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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 | ||
8db09850 TP |
22 | #define PLINK_GET_LLID(p) (p + 2) |
23 | #define PLINK_GET_PLID(p) (p + 4) | |
c3896d2c LCC |
24 | |
25 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
26 | jiffies + HZ * t / 1000)) | |
27 | ||
472dbc45 JB |
28 | #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) |
29 | #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) | |
30 | #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) | |
31 | #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) | |
32 | #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) | |
c3896d2c | 33 | |
55335137 AN |
34 | #define sta_meets_rssi_threshold(sta, sdata) \ |
35 | (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\ | |
36 | (s8) -ewma_read(&sta->avg_signal) > \ | |
37 | sdata->u.mesh.mshcfg.rssi_threshold) | |
38 | ||
c3896d2c LCC |
39 | enum plink_event { |
40 | PLINK_UNDEFINED, | |
41 | OPN_ACPT, | |
42 | OPN_RJCT, | |
43 | OPN_IGNR, | |
44 | CNF_ACPT, | |
45 | CNF_RJCT, | |
46 | CNF_IGNR, | |
47 | CLS_ACPT, | |
48 | CLS_IGNR | |
49 | }; | |
50 | ||
ba4a14e1 TP |
51 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
52 | enum ieee80211_self_protected_actioncode action, | |
53 | u8 *da, __le16 llid, __le16 plid, __le16 reason); | |
54 | ||
c3896d2c LCC |
55 | static inline |
56 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
57 | { | |
472dbc45 | 58 | atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 59 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
60 | } |
61 | ||
62 | static inline | |
63 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
64 | { | |
472dbc45 | 65 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 66 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
67 | } |
68 | ||
69 | /** | |
70 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
71 | * | |
23c7a29c | 72 | * @sta: mesh peer link to restart |
c3896d2c | 73 | * |
07346f81 | 74 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
75 | */ |
76 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
77 | { | |
57cf8043 | 78 | sta->plink_state = NL80211_PLINK_LISTEN; |
37659ff8 LCC |
79 | sta->llid = sta->plid = sta->reason = 0; |
80 | sta->plink_retries = 0; | |
c3896d2c LCC |
81 | } |
82 | ||
93e5deb1 JB |
83 | /* |
84 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
85 | * on it in the lifecycle management section! | |
86 | */ | |
03e4497e | 87 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
739522ba TP |
88 | u8 *hw_addr, u32 rates, |
89 | struct ieee802_11_elems *elems) | |
c3896d2c | 90 | { |
d0709a65 | 91 | struct ieee80211_local *local = sdata->local; |
739522ba | 92 | struct ieee80211_supported_band *sband; |
c3896d2c LCC |
93 | struct sta_info *sta; |
94 | ||
739522ba TP |
95 | sband = local->hw.wiphy->bands[local->oper_channel->band]; |
96 | ||
c3896d2c | 97 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 98 | return NULL; |
c3896d2c | 99 | |
34e89507 | 100 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
73651ee6 JB |
101 | if (!sta) |
102 | return NULL; | |
c3896d2c | 103 | |
83d5cc01 JB |
104 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
105 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
106 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
d9a7ddb0 | 107 | |
c2c98fde | 108 | set_sta_flag(sta, WLAN_STA_WME); |
d9a7ddb0 | 109 | |
323ce79a | 110 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
739522ba | 111 | if (elems->ht_cap_elem) |
ef96a842 BG |
112 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
113 | elems->ht_cap_elem, | |
739522ba | 114 | &sta->sta.ht_cap); |
b973c31a | 115 | rate_control_rate_init(sta); |
c3896d2c LCC |
116 | |
117 | return sta; | |
118 | } | |
119 | ||
120 | /** | |
c9370197 | 121 | * __mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
122 | * |
123 | * @sta: mesh peer link to deactivate | |
124 | * | |
125 | * All mesh paths with this peer as next hop will be flushed | |
126 | * | |
07346f81 | 127 | * Locking: the caller must hold sta->lock |
c3896d2c | 128 | */ |
c9370197 | 129 | static bool __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 130 | { |
