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1 | /* |
2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
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 | #include <linux/gfp.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/random.h> |
12 | #include "ieee80211_i.h" |
13 | #include "rate.h" |
14 | #include "mesh.h" |
15 | |
16 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
17 | #define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args) |
18 | #else |
19 | #define mpl_dbg(fmt, args...) do { (void)(0); } while (0) |
20 | #endif |
21 | |
22 | #define PLINK_GET_LLID(p) (p + 4) |
23 | #define PLINK_GET_PLID(p) (p + 6) |
24 | |
25 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ |
26 | jiffies + HZ * t / 1000)) |
27 | |
28 | /* Peer link cancel reasons, all subject to ANA approval */ |
29 | #define MESH_LINK_CANCELLED 2 |
30 | #define MESH_MAX_NEIGHBORS 3 |
31 | #define MESH_CAPABILITY_POLICY_VIOLATION 4 |
32 | #define MESH_CLOSE_RCVD 5 |
33 | #define MESH_MAX_RETRIES 6 |
34 | #define MESH_CONFIRM_TIMEOUT 7 |
35 | #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS 8 |
36 | #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9 |
37 | #define MESH_SECURITY_FAILED_VERIFICATION 10 |
38 | |
39 | #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) |
40 | #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) |
41 | #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) |
42 | #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) |
43 | #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) |
44 | |
45 | enum plink_frame_type { |
46 | PLINK_OPEN = 0, |
47 | PLINK_CONFIRM, |
48 | PLINK_CLOSE |
49 | }; |
50 | |
51 | enum plink_event { |
52 | PLINK_UNDEFINED, |
53 | OPN_ACPT, |
54 | OPN_RJCT, |
55 | OPN_IGNR, |
56 | CNF_ACPT, |
57 | CNF_RJCT, |
58 | CNF_IGNR, |
59 | CLS_ACPT, |
60 | CLS_IGNR |
61 | }; |
62 | |
63 | static inline |
64 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) |
65 | { |
66 | atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); |
67 | mesh_accept_plinks_update(sdata); |
68 | } |
69 | |
70 | static inline |
71 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) |
72 | { |
73 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
74 | mesh_accept_plinks_update(sdata); |
75 | } |
76 | |
77 | /** |
78 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine |
79 | * |
80 | * @sta: mesh peer link to restart |
81 | * |
82 | * Locking: this function must be called holding sta->lock |
83 | */ |
84 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) |
85 | { |
86 | sta->plink_state = PLINK_LISTEN; |
87 | sta->llid = sta->plid = sta->reason = 0; |
88 | sta->plink_retries = 0; |
89 | } |
90 | |
91 | /* |
92 | * NOTE: This is just an alias for sta_info_alloc(), see notes |
93 | * on it in the lifecycle management section! |
94 | */ |
95 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
96 | u8 *hw_addr, u32 rates) |
97 | { |
98 | struct ieee80211_local *local = sdata->local; |
99 | struct sta_info *sta; |
100 | |
101 | if (local->num_sta >= MESH_MAX_PLINKS) |
102 | return NULL; |
103 | |
104 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
105 | if (!sta) |
106 | return NULL; |
107 | |
108 | sta->flags = WLAN_STA_AUTHORIZED; |
109 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
110 | rate_control_rate_init(sta); |
111 | |
112 | return sta; |
113 | } |
114 | |
115 | /** |
116 | * __mesh_plink_deactivate - deactivate mesh peer link |
117 | * |
118 | * @sta: mesh peer link to deactivate |
119 | * |
120 | * All mesh paths with this peer as next hop will be flushed |
121 | * |
122 | * Locking: the caller must hold sta->lock |
123 | */ |
124 | static bool __mesh_plink_deactivate(struct sta_info *sta) |
125 | { |
126 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
127 | bool deactivated = false; |
128 | |
129 | if (sta->plink_state == PLINK_ESTAB) { |
130 | mesh_plink_dec_estab_count(sdata); |
131 | deactivated = true; |
132 | } |
