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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 | ||
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 | |
c3896d2c LCC |
34 | enum plink_event { |
35 | PLINK_UNDEFINED, | |
36 | OPN_ACPT, | |
37 | OPN_RJCT, | |
38 | OPN_IGNR, | |
39 | CNF_ACPT, | |
40 | CNF_RJCT, | |
41 | CNF_IGNR, | |
42 | CLS_ACPT, | |
43 | CLS_IGNR | |
44 | }; | |
45 | ||
ba4a14e1 TP |
46 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
47 | enum ieee80211_self_protected_actioncode action, | |
48 | u8 *da, __le16 llid, __le16 plid, __le16 reason); | |
49 | ||
c3896d2c LCC |
50 | static inline |
51 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
52 | { | |
472dbc45 | 53 | atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 54 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
55 | } |
56 | ||
57 | static inline | |
58 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
59 | { | |
472dbc45 | 60 | atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); |
d0709a65 | 61 | mesh_accept_plinks_update(sdata); |
c3896d2c LCC |
62 | } |
63 | ||
64 | /** | |
65 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
66 | * | |
23c7a29c | 67 | * @sta: mesh peer link to restart |
c3896d2c | 68 | * |
07346f81 | 69 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
70 | */ |
71 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
72 | { | |
57cf8043 | 73 | sta->plink_state = NL80211_PLINK_LISTEN; |
37659ff8 LCC |
74 | sta->llid = sta->plid = sta->reason = 0; |
75 | sta->plink_retries = 0; | |
c3896d2c LCC |
76 | } |
77 | ||
93e5deb1 JB |
78 | /* |
79 | * NOTE: This is just an alias for sta_info_alloc(), see notes | |
80 | * on it in the lifecycle management section! | |
81 | */ | |
03e4497e | 82 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
739522ba TP |
83 | u8 *hw_addr, u32 rates, |
84 | struct ieee802_11_elems *elems) | |
c3896d2c | 85 | { |
d0709a65 | 86 | struct ieee80211_local *local = sdata->local; |
739522ba | 87 | struct ieee80211_supported_band *sband; |
c3896d2c LCC |
88 | struct sta_info *sta; |
89 | ||
739522ba TP |
90 | sband = local->hw.wiphy->bands[local->oper_channel->band]; |
91 | ||
c3896d2c | 92 | if (local->num_sta >= MESH_MAX_PLINKS) |
73651ee6 | 93 | return NULL; |
c3896d2c | 94 | |
34e89507 | 95 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
73651ee6 JB |
96 | if (!sta) |
97 | return NULL; | |
c3896d2c | 98 | |
83d5cc01 JB |
99 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
100 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
101 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
d9a7ddb0 | 102 | |
c2c98fde | 103 | set_sta_flag(sta, WLAN_STA_WME); |
d9a7ddb0 | 104 | |
323ce79a | 105 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
739522ba | 106 | if (elems->ht_cap_elem) |
ef96a842 BG |
107 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
108 | elems->ht_cap_elem, | |
739522ba | 109 | &sta->sta.ht_cap); |
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 | |
57cf8043 | 129 | if (sta->plink_state == NL80211_PLINK_ESTAB) { |
c3896d2c | 130 | mesh_plink_dec_estab_count(sdata); |
c9370197 JL |
131 | deactivated = true; |
132 | } | |
57cf8043 | 133 | sta->plink_state = NL80211_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); |
ba4a14e1 TP |
153 | sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); |
154 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, | |
155 | sta->sta.addr, sta->llid, sta->plid, | |
156 | sta->reason); | |
07346f81 | 157 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
158 | |
159 | if (deactivated) | |
160 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
902acc78 JB |
161 | } |
162 | ||
f698d856 | 163 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
54ef656b TP |
164 | enum ieee80211_self_protected_actioncode action, |
165 | u8 *da, __le16 llid, __le16 plid, __le16 reason) { | |
