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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 | ||
0938393f RP |
22 | #define PLINK_GET_LLID(p) (p + 4) |
23 | #define PLINK_GET_PLID(p) (p + 6) | |
c3896d2c LCC |
24 | |
25 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
26 | jiffies + HZ * t / 1000)) | |
27 | ||
28 | /* Peer link cancel reasons, all subject to ANA approval */ | |
29 | #define MESH_LINK_CANCELLED 2 | |
30 | #define MESH_MAX_NEIGHBORS 3 | |
31 | #define MESH_CAPABILITY_POLICY_VIOLATION 4 | |
32 | #define MESH_CLOSE_RCVD 5 | |
33 | #define MESH_MAX_RETRIES 6 | |
34 | #define MESH_CONFIRM_TIMEOUT 7 | |
35 | #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS 8 | |
36 | #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9 | |
37 | #define MESH_SECURITY_FAILED_VERIFICATION 10 | |
38 | ||
472dbc45 JB |
39 | #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) |
40 | #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) | |
41 | #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) | |
42 | #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) | |
43 | #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) | |
c3896d2c LCC |
44 | |
45 | enum plink_frame_type { | |
46 | PLINK_OPEN = 0, | |
47 | PLINK_CONFIRM, | |
48 | PLINK_CLOSE | |
49 | }; | |
50 | ||
51 | enum plink_event { | |
52 | PLINK_UNDEFINED, | |
53 | OPN_ACPT, | |
54 | OPN_RJCT, | |
55 | OPN_IGNR, | |
56 | CNF_ACPT, | |
57 | CNF_RJCT, | |
58 | CNF_IGNR, | |
59 | CLS_ACPT, | |
60 | CLS_IGNR | |
61 | }; | |
62 | ||
63 | static inline | |
64 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
65 | { | |
472dbc45 | 66 | atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 67 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
68 | } |
69 | ||
70 | static inline | |
71 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
72 | { | |
472dbc45 | 73 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 74 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
75 | } |
76 | ||
77 | /** | |
78 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
79 | * | |
23c7a29c | 80 | * @sta: mesh peer link to restart |
c3896d2c | 81 | * |
07346f81 | 82 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
83 | */ |
84 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
85 | { | |
b4e08ea1 | 86 | sta->plink_state = PLINK_LISTEN; |
37659ff8 LCC |
87 | sta->llid = sta->plid = sta->reason = 0; |
88 | sta->plink_retries = 0; | |
c3896d2c LCC |
89 | } |
90 | ||
93e5deb1 JB |
91 | /* |
92 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
93 | * on it in the lifecycle management section! | |
94 | */ | |
03e4497e | 95 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
881d948c | 96 | u8 *hw_addr, u32 rates) |
c3896d2c | 97 | { |
d0709a65 | 98 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
99 | struct sta_info *sta; |
100 | ||
c3896d2c | 101 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 102 | return NULL; |
c3896d2c | 103 | |
34e89507 | 104 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
73651ee6 JB |
105 | if (!sta) |
106 | return NULL; | |
c3896d2c | 107 | |
07346f81 | 108 | sta->flags = WLAN_STA_AUTHORIZED; |
323ce79a | 109 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
b973c31a | 110 | rate_control_rate_init(sta); |
c3896d2c LCC |
111 | |
112 | return sta; | |
113 | } | |
114 | ||
115 | /** | |
c9370197 | 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 | * | |
07346f81 | 122 | * Locking: the caller must hold sta->lock |
c3896d2c | 123 | */ |
c9370197 | 124 | static bool __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 125 | { |
d0709a65 | 126 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c9370197 | 127 | bool deactivated = false; |
d0709a65 | 128 | |
c9370197 | 129 | if (sta->plink_state == PLINK_ESTAB) { |
c3896d2c | 130 | mesh_plink_dec_estab_count(sdata); |
c9370197 JL |
131 | deactivated = true; |
132 | } | |
b4e08ea1 | 133 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c | 134 | mesh_path_flush_by_nexthop(sta); |
