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Commit | Line | Data |
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c3896d2c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
c3896d2c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
5a0e3ad6 | 9 | #include <linux/gfp.h> |
902acc78 JB |
10 | #include <linux/kernel.h> |
11 | #include <linux/random.h> | |
c3896d2c | 12 | #include "ieee80211_i.h" |
2c8dccc7 | 13 | #include "rate.h" |
c3896d2c | 14 | #include "mesh.h" |
c3896d2c LCC |
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 | ||
8db09850 TP |
22 | #define PLINK_GET_LLID(p) (p + 2) |
23 | #define PLINK_GET_PLID(p) (p + 4) | |
c3896d2c LCC |
24 | |
25 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
26 | jiffies + HZ * t / 1000)) | |
27 | ||
472dbc45 JB |
28 | #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) |
29 | #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) | |
30 | #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) | |
31 | #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) | |
32 | #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) | |
c3896d2c | 33 | |
3d4f9699 AN |
34 | /* We only need a valid sta if user configured a minimum rssi_threshold. */ |
35 | #define rssi_threshold_check(sta, sdata) \ | |
55335137 | 36 | (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\ |
3d4f9699 AN |
37 | (sta && (s8) -ewma_read(&sta->avg_signal) > \ |
38 | sdata->u.mesh.mshcfg.rssi_threshold)) | |
55335137 | 39 | |
c3896d2c LCC |
40 | enum plink_event { |
41 | PLINK_UNDEFINED, | |
42 | OPN_ACPT, | |
43 | OPN_RJCT, | |
44 | OPN_IGNR, | |
45 | CNF_ACPT, | |
46 | CNF_RJCT, | |
47 | CNF_IGNR, | |
48 | CLS_ACPT, | |
49 | CLS_IGNR | |
50 | }; | |
51 | ||
ba4a14e1 TP |
52 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
53 | enum ieee80211_self_protected_actioncode action, | |
54 | u8 *da, __le16 llid, __le16 plid, __le16 reason); | |
55 | ||
c3896d2c LCC |
56 | static inline |
57 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
58 | { | |
472dbc45 | 59 | atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 60 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
61 | } |
62 | ||
63 | static inline | |
64 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
65 | { | |
472dbc45 | 66 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 67 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
68 | } |
69 | ||
70 | /** | |
71 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
72 | * | |
23c7a29c | 73 | * @sta: mesh peer link to restart |
c3896d2c | 74 | * |
07346f81 | 75 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
76 | */ |
77 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
78 | { | |
57cf8043 | 79 | sta->plink_state = NL80211_PLINK_LISTEN; |
37659ff8 LCC |
80 | sta->llid = sta->plid = sta->reason = 0; |
81 | sta->plink_retries = 0; | |
c3896d2c LCC |
82 | } |
83 | ||
93e5deb1 | 84 | /* |
54ab1ffb | 85 | * Allocate mesh sta entry and insert into station table |
93e5deb1 | 86 | */ |
03e4497e | 87 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
54ab1ffb | 88 | u8 *hw_addr) |
c3896d2c | 89 | { |
c3896d2c LCC |
90 | struct sta_info *sta; |
91 | ||
54ab1ffb | 92 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 93 | return NULL; |
c3896d2c | 94 | |
34e89507 | 95 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
73651ee6 JB |
96 | if (!sta) |
97 | return NULL; | |
c3896d2c | 98 | |
83d5cc01 JB |
99 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
100 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
101 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
d9a7ddb0 | 102 | |
c2c98fde | 103 | set_sta_flag(sta, WLAN_STA_WME); |
d9a7ddb0 | 104 | |
54ab1ffb TP |
105 | if (sta_info_insert(sta)) |
106 | return NULL; | |
c3896d2c LCC |
107 | |
108 | return sta; | |
109 | } | |
110 | ||
111 | /** | |
c9370197 | 112 | * __mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
113 | * |
114 | * @sta: mesh peer link to deactivate | |
115 | * | |
116 | * All mesh paths with this peer as next hop will be flushed | |
117 | * | |
07346f81 | 118 | * Locking: the caller must hold sta->lock |
c3896d2c | 119 | */ |
c9370197 | 120 | static bool __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 121 | { |