d0709a65 | 131 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c9370197 | 132 | bool deactivated = false; |
d0709a65 | 133 | |
57cf8043 | 134 | if (sta->plink_state == NL80211_PLINK_ESTAB) { |
c3896d2c | 135 | mesh_plink_dec_estab_count(sdata); |
c9370197 JL |
136 | deactivated = true; |
137 | } | |
57cf8043 | 138 | sta->plink_state = NL80211_PLINK_BLOCKED; |
c3896d2c | 139 | mesh_path_flush_by_nexthop(sta); |
c9370197 JL |
140 | |
141 | return deactivated; | |
c3896d2c LCC |
142 | } |
143 | ||
902acc78 | 144 | /** |
c9370197 | 145 | * mesh_plink_deactivate - deactivate mesh peer link |
902acc78 JB |
146 | * |
147 | * @sta: mesh peer link to deactivate | |
148 | * | |
149 | * All mesh paths with this peer as next hop will be flushed | |
150 | */ | |
151 | void mesh_plink_deactivate(struct sta_info *sta) | |
152 | { | |
c9370197 JL |
153 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
154 | bool deactivated; | |
155 | ||
07346f81 | 156 | spin_lock_bh(&sta->lock); |
c9370197 | 157 | deactivated = __mesh_plink_deactivate(sta); |
ba4a14e1 TP |
158 | sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); |
159 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, | |
160 | sta->sta.addr, sta->llid, sta->plid, | |
161 | sta->reason); | |
07346f81 | 162 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
163 | |
164 | if (deactivated) | |
165 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
902acc78 JB |
166 | } |
167 | ||
f698d856 | 168 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
54ef656b TP |
169 | enum ieee80211_self_protected_actioncode action, |
170 | u8 *da, __le16 llid, __le16 plid, __le16 reason) { | |
f698d856 | 171 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 172 | struct sk_buff *skb; |
c3896d2c LCC |
173 | struct ieee80211_mgmt *mgmt; |
174 | bool include_plid = false; | |
8db09850 | 175 | u16 peering_proto = 0; |
3b69a9c5 TP |
176 | u8 *pos, ie_len = 4; |
177 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
178 | sizeof(mgmt->u.action.u.self_prot); | |
179 | ||
65e8b0cc | 180 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
181 | hdr_len + |
182 | 2 + /* capability info */ | |
183 | 2 + /* AID */ | |
184 | 2 + 8 + /* supported rates */ | |
185 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
186 | 2 + sdata->u.mesh.mesh_id_len + | |
187 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 TP |
188 | 2 + sizeof(struct ieee80211_ht_cap) + |
189 | 2 + sizeof(struct ieee80211_ht_info) + | |
3b69a9c5 TP |
190 | 2 + 8 + /* peering IE */ |
191 | sdata->u.mesh.ie_len); | |
c3896d2c LCC |
192 | if (!skb) |
193 | return -1; | |
65e8b0cc | 194 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
195 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
196 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
197 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
198 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 199 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 200 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 201 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
202 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
203 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 204 | |
8db09850 TP |
205 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
206 | /* capability info */ | |
207 | pos = skb_put(skb, 2); | |
208 | memset(pos, 0, 2); | |
54ef656b | 209 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
210 | /* AID */ |
211 | pos = skb_put(skb, 2); | |
77fa76bb | 212 | memcpy(pos + 2, &plid, 2); |
c3896d2c | 213 | } |
768db343 AN |
214 | if (ieee80211_add_srates_ie(&sdata->vif, skb) || |
215 | ieee80211_add_ext_srates_ie(&sdata->vif, skb) || | |
082ebb0c TP |
216 | mesh_add_rsn_ie(skb, sdata) || |
217 | mesh_add_meshid_ie(skb, sdata) || | |
218 | mesh_add_meshconf_ie(skb, sdata)) | |
219 | return -1; | |
8db09850 TP |
220 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
221 | if (mesh_add_meshid_ie(skb, sdata)) | |
222 | return -1; | |
c3896d2c LCC |
223 | } |
224 | ||
8db09850 | 225 | /* Add Mesh Peering Management element */ |
c3896d2c | 226 | switch (action) { |