c9370197 JL |
135 | |
136 | return deactivated; | |
c3896d2c LCC |
137 | } |
138 | ||
902acc78 | 139 | /** |
c9370197 | 140 | * mesh_plink_deactivate - deactivate mesh peer link |
902acc78 JB |
141 | * |
142 | * @sta: mesh peer link to deactivate | |
143 | * | |
144 | * All mesh paths with this peer as next hop will be flushed | |
145 | */ | |
146 | void mesh_plink_deactivate(struct sta_info *sta) | |
147 | { | |
c9370197 JL |
148 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
149 | bool deactivated; | |
150 | ||
07346f81 | 151 | spin_lock_bh(&sta->lock); |
c9370197 | 152 | deactivated = __mesh_plink_deactivate(sta); |
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, |
c3896d2c LCC |
160 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
161 | __le16 reason) { | |
f698d856 | 162 | struct ieee80211_local *local = sdata->local; |
c80d545d | 163 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 + |
581a8b0f | 164 | sdata->u.mesh.ie_len); |
c3896d2c LCC |
165 | struct ieee80211_mgmt *mgmt; |
166 | bool include_plid = false; | |
0938393f | 167 | static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A }; |
c3896d2c LCC |
168 | u8 *pos; |
169 | int ie_len; | |
170 | ||
171 | if (!skb) | |
172 | return -1; | |
173 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
174 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
175 | * common action part (1) | |
176 | */ | |
177 | mgmt = (struct ieee80211_mgmt *) | |
178 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
179 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
e7827a70 HH |
180 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
181 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 182 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 183 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
c3896d2c | 184 | /* BSSID is left zeroed, wildcard value */ |
97ad9139 | 185 | mgmt->u.action.category = WLAN_CATEGORY_MESH_PLINK; |
c3896d2c LCC |
186 | mgmt->u.action.u.plink_action.action_code = action; |
187 | ||
188 | if (action == PLINK_CLOSE) | |
189 | mgmt->u.action.u.plink_action.aux = reason; | |
190 | else { | |
191 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
192 | if (action == PLINK_CONFIRM) { | |
193 | pos = skb_put(skb, 4); | |
194 | /* two-byte status code followed by two-byte AID */ | |
77fa76bb RP |
195 | memset(pos, 0, 2); |
196 | memcpy(pos + 2, &plid, 2); | |
c3896d2c | 197 | } |
f698d856 | 198 | mesh_mgmt_ies_add(skb, sdata); |
c3896d2c LCC |
199 | } |
200 | ||
201 | /* Add Peer Link Management element */ | |
202 | switch (action) { | |
203 | case PLINK_OPEN: | |
0938393f | 204 | ie_len = 6; |
c3896d2c LCC |
205 | break; |
206 | case PLINK_CONFIRM: | |
0938393f | 207 | ie_len = 8; |
c3896d2c LCC |
208 | include_plid = true; |
209 | break; | |
210 | case PLINK_CLOSE: | |
211 | default: | |
212 | if (!plid) | |
0938393f | 213 | ie_len = 8; |
c3896d2c | 214 | else { |
0938393f | 215 | ie_len = 10; |
c3896d2c LCC |
216 | include_plid = true; |
217 | } | |
218 | break; | |
219 | } | |
220 | ||
221 | pos = skb_put(skb, 2 + ie_len); | |
222 | *pos++ = WLAN_EID_PEER_LINK; | |
223 | *pos++ = ie_len; | |
0938393f RP |
224 | memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto)); |
225 | pos += 4; | |
c3896d2c LCC |
226 | memcpy(pos, &llid, 2); |
227 | if (include_plid) { | |
228 | pos += 2; | |
229 | memcpy(pos, &plid, 2); | |
230 | } | |
231 | if (action == PLINK_CLOSE) { | |
232 | pos += 2; | |
233 | memcpy(pos, &reason, 2); | |
234 | } | |
235 | ||
62ae67be | 236 | ieee80211_tx_skb(sdata, skb); |
c3896d2c LCC |
237 | return 0; |
238 | } | |
239 | ||
881d948c | 240 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata, |
c3896d2c LCC |
241 | bool peer_accepting_plinks) |
242 | { | |
f698d856 | 243 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
244 | struct sta_info *sta; |
245 | ||
d0709a65 JB |
246 | rcu_read_lock(); |
247 | ||
abe60632 | 248 | sta = sta_info_get(sdata, hw_addr); |