d0709a65 | 122 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c9370197 | 123 | bool deactivated = false; |
d0709a65 | 124 | |
57cf8043 | 125 | if (sta->plink_state == NL80211_PLINK_ESTAB) { |
c3896d2c | 126 | mesh_plink_dec_estab_count(sdata); |
c9370197 JL |
127 | deactivated = true; |
128 | } | |
57cf8043 | 129 | sta->plink_state = NL80211_PLINK_BLOCKED; |
c3896d2c | 130 | mesh_path_flush_by_nexthop(sta); |
c9370197 JL |
131 | |
132 | return deactivated; | |
c3896d2c LCC |
133 | } |
134 | ||
902acc78 | 135 | /** |
c9370197 | 136 | * mesh_plink_deactivate - deactivate mesh peer link |
902acc78 JB |
137 | * |
138 | * @sta: mesh peer link to deactivate | |
139 | * | |
140 | * All mesh paths with this peer as next hop will be flushed | |
141 | */ | |
142 | void mesh_plink_deactivate(struct sta_info *sta) | |
143 | { | |
c9370197 JL |
144 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
145 | bool deactivated; | |
146 | ||
07346f81 | 147 | spin_lock_bh(&sta->lock); |
c9370197 | 148 | deactivated = __mesh_plink_deactivate(sta); |
ba4a14e1 TP |
149 | sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); |
150 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, | |
151 | sta->sta.addr, sta->llid, sta->plid, | |
152 | sta->reason); | |
07346f81 | 153 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
154 | |
155 | if (deactivated) | |
156 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
902acc78 JB |
157 | } |
158 | ||
f698d856 | 159 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
54ef656b TP |
160 | enum ieee80211_self_protected_actioncode action, |
161 | u8 *da, __le16 llid, __le16 plid, __le16 reason) { | |
f698d856 | 162 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 163 | struct sk_buff *skb; |
c3896d2c LCC |
164 | struct ieee80211_mgmt *mgmt; |
165 | bool include_plid = false; | |
8db09850 | 166 | u16 peering_proto = 0; |
3b69a9c5 TP |
167 | u8 *pos, ie_len = 4; |
168 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
169 | sizeof(mgmt->u.action.u.self_prot); | |
170 | ||
65e8b0cc | 171 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
172 | hdr_len + |
173 | 2 + /* capability info */ | |
174 | 2 + /* AID */ | |
175 | 2 + 8 + /* supported rates */ | |
176 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
177 | 2 + sdata->u.mesh.mesh_id_len + | |
178 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 179 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 180 | 2 + sizeof(struct ieee80211_ht_operation) + |
3b69a9c5 TP |
181 | 2 + 8 + /* peering IE */ |
182 | sdata->u.mesh.ie_len); | |
c3896d2c LCC |
183 | if (!skb) |
184 | return -1; | |
65e8b0cc | 185 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
186 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
187 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
188 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
189 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 190 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 191 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 192 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
193 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
194 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 195 | |
8db09850 TP |
196 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
197 | /* capability info */ | |
198 | pos = skb_put(skb, 2); | |
199 | memset(pos, 0, 2); | |
54ef656b | 200 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
201 | /* AID */ |
202 | pos = skb_put(skb, 2); | |
77fa76bb | 203 | memcpy(pos + 2, &plid, 2); |
c3896d2c | 204 | } |
657c3e0c AN |
205 | if (ieee80211_add_srates_ie(&sdata->vif, skb, true) || |
206 | ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) || | |
082ebb0c TP |
207 | mesh_add_rsn_ie(skb, sdata) || |
208 | mesh_add_meshid_ie(skb, sdata) || | |
209 | mesh_add_meshconf_ie(skb, sdata)) | |
210 | return -1; | |
8db09850 TP |
211 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
212 | if (mesh_add_meshid_ie(skb, sdata)) | |
213 | return -1; | |
c3896d2c LCC |
214 | } |
215 | ||
8db09850 | 216 | /* Add Mesh Peering Management element */ |
c3896d2c | 217 | switch (action) { |
54ef656b | 218 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 219 | break; |
54ef656b | 220 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 221 | ie_len += 2; |