f698d856 | 166 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 167 | struct sk_buff *skb; |
c3896d2c LCC |
168 | struct ieee80211_mgmt *mgmt; |
169 | bool include_plid = false; | |
8db09850 | 170 | u16 peering_proto = 0; |
3b69a9c5 TP |
171 | u8 *pos, ie_len = 4; |
172 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
173 | sizeof(mgmt->u.action.u.self_prot); | |
174 | ||
65e8b0cc | 175 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
176 | hdr_len + |
177 | 2 + /* capability info */ | |
178 | 2 + /* AID */ | |
179 | 2 + 8 + /* supported rates */ | |
180 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
181 | 2 + sdata->u.mesh.mesh_id_len + | |
182 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 TP |
183 | 2 + sizeof(struct ieee80211_ht_cap) + |
184 | 2 + sizeof(struct ieee80211_ht_info) + | |
3b69a9c5 TP |
185 | 2 + 8 + /* peering IE */ |
186 | sdata->u.mesh.ie_len); | |
c3896d2c LCC |
187 | if (!skb) |
188 | return -1; | |
65e8b0cc | 189 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
190 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
191 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
192 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
193 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 194 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 195 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 196 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
197 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
198 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 199 | |
8db09850 TP |
200 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
201 | /* capability info */ | |
202 | pos = skb_put(skb, 2); | |
203 | memset(pos, 0, 2); | |
54ef656b | 204 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
205 | /* AID */ |
206 | pos = skb_put(skb, 2); | |
77fa76bb | 207 | memcpy(pos + 2, &plid, 2); |
c3896d2c | 208 | } |
768db343 AN |
209 | if (ieee80211_add_srates_ie(&sdata->vif, skb) || |
210 | ieee80211_add_ext_srates_ie(&sdata->vif, skb) || | |
082ebb0c TP |
211 | mesh_add_rsn_ie(skb, sdata) || |
212 | mesh_add_meshid_ie(skb, sdata) || | |
213 | mesh_add_meshconf_ie(skb, sdata)) | |
214 | return -1; | |
8db09850 TP |
215 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
216 | if (mesh_add_meshid_ie(skb, sdata)) | |
217 | return -1; | |
c3896d2c LCC |
218 | } |
219 | ||
8db09850 | 220 | /* Add Mesh Peering Management element */ |
c3896d2c | 221 | switch (action) { |
54ef656b | 222 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 223 | break; |
54ef656b | 224 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 225 | ie_len += 2; |
c3896d2c LCC |
226 | include_plid = true; |
227 | break; | |
54ef656b | 228 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
229 | if (plid) { |
230 | ie_len += 2; | |
c3896d2c LCC |
231 | include_plid = true; |
232 | } | |
8db09850 | 233 | ie_len += 2; /* reason code */ |
c3896d2c | 234 | break; |
8db09850 TP |
235 | default: |
236 | return -EINVAL; | |
c3896d2c LCC |
237 | } |
238 | ||
8db09850 TP |
239 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
240 | return -ENOMEM; | |
241 | ||
c3896d2c | 242 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 243 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 244 | *pos++ = ie_len; |
8db09850 TP |
245 | memcpy(pos, &peering_proto, 2); |
246 | pos += 2; | |
c3896d2c | 247 | memcpy(pos, &llid, 2); |
8db09850 | 248 | pos += 2; |
c3896d2c | 249 | if (include_plid) { |
c3896d2c | 250 | memcpy(pos, &plid, 2); |
8db09850 | 251 | pos += 2; |
c3896d2c | 252 | } |
54ef656b | 253 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
c3896d2c | 254 | memcpy(pos, &reason, 2); |
8db09850 | 255 | pos += 2; |
c3896d2c | 256 | } |
176f3608 TP |
257 | |
258 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
259 | if (mesh_add_ht_cap_ie(skb, sdata) || | |
260 | mesh_add_ht_info_ie(skb, sdata)) | |
