Commit | Line | Data |
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c3896d2c LCC |
1 | /* |
2 | * Copyright (c) 2008 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 | ||
10 | #include "ieee80211_i.h" | |
11 | #include "ieee80211_rate.h" | |
12 | #include "mesh.h" | |
13 | #include <linux/random.h> | |
14 | ||
15 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
16 | #define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args) | |
17 | #else | |
18 | #define mpl_dbg(fmt, args...) do { (void)(0); } while (0) | |
19 | #endif | |
20 | ||
21 | #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype) | |
22 | #define PLINK_GET_FRAME_SUBTYPE(p) (p) | |
23 | #define PLINK_GET_LLID(p) (p + 1) | |
24 | #define PLINK_GET_PLID(p) (p + 3) | |
25 | ||
26 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
27 | jiffies + HZ * t / 1000)) | |
28 | ||
29 | /* Peer link cancel reasons, all subject to ANA approval */ | |
30 | #define MESH_LINK_CANCELLED 2 | |
31 | #define MESH_MAX_NEIGHBORS 3 | |
32 | #define MESH_CAPABILITY_POLICY_VIOLATION 4 | |
33 | #define MESH_CLOSE_RCVD 5 | |
34 | #define MESH_MAX_RETRIES 6 | |
35 | #define MESH_CONFIRM_TIMEOUT 7 | |
36 | #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS 8 | |
37 | #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9 | |
38 | #define MESH_SECURITY_FAILED_VERIFICATION 10 | |
39 | ||
40 | #define dot11MeshMaxRetries(s) (s->u.sta.mshcfg.dot11MeshMaxRetries) | |
41 | #define dot11MeshRetryTimeout(s) (s->u.sta.mshcfg.dot11MeshRetryTimeout) | |
42 | #define dot11MeshConfirmTimeout(s) (s->u.sta.mshcfg.dot11MeshConfirmTimeout) | |
43 | #define dot11MeshHoldingTimeout(s) (s->u.sta.mshcfg.dot11MeshHoldingTimeout) | |
44 | #define dot11MeshMaxPeerLinks(s) (s->u.sta.mshcfg.dot11MeshMaxPeerLinks) | |
45 | ||
46 | enum plink_frame_type { | |
47 | PLINK_OPEN = 0, | |
48 | PLINK_CONFIRM, | |
49 | PLINK_CLOSE | |
50 | }; | |
51 | ||
52 | enum plink_event { | |
53 | PLINK_UNDEFINED, | |
54 | OPN_ACPT, | |
55 | OPN_RJCT, | |
56 | OPN_IGNR, | |
57 | CNF_ACPT, | |
58 | CNF_RJCT, | |
59 | CNF_IGNR, | |
60 | CLS_ACPT, | |
61 | CLS_IGNR | |
62 | }; | |
63 | ||
64 | static inline | |
65 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
66 | { | |
67 | atomic_inc(&sdata->u.sta.mshstats.estab_plinks); | |
68 | mesh_accept_plinks_update(sdata->dev); | |
69 | } | |
70 | ||
71 | static inline | |
72 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
73 | { | |
74 | atomic_dec(&sdata->u.sta.mshstats.estab_plinks); | |
75 | mesh_accept_plinks_update(sdata->dev); | |
76 | } | |
77 | ||
78 | /** | |
79 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
80 | * | |
81 | * @sta: mes peer link to restart | |
82 | * | |
83 | * Locking: this function must be called holding sta->plink_lock | |
84 | */ | |
85 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
86 | { | |
87 | sta->plink_state = LISTEN; | |
88 | sta->llid = sta->plid = sta->reason = sta->plink_retries = 0; | |
89 | } | |
90 | ||
91 | /** | |
92 | * mesh_plink_add - allocate and add a new mesh peer link | |
93 | * | |
94 | * @hw_addr: hardware address (ETH_ALEN length) | |
95 | * @rates: rates the mesh peer supports | |
96 | * @dev: local mesh interface | |
97 | * | |
98 | * The initial state of the new plink is set to LISTEN | |
99 | * | |
100 | * Returns: non-NULL on success, ERR_PTR() on error. | |
101 | */ | |
102 | struct sta_info *mesh_plink_add(u8 *hw_addr, u64 rates, struct net_device *dev) | |
103 | { | |
104 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
105 | struct sta_info *sta; | |
106 | ||