c3896d2c LCC |
222 | include_plid = true; |
223 | break; | |
54ef656b | 224 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
225 | if (plid) { |
226 | ie_len += 2; | |
c3896d2c LCC |
227 | include_plid = true; |
228 | } | |
8db09850 | 229 | ie_len += 2; /* reason code */ |
c3896d2c | 230 | break; |
8db09850 TP |
231 | default: |
232 | return -EINVAL; | |
c3896d2c LCC |
233 | } |
234 | ||
8db09850 TP |
235 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
236 | return -ENOMEM; | |
237 | ||
c3896d2c | 238 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 239 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 240 | *pos++ = ie_len; |
8db09850 TP |
241 | memcpy(pos, &peering_proto, 2); |
242 | pos += 2; | |
c3896d2c | 243 | memcpy(pos, &llid, 2); |
8db09850 | 244 | pos += 2; |
c3896d2c | 245 | if (include_plid) { |
c3896d2c | 246 | memcpy(pos, &plid, 2); |
8db09850 | 247 | pos += 2; |
c3896d2c | 248 | } |
54ef656b | 249 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
c3896d2c | 250 | memcpy(pos, &reason, 2); |
8db09850 | 251 | pos += 2; |
c3896d2c | 252 | } |
176f3608 TP |
253 | |
254 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
255 | if (mesh_add_ht_cap_ie(skb, sdata) || | |
074d46d1 | 256 | mesh_add_ht_oper_ie(skb, sdata)) |
176f3608 TP |
257 | return -1; |
258 | } | |
259 | ||
8db09850 TP |
260 | if (mesh_add_vendor_ies(skb, sdata)) |
261 | return -1; | |
c3896d2c | 262 | |
62ae67be | 263 | ieee80211_tx_skb(sdata, skb); |
c3896d2c LCC |
264 | return 0; |
265 | } | |
266 | ||
54ab1ffb TP |
267 | /* mesh_peer_init - initialize new mesh peer and return resulting sta_info |
268 | * | |
269 | * @sdata: local meshif | |
270 | * @addr: peer's address | |
54ab1ffb TP |
271 | * @elems: IEs from beacon or mesh peering frame |
272 | * | |
273 | * call under RCU | |
274 | */ | |
275 | static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata, | |
f743ff49 | 276 | u8 *addr, |
54ab1ffb | 277 | struct ieee802_11_elems *elems) |
c3896d2c | 278 | { |
f698d856 | 279 | struct ieee80211_local *local = sdata->local; |
f743ff49 | 280 | enum ieee80211_band band = local->oper_channel->band; |
54ab1ffb | 281 | struct ieee80211_supported_band *sband; |
f743ff49 | 282 | u32 rates, basic_rates = 0; |
c3896d2c LCC |
283 | struct sta_info *sta; |
284 | ||
f743ff49 TP |
285 | sband = local->hw.wiphy->bands[band]; |
286 | rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates); | |
d0709a65 | 287 | |
54ab1ffb | 288 | sta = sta_info_get(sdata, addr); |
c3896d2c | 289 | if (!sta) { |
54ab1ffb | 290 | sta = mesh_plink_alloc(sdata, addr); |
34e89507 | 291 | if (!sta) |
54ab1ffb | 292 | return NULL; |
c3896d2c LCC |
293 | } |
294 | ||
54ab1ffb | 295 | spin_lock_bh(&sta->lock); |
c3896d2c | 296 | sta->last_rx = jiffies; |
f743ff49 | 297 | sta->sta.supp_rates[band] = rates; |
54ab1ffb TP |
298 | if (elems->ht_cap_elem) |
299 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
300 | elems->ht_cap_elem, | |
301 | &sta->sta.ht_cap); | |
302 | else | |
303 | memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap)); | |
304 | ||
305 | rate_control_rate_init(sta); | |
306 | spin_unlock_bh(&sta->lock); | |
307 | ||
308 | return sta; | |
309 | } | |
310 | ||
f743ff49 TP |
311 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
312 | u8 *hw_addr, | |
54ab1ffb TP |
313 | struct ieee802_11_elems *elems) |
314 | { | |
315 | struct sta_info *sta; | |
316 | ||
317 | /* Userspace handles peer allocation when security is enabled */ | |
318 | if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { | |
319 | cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr, | |
320 | elems->ie_start, | |
321 | elems->total_len, | |
322 | GFP_KERNEL); | |
323 | return; | |
324 | } | |
325 | ||
326 | rcu_read_lock(); | |
f743ff49 | 327 | sta = mesh_peer_init(sdata, hw_addr, elems); |
54ab1ffb TP |
328 | if (!sta) |
329 | goto out; | |
330 | ||
1570ca59 | 331 | if (mesh_peer_accepts_plinks(elems) && |
54ab1ffb TP |
332 | sta->plink_state == NL80211_PLINK_LISTEN && |
333 | sdata->u.mesh.accepting_plinks && | |
334 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
335 | rssi_threshold_check(sta, sdata)) | |
c3896d2c LCC |
336 | mesh_plink_open(sta); |
337 | ||
54ab1ffb | 338 | out: |
d0709a65 | 339 | rcu_read_unlock(); |
c3896d2c LCC |