c3896d2c | 249 | if (!sta) { |
34e89507 JB |
250 | rcu_read_unlock(); |
251 | ||
03e4497e | 252 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
34e89507 | 253 | if (!sta) |
73651ee6 | 254 | return; |
34e89507 | 255 | if (sta_info_insert_rcu(sta)) { |
d0709a65 | 256 | rcu_read_unlock(); |
c3896d2c | 257 | return; |
d0709a65 | 258 | } |
c3896d2c LCC |
259 | } |
260 | ||
261 | sta->last_rx = jiffies; | |
323ce79a | 262 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
b4e08ea1 | 263 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
472dbc45 JB |
264 | sdata->u.mesh.accepting_plinks && |
265 | sdata->u.mesh.mshcfg.auto_open_plinks) | |
c3896d2c LCC |
266 | mesh_plink_open(sta); |
267 | ||
d0709a65 | 268 | rcu_read_unlock(); |
c3896d2c LCC |
269 | } |
270 | ||
271 | static void mesh_plink_timer(unsigned long data) | |
272 | { | |
273 | struct sta_info *sta; | |
274 | __le16 llid, plid, reason; | |
c3896d2c | 275 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 276 | |
d0709a65 JB |
277 | /* |
278 | * This STA is valid because sta_info_destroy() will | |
279 | * del_timer_sync() this timer after having made sure | |
280 | * it cannot be readded (by deleting the plink.) | |
281 | */ | |
c3896d2c LCC |
282 | sta = (struct sta_info *) data; |
283 | ||
5bb644a0 JB |
284 | if (sta->sdata->local->quiescing) { |
285 | sta->plink_timer_was_running = true; | |
286 | return; | |
287 | } | |
288 | ||
07346f81 | 289 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
290 | if (sta->ignore_plink_timer) { |
291 | sta->ignore_plink_timer = false; | |
07346f81 | 292 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
293 | return; |
294 | } | |
0c68ae26 JB |
295 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
296 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
297 | reason = 0; |
298 | llid = sta->llid; | |
299 | plid = sta->plid; | |
d0709a65 | 300 | sdata = sta->sdata; |
c3896d2c LCC |
301 | |
302 | switch (sta->plink_state) { | |
b4e08ea1 LCC |
303 | case PLINK_OPN_RCVD: |
304 | case PLINK_OPN_SNT: | |
c3896d2c LCC |
305 | /* retry timer */ |
306 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
307 | u32 rand; | |
0c68ae26 JB |
308 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
309 | sta->sta.addr, sta->plink_retries, | |
310 | sta->plink_timeout); | |
c3896d2c LCC |
311 | get_random_bytes(&rand, sizeof(u32)); |
312 | sta->plink_timeout = sta->plink_timeout + | |
313 | rand % sta->plink_timeout; | |
314 | ++sta->plink_retries; | |
d0709a65 | 315 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 316 | spin_unlock_bh(&sta->lock); |
17741cdc | 317 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
c3896d2c LCC |
318 | 0, 0); |
319 | break; | |
320 | } | |
321 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
322 | /* fall through on else */ | |
b4e08ea1 | 323 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
324 | /* confirm timer */ |
325 | if (!reason) | |
326 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
b4e08ea1 | 327 | sta->plink_state = PLINK_HOLDING; |
d0709a65 | 328 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 329 | spin_unlock_bh(&sta->lock); |
17741cdc | 330 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, |
c3896d2c LCC |
331 | reason); |
332 | break; | |
b4e08ea1 | 333 | case PLINK_HOLDING: |
c3896d2c | 334 | /* holding timer */ |
d0709a65 | 335 | del_timer(&sta->plink_timer); |
c3896d2c | 336 | mesh_plink_fsm_restart(sta); |
07346f81 | 337 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
338 | break; |
339 | default: | |
07346f81 | 340 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
341 | break; |
342 | } | |
c3896d2c LCC |
343 | } |
344 | ||
5bb644a0 JB |
345 | #ifdef CONFIG_PM |
346 | void mesh_plink_quiesce(struct sta_info *sta) | |
347 | { | |
348 | if (del_timer_sync(&sta->plink_timer)) | |
349 | sta->plink_timer_was_running = true; | |
350 | } | |
351 | ||
352 | void mesh_plink_restart(struct sta_info *sta) | |
353 | { | |
354 | if (sta->plink_timer_was_running) { | |
