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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 | */ | |
902acc78 JB |
9 | #include <linux/kernel.h> |
10 | #include <linux/random.h> | |
c3896d2c LCC |
11 | #include "ieee80211_i.h" |
12 | #include "ieee80211_rate.h" | |
13 | #include "mesh.h" | |
c3896d2c LCC |
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); | |
d0709a65 | 68 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
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); | |
d0709a65 | 75 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
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 | { | |
b4e08ea1 | 87 | sta->plink_state = PLINK_LISTEN; |
37659ff8 LCC |
88 | sta->llid = sta->plid = sta->reason = 0; |
89 | sta->plink_retries = 0; | |
c3896d2c LCC |
90 | } |
91 | ||
93e5deb1 JB |
92 | /* |
93 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
94 | * on it in the lifecycle management section! | |
95 | */ | |
03e4497e JB |
96 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
97 | u8 *hw_addr, u64 rates) | |
c3896d2c | 98 | { |
d0709a65 | 99 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
100 | struct sta_info *sta; |
101 | ||
c3896d2c | 102 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 103 | return NULL; |
c3896d2c | 104 | |
03e4497e | 105 | sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC); |
73651ee6 JB |
106 | if (!sta) |
107 | return NULL; | |
c3896d2c | 108 | |
c3896d2c LCC |
109 | sta->flags |= WLAN_STA_AUTHORIZED; |
110 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
c3896d2c LCC |
111 | |
112 | return sta; | |
113 | } | |
114 | ||
115 | /** | |
42096b63 | 116 | * mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
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->plink_lock | |
123 | */ | |
902acc78 | 124 | static void __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 125 | { |
d0709a65 JB |
126 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
127 | ||
b4e08ea1 | 128 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c | 129 | mesh_plink_dec_estab_count(sdata); |
b4e08ea1 | 130 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
131 | mesh_path_flush_by_nexthop(sta); |
132 | } | |
133 | ||
902acc78 JB |
134 | /** |
135 | * __mesh_plink_deactivate - deactivate mesh peer link | |
136 | * | |
137 | * @sta: mesh peer link to deactivate | |
138 | * | |
139 | * All mesh paths with this peer as next hop will be flushed | |
140 | */ | |
141 | void mesh_plink_deactivate(struct sta_info *sta) | |
142 | { | |
143 | spin_lock_bh(&sta->plink_lock); | |
144 | __mesh_plink_deactivate(sta); | |
145 | spin_unlock_bh(&sta->plink_lock); | |
146 | } | |
147 | ||
c3896d2c LCC |
148 | static int mesh_plink_frame_tx(struct net_device *dev, |
149 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, | |
150 | __le16 reason) { | |
151 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
152 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); | |
153 | struct ieee80211_mgmt *mgmt; | |
154 | bool include_plid = false; | |
155 | u8 *pos; | |
156 | int ie_len; | |
157 | ||
158 | if (!skb) | |
159 | return -1; | |
160 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
161 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
162 | * common action part (1) | |
163 | */ | |
164 | mgmt = (struct ieee80211_mgmt *) | |
165 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
166 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
167 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
168 | IEEE80211_STYPE_ACTION); | |
169 | memcpy(mgmt->da, da, ETH_ALEN); | |
170 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); | |
171 | /* BSSID is left zeroed, wildcard value */ | |
172 | mgmt->u.action.category = PLINK_CATEGORY; | |
173 | mgmt->u.action.u.plink_action.action_code = action; | |
174 | ||
175 | if (action == PLINK_CLOSE) | |
176 | mgmt->u.action.u.plink_action.aux = reason; | |
177 | else { | |
178 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
179 | if (action == PLINK_CONFIRM) { | |
180 | pos = skb_put(skb, 4); | |