261 | return -1; | |
262 | } | |
263 | ||
8db09850 TP |
264 | if (mesh_add_vendor_ies(skb, sdata)) |
265 | return -1; | |
c3896d2c | 266 | |
62ae67be | 267 | ieee80211_tx_skb(sdata, skb); |
c3896d2c LCC |
268 | return 0; |
269 | } | |
270 | ||
1570ca59 JC |
271 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, |
272 | struct ieee80211_sub_if_data *sdata, | |
273 | struct ieee802_11_elems *elems) | |
c3896d2c | 274 | { |
f698d856 | 275 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
276 | struct sta_info *sta; |
277 | ||
d0709a65 JB |
278 | rcu_read_lock(); |
279 | ||
abe60632 | 280 | sta = sta_info_get(sdata, hw_addr); |
c3896d2c | 281 | if (!sta) { |
34e89507 | 282 | rcu_read_unlock(); |
1570ca59 JC |
283 | /* Userspace handles peer allocation when security is enabled |
284 | * */ | |
b130e5ce | 285 | if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) |
1570ca59 JC |
286 | cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr, |
287 | elems->ie_start, elems->total_len, | |
288 | GFP_KERNEL); | |
289 | else | |
739522ba | 290 | sta = mesh_plink_alloc(sdata, hw_addr, rates, elems); |
34e89507 | 291 | if (!sta) |
73651ee6 | 292 | return; |
34e89507 | 293 | if (sta_info_insert_rcu(sta)) { |
d0709a65 | 294 | rcu_read_unlock(); |
c3896d2c | 295 | return; |
d0709a65 | 296 | } |
c3896d2c LCC |
297 | } |
298 | ||
299 | sta->last_rx = jiffies; | |
323ce79a | 300 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
1570ca59 | 301 | if (mesh_peer_accepts_plinks(elems) && |
57cf8043 | 302 | sta->plink_state == NL80211_PLINK_LISTEN && |
472dbc45 JB |
303 | sdata->u.mesh.accepting_plinks && |
304 | sdata->u.mesh.mshcfg.auto_open_plinks) | |
c3896d2c LCC |
305 | mesh_plink_open(sta); |
306 | ||
d0709a65 | 307 | rcu_read_unlock(); |
c3896d2c LCC |
308 | } |
309 | ||
310 | static void mesh_plink_timer(unsigned long data) | |
311 | { | |
312 | struct sta_info *sta; | |
313 | __le16 llid, plid, reason; | |
c3896d2c | 314 | struct ieee80211_sub_if_data *sdata; |
c3896d2c | 315 | |
d0709a65 JB |
316 | /* |
317 | * This STA is valid because sta_info_destroy() will | |
318 | * del_timer_sync() this timer after having made sure | |
319 | * it cannot be readded (by deleting the plink.) | |
320 | */ | |
c3896d2c LCC |
321 | sta = (struct sta_info *) data; |
322 | ||
5bb644a0 JB |
323 | if (sta->sdata->local->quiescing) { |
324 | sta->plink_timer_was_running = true; | |
325 | return; | |
326 | } | |
327 | ||
07346f81 | 328 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
329 | if (sta->ignore_plink_timer) { |
330 | sta->ignore_plink_timer = false; | |
07346f81 | 331 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
332 | return; |
333 | } | |
0c68ae26 JB |
334 | mpl_dbg("Mesh plink timer for %pM fired on state %d\n", |
335 | sta->sta.addr, sta->plink_state); | |
c3896d2c LCC |
336 | reason = 0; |
337 | llid = sta->llid; | |
338 | plid = sta->plid; | |
d0709a65 | 339 | sdata = sta->sdata; |
c3896d2c LCC |
340 | |
341 | switch (sta->plink_state) { | |
57cf8043 JC |
342 | case NL80211_PLINK_OPN_RCVD: |
343 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c LCC |
344 | /* retry timer */ |
345 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { | |
346 | u32 rand; | |
0c68ae26 JB |
347 | mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n", |
348 | sta->sta.addr, sta->plink_retries, | |
349 | sta->plink_timeout); | |
c3896d2c LCC |
350 | get_random_bytes(&rand, sizeof(u32)); |
351 | sta->plink_timeout = sta->plink_timeout + | |
352 | rand % sta->plink_timeout; | |
353 | ++sta->plink_retries; | |
d0709a65 | 354 | mod_plink_timer(sta, sta->plink_timeout); |
07346f81 | 355 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
356 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
357 | sta->sta.addr, llid, 0, 0); | |
c3896d2c LCC |
358 | break; |
359 | } | |
54ef656b | 360 | reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); |