340 | } |
341 | ||
342 | static void mesh_plink_timer(unsigned long data) | |
343 | { | |
344 | struct sta_info *sta; | |
345 | __le16 llid, plid, reason; | |
c3896d2c | 346 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 347 | |
d0709a65 JB |
348 | /* |
349 | * This STA is valid because sta_info_destroy() will | |
350 | * del_timer_sync() this timer after having made sure | |
351 | * it cannot be readded (by deleting the plink.) | |
352 | */ | |
c3896d2c LCC |
353 | sta = (struct sta_info *) data; |
354 | ||
5bb644a0 JB |
355 | if (sta->sdata->local->quiescing) { |
356 | sta->plink_timer_was_running = true; | |
357 | return; | |
358 | } | |
359 | ||
07346f81 | 360 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
361 | if (sta->ignore_plink_timer) { |
362 | sta->ignore_plink_timer = false; | |
07346f81 | 363 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
364 | return; |
365 | } | |
0c68ae26 JB |
366 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
367 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
368 | reason = 0; |
369 | llid = sta->llid; | |
370 | plid = sta->plid; | |
d0709a65 | 371 | sdata = sta->sdata; |
c3896d2c LCC |
372 | |
373 | switch (sta->plink_state) { | |
57cf8043 JC |
374 | case NL80211_PLINK_OPN_RCVD: |
375 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c LCC |
376 | /* retry timer */ |
377 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
378 | u32 rand; | |
0c68ae26 JB |
379 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
380 | sta->sta.addr, sta->plink_retries, | |
381 | sta->plink_timeout); | |
c3896d2c LCC |
382 | get_random_bytes(&rand, sizeof(u32)); |
383 | sta->plink_timeout = sta->plink_timeout + | |
384 | rand % sta->plink_timeout; | |
385 | ++sta->plink_retries; | |
d0709a65 | 386 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 387 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
388 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
389 | sta->sta.addr, llid, 0, 0); | |
c3896d2c LCC |
390 | break; |
391 | } | |
54ef656b | 392 | reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); |
c3896d2c | 393 | /* fall through on else */ |
57cf8043 | 394 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
395 | /* confirm timer */ |
396 | if (!reason) | |
54ef656b | 397 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); |
57cf8043 | 398 | sta->plink_state = NL80211_PLINK_HOLDING; |
d0709a65 | 399 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 400 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
401 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
402 | sta->sta.addr, llid, plid, reason); | |
c3896d2c | 403 | break; |
57cf8043 | 404 | case NL80211_PLINK_HOLDING: |
c3896d2c | 405 | /* holding timer */ |
d0709a65 | 406 | del_timer(&sta->plink_timer); |
c3896d2c | 407 | mesh_plink_fsm_restart(sta); |
07346f81 | 408 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
409 | break; |
410 | default: | |
07346f81 | 411 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
412 | break; |
413 | } | |
c3896d2c LCC |
414 | } |
415 | ||
5bb644a0 JB |
416 | #ifdef CONFIG_PM |
417 | void mesh_plink_quiesce(struct sta_info *sta) | |
418 | { | |
419 | if (del_timer_sync(&sta->plink_timer)) | |
420 | sta->plink_timer_was_running = true; | |
421 | } | |
422 | ||
423 | void mesh_plink_restart(struct sta_info *sta) | |
424 | { | |
425 | if (sta->plink_timer_was_running) { | |
426 | add_timer(&sta->plink_timer); | |
427 | sta->plink_timer_was_running = false; | |
428 | } | |
429 | } | |
430 | #endif | |
431 | ||
c3896d2c LCC |
432 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
433 | { | |
434 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
435 | sta->plink_timer.data = (unsigned long) sta; | |
436 | sta->plink_timer.function = mesh_plink_timer; | |
437 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
438 | add_timer(&sta->plink_timer); |
439 | } | |
440 | ||
441 | int mesh_plink_open(struct sta_info *sta) | |
442 | { | |
443 | __le16 llid; | |
d0709a65 | 444 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 445 | |
c2c98fde | 446 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
53e80511 JC |
447 | return -EPERM; |
448 | ||
07346f81 | 449 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
450 | get_random_bytes(&llid, 2); |
