Commit | Line | Data |
---|---|---|
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 LCC |
11 | #include "ieee80211_i.h" |
12 | #include "ieee80211_rate.h" | |
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 | ||
21 | #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype) | |
22 | #define PLINK_GET_FRAME_SUBTYPE(p) (p) | |
23 | #define PLINK_GET_LLID(p) (p + 1) | |
24 | #define PLINK_GET_PLID(p) (p + 3) | |
25 | ||
26 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
27 | jiffies + HZ * t / 1000)) | |
28 | ||
29 | /* Peer link cancel reasons, all subject to ANA approval */ | |
30 | #define MESH_LINK_CANCELLED 2 | |
31 | #define MESH_MAX_NEIGHBORS 3 | |
32 | #define MESH_CAPABILITY_POLICY_VIOLATION 4 | |
33 | #define MESH_CLOSE_RCVD 5 | |
34 | #define MESH_MAX_RETRIES 6 | |
35 | #define MESH_CONFIRM_TIMEOUT 7 | |
36 | #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS 8 | |
37 | #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9 | |
38 | #define MESH_SECURITY_FAILED_VERIFICATION 10 | |
39 | ||
40 | #define dot11MeshMaxRetries(s) (s->u.sta.mshcfg.dot11MeshMaxRetries) | |
41 | #define dot11MeshRetryTimeout(s) (s->u.sta.mshcfg.dot11MeshRetryTimeout) | |
42 | #define dot11MeshConfirmTimeout(s) (s->u.sta.mshcfg.dot11MeshConfirmTimeout) | |
43 | #define dot11MeshHoldingTimeout(s) (s->u.sta.mshcfg.dot11MeshHoldingTimeout) | |
44 | #define dot11MeshMaxPeerLinks(s) (s->u.sta.mshcfg.dot11MeshMaxPeerLinks) | |
45 | ||
46 | enum plink_frame_type { | |
47 | PLINK_OPEN = 0, | |
48 | PLINK_CONFIRM, | |
49 | PLINK_CLOSE | |
50 | }; | |
51 | ||
52 | enum plink_event { | |
53 | PLINK_UNDEFINED, | |
54 | OPN_ACPT, | |
55 | OPN_RJCT, | |
56 | OPN_IGNR, | |
57 | CNF_ACPT, | |
58 | CNF_RJCT, | |
59 | CNF_IGNR, | |
60 | CLS_ACPT, | |
61 | CLS_IGNR | |
62 | }; | |
63 | ||
64 | static inline | |
65 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
66 | { | |
67 | atomic_inc(&sdata->u.sta.mshstats.estab_plinks); | |
d0709a65 | 68 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
69 | } |
70 | ||
71 | static inline | |
72 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
73 | { | |
74 | atomic_dec(&sdata->u.sta.mshstats.estab_plinks); | |
d0709a65 | 75 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
76 | } |
77 | ||
78 | /** | |
79 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
80 | * | |
81 | * @sta: mes peer link to restart | |
82 | * | |
83 | * Locking: this function must be called holding sta->plink_lock | |
84 | */ | |
85 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
86 | { | |
b4e08ea1 | 87 | sta->plink_state = PLINK_LISTEN; |
37659ff8 LCC |
88 | sta->llid = sta->plid = sta->reason = 0; |
89 | sta->plink_retries = 0; | |
c3896d2c LCC |
90 | } |
91 | ||
03e4497e JB |
92 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
93 | u8 *hw_addr, u64 rates) | |
c3896d2c | 94 | { |
d0709a65 | 95 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
96 | struct sta_info *sta; |
97 | ||
c3896d2c | 98 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 99 | return NULL; |
c3896d2c | 100 | |
03e4497e | 101 | sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC); |
73651ee6 JB |
102 | if (!sta) |
103 | return NULL; | |
c3896d2c | 104 | |
c3896d2c LCC |
105 | sta->flags |= WLAN_STA_AUTHORIZED; |
106 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
c3896d2c LCC |
107 | |
108 | return sta; | |
109 | } | |
110 | ||
111 | /** | |
42096b63 | 112 | * mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
113 | * |
114 | * @sta: mesh peer link to deactivate | |
115 | * | |
116 | * All mesh paths with this peer as next hop will be flushed | |
117 | * | |
118 | * Locking: the caller must hold sta->plink_lock | |
119 | */ | |
902acc78 | 120 | static void __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 121 | { |