c3896d2c | 361 | /* fall through on else */ |
57cf8043 | 362 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
363 | /* confirm timer */ |
364 | if (!reason) | |
54ef656b | 365 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); |
57cf8043 | 366 | sta->plink_state = NL80211_PLINK_HOLDING; |
d0709a65 | 367 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 368 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
369 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
370 | sta->sta.addr, llid, plid, reason); | |
c3896d2c | 371 | break; |
57cf8043 | 372 | case NL80211_PLINK_HOLDING: |
c3896d2c | 373 | /* holding timer */ |
d0709a65 | 374 | del_timer(&sta->plink_timer); |
c3896d2c | 375 | mesh_plink_fsm_restart(sta); |
07346f81 | 376 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
377 | break; |
378 | default: | |
07346f81 | 379 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
380 | break; |
381 | } | |
c3896d2c LCC |
382 | } |
383 | ||
5bb644a0 JB |
384 | #ifdef CONFIG_PM |
385 | void mesh_plink_quiesce(struct sta_info *sta) | |
386 | { | |
387 | if (del_timer_sync(&sta->plink_timer)) | |
388 | sta->plink_timer_was_running = true; | |
389 | } | |
390 | ||
391 | void mesh_plink_restart(struct sta_info *sta) | |
392 | { | |
393 | if (sta->plink_timer_was_running) { | |
394 | add_timer(&sta->plink_timer); | |
395 | sta->plink_timer_was_running = false; | |
396 | } | |
397 | } | |
398 | #endif | |
399 | ||
c3896d2c LCC |
400 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
401 | { | |
402 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); | |
403 | sta->plink_timer.data = (unsigned long) sta; | |
404 | sta->plink_timer.function = mesh_plink_timer; | |
405 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
406 | add_timer(&sta->plink_timer); |
407 | } | |
408 | ||
409 | int mesh_plink_open(struct sta_info *sta) | |
410 | { | |
411 | __le16 llid; | |
d0709a65 | 412 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c3896d2c | 413 | |
c2c98fde | 414 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
53e80511 JC |
415 | return -EPERM; |
416 | ||
07346f81 | 417 | spin_lock_bh(&sta->lock); |
c3896d2c LCC |
418 | get_random_bytes(&llid, 2); |
419 | sta->llid = llid; | |
57cf8043 | 420 | if (sta->plink_state != NL80211_PLINK_LISTEN) { |
07346f81 | 421 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
422 | return -EBUSY; |
423 | } | |
57cf8043 | 424 | sta->plink_state = NL80211_PLINK_OPN_SNT; |
c3896d2c | 425 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
07346f81 | 426 | spin_unlock_bh(&sta->lock); |
0c68ae26 JB |
427 | mpl_dbg("Mesh plink: starting establishment with %pM\n", |
428 | sta->sta.addr); | |
c3896d2c | 429 | |
54ef656b | 430 | return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
17741cdc | 431 | sta->sta.addr, llid, 0, 0); |
c3896d2c LCC |
432 | } |
433 | ||
434 | void mesh_plink_block(struct sta_info *sta) | |
435 | { | |
c9370197 JL |
436 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
437 | bool deactivated; | |
438 | ||
07346f81 | 439 | spin_lock_bh(&sta->lock); |
c9370197 | 440 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 441 | sta->plink_state = NL80211_PLINK_BLOCKED; |
07346f81 | 442 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
443 | |
444 | if (deactivated) | |
445 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
c3896d2c LCC |
446 | } |
447 | ||
c3896d2c | 448 | |
f698d856 | 449 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, |
c3896d2c LCC |
450 | size_t len, struct ieee80211_rx_status *rx_status) |
451 | { | |
d0709a65 | 452 | struct ieee80211_local *local = sdata->local; |
c3896d2c LCC |
453 | struct ieee802_11_elems elems; |
454 | struct sta_info *sta; | |
455 | enum plink_event event; | |
54ef656b | 456 | enum ieee80211_self_protected_actioncode ftype; |
c3896d2c | 457 | size_t baselen; |
d12c7452 | 458 | bool deactivated, matches_local = true; |
