]>
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 | 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 | ||
39 | #define dot11MeshMaxRetries(s) (s->u.sta.mshcfg.dot11MeshMaxRetries) | |
40 | #define dot11MeshRetryTimeout(s) (s->u.sta.mshcfg.dot11MeshRetryTimeout) | |
41 | #define dot11MeshConfirmTimeout(s) (s->u.sta.mshcfg.dot11MeshConfirmTimeout) | |
42 | #define dot11MeshHoldingTimeout(s) (s->u.sta.mshcfg.dot11MeshHoldingTimeout) | |
43 | #define dot11MeshMaxPeerLinks(s) (s->u.sta.mshcfg.dot11MeshMaxPeerLinks) | |
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 | { | |
66 | atomic_inc(&sdata->u.sta.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 | { | |
73 | atomic_dec(&sdata->u.sta.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 | * | |
80 | * @sta: mes peer link to restart | |
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 JB |
95 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
96 | u8 *hw_addr, u64 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 | |
03e4497e | 104 | sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC); |
73651ee6 JB |
105 | if (!sta) |
106 | return NULL; | |
c3896d2c | 107 | |
07346f81 | 108 | sta->flags = WLAN_STA_AUTHORIZED; |
c3896d2c | 109 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
c3896d2c LCC |
110 | |
111 | return sta; | |
112 | } | |
113 | ||
114 | /** | |
42096b63 | 115 | * mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
116 | * |
117 | * @sta: mesh peer link to deactivate | |
118 | * | |
119 | * All mesh paths with this peer as next hop will be flushed | |
120 | * | |
07346f81 | 121 | * Locking: the caller must hold sta->lock |
c3896d2c | 122 | */ |
902acc78 | 123 | static void __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 124 | { |
d0709a65 JB |
125 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
126 | ||
b4e08ea1 | 127 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c | 128 | mesh_plink_dec_estab_count(sdata); |
b4e08ea1 | 129 | sta->plink_state = PLINK_BLOCKED; |
c3896d2c LCC |
130 | mesh_path_flush_by_nexthop(sta); |
131 | } | |
132 | ||
902acc78 JB |
133 | /** |
134 | * __mesh_plink_deactivate - deactivate mesh peer link | |
135 | * | |
136 | * @sta: mesh peer link to deactivate | |
137 | * | |
138 | * All mesh paths with this peer as next hop will be flushed | |
139 | */ | |
140 | void mesh_plink_deactivate(struct sta_info *sta) | |
141 | { | |
07346f81 | 142 | spin_lock_bh(&sta->lock); |
902acc78 | 143 | __mesh_plink_deactivate(sta); |
07346f81 | 144 | spin_unlock_bh(&sta->lock); |
902acc78 JB |
145 | } |
146 | ||
f698d856 | 147 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
c3896d2c LCC |
148 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
149 | __le16 reason) { | |
f698d856 | 150 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
151 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
152 | struct ieee80211_mgmt *mgmt; | |
153 | bool include_plid = false; | |
154 | u8 *pos; | |
155 | int ie_len; | |
156 | ||
157 | if (!skb) | |
158 | return -1; | |
159 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
160 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
161 | * common action part (1) | |
162 | */ | |
163 | mgmt = (struct ieee80211_mgmt *) | |
164 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
165 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); | |
e7827a70 HH |
166 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
167 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 168 | memcpy(mgmt->da, da, ETH_ALEN); |
f698d856 | 169 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
c3896d2c LCC |
170 | /* BSSID is left zeroed, wildcard value */ |
171 | mgmt->u.action.category = PLINK_CATEGORY; | |
172 | mgmt->u.action.u.plink_action.action_code = action; | |
173 | ||
174 | if (action == PLINK_CLOSE) | |
175 | mgmt->u.action.u.plink_action.aux = reason; | |
176 | else { | |
177 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); | |
178 | if (action == PLINK_CONFIRM) { | |
179 | pos = skb_put(skb, 4); | |
180 | /* two-byte status code followed by two-byte AID */ | |
181 | memset(pos, 0, 4); | |
182 | } | |
f698d856 | 183 | mesh_mgmt_ies_add(skb, sdata); |
