Commit | Line | Data |
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c3896d2c LCC |
1 | /* |
2 | * Copyright (c) 2008 open80211s Ltd. | |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
902acc78 JB |
9 | #include <linux/kernel.h> |
10 | #include <linux/random.h> | |
c3896d2c | 11 | #include "ieee80211_i.h" |
2c8dccc7 | 12 | #include "rate.h" |
c3896d2c | 13 | #include "mesh.h" |
c3896d2c LCC |
14 | |
15 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
16 | #define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args) | |
17 | #else | |
18 | #define mpl_dbg(fmt, args...) do { (void)(0); } while (0) | |
19 | #endif | |
20 | ||
c3896d2c LCC |
21 | #define PLINK_GET_FRAME_SUBTYPE(p) (p) |
22 | #define PLINK_GET_LLID(p) (p + 1) | |
23 | #define PLINK_GET_PLID(p) (p + 3) | |
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); |
8f2fda95 | 68 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
c3896d2c LCC |
69 | } |
70 | ||
71 | static inline | |
72 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
73 | { | |
472dbc45 | 74 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 75 | mesh_accept_plinks_update(sdata); |
8f2fda95 | 76 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
c3896d2c LCC |
77 | } |
78 | ||
79 | /** | |
80 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
81 | * | |
82 | * @sta: mes peer link to restart | |
83 | * | |
07346f81 | 84 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
85 | */ |
86 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
87 | { | |
b4e08ea1 | 88 | sta->plink_state = PLINK_LISTEN; |
37659ff8 LCC |
89 | sta->llid = sta->plid = sta->reason = 0; |
90 | sta->plink_retries = 0; | |
c3896d2c LCC |
91 | } |
92 | ||
93e5deb1 JB |
93 | /* |
94 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
95 | * on it in the lifecycle management section! | |
96 | */ | |
03e4497e | 97 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
881d948c | 98 | u8 *hw_addr, u32 rates) |
c3896d2c | 99 | { |
d0709a65 | 100 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
101 | struct sta_info *sta; |
102 | ||
c3896d2c | 103 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 104 | return NULL; |
c3896d2c | 105 | |
03e4497e | 106 | sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC); |
73651ee6 JB |
107 | if (!sta) |
108 | return NULL; | |
c3896d2c | 109 | |
07346f81 | 110 | sta->flags = WLAN_STA_AUTHORIZED; |
323ce79a | 111 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
b973c31a | 112 | rate_control_rate_init(sta); |
c3896d2c LCC |
113 | |
114 | return sta; | |
115 | } | |
116 | ||
117 | /** | |
42096b63 | 118 | * mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
119 | * |
120 | * @sta: mesh peer link to deactivate | |
121 | * | |
122 | * All mesh paths with this peer as next hop will be flushed | |
123 | * | |
07346f81 | 124 | * Locking: the caller must hold sta->lock |
c3896d2c | 125 | */ |
902acc78 | 126 | static void __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 127 | { |
d0709a65 JB |
128 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
129 | ||
b4e08ea1 | 130 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c | 131 | mesh_plink_dec_estab_count(sdata); |
b4e08ea1 | 132 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
133 | mesh_path_flush_by_nexthop(sta); |
134 | } | |
135 | ||
902acc78 JB |
136 | /** |
137 | * __mesh_plink_deactivate - deactivate mesh peer link | |
138 | * | |
139 | * @sta: mesh peer link to deactivate | |
140 | * | |
141 | * All mesh paths with this peer as next hop will be flushed | |
142 | */ | |
143 | void mesh_plink_deactivate(struct sta_info *sta) | |
144 | { | |
07346f81 | 145 | spin_lock_bh(&sta->lock); |
902acc78 | 146 | __mesh_plink_deactivate(sta); |
07346f81 | 147 | spin_unlock_bh(&sta->lock); |
902acc78 JB |
148 | } |
149 | ||
f698d856 | 150 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
c3896d2c LCC |
151 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
152 | __le16 reason) { | |
f698d856 | 153 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
154 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
155 | struct ieee80211_mgmt *mgmt; | |
156 | bool include_plid = false; | |
157 | u8 *pos; | |
158 | int ie_len; | |