451 | sta->llid = llid; | |
57cf8043 | 452 | if (sta->plink_state != NL80211_PLINK_LISTEN) { |
07346f81 | 453 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
454 | return -EBUSY; |
455 | } | |
57cf8043 | 456 | sta->plink_state = NL80211_PLINK_OPN_SNT; |
c3896d2c | 457 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 458 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
459 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
460 | sta->sta.addr); | |
c3896d2c | 461 | |
54ef656b | 462 | return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
17741cdc | 463 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
464 | } |
465 | ||
466 | void mesh_plink_block(struct sta_info *sta) | |
467 | { | |
c9370197 JL |
468 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
469 | bool deactivated; | |
470 | ||
07346f81 | 471 | spin_lock_bh(&sta->lock); |
c9370197 | 472 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 473 | sta->plink_state = NL80211_PLINK_BLOCKED; |
07346f81 | 474 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
475 | |
476 | if (deactivated) | |
477 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
c3896d2c LCC |
478 | } |
479 | ||
c3896d2c | 480 | |
f698d856 | 481 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
482 | size_t len, struct ieee80211_rx_status *rx_status) |
483 | { | |
c3896d2c LCC |
484 | struct ieee802_11_elems elems; |
485 | struct sta_info *sta; | |
486 | enum plink_event event; | |
54ef656b | 487 | enum ieee80211_self_protected_actioncode ftype; |
c3896d2c | 488 | size_t baselen; |
d12c7452 | 489 | bool deactivated, matches_local = true; |
c3896d2c LCC |
490 | u8 ie_len; |
491 | u8 *baseaddr; | |
492 | __le16 plid, llid, reason; | |
1460dd15 RP |
493 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
494 | static const char *mplstates[] = { | |
57cf8043 JC |
495 | [NL80211_PLINK_LISTEN] = "LISTEN", |
496 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
497 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
498 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
499 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
500 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
501 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
1460dd15 RP |
502 | }; |
503 | #endif | |
c3896d2c | 504 | |
9c80d3dc JB |
505 | /* need action_code, aux */ |
506 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
507 | return; | |
508 | ||
c3896d2c LCC |
509 | if (is_multicast_ether_addr(mgmt->da)) { |
510 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
511 | return; | |
512 | } | |
513 | ||
8db09850 TP |
514 | baseaddr = mgmt->u.action.u.self_prot.variable; |
515 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
516 | if (mgmt->u.action.u.self_prot.action_code == | |
54ef656b | 517 | WLAN_SP_MESH_PEERING_CONFIRM) { |
c3896d2c | 518 | baseaddr += 4; |
70bdb6b2 | 519 | baselen += 4; |
c3896d2c LCC |
520 | } |
521 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
8db09850 | 522 | if (!elems.peering) { |
c3896d2c LCC |
523 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
524 | return; | |
525 | } | |
b130e5ce JC |
526 | if (elems.rsn_len && |
527 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { | |
5cff5e01 JC |
528 | mpl_dbg("Mesh plink: can't establish link with secure peer\n"); |
529 | return; | |
530 | } | |
c3896d2c | 531 | |
8db09850 TP |
532 | ftype = mgmt->u.action.u.self_prot.action_code; |
533 | ie_len = elems.peering_len; | |
534 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || | |
535 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
536 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
537 | && ie_len != 8)) { | |
0938393f RP |
538 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", |
539 | ftype, ie_len); | |
c3896d2c LCC |
540 | return; |
541 | } | |
542 | ||
54ef656b TP |
543 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
544 | (!elems.mesh_id || !elems.mesh_config)) { | |
c3896d2c LCC |
545 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
546 | return; | |
547 | } | |
548 | /* Note the lines below are correct, the llid in the frame is the plid | |
549 | * from the point of view of this host. | |
550 | */ | |
8db09850 | 551 | memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); |