107 | if (memcmp(hw_addr, dev->dev_addr, ETH_ALEN) == 0) | |
108 | /* never add ourselves as neighbours */ | |
109 | return ERR_PTR(-EINVAL); | |
110 | ||
111 | if (is_multicast_ether_addr(hw_addr)) | |
112 | return ERR_PTR(-EINVAL); | |
113 | ||
114 | if (local->num_sta >= MESH_MAX_PLINKS) | |
115 | return ERR_PTR(-ENOSPC); | |
116 | ||
117 | sta = sta_info_add(local, dev, hw_addr, GFP_KERNEL); | |
118 | if (IS_ERR(sta)) | |
119 | return sta; | |
120 | ||
121 | sta->plink_state = LISTEN; | |
122 | spin_lock_init(&sta->plink_lock); | |
123 | init_timer(&sta->plink_timer); | |
124 | sta->flags |= WLAN_STA_AUTHORIZED; | |
125 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
126 | rate_control_rate_init(sta, local); | |
127 | ||
128 | mesh_accept_plinks_update(dev); | |
129 | ||
130 | return sta; | |
131 | } | |
132 | ||
133 | /** | |
134 | * mesh_plink_deactivate - deactivate mesh peer link | |
135 | * | |
136 | * @sta: mesh peer link to deactivate | |
137 | * | |
138 | * All mesh paths with this peer as next hop will be flushed | |
139 | * | |
140 | * Locking: the caller must hold sta->plink_lock | |
141 | */ | |
142 | void mesh_plink_deactivate(struct sta_info *sta) | |
143 | { | |
144 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
145 | if (sta->plink_state == ESTAB) | |
146 | mesh_plink_dec_estab_count(sdata); | |
147 | sta->plink_state = BLOCKED; | |
148 | mesh_path_flush_by_nexthop(sta); | |
149 | } | |
150 | ||
151 | static int mesh_plink_frame_tx(struct net_device *dev, | |
152 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, | |
153 | __le16 reason) { | |
154 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
155 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); | |
156 | struct ieee80211_mgmt *mgmt; | |
157 | bool include_plid = false; | |
158 | u8 *pos; | |
159 | int ie_len; | |
160 | ||
161 | if (!skb) | |
162 | return -1; | |
163 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
164 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
165 | * common action part (1) | |
166 | */ | |
167 | mgmt = (struct ieee80211_mgmt *) | |
168 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
169 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
170 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
171 | IEEE80211_STYPE_ACTION); | |
172 | memcpy(mgmt->da, da, ETH_ALEN); | |
173 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); | |
174 | /* BSSID is left zeroed, wildcard value */ | |
175 | mgmt->u.action.category = PLINK_CATEGORY; | |
176 | mgmt->u.action.u.plink_action.action_code = action; | |
177 | ||
178 | if (action == PLINK_CLOSE) | |
179 | mgmt->u.action.u.plink_action.aux = reason; | |
180 | else { | |
181 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
182 | if (action == PLINK_CONFIRM) { | |
183 | pos = skb_put(skb, 4); | |
184 | /* two-byte status code followed by two-byte AID */ | |
185 | memset(pos, 0, 4); | |
186 | } | |
187 | mesh_mgmt_ies_add(skb, dev); | |
188 | } | |
189 | ||
190 | /* Add Peer Link Management element */ | |
191 | switch (action) { | |
192 | case PLINK_OPEN: | |
193 | ie_len = 3; | |
194 | break; | |
195 | case PLINK_CONFIRM: | |
196 | ie_len = 5; | |
197 | include_plid = true; | |
198 | break; | |
199 | case PLINK_CLOSE: | |
200 | default: | |
201 | if (!plid) | |
202 | ie_len = 5; | |
203 | else { | |
204 | ie_len = 7; | |
205 | include_plid = true; | |
206 | } | |
207 | break; | |
208 | } | |
209 | ||
210 | pos = skb_put(skb, 2 + ie_len); | |
211 | *pos++ = WLAN_EID_PEER_LINK; | |
212 | *pos++ = ie_len; | |
213 | *pos++ = action; | |
