Commit | Line | Data |
---|---|---|
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 JB |
84 | /* |
85 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
86 | * on it in the lifecycle management section! | |
87 | */ | |
03e4497e | 88 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
739522ba TP |
89 | u8 *hw_addr, u32 rates, |
90 | struct ieee802_11_elems *elems) | |
c3896d2c | 91 | { |
d0709a65 | 92 | struct ieee80211_local *local = sdata->local; |
739522ba | 93 | struct ieee80211_supported_band *sband; |
c3896d2c LCC |
94 | struct sta_info *sta; |
95 | ||
739522ba TP |
96 | sband = local->hw.wiphy->bands[local->oper_channel->band]; |
97 | ||
c3896d2c | 98 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 99 | return NULL; |
c3896d2c | 100 | |
34e89507 | 101 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
73651ee6 JB |
102 | if (!sta) |
103 | return NULL; | |
c3896d2c | 104 | |
83d5cc01 JB |
105 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
106 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
107 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
d9a7ddb0 | 108 | |
c2c98fde | 109 | set_sta_flag(sta, WLAN_STA_WME); |
d9a7ddb0 | 110 | |
323ce79a | 111 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
739522ba | 112 | if (elems->ht_cap_elem) |
ef96a842 BG |
113 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
114 | elems->ht_cap_elem, | |
739522ba | 115 | &sta->sta.ht_cap); |
b973c31a | 116 | rate_control_rate_init(sta); |
c3896d2c LCC |
117 | |
118 | return sta; | |
119 | } | |
120 | ||
121 | /** | |
c9370197 | 122 | * __mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
123 | * |
124 | * @sta: mesh peer link to deactivate | |
125 | * | |
126 | * All mesh paths with this peer as next hop will be flushed | |
127 | * | |
07346f81 | 128 | * Locking: the caller must hold sta->lock |
c3896d2c | 129 | */ |
c9370197 | 130 | static bool __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 131 | { |
d0709a65 | 132 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c9370197 | 133 | bool deactivated = false; |
d0709a65 | 134 | |
57cf8043 | 135 | if (sta->plink_state == NL80211_PLINK_ESTAB) { |
c3896d2c | 136 | mesh_plink_dec_estab_count(sdata); |
c9370197 JL |
137 | deactivated = true; |
138 | } | |
57cf8043 | 139 | sta->plink_state = NL80211_PLINK_BLOCKED; |
c3896d2c | 140 | mesh_path_flush_by_nexthop(sta); |
c9370197 JL |
141 | |
142 | return deactivated; | |
c3896d2c LCC |
143 | } |
144 | ||
902acc78 | 145 | /** |
c9370197 | 146 | * mesh_plink_deactivate - deactivate mesh peer link |
902acc78 JB |
147 | * |
148 | * @sta: mesh peer link to deactivate | |
149 | * | |
150 | * All mesh paths with this peer as next hop will be flushed | |
151 | */ | |
152 | void mesh_plink_deactivate(struct sta_info *sta) | |
153 | { | |
c9370197 JL |
154 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
155 | bool deactivated; | |
156 | ||
07346f81 | 157 | spin_lock_bh(&sta->lock); |
c9370197 | 158 | deactivated = __mesh_plink_deactivate(sta); |
ba4a14e1 TP |
159 | sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); |
160 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, | |
161 | sta->sta.addr, sta->llid, sta->plid, | |
162 | sta->reason); | |
07346f81 | 163 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
164 | |
165 | if (deactivated) | |
166 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
902acc78 JB |
167 | } |
168 | ||
f698d856 | 169 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
54ef656b TP |
170 | enum ieee80211_self_protected_actioncode action, |
171 | u8 *da, __le16 llid, __le16 plid, __le16 reason) { | |
f698d856 | 172 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 173 | struct sk_buff *skb; |
c3896d2c LCC |
174 | struct ieee80211_mgmt *mgmt; |
175 | bool include_plid = false; | |
8db09850 | 176 | u16 peering_proto = 0; |
3b69a9c5 TP |
177 | u8 *pos, ie_len = 4; |
178 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
179 | sizeof(mgmt->u.action.u.self_prot); | |
180 | ||
65e8b0cc | 181 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
182 | hdr_len + |
183 | 2 + /* capability info */ | |
184 | 2 + /* AID */ | |
185 | 2 + 8 + /* supported rates */ | |
186 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
187 | 2 + sdata->u.mesh.mesh_id_len + | |
188 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 189 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 190 | 2 + sizeof(struct ieee80211_ht_operation) + |