c3896d2c LCC |
184 | } |
185 | ||
186 | /* Add Peer Link Management element */ | |
187 | switch (action) { | |
188 | case PLINK_OPEN: | |
189 | ie_len = 3; | |
190 | break; | |
191 | case PLINK_CONFIRM: | |
192 | ie_len = 5; | |
193 | include_plid = true; | |
194 | break; | |
195 | case PLINK_CLOSE: | |
196 | default: | |
197 | if (!plid) | |
198 | ie_len = 5; | |
199 | else { | |
200 | ie_len = 7; | |
201 | include_plid = true; | |
202 | } | |
203 | break; | |
204 | } | |
205 | ||
206 | pos = skb_put(skb, 2 + ie_len); | |
207 | *pos++ = WLAN_EID_PEER_LINK; | |
208 | *pos++ = ie_len; | |
209 | *pos++ = action; | |
210 | memcpy(pos, &llid, 2); | |
211 | if (include_plid) { | |
212 | pos += 2; | |
213 | memcpy(pos, &plid, 2); | |
214 | } | |
215 | if (action == PLINK_CLOSE) { | |
216 | pos += 2; | |
217 | memcpy(pos, &reason, 2); | |
218 | } | |
219 | ||
e50db65c | 220 | ieee80211_tx_skb(sdata, skb, 0); |
c3896d2c LCC |
221 | return 0; |
222 | } | |
223 | ||
f698d856 | 224 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct ieee80211_sub_if_data *sdata, |
c3896d2c LCC |
225 | bool peer_accepting_plinks) |
226 | { | |
f698d856 | 227 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
228 | struct sta_info *sta; |
229 | ||
d0709a65 JB |
230 | rcu_read_lock(); |
231 | ||
c3896d2c LCC |
232 | sta = sta_info_get(local, hw_addr); |
233 | if (!sta) { | |
03e4497e | 234 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
73651ee6 JB |
235 | if (!sta) { |
236 | rcu_read_unlock(); | |
237 | return; | |
238 | } | |
239 | if (sta_info_insert(sta)) { | |
d0709a65 | 240 | rcu_read_unlock(); |
c3896d2c | 241 | return; |
d0709a65 | 242 | } |
c3896d2c LCC |
243 | } |
244 | ||
245 | sta->last_rx = jiffies; | |
246 | sta->supp_rates[local->hw.conf.channel->band] = rates; | |
b4e08ea1 | 247 | if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN && |
c3896d2c LCC |
248 | sdata->u.sta.accepting_plinks && |
249 | sdata->u.sta.mshcfg.auto_open_plinks) | |
250 | mesh_plink_open(sta); | |
251 | ||
d0709a65 | 252 | rcu_read_unlock(); |
c3896d2c LCC |
253 | } |
254 | ||
255 | static void mesh_plink_timer(unsigned long data) | |
256 | { | |
257 | struct sta_info *sta; | |
258 | __le16 llid, plid, reason; | |
c3896d2c LCC |
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 | ||
07346f81 | 271 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
272 | if (sta->ignore_plink_timer) { |
273 | sta->ignore_plink_timer = false; | |
07346f81 | 274 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
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 | 282 | sdata = sta->sdata; |
c3896d2c LCC |
283 | |
284 | switch (sta->plink_state) { | |
b4e08ea1 LCC |
285 | case PLINK_OPN_RCVD: |
286 | case PLINK_OPN_SNT: | |
c3896d2c LCC |
287 | /* retry timer */ |
288 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
289 | u32 rand; | |
290 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", | |
291 | print_mac(mac, sta->addr), | |
292 | sta->plink_retries, sta->plink_timeout); | |
293 | get_random_bytes(&rand, sizeof(u32)); | |
294 | sta->plink_timeout = sta->plink_timeout + | |
295 | rand % sta->plink_timeout; | |
296 | ++sta->plink_retries; | |
d0709a65 | 297 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 298 | spin_unlock_bh(&sta->lock); |
f698d856 | 299 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->addr, llid, |
c3896d2c LCC |
300 | 0, 0); |
301 | break; | |
302 | } | |
303 | reason = cpu_to_le16(MESH_MAX_RETRIES); | |
304 | /* fall through on else */ | |
b4e08ea1 | 305 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
306 | /* confirm timer */ |
307 | if (!reason) | |
308 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); | |
b4e08ea1 | 309 | sta->plink_state = PLINK_HOLDING; |
d0709a65 | 310 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 311 | spin_unlock_bh(&sta->lock); |
f698d856 | 312 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, plid, |
c3896d2c LCC |
313 | reason); |
314 | break; | |
b4e08ea1 | 315 | case PLINK_HOLDING: |
c3896d2c | 316 | /* holding timer */ |
d0709a65 | 317 | del_timer(&sta->plink_timer); |
c3896d2c | 318 | mesh_plink_fsm_restart(sta); |