54ef656b | 227 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 228 | break; |
54ef656b | 229 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 230 | ie_len += 2; |
c3896d2c LCC |
231 | include_plid = true; |
232 | break; | |
54ef656b | 233 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
234 | if (plid) { |
235 | ie_len += 2; | |
c3896d2c LCC |
236 | include_plid = true; |
237 | } | |
8db09850 | 238 | ie_len += 2; /* reason code */ |
c3896d2c | 239 | break; |
8db09850 TP |
240 | default: |
241 | return -EINVAL; | |
c3896d2c LCC |
242 | } |
243 | ||
8db09850 TP |
244 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
245 | return -ENOMEM; | |
246 | ||
c3896d2c | 247 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 248 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 249 | *pos++ = ie_len; |
8db09850 TP |
250 | memcpy(pos, &peering_proto, 2); |
251 | pos += 2; | |
c3896d2c | 252 | memcpy(pos, &llid, 2); |
8db09850 | 253 | pos += 2; |
c3896d2c | 254 | if (include_plid) { |
c3896d2c | 255 | memcpy(pos, &plid, 2); |
8db09850 | 256 | pos += 2; |
c3896d2c | 257 | } |
54ef656b | 258 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
c3896d2c | 259 | memcpy(pos, &reason, 2); |
8db09850 | 260 | pos += 2; |
c3896d2c | 261 | } |
176f3608 TP |
262 | |
263 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
264 | if (mesh_add_ht_cap_ie(skb, sdata) || | |
265 | mesh_add_ht_info_ie(skb, sdata)) | |
266 | return -1; | |
267 | } | |
268 | ||
8db09850 TP |
269 | if (mesh_add_vendor_ies(skb, sdata)) |
270 | return -1; | |
c3896d2c | 271 | |
62ae67be | 272 | ieee80211_tx_skb(sdata, skb); |
c3896d2c LCC |
273 | return 0; |
274 | } | |
275 | ||
1570ca59 JC |
276 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, |
277 | struct ieee80211_sub_if_data *sdata, | |
278 | struct ieee802_11_elems *elems) | |
c3896d2c | 279 | { |
f698d856 | 280 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
281 | struct sta_info *sta; |
282 | ||
d0709a65 JB |
283 | rcu_read_lock(); |
284 | ||
abe60632 | 285 | sta = sta_info_get(sdata, hw_addr); |
c3896d2c | 286 | if (!sta) { |
34e89507 | 287 | rcu_read_unlock(); |
1570ca59 JC |
288 | /* Userspace handles peer allocation when security is enabled |
289 | * */ | |
b130e5ce | 290 | if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) |
1570ca59 JC |
291 | cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr, |
292 | elems->ie_start, elems->total_len, | |
293 | GFP_KERNEL); | |
294 | else | |
739522ba | 295 | sta = mesh_plink_alloc(sdata, hw_addr, rates, elems); |
34e89507 | 296 | if (!sta) |
73651ee6 | 297 | return; |
34e89507 | 298 | if (sta_info_insert_rcu(sta)) { |
d0709a65 | 299 | rcu_read_unlock(); |
c3896d2c | 300 | return; |
d0709a65 | 301 | } |
c3896d2c LCC |
302 | } |
303 | ||
304 | sta->last_rx = jiffies; | |
323ce79a | 305 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
1570ca59 | 306 | if (mesh_peer_accepts_plinks(elems) && |
57cf8043 | 307 | sta->plink_state == NL80211_PLINK_LISTEN && |
472dbc45 | 308 | sdata->u.mesh.accepting_plinks && |
55335137 AN |
309 | sdata->u.mesh.mshcfg.auto_open_plinks && |
310 | sta_meets_rssi_threshold(sta, sdata)) | |
c3896d2c LCC |
311 | mesh_plink_open(sta); |
312 | ||
d0709a65 | 313 | rcu_read_unlock(); |
c3896d2c LCC |
314 | } |
315 | ||
316 | static void mesh_plink_timer(unsigned long data) | |
317 | { | |
318 | struct sta_info *sta; | |
319 | __le16 llid, plid, reason; | |
c3896d2c | 320 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 321 | |
d0709a65 JB |
322 | /* |
323 | * This STA is valid because sta_info_destroy() will | |
324 | * del_timer_sync() this timer after having made sure | |
325 | * it cannot be readded (by deleting the plink.) | |
326 | */ | |
c3896d2c LCC |
327 | sta = (struct sta_info *) data; |
328 | ||
5bb644a0 JB |
329 | if (sta->sdata->local->quiescing) { |
330 | sta->plink_timer_was_running = true; | |
331 | return; | |
332 | } | |
333 | ||
07346f81 | 334 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
335 | if (sta->ignore_plink_timer) { |
336 | sta->ignore_plink_timer = false; | |
07346f81 | 337 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