d0709a65 JB |
122 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
123 | ||
b4e08ea1 | 124 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c | 125 | mesh_plink_dec_estab_count(sdata); |
b4e08ea1 | 126 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
127 | mesh_path_flush_by_nexthop(sta); |
128 | } | |
129 | ||
902acc78 JB |
130 | /** |
131 | * __mesh_plink_deactivate - deactivate mesh peer link | |
132 | * | |
133 | * @sta: mesh peer link to deactivate | |
134 | * | |
135 | * All mesh paths with this peer as next hop will be flushed | |
136 | */ | |
137 | void mesh_plink_deactivate(struct sta_info *sta) | |
138 | { | |
139 | spin_lock_bh(&sta->plink_lock); | |
140 | __mesh_plink_deactivate(sta); | |
141 | spin_unlock_bh(&sta->plink_lock); | |
142 | } | |
143 | ||
c3896d2c LCC |
144 | static int mesh_plink_frame_tx(struct net_device *dev, |
145 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, | |
146 | __le16 reason) { | |
147 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
148 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); | |
149 | struct ieee80211_mgmt *mgmt; | |
150 | bool include_plid = false; | |
151 | u8 *pos; | |
152 | int ie_len; | |
153 | ||
154 | if (!skb) | |
155 | return -1; | |
156 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
157 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
158 | * common action part (1) | |
159 | */ | |
160 | mgmt = (struct ieee80211_mgmt *) | |
161 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
162 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
163 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
164 | IEEE80211_STYPE_ACTION); | |
165 | memcpy(mgmt->da, da, ETH_ALEN); | |
166 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); | |
167 | /* BSSID is left zeroed, wildcard value */ | |
168 | mgmt->u.action.category = PLINK_CATEGORY; | |
169 | mgmt->u.action.u.plink_action.action_code = action; | |
170 | ||
171 | if (action == PLINK_CLOSE) | |
172 | mgmt->u.action.u.plink_action.aux = reason; | |
173 | else { | |
174 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
175 | if (action == PLINK_CONFIRM) { | |
176 | pos = skb_put(skb, 4); | |
177 | /* two-byte status code followed by two-byte AID */ | |
178 | memset(pos, 0, 4); | |
179 | } | |
180 | mesh_mgmt_ies_add(skb, dev); | |
181 | } | |
182 | ||
183 | /* Add Peer Link Management element */ | |
184 | switch (action) { | |
185 | case PLINK_OPEN: | |
186 | ie_len = 3; | |
187 | break; | |
188 | case PLINK_CONFIRM: | |
189 | ie_len = 5; | |
190 | include_plid = true; | |
191 | break; | |
192 | case PLINK_CLOSE: | |
193 | default: | |
194 | if (!plid) | |
195 | ie_len = 5; | |
196 | else { | |
197 | ie_len = 7; | |
198 | include_plid = true; | |
199 | } | |
200 | break; | |
201 | } | |
202 | ||
203 | pos = skb_put(skb, 2 + ie_len); | |
204 | *pos++ = WLAN_EID_PEER_LINK; | |
205 | *pos++ = ie_len; | |
206 | *pos++ = action; | |
207 | memcpy(pos, &llid, 2); | |
208 | if (include_plid) { | |
209 | pos += 2; | |
210 | memcpy(pos, &plid, 2); | |
211 | } | |
212 | if (action == PLINK_CLOSE) { | |
213 | pos += 2; | |
214 | memcpy(pos, &reason, 2); | |
215 | } | |
216 | ||
217 | ieee80211_sta_tx(dev, skb, 0); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, | |
222 | bool peer_accepting_plinks) | |
223 | { | |
224 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
225 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
226 | struct sta_info *sta; | |
227 | ||
d0709a65 JB |
228 | rcu_read_lock(); |
229 | ||
c3896d2c LCC |
230 | sta = sta_info_get(local, hw_addr); |
231 | if (!sta) { | |
03e4497e | 232 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
73651ee6 JB |
233 | if (!sta) { |