133 | sta->plink_state = PLINK_BLOCKED; |
134 | mesh_path_flush_by_nexthop(sta); |
135 | |
136 | return deactivated; |
137 | } |
138 | |
139 | /** |
140 | * mesh_plink_deactivate - deactivate mesh peer link |
141 | * |
142 | * @sta: mesh peer link to deactivate |
143 | * |
144 | * All mesh paths with this peer as next hop will be flushed |
145 | */ |
146 | void mesh_plink_deactivate(struct sta_info *sta) |
147 | { |
148 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
149 | bool deactivated; |
150 | |
151 | spin_lock_bh(&sta->lock); |
152 | deactivated = __mesh_plink_deactivate(sta); |
153 | spin_unlock_bh(&sta->lock); |
154 | |
155 | if (deactivated) |
156 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
157 | } |
158 | |
159 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
160 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
161 | __le16 reason) { |
162 | struct ieee80211_local *local = sdata->local; |
163 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
164 | struct ieee80211_mgmt *mgmt; |
165 | bool include_plid = false; |
166 | static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A }; |
167 | u8 *pos; |
168 | int ie_len; |
169 | |
170 | if (!skb) |
171 | return -1; |
172 | skb_reserve(skb, local->hw.extra_tx_headroom); |
173 | /* 25 is the size of the common mgmt part (24) plus the size of the |
174 | * common action part (1) |
175 | */ |
176 | mgmt = (struct ieee80211_mgmt *) |
177 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); |
178 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); |
179 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
180 | IEEE80211_STYPE_ACTION); |
181 | memcpy(mgmt->da, da, ETH_ALEN); |
182 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
183 | /* BSSID is left zeroed, wildcard value */ |
184 | mgmt->u.action.category = WLAN_CATEGORY_MESH_PLINK; |
185 | mgmt->u.action.u.plink_action.action_code = action; |
186 | |
187 | if (action == PLINK_CLOSE) |
188 | mgmt->u.action.u.plink_action.aux = reason; |
189 | else { |
190 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); |
191 | if (action == PLINK_CONFIRM) { |
192 | pos = skb_put(skb, 4); |
193 | /* two-byte status code followed by two-byte AID */ |
194 | memset(pos, 0, 2); |
195 | memcpy(pos + 2, &plid, 2); |
196 | } |
197 | mesh_mgmt_ies_add(skb, sdata); |
198 | } |
199 | |
200 | /* Add Peer Link Management element */ |
201 | switch (action) { |
202 | case PLINK_OPEN: |
203 | ie_len = 6; |
204 | break; |
205 | case PLINK_CONFIRM: |
206 | ie_len = 8; |
207 | include_plid = true; |
208 | break; |
209 | case PLINK_CLOSE: |
210 | default: |
211 | if (!plid) |
212 | ie_len = 8; |
213 | else { |
214 | ie_len = 10; |
215 | include_plid = true; |
216 | } |
217 | break; |
218 | } |
219 | |
220 | pos = skb_put(skb, 2 + ie_len); |
221 | *pos++ = WLAN_EID_PEER_LINK; |
222 | *pos++ = ie_len; |
223 | memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto)); |
224 | pos += 4; |
225 | memcpy(pos, &llid, 2); |
226 | if (include_plid) { |
227 | pos += 2; |
228 | memcpy(pos, &plid, 2); |
229 | } |
230 | if (action == PLINK_CLOSE) { |
231 | pos += 2; |
232 | memcpy(pos, &reason, 2); |
233 | } |
234 | |
235 | ieee80211_tx_skb(sdata, skb); |
236 | return 0; |
237 | } |
238 | |
239 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata, |
240 | bool peer_accepting_plinks) |
241 | { |
242 | struct ieee80211_local *local = sdata->local; |
243 | struct sta_info *sta; |
244 | |
245 | rcu_read_lock(); |
246 | |
247 | sta = sta_info_get(sdata, hw_addr); |
248 | if (!sta) { |
249 | rcu_read_unlock(); |
250 | |
251 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
252 | if (!sta) |
253 | return; |
254 | if (sta_info_insert_rcu(sta)) { |
255 | rcu_read_unlock(); |
256 | return; |
257 | } |
258 | } |
259 | |
260 | sta->last_rx = jiffies; |
261 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
262 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
263 | sdata->u.mesh.accepting_plinks && |