355 | add_timer(&sta->plink_timer); | |
356 | sta->plink_timer_was_running = false; | |
357 | } | |
358 | } | |
359 | #endif | |
360 | ||
c3896d2c LCC |
361 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
362 | { | |
363 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
364 | sta->plink_timer.data = (unsigned long) sta; | |
365 | sta->plink_timer.function = mesh_plink_timer; | |
366 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
367 | add_timer(&sta->plink_timer); |
368 | } | |
369 | ||
370 | int mesh_plink_open(struct sta_info *sta) | |
371 | { | |
372 | __le16 llid; | |
d0709a65 | 373 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 374 | |
07346f81 | 375 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
376 | get_random_bytes(&llid, 2); |
377 | sta->llid = llid; | |
b4e08ea1 | 378 | if (sta->plink_state != PLINK_LISTEN) { |
07346f81 | 379 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
380 | return -EBUSY; |
381 | } | |
b4e08ea1 | 382 | sta->plink_state = PLINK_OPN_SNT; |
c3896d2c | 383 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 384 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
385 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
386 | sta->sta.addr); | |
c3896d2c | 387 | |
f698d856 | 388 | return mesh_plink_frame_tx(sdata, PLINK_OPEN, |
17741cdc | 389 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
390 | } |
391 | ||
392 | void mesh_plink_block(struct sta_info *sta) | |
393 | { | |
c9370197 JL |
394 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
395 | bool deactivated; | |
396 | ||
07346f81 | 397 | spin_lock_bh(&sta->lock); |
c9370197 | 398 | deactivated = __mesh_plink_deactivate(sta); |
b4e08ea1 | 399 | sta->plink_state = PLINK_BLOCKED; |
07346f81 | 400 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
401 | |
402 | if (deactivated) | |
403 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
c3896d2c LCC |
404 | } |
405 | ||
c3896d2c | 406 | |
f698d856 | 407 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
408 | size_t len, struct ieee80211_rx_status *rx_status) |
409 | { | |
d0709a65 | 410 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
411 | struct ieee802_11_elems elems; |
412 | struct sta_info *sta; | |
413 | enum plink_event event; | |
414 | enum plink_frame_type ftype; | |
415 | size_t baselen; | |
d12c7452 | 416 | bool deactivated, matches_local = true; |
c3896d2c LCC |
417 | u8 ie_len; |
418 | u8 *baseaddr; | |
419 | __le16 plid, llid, reason; | |
1460dd15 RP |
420 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
421 | static const char *mplstates[] = { | |
422 | [PLINK_LISTEN] = "LISTEN", | |
423 | [PLINK_OPN_SNT] = "OPN-SNT", | |
424 | [PLINK_OPN_RCVD] = "OPN-RCVD", | |
425 | [PLINK_CNF_RCVD] = "CNF_RCVD", | |
426 | [PLINK_ESTAB] = "ESTAB", | |
427 | [PLINK_HOLDING] = "HOLDING", | |
428 | [PLINK_BLOCKED] = "BLOCKED" | |
429 | }; | |
430 | #endif | |
c3896d2c | 431 | |
9c80d3dc JB |
432 | /* need action_code, aux */ |
433 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
434 | return; | |
435 | ||
c3896d2c LCC |
436 | if (is_multicast_ether_addr(mgmt->da)) { |
437 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
438 | return; | |
439 | } | |
440 | ||
441 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
442 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
443 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
444 | baseaddr += 4; | |
70bdb6b2 | 445 | baselen += 4; |
c3896d2c LCC |
446 | } |
447 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
448 | if (!elems.peer_link) { | |
449 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
450 | return; | |
451 | } | |
452 | ||
0938393f | 453 | ftype = mgmt->u.action.u.plink_action.action_code; |
c3896d2c | 454 | ie_len = elems.peer_link_len; |
0938393f RP |
455 | if ((ftype == PLINK_OPEN && ie_len != 6) || |
456 | (ftype == PLINK_CONFIRM && ie_len != 8) || | |
457 | (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) { | |