234 | rcu_read_unlock(); | |
235 | return; | |
236 | } | |
237 | if (sta_info_insert(sta)) { | |
238 | sta_info_destroy(sta); | |
d0709a65 | 239 | rcu_read_unlock(); |
c3896d2c | 240 | return; |
d0709a65 | 241 | } |
c3896d2c LCC |
242 | } |
243 | ||
244 | sta->last_rx = jiffies; | |
245 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
b4e08ea1 | 246 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
c3896d2c LCC |
247 | sdata->u.sta.accepting_plinks && |
248 | sdata->u.sta.mshcfg.auto_open_plinks) | |
249 | mesh_plink_open(sta); | |
250 | ||
d0709a65 | 251 | rcu_read_unlock(); |
c3896d2c LCC |
252 | } |
253 | ||
254 | static void mesh_plink_timer(unsigned long data) | |
255 | { | |
256 | struct sta_info *sta; | |
257 | __le16 llid, plid, reason; | |
258 | struct net_device *dev = NULL; | |
259 | struct ieee80211_sub_if_data *sdata; | |
260 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
261 | DECLARE_MAC_BUF(mac); | |
262 | #endif | |
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 | ||
271 | spin_lock_bh(&sta->plink_lock); | |
272 | if (sta->ignore_plink_timer) { | |
273 | sta->ignore_plink_timer = false; | |
274 | spin_unlock_bh(&sta->plink_lock); | |
275 | return; | |
276 | } | |
277 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", | |
278 | print_mac(mac, sta->addr), sta->plink_state); | |
279 | reason = 0; | |
280 | llid = sta->llid; | |
281 | plid = sta->plid; | |
d0709a65 JB |
282 | sdata = sta->sdata; |
283 | dev = sdata->dev; | |
c3896d2c LCC |
284 | |
285 | switch (sta->plink_state) { | |
b4e08ea1 LCC |
286 | case PLINK_OPN_RCVD: |
287 | case PLINK_OPN_SNT: | |
c3896d2c LCC |
288 | /* retry timer */ |
289 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
290 | u32 rand; | |
291 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", | |
292 | print_mac(mac, sta->addr), | |
293 | sta->plink_retries, sta->plink_timeout); | |
294 | get_random_bytes(&rand, sizeof(u32)); | |
295 | sta->plink_timeout = sta->plink_timeout + | |
296 | rand % sta->plink_timeout; | |
297 | ++sta->plink_retries; | |
d0709a65 | 298 | mod_plink_timer(sta, sta->plink_timeout); |
c3896d2c LCC |
299 | spin_unlock_bh(&sta->plink_lock); |
300 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
301 | 0, 0); | |
302 | break; | |
303 | } | |
304 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
305 | /* fall through on else */ | |
b4e08ea1 | 306 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
307 | /* confirm timer */ |
308 | if (!reason) | |
309 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
b4e08ea1 | 310 | sta->plink_state = PLINK_HOLDING; |
d0709a65 | 311 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
312 | spin_unlock_bh(&sta->plink_lock); |
313 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, | |
314 | reason); | |
315 | break; | |
b4e08ea1 | 316 | case PLINK_HOLDING: |
c3896d2c | 317 | /* holding timer */ |
d0709a65 | 318 | del_timer(&sta->plink_timer); |
c3896d2c LCC |
319 | mesh_plink_fsm_restart(sta); |
320 | spin_unlock_bh(&sta->plink_lock); | |
321 | break; | |
322 | default: | |
323 | spin_unlock_bh(&sta->plink_lock); | |
324 | break; | |
325 | } | |
c3896d2c LCC |
326 | } |
327 | ||
328 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) | |
329 | { | |
330 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
331 | sta->plink_timer.data = (unsigned long) sta; | |
332 | sta->plink_timer.function = mesh_plink_timer; | |
333 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
334 | add_timer(&sta->plink_timer); |
335 | } | |
336 | ||
337 | int mesh_plink_open(struct sta_info *sta) | |
338 | { | |
339 | __le16 llid; | |
d0709a65 | 340 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c LCC |
341 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