c3896d2c LCC |
459 | u8 ie_len; |
460 | u8 *baseaddr; | |
461 | __le16 plid, llid, reason; | |
1460dd15 RP |
462 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
463 | static const char *mplstates[] = { | |
57cf8043 JC |
464 | [NL80211_PLINK_LISTEN] = "LISTEN", |
465 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
466 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
467 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
468 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
469 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
470 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
1460dd15 RP |
471 | }; |
472 | #endif | |
c3896d2c | 473 | |
9c80d3dc JB |
474 | /* need action_code, aux */ |
475 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
476 | return; | |
477 | ||
c3896d2c LCC |
478 | if (is_multicast_ether_addr(mgmt->da)) { |
479 | mpl_dbg("Mesh plink: ignore frame from multicast address"); | |
480 | return; | |
481 | } | |
482 | ||
8db09850 TP |
483 | baseaddr = mgmt->u.action.u.self_prot.variable; |
484 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
485 | if (mgmt->u.action.u.self_prot.action_code == | |
54ef656b | 486 | WLAN_SP_MESH_PEERING_CONFIRM) { |
c3896d2c | 487 | baseaddr += 4; |
70bdb6b2 | 488 | baselen += 4; |
c3896d2c LCC |
489 | } |
490 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); | |
8db09850 | 491 | if (!elems.peering) { |
c3896d2c LCC |
492 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
493 | return; | |
494 | } | |
b130e5ce JC |
495 | if (elems.rsn_len && |
496 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { | |
5cff5e01 JC |
497 | mpl_dbg("Mesh plink: can't establish link with secure peer\n"); |
498 | return; | |
499 | } | |
c3896d2c | 500 | |
8db09850 TP |
501 | ftype = mgmt->u.action.u.self_prot.action_code; |
502 | ie_len = elems.peering_len; | |
503 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || | |
504 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
505 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
506 | && ie_len != 8)) { | |
0938393f RP |
507 | mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", |
508 | ftype, ie_len); | |
c3896d2c LCC |
509 | return; |
510 | } | |
511 | ||
54ef656b TP |
512 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
513 | (!elems.mesh_id || !elems.mesh_config)) { | |
c3896d2c LCC |
514 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
515 | return; | |
516 | } | |
517 | /* Note the lines below are correct, the llid in the frame is the plid | |
518 | * from the point of view of this host. | |
519 | */ | |
8db09850 | 520 | memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); |
54ef656b | 521 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
8db09850 TP |
522 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
523 | memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); | |
c3896d2c | 524 | |
d0709a65 JB |
525 | rcu_read_lock(); |
526 | ||
abe60632 | 527 | sta = sta_info_get(sdata, mgmt->sa); |
54ef656b | 528 | if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { |
c3896d2c | 529 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
d0709a65 | 530 | rcu_read_unlock(); |
c3896d2c LCC |
531 | return; |
532 | } | |
533 | ||
c2c98fde | 534 | if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { |
53e80511 JC |
535 | mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); |
536 | rcu_read_unlock(); | |
537 | return; | |
538 | } | |
539 | ||
57cf8043 | 540 | if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { |
d0709a65 | 541 | rcu_read_unlock(); |
c3896d2c LCC |
542 | return; |
543 | } | |
544 | ||
545 | /* Now we will figure out the appropriate event... */ | |
546 | event = PLINK_UNDEFINED; | |
54ef656b TP |
547 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
548 | (!mesh_matches_local(&elems, sdata))) { | |