181 | /* two-byte status code followed by two-byte AID */ | |
182 | memset(pos, 0, 4); | |
183 | } | |
184 | mesh_mgmt_ies_add(skb, dev); | |
185 | } | |
186 | ||
187 | /* Add Peer Link Management element */ | |
188 | switch (action) { | |
189 | case PLINK_OPEN: | |
190 | ie_len = 3; | |
191 | break; | |
192 | case PLINK_CONFIRM: | |
193 | ie_len = 5; | |
194 | include_plid = true; | |
195 | break; | |
196 | case PLINK_CLOSE: | |
197 | default: | |
198 | if (!plid) | |
199 | ie_len = 5; | |
200 | else { | |
201 | ie_len = 7; | |
202 | include_plid = true; | |
203 | } | |
204 | break; | |
205 | } | |
206 | ||
207 | pos = skb_put(skb, 2 + ie_len); | |
208 | *pos++ = WLAN_EID_PEER_LINK; | |
209 | *pos++ = ie_len; | |
210 | *pos++ = action; | |
211 | memcpy(pos, &llid, 2); | |
212 | if (include_plid) { | |
213 | pos += 2; | |
214 | memcpy(pos, &plid, 2); | |
215 | } | |
216 | if (action == PLINK_CLOSE) { | |
217 | pos += 2; | |
218 | memcpy(pos, &reason, 2); | |
219 | } | |
220 | ||
221 | ieee80211_sta_tx(dev, skb, 0); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, | |
226 | bool peer_accepting_plinks) | |
227 | { | |
228 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
229 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
230 | struct sta_info *sta; | |
231 | ||
d0709a65 JB |
232 | rcu_read_lock(); |
233 | ||
c3896d2c LCC |
234 | sta = sta_info_get(local, hw_addr); |
235 | if (!sta) { | |
03e4497e | 236 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
73651ee6 JB |
237 | if (!sta) { |
238 | rcu_read_unlock(); | |
239 | return; | |
240 | } | |
241 | if (sta_info_insert(sta)) { | |
d0709a65 | 242 | rcu_read_unlock(); |
c3896d2c | 243 | return; |
d0709a65 | 244 | } |
c3896d2c LCC |
245 | } |
246 | ||
247 | sta->last_rx = jiffies; | |
248 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
b4e08ea1 | 249 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
c3896d2c LCC |
250 | sdata->u.sta.accepting_plinks && |
251 | sdata->u.sta.mshcfg.auto_open_plinks) | |
252 | mesh_plink_open(sta); | |
253 | ||
d0709a65 | 254 | rcu_read_unlock(); |
c3896d2c LCC |
255 | } |
256 | ||
257 | static void mesh_plink_timer(unsigned long data) | |
258 | { | |
259 | struct sta_info *sta; | |
260 | __le16 llid, plid, reason; | |
261 | struct net_device *dev = NULL; | |
262 | struct ieee80211_sub_if_data *sdata; | |
263 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
264 | DECLARE_MAC_BUF(mac); | |
265 | #endif | |
266 | ||
d0709a65 JB |
267 | /* |
268 | * This STA is valid because sta_info_destroy() will | |
269 | * del_timer_sync() this timer after having made sure | |
270 | * it cannot be readded (by deleting the plink.) | |
271 | */ | |
c3896d2c LCC |
272 | sta = (struct sta_info *) data; |
273 | ||
274 | spin_lock_bh(&sta->plink_lock); | |
275 | if (sta->ignore_plink_timer) { | |
276 | sta->ignore_plink_timer = false; | |
277 | spin_unlock_bh(&sta->plink_lock); | |
278 | return; | |
279 | } | |
280 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", | |
281 | print_mac(mac, sta->addr), sta->plink_state); | |
282 | reason = 0; | |
283 | llid = sta->llid; | |
284 | plid = sta->plid; | |
d0709a65 JB |
285 | sdata = sta->sdata; |
286 | dev = sdata->dev; | |
c3896d2c LCC |
287 | |
288 | switch (sta->plink_state) { | |
b4e08ea1 LCC |
289 | case PLINK_OPN_RCVD: |
290 | case PLINK_OPN_SNT: | |
c3896d2c LCC |
291 | /* retry timer */ |
292 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
293 | u32 rand; | |
294 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", | |
295 | print_mac(mac, sta->addr), | |
296 | sta->plink_retries, sta->plink_timeout); | |
297 | get_random_bytes(&rand, sizeof(u32)); | |
298 | sta->plink_timeout = sta->plink_timeout + | |
299 | rand % sta->plink_timeout; | |
300 | ++sta->plink_retries; | |
d0709a65 | 301 | mod_plink_timer(sta, sta->plink_timeout); |
c3896d2c LCC |
302 | spin_unlock_bh(&sta->plink_lock); |
303 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
304 | 0, 0); | |
305 | break; | |
306 | } | |
307 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
308 | /* fall through on else */ | |