54ef656b | 552 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
8db09850 TP |
553 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
554 | memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); | |
c3896d2c | 555 | |
d0709a65 JB |
556 | rcu_read_lock(); |
557 | ||
abe60632 | 558 | sta = sta_info_get(sdata, mgmt->sa); |
54ef656b | 559 | if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { |
c3896d2c | 560 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
d0709a65 | 561 | rcu_read_unlock(); |
c3896d2c LCC |
562 | return; |
563 | } | |
564 | ||
55335137 | 565 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
3d4f9699 | 566 | !rssi_threshold_check(sta, sdata)) { |
55335137 | 567 | mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 568 | mgmt->sa); |
55335137 AN |
569 | rcu_read_unlock(); |
570 | return; | |
571 | } | |
572 | ||
c2c98fde | 573 | if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { |
53e80511 JC |
574 | mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); |
575 | rcu_read_unlock(); | |
576 | return; | |
577 | } | |
578 | ||
57cf8043 | 579 | if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { |
d0709a65 | 580 | rcu_read_unlock(); |
c3896d2c LCC |
581 | return; |
582 | } | |
583 | ||
584 | /* Now we will figure out the appropriate event... */ | |
585 | event = PLINK_UNDEFINED; | |
54ef656b | 586 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
f743ff49 | 587 | !mesh_matches_local(sdata, &elems)) { |
d12c7452 | 588 | matches_local = false; |
c3896d2c | 589 | switch (ftype) { |
54ef656b | 590 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c LCC |
591 | event = OPN_RJCT; |
592 | break; | |
54ef656b | 593 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c LCC |
594 | event = CNF_RJCT; |
595 | break; | |
54ef656b | 596 | default: |
c3896d2c LCC |
597 | break; |
598 | } | |
d12c7452 CL |
599 | } |
600 | ||
601 | if (!sta && !matches_local) { | |
602 | rcu_read_unlock(); | |
54ef656b | 603 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
d12c7452 | 604 | llid = 0; |
54ef656b TP |
605 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
606 | mgmt->sa, llid, plid, reason); | |
d12c7452 | 607 | return; |
c3896d2c | 608 | } else if (!sta) { |
54ef656b | 609 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ |
c3896d2c LCC |
610 | if (!mesh_plink_free_count(sdata)) { |
611 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
73651ee6 JB |
612 | rcu_read_unlock(); |
613 | return; | |
614 | } | |
c3896d2c | 615 | event = OPN_ACPT; |
d12c7452 | 616 | } else if (matches_local) { |
c3896d2c | 617 | switch (ftype) { |
54ef656b | 618 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 619 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 620 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
621 | event = OPN_IGNR; |
622 | else | |
623 | event = OPN_ACPT; | |
624 | break; | |
54ef656b | 625 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c | 626 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 627 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
628 | event = CNF_IGNR; |
629 | else | |
630 | event = CNF_ACPT; | |
631 | break; | |
54ef656b | 632 | case WLAN_SP_MESH_PEERING_CLOSE: |
57cf8043 | 633 | if (sta->plink_state == NL80211_PLINK_ESTAB) |
c3896d2c LCC |
634 | /* Do not check for llid or plid. This does not |
635 | * follow the standard but since multiple plinks | |
636 | * per sta are not supported, it is necessary in | |
637 | * order to avoid a livelock when MP A sees an | |
638 | * establish peer link to MP B but MP B does not | |
639 | * see it. This can be caused by a timeout in | |
640 | * B's peer link establishment or B beign | |
641 | * restarted. | |
642 | */ | |
643 | event = CLS_ACPT; | |
644 | else if (sta->plid != plid) | |
645 | event = CLS_IGNR; | |
646 | else if (ie_len == 7 && sta->llid != llid) | |
647 | event = CLS_IGNR; | |
648 | else | |
649 | event = CLS_ACPT; | |
650 | break; | |
651 | default: | |
652 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
d0709a65 | 653 | rcu_read_unlock(); |
c3896d2c LCC |
654 | return; |
655 | } | |
54ab1ffb TP |
656 | } |
657 | ||
658 | if (event == OPN_ACPT) { | |
659 | /* allocate sta entry if necessary and update info */ | |
f743ff49 | 660 | sta = mesh_peer_init(sdata, mgmt->sa, &elems); |