342 | DECLARE_MAC_BUF(mac); | |
343 | #endif | |
344 | ||
345 | spin_lock_bh(&sta->plink_lock); | |
346 | get_random_bytes(&llid, 2); | |
347 | sta->llid = llid; | |
b4e08ea1 | 348 | if (sta->plink_state != PLINK_LISTEN) { |
c3896d2c | 349 | spin_unlock_bh(&sta->plink_lock); |
c3896d2c LCC |
350 | return -EBUSY; |
351 | } | |
b4e08ea1 | 352 | sta->plink_state = PLINK_OPN_SNT; |
c3896d2c LCC |
353 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
354 | spin_unlock_bh(&sta->plink_lock); | |
355 | mpl_dbg("Mesh plink: starting establishment with %s\n", | |
356 | print_mac(mac, sta->addr)); | |
357 | ||
d0709a65 JB |
358 | return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN, |
359 | sta->addr, llid, 0, 0); | |
c3896d2c LCC |
360 | } |
361 | ||
362 | void mesh_plink_block(struct sta_info *sta) | |
363 | { | |
364 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
365 | DECLARE_MAC_BUF(mac); | |
366 | #endif | |
367 | ||
368 | spin_lock_bh(&sta->plink_lock); | |
902acc78 | 369 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 370 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
371 | spin_unlock_bh(&sta->plink_lock); |
372 | } | |
373 | ||
374 | int mesh_plink_close(struct sta_info *sta) | |
375 | { | |
d0709a65 | 376 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
37659ff8 | 377 | __le16 llid, plid, reason; |
c3896d2c LCC |
378 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
379 | DECLARE_MAC_BUF(mac); | |
380 | #endif | |
381 | ||
382 | mpl_dbg("Mesh plink: closing link with %s\n", | |
383 | print_mac(mac, sta->addr)); | |
384 | spin_lock_bh(&sta->plink_lock); | |
385 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); | |
386 | reason = sta->reason; | |
387 | ||
b4e08ea1 LCC |
388 | if (sta->plink_state == PLINK_LISTEN || |
389 | sta->plink_state == PLINK_BLOCKED) { | |
c3896d2c LCC |
390 | mesh_plink_fsm_restart(sta); |
391 | spin_unlock_bh(&sta->plink_lock); | |
c3896d2c | 392 | return 0; |
b4e08ea1 | 393 | } else if (sta->plink_state == PLINK_ESTAB) { |
902acc78 | 394 | __mesh_plink_deactivate(sta); |
c3896d2c | 395 | /* The timer should not be running */ |
d0709a65 | 396 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
397 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
398 | sta->ignore_plink_timer = true; | |
399 | ||
b4e08ea1 | 400 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
401 | llid = sta->llid; |
402 | plid = sta->plid; | |
403 | spin_unlock_bh(&sta->plink_lock); | |
d0709a65 JB |
404 | mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid, |
405 | plid, reason); | |
c3896d2c LCC |
406 | return 0; |
407 | } | |
408 | ||
409 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, | |
410 | size_t len, struct ieee80211_rx_status *rx_status) | |
411 | { | |
d0709a65 JB |
412 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
413 | struct ieee80211_local *local = sdata->local; | |
c3896d2c LCC |
414 | struct ieee802_11_elems elems; |
415 | struct sta_info *sta; | |
416 | enum plink_event event; | |
417 | enum plink_frame_type ftype; | |
418 | size_t baselen; | |
419 | u8 ie_len; | |
420 | u8 *baseaddr; | |
421 | __le16 plid, llid, reason; | |
422 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
423 | DECLARE_MAC_BUF(mac); | |
424 | #endif | |
c3896d2c LCC |
425 | |
426 | if (is_multicast_ether_addr(mgmt->da)) { | |
427 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
428 | return; | |
429 | } | |
430 | ||
431 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
432 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
433 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
434 | baseaddr += 4; | |
435 | baselen -= 4; | |
436 | } | |
437 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
438 | if (!elems.peer_link) { | |