214 | memcpy(pos, &llid, 2); | |
215 | if (include_plid) { | |
216 | pos += 2; | |
217 | memcpy(pos, &plid, 2); | |
218 | } | |
219 | if (action == PLINK_CLOSE) { | |
220 | pos += 2; | |
221 | memcpy(pos, &reason, 2); | |
222 | } | |
223 | ||
224 | ieee80211_sta_tx(dev, skb, 0); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, | |
229 | bool peer_accepting_plinks) | |
230 | { | |
231 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
232 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
233 | struct sta_info *sta; | |
234 | ||
235 | sta = sta_info_get(local, hw_addr); | |
236 | if (!sta) { | |
237 | sta = mesh_plink_add(hw_addr, rates, dev); | |
238 | if (IS_ERR(sta)) | |
239 | return; | |
240 | } | |
241 | ||
242 | sta->last_rx = jiffies; | |
243 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
244 | if (peer_accepting_plinks && sta->plink_state == LISTEN && | |
245 | sdata->u.sta.accepting_plinks && | |
246 | sdata->u.sta.mshcfg.auto_open_plinks) | |
247 | mesh_plink_open(sta); | |
248 | ||
249 | sta_info_put(sta); | |
250 | } | |
251 | ||
252 | static void mesh_plink_timer(unsigned long data) | |
253 | { | |
254 | struct sta_info *sta; | |
255 | __le16 llid, plid, reason; | |
256 | struct net_device *dev = NULL; | |
257 | struct ieee80211_sub_if_data *sdata; | |
258 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
259 | DECLARE_MAC_BUF(mac); | |
260 | #endif | |
261 | ||
262 | sta = (struct sta_info *) data; | |
263 | ||
264 | spin_lock_bh(&sta->plink_lock); | |
265 | if (sta->ignore_plink_timer) { | |
266 | sta->ignore_plink_timer = false; | |
267 | spin_unlock_bh(&sta->plink_lock); | |
268 | return; | |
269 | } | |
270 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", | |
271 | print_mac(mac, sta->addr), sta->plink_state); | |
272 | reason = 0; | |
273 | llid = sta->llid; | |
274 | plid = sta->plid; | |
275 | dev = sta->dev; | |
276 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
277 | ||
278 | switch (sta->plink_state) { | |
279 | case OPN_RCVD: | |
280 | case OPN_SNT: | |
281 | /* retry timer */ | |
282 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
283 | u32 rand; | |
284 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", | |
285 | print_mac(mac, sta->addr), | |
286 | sta->plink_retries, sta->plink_timeout); | |
287 | get_random_bytes(&rand, sizeof(u32)); | |
288 | sta->plink_timeout = sta->plink_timeout + | |
289 | rand % sta->plink_timeout; | |
290 | ++sta->plink_retries; | |
291 | if (!mod_plink_timer(sta, sta->plink_timeout)) | |
292 | __sta_info_get(sta); | |
293 | spin_unlock_bh(&sta->plink_lock); | |
294 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
295 | 0, 0); | |
296 | break; | |
297 | } | |
298 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
299 | /* fall through on else */ | |
300 | case CNF_RCVD: | |
301 | /* confirm timer */ | |
302 | if (!reason) | |
303 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
304 | sta->plink_state = HOLDING; | |
305 | if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) | |
306 | __sta_info_get(sta); | |
307 | spin_unlock_bh(&sta->plink_lock); | |
308 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, | |
309 | reason); | |
310 | break; | |
311 | case HOLDING: | |
312 | /* holding timer */ | |
313 | if (del_timer(&sta->plink_timer)) | |
314 | sta_info_put(sta); | |
315 | mesh_plink_fsm_restart(sta); | |
316 | spin_unlock_bh(&sta->plink_lock); | |
317 | break; | |
318 | default: | |
319 | spin_unlock_bh(&sta->plink_lock); | |
320 | break; | |
321 | } | |
322 | ||
323 | sta_info_put(sta); | |