d12c7452 | 549 | matches_local = false; |
c3896d2c | 550 | switch (ftype) { |
54ef656b | 551 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c LCC |
552 | event = OPN_RJCT; |
553 | break; | |
54ef656b | 554 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c LCC |
555 | event = CNF_RJCT; |
556 | break; | |
54ef656b | 557 | default: |
c3896d2c LCC |
558 | break; |
559 | } | |
d12c7452 CL |
560 | } |
561 | ||
562 | if (!sta && !matches_local) { | |
563 | rcu_read_unlock(); | |
54ef656b | 564 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
d12c7452 | 565 | llid = 0; |
54ef656b TP |
566 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
567 | mgmt->sa, llid, plid, reason); | |
d12c7452 | 568 | return; |
c3896d2c | 569 | } else if (!sta) { |
54ef656b | 570 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ |
881d948c | 571 | u32 rates; |
34e89507 JB |
572 | |
573 | rcu_read_unlock(); | |
574 | ||
c3896d2c LCC |
575 | if (!mesh_plink_free_count(sdata)) { |
576 | mpl_dbg("Mesh plink error: no more free plinks\n"); | |
577 | return; | |
578 | } | |
579 | ||
580 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); | |
739522ba | 581 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems); |
73651ee6 | 582 | if (!sta) { |
c3896d2c LCC |
583 | mpl_dbg("Mesh plink error: plink table full\n"); |
584 | return; | |
585 | } | |
34e89507 | 586 | if (sta_info_insert_rcu(sta)) { |
73651ee6 JB |
587 | rcu_read_unlock(); |
588 | return; | |
589 | } | |
c3896d2c | 590 | event = OPN_ACPT; |
07346f81 | 591 | spin_lock_bh(&sta->lock); |
d12c7452 | 592 | } else if (matches_local) { |
07346f81 | 593 | spin_lock_bh(&sta->lock); |
c3896d2c | 594 | switch (ftype) { |
54ef656b | 595 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 596 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 597 | (sta->plid && sta->plid != plid)) |
c3896d2c LCC |
598 | event = OPN_IGNR; |
599 | else | |
600 | event = OPN_ACPT; | |
601 | break; | |
54ef656b | 602 | case WLAN_SP_MESH_PEERING_CONFIRM: |
c3896d2c | 603 | if (!mesh_plink_free_count(sdata) || |
d0709a65 | 604 | (sta->llid != llid || sta->plid != plid)) |
c3896d2c LCC |
605 | event = CNF_IGNR; |
606 | else | |
607 | event = CNF_ACPT; | |
608 | break; | |
54ef656b | 609 | case WLAN_SP_MESH_PEERING_CLOSE: |
57cf8043 | 610 | if (sta->plink_state == NL80211_PLINK_ESTAB) |
c3896d2c LCC |
611 | /* Do not check for llid or plid. This does not |
612 | * follow the standard but since multiple plinks | |
613 | * per sta are not supported, it is necessary in | |
614 | * order to avoid a livelock when MP A sees an | |
615 | * establish peer link to MP B but MP B does not | |
616 | * see it. This can be caused by a timeout in | |
617 | * B's peer link establishment or B beign | |
618 | * restarted. | |
619 | */ | |
620 | event = CLS_ACPT; | |
621 | else if (sta->plid != plid) | |
622 | event = CLS_IGNR; | |
623 | else if (ie_len == 7 && sta->llid != llid) | |
624 | event = CLS_IGNR; | |
625 | else | |
626 | event = CLS_ACPT; | |
627 | break; | |
628 | default: | |
629 | mpl_dbg("Mesh plink: unknown frame subtype\n"); | |
07346f81 | 630 | spin_unlock_bh(&sta->lock); |
d0709a65 | 631 | rcu_read_unlock(); |
c3896d2c LCC |
632 | return; |
633 | } | |
d12c7452 CL |
634 | } else { |
635 | spin_lock_bh(&sta->lock); | |
c3896d2c LCC |
636 | } |
637 | ||
1460dd15 RP |
638 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", |
639 | mgmt->sa, mplstates[sta->plink_state], | |
0c68ae26 JB |
640 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
641 | event); | |
c3896d2c LCC |
642 | reason = 0; |
643 | switch (sta->plink_state) { | |
644 | /* spin_unlock as soon as state is updated at each case */ | |
57cf8043 | 645 | case NL80211_PLINK_LISTEN: |
c3896d2c LCC |
646 | switch (event) { |
647 | case CLS_ACPT: | |
648 | mesh_plink_fsm_restart(sta); | |
07346f81 | 649 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
650 | break; |