439 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
440 | return; | |
441 | } | |
442 | ||
443 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); | |
444 | ie_len = elems.peer_link_len; | |
445 | if ((ftype == PLINK_OPEN && ie_len != 3) || | |
446 | (ftype == PLINK_CONFIRM && ie_len != 5) || | |
447 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { | |
448 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); | |
449 | return; | |
450 | } | |
451 | ||
452 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
453 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
454 | return; | |
455 | } | |
456 | /* Note the lines below are correct, the llid in the frame is the plid | |
457 | * from the point of view of this host. | |
458 | */ | |
459 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
460 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) | |
461 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); | |
462 | ||
d0709a65 JB |
463 | rcu_read_lock(); |
464 | ||
c3896d2c LCC |
465 | sta = sta_info_get(local, mgmt->sa); |
466 | if (!sta && ftype != PLINK_OPEN) { | |
467 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
d0709a65 | 468 | rcu_read_unlock(); |
c3896d2c LCC |
469 | return; |
470 | } | |
471 | ||
b4e08ea1 | 472 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
d0709a65 | 473 | rcu_read_unlock(); |
c3896d2c LCC |
474 | return; |
475 | } | |
476 | ||
477 | /* Now we will figure out the appropriate event... */ | |
478 | event = PLINK_UNDEFINED; | |
479 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { | |
480 | switch (ftype) { | |
481 | case PLINK_OPEN: | |
482 | event = OPN_RJCT; | |
483 | break; | |
484 | case PLINK_CONFIRM: | |
485 | event = CNF_RJCT; | |
486 | break; | |
487 | case PLINK_CLOSE: | |
488 | /* avoid warning */ | |
489 | break; | |
490 | } | |
491 | spin_lock_bh(&sta->plink_lock); | |
492 | } else if (!sta) { | |
493 | /* ftype == PLINK_OPEN */ | |
494 | u64 rates; | |
495 | if (!mesh_plink_free_count(sdata)) { | |
496 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
d0709a65 | 497 | rcu_read_unlock(); |
c3896d2c LCC |
498 | return; |
499 | } | |
500 | ||
501 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
03e4497e | 502 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
73651ee6 | 503 | if (!sta) { |
c3896d2c | 504 | mpl_dbg("Mesh plink error: plink table full\n"); |
d0709a65 | 505 | rcu_read_unlock(); |
c3896d2c LCC |
506 | return; |
507 | } | |
73651ee6 JB |
508 | if (sta_info_insert(sta)) { |
509 | sta_info_destroy(sta); | |
510 | rcu_read_unlock(); | |
511 | return; | |
512 | } | |
c3896d2c LCC |
513 | event = OPN_ACPT; |
514 | spin_lock_bh(&sta->plink_lock); | |
515 | } else { | |
516 | spin_lock_bh(&sta->plink_lock); | |
517 | switch (ftype) { | |
518 | case PLINK_OPEN: | |
519 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 520 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
521 | event = OPN_IGNR; |
522 | else | |
523 | event = OPN_ACPT; | |
524 | break; | |
525 | case PLINK_CONFIRM: | |
526 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 527 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
528 | event = CNF_IGNR; |
529 | else | |
530 | event = CNF_ACPT; | |
531 | break; | |
532 | case PLINK_CLOSE: | |
b4e08ea1 | 533 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c LCC |
534 | /* Do not check for llid or plid. This does not |
535 | * follow the standard but since multiple plinks | |
536 | * per sta are not supported, it is necessary in | |
537 | * order to avoid a livelock when MP A sees an | |
538 | * establish peer link to MP B but MP B does not | |
539 | * see it. This can be caused by a timeout in | |
540 | * B's peer link establishment or B beign | |
541 | * restarted. | |
542 | */ | |