338 | return; |
339 | } | |
0c68ae26 JB |
340 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
341 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
342 | reason = 0; |
343 | llid = sta->llid; | |
344 | plid = sta->plid; | |
d0709a65 | 345 | sdata = sta->sdata; |
c3896d2c LCC |
346 | |
347 | switch (sta->plink_state) { | |
57cf8043 JC |
348 | case NL80211_PLINK_OPN_RCVD: |
349 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c LCC |
350 | /* retry timer */ |
351 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
352 | u32 rand; | |
0c68ae26 JB |
353 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
354 | sta->sta.addr, sta->plink_retries, | |
355 | sta->plink_timeout); | |
c3896d2c LCC |
356 | get_random_bytes(&rand, sizeof(u32)); |
357 | sta->plink_timeout = sta->plink_timeout + | |
358 | rand % sta->plink_timeout; | |
359 | ++sta->plink_retries; | |
d0709a65 | 360 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 361 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
362 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
363 | sta->sta.addr, llid, 0, 0); | |
c3896d2c LCC |
364 | break; |
365 | } | |
54ef656b | 366 | reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); |
c3896d2c | 367 | /* fall through on else */ |
57cf8043 | 368 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
369 | /* confirm timer */ |
370 | if (!reason) | |
54ef656b | 371 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); |
57cf8043 | 372 | sta->plink_state = NL80211_PLINK_HOLDING; |
d0709a65 | 373 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 374 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
375 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
376 | sta->sta.addr, llid, plid, reason); | |
c3896d2c | 377 | break; |
57cf8043 | 378 | case NL80211_PLINK_HOLDING: |
c3896d2c | 379 | /* holding timer */ |
d0709a65 | 380 | del_timer(&sta->plink_timer); |
c3896d2c | 381 | mesh_plink_fsm_restart(sta); |
07346f81 | 382 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
383 | break; |
384 | default: | |
07346f81 | 385 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
386 | break; |
387 | } | |
c3896d2c LCC |
388 | } |
389 | ||
5bb644a0 JB |
390 | #ifdef CONFIG_PM |
391 | void mesh_plink_quiesce(struct sta_info *sta) | |
392 | { | |
393 | if (del_timer_sync(&sta->plink_timer)) | |
394 | sta->plink_timer_was_running = true; | |
395 | } | |
396 | ||
397 | void mesh_plink_restart(struct sta_info *sta) | |
398 | { | |
399 | if (sta->plink_timer_was_running) { | |
400 | add_timer(&sta->plink_timer); | |
401 | sta->plink_timer_was_running = false; | |
402 | } | |
403 | } | |
404 | #endif | |
405 | ||
c3896d2c LCC |
406 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
407 | { | |
408 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
409 | sta->plink_timer.data = (unsigned long) sta; | |
410 | sta->plink_timer.function = mesh_plink_timer; | |
411 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
412 | add_timer(&sta->plink_timer); |
413 | } | |
414 | ||
415 | int mesh_plink_open(struct sta_info *sta) | |
416 | { | |
417 | __le16 llid; | |
d0709a65 | 418 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 419 | |
c2c98fde | 420 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
53e80511 JC |
421 | return -EPERM; |
422 | ||
07346f81 | 423 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
424 | get_random_bytes(&llid, 2); |
425 | sta->llid = llid; | |
57cf8043 | 426 | if (sta->plink_state != NL80211_PLINK_LISTEN) { |
07346f81 | 427 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
428 | return -EBUSY; |
429 | } | |
57cf8043 | 430 | sta->plink_state = NL80211_PLINK_OPN_SNT; |
c3896d2c | 431 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 432 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
433 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
434 | sta->sta.addr); | |
c3896d2c | 435 | |
54ef656b | 436 | return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
17741cdc | 437 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
438 | } |
439 | ||
440 | void mesh_plink_block(struct sta_info *sta) | |
441 | { | |
c9370197 JL |