07346f81 | 319 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
320 | break; |
321 | default: | |
07346f81 | 322 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
323 | break; |
324 | } | |
c3896d2c LCC |
325 | } |
326 | ||
327 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) | |
328 | { | |
329 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
330 | sta->plink_timer.data = (unsigned long) sta; | |
331 | sta->plink_timer.function = mesh_plink_timer; | |
332 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
333 | add_timer(&sta->plink_timer); |
334 | } | |
335 | ||
336 | int mesh_plink_open(struct sta_info *sta) | |
337 | { | |
338 | __le16 llid; | |
d0709a65 | 339 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c LCC |
340 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
341 | DECLARE_MAC_BUF(mac); | |
342 | #endif | |
343 | ||
07346f81 | 344 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
345 | get_random_bytes(&llid, 2); |
346 | sta->llid = llid; | |
b4e08ea1 | 347 | if (sta->plink_state != PLINK_LISTEN) { |
07346f81 | 348 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
349 | return -EBUSY; |
350 | } | |
b4e08ea1 | 351 | sta->plink_state = PLINK_OPN_SNT; |
c3896d2c | 352 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 353 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
354 | mpl_dbg("Mesh plink: starting establishment with %s\n", |
355 | print_mac(mac, sta->addr)); | |
356 | ||
f698d856 | 357 | return mesh_plink_frame_tx(sdata, PLINK_OPEN, |
d0709a65 | 358 | sta->addr, llid, 0, 0); |
c3896d2c LCC |
359 | } |
360 | ||
361 | void mesh_plink_block(struct sta_info *sta) | |
362 | { | |
363 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
364 | DECLARE_MAC_BUF(mac); | |
365 | #endif | |
366 | ||
07346f81 | 367 | spin_lock_bh(&sta->lock); |
902acc78 | 368 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 369 | sta->plink_state = PLINK_BLOCKED; |
07346f81 | 370 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
371 | } |
372 | ||
373 | int mesh_plink_close(struct sta_info *sta) | |
374 | { | |
d0709a65 | 375 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
37659ff8 | 376 | __le16 llid, plid, reason; |
c3896d2c LCC |
377 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
378 | DECLARE_MAC_BUF(mac); | |
379 | #endif | |
380 | ||
381 | mpl_dbg("Mesh plink: closing link with %s\n", | |
382 | print_mac(mac, sta->addr)); | |
07346f81 | 383 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
384 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); |
385 | reason = sta->reason; | |
386 | ||
b4e08ea1 LCC |
387 | if (sta->plink_state == PLINK_LISTEN || |
388 | sta->plink_state == PLINK_BLOCKED) { | |
c3896d2c | 389 | mesh_plink_fsm_restart(sta); |
07346f81 | 390 | spin_unlock_bh(&sta->lock); |
c3896d2c | 391 | return 0; |
b4e08ea1 | 392 | } else if (sta->plink_state == PLINK_ESTAB) { |
902acc78 | 393 | __mesh_plink_deactivate(sta); |
c3896d2c | 394 | /* The timer should not be running */ |
d0709a65 | 395 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
c3896d2c LCC |
396 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
397 | sta->ignore_plink_timer = true; | |
398 | ||
b4e08ea1 | 399 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
400 | llid = sta->llid; |
401 | plid = sta->plid; | |
07346f81 | 402 | spin_unlock_bh(&sta->lock); |
f698d856 | 403 | mesh_plink_frame_tx(sta->sdata, PLINK_CLOSE, sta->addr, llid, |
d0709a65 | 404 | plid, reason); |
c3896d2c LCC |
405 | return 0; |
406 | } | |
407 | ||
f698d856 | 408 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
409 | size_t len, struct ieee80211_rx_status *rx_status) |
410 | { | |
d0709a65 | 411 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
412 | struct ieee802_11_elems elems; |
413 | struct sta_info *sta; | |
414 | enum plink_event event; | |
415 | enum plink_frame_type ftype; | |
416 | size_t baselen; | |
417 | u8 ie_len; | |
418 | u8 *baseaddr; | |
419 | __le16 plid, llid, reason; | |
420 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG | |
421 | DECLARE_MAC_BUF(mac); | |
422 | #endif | |
c3896d2c | 423 | |
9c80d3dc JB |
424 | /* need action_code, aux */ |