54ab1ffb TP |
661 | if (!sta) { |
662 | mpl_dbg("Mesh plink: failed to init peer!\n"); | |
663 | rcu_read_unlock(); | |
664 | return; | |
665 | } | |
c3896d2c LCC |
666 | } |
667 | ||
1460dd15 RP |
668 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
669 | mgmt->sa, mplstates[sta->plink_state], | |
0c68ae26 JB |
670 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
671 | event); | |
c3896d2c | 672 | reason = 0; |
54ab1ffb | 673 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
674 | switch (sta->plink_state) { |
675 | /* spin_unlock as soon as state is updated at each case */ | |
57cf8043 | 676 | case NL80211_PLINK_LISTEN: |
c3896d2c LCC |
677 | switch (event) { |
678 | case CLS_ACPT: | |
679 | mesh_plink_fsm_restart(sta); | |
07346f81 | 680 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
681 | break; |
682 | case OPN_ACPT: | |
57cf8043 | 683 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
684 | sta->plid = plid; |
685 | get_random_bytes(&llid, 2); | |
686 | sta->llid = llid; | |
687 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 688 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
689 | mesh_plink_frame_tx(sdata, |
690 | WLAN_SP_MESH_PEERING_OPEN, | |
691 | sta->sta.addr, llid, 0, 0); | |
692 | mesh_plink_frame_tx(sdata, | |
693 | WLAN_SP_MESH_PEERING_CONFIRM, | |
694 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
695 | break; |
696 | default: | |
07346f81 | 697 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
698 | break; |
699 | } | |
700 | break; | |
701 | ||
57cf8043 | 702 | case NL80211_PLINK_OPN_SNT: |
c3896d2c LCC |
703 | switch (event) { |
704 | case OPN_RJCT: | |
705 | case CNF_RJCT: | |
54ef656b | 706 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
707 | case CLS_ACPT: |
708 | if (!reason) | |
54ef656b | 709 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 710 | sta->reason = reason; |
57cf8043 | 711 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
712 | if (!mod_plink_timer(sta, |
713 | dot11MeshHoldingTimeout(sdata))) | |
714 | sta->ignore_plink_timer = true; | |
715 | ||
716 | llid = sta->llid; | |
07346f81 | 717 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
718 | mesh_plink_frame_tx(sdata, |
719 | WLAN_SP_MESH_PEERING_CLOSE, | |
720 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
721 | break; |
722 | case OPN_ACPT: | |
723 | /* retry timer is left untouched */ | |
57cf8043 | 724 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
725 | sta->plid = plid; |
726 | llid = sta->llid; | |
07346f81 | 727 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
728 | mesh_plink_frame_tx(sdata, |
729 | WLAN_SP_MESH_PEERING_CONFIRM, | |
730 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
731 | break; |
732 | case CNF_ACPT: | |
57cf8043 | 733 | sta->plink_state = NL80211_PLINK_CNF_RCVD; |
c3896d2c LCC |
734 | if (!mod_plink_timer(sta, |
735 | dot11MeshConfirmTimeout(sdata))) | |
736 | sta->ignore_plink_timer = true; | |
737 | ||
07346f81 | 738 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
739 | break; |
740 | default: | |
07346f81 | 741 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
742 | break; |
743 | } | |
744 | break; | |
745 | ||
57cf8043 | 746 | case NL80211_PLINK_OPN_RCVD: |
c3896d2c LCC |
747 | switch (event) { |
748 | case OPN_RJCT: | |
749 | case CNF_RJCT: | |
54ef656b | 750 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
751 | case CLS_ACPT: |
752 | if (!reason) | |
54ef656b | 753 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 754 | sta->reason = reason; |
57cf8043 | 755 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
756 | if (!mod_plink_timer(sta, |
757 | dot11MeshHoldingTimeout(sdata))) | |
758 | sta->ignore_plink_timer = true; | |
759 | ||
760 | llid = sta->llid; | |
07346f81 | 761 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
762 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
763 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
764 | break; |
765 | case OPN_ACPT: | |
766 | llid = sta->llid; | |
07346f81 | 767 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
768 | mesh_plink_frame_tx(sdata, |
769 | WLAN_SP_MESH_PEERING_CONFIRM, | |
770 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
771 | break; |
772 | case CNF_ACPT: | |