442 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
443 | bool deactivated; | |
444 | ||
07346f81 | 445 | spin_lock_bh(&sta->lock); |
c9370197 | 446 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 447 | sta->plink_state = NL80211_PLINK_BLOCKED; |
07346f81 | 448 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
449 | |
450 | if (deactivated) | |
451 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
c3896d2c LCC |
452 | } |
453 | ||
c3896d2c | 454 | |
f698d856 | 455 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
456 | size_t len, struct ieee80211_rx_status *rx_status) |
457 | { | |
d0709a65 | 458 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
459 | struct ieee802_11_elems elems; |
460 | struct sta_info *sta; | |
461 | enum plink_event event; | |
54ef656b | 462 | enum ieee80211_self_protected_actioncode ftype; |
c3896d2c | 463 | size_t baselen; |
d12c7452 | 464 | bool deactivated, matches_local = true; |
c3896d2c LCC |
465 | u8 ie_len; |
466 | u8 *baseaddr; | |
467 | __le16 plid, llid, reason; | |
1460dd15 RP |
468 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
469 | static const char *mplstates[] = { | |
57cf8043 JC |
470 | [NL80211_PLINK_LISTEN] = "LISTEN", |
471 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
472 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
473 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
474 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
475 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
476 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
1460dd15 RP |
477 | }; |
478 | #endif | |
c3896d2c | 479 | |
9c80d3dc JB |
480 | /* need action_code, aux */ |
481 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
482 | return; | |
483 | ||
c3896d2c LCC |
484 | if (is_multicast_ether_addr(mgmt->da)) { |
485 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
486 | return; | |
487 | } | |
488 | ||
8db09850 TP |
489 | baseaddr = mgmt->u.action.u.self_prot.variable; |
490 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
491 | if (mgmt->u.action.u.self_prot.action_code == | |
54ef656b | 492 | WLAN_SP_MESH_PEERING_CONFIRM) { |
c3896d2c | 493 | baseaddr += 4; |
70bdb6b2 | 494 | baselen += 4; |
c3896d2c LCC |
495 | } |
496 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
8db09850 | 497 | if (!elems.peering) { |
c3896d2c LCC |
498 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
499 | return; | |
500 | } | |
b130e5ce JC |
501 | if (elems.rsn_len && |
502 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { | |
5cff5e01 JC |
503 | mpl_dbg("Mesh plink: can't establish link with secure peer\n"); |
504 | return; | |
505 | } | |
c3896d2c | 506 | |
8db09850 TP |
507 | ftype = mgmt->u.action.u.self_prot.action_code; |
508 | ie_len = elems.peering_len; | |
509 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || | |
510 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
511 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
512 | && ie_len != 8)) { | |
0938393f RP |
513 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", |
514 | ftype, ie_len); | |
c3896d2c LCC |
515 | return; |
516 | } | |
517 | ||
54ef656b TP |
518 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
519 | (!elems.mesh_id || !elems.mesh_config)) { | |
c3896d2c LCC |
520 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
521 | return; | |
522 | } | |
523 | /* Note the lines below are correct, the llid in the frame is the plid | |
524 | * from the point of view of this host. | |
525 | */ | |
8db09850 | 526 | memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); |
54ef656b | 527 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
8db09850 TP |
528 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
529 | memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); | |
c3896d2c | 530 | |
d0709a65 JB |
531 | rcu_read_lock(); |
532 | ||
abe60632 | 533 | sta = sta_info_get(sdata, mgmt->sa); |
54ef656b | 534 | if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { |
c3896d2c | 535 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
d0709a65 | 536 | rcu_read_unlock(); |
c3896d2c LCC |
537 | return; |
538 | } | |
539 | ||
55335137 AN |