324 | } | |
325 | ||
326 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) | |
327 | { | |
328 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
329 | sta->plink_timer.data = (unsigned long) sta; | |
330 | sta->plink_timer.function = mesh_plink_timer; | |
331 | sta->plink_timeout = timeout; | |
332 | __sta_info_get(sta); | |
333 | add_timer(&sta->plink_timer); | |
334 | } | |
335 | ||
336 | int mesh_plink_open(struct sta_info *sta) | |
337 | { | |
338 | __le16 llid; | |
339 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
340 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
341 | DECLARE_MAC_BUF(mac); | |
342 | #endif | |
343 | ||
344 | spin_lock_bh(&sta->plink_lock); | |
345 | get_random_bytes(&llid, 2); | |
346 | sta->llid = llid; | |
347 | if (sta->plink_state != LISTEN) { | |
348 | spin_unlock_bh(&sta->plink_lock); | |
349 | sta_info_put(sta); | |
350 | return -EBUSY; | |
351 | } | |
352 | sta->plink_state = OPN_SNT; | |
353 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
354 | spin_unlock_bh(&sta->plink_lock); | |
355 | mpl_dbg("Mesh plink: starting establishment with %s\n", | |
356 | print_mac(mac, sta->addr)); | |
357 | ||
358 | return mesh_plink_frame_tx(sta->dev, PLINK_OPEN, sta->addr, llid, 0, 0); | |
359 | } | |
360 | ||
361 | void mesh_plink_block(struct sta_info *sta) | |
362 | { | |
363 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
364 | DECLARE_MAC_BUF(mac); | |
365 | #endif | |
366 | ||
367 | spin_lock_bh(&sta->plink_lock); | |
368 | mesh_plink_deactivate(sta); | |
369 | sta->plink_state = BLOCKED; | |
370 | spin_unlock_bh(&sta->plink_lock); | |
371 | } | |
372 | ||
373 | int mesh_plink_close(struct sta_info *sta) | |
374 | { | |
375 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
376 | int llid, plid, reason; | |
377 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
378 | DECLARE_MAC_BUF(mac); | |
379 | #endif | |
380 | ||
381 | mpl_dbg("Mesh plink: closing link with %s\n", | |
382 | print_mac(mac, sta->addr)); | |
383 | spin_lock_bh(&sta->plink_lock); | |
384 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); | |
385 | reason = sta->reason; | |
386 | ||
387 | if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) { | |
388 | mesh_plink_fsm_restart(sta); | |
389 | spin_unlock_bh(&sta->plink_lock); | |
390 | sta_info_put(sta); | |
391 | return 0; | |
392 | } else if (sta->plink_state == ESTAB) { | |
393 | mesh_plink_deactivate(sta); | |
394 | /* The timer should not be running */ | |
395 | if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) | |
396 | __sta_info_get(sta); | |
397 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) | |
398 | sta->ignore_plink_timer = true; | |
399 | ||
400 | sta->plink_state = HOLDING; | |
401 | llid = sta->llid; | |
402 | plid = sta->plid; | |
403 | spin_unlock_bh(&sta->plink_lock); | |
404 | mesh_plink_frame_tx(sta->dev, PLINK_CLOSE, sta->addr, llid, plid, | |
405 | reason); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, | |
410 | size_t len, struct ieee80211_rx_status *rx_status) | |
411 | { | |
412 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
413 | struct ieee802_11_elems elems; | |
414 | struct sta_info *sta; | |
415 | enum plink_event event; | |
416 | enum plink_frame_type ftype; | |
417 | size_t baselen; | |
418 | u8 ie_len; | |
419 | u8 *baseaddr; | |
420 | __le16 plid, llid, reason; | |
421 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
422 | DECLARE_MAC_BUF(mac); | |
423 | #endif | |
424 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
425 | ||