b4e08ea1 | 309 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
310 | /* confirm timer */ |
311 | if (!reason) | |
312 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
b4e08ea1 | 313 | sta->plink_state = PLINK_HOLDING; |
d0709a65 | 314 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
315 | spin_unlock_bh(&sta->plink_lock); |
316 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, | |
317 | reason); | |
318 | break; | |
b4e08ea1 | 319 | case PLINK_HOLDING: |
c3896d2c | 320 | /* holding timer */ |
d0709a65 | 321 | del_timer(&sta->plink_timer); |
c3896d2c LCC |
322 | mesh_plink_fsm_restart(sta); |
323 | spin_unlock_bh(&sta->plink_lock); | |
324 | break; | |
325 | default: | |
326 | spin_unlock_bh(&sta->plink_lock); | |
327 | break; | |
328 | } | |
c3896d2c LCC |
329 | } |
330 | ||
331 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) | |
332 | { | |
333 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
334 | sta->plink_timer.data = (unsigned long) sta; | |
335 | sta->plink_timer.function = mesh_plink_timer; | |
336 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
337 | add_timer(&sta->plink_timer); |
338 | } | |
339 | ||
340 | int mesh_plink_open(struct sta_info *sta) | |
341 | { | |
342 | __le16 llid; | |
d0709a65 | 343 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c LCC |
344 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
345 | DECLARE_MAC_BUF(mac); | |
346 | #endif | |
347 | ||
348 | spin_lock_bh(&sta->plink_lock); | |
349 | get_random_bytes(&llid, 2); | |
350 | sta->llid = llid; | |
b4e08ea1 | 351 | if (sta->plink_state != PLINK_LISTEN) { |
c3896d2c | 352 | spin_unlock_bh(&sta->plink_lock); |
c3896d2c LCC |
353 | return -EBUSY; |
354 | } | |
b4e08ea1 | 355 | sta->plink_state = PLINK_OPN_SNT; |
c3896d2c LCC |
356 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
357 | spin_unlock_bh(&sta->plink_lock); | |
358 | mpl_dbg("Mesh plink: starting establishment with %s\n", | |
359 | print_mac(mac, sta->addr)); | |
360 | ||
d0709a65 JB |
361 | return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN, |
362 | sta->addr, llid, 0, 0); | |
c3896d2c LCC |
363 | } |
364 | ||
365 | void mesh_plink_block(struct sta_info *sta) | |
366 | { | |
367 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
368 | DECLARE_MAC_BUF(mac); | |
369 | #endif | |
370 | ||
371 | spin_lock_bh(&sta->plink_lock); | |
902acc78 | 372 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 373 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
374 | spin_unlock_bh(&sta->plink_lock); |
375 | } | |
376 | ||
377 | int mesh_plink_close(struct sta_info *sta) | |
378 | { | |
d0709a65 | 379 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
37659ff8 | 380 | __le16 llid, plid, reason; |
c3896d2c LCC |
381 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
382 | DECLARE_MAC_BUF(mac); | |
383 | #endif | |
384 | ||
385 | mpl_dbg("Mesh plink: closing link with %s\n", | |
386 | print_mac(mac, sta->addr)); | |
387 | spin_lock_bh(&sta->plink_lock); | |
388 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); | |
389 | reason = sta->reason; | |
390 | ||
b4e08ea1 LCC |
391 | if (sta->plink_state == PLINK_LISTEN || |
392 | sta->plink_state == PLINK_BLOCKED) { | |
c3896d2c LCC |
393 | mesh_plink_fsm_restart(sta); |
394 | spin_unlock_bh(&sta->plink_lock); | |
c3896d2c | 395 | return 0; |
b4e08ea1 | 396 | } else if (sta->plink_state == PLINK_ESTAB) { |
902acc78 | 397 | __mesh_plink_deactivate(sta); |
c3896d2c | 398 | /* The timer should not be running */ |
d0709a65 | 399 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
400 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
401 | sta->ignore_plink_timer = true; | |
402 | ||
b4e08ea1 | 403 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
404 | llid = sta->llid; |
405 | plid = sta->plid; | |
406 | spin_unlock_bh(&sta->plink_lock); | |
d0709a65 JB |
407 | mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid, |
408 | plid, reason); | |
c3896d2c LCC |
409 | return 0; |
410 | } | |
411 | ||
412 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, | |
