689 | gate->dst, gate->flags); |
5ee68e5b JC |
690 | } |
691 | } | |
692 | ||
18b27ff7 | 693 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
947c2a0e BC |
694 | mpath_dbg(sdata, "Sending to %pM\n", gate->dst); |
695 | mesh_path_tx_pending(gate); | |
2bdaf386 | 696 | } |
60854fd9 | 697 | rcu_read_unlock(); |
5ee68e5b JC |
698 | |
699 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; | |
700 | } | |
701 | ||
eb2b9311 LCC |
702 | /** |
703 | * mesh_path_discard_frame - discard a frame whose path could not be resolved | |
704 | * | |
705 | * @skb: frame to discard | |
f698d856 | 706 | * @sdata: network subif the frame was to be sent through |
eb2b9311 | 707 | * |
eb2b9311 LCC |
708 | * Locking: the function must me called within a rcu_read_lock region |
709 | */ | |
bf7cd94d JB |
710 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
711 | struct sk_buff *skb) | |
eb2b9311 | 712 | { |
eb2b9311 | 713 | kfree_skb(skb); |
472dbc45 | 714 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
eb2b9311 LCC |
715 | } |
716 | ||
717 | /** | |
718 | * mesh_path_flush_pending - free the pending queue of a mesh path | |
719 | * | |
720 | * @mpath: mesh path whose queue has to be freed | |
721 | * | |
25985edc | 722 | * Locking: the function must me called within a rcu_read_lock region |
eb2b9311 LCC |
723 | */ |
724 | void mesh_path_flush_pending(struct mesh_path *mpath) | |
725 | { | |
eb2b9311 LCC |
726 | struct sk_buff *skb; |
727 | ||
00e3f25c | 728 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
bf7cd94d | 729 | mesh_path_discard_frame(mpath->sdata, skb); |
eb2b9311 LCC |
730 | } |
731 | ||
732 | /** | |
733 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path | |
734 | * | |
735 | * @mpath: the mesh path to modify | |
736 | * @next_hop: the next hop to force | |
737 | * | |
738 | * Locking: this function must be called holding mpath->state_lock | |
739 | */ | |
740 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) | |
741 | { | |
742 | spin_lock_bh(&mpath->state_lock); | |
743 | mesh_path_assign_nexthop(mpath, next_hop); | |
d19b3bf6 | 744 | mpath->sn = 0xffff; |
eb2b9311 LCC |
745 | mpath->metric = 0; |
746 | mpath->hop_count = 0; | |
747 | mpath->exp_time = 0; | |
5df20f21 | 748 | mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; |
eb2b9311 LCC |
749 | mesh_path_activate(mpath); |
750 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
751 | ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); |
752 | /* init it at a low value - 0 start is tricky */ | |
753 | ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); | |
eb2b9311 LCC |
754 | mesh_path_tx_pending(mpath); |
755 | } | |
756 | ||
226825f1 | 757 | void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 758 | { |
226825f1 PS |
759 | mesh_table_init(&sdata->u.mesh.mesh_paths); |
760 | mesh_table_init(&sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
761 | } |
762 | ||
60854fd9 BC |
763 | static |
764 | void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, | |
765 | struct mesh_table *tbl) | |
eb2b9311 LCC |
766 | { |
767 | struct mesh_path *mpath; | |
b4c3fbe6 | 768 | struct hlist_node *n; |
eb2b9311 | 769 | |
b4c3fbe6 HX |
770 | spin_lock_bh(&tbl->walk_lock); |
771 | hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { | |
eb2b9311 LCC |
772 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
773 | (!(mpath->flags & MESH_PATH_FIXED)) && | |
f5e50cd0 | 774 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
60854fd9 | 775 | __mesh_path_del(tbl, mpath); |
ab1c7906 | 776 | } |
b4c3fbe6 | 777 | spin_unlock_bh(&tbl->walk_lock); |
60854fd9 | 778 | } |
ab1c7906 | 779 | |
60854fd9 BC |
780 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
781 | { | |
226825f1 PS |
782 | mesh_path_tbl_expire(sdata, &sdata->u.mesh.mesh_paths); |
783 | mesh_path_tbl_expire(sdata, &sdata->u.mesh.mpp_paths); | |
eb2b9311 LCC |
784 | } |
785 | ||
2bdaf386 | 786 | void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) |
eb2b9311 | 787 | { |
226825f1 PS |
788 | mesh_table_free(&sdata->u.mesh.mesh_paths); |
789 | mesh_table_free(&sdata->u.mesh.mpp_paths); | |
eb2b9311 | 790 | } |