3b69a9c5 TP |
191 | 2 + 8 + /* peering IE */ |
192 | sdata->u.mesh.ie_len); | |
c3896d2c LCC |
193 | if (!skb) |
194 | return -1; | |
65e8b0cc | 195 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
196 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
197 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
198 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
199 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 200 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 201 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 202 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
203 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
204 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 205 | |
8db09850 TP |
206 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
207 | /* capability info */ | |
208 | pos = skb_put(skb, 2); | |
209 | memset(pos, 0, 2); | |
54ef656b | 210 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
211 | /* AID */ |
212 | pos = skb_put(skb, 2); | |
77fa76bb | 213 | memcpy(pos + 2, &plid, 2); |
c3896d2c | 214 | } |
657c3e0c AN |
215 | if (ieee80211_add_srates_ie(&sdata->vif, skb, true) || |
216 | ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) || | |
082ebb0c TP |
217 | mesh_add_rsn_ie(skb, sdata) || |
218 | mesh_add_meshid_ie(skb, sdata) || | |
219 | mesh_add_meshconf_ie(skb, sdata)) | |
220 | return -1; | |
8db09850 TP |
221 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
222 | if (mesh_add_meshid_ie(skb, sdata)) | |
223 | return -1; | |
c3896d2c LCC |
224 | } |
225 | ||
8db09850 | 226 | /* Add Mesh Peering Management element */ |
c3896d2c | 227 | switch (action) { |
54ef656b | 228 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 229 | break; |
54ef656b | 230 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 231 | ie_len += 2; |
c3896d2c LCC |
232 | include_plid = true; |
233 | break; | |
54ef656b | 234 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
235 | if (plid) { |
236 | ie_len += 2; | |
c3896d2c LCC |
237 | include_plid = true; |
238 | } | |
8db09850 | 239 | ie_len += 2; /* reason code */ |
c3896d2c | 240 | break; |
8db09850 TP |
241 | default: |
242 | return -EINVAL; | |
c3896d2c LCC |
243 | } |
244 | ||
8db09850 TP |
245 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
246 | return -ENOMEM; | |
247 | ||
c3896d2c | 248 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 249 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 250 | *pos++ = ie_len; |
8db09850 TP |
251 | memcpy(pos, &peering_proto, 2); |
252 | pos += 2; | |
c3896d2c | 253 | memcpy(pos, &llid, 2); |
8db09850 | 254 | pos += 2; |
c3896d2c | 255 | if (include_plid) { |
c3896d2c | 256 | memcpy(pos, &plid, 2); |
8db09850 | 257 | pos += 2; |
c3896d2c | 258 | } |
54ef656b | 259 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
c3896d2c | 260 | memcpy(pos, &reason, 2); |
8db09850 | 261 | pos += 2; |
c3896d2c | 262 | } |
176f3608 TP |
263 | |
264 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
265 | if (mesh_add_ht_cap_ie(skb, sdata) || | |
074d46d1 | 266 | mesh_add_ht_oper_ie(skb, sdata)) |
176f3608 TP |
267 | return -1; |
268 | } | |
269 | ||
8db09850 TP |
270 | if (mesh_add_vendor_ies(skb, sdata)) |
271 | return -1; | |
c3896d2c | 272 | |
62ae67be | 273 | ieee80211_tx_skb(sdata, skb); |
c3896d2c LCC |
274 | return 0; |
275 | } | |
276 | ||
1570ca59 JC |
277 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, |
278 | struct ieee80211_sub_if_data *sdata, | |
279 | struct ieee802_11_elems *elems) | |
c3896d2c | 280 | { |
f698d856 | 281 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
282 | struct sta_info *sta; |
283 | ||
d0709a65 JB |
284 | rcu_read_lock(); |
285 | ||
abe60632 | 286 | sta = sta_info_get(sdata, hw_addr); |
c3896d2c | 287 | if (!sta) { |
34e89507 | 288 | rcu_read_unlock(); |
1570ca59 JC |
289 | /* Userspace handles peer allocation when security is enabled |
290 | * */ | |
b130e5ce | 291 | if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) |
1570ca59 JC |
292 | cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr, |
293 | elems->ie_start, elems->total_len, | |
294 | GFP_KERNEL); | |
295 | else | |
739522ba | 296 | sta = mesh_plink_alloc(sdata, hw_addr, rates, elems); |
34e89507 | 297 | if (!sta) |
73651ee6 | 298 | return; |
34e89507 | 299 | if (sta_info_insert_rcu(sta)) { |
d0709a65 | 300 | rcu_read_unlock(); |
c3896d2c | 301 | return; |
d0709a65 | 302 | } |
c3896d2c LCC |
303 | } |
304 | ||