159 | ||
160 | if (!skb) | |
161 | return -1; | |
162 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
163 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
164 | * common action part (1) | |
165 | */ | |
166 | mgmt = (struct ieee80211_mgmt *) | |
167 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
168 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
e7827a70 HH |
169 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
170 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 171 | memcpy(mgmt->da, da, ETH_ALEN); |
f698d856 | 172 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
c3896d2c LCC |
173 | /* BSSID is left zeroed, wildcard value */ |
174 | mgmt->u.action.category = PLINK_CATEGORY; | |
175 | mgmt->u.action.u.plink_action.action_code = action; | |
176 | ||
177 | if (action == PLINK_CLOSE) | |
178 | mgmt->u.action.u.plink_action.aux = reason; | |
179 | else { | |
180 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
181 | if (action == PLINK_CONFIRM) { | |
182 | pos = skb_put(skb, 4); | |
183 | /* two-byte status code followed by two-byte AID */ | |
184 | memset(pos, 0, 4); | |
185 | } | |
f698d856 | 186 | mesh_mgmt_ies_add(skb, sdata); |
c3896d2c LCC |
187 | } |
188 | ||
189 | /* Add Peer Link Management element */ | |
190 | switch (action) { | |
191 | case PLINK_OPEN: | |
192 | ie_len = 3; | |
193 | break; | |
194 | case PLINK_CONFIRM: | |
195 | ie_len = 5; | |
196 | include_plid = true; | |
197 | break; | |
198 | case PLINK_CLOSE: | |
199 | default: | |
200 | if (!plid) | |
201 | ie_len = 5; | |
202 | else { | |
203 | ie_len = 7; | |
204 | include_plid = true; | |
205 | } | |
206 | break; | |
207 | } | |
208 | ||
209 | pos = skb_put(skb, 2 + ie_len); | |
210 | *pos++ = WLAN_EID_PEER_LINK; | |
211 | *pos++ = ie_len; | |
212 | *pos++ = action; | |
213 | memcpy(pos, &llid, 2); | |
214 | if (include_plid) { | |
215 | pos += 2; | |
216 | memcpy(pos, &plid, 2); | |
217 | } | |
218 | if (action == PLINK_CLOSE) { | |
219 | pos += 2; | |
220 | memcpy(pos, &reason, 2); | |
221 | } | |
222 | ||
1acc97b6 | 223 | ieee80211_tx_skb(sdata, skb, 1); |
c3896d2c LCC |
224 | return 0; |
225 | } | |
226 | ||
881d948c | 227 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata, |
c3896d2c LCC |
228 | bool peer_accepting_plinks) |
229 | { | |
f698d856 | 230 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
231 | struct sta_info *sta; |
232 | ||
d0709a65 JB |
233 | rcu_read_lock(); |
234 | ||
c3896d2c LCC |
235 | sta = sta_info_get(local, hw_addr); |
236 | if (!sta) { | |
03e4497e | 237 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
73651ee6 JB |
238 | if (!sta) { |
239 | rcu_read_unlock(); | |
240 | return; | |
241 | } | |
242 | if (sta_info_insert(sta)) { | |
d0709a65 | 243 | rcu_read_unlock(); |
c3896d2c | 244 | return; |
d0709a65 | 245 | } |
c3896d2c LCC |
246 | } |
247 | ||
248 | sta->last_rx = jiffies; | |
323ce79a | 249 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
b4e08ea1 | 250 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
472dbc45 JB |
251 | sdata->u.mesh.accepting_plinks && |
252 | sdata->u.mesh.mshcfg.auto_open_plinks) | |
c3896d2c LCC |
253 | mesh_plink_open(sta); |
254 | ||
d0709a65 | 255 | rcu_read_unlock(); |
c3896d2c LCC |
256 | } |
257 | ||
258 | static void mesh_plink_timer(unsigned long data) | |
259 | { | |
260 | struct sta_info *sta; | |
261 | __le16 llid, plid, reason; | |
c3896d2c | 262 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 263 | |
d0709a65 JB |
264 | /* |
265 | * This STA is valid because sta_info_destroy() will | |
266 | * del_timer_sync() this timer after having made sure | |
267 | * it cannot be readded (by deleting the plink.) | |
268 | */ | |
c3896d2c LCC |
269 | sta = (struct sta_info *) data; |
270 | ||
5bb644a0 JB |
271 | if (sta->sdata->local->quiescing) { |
272 | sta->plink_timer_was_running = true; | |
273 | return; | |
274 | } | |
275 | ||
07346f81 | 276 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
277 | if (sta->ignore_plink_timer) { |
278 | sta->ignore_plink_timer = false; | |
07346f81 | 279 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
280 | return; |
281 | } | |
0c68ae26 JB |
282 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