425 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
426 | return; | |
427 | ||
c3896d2c LCC |
428 | if (is_multicast_ether_addr(mgmt->da)) { |
429 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
430 | return; | |
431 | } | |
432 | ||
433 | baseaddr = mgmt->u.action.u.plink_action.variable; | |
434 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; | |
435 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { | |
436 | baseaddr += 4; | |
437 | baselen -= 4; | |
438 | } | |
439 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
440 | if (!elems.peer_link) { | |
441 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); | |
442 | return; | |
443 | } | |
444 | ||
445 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); | |
446 | ie_len = elems.peer_link_len; | |
447 | if ((ftype == PLINK_OPEN && ie_len != 3) || | |
448 | (ftype == PLINK_CONFIRM && ie_len != 5) || | |
449 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { | |
450 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); | |
451 | return; | |
452 | } | |
453 | ||
454 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { | |
455 | mpl_dbg("Mesh plink: missing necessary ie\n"); | |
456 | return; | |
457 | } | |
458 | /* Note the lines below are correct, the llid in the frame is the plid | |
459 | * from the point of view of this host. | |
460 | */ | |
461 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); | |
462 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) | |
463 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); | |
464 | ||
d0709a65 JB |
465 | rcu_read_lock(); |
466 | ||
c3896d2c LCC |
467 | sta = sta_info_get(local, mgmt->sa); |
468 | if (!sta && ftype != PLINK_OPEN) { | |
469 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); | |
d0709a65 | 470 | rcu_read_unlock(); |
c3896d2c LCC |
471 | return; |
472 | } | |
473 | ||
b4e08ea1 | 474 | if (sta && sta->plink_state == PLINK_BLOCKED) { |
d0709a65 | 475 | rcu_read_unlock(); |
c3896d2c LCC |
476 | return; |
477 | } | |
478 | ||
479 | /* Now we will figure out the appropriate event... */ | |
480 | event = PLINK_UNDEFINED; | |
f698d856 | 481 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) { |
c3896d2c LCC |
482 | switch (ftype) { |
483 | case PLINK_OPEN: | |
484 | event = OPN_RJCT; | |
485 | break; | |
486 | case PLINK_CONFIRM: | |
487 | event = CNF_RJCT; | |
488 | break; | |
489 | case PLINK_CLOSE: | |
490 | /* avoid warning */ | |
491 | break; | |
492 | } | |
07346f81 | 493 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
494 | } else if (!sta) { |
495 | /* ftype == PLINK_OPEN */ | |
496 | u64 rates; | |
497 | if (!mesh_plink_free_count(sdata)) { | |
498 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
d0709a65 | 499 | rcu_read_unlock(); |
c3896d2c LCC |
500 | return; |
501 | } | |
502 | ||
503 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
03e4497e | 504 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
73651ee6 | 505 | if (!sta) { |
c3896d2c | 506 | mpl_dbg("Mesh plink error: plink table full\n"); |
d0709a65 | 507 | rcu_read_unlock(); |
c3896d2c LCC |
508 | return; |
509 | } | |
73651ee6 | 510 | if (sta_info_insert(sta)) { |
73651ee6 JB |
511 | rcu_read_unlock(); |
512 | return; | |
513 | } | |
c3896d2c | 514 | event = OPN_ACPT; |
07346f81 | 515 | spin_lock_bh(&sta->lock); |
c3896d2c | 516 | } else { |
07346f81 | 517 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
518 | switch (ftype) { |
519 | case PLINK_OPEN: | |
520 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 521 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
522 | event = OPN_IGNR; |
523 | else | |
524 | event = OPN_ACPT; | |
525 | break; | |
526 | case PLINK_CONFIRM: | |
527 | if (!mesh_plink_free_count(sdata) || | |
d0709a65 | 528 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
529 | event = CNF_IGNR; |
530 | else | |
531 | event = CNF_ACPT; | |
532 | break; | |
533 | case PLINK_CLOSE: | |
b4e08ea1 | 534 | if (sta->plink_state == PLINK_ESTAB) |
c3896d2c LCC |
535 | /* Do not check for llid or plid. This does not |
536 | * follow the standard but since multiple plinks | |
537 | * per sta are not supported, it is necessary in | |