305 | sta->last_rx = jiffies; | |
323ce79a | 306 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
1570ca59 | 307 | if (mesh_peer_accepts_plinks(elems) && |
57cf8043 | 308 | sta->plink_state == NL80211_PLINK_LISTEN && |
472dbc45 | 309 | sdata->u.mesh.accepting_plinks && |
55335137 | 310 | sdata->u.mesh.mshcfg.auto_open_plinks && |
3d4f9699 | 311 | rssi_threshold_check(sta, sdata)) |
c3896d2c LCC |
312 | mesh_plink_open(sta); |
313 | ||
d0709a65 | 314 | rcu_read_unlock(); |
c3896d2c LCC |
315 | } |
316 | ||
317 | static void mesh_plink_timer(unsigned long data) | |
318 | { | |
319 | struct sta_info *sta; | |
320 | __le16 llid, plid, reason; | |
c3896d2c | 321 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 322 | |
d0709a65 JB |
323 | /* |
324 | * This STA is valid because sta_info_destroy() will | |
325 | * del_timer_sync() this timer after having made sure | |
326 | * it cannot be readded (by deleting the plink.) | |
327 | */ | |
c3896d2c LCC |
328 | sta = (struct sta_info *) data; |
329 | ||
5bb644a0 JB |
330 | if (sta->sdata->local->quiescing) { |
331 | sta->plink_timer_was_running = true; | |
332 | return; | |
333 | } | |
334 | ||
07346f81 | 335 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
336 | if (sta->ignore_plink_timer) { |
337 | sta->ignore_plink_timer = false; | |
07346f81 | 338 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
339 | return; |
340 | } | |
0c68ae26 JB |
341 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
342 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
343 | reason = 0; |
344 | llid = sta->llid; | |
345 | plid = sta->plid; | |
d0709a65 | 346 | sdata = sta->sdata; |
c3896d2c LCC |
347 | |
348 | switch (sta->plink_state) { | |
57cf8043 JC |
349 | case NL80211_PLINK_OPN_RCVD: |
350 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c LCC |
351 | /* retry timer */ |
352 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
353 | u32 rand; | |
0c68ae26 JB |
354 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
355 | sta->sta.addr, sta->plink_retries, | |
356 | sta->plink_timeout); | |
c3896d2c LCC |
357 | get_random_bytes(&rand, sizeof(u32)); |
358 | sta->plink_timeout = sta->plink_timeout + | |
359 | rand % sta->plink_timeout; | |
360 | ++sta->plink_retries; | |
d0709a65 | 361 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 362 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
363 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
364 | sta->sta.addr, llid, 0, 0); | |
c3896d2c LCC |
365 | break; |
366 | } | |
54ef656b | 367 | reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); |
c3896d2c | 368 | /* fall through on else */ |
57cf8043 | 369 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
370 | /* confirm timer */ |
371 | if (!reason) | |
54ef656b | 372 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); |
57cf8043 | 373 | sta->plink_state = NL80211_PLINK_HOLDING; |
d0709a65 | 374 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 375 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
376 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
377 | sta->sta.addr, llid, plid, reason); | |
c3896d2c | 378 | break; |
57cf8043 | 379 | case NL80211_PLINK_HOLDING: |
c3896d2c | 380 | /* holding timer */ |
d0709a65 | 381 | del_timer(&sta->plink_timer); |
c3896d2c | 382 | mesh_plink_fsm_restart(sta); |
07346f81 | 383 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
384 | break; |
385 | default: | |
07346f81 | 386 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
387 | break; |
388 | } | |
c3896d2c LCC |
389 | } |
390 | ||
5bb644a0 JB |
391 | #ifdef CONFIG_PM |
392 | void mesh_plink_quiesce(struct sta_info *sta) | |
393 | { | |
394 | if (del_timer_sync(&sta->plink_timer)) | |
395 | sta->plink_timer_was_running = true; | |
396 | } | |
397 | ||
398 | void mesh_plink_restart(struct sta_info *sta) | |
399 | { | |
400 | if (sta->plink_timer_was_running) { | |
401 | add_timer(&sta->plink_timer); | |
402 | sta->plink_timer_was_running = false; | |
403 | } | |
404 | } | |
405 | #endif | |
406 | ||
c3896d2c LCC |
407 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
408 | { | |
409 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
410 | sta->plink_timer.data = (unsigned long) sta; | |
411 | sta->plink_timer.function = mesh_plink_timer; | |
412 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
413 | add_timer(&sta->plink_timer); |
414 | } | |
415 | ||
416 | int mesh_plink_open(struct sta_info *sta) | |