283 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
284 | reason = 0; |
285 | llid = sta->llid; | |
286 | plid = sta->plid; | |
d0709a65 | 287 | sdata = sta->sdata; |
c3896d2c LCC |
288 | |
289 | switch (sta->plink_state) { | |
b4e08ea1 LCC |
290 | case PLINK_OPN_RCVD: |
291 | case PLINK_OPN_SNT: | |
c3896d2c LCC |
292 | /* retry timer */ |
293 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
294 | u32 rand; | |
0c68ae26 JB |
295 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
296 | sta->sta.addr, sta->plink_retries, | |
297 | sta->plink_timeout); | |
c3896d2c LCC |
298 | get_random_bytes(&rand, sizeof(u32)); |
299 | sta->plink_timeout = sta->plink_timeout + | |
300 | rand % sta->plink_timeout; | |
301 | ++sta->plink_retries; | |
d0709a65 | 302 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 303 | spin_unlock_bh(&sta->lock); |
17741cdc | 304 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
c3896d2c LCC |
305 | 0, 0); |
306 | break; | |
307 | } | |
308 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
309 | /* fall through on else */ | |
b4e08ea1 | 310 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
311 | /* confirm timer */ |
312 | if (!reason) | |
313 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
b4e08ea1 | 314 | sta->plink_state = PLINK_HOLDING; |
d0709a65 | 315 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 316 | spin_unlock_bh(&sta->lock); |
17741cdc | 317 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, |
c3896d2c LCC |
318 | reason); |
319 | break; | |
b4e08ea1 | 320 | case PLINK_HOLDING: |
c3896d2c | 321 | /* holding timer */ |
d0709a65 | 322 | del_timer(&sta->plink_timer); |
c3896d2c | 323 | mesh_plink_fsm_restart(sta); |
07346f81 | 324 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
325 | break; |
326 | default: | |
07346f81 | 327 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
328 | break; |
329 | } | |
c3896d2c LCC |
330 | } |
331 | ||
5bb644a0 JB |
332 | #ifdef CONFIG_PM |
333 | void mesh_plink_quiesce(struct sta_info *sta) | |
334 | { | |
335 | if (del_timer_sync(&sta->plink_timer)) | |
336 | sta->plink_timer_was_running = true; | |
337 | } | |
338 | ||
339 | void mesh_plink_restart(struct sta_info *sta) | |
340 | { | |
341 | if (sta->plink_timer_was_running) { | |
342 | add_timer(&sta->plink_timer); | |
343 | sta->plink_timer_was_running = false; | |
344 | } | |
345 | } | |
346 | #endif | |
347 | ||
c3896d2c LCC |
348 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
349 | { | |
350 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
351 | sta->plink_timer.data = (unsigned long) sta; | |
352 | sta->plink_timer.function = mesh_plink_timer; | |
353 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
354 | add_timer(&sta->plink_timer); |
355 | } | |
356 | ||
357 | int mesh_plink_open(struct sta_info *sta) | |
358 | { | |
359 | __le16 llid; | |
d0709a65 | 360 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 361 | |
07346f81 | 362 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
363 | get_random_bytes(&llid, 2); |
364 | sta->llid = llid; | |
b4e08ea1 | 365 | if (sta->plink_state != PLINK_LISTEN) { |
07346f81 | 366 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
367 | return -EBUSY; |
368 | } | |
b4e08ea1 | 369 | sta->plink_state = PLINK_OPN_SNT; |
c3896d2c | 370 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 371 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
372 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
373 | sta->sta.addr); | |
c3896d2c | 374 | |
f698d856 | 375 | return mesh_plink_frame_tx(sdata, PLINK_OPEN, |
17741cdc | 376 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
377 | } |
378 | ||
379 | void mesh_plink_block(struct sta_info *sta) | |
380 | { | |
07346f81 | 381 | spin_lock_bh(&sta->lock); |
902acc78 | 382 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 383 | sta->plink_state = PLINK_BLOCKED; |
07346f81 | 384 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
385 | } |
386 | ||
c3896d2c | 387 | |
f698d856 | 388 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
389 | size_t len, struct ieee80211_rx_status *rx_status) |
390 | { | |
d0709a65 | 391 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