543 | event = CLS_ACPT; | |
544 | else if (sta->plid != plid) | |
545 | event = CLS_IGNR; | |
546 | else if (ie_len == 7 && sta->llid != llid) | |
547 | event = CLS_IGNR; | |
548 | else | |
549 | event = CLS_ACPT; | |
550 | break; | |
551 | default: | |
552 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
553 | spin_unlock_bh(&sta->plink_lock); | |
d0709a65 | 554 | rcu_read_unlock(); |
c3896d2c LCC |
555 | return; |
556 | } | |
557 | } | |
558 | ||
559 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", | |
560 | print_mac(mac, mgmt->sa), sta->plink_state, | |
aa2b5928 | 561 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
c3896d2c LCC |
562 | event); |
563 | reason = 0; | |
564 | switch (sta->plink_state) { | |
565 | /* spin_unlock as soon as state is updated at each case */ | |
b4e08ea1 | 566 | case PLINK_LISTEN: |
c3896d2c LCC |
567 | switch (event) { |
568 | case CLS_ACPT: | |
569 | mesh_plink_fsm_restart(sta); | |
570 | spin_unlock_bh(&sta->plink_lock); | |
571 | break; | |
572 | case OPN_ACPT: | |
b4e08ea1 | 573 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
574 | sta->plid = plid; |
575 | get_random_bytes(&llid, 2); | |
576 | sta->llid = llid; | |
577 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
578 | spin_unlock_bh(&sta->plink_lock); | |
579 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, | |
580 | 0, 0); | |
581 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, | |
582 | llid, plid, 0); | |
583 | break; | |
584 | default: | |
585 | spin_unlock_bh(&sta->plink_lock); | |
586 | break; | |
587 | } | |
588 | break; | |
589 | ||
b4e08ea1 | 590 | case PLINK_OPN_SNT: |
c3896d2c LCC |
591 | switch (event) { |
592 | case OPN_RJCT: | |
593 | case CNF_RJCT: | |
594 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
595 | case CLS_ACPT: | |
596 | if (!reason) | |
597 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
598 | sta->reason = reason; | |
b4e08ea1 | 599 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
600 | if (!mod_plink_timer(sta, |
601 | dot11MeshHoldingTimeout(sdata))) | |
602 | sta->ignore_plink_timer = true; | |
603 | ||
604 | llid = sta->llid; | |
605 | spin_unlock_bh(&sta->plink_lock); | |
606 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
607 | plid, reason); | |
608 | break; | |
609 | case OPN_ACPT: | |
610 | /* retry timer is left untouched */ | |
b4e08ea1 | 611 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
612 | sta->plid = plid; |
613 | llid = sta->llid; | |
614 | spin_unlock_bh(&sta->plink_lock); | |
615 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
616 | plid, 0); | |
617 | break; | |
618 | case CNF_ACPT: | |
b4e08ea1 | 619 | sta->plink_state = PLINK_CNF_RCVD; |
c3896d2c LCC |
620 | if (!mod_plink_timer(sta, |
621 | dot11MeshConfirmTimeout(sdata))) | |
622 | sta->ignore_plink_timer = true; | |
623 | ||
624 | spin_unlock_bh(&sta->plink_lock); | |
625 | break; | |
626 | default: | |
627 | spin_unlock_bh(&sta->plink_lock); | |
628 | break; | |
629 | } | |
630 | break; | |
631 | ||
b4e08ea1 | 632 | case PLINK_OPN_RCVD: |
c3896d2c LCC |
633 | switch (event) { |
634 | case OPN_RJCT: | |
635 | case CNF_RJCT: | |
636 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
637 | case CLS_ACPT: | |
638 | if (!reason) | |
639 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
640 | sta->reason = reason; | |
b4e08ea1 | 641 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
642 | if (!mod_plink_timer(sta, |
643 | dot11MeshHoldingTimeout(sdata))) | |
644 | sta->ignore_plink_timer = true; | |
645 | ||
646 | llid = sta->llid; | |
647 | spin_unlock_bh(&sta->plink_lock); | |
648 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
649 | plid, reason); | |
650 | break; | |
651 | case OPN_ACPT: | |
652 | llid = sta->llid; | |