417 | { | |
418 | __le16 llid; | |
d0709a65 | 419 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 420 | |
c2c98fde | 421 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
53e80511 JC |
422 | return -EPERM; |
423 | ||
07346f81 | 424 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
425 | get_random_bytes(&llid, 2); |
426 | sta->llid = llid; | |
57cf8043 | 427 | if (sta->plink_state != NL80211_PLINK_LISTEN) { |
07346f81 | 428 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
429 | return -EBUSY; |
430 | } | |
57cf8043 | 431 | sta->plink_state = NL80211_PLINK_OPN_SNT; |
c3896d2c | 432 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 433 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
434 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
435 | sta->sta.addr); | |
c3896d2c | 436 | |
54ef656b | 437 | return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
17741cdc | 438 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
439 | } |
440 | ||
441 | void mesh_plink_block(struct sta_info *sta) | |
442 | { | |
c9370197 JL |
443 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
444 | bool deactivated; | |
445 | ||
07346f81 | 446 | spin_lock_bh(&sta->lock); |
c9370197 | 447 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 448 | sta->plink_state = NL80211_PLINK_BLOCKED; |
07346f81 | 449 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
450 | |
451 | if (deactivated) | |
452 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
c3896d2c LCC |
453 | } |
454 | ||
c3896d2c | 455 | |
f698d856 | 456 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
457 | size_t len, struct ieee80211_rx_status *rx_status) |
458 | { | |
d0709a65 | 459 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
460 | struct ieee802_11_elems elems; |
461 | struct sta_info *sta; | |
462 | enum plink_event event; | |
54ef656b | 463 | enum ieee80211_self_protected_actioncode ftype; |
c3896d2c | 464 | size_t baselen; |
d12c7452 | 465 | bool deactivated, matches_local = true; |
c3896d2c LCC |
466 | u8 ie_len; |
467 | u8 *baseaddr; | |
9ebb61a2 | 468 | u32 rates, basic_rates = 0; |
c3896d2c | 469 | __le16 plid, llid, reason; |
1460dd15 RP |
470 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
471 | static const char *mplstates[] = { | |
57cf8043 JC |
472 | [NL80211_PLINK_LISTEN] = "LISTEN", |
473 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
474 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
475 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
476 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
477 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
478 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
1460dd15 RP |
479 | }; |
480 | #endif | |
c3896d2c | 481 | |
9c80d3dc JB |
482 | /* need action_code, aux */ |
483 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
484 | return; | |
485 | ||
c3896d2c LCC |
486 | if (is_multicast_ether_addr(mgmt->da)) { |
487 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
488 | return; | |
489 | } | |
490 | ||
8db09850 TP |
491 | baseaddr = mgmt->u.action.u.self_prot.variable; |
492 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
493 | if (mgmt->u.action.u.self_prot.action_code == | |
54ef656b | 494 | WLAN_SP_MESH_PEERING_CONFIRM) { |
c3896d2c | 495 | baseaddr += 4; |
70bdb6b2 | 496 | baselen += 4; |
c3896d2c LCC |
497 | } |
498 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
8db09850 | 499 | if (!elems.peering) { |
c3896d2c LCC |
500 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
501 | return; | |
502 | } | |
b130e5ce JC |
503 | if (elems.rsn_len && |
504 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { | |
5cff5e01 JC |
505 | mpl_dbg("Mesh plink: can't establish link with secure peer\n"); |
506 | return; | |
507 | } | |
c3896d2c | 508 | |
8db09850 TP |
509 | ftype = mgmt->u.action.u.self_prot.action_code; |
510 | ie_len = elems.peering_len; | |
511 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || | |
512 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
513 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
514 | && ie_len != 8)) { | |
0938393f RP |
515 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", |
516 | ftype, ie_len); | |
c3896d2c LCC |
517 | return; |
518 | } | |
519 | ||
54ef656b TP |
520 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
521 | (!elems.mesh_id || !elems.mesh_config)) { | |
c3896d2c LCC |
522 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