413 | size_t len, struct ieee80211_rx_status *rx_status) | |
414 | { | |
d0709a65 JB |
415 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
416 | struct ieee80211_local *local = sdata->local; | |
c3896d2c LCC |
417 | struct ieee802_11_elems elems; |
418 | struct sta_info *sta; | |
419 | enum plink_event event; | |
420 | enum plink_frame_type ftype; | |
421 | size_t baselen; | |
422 | u8 ie_len; | |
423 | u8 *baseaddr; | |
424 | __le16 plid, llid, reason; | |
425 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
426 | DECLARE_MAC_BUF(mac); | |
427 | #endif | |
c3896d2c LCC |
428 | |
429 | if (is_multicast_ether_addr(mgmt->da)) { | |
430 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
431 | return; | |
432 | } | |
433 | ||
434 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
435 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
436 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
437 | baseaddr += 4; | |
438 | baselen -= 4; | |
439 | } | |
440 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
441 | if (!elems.peer_link) { | |
442 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
443 | return; | |
444 | } | |
445 | ||
446 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); | |
447 | ie_len = elems.peer_link_len; | |
448 | if ((ftype == PLINK_OPEN && ie_len != 3) || | |
449 | (ftype == PLINK_CONFIRM && ie_len != 5) || | |
450 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { | |
451 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); | |
452 | return; | |
453 | } | |
454 | ||
455 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
456 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
457 | return; | |
458 | } | |
459 | /* Note the lines below are correct, the llid in the frame is the plid | |
460 | * from the point of view of this host. | |
461 | */ | |
462 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
463 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) | |
464 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); | |
465 | ||
d0709a65 JB |
466 | rcu_read_lock(); |
467 | ||
c3896d2c LCC |
468 | sta = sta_info_get(local, mgmt->sa); |
469 | if (!sta && ftype != PLINK_OPEN) { | |
470 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
d0709a65 | 471 | rcu_read_unlock(); |
c3896d2c LCC |
472 | return; |
473 | } | |
474 | ||
b4e08ea1 | 475 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
d0709a65 | 476 | rcu_read_unlock(); |
c3896d2c LCC |
477 | return; |
478 | } | |
479 | ||
480 | /* Now we will figure out the appropriate event... */ | |
481 | event = PLINK_UNDEFINED; | |
482 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { | |
483 | switch (ftype) { | |
484 | case PLINK_OPEN: | |
485 | event = OPN_RJCT; | |
486 | break; | |
487 | case PLINK_CONFIRM: | |
488 | event = CNF_RJCT; | |
489 | break; | |
490 | case PLINK_CLOSE: | |
491 | /* avoid warning */ | |
492 | break; | |
493 | } | |
494 | spin_lock_bh(&sta->plink_lock); | |
495 | } else if (!sta) { | |
496 | /* ftype == PLINK_OPEN */ | |
497 | u64 rates; | |
498 | if (!mesh_plink_free_count(sdata)) { | |
499 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
d0709a65 | 500 | rcu_read_unlock(); |
c3896d2c LCC |
501 | return; |
502 | } | |
503 | ||
504 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
03e4497e | 505 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
73651ee6 | 506 | if (!sta) { |
c3896d2c | 507 | mpl_dbg("Mesh plink error: plink table full\n"); |
d0709a65 | 508 | rcu_read_unlock(); |
c3896d2c LCC |
509 | return; |
510 | } | |
73651ee6 | 511 | if (sta_info_insert(sta)) { |
73651ee6 JB |
512 | rcu_read_unlock(); |
513 | return; | |
514 | } | |
c3896d2c LCC |
515 | event = OPN_ACPT; |
516 | spin_lock_bh(&sta->plink_lock); | |
517 | } else { | |
518 | spin_lock_bh(&sta->plink_lock); | |
519 | switch (ftype) { | |
520 | case PLINK_OPEN: | |
521 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 522 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
523 | event = OPN_IGNR; |
524 | else | |
525 | event = OPN_ACPT; | |
526 | break; | |
527 | case PLINK_CONFIRM: | |