538 | * order to avoid a livelock when MP A sees an | |
539 | * establish peer link to MP B but MP B does not | |
540 | * see it. This can be caused by a timeout in | |
541 | * B's peer link establishment or B beign | |
542 | * restarted. | |
543 | */ | |
544 | event = CLS_ACPT; | |
545 | else if (sta->plid != plid) | |
546 | event = CLS_IGNR; | |
547 | else if (ie_len == 7 && sta->llid != llid) | |
548 | event = CLS_IGNR; | |
549 | else | |
550 | event = CLS_ACPT; | |
551 | break; | |
552 | default: | |
553 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 554 | spin_unlock_bh(&sta->lock); |
d0709a65 | 555 | rcu_read_unlock(); |
c3896d2c LCC |
556 | return; |
557 | } | |
558 | } | |
559 | ||
560 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", | |
561 | print_mac(mac, mgmt->sa), sta->plink_state, | |
aa2b5928 | 562 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
c3896d2c LCC |
563 | event); |
564 | reason = 0; | |
565 | switch (sta->plink_state) { | |
566 | /* spin_unlock as soon as state is updated at each case */ | |
b4e08ea1 | 567 | case PLINK_LISTEN: |
c3896d2c LCC |
568 | switch (event) { |
569 | case CLS_ACPT: | |
570 | mesh_plink_fsm_restart(sta); | |
07346f81 | 571 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
572 | break; |
573 | case OPN_ACPT: | |
b4e08ea1 | 574 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
575 | sta->plid = plid; |
576 | get_random_bytes(&llid, 2); | |
577 | sta->llid = llid; | |
578 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 579 | spin_unlock_bh(&sta->lock); |
f698d856 | 580 | mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->addr, llid, |
c3896d2c | 581 | 0, 0); |
f698d856 | 582 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->addr, |
c3896d2c LCC |
583 | llid, plid, 0); |
584 | break; | |
585 | default: | |
07346f81 | 586 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
587 | break; |
588 | } | |
589 | break; | |
590 | ||
b4e08ea1 | 591 | case PLINK_OPN_SNT: |
c3896d2c LCC |
592 | switch (event) { |
593 | case OPN_RJCT: | |
594 | case CNF_RJCT: | |
595 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
596 | case CLS_ACPT: | |
597 | if (!reason) | |
598 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
599 | sta->reason = reason; | |
b4e08ea1 | 600 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
601 | if (!mod_plink_timer(sta, |
602 | dot11MeshHoldingTimeout(sdata))) | |
603 | sta->ignore_plink_timer = true; | |
604 | ||
605 | llid = sta->llid; | |
07346f81 | 606 | spin_unlock_bh(&sta->lock); |
f698d856 | 607 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, |
c3896d2c LCC |
608 | plid, reason); |
609 | break; | |
610 | case OPN_ACPT: | |
611 | /* retry timer is left untouched */ | |
b4e08ea1 | 612 | sta->plink_state = PLINK_OPN_RCVD; |
c3896d2c LCC |
613 | sta->plid = plid; |
614 | llid = sta->llid; | |
07346f81 | 615 | spin_unlock_bh(&sta->lock); |
f698d856 | 616 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->addr, llid, |
c3896d2c LCC |
617 | plid, 0); |
618 | break; | |
619 | case CNF_ACPT: | |
b4e08ea1 | 620 | sta->plink_state = PLINK_CNF_RCVD; |
c3896d2c LCC |
621 | if (!mod_plink_timer(sta, |
622 | dot11MeshConfirmTimeout(sdata))) | |
623 | sta->ignore_plink_timer = true; | |
624 | ||
07346f81 | 625 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
626 | break; |
627 | default: | |
07346f81 | 628 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
629 | break; |
630 | } | |
631 | break; | |
632 | ||
b4e08ea1 | 633 | case PLINK_OPN_RCVD: |
c3896d2c LCC |
634 | switch (event) { |
635 | case OPN_RJCT: | |
636 | case CNF_RJCT: | |
637 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
638 | case CLS_ACPT: | |
639 | if (!reason) | |
640 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
641 | sta->reason = reason; | |
b4e08ea1 | 642 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
643 | if (!mod_plink_timer(sta, |
644 | dot11MeshHoldingTimeout(sdata))) | |
645 | sta->ignore_plink_timer = true; | |
646 | ||
647 | llid = sta->llid; | |
07346f81 | 648 | spin_unlock_bh(&sta->lock); |
f698d856 | 649 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, |
c3896d2c LCC |
650 | plid, reason); |