426 | if (is_multicast_ether_addr(mgmt->da)) { | |
427 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
428 | return; | |
429 | } | |
430 | ||
431 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
432 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
433 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
434 | baseaddr += 4; | |
435 | baselen -= 4; | |
436 | } | |
437 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
438 | if (!elems.peer_link) { | |
439 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
440 | return; | |
441 | } | |
442 | ||
443 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); | |
444 | ie_len = elems.peer_link_len; | |
445 | if ((ftype == PLINK_OPEN && ie_len != 3) || | |
446 | (ftype == PLINK_CONFIRM && ie_len != 5) || | |
447 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { | |
448 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); | |
449 | return; | |
450 | } | |
451 | ||
452 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
453 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
454 | return; | |
455 | } | |
456 | /* Note the lines below are correct, the llid in the frame is the plid | |
457 | * from the point of view of this host. | |
458 | */ | |
459 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
460 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) | |
461 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); | |
462 | ||
463 | sta = sta_info_get(local, mgmt->sa); | |
464 | if (!sta && ftype != PLINK_OPEN) { | |
465 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
466 | return; | |
467 | } | |
468 | ||
469 | if (sta && sta->plink_state == BLOCKED) { | |
470 | sta_info_put(sta); | |
471 | return; | |
472 | } | |
473 | ||
474 | /* Now we will figure out the appropriate event... */ | |
475 | event = PLINK_UNDEFINED; | |
476 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { | |
477 | switch (ftype) { | |
478 | case PLINK_OPEN: | |
479 | event = OPN_RJCT; | |
480 | break; | |
481 | case PLINK_CONFIRM: | |
482 | event = CNF_RJCT; | |
483 | break; | |
484 | case PLINK_CLOSE: | |
485 | /* avoid warning */ | |
486 | break; | |
487 | } | |
488 | spin_lock_bh(&sta->plink_lock); | |
489 | } else if (!sta) { | |
490 | /* ftype == PLINK_OPEN */ | |
491 | u64 rates; | |
492 | if (!mesh_plink_free_count(sdata)) { | |
493 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
494 | return; | |
495 | } | |
496 | ||
497 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
498 | sta = mesh_plink_add(mgmt->sa, rates, dev); | |
499 | if (IS_ERR(sta)) { | |
500 | mpl_dbg("Mesh plink error: plink table full\n"); | |
501 | return; | |
502 | } | |
503 | event = OPN_ACPT; | |
504 | spin_lock_bh(&sta->plink_lock); | |
505 | } else { | |
506 | spin_lock_bh(&sta->plink_lock); | |
507 | switch (ftype) { | |
508 | case PLINK_OPEN: | |
509 | if (!mesh_plink_free_count(sdata) || | |
510 | (sta->plid && sta->plid != plid)) | |
511 | event = OPN_IGNR; | |
512 | else | |
513 | event = OPN_ACPT; | |
514 | break; | |
515 | case PLINK_CONFIRM: | |
516 | if (!mesh_plink_free_count(sdata) || | |
517 | (sta->llid != llid || sta->plid != plid)) | |
518 | event = CNF_IGNR; | |
519 | else | |
520 | event = CNF_ACPT; | |
521 | break; | |
522 | case PLINK_CLOSE: | |
523 | if (sta->plink_state == ESTAB) | |
524 | /* Do not check for llid or plid. This does not | |
525 | * follow the standard but since multiple plinks | |
526 | * per sta are not supported, it is necessary in | |
527 | * order to avoid a livelock when MP A sees an | |
528 | * establish peer link to MP B but MP B does not | |