392 | struct ieee802_11_elems elems; |
393 | struct sta_info *sta; | |
394 | enum plink_event event; | |
395 | enum plink_frame_type ftype; | |
396 | size_t baselen; | |
397 | u8 ie_len; | |
398 | u8 *baseaddr; | |
399 | __le16 plid, llid, reason; | |
c3896d2c | 400 | |
9c80d3dc JB |
401 | /* need action_code, aux */ |
402 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
403 | return; | |
404 | ||
c3896d2c LCC |
405 | if (is_multicast_ether_addr(mgmt->da)) { |
406 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
407 | return; | |
408 | } | |
409 | ||
410 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
411 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
412 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
413 | baseaddr += 4; | |
70bdb6b2 | 414 | baselen += 4; |
c3896d2c LCC |
415 | } |
416 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
417 | if (!elems.peer_link) { | |
418 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
419 | return; | |
420 | } | |
421 | ||
422 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); | |
423 | ie_len = elems.peer_link_len; | |
424 | if ((ftype == PLINK_OPEN && ie_len != 3) || | |
425 | (ftype == PLINK_CONFIRM && ie_len != 5) || | |
426 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { | |
427 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); | |
428 | return; | |
429 | } | |
430 | ||
431 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
432 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
433 | return; | |
434 | } | |
435 | /* Note the lines below are correct, the llid in the frame is the plid | |
436 | * from the point of view of this host. | |
437 | */ | |
438 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
439 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) | |
440 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); | |
441 | ||
d0709a65 JB |
442 | rcu_read_lock(); |
443 | ||
c3896d2c LCC |
444 | sta = sta_info_get(local, mgmt->sa); |
445 | if (!sta && ftype != PLINK_OPEN) { | |
446 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
d0709a65 | 447 | rcu_read_unlock(); |
c3896d2c LCC |
448 | return; |
449 | } | |
450 | ||
b4e08ea1 | 451 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
d0709a65 | 452 | rcu_read_unlock(); |
c3896d2c LCC |
453 | return; |
454 | } | |
455 | ||
456 | /* Now we will figure out the appropriate event... */ | |
457 | event = PLINK_UNDEFINED; | |
f698d856 | 458 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) { |
c3896d2c LCC |
459 | switch (ftype) { |
460 | case PLINK_OPEN: | |
461 | event = OPN_RJCT; | |
462 | break; | |
463 | case PLINK_CONFIRM: | |
464 | event = CNF_RJCT; | |
465 | break; | |
466 | case PLINK_CLOSE: | |
467 | /* avoid warning */ | |
468 | break; | |
469 | } | |
07346f81 | 470 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
471 | } else if (!sta) { |
472 | /* ftype == PLINK_OPEN */ | |
881d948c | 473 | u32 rates; |
c3896d2c LCC |
474 | if (!mesh_plink_free_count(sdata)) { |
475 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
d0709a65 | 476 | rcu_read_unlock(); |
c3896d2c LCC |
477 | return; |
478 | } | |
479 | ||
480 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
03e4497e | 481 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
73651ee6 | 482 | if (!sta) { |
c3896d2c | 483 | mpl_dbg("Mesh plink error: plink table full\n"); |
d0709a65 | 484 | rcu_read_unlock(); |
c3896d2c LCC |
485 | return; |
486 | } | |
73651ee6 | 487 | if (sta_info_insert(sta)) { |
73651ee6 JB |
488 | rcu_read_unlock(); |
489 | return; | |
490 | } | |
c3896d2c | 491 | event = OPN_ACPT; |
07346f81 | 492 | spin_lock_bh(&sta->lock); |
c3896d2c | 493 | } else { |
07346f81 | 494 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
495 | switch (ftype) { |
496 | case PLINK_OPEN: | |
497 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 498 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
499 | event = OPN_IGNR; |
500 | else | |
501 | event = OPN_ACPT; | |
502 | break; | |
503 | case PLINK_CONFIRM: | |
504 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 505 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
506 | event = CNF_IGNR; |
507 | else | |
508 | event = CNF_ACPT; | |
509 | break; | |