264 | sdata->u.mesh.mshcfg.auto_open_plinks) |
265 | mesh_plink_open(sta); |
266 | |
267 | rcu_read_unlock(); |
268 | } |
269 | |
270 | static void mesh_plink_timer(unsigned long data) |
271 | { |
272 | struct sta_info *sta; |
273 | __le16 llid, plid, reason; |
274 | struct ieee80211_sub_if_data *sdata; |
275 | |
276 | /* |
277 | * This STA is valid because sta_info_destroy() will |
278 | * del_timer_sync() this timer after having made sure |
279 | * it cannot be readded (by deleting the plink.) |
280 | */ |
281 | sta = (struct sta_info *) data; |
282 | |
283 | if (sta->sdata->local->quiescing) { |
284 | sta->plink_timer_was_running = true; |
285 | return; |
286 | } |
287 | |
288 | spin_lock_bh(&sta->lock); |
289 | if (sta->ignore_plink_timer) { |
290 | sta->ignore_plink_timer = false; |
291 | spin_unlock_bh(&sta->lock); |
292 | return; |
293 | } |
294 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
295 | sta->sta.addr, sta->plink_state); |
296 | reason = 0; |
297 | llid = sta->llid; |
298 | plid = sta->plid; |
299 | sdata = sta->sdata; |
300 | |
301 | switch (sta->plink_state) { |
302 | case PLINK_OPN_RCVD: |
303 | case PLINK_OPN_SNT: |
304 | /* retry timer */ |
305 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { |
306 | u32 rand; |
307 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
308 | sta->sta.addr, sta->plink_retries, |
309 | sta->plink_timeout); |
310 | get_random_bytes(&rand, sizeof(u32)); |
311 | sta->plink_timeout = sta->plink_timeout + |
312 | rand % sta->plink_timeout; |
313 | ++sta->plink_retries; |
314 | mod_plink_timer(sta, sta->plink_timeout); |
315 | spin_unlock_bh(&sta->lock); |
316 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
317 | 0, 0); |
318 | break; |
319 | } |
320 | reason = cpu_to_le16(MESH_MAX_RETRIES); |
321 | /* fall through on else */ |
322 | case PLINK_CNF_RCVD: |
323 | /* confirm timer */ |
324 | if (!reason) |
325 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); |
326 | sta->plink_state = PLINK_HOLDING; |
327 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
328 | spin_unlock_bh(&sta->lock); |
329 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, |
330 | reason); |
331 | break; |
332 | case PLINK_HOLDING: |
333 | /* holding timer */ |
334 | del_timer(&sta->plink_timer); |
335 | mesh_plink_fsm_restart(sta); |
336 | spin_unlock_bh(&sta->lock); |
337 | break; |
338 | default: |
339 | spin_unlock_bh(&sta->lock); |
340 | break; |
341 | } |
342 | } |
343 | |
344 | #ifdef CONFIG_PM |
345 | void mesh_plink_quiesce(struct sta_info *sta) |
346 | { |
347 | if (del_timer_sync(&sta->plink_timer)) |
348 | sta->plink_timer_was_running = true; |
349 | } |
350 | |
351 | void mesh_plink_restart(struct sta_info *sta) |
352 | { |
353 | if (sta->plink_timer_was_running) { |
354 | add_timer(&sta->plink_timer); |
355 | sta->plink_timer_was_running = false; |
356 | } |
357 | } |
358 | #endif |
359 | |
360 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
361 | { |
362 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); |
363 | sta->plink_timer.data = (unsigned long) sta; |
364 | sta->plink_timer.function = mesh_plink_timer; |
365 | sta->plink_timeout = timeout; |
366 | add_timer(&sta->plink_timer); |
367 | } |
368 | |
369 | int mesh_plink_open(struct sta_info *sta) |
370 | { |
371 | __le16 llid; |
372 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
373 | |
374 | spin_lock_bh(&sta->lock); |
375 | get_random_bytes(&llid, 2); |
376 | sta->llid = llid; |
377 | if (sta->plink_state != PLINK_LISTEN) { |
378 | spin_unlock_bh(&sta->lock); |
379 | return -EBUSY; |
380 | } |
381 | sta->plink_state = PLINK_OPN_SNT; |
382 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
383 | spin_unlock_bh(&sta->lock); |
384 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
385 | sta->sta.addr); |
386 | |
387 | return mesh_plink_frame_tx(sdata, PLINK_OPEN, |
388 | sta->sta.addr, llid, 0, 0); |
389 | } |
390 | |
391 | void mesh_plink_block(struct sta_info *sta) |