d0709a65 | 773 | del_timer(&sta->plink_timer); |
57cf8043 | 774 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 775 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
776 | mesh_plink_inc_estab_count(sdata); |
777 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
778 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
779 | sta->sta.addr); | |
c3896d2c LCC |
780 | break; |
781 | default: | |
07346f81 | 782 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
783 | break; |
784 | } | |
785 | break; | |
786 | ||
57cf8043 | 787 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
788 | switch (event) { |
789 | case OPN_RJCT: | |
790 | case CNF_RJCT: | |
54ef656b | 791 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
792 | case CLS_ACPT: |
793 | if (!reason) | |
54ef656b | 794 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 795 | sta->reason = reason; |
57cf8043 | 796 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
797 | if (!mod_plink_timer(sta, |
798 | dot11MeshHoldingTimeout(sdata))) | |
799 | sta->ignore_plink_timer = true; | |
800 | ||
801 | llid = sta->llid; | |
07346f81 | 802 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
803 | mesh_plink_frame_tx(sdata, |
804 | WLAN_SP_MESH_PEERING_CLOSE, | |
805 | sta->sta.addr, llid, plid, reason); | |
ff59dc76 | 806 | break; |
c3896d2c | 807 | case OPN_ACPT: |
d0709a65 | 808 | del_timer(&sta->plink_timer); |
57cf8043 | 809 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 810 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
811 | mesh_plink_inc_estab_count(sdata); |
812 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
813 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
814 | sta->sta.addr); | |
54ef656b TP |
815 | mesh_plink_frame_tx(sdata, |
816 | WLAN_SP_MESH_PEERING_CONFIRM, | |
817 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
818 | break; |
819 | default: | |
07346f81 | 820 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
821 | break; |
822 | } | |
823 | break; | |
824 | ||
57cf8043 | 825 | case NL80211_PLINK_ESTAB: |
c3896d2c LCC |
826 | switch (event) { |
827 | case CLS_ACPT: | |
54ef656b | 828 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 829 | sta->reason = reason; |
c9370197 | 830 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 831 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c | 832 | llid = sta->llid; |
d0709a65 | 833 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 834 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
835 | if (deactivated) |
836 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
54ef656b TP |
837 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
838 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
839 | break; |
840 | case OPN_ACPT: | |
841 | llid = sta->llid; | |
07346f81 | 842 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
843 | mesh_plink_frame_tx(sdata, |
844 | WLAN_SP_MESH_PEERING_CONFIRM, | |
845 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
846 | break; |
847 | default: | |
07346f81 | 848 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
849 | break; |
850 | } | |
851 | break; | |
57cf8043 | 852 | case NL80211_PLINK_HOLDING: |
c3896d2c LCC |
853 | switch (event) { |
854 | case CLS_ACPT: | |
d0709a65 | 855 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 856 | sta->ignore_plink_timer = 1; |
c3896d2c | 857 | mesh_plink_fsm_restart(sta); |
07346f81 | 858 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
859 | break; |
860 | case OPN_ACPT: | |
861 | case CNF_ACPT: | |
862 | case OPN_RJCT: | |
863 | case CNF_RJCT: | |
864 | llid = sta->llid; | |
865 | reason = sta->reason; | |
07346f81 | 866 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
867 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
868 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
869 | break; |
870 | default: | |
07346f81 | 871 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
872 | } |
873 | break; | |
874 | default: | |
b4e08ea1 | 875 | /* should not get here, PLINK_BLOCKED is dealt with at the |
3ad2f3fb | 876 | * beginning of the function |
c3896d2c | 877 | */ |
07346f81 | 878 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
879 | break; |
880 | } | |
d0709a65 JB |
881 | |
882 | rcu_read_unlock(); | |
c3896d2c | 883 | } |