651 | case OPN_ACPT: | |
57cf8043 | 652 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
653 | sta->plid = plid; |
654 | get_random_bytes(&llid, 2); | |
655 | sta->llid = llid; | |
656 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); | |
07346f81 | 657 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
658 | mesh_plink_frame_tx(sdata, |
659 | WLAN_SP_MESH_PEERING_OPEN, | |
660 | sta->sta.addr, llid, 0, 0); | |
661 | mesh_plink_frame_tx(sdata, | |
662 | WLAN_SP_MESH_PEERING_CONFIRM, | |
663 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
664 | break; |
665 | default: | |
07346f81 | 666 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
667 | break; |
668 | } | |
669 | break; | |
670 | ||
57cf8043 | 671 | case NL80211_PLINK_OPN_SNT: |
c3896d2c LCC |
672 | switch (event) { |
673 | case OPN_RJCT: | |
674 | case CNF_RJCT: | |
54ef656b | 675 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
676 | case CLS_ACPT: |
677 | if (!reason) | |
54ef656b | 678 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 679 | sta->reason = reason; |
57cf8043 | 680 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
681 | if (!mod_plink_timer(sta, |
682 | dot11MeshHoldingTimeout(sdata))) | |
683 | sta->ignore_plink_timer = true; | |
684 | ||
685 | llid = sta->llid; | |
07346f81 | 686 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
687 | mesh_plink_frame_tx(sdata, |
688 | WLAN_SP_MESH_PEERING_CLOSE, | |
689 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
690 | break; |
691 | case OPN_ACPT: | |
692 | /* retry timer is left untouched */ | |
57cf8043 | 693 | sta->plink_state = NL80211_PLINK_OPN_RCVD; |
c3896d2c LCC |
694 | sta->plid = plid; |
695 | llid = sta->llid; | |
07346f81 | 696 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
697 | mesh_plink_frame_tx(sdata, |
698 | WLAN_SP_MESH_PEERING_CONFIRM, | |
699 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
700 | break; |
701 | case CNF_ACPT: | |
57cf8043 | 702 | sta->plink_state = NL80211_PLINK_CNF_RCVD; |
c3896d2c LCC |
703 | if (!mod_plink_timer(sta, |
704 | dot11MeshConfirmTimeout(sdata))) | |
705 | sta->ignore_plink_timer = true; | |
706 | ||
07346f81 | 707 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
708 | break; |
709 | default: | |
07346f81 | 710 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
711 | break; |
712 | } | |
713 | break; | |
714 | ||
57cf8043 | 715 | case NL80211_PLINK_OPN_RCVD: |
c3896d2c LCC |
716 | switch (event) { |
717 | case OPN_RJCT: | |
718 | case CNF_RJCT: | |
54ef656b | 719 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
720 | case CLS_ACPT: |
721 | if (!reason) | |
54ef656b | 722 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 723 | sta->reason = reason; |
57cf8043 | 724 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
725 | if (!mod_plink_timer(sta, |
726 | dot11MeshHoldingTimeout(sdata))) | |
727 | sta->ignore_plink_timer = true; | |
728 | ||
729 | llid = sta->llid; | |
07346f81 | 730 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
731 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
732 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
733 | break; |
734 | case OPN_ACPT: | |
735 | llid = sta->llid; | |
07346f81 | 736 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
737 | mesh_plink_frame_tx(sdata, |
738 | WLAN_SP_MESH_PEERING_CONFIRM, | |
739 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
740 | break; |
741 | case CNF_ACPT: | |
d0709a65 | 742 | del_timer(&sta->plink_timer); |
57cf8043 | 743 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 744 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
745 | mesh_plink_inc_estab_count(sdata); |
746 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
747 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
748 | sta->sta.addr); | |
c3896d2c LCC |
749 | break; |
750 | default: | |
07346f81 | 751 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