540 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
541 | !sta_meets_rssi_threshold(sta, sdata)) { | |
542 | mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n", | |
543 | sta->sta.addr); | |
544 | rcu_read_unlock(); | |
545 | return; | |
546 | } | |
547 | ||
c2c98fde | 548 | if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { |
53e80511 JC |
549 | mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); |
550 | rcu_read_unlock(); | |
551 | return; | |
552 | } | |
553 | ||
57cf8043 | 554 | if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { |
d0709a65 | 555 | rcu_read_unlock(); |
c3896d2c LCC |
556 | return; |
557 | } | |
558 | ||
559 | /* Now we will figure out the appropriate event... */ | |
560 | event = PLINK_UNDEFINED; | |
54ef656b TP |
561 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
562 | (!mesh_matches_local(&elems, sdata))) { | |
d12c7452 | 563 | matches_local = false; |
c3896d2c | 564 | switch (ftype) { |
54ef656b | 565 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c LCC |
566 | event = OPN_RJCT; |
567 | break; | |
54ef656b | 568 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c LCC |
569 | event = CNF_RJCT; |
570 | break; | |
54ef656b | 571 | default: |
c3896d2c LCC |
572 | break; |
573 | } | |
d12c7452 CL |
574 | } |
575 | ||
576 | if (!sta && !matches_local) { | |
577 | rcu_read_unlock(); | |
54ef656b | 578 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
d12c7452 | 579 | llid = 0; |
54ef656b TP |
580 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
581 | mgmt->sa, llid, plid, reason); | |
d12c7452 | 582 | return; |
c3896d2c | 583 | } else if (!sta) { |
54ef656b | 584 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ |
881d948c | 585 | u32 rates; |
34e89507 JB |
586 | |
587 | rcu_read_unlock(); | |
588 | ||
c3896d2c LCC |
589 | if (!mesh_plink_free_count(sdata)) { |
590 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
591 | return; | |
592 | } | |
593 | ||
594 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
739522ba | 595 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems); |
73651ee6 | 596 | if (!sta) { |
c3896d2c LCC |
597 | mpl_dbg("Mesh plink error: plink table full\n"); |
598 | return; | |
599 | } | |
34e89507 | 600 | if (sta_info_insert_rcu(sta)) { |
73651ee6 JB |
601 | rcu_read_unlock(); |
602 | return; | |
603 | } | |
c3896d2c | 604 | event = OPN_ACPT; |
07346f81 | 605 | spin_lock_bh(&sta->lock); |
d12c7452 | 606 | } else if (matches_local) { |
07346f81 | 607 | spin_lock_bh(&sta->lock); |
c3896d2c | 608 | switch (ftype) { |
54ef656b | 609 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 610 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 611 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
612 | event = OPN_IGNR; |
613 | else | |
614 | event = OPN_ACPT; | |
615 | break; | |
54ef656b | 616 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c | 617 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 618 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
619 | event = CNF_IGNR; |
620 | else | |
621 | event = CNF_ACPT; | |
622 | break; | |
54ef656b | 623 | case WLAN_SP_MESH_PEERING_CLOSE: |
57cf8043 | 624 | if (sta->plink_state == NL80211_PLINK_ESTAB) |
c3896d2c LCC |
625 | /* Do not check for llid or plid. This does not |
626 | * follow the standard but since multiple plinks | |
627 | * per sta are not supported, it is necessary in | |
628 | * order to avoid a livelock when MP A sees an | |
629 | * establish peer link to MP B but MP B does not | |
630 | * see it. This can be caused by a timeout in | |
631 | * B's peer link establishment or B beign | |
632 | * restarted. | |
633 | */ | |
634 | event = CLS_ACPT; | |
635 | else if (sta->plid != plid) | |
636 | event = CLS_IGNR; | |
637 | else if (ie_len == 7 && sta->llid != llid) | |
638 | event = CLS_IGNR; | |
639 | else | |
640 | event = CLS_ACPT; | |
641 | break; | |
642 | default: | |
643 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 644 | spin_unlock_bh(&sta->lock); |
d0709a65 | 645 | rcu_read_unlock(); |
c3896d2c LCC |
646 | return; |
647 | } | |
d12c7452 CL |
648 | } else { |
649 | spin_lock_bh(&sta->lock); | |
c3896d2c LCC |