392 | { |
393 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
394 | bool deactivated; |
395 | |
396 | spin_lock_bh(&sta->lock); |
397 | deactivated = __mesh_plink_deactivate(sta); |
398 | sta->plink_state = PLINK_BLOCKED; |
399 | spin_unlock_bh(&sta->lock); |
400 | |
401 | if (deactivated) |
402 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
403 | } |
404 | |
405 | |
406 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
407 | size_t len, struct ieee80211_rx_status *rx_status) |
408 | { |
409 | struct ieee80211_local *local = sdata->local; |
410 | struct ieee802_11_elems elems; |
411 | struct sta_info *sta; |
412 | enum plink_event event; |
413 | enum plink_frame_type ftype; |
414 | size_t baselen; |
415 | bool deactivated; |
416 | u8 ie_len; |
417 | u8 *baseaddr; |
418 | __le16 plid, llid, reason; |
419 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
420 | static const char *mplstates[] = { |
421 | [PLINK_LISTEN] = "LISTEN", |
422 | [PLINK_OPN_SNT] = "OPN-SNT", |
423 | [PLINK_OPN_RCVD] = "OPN-RCVD", |
424 | [PLINK_CNF_RCVD] = "CNF_RCVD", |
425 | [PLINK_ESTAB] = "ESTAB", |
426 | [PLINK_HOLDING] = "HOLDING", |
427 | [PLINK_BLOCKED] = "BLOCKED" |
428 | }; |
429 | #endif |
430 | |
431 | /* need action_code, aux */ |
432 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) |
433 | return; |
434 | |
435 | if (is_multicast_ether_addr(mgmt->da)) { |
436 | mpl_dbg("Mesh plink: ignore frame from multicast address"); |
437 | return; |
438 | } |
439 | |
440 | baseaddr = mgmt->u.action.u.plink_action.variable; |
441 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; |
442 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { |
443 | baseaddr += 4; |
444 | baselen += 4; |
445 | } |
446 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); |
447 | if (!elems.peer_link) { |
448 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
449 | return; |
450 | } |
451 | |
452 | ftype = mgmt->u.action.u.plink_action.action_code; |
453 | ie_len = elems.peer_link_len; |
454 | if ((ftype == PLINK_OPEN && ie_len != 6) || |
455 | (ftype == PLINK_CONFIRM && ie_len != 8) || |
456 | (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) { |
457 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", |
458 | ftype, ie_len); |
459 | return; |
460 | } |
461 | |
462 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { |
463 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
464 | return; |
465 | } |
466 | /* Note the lines below are correct, the llid in the frame is the plid |
467 | * from the point of view of this host. |
468 | */ |
469 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); |
470 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10)) |
471 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); |
472 | |
473 | rcu_read_lock(); |
474 | |
475 | sta = sta_info_get(sdata, mgmt->sa); |
476 | if (!sta && ftype != PLINK_OPEN) { |
477 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
478 | rcu_read_unlock(); |
479 | return; |
480 | } |
481 | |
482 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
483 | rcu_read_unlock(); |
484 | return; |
485 | } |
486 | |
487 | /* Now we will figure out the appropriate event... */ |
488 | event = PLINK_UNDEFINED; |
489 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) { |
490 | switch (ftype) { |
491 | case PLINK_OPEN: |
492 | event = OPN_RJCT; |
493 | break; |
494 | case PLINK_CONFIRM: |
495 | event = CNF_RJCT; |
496 | break; |
497 | case PLINK_CLOSE: |
498 | /* avoid warning */ |
499 | break; |
500 | } |
501 | spin_lock_bh(&sta->lock); |
502 | } else if (!sta) { |
503 | /* ftype == PLINK_OPEN */ |
504 | u32 rates; |
505 | |
506 | rcu_read_unlock(); |
507 | |
508 | if (!mesh_plink_free_count(sdata)) { |
509 | mpl_dbg("Mesh plink error: no more free plinks\n"); |
510 | return; |
511 | } |
512 | |
513 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); |
514 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
515 | if (!sta) { |