529 | * see it. This can be caused by a timeout in | |
530 | * B's peer link establishment or B beign | |
531 | * restarted. | |
532 | */ | |
533 | event = CLS_ACPT; | |
534 | else if (sta->plid != plid) | |
535 | event = CLS_IGNR; | |
536 | else if (ie_len == 7 && sta->llid != llid) | |
537 | event = CLS_IGNR; | |
538 | else | |
539 | event = CLS_ACPT; | |
540 | break; | |
541 | default: | |
542 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
543 | spin_unlock_bh(&sta->plink_lock); | |
544 | sta_info_put(sta); | |
545 | return; | |
546 | } | |
547 | } | |
548 | ||
549 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", | |
550 | print_mac(mac, mgmt->sa), sta->plink_state, | |
551 | __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid), | |
552 | event); | |
553 | reason = 0; | |
554 | switch (sta->plink_state) { | |
555 | /* spin_unlock as soon as state is updated at each case */ | |
556 | case LISTEN: | |
557 | switch (event) { | |
558 | case CLS_ACPT: | |
559 | mesh_plink_fsm_restart(sta); | |
560 | spin_unlock_bh(&sta->plink_lock); | |
561 | break; | |
562 | case OPN_ACPT: | |
563 | sta->plink_state = OPN_RCVD; | |
564 | sta->plid = plid; | |
565 | get_random_bytes(&llid, 2); | |
566 | sta->llid = llid; | |
567 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
568 | spin_unlock_bh(&sta->plink_lock); | |
569 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
570 | 0, 0); | |
571 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, | |
572 | llid, plid, 0); | |
573 | break; | |
574 | default: | |
575 | spin_unlock_bh(&sta->plink_lock); | |
576 | break; | |
577 | } | |
578 | break; | |
579 | ||
580 | case OPN_SNT: | |
581 | switch (event) { | |
582 | case OPN_RJCT: | |
583 | case CNF_RJCT: | |
584 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
585 | case CLS_ACPT: | |
586 | if (!reason) | |
587 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
588 | sta->reason = reason; | |
589 | sta->plink_state = HOLDING; | |
590 | if (!mod_plink_timer(sta, | |
591 | dot11MeshHoldingTimeout(sdata))) | |
592 | sta->ignore_plink_timer = true; | |
593 | ||
594 | llid = sta->llid; | |
595 | spin_unlock_bh(&sta->plink_lock); | |
596 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
597 | plid, reason); | |
598 | break; | |
599 | case OPN_ACPT: | |
600 | /* retry timer is left untouched */ | |
601 | sta->plink_state = OPN_RCVD; | |
602 | sta->plid = plid; | |
603 | llid = sta->llid; | |
604 | spin_unlock_bh(&sta->plink_lock); | |
605 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
606 | plid, 0); | |
607 | break; | |
608 | case CNF_ACPT: | |
609 | sta->plink_state = CNF_RCVD; | |
610 | if (!mod_plink_timer(sta, | |
611 | dot11MeshConfirmTimeout(sdata))) | |
612 | sta->ignore_plink_timer = true; | |
613 | ||
614 | spin_unlock_bh(&sta->plink_lock); | |
615 | break; | |
616 | default: | |
617 | spin_unlock_bh(&sta->plink_lock); | |
618 | break; | |
619 | } | |
620 | break; | |
621 | ||
622 | case OPN_RCVD: | |
623 | switch (event) { | |
624 | case OPN_RJCT: | |
625 | case CNF_RJCT: | |
626 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
627 | case CLS_ACPT: | |
628 | if (!reason) | |
629 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
630 | sta->reason = reason; | |
631 | sta->plink_state = HOLDING; | |
632 | if (!mod_plink_timer(sta, | |
633 | dot11MeshHoldingTimeout(sdata))) | |
634 | sta->ignore_plink_timer = true; | |
635 | ||
636 | llid = sta->llid; | |
637 | spin_unlock_bh(&sta->plink_lock); | |
638 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
639 | plid, reason); | |