650 | } |
651 | ||
1460dd15 RP |
652 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
653 | mgmt->sa, mplstates[sta->plink_state], | |
0c68ae26 JB |
654 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
655 | event); | |
c3896d2c LCC |
656 | reason = 0; |
657 | switch (sta->plink_state) { | |
658 | /* spin_unlock as soon as state is updated at each case */ | |
57cf8043 | 659 | case NL80211_PLINK_LISTEN: |
c3896d2c LCC |
660 | switch (event) { |
661 | case CLS_ACPT: | |
662 | mesh_plink_fsm_restart(sta); | |
07346f81 | 663 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
664 | break; |
665 | case OPN_ACPT: | |
57cf8043 | 666 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
667 | sta->plid = plid; |
668 | get_random_bytes(&llid, 2); | |
669 | sta->llid = llid; | |
670 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 671 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
672 | mesh_plink_frame_tx(sdata, |
673 | WLAN_SP_MESH_PEERING_OPEN, | |
674 | sta->sta.addr, llid, 0, 0); | |
675 | mesh_plink_frame_tx(sdata, | |
676 | WLAN_SP_MESH_PEERING_CONFIRM, | |
677 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
678 | break; |
679 | default: | |
07346f81 | 680 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
681 | break; |
682 | } | |
683 | break; | |
684 | ||
57cf8043 | 685 | case NL80211_PLINK_OPN_SNT: |
c3896d2c LCC |
686 | switch (event) { |
687 | case OPN_RJCT: | |
688 | case CNF_RJCT: | |
54ef656b | 689 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
690 | case CLS_ACPT: |
691 | if (!reason) | |
54ef656b | 692 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 693 | sta->reason = reason; |
57cf8043 | 694 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
695 | if (!mod_plink_timer(sta, |
696 | dot11MeshHoldingTimeout(sdata))) | |
697 | sta->ignore_plink_timer = true; | |
698 | ||
699 | llid = sta->llid; | |
07346f81 | 700 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
701 | mesh_plink_frame_tx(sdata, |
702 | WLAN_SP_MESH_PEERING_CLOSE, | |
703 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
704 | break; |
705 | case OPN_ACPT: | |
706 | /* retry timer is left untouched */ | |
57cf8043 | 707 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
708 | sta->plid = plid; |
709 | llid = sta->llid; | |
07346f81 | 710 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
711 | mesh_plink_frame_tx(sdata, |
712 | WLAN_SP_MESH_PEERING_CONFIRM, | |
713 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
714 | break; |
715 | case CNF_ACPT: | |
57cf8043 | 716 | sta->plink_state = NL80211_PLINK_CNF_RCVD; |
c3896d2c LCC |
717 | if (!mod_plink_timer(sta, |
718 | dot11MeshConfirmTimeout(sdata))) | |
719 | sta->ignore_plink_timer = true; | |
720 | ||
07346f81 | 721 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
722 | break; |
723 | default: | |
07346f81 | 724 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
725 | break; |
726 | } | |
727 | break; | |
728 | ||
57cf8043 | 729 | case NL80211_PLINK_OPN_RCVD: |
c3896d2c LCC |
730 | switch (event) { |
731 | case OPN_RJCT: | |
732 | case CNF_RJCT: | |
54ef656b | 733 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
734 | case CLS_ACPT: |
735 | if (!reason) | |
54ef656b | 736 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 737 | sta->reason = reason; |
57cf8043 | 738 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
739 | if (!mod_plink_timer(sta, |
740 | dot11MeshHoldingTimeout(sdata))) | |
741 | sta->ignore_plink_timer = true; | |
742 | ||
743 | llid = sta->llid; | |
07346f81 | 744 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
745 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
746 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
747 | break; |
748 | case OPN_ACPT: | |
749 | llid = sta->llid; | |
07346f81 | 750 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
751 | mesh_plink_frame_tx(sdata, |
752 | WLAN_SP_MESH_PEERING_CONFIRM, | |
753 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
754 | break; |
755 | case CNF_ACPT: | |
d0709a65 | 756 | del_timer(&sta->plink_timer); |
57cf8043 | 757 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 758 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