523 | return; | |
524 | } | |
525 | /* Note the lines below are correct, the llid in the frame is the plid | |
526 | * from the point of view of this host. | |
527 | */ | |
8db09850 | 528 | memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); |
54ef656b | 529 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
8db09850 TP |
530 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
531 | memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); | |
c3896d2c | 532 | |
d0709a65 JB |
533 | rcu_read_lock(); |
534 | ||
abe60632 | 535 | sta = sta_info_get(sdata, mgmt->sa); |
54ef656b | 536 | if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { |
c3896d2c | 537 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
d0709a65 | 538 | rcu_read_unlock(); |
c3896d2c LCC |
539 | return; |
540 | } | |
541 | ||
55335137 | 542 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
3d4f9699 | 543 | !rssi_threshold_check(sta, sdata)) { |
55335137 | 544 | mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 545 | mgmt->sa); |
55335137 AN |
546 | rcu_read_unlock(); |
547 | return; | |
548 | } | |
549 | ||
c2c98fde | 550 | if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { |
53e80511 JC |
551 | mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); |
552 | rcu_read_unlock(); | |
553 | return; | |
554 | } | |
555 | ||
57cf8043 | 556 | if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { |
d0709a65 | 557 | rcu_read_unlock(); |
c3896d2c LCC |
558 | return; |
559 | } | |
560 | ||
561 | /* Now we will figure out the appropriate event... */ | |
562 | event = PLINK_UNDEFINED; | |
9ebb61a2 AN |
563 | rates = ieee80211_sta_get_rates(local, &elems, |
564 | rx_status->band, &basic_rates); | |
565 | ||
54ef656b | 566 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
fe40cb62 | 567 | (!mesh_matches_local(&elems, sdata, basic_rates))) { |
d12c7452 | 568 | matches_local = false; |
c3896d2c | 569 | switch (ftype) { |
54ef656b | 570 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c LCC |
571 | event = OPN_RJCT; |
572 | break; | |
54ef656b | 573 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c LCC |
574 | event = CNF_RJCT; |
575 | break; | |
54ef656b | 576 | default: |
c3896d2c LCC |
577 | break; |
578 | } | |
d12c7452 CL |
579 | } |
580 | ||
581 | if (!sta && !matches_local) { | |
582 | rcu_read_unlock(); | |
54ef656b | 583 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
d12c7452 | 584 | llid = 0; |
54ef656b TP |
585 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
586 | mgmt->sa, llid, plid, reason); | |
d12c7452 | 587 | return; |
c3896d2c | 588 | } else if (!sta) { |
54ef656b | 589 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ |
34e89507 JB |
590 | |
591 | rcu_read_unlock(); | |
592 | ||
c3896d2c LCC |
593 | if (!mesh_plink_free_count(sdata)) { |
594 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
595 | return; | |
596 | } | |
739522ba | 597 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems); |
73651ee6 | 598 | if (!sta) { |
c3896d2c LCC |
599 | mpl_dbg("Mesh plink error: plink table full\n"); |
600 | return; | |
601 | } | |
34e89507 | 602 | if (sta_info_insert_rcu(sta)) { |
73651ee6 JB |
603 | rcu_read_unlock(); |
604 | return; | |
605 | } | |
c3896d2c | 606 | event = OPN_ACPT; |
07346f81 | 607 | spin_lock_bh(&sta->lock); |
d12c7452 | 608 | } else if (matches_local) { |
07346f81 | 609 | spin_lock_bh(&sta->lock); |
c3896d2c | 610 | switch (ftype) { |
54ef656b | 611 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 612 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 613 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
614 | event = OPN_IGNR; |
615 | else | |
616 | event = OPN_ACPT; | |
617 | break; | |
54ef656b | 618 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c | 619 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 620 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
621 | event = CNF_IGNR; |
622 | else | |
623 | event = CNF_ACPT; | |
624 | break; | |
54ef656b | 625 | case WLAN_SP_MESH_PEERING_CLOSE: |
57cf8043 | 626 | if (sta->plink_state == NL80211_PLINK_ESTAB) |
c3896d2c LCC |
627 | /* Do not check for llid or plid. This does not |
628 | * follow the standard but since multiple plinks | |
629 | * per sta are not supported, it is necessary in | |
630 | * order to avoid a livelock when MP A sees an | |
631 | * establish peer link to MP B but MP B does not | |
632 | * see it. This can be caused by a timeout in | |