528 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 529 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
530 | event = CNF_IGNR; |
531 | else | |
532 | event = CNF_ACPT; | |
533 | break; | |
534 | case PLINK_CLOSE: | |
b4e08ea1 | 535 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c LCC |
536 | /* Do not check for llid or plid. This does not |
537 | * follow the standard but since multiple plinks | |
538 | * per sta are not supported, it is necessary in | |
539 | * order to avoid a livelock when MP A sees an | |
540 | * establish peer link to MP B but MP B does not | |
541 | * see it. This can be caused by a timeout in | |
542 | * B's peer link establishment or B beign | |
543 | * restarted. | |
544 | */ | |
545 | event = CLS_ACPT; | |
546 | else if (sta->plid != plid) | |
547 | event = CLS_IGNR; | |
548 | else if (ie_len == 7 && sta->llid != llid) | |
549 | event = CLS_IGNR; | |
550 | else | |
551 | event = CLS_ACPT; | |
552 | break; | |
553 | default: | |
554 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
555 | spin_unlock_bh(&sta->plink_lock); | |
d0709a65 | 556 | rcu_read_unlock(); |
c3896d2c LCC |
557 | return; |
558 | } | |
559 | } | |
560 | ||
561 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", | |
562 | print_mac(mac, mgmt->sa), sta->plink_state, | |
aa2b5928 | 563 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
c3896d2c LCC |
564 | event); |
565 | reason = 0; | |
566 | switch (sta->plink_state) { | |
567 | /* spin_unlock as soon as state is updated at each case */ | |
b4e08ea1 | 568 | case PLINK_LISTEN: |
c3896d2c LCC |
569 | switch (event) { |
570 | case CLS_ACPT: | |
571 | mesh_plink_fsm_restart(sta); | |
572 | spin_unlock_bh(&sta->plink_lock); | |
573 | break; | |
574 | case OPN_ACPT: | |
b4e08ea1 | 575 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
576 | sta->plid = plid; |
577 | get_random_bytes(&llid, 2); | |
578 | sta->llid = llid; | |
579 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
580 | spin_unlock_bh(&sta->plink_lock); | |
581 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
582 | 0, 0); | |
583 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, | |
584 | llid, plid, 0); | |
585 | break; | |
586 | default: | |
587 | spin_unlock_bh(&sta->plink_lock); | |
588 | break; | |
589 | } | |
590 | break; | |
591 | ||
b4e08ea1 | 592 | case PLINK_OPN_SNT: |
c3896d2c LCC |
593 | switch (event) { |
594 | case OPN_RJCT: | |
595 | case CNF_RJCT: | |
596 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
597 | case CLS_ACPT: | |
598 | if (!reason) | |
599 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
600 | sta->reason = reason; | |
b4e08ea1 | 601 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
602 | if (!mod_plink_timer(sta, |
603 | dot11MeshHoldingTimeout(sdata))) | |
604 | sta->ignore_plink_timer = true; | |
605 | ||
606 | llid = sta->llid; | |
607 | spin_unlock_bh(&sta->plink_lock); | |
608 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
609 | plid, reason); | |
610 | break; | |
611 | case OPN_ACPT: | |
612 | /* retry timer is left untouched */ | |
b4e08ea1 | 613 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
614 | sta->plid = plid; |
615 | llid = sta->llid; | |
616 | spin_unlock_bh(&sta->plink_lock); | |
617 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
618 | plid, 0); | |
619 | break; | |
620 | case CNF_ACPT: | |
b4e08ea1 | 621 | sta->plink_state = PLINK_CNF_RCVD; |
c3896d2c LCC |
622 | if (!mod_plink_timer(sta, |
623 | dot11MeshConfirmTimeout(sdata))) | |
624 | sta->ignore_plink_timer = true; | |
625 | ||
626 | spin_unlock_bh(&sta->plink_lock); | |
627 | break; | |
628 | default: | |
629 | spin_unlock_bh(&sta->plink_lock); | |
630 | break; | |
631 | } | |
632 | break; | |
633 | ||
b4e08ea1 | 634 | case PLINK_OPN_RCVD: |
c3896d2c LCC |
635 | switch (event) { |
636 | case OPN_RJCT: | |
637 | case CNF_RJCT: | |
638 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
639 | case CLS_ACPT: | |
640 | if (!reason) | |
641 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
642 | sta->reason = reason; | |
b4e08ea1 | 643 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