458 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", | |
459 | ftype, ie_len); | |
c3896d2c LCC |
460 | return; |
461 | } | |
462 | ||
463 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
464 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
465 | return; | |
466 | } | |
467 | /* Note the lines below are correct, the llid in the frame is the plid | |
468 | * from the point of view of this host. | |
469 | */ | |
470 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
0938393f | 471 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10)) |
c3896d2c LCC |
472 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); |
473 | ||
d0709a65 JB |
474 | rcu_read_lock(); |
475 | ||
abe60632 | 476 | sta = sta_info_get(sdata, mgmt->sa); |
c3896d2c LCC |
477 | if (!sta && ftype != PLINK_OPEN) { |
478 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
d0709a65 | 479 | rcu_read_unlock(); |
c3896d2c LCC |
480 | return; |
481 | } | |
482 | ||
b4e08ea1 | 483 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
d0709a65 | 484 | rcu_read_unlock(); |
c3896d2c LCC |
485 | return; |
486 | } | |
487 | ||
488 | /* Now we will figure out the appropriate event... */ | |
489 | event = PLINK_UNDEFINED; | |
f698d856 | 490 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) { |
d12c7452 | 491 | matches_local = false; |
c3896d2c LCC |
492 | switch (ftype) { |
493 | case PLINK_OPEN: | |
494 | event = OPN_RJCT; | |
495 | break; | |
496 | case PLINK_CONFIRM: | |
497 | event = CNF_RJCT; | |
498 | break; | |
499 | case PLINK_CLOSE: | |
500 | /* avoid warning */ | |
501 | break; | |
502 | } | |
d12c7452 CL |
503 | } |
504 | ||
505 | if (!sta && !matches_local) { | |
506 | rcu_read_unlock(); | |
507 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
508 | llid = 0; | |
509 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, mgmt->sa, llid, | |
510 | plid, reason); | |
511 | return; | |
c3896d2c LCC |
512 | } else if (!sta) { |
513 | /* ftype == PLINK_OPEN */ | |
881d948c | 514 | u32 rates; |
34e89507 JB |
515 | |
516 | rcu_read_unlock(); | |
517 | ||
c3896d2c LCC |
518 | if (!mesh_plink_free_count(sdata)) { |
519 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
520 | return; | |
521 | } | |
522 | ||
523 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
03e4497e | 524 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
73651ee6 | 525 | if (!sta) { |
c3896d2c LCC |
526 | mpl_dbg("Mesh plink error: plink table full\n"); |
527 | return; | |
528 | } | |
34e89507 | 529 | if (sta_info_insert_rcu(sta)) { |
73651ee6 JB |
530 | rcu_read_unlock(); |
531 | return; | |
532 | } | |
c3896d2c | 533 | event = OPN_ACPT; |
07346f81 | 534 | spin_lock_bh(&sta->lock); |
d12c7452 | 535 | } else if (matches_local) { |
07346f81 | 536 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
537 | switch (ftype) { |
538 | case PLINK_OPEN: | |
539 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 540 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
541 | event = OPN_IGNR; |
542 | else | |
543 | event = OPN_ACPT; | |
544 | break; | |
545 | case PLINK_CONFIRM: | |
546 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 547 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
548 | event = CNF_IGNR; |
549 | else | |
550 | event = CNF_ACPT; | |
551 | break; | |
552 | case PLINK_CLOSE: | |
b4e08ea1 | 553 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c LCC |
554 | /* Do not check for llid or plid. This does not |
555 | * follow the standard but since multiple plinks | |
556 | * per sta are not supported, it is necessary in | |
557 | * order to avoid a livelock when MP A sees an | |
558 | * establish peer link to MP B but MP B does not | |
559 | * see it. This can be caused by a timeout in | |
560 | * B's peer link establishment or B beign | |
561 | * restarted. | |
562 | */ | |
563 | event = CLS_ACPT; | |
564 | else if (sta->plid != plid) | |
565 | event = CLS_IGNR; | |
566 | else if (ie_len == 7 && sta->llid != llid) | |
567 | event = CLS_IGNR; | |
568 | else | |