640 | break; | |
641 | case OPN_ACPT: | |
642 | llid = sta->llid; | |
643 | spin_unlock_bh(&sta->plink_lock); | |
644 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
645 | plid, 0); | |
646 | break; | |
647 | case CNF_ACPT: | |
648 | if (del_timer(&sta->plink_timer)) | |
649 | sta_info_put(sta); | |
650 | sta->plink_state = ESTAB; | |
651 | mesh_plink_inc_estab_count(sdata); | |
652 | spin_unlock_bh(&sta->plink_lock); | |
653 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
654 | print_mac(mac, sta->addr)); | |
655 | break; | |
656 | default: | |
657 | spin_unlock_bh(&sta->plink_lock); | |
658 | break; | |
659 | } | |
660 | break; | |
661 | ||
662 | case CNF_RCVD: | |
663 | switch (event) { | |
664 | case OPN_RJCT: | |
665 | case CNF_RJCT: | |
666 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
667 | case CLS_ACPT: | |
668 | if (!reason) | |
669 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
670 | sta->reason = reason; | |
671 | sta->plink_state = HOLDING; | |
672 | if (!mod_plink_timer(sta, | |
673 | dot11MeshHoldingTimeout(sdata))) | |
674 | sta->ignore_plink_timer = true; | |
675 | ||
676 | llid = sta->llid; | |
677 | spin_unlock_bh(&sta->plink_lock); | |
678 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
679 | plid, reason); | |
680 | case OPN_ACPT: | |
681 | if (del_timer(&sta->plink_timer)) | |
682 | sta_info_put(sta); | |
683 | sta->plink_state = ESTAB; | |
684 | mesh_plink_inc_estab_count(sdata); | |
685 | spin_unlock_bh(&sta->plink_lock); | |
686 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
687 | print_mac(mac, sta->addr)); | |
688 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
689 | plid, 0); | |
690 | break; | |
691 | default: | |
692 | spin_unlock_bh(&sta->plink_lock); | |
693 | break; | |
694 | } | |
695 | break; | |
696 | ||
697 | case ESTAB: | |
698 | switch (event) { | |
699 | case CLS_ACPT: | |
700 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
701 | sta->reason = reason; | |
702 | mesh_plink_deactivate(sta); | |
703 | sta->plink_state = HOLDING; | |
704 | llid = sta->llid; | |
705 | if (!mod_plink_timer(sta, | |
706 | dot11MeshHoldingTimeout(sdata))) | |
707 | __sta_info_get(sta); | |
708 | spin_unlock_bh(&sta->plink_lock); | |
709 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
710 | plid, reason); | |
711 | break; | |
712 | case OPN_ACPT: | |
713 | llid = sta->llid; | |
714 | spin_unlock_bh(&sta->plink_lock); | |
715 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
716 | plid, 0); | |
717 | break; | |
718 | default: | |
719 | spin_unlock_bh(&sta->plink_lock); | |
720 | break; | |
721 | } | |
722 | break; | |
723 | case HOLDING: | |
724 | switch (event) { | |
725 | case CLS_ACPT: | |
726 | if (del_timer(&sta->plink_timer)) { | |
727 | sta->ignore_plink_timer = 1; | |
728 | sta_info_put(sta); | |
729 | } | |
730 | mesh_plink_fsm_restart(sta); | |
731 | spin_unlock_bh(&sta->plink_lock); | |
732 | break; | |
733 | case OPN_ACPT: | |
734 | case CNF_ACPT: | |
735 | case OPN_RJCT: | |
736 | case CNF_RJCT: | |
737 | llid = sta->llid; | |
738 | reason = sta->reason; | |
739 | spin_unlock_bh(&sta->plink_lock); | |
740 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
741 | plid, reason); | |
742 | break; | |
743 | default: | |
744 | spin_unlock_bh(&sta->plink_lock); | |
745 | } | |
746 | break; | |
747 | default: | |
748 | /* should not get here, BLOCKED is dealt with at the beggining | |
749 | * of the function | |
750 | */ | |
751 | spin_unlock_bh(&sta->plink_lock); | |
752 | break; | |
753 | } | |
754 | sta_info_put(sta); | |
755 | } |