644 | if (!mod_plink_timer(sta, |
645 | dot11MeshHoldingTimeout(sdata))) | |
646 | sta->ignore_plink_timer = true; | |
647 | ||
648 | llid = sta->llid; | |
649 | spin_unlock_bh(&sta->plink_lock); | |
650 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
651 | plid, reason); | |
652 | break; | |
653 | case OPN_ACPT: | |
654 | llid = sta->llid; | |
655 | spin_unlock_bh(&sta->plink_lock); | |
656 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
657 | plid, 0); | |
658 | break; | |
659 | case CNF_ACPT: | |
d0709a65 | 660 | del_timer(&sta->plink_timer); |
b4e08ea1 | 661 | sta->plink_state = PLINK_ESTAB; |
c3896d2c LCC |
662 | mesh_plink_inc_estab_count(sdata); |
663 | spin_unlock_bh(&sta->plink_lock); | |
664 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
665 | print_mac(mac, sta->addr)); | |
666 | break; | |
667 | default: | |
668 | spin_unlock_bh(&sta->plink_lock); | |
669 | break; | |
670 | } | |
671 | break; | |
672 | ||
b4e08ea1 | 673 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
674 | switch (event) { |
675 | case OPN_RJCT: | |
676 | case CNF_RJCT: | |
677 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
678 | case CLS_ACPT: | |
679 | if (!reason) | |
680 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
681 | sta->reason = reason; | |
b4e08ea1 | 682 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
683 | if (!mod_plink_timer(sta, |
684 | dot11MeshHoldingTimeout(sdata))) | |
685 | sta->ignore_plink_timer = true; | |
686 | ||
687 | llid = sta->llid; | |
688 | spin_unlock_bh(&sta->plink_lock); | |
689 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
690 | plid, reason); | |
ff59dc76 | 691 | break; |
c3896d2c | 692 | case OPN_ACPT: |
d0709a65 | 693 | del_timer(&sta->plink_timer); |
b4e08ea1 | 694 | sta->plink_state = PLINK_ESTAB; |
c3896d2c LCC |
695 | mesh_plink_inc_estab_count(sdata); |
696 | spin_unlock_bh(&sta->plink_lock); | |
697 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
698 | print_mac(mac, sta->addr)); | |
699 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
700 | plid, 0); | |
701 | break; | |
702 | default: | |
703 | spin_unlock_bh(&sta->plink_lock); | |
704 | break; | |
705 | } | |
706 | break; | |
707 | ||
b4e08ea1 | 708 | case PLINK_ESTAB: |
c3896d2c LCC |
709 | switch (event) { |
710 | case CLS_ACPT: | |
711 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
712 | sta->reason = reason; | |
902acc78 | 713 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 714 | sta->plink_state = PLINK_HOLDING; |
c3896d2c | 715 | llid = sta->llid; |
d0709a65 | 716 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
717 | spin_unlock_bh(&sta->plink_lock); |
718 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
719 | plid, reason); | |
720 | break; | |
721 | case OPN_ACPT: | |
722 | llid = sta->llid; | |
723 | spin_unlock_bh(&sta->plink_lock); | |
724 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
725 | plid, 0); | |
726 | break; | |
727 | default: | |
728 | spin_unlock_bh(&sta->plink_lock); | |
729 | break; | |
730 | } | |
731 | break; | |
b4e08ea1 | 732 | case PLINK_HOLDING: |
c3896d2c LCC |
733 | switch (event) { |
734 | case CLS_ACPT: | |
d0709a65 | 735 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 736 | sta->ignore_plink_timer = 1; |
c3896d2c LCC |
737 | mesh_plink_fsm_restart(sta); |
738 | spin_unlock_bh(&sta->plink_lock); | |
739 | break; | |
740 | case OPN_ACPT: | |
741 | case CNF_ACPT: | |
742 | case OPN_RJCT: | |
743 | case CNF_RJCT: | |
744 | llid = sta->llid; | |
745 | reason = sta->reason; | |
746 | spin_unlock_bh(&sta->plink_lock); | |
747 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
748 | plid, reason); | |
749 | break; | |
750 | default: | |
751 | spin_unlock_bh(&sta->plink_lock); | |
752 | } | |
753 | break; | |
754 | default: | |
b4e08ea1 LCC |
755 | /* should not get here, PLINK_BLOCKED is dealt with at the |
756 | * beggining of the function | |
c3896d2c LCC |
757 | */ |
758 | spin_unlock_bh(&sta->plink_lock); | |
759 | break; | |
760 | } | |
d0709a65 JB |
761 | |
762 | rcu_read_unlock(); | |
c3896d2c | 763 | } |