569 | event = CLS_ACPT; | |
570 | break; | |
571 | default: | |
572 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 573 | spin_unlock_bh(&sta->lock); |
d0709a65 | 574 | rcu_read_unlock(); |
c3896d2c LCC |
575 | return; |
576 | } | |
d12c7452 CL |
577 | } else { |
578 | spin_lock_bh(&sta->lock); | |
c3896d2c LCC |
579 | } |
580 | ||
1460dd15 RP |
581 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
582 | mgmt->sa, mplstates[sta->plink_state], | |
0c68ae26 JB |
583 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
584 | event); | |
c3896d2c LCC |
585 | reason = 0; |
586 | switch (sta->plink_state) { | |
587 | /* spin_unlock as soon as state is updated at each case */ | |
b4e08ea1 | 588 | case PLINK_LISTEN: |
c3896d2c LCC |
589 | switch (event) { |
590 | case CLS_ACPT: | |
591 | mesh_plink_fsm_restart(sta); | |
07346f81 | 592 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
593 | break; |
594 | case OPN_ACPT: | |
b4e08ea1 | 595 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
596 | sta->plid = plid; |
597 | get_random_bytes(&llid, 2); | |
598 | sta->llid = llid; | |
599 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 600 | spin_unlock_bh(&sta->lock); |
17741cdc | 601 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
c3896d2c | 602 | 0, 0); |
17741cdc | 603 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, |
c3896d2c LCC |
604 | llid, plid, 0); |
605 | break; | |
606 | default: | |
07346f81 | 607 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
608 | break; |
609 | } | |
610 | break; | |
611 | ||
b4e08ea1 | 612 | case PLINK_OPN_SNT: |
c3896d2c LCC |
613 | switch (event) { |
614 | case OPN_RJCT: | |
615 | case CNF_RJCT: | |
616 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
617 | case CLS_ACPT: | |
618 | if (!reason) | |
619 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
620 | sta->reason = reason; | |
b4e08ea1 | 621 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
622 | if (!mod_plink_timer(sta, |
623 | dot11MeshHoldingTimeout(sdata))) | |
624 | sta->ignore_plink_timer = true; | |
625 | ||
626 | llid = sta->llid; | |
07346f81 | 627 | spin_unlock_bh(&sta->lock); |
17741cdc | 628 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
629 | plid, reason); |
630 | break; | |
631 | case OPN_ACPT: | |
632 | /* retry timer is left untouched */ | |
b4e08ea1 | 633 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
634 | sta->plid = plid; |
635 | llid = sta->llid; | |
07346f81 | 636 | spin_unlock_bh(&sta->lock); |
17741cdc | 637 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
638 | plid, 0); |
639 | break; | |
640 | case CNF_ACPT: | |
b4e08ea1 | 641 | sta->plink_state = PLINK_CNF_RCVD; |
c3896d2c LCC |
642 | if (!mod_plink_timer(sta, |
643 | dot11MeshConfirmTimeout(sdata))) | |
644 | sta->ignore_plink_timer = true; | |
645 | ||
07346f81 | 646 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
647 | break; |
648 | default: | |
07346f81 | 649 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
650 | break; |
651 | } | |
652 | break; | |
653 | ||
b4e08ea1 | 654 | case PLINK_OPN_RCVD: |
c3896d2c LCC |
655 | switch (event) { |
656 | case OPN_RJCT: | |
657 | case CNF_RJCT: | |
658 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
659 | case CLS_ACPT: | |
660 | if (!reason) | |
661 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
662 | sta->reason = reason; | |
b4e08ea1 | 663 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
664 | if (!mod_plink_timer(sta, |
665 | dot11MeshHoldingTimeout(sdata))) | |
666 | sta->ignore_plink_timer = true; | |
667 | ||
668 | llid = sta->llid; | |
07346f81 | 669 | spin_unlock_bh(&sta->lock); |
17741cdc | 670 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
671 | plid, reason); |
672 | break; | |
673 | case OPN_ACPT: | |
674 | llid = sta->llid; | |
07346f81 | 675 | spin_unlock_bh(&sta->lock); |
17741cdc | 676 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
677 | plid, 0); |
678 | break; | |
679 | case CNF_ACPT: | |