752 | break; |
753 | } | |
754 | break; | |
755 | ||
57cf8043 | 756 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
757 | switch (event) { |
758 | case OPN_RJCT: | |
759 | case CNF_RJCT: | |
54ef656b | 760 | reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); |
c3896d2c LCC |
761 | case CLS_ACPT: |
762 | if (!reason) | |
54ef656b | 763 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 764 | sta->reason = reason; |
57cf8043 | 765 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c LCC |
766 | if (!mod_plink_timer(sta, |
767 | dot11MeshHoldingTimeout(sdata))) | |
768 | sta->ignore_plink_timer = true; | |
769 | ||
770 | llid = sta->llid; | |
07346f81 | 771 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
772 | mesh_plink_frame_tx(sdata, |
773 | WLAN_SP_MESH_PEERING_CLOSE, | |
774 | sta->sta.addr, llid, plid, reason); | |
ff59dc76 | 775 | break; |
c3896d2c | 776 | case OPN_ACPT: |
d0709a65 | 777 | del_timer(&sta->plink_timer); |
57cf8043 | 778 | sta->plink_state = NL80211_PLINK_ESTAB; |
07346f81 | 779 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
780 | mesh_plink_inc_estab_count(sdata); |
781 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
0c68ae26 JB |
782 | mpl_dbg("Mesh plink with %pM ESTABLISHED\n", |
783 | sta->sta.addr); | |
54ef656b TP |
784 | mesh_plink_frame_tx(sdata, |
785 | WLAN_SP_MESH_PEERING_CONFIRM, | |
786 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
787 | break; |
788 | default: | |
07346f81 | 789 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
790 | break; |
791 | } | |
792 | break; | |
793 | ||
57cf8043 | 794 | case NL80211_PLINK_ESTAB: |
c3896d2c LCC |
795 | switch (event) { |
796 | case CLS_ACPT: | |
54ef656b | 797 | reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); |
c3896d2c | 798 | sta->reason = reason; |
c9370197 | 799 | deactivated = __mesh_plink_deactivate(sta); |
57cf8043 | 800 | sta->plink_state = NL80211_PLINK_HOLDING; |
c3896d2c | 801 | llid = sta->llid; |
d0709a65 | 802 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
07346f81 | 803 | spin_unlock_bh(&sta->lock); |
c9370197 JL |
804 | if (deactivated) |
805 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); | |
54ef656b TP |
806 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
807 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
808 | break; |
809 | case OPN_ACPT: | |
810 | llid = sta->llid; | |
07346f81 | 811 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
812 | mesh_plink_frame_tx(sdata, |
813 | WLAN_SP_MESH_PEERING_CONFIRM, | |
814 | sta->sta.addr, llid, plid, 0); | |
c3896d2c LCC |
815 | break; |
816 | default: | |
07346f81 | 817 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
818 | break; |
819 | } | |
820 | break; | |
57cf8043 | 821 | case NL80211_PLINK_HOLDING: |
c3896d2c LCC |
822 | switch (event) { |
823 | case CLS_ACPT: | |
d0709a65 | 824 | if (del_timer(&sta->plink_timer)) |
c3896d2c | 825 | sta->ignore_plink_timer = 1; |
c3896d2c | 826 | mesh_plink_fsm_restart(sta); |
07346f81 | 827 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
828 | break; |
829 | case OPN_ACPT: | |
830 | case CNF_ACPT: | |
831 | case OPN_RJCT: | |
832 | case CNF_RJCT: | |
833 | llid = sta->llid; | |
834 | reason = sta->reason; | |
07346f81 | 835 | spin_unlock_bh(&sta->lock); |
54ef656b TP |
836 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
837 | sta->sta.addr, llid, plid, reason); | |
c3896d2c LCC |
838 | break; |
839 | default: | |
07346f81 | 840 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
841 | } |
842 | break; | |
843 | default: | |
b4e08ea1 | 844 | /* should not get here, PLINK_BLOCKED is dealt with at the |
3ad2f3fb | 845 | * beginning of the function |
c3896d2c | 846 | */ |
07346f81 | 847 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
848 | break; |
849 | } | |
d0709a65 JB |
850 | |
851 | rcu_read_unlock(); | |
c3896d2c | 852 | } |