516 | mpl_dbg("Mesh plink error: plink table full\n"); |
517 | return; |
518 | } |
519 | if (sta_info_insert_rcu(sta)) { |
520 | rcu_read_unlock(); |
521 | return; |
522 | } |
523 | event = OPN_ACPT; |
524 | spin_lock_bh(&sta->lock); |
525 | } else { |
526 | spin_lock_bh(&sta->lock); |
527 | switch (ftype) { |
528 | case PLINK_OPEN: |
529 | if (!mesh_plink_free_count(sdata) || |
530 | (sta->plid && sta->plid != plid)) |
531 | event = OPN_IGNR; |
532 | else |
533 | event = OPN_ACPT; |
534 | break; |
535 | case PLINK_CONFIRM: |
536 | if (!mesh_plink_free_count(sdata) || |
537 | (sta->llid != llid || sta->plid != plid)) |
538 | event = CNF_IGNR; |
539 | else |
540 | event = CNF_ACPT; |
541 | break; |
542 | case PLINK_CLOSE: |
543 | if (sta->plink_state == PLINK_ESTAB) |
544 | /* Do not check for llid or plid. This does not |
545 | * follow the standard but since multiple plinks |
546 | * per sta are not supported, it is necessary in |
547 | * order to avoid a livelock when MP A sees an |
548 | * establish peer link to MP B but MP B does not |
549 | * see it. This can be caused by a timeout in |
550 | * B's peer link establishment or B beign |
551 | * restarted. |
552 | */ |
553 | event = CLS_ACPT; |
554 | else if (sta->plid != plid) |
555 | event = CLS_IGNR; |
556 | else if (ie_len == 7 && sta->llid != llid) |
557 | event = CLS_IGNR; |
558 | else |
559 | event = CLS_ACPT; |
560 | break; |
561 | default: |
562 | mpl_dbg("Mesh plink: unknown frame subtype\n"); |
563 | spin_unlock_bh(&sta->lock); |
564 | rcu_read_unlock(); |
565 | return; |
566 | } |
567 | } |
568 | |
569 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
570 | mgmt->sa, mplstates[sta->plink_state], |
571 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
572 | event); |
573 | reason = 0; |
574 | switch (sta->plink_state) { |
575 | /* spin_unlock as soon as state is updated at each case */ |
576 | case PLINK_LISTEN: |
577 | switch (event) { |
578 | case CLS_ACPT: |
579 | mesh_plink_fsm_restart(sta); |
580 | spin_unlock_bh(&sta->lock); |
581 | break; |
582 | case OPN_ACPT: |
583 | sta->plink_state = PLINK_OPN_RCVD; |
584 | sta->plid = plid; |
585 | get_random_bytes(&llid, 2); |
586 | sta->llid = llid; |
587 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
588 | spin_unlock_bh(&sta->lock); |
589 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
590 | 0, 0); |
591 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, |
592 | llid, plid, 0); |
593 | break; |
594 | default: |
595 | spin_unlock_bh(&sta->lock); |
596 | break; |
597 | } |
598 | break; |
599 | |
600 | case PLINK_OPN_SNT: |
601 | switch (event) { |
602 | case OPN_RJCT: |
603 | case CNF_RJCT: |
604 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
605 | case CLS_ACPT: |
606 | if (!reason) |
607 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
608 | sta->reason = reason; |
609 | sta->plink_state = PLINK_HOLDING; |
610 | if (!mod_plink_timer(sta, |
611 | dot11MeshHoldingTimeout(sdata))) |
612 | sta->ignore_plink_timer = true; |
613 | |
614 | llid = sta->llid; |
615 | spin_unlock_bh(&sta->lock); |
616 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
617 | plid, reason); |
618 | break; |
619 | case OPN_ACPT: |
620 | /* retry timer is left untouched */ |
621 | sta->plink_state = PLINK_OPN_RCVD; |
622 | sta->plid = plid; |
623 | llid = sta->llid; |
624 | spin_unlock_bh(&sta->lock); |
625 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
626 | plid, 0); |
627 | break; |
628 | case CNF_ACPT: |
629 | sta->plink_state = PLINK_CNF_RCVD; |
630 | if (!mod_plink_timer(sta, |
631 | dot11MeshConfirmTimeout(sdata))) |
632 | sta->ignore_plink_timer = true; |
633 | |
634 | spin_unlock_bh(&sta->lock); |
635 | break; |
636 | default: |
637 | spin_unlock_bh(&sta->lock); |
638 | break; |
639 | } |
640 | break; |
641 | |
642 | case PLINK_OPN_RCVD: |
643 | switch (event) { |
644 | case OPN_RJCT: |
645 | case CNF_RJCT: |
646 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
647 | case CLS_ACPT: |