759 | mesh_plink_inc_estab_count(sdata); |
760 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
761 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
762 | sta->sta.addr); | |
c3896d2c LCC |
763 | break; |
764 | default: | |
07346f81 | 765 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
766 | break; |
767 | } | |
768 | break; | |
769 | ||
57cf8043 | 770 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
771 | switch (event) { |
772 | case OPN_RJCT: | |
773 | case CNF_RJCT: | |
54ef656b | 774 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
775 | case CLS_ACPT: |
776 | if (!reason) | |
54ef656b | 777 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 778 | sta->reason = reason; |
57cf8043 | 779 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
780 | if (!mod_plink_timer(sta, |
781 | dot11MeshHoldingTimeout(sdata))) | |
782 | sta->ignore_plink_timer = true; | |
783 | ||
784 | llid = sta->llid; | |
07346f81 | 785 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
786 | mesh_plink_frame_tx(sdata, |
787 | WLAN_SP_MESH_PEERING_CLOSE, | |
788 | sta->sta.addr, llid, plid, reason); | |
ff59dc76 | 789 | break; |
c3896d2c | 790 | case OPN_ACPT: |
d0709a65 | 791 | del_timer(&sta->plink_timer); |
57cf8043 | 792 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 793 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
794 | mesh_plink_inc_estab_count(sdata); |
795 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
796 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
797 | sta->sta.addr); | |
54ef656b TP |
798 | mesh_plink_frame_tx(sdata, |
799 | WLAN_SP_MESH_PEERING_CONFIRM, | |
800 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
801 | break; |
802 | default: | |
07346f81 | 803 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
804 | break; |
805 | } | |
806 | break; | |
807 | ||
57cf8043 | 808 | case NL80211_PLINK_ESTAB: |
c3896d2c LCC |
809 | switch (event) { |
810 | case CLS_ACPT: | |
54ef656b | 811 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 812 | sta->reason = reason; |
c9370197 | 813 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 814 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c | 815 | llid = sta->llid; |
d0709a65 | 816 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 817 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
818 | if (deactivated) |
819 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
54ef656b TP |
820 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
821 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
822 | break; |
823 | case OPN_ACPT: | |
824 | llid = sta->llid; | |
07346f81 | 825 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
826 | mesh_plink_frame_tx(sdata, |
827 | WLAN_SP_MESH_PEERING_CONFIRM, | |
828 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
829 | break; |
830 | default: | |
07346f81 | 831 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
832 | break; |
833 | } | |
834 | break; | |
57cf8043 | 835 | case NL80211_PLINK_HOLDING: |
c3896d2c LCC |
836 | switch (event) { |
837 | case CLS_ACPT: | |
d0709a65 | 838 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 839 | sta->ignore_plink_timer = 1; |
c3896d2c | 840 | mesh_plink_fsm_restart(sta); |
07346f81 | 841 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
842 | break; |
843 | case OPN_ACPT: | |
844 | case CNF_ACPT: | |
845 | case OPN_RJCT: | |
846 | case CNF_RJCT: | |
847 | llid = sta->llid; | |
848 | reason = sta->reason; | |
07346f81 | 849 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
850 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
851 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
852 | break; |
853 | default: | |
07346f81 | 854 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
855 | } |
856 | break; | |
857 | default: | |
b4e08ea1 | 858 | /* should not get here, PLINK_BLOCKED is dealt with at the |
3ad2f3fb | 859 | * beginning of the function |
c3896d2c | 860 | */ |
07346f81 | 861 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
862 | break; |
863 | } | |
d0709a65 JB |
864 | |
865 | rcu_read_unlock(); | |
c3896d2c | 866 | } |