651 | break; | |
652 | case OPN_ACPT: | |
653 | llid = sta->llid; | |
07346f81 | 654 | spin_unlock_bh(&sta->lock); |
f698d856 | 655 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->addr, llid, |
c3896d2c LCC |
656 | plid, 0); |
657 | break; | |
658 | case CNF_ACPT: | |
d0709a65 | 659 | del_timer(&sta->plink_timer); |
b4e08ea1 | 660 | sta->plink_state = PLINK_ESTAB; |
c3896d2c | 661 | mesh_plink_inc_estab_count(sdata); |
07346f81 | 662 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
663 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
664 | print_mac(mac, sta->addr)); | |
665 | break; | |
666 | default: | |
07346f81 | 667 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
668 | break; |
669 | } | |
670 | break; | |
671 | ||
b4e08ea1 | 672 | case PLINK_CNF_RCVD: |
c3896d2c LCC |
673 | switch (event) { |
674 | case OPN_RJCT: | |
675 | case CNF_RJCT: | |
676 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); | |
677 | case CLS_ACPT: | |
678 | if (!reason) | |
679 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
680 | sta->reason = reason; | |
b4e08ea1 | 681 | sta->plink_state = PLINK_HOLDING; |
c3896d2c LCC |
682 | if (!mod_plink_timer(sta, |
683 | dot11MeshHoldingTimeout(sdata))) | |
684 | sta->ignore_plink_timer = true; | |
685 | ||
686 | llid = sta->llid; | |
07346f81 | 687 | spin_unlock_bh(&sta->lock); |
f698d856 | 688 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, |
c3896d2c | 689 | plid, reason); |
ff59dc76 | 690 | break; |
c3896d2c | 691 | case OPN_ACPT: |
d0709a65 | 692 | del_timer(&sta->plink_timer); |
b4e08ea1 | 693 | sta->plink_state = PLINK_ESTAB; |
c3896d2c | 694 | mesh_plink_inc_estab_count(sdata); |
07346f81 | 695 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
696 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
697 | print_mac(mac, sta->addr)); | |
f698d856 | 698 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->addr, llid, |
c3896d2c LCC |
699 | plid, 0); |
700 | break; | |
701 | default: | |
07346f81 | 702 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
703 | break; |
704 | } | |
705 | break; | |
706 | ||
b4e08ea1 | 707 | case PLINK_ESTAB: |
c3896d2c LCC |
708 | switch (event) { |
709 | case CLS_ACPT: | |
710 | reason = cpu_to_le16(MESH_CLOSE_RCVD); | |
711 | sta->reason = reason; | |
902acc78 | 712 | __mesh_plink_deactivate(sta); |
b4e08ea1 | 713 | sta->plink_state = PLINK_HOLDING; |
c3896d2c | 714 | llid = sta->llid; |
d0709a65 | 715 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 716 | spin_unlock_bh(&sta->lock); |
f698d856 | 717 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, |
c3896d2c LCC |
718 | plid, reason); |
719 | break; | |
720 | case OPN_ACPT: | |
721 | llid = sta->llid; | |
07346f81 | 722 | spin_unlock_bh(&sta->lock); |
f698d856 | 723 | mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->addr, llid, |
c3896d2c LCC |
724 | plid, 0); |
725 | break; | |
726 | default: | |
07346f81 | 727 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
728 | break; |
729 | } | |
730 | break; | |
b4e08ea1 | 731 | case PLINK_HOLDING: |
c3896d2c LCC |
732 | switch (event) { |
733 | case CLS_ACPT: | |
d0709a65 | 734 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 735 | sta->ignore_plink_timer = 1; |
c3896d2c | 736 | mesh_plink_fsm_restart(sta); |
07346f81 | 737 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
738 | break; |
739 | case OPN_ACPT: | |
740 | case CNF_ACPT: | |
741 | case OPN_RJCT: | |
742 | case CNF_RJCT: | |
743 | llid = sta->llid; | |
744 | reason = sta->reason; | |
07346f81 | 745 | spin_unlock_bh(&sta->lock); |
f698d856 | 746 | mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->addr, llid, |
c3896d2c LCC |
747 | plid, reason); |
748 | break; | |
749 | default: | |
07346f81 | 750 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
751 | } |
752 | break; | |
753 | default: | |
b4e08ea1 LCC |
754 | /* should not get here, PLINK_BLOCKED is dealt with at the |
755 | * beggining of the function | |
c3896d2c | 756 | */ |
07346f81 | 757 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
758 | break; |
759 | } | |
d0709a65 JB |
760 | |
761 | rcu_read_unlock(); | |
c3896d2c | 762 | } |