510 | case PLINK_CLOSE: | |
b4e08ea1 | 511 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c LCC |
512 | /* Do not check for llid or plid. This does not |
513 | * follow the standard but since multiple plinks | |
514 | * per sta are not supported, it is necessary in | |
515 | * order to avoid a livelock when MP A sees an | |
516 | * establish peer link to MP B but MP B does not | |
517 | * see it. This can be caused by a timeout in | |
518 | * B's peer link establishment or B beign | |
519 | * restarted. | |
520 | */ | |
521 | event = CLS_ACPT; | |
522 | else if (sta->plid != plid) | |
523 | event = CLS_IGNR; | |
524 | else if (ie_len == 7 && sta->llid != llid) | |
525 | event = CLS_IGNR; | |
526 | else | |
527 | event = CLS_ACPT; | |
528 | break; | |
529 | default: | |
530 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 531 | spin_unlock_bh(&sta->lock); |
d0709a65 | 532 | rcu_read_unlock(); |
c3896d2c LCC |
533 | return; |
534 | } | |
535 | } | |
536 | ||
0c68ae26 JB |
537 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %d %d %d %d\n", |
538 | mgmt->sa, sta->plink_state, | |
539 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), | |
540 | event); | |
c3896d2c LCC |
541 | reason = 0; |
542 | switch (sta->plink_state) { | |
543 | /* spin_unlock as soon as state is updated at each case */ | |
b4e08ea1 | 544 | case PLINK_LISTEN: |
c3896d2c LCC |
545 | switch (event) { |
546 | case CLS_ACPT: | |
547 | mesh_plink_fsm_restart(sta); | |
07346f81 | 548 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
549 | break; |
550 | case OPN_ACPT: | |
b4e08ea1 | 551 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
552 | sta->plid = plid; |
553 | get_random_bytes(&llid, 2); | |
554 | sta->llid = llid; | |
555 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 556 | spin_unlock_bh(&sta->lock); |
17741cdc | 557 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, |
c3896d2c | 558 | 0, 0); |
17741cdc | 559 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, |
c3896d2c LCC |
560 | llid, plid, 0); |
561 | break; | |
562 | default: | |
07346f81 | 563 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
564 | break; |
565 | } | |
566 | break; | |
567 | ||
b4e08ea1 | 568 | case PLINK_OPN_SNT: |
c3896d2c LCC |
569 | switch (event) { |
570 | case OPN_RJCT: | |
571 | case CNF_RJCT: | |
572 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
573 | case CLS_ACPT: | |
574 | if (!reason) | |
575 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
576 | sta->reason = reason; | |
b4e08ea1 | 577 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
578 | if (!mod_plink_timer(sta, |
579 | dot11MeshHoldingTimeout(sdata))) | |
580 | sta->ignore_plink_timer = true; | |
581 | ||
582 | llid = sta->llid; | |
07346f81 | 583 | spin_unlock_bh(&sta->lock); |
17741cdc | 584 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
585 | plid, reason); |
586 | break; | |
587 | case OPN_ACPT: | |
588 | /* retry timer is left untouched */ | |
b4e08ea1 | 589 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
590 | sta->plid = plid; |
591 | llid = sta->llid; | |
07346f81 | 592 | spin_unlock_bh(&sta->lock); |
17741cdc | 593 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
594 | plid, 0); |
595 | break; | |
596 | case CNF_ACPT: | |
b4e08ea1 | 597 | sta->plink_state = PLINK_CNF_RCVD; |
c3896d2c LCC |
598 | if (!mod_plink_timer(sta, |
599 | dot11MeshConfirmTimeout(sdata))) | |
600 | sta->ignore_plink_timer = true; | |
601 | ||
07346f81 | 602 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
603 | break; |
604 | default: | |
07346f81 | 605 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
606 | break; |
607 | } | |
608 | break; | |
609 | ||
b4e08ea1 | 610 | case PLINK_OPN_RCVD: |
c3896d2c LCC |
611 | switch (event) { |
612 | case OPN_RJCT: | |
613 | case CNF_RJCT: | |
614 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
615 | case CLS_ACPT: | |
616 | if (!reason) | |
617 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
618 | sta->reason = reason; | |
b4e08ea1 | 619 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
620 | if (!mod_plink_timer(sta, |
621 | dot11MeshHoldingTimeout(sdata))) | |
622 | sta->ignore_plink_timer = true; | |
623 | ||
624 | llid = sta->llid; | |