633 | * B's peer link establishment or B beign | |
634 | * restarted. | |
635 | */ | |
636 | event = CLS_ACPT; | |
637 | else if (sta->plid != plid) | |
638 | event = CLS_IGNR; | |
639 | else if (ie_len == 7 && sta->llid != llid) | |
640 | event = CLS_IGNR; | |
641 | else | |
642 | event = CLS_ACPT; | |
643 | break; | |
644 | default: | |
645 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 646 | spin_unlock_bh(&sta->lock); |
d0709a65 | 647 | rcu_read_unlock(); |
c3896d2c LCC |
648 | return; |
649 | } | |
d12c7452 CL |
650 | } else { |
651 | spin_lock_bh(&sta->lock); | |
c3896d2c LCC |
652 | } |
653 | ||
1460dd15 RP |
654 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
655 | mgmt->sa, mplstates[sta->plink_state], | |
0c68ae26 JB |
656 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
657 | event); | |
c3896d2c LCC |
658 | reason = 0; |
659 | switch (sta->plink_state) { | |
660 | /* spin_unlock as soon as state is updated at each case */ | |
57cf8043 | 661 | case NL80211_PLINK_LISTEN: |
c3896d2c LCC |
662 | switch (event) { |
663 | case CLS_ACPT: | |
664 | mesh_plink_fsm_restart(sta); | |
07346f81 | 665 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
666 | break; |
667 | case OPN_ACPT: | |
57cf8043 | 668 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
669 | sta->plid = plid; |
670 | get_random_bytes(&llid, 2); | |
671 | sta->llid = llid; | |
672 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 673 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
674 | mesh_plink_frame_tx(sdata, |
675 | WLAN_SP_MESH_PEERING_OPEN, | |
676 | sta->sta.addr, llid, 0, 0); | |
677 | mesh_plink_frame_tx(sdata, | |
678 | WLAN_SP_MESH_PEERING_CONFIRM, | |
679 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
680 | break; |
681 | default: | |
07346f81 | 682 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
683 | break; |
684 | } | |
685 | break; | |
686 | ||
57cf8043 | 687 | case NL80211_PLINK_OPN_SNT: |
c3896d2c LCC |
688 | switch (event) { |
689 | case OPN_RJCT: | |
690 | case CNF_RJCT: | |
54ef656b | 691 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
692 | case CLS_ACPT: |
693 | if (!reason) | |
54ef656b | 694 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 695 | sta->reason = reason; |
57cf8043 | 696 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
697 | if (!mod_plink_timer(sta, |
698 | dot11MeshHoldingTimeout(sdata))) | |
699 | sta->ignore_plink_timer = true; | |
700 | ||
701 | llid = sta->llid; | |
07346f81 | 702 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
703 | mesh_plink_frame_tx(sdata, |
704 | WLAN_SP_MESH_PEERING_CLOSE, | |
705 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
706 | break; |
707 | case OPN_ACPT: | |
708 | /* retry timer is left untouched */ | |
57cf8043 | 709 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
710 | sta->plid = plid; |
711 | llid = sta->llid; | |
07346f81 | 712 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
713 | mesh_plink_frame_tx(sdata, |
714 | WLAN_SP_MESH_PEERING_CONFIRM, | |
715 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
716 | break; |
717 | case CNF_ACPT: | |
57cf8043 | 718 | sta->plink_state = NL80211_PLINK_CNF_RCVD; |
c3896d2c LCC |
719 | if (!mod_plink_timer(sta, |
720 | dot11MeshConfirmTimeout(sdata))) | |
721 | sta->ignore_plink_timer = true; | |
722 | ||
07346f81 | 723 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
724 | break; |
725 | default: | |
07346f81 | 726 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
727 | break; |
728 | } | |
729 | break; | |
730 | ||
57cf8043 | 731 | case NL80211_PLINK_OPN_RCVD: |
c3896d2c LCC |
732 | switch (event) { |
733 | case OPN_RJCT: | |
734 | case CNF_RJCT: | |
54ef656b | 735 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
736 | case CLS_ACPT: |
737 | if (!reason) | |
54ef656b | 738 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 739 | sta->reason = reason; |
57cf8043 | 740 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
741 | if (!mod_plink_timer(sta, |
742 | dot11MeshHoldingTimeout(sdata))) | |
743 | sta->ignore_plink_timer = true; | |
744 | ||
745 | llid = sta->llid; | |
07346f81 | 746 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
747 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
748 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
749 | break; |
750 | case OPN_ACPT: | |
751 | llid = sta->llid; | |
07346f81 | 752 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