648 | if (!reason) |
649 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
650 | sta->reason = reason; |
651 | sta->plink_state = PLINK_HOLDING; |
652 | if (!mod_plink_timer(sta, |
653 | dot11MeshHoldingTimeout(sdata))) |
654 | sta->ignore_plink_timer = true; |
655 | |
656 | llid = sta->llid; |
657 | spin_unlock_bh(&sta->lock); |
658 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
659 | plid, reason); |
660 | break; |
661 | case OPN_ACPT: |
662 | llid = sta->llid; |
663 | spin_unlock_bh(&sta->lock); |
664 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
665 | plid, 0); |
666 | break; |
667 | case CNF_ACPT: |
668 | del_timer(&sta->plink_timer); |
669 | sta->plink_state = PLINK_ESTAB; |
670 | spin_unlock_bh(&sta->lock); |
671 | mesh_plink_inc_estab_count(sdata); |
672 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
673 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
674 | sta->sta.addr); |
675 | break; |
676 | default: |
677 | spin_unlock_bh(&sta->lock); |
678 | break; |
679 | } |
680 | break; |
681 | |
682 | case PLINK_CNF_RCVD: |
683 | switch (event) { |
684 | case OPN_RJCT: |
685 | case CNF_RJCT: |
686 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
687 | case CLS_ACPT: |
688 | if (!reason) |
689 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
690 | sta->reason = reason; |
691 | sta->plink_state = PLINK_HOLDING; |
692 | if (!mod_plink_timer(sta, |
693 | dot11MeshHoldingTimeout(sdata))) |
694 | sta->ignore_plink_timer = true; |
695 | |
696 | llid = sta->llid; |
697 | spin_unlock_bh(&sta->lock); |
698 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
699 | plid, reason); |
700 | break; |
701 | case OPN_ACPT: |
702 | del_timer(&sta->plink_timer); |
703 | sta->plink_state = PLINK_ESTAB; |
704 | spin_unlock_bh(&sta->lock); |
705 | mesh_plink_inc_estab_count(sdata); |
706 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
707 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
708 | sta->sta.addr); |
709 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
710 | plid, 0); |
711 | break; |
712 | default: |
713 | spin_unlock_bh(&sta->lock); |
714 | break; |
715 | } |
716 | break; |
717 | |
718 | case PLINK_ESTAB: |
719 | switch (event) { |
720 | case CLS_ACPT: |
721 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
722 | sta->reason = reason; |
723 | deactivated = __mesh_plink_deactivate(sta); |
724 | sta->plink_state = PLINK_HOLDING; |
725 | llid = sta->llid; |
726 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
727 | spin_unlock_bh(&sta->lock); |
728 | if (deactivated) |
729 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
730 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
731 | plid, reason); |
732 | break; |
733 | case OPN_ACPT: |
734 | llid = sta->llid; |
735 | spin_unlock_bh(&sta->lock); |
736 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
737 | plid, 0); |
738 | break; |
739 | default: |
740 | spin_unlock_bh(&sta->lock); |
741 | break; |
742 | } |
743 | break; |
744 | case PLINK_HOLDING: |
745 | switch (event) { |
746 | case CLS_ACPT: |
747 | if (del_timer(&sta->plink_timer)) |
748 | sta->ignore_plink_timer = 1; |
749 | mesh_plink_fsm_restart(sta); |
750 | spin_unlock_bh(&sta->lock); |
751 | break; |
752 | case OPN_ACPT: |
753 | case CNF_ACPT: |
754 | case OPN_RJCT: |
755 | case CNF_RJCT: |
756 | llid = sta->llid; |
757 | reason = sta->reason; |
758 | spin_unlock_bh(&sta->lock); |
759 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, |
760 | llid, plid, reason); |
761 | break; |
762 | default: |
763 | spin_unlock_bh(&sta->lock); |
764 | } |
765 | break; |
766 | default: |
767 | /* should not get here, PLINK_BLOCKED is dealt with at the |
768 | * beginning of the function |
769 | */ |
770 | spin_unlock_bh(&sta->lock); |
771 | break; |
772 | } |
773 | |
774 | rcu_read_unlock(); |
775 | } |
776 |
Branches:
ben-wpan
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javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9