d0709a65 | 680 | del_timer(&sta->plink_timer); |
b4e08ea1 | 681 | sta->plink_state = PLINK_ESTAB; |
07346f81 | 682 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
683 | mesh_plink_inc_estab_count(sdata); |
684 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
685 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
686 | sta->sta.addr); | |
c3896d2c LCC |
687 | break; |
688 | default: | |
07346f81 | 689 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
690 | break; |
691 | } | |
692 | break; | |
693 | ||
b4e08ea1 | 694 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
695 | switch (event) { |
696 | case OPN_RJCT: | |
697 | case CNF_RJCT: | |
698 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
699 | case CLS_ACPT: | |
700 | if (!reason) | |
701 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
702 | sta->reason = reason; | |
b4e08ea1 | 703 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
704 | if (!mod_plink_timer(sta, |
705 | dot11MeshHoldingTimeout(sdata))) | |
706 | sta->ignore_plink_timer = true; | |
707 | ||
708 | llid = sta->llid; | |
07346f81 | 709 | spin_unlock_bh(&sta->lock); |
17741cdc | 710 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c | 711 | plid, reason); |
ff59dc76 | 712 | break; |
c3896d2c | 713 | case OPN_ACPT: |
d0709a65 | 714 | del_timer(&sta->plink_timer); |
b4e08ea1 | 715 | sta->plink_state = PLINK_ESTAB; |
07346f81 | 716 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
717 | mesh_plink_inc_estab_count(sdata); |
718 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
719 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
720 | sta->sta.addr); | |
17741cdc | 721 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
722 | plid, 0); |
723 | break; | |
724 | default: | |
07346f81 | 725 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
726 | break; |
727 | } | |
728 | break; | |
729 | ||
b4e08ea1 | 730 | case PLINK_ESTAB: |
c3896d2c LCC |
731 | switch (event) { |
732 | case CLS_ACPT: | |
733 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
734 | sta->reason = reason; | |
c9370197 | 735 | deactivated = __mesh_plink_deactivate(sta); |
b4e08ea1 | 736 | sta->plink_state = PLINK_HOLDING; |
c3896d2c | 737 | llid = sta->llid; |
d0709a65 | 738 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 739 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
740 | if (deactivated) |
741 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
17741cdc | 742 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
743 | plid, reason); |
744 | break; | |
745 | case OPN_ACPT: | |
746 | llid = sta->llid; | |
07346f81 | 747 | spin_unlock_bh(&sta->lock); |
17741cdc | 748 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
749 | plid, 0); |
750 | break; | |
751 | default: | |
07346f81 | 752 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
753 | break; |
754 | } | |
755 | break; | |
b4e08ea1 | 756 | case PLINK_HOLDING: |
c3896d2c LCC |
757 | switch (event) { |
758 | case CLS_ACPT: | |
d0709a65 | 759 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 760 | sta->ignore_plink_timer = 1; |
c3896d2c | 761 | mesh_plink_fsm_restart(sta); |
07346f81 | 762 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
763 | break; |
764 | case OPN_ACPT: | |
765 | case CNF_ACPT: | |
766 | case OPN_RJCT: | |
767 | case CNF_RJCT: | |
768 | llid = sta->llid; | |
769 | reason = sta->reason; | |
07346f81 | 770 | spin_unlock_bh(&sta->lock); |
17741cdc JB |
771 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, |
772 | llid, plid, reason); | |
c3896d2c LCC |
773 | break; |
774 | default: | |
07346f81 | 775 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
776 | } |
777 | break; | |
778 | default: | |
b4e08ea1 | 779 | /* should not get here, PLINK_BLOCKED is dealt with at the |
3ad2f3fb | 780 | * beginning of the function |
c3896d2c | 781 | */ |
07346f81 | 782 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
783 | break; |
784 | } | |
d0709a65 JB |
785 | |
786 | rcu_read_unlock(); | |
c3896d2c | 787 | } |