753 | mesh_plink_frame_tx(sdata, |
754 | WLAN_SP_MESH_PEERING_CONFIRM, | |
755 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
756 | break; |
757 | case CNF_ACPT: | |
d0709a65 | 758 | del_timer(&sta->plink_timer); |
57cf8043 | 759 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 760 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
761 | mesh_plink_inc_estab_count(sdata); |
762 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
763 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
764 | sta->sta.addr); | |
c3896d2c LCC |
765 | break; |
766 | default: | |
07346f81 | 767 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
768 | break; |
769 | } | |
770 | break; | |
771 | ||
57cf8043 | 772 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
773 | switch (event) { |
774 | case OPN_RJCT: | |
775 | case CNF_RJCT: | |
54ef656b | 776 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
777 | case CLS_ACPT: |
778 | if (!reason) | |
54ef656b | 779 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 780 | sta->reason = reason; |
57cf8043 | 781 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
782 | if (!mod_plink_timer(sta, |
783 | dot11MeshHoldingTimeout(sdata))) | |
784 | sta->ignore_plink_timer = true; | |
785 | ||
786 | llid = sta->llid; | |
07346f81 | 787 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
788 | mesh_plink_frame_tx(sdata, |
789 | WLAN_SP_MESH_PEERING_CLOSE, | |
790 | sta->sta.addr, llid, plid, reason); | |
ff59dc76 | 791 | break; |
c3896d2c | 792 | case OPN_ACPT: |
d0709a65 | 793 | del_timer(&sta->plink_timer); |
57cf8043 | 794 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 795 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
796 | mesh_plink_inc_estab_count(sdata); |
797 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
798 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
799 | sta->sta.addr); | |
54ef656b TP |
800 | mesh_plink_frame_tx(sdata, |
801 | WLAN_SP_MESH_PEERING_CONFIRM, | |
802 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
803 | break; |
804 | default: | |
07346f81 | 805 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
806 | break; |
807 | } | |
808 | break; | |
809 | ||
57cf8043 | 810 | case NL80211_PLINK_ESTAB: |
c3896d2c LCC |
811 | switch (event) { |
812 | case CLS_ACPT: | |
54ef656b | 813 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 814 | sta->reason = reason; |
c9370197 | 815 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 816 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c | 817 | llid = sta->llid; |
d0709a65 | 818 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 819 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
820 | if (deactivated) |
821 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
54ef656b TP |
822 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
823 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
824 | break; |
825 | case OPN_ACPT: | |
826 | llid = sta->llid; | |
07346f81 | 827 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
828 | mesh_plink_frame_tx(sdata, |
829 | WLAN_SP_MESH_PEERING_CONFIRM, | |
830 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
831 | break; |
832 | default: | |
07346f81 | 833 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
834 | break; |
835 | } | |
836 | break; | |
57cf8043 | 837 | case NL80211_PLINK_HOLDING: |
c3896d2c LCC |
838 | switch (event) { |
839 | case CLS_ACPT: | |
d0709a65 | 840 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 841 | sta->ignore_plink_timer = 1; |
c3896d2c | 842 | mesh_plink_fsm_restart(sta); |
07346f81 | 843 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
844 | break; |
845 | case OPN_ACPT: | |
846 | case CNF_ACPT: | |
847 | case OPN_RJCT: | |
848 | case CNF_RJCT: | |
849 | llid = sta->llid; | |
850 | reason = sta->reason; | |
07346f81 | 851 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
852 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
853 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
854 | break; |
855 | default: | |
07346f81 | 856 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
857 | } |
858 | break; | |
859 | default: | |
b4e08ea1 | 860 | /* should not get here, PLINK_BLOCKED is dealt with at the |
3ad2f3fb | 861 | * beginning of the function |
c3896d2c | 862 | */ |
07346f81 | 863 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
864 | break; |
865 | } | |
d0709a65 JB |
866 | |
867 | rcu_read_unlock(); | |
c3896d2c | 868 | } |