653 | spin_unlock_bh(&sta->plink_lock); | |
654 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
655 | plid, 0); | |
656 | break; | |
657 | case CNF_ACPT: | |
d0709a65 | 658 | del_timer(&sta->plink_timer); |
b4e08ea1 | 659 | sta->plink_state = PLINK_ESTAB; |
c3896d2c LCC |
660 | mesh_plink_inc_estab_count(sdata); |
661 | spin_unlock_bh(&sta->plink_lock); | |
662 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
663 | print_mac(mac, sta->addr)); | |
664 | break; | |
665 | default: | |
666 | spin_unlock_bh(&sta->plink_lock); | |
667 | break; | |
668 | } | |
669 | break; | |
670 | ||
b4e08ea1 | 671 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
672 | switch (event) { |
673 | case OPN_RJCT: | |
674 | case CNF_RJCT: | |
675 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
676 | case CLS_ACPT: | |
677 | if (!reason) | |
678 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
679 | sta->reason = reason; | |
b4e08ea1 | 680 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
681 | if (!mod_plink_timer(sta, |
682 | dot11MeshHoldingTimeout(sdata))) | |
683 | sta->ignore_plink_timer = true; | |
684 | ||
685 | llid = sta->llid; | |
686 | spin_unlock_bh(&sta->plink_lock); | |
687 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
688 | plid, reason); | |
ff59dc76 | 689 | break; |
c3896d2c | 690 | case OPN_ACPT: |
d0709a65 | 691 | del_timer(&sta->plink_timer); |
b4e08ea1 | 692 | sta->plink_state = PLINK_ESTAB; |
c3896d2c LCC |
693 | mesh_plink_inc_estab_count(sdata); |
694 | spin_unlock_bh(&sta->plink_lock); | |
695 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", | |
696 | print_mac(mac, sta->addr)); | |
697 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
698 | plid, 0); | |
699 | break; | |
700 | default: | |
701 | spin_unlock_bh(&sta->plink_lock); | |
702 | break; | |
703 | } | |
704 | break; | |
705 | ||
b4e08ea1 | 706 | case PLINK_ESTAB: |
c3896d2c LCC |
707 | switch (event) { |
708 | case CLS_ACPT: | |
709 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
710 | sta->reason = reason; | |
902acc78 | 711 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 712 | sta->plink_state = PLINK_HOLDING; |
c3896d2c | 713 | llid = sta->llid; |
d0709a65 | 714 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
715 | spin_unlock_bh(&sta->plink_lock); |
716 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
717 | plid, reason); | |
718 | break; | |
719 | case OPN_ACPT: | |
720 | llid = sta->llid; | |
721 | spin_unlock_bh(&sta->plink_lock); | |
722 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, | |
723 | plid, 0); | |
724 | break; | |
725 | default: | |
726 | spin_unlock_bh(&sta->plink_lock); | |
727 | break; | |
728 | } | |
729 | break; | |
b4e08ea1 | 730 | case PLINK_HOLDING: |
c3896d2c LCC |
731 | switch (event) { |
732 | case CLS_ACPT: | |
d0709a65 | 733 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 734 | sta->ignore_plink_timer = 1; |
c3896d2c LCC |
735 | mesh_plink_fsm_restart(sta); |
736 | spin_unlock_bh(&sta->plink_lock); | |
737 | break; | |
738 | case OPN_ACPT: | |
739 | case CNF_ACPT: | |
740 | case OPN_RJCT: | |
741 | case CNF_RJCT: | |
742 | llid = sta->llid; | |
743 | reason = sta->reason; | |
744 | spin_unlock_bh(&sta->plink_lock); | |
745 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, | |
746 | plid, reason); | |
747 | break; | |
748 | default: | |
749 | spin_unlock_bh(&sta->plink_lock); | |
750 | } | |
751 | break; | |
752 | default: | |
b4e08ea1 LCC |
753 | /* should not get here, PLINK_BLOCKED is dealt with at the |
754 | * beggining of the function | |
c3896d2c LCC |
755 | */ |
756 | spin_unlock_bh(&sta->plink_lock); | |
757 | break; | |
758 | } | |
d0709a65 JB |
759 | |
760 | rcu_read_unlock(); | |
c3896d2c | 761 | } |