07346f81 | 625 | spin_unlock_bh(&sta->lock); |
17741cdc | 626 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
627 | plid, reason); |
628 | break; | |
629 | case OPN_ACPT: | |
630 | llid = sta->llid; | |
07346f81 | 631 | spin_unlock_bh(&sta->lock); |
17741cdc | 632 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
633 | plid, 0); |
634 | break; | |
635 | case CNF_ACPT: | |
d0709a65 | 636 | del_timer(&sta->plink_timer); |
b4e08ea1 | 637 | sta->plink_state = PLINK_ESTAB; |
c3896d2c | 638 | mesh_plink_inc_estab_count(sdata); |
07346f81 | 639 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
640 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
641 | sta->sta.addr); | |
c3896d2c LCC |
642 | break; |
643 | default: | |
07346f81 | 644 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
645 | break; |
646 | } | |
647 | break; | |
648 | ||
b4e08ea1 | 649 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
650 | switch (event) { |
651 | case OPN_RJCT: | |
652 | case CNF_RJCT: | |
653 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
654 | case CLS_ACPT: | |
655 | if (!reason) | |
656 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
657 | sta->reason = reason; | |
b4e08ea1 | 658 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
659 | if (!mod_plink_timer(sta, |
660 | dot11MeshHoldingTimeout(sdata))) | |
661 | sta->ignore_plink_timer = true; | |
662 | ||
663 | llid = sta->llid; | |
07346f81 | 664 | spin_unlock_bh(&sta->lock); |
17741cdc | 665 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c | 666 | plid, reason); |
ff59dc76 | 667 | break; |
c3896d2c | 668 | case OPN_ACPT: |
d0709a65 | 669 | del_timer(&sta->plink_timer); |
b4e08ea1 | 670 | sta->plink_state = PLINK_ESTAB; |
c3896d2c | 671 | mesh_plink_inc_estab_count(sdata); |
07346f81 | 672 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
673 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
674 | sta->sta.addr); | |
17741cdc | 675 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
676 | plid, 0); |
677 | break; | |
678 | default: | |
07346f81 | 679 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
680 | break; |
681 | } | |
682 | break; | |
683 | ||
b4e08ea1 | 684 | case PLINK_ESTAB: |
c3896d2c LCC |
685 | switch (event) { |
686 | case CLS_ACPT: | |
687 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
688 | sta->reason = reason; | |
902acc78 | 689 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 690 | sta->plink_state = PLINK_HOLDING; |
c3896d2c | 691 | llid = sta->llid; |
d0709a65 | 692 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 693 | spin_unlock_bh(&sta->lock); |
17741cdc | 694 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, |
c3896d2c LCC |
695 | plid, reason); |
696 | break; | |
697 | case OPN_ACPT: | |
698 | llid = sta->llid; | |
07346f81 | 699 | spin_unlock_bh(&sta->lock); |
17741cdc | 700 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, |
c3896d2c LCC |
701 | plid, 0); |
702 | break; | |
703 | default: | |
07346f81 | 704 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
705 | break; |
706 | } | |
707 | break; | |
b4e08ea1 | 708 | case PLINK_HOLDING: |
c3896d2c LCC |
709 | switch (event) { |
710 | case CLS_ACPT: | |
d0709a65 | 711 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 712 | sta->ignore_plink_timer = 1; |
c3896d2c | 713 | mesh_plink_fsm_restart(sta); |
07346f81 | 714 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
715 | break; |
716 | case OPN_ACPT: | |
717 | case CNF_ACPT: | |
718 | case OPN_RJCT: | |
719 | case CNF_RJCT: | |
720 | llid = sta->llid; | |
721 | reason = sta->reason; | |
07346f81 | 722 | spin_unlock_bh(&sta->lock); |
17741cdc JB |
723 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, |
724 | llid, plid, reason); | |
c3896d2c LCC |
725 | break; |
726 | default: | |
07346f81 | 727 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
728 | } |
729 | break; | |
730 | default: | |
b4e08ea1 LCC |
731 | /* should not get here, PLINK_BLOCKED is dealt with at the |
732 | * beggining of the function | |
c3896d2c | 733 | */ |
07346f81 | 734 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
735 | break; |
736 | } | |
d0709a65 JB |
737 | |
738 | rcu_read_unlock(); | |
c3896d2c | 739 | } |