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