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c3896d2c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
4abb52a4 | 3 | * Copyright (C) 2019 Intel Corporation |
c3896d2c LCC |
4 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
5a0e3ad6 | 10 | #include <linux/gfp.h> |
902acc78 JB |
11 | #include <linux/kernel.h> |
12 | #include <linux/random.h> | |
b2d09103 IM |
13 | #include <linux/rculist.h> |
14 | ||
c3896d2c | 15 | #include "ieee80211_i.h" |
2c8dccc7 | 16 | #include "rate.h" |
c3896d2c | 17 | #include "mesh.h" |
c3896d2c | 18 | |
a69bd8e6 | 19 | #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2) |
8db09850 TP |
20 | #define PLINK_GET_LLID(p) (p + 2) |
21 | #define PLINK_GET_PLID(p) (p + 4) | |
c3896d2c | 22 | |
433f5bc1 | 23 | #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \ |
cc57ac53 | 24 | jiffies + msecs_to_jiffies(t))) |
c3896d2c | 25 | |
c3896d2c LCC |
26 | enum plink_event { |
27 | PLINK_UNDEFINED, | |
28 | OPN_ACPT, | |
29 | OPN_RJCT, | |
30 | OPN_IGNR, | |
31 | CNF_ACPT, | |
32 | CNF_RJCT, | |
33 | CNF_IGNR, | |
34 | CLS_ACPT, | |
35 | CLS_IGNR | |
36 | }; | |
37 | ||
95e48add TP |
38 | static const char * const mplstates[] = { |
39 | [NL80211_PLINK_LISTEN] = "LISTEN", | |
40 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
41 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
42 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
43 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
44 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
45 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
46 | }; | |
47 | ||
48 | static const char * const mplevents[] = { | |
49 | [PLINK_UNDEFINED] = "NONE", | |
50 | [OPN_ACPT] = "OPN_ACPT", | |
51 | [OPN_RJCT] = "OPN_RJCT", | |
52 | [OPN_IGNR] = "OPN_IGNR", | |
53 | [CNF_ACPT] = "CNF_ACPT", | |
54 | [CNF_RJCT] = "CNF_RJCT", | |
55 | [CNF_IGNR] = "CNF_IGNR", | |
56 | [CLS_ACPT] = "CLS_ACPT", | |
57 | [CLS_IGNR] = "CLS_IGNR" | |
58 | }; | |
59 | ||
36c9bb29 BC |
60 | /* We only need a valid sta if user configured a minimum rssi_threshold. */ |
61 | static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata, | |
62 | struct sta_info *sta) | |
63 | { | |
64 | s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold; | |
65 | return rssi_threshold == 0 || | |
e5a9f8d0 | 66 | (sta && |
0be6ed13 | 67 | (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) > |
e5a9f8d0 | 68 | rssi_threshold); |
36c9bb29 BC |
69 | } |
70 | ||
c3896d2c LCC |
71 | /** |
72 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
73 | * | |
23c7a29c | 74 | * @sta: mesh peer link to restart |
c3896d2c | 75 | * |
433f5bc1 | 76 | * Locking: this function must be called holding sta->mesh->plink_lock |
c3896d2c LCC |
77 | */ |
78 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
79 | { | |
433f5bc1 JB |
80 | lockdep_assert_held(&sta->mesh->plink_lock); |
81 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; | |
82 | sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0; | |
83 | sta->mesh->plink_retries = 0; | |
c3896d2c LCC |
84 | } |
85 | ||
3b144658 TP |
86 | /* |
87 | * mesh_set_short_slot_time - enable / disable ERP short slot time. | |
88 | * | |
89 | * The standard indirectly mandates mesh STAs to turn off short slot time by | |
90 | * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we | |
91 | * can't be sneaky about it. Enable short slot time if all mesh STAs in the | |
92 | * MBSS support ERP rates. | |
93 | * | |
94 | * Returns BSS_CHANGED_ERP_SLOT or 0 for no change. | |
95 | */ | |
96 | static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) | |
97 | { | |
98 | struct ieee80211_local *local = sdata->local; | |
21a8e9dd | 99 | struct ieee80211_supported_band *sband; |
3b144658 TP |
100 | struct sta_info *sta; |
101 | u32 erp_rates = 0, changed = 0; | |
102 | int i; | |
103 | bool short_slot = false; | |
104 | ||
21a8e9dd MSS |
105 | sband = ieee80211_get_sband(sdata); |
106 | if (!sband) | |
107 | return changed; | |
108 | ||
109 | if (sband->band == NL80211_BAND_5GHZ) { | |
3b144658 TP |
110 | /* (IEEE 802.11-2012 19.4.5) */ |
111 | short_slot = true; | |
112 | goto out; | |
21a8e9dd | 113 | } else if (sband->band != NL80211_BAND_2GHZ) { |
3b144658 | 114 | goto out; |
21a8e9dd | 115 | } |
3b144658 TP |
116 | |
117 | for (i = 0; i < sband->n_bitrates; i++) | |
118 | if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) | |
119 | erp_rates |= BIT(i); | |
120 | ||
121 | if (!erp_rates) | |
122 | goto out; | |
123 | ||
124 | rcu_read_lock(); | |
125 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
126 | if (sdata != sta->sdata || | |
433f5bc1 | 127 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
3b144658 TP |
128 | continue; |
129 | ||
130 | short_slot = false; | |
21a8e9dd | 131 | if (erp_rates & sta->sta.supp_rates[sband->band]) |
3b144658 TP |
132 | short_slot = true; |
133 | else | |
134 | break; | |
135 | } | |
136 | rcu_read_unlock(); | |
137 | ||
138 | out: | |
139 | if (sdata->vif.bss_conf.use_short_slot != short_slot) { | |
140 | sdata->vif.bss_conf.use_short_slot = short_slot; | |
141 | changed = BSS_CHANGED_ERP_SLOT; | |
142 | mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", | |
143 | sdata->vif.addr, short_slot); | |
144 | } | |
145 | return changed; | |
146 | } | |
147 | ||
2c53040f | 148 | /** |
cbf9322e | 149 | * mesh_set_ht_prot_mode - set correct HT protection mode |
57aac7c5 | 150 | * |
cbf9322e AN |
151 | * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT |
152 | * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT | |
153 | * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is | |
154 | * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode | |
155 | * is selected if all peers in our 20/40MHz MBSS support HT and atleast one | |
156 | * HT20 peer is present. Otherwise no-protection mode is selected. | |
57aac7c5 AN |
157 | */ |
158 | static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) | |
159 | { | |
160 | struct ieee80211_local *local = sdata->local; | |
161 | struct sta_info *sta; | |
57aac7c5 AN |
162 | u16 ht_opmode; |
163 | bool non_ht_sta = false, ht20_sta = false; | |
164 | ||
0418a445 SW |
165 | switch (sdata->vif.bss_conf.chandef.width) { |
166 | case NL80211_CHAN_WIDTH_20_NOHT: | |
167 | case NL80211_CHAN_WIDTH_5: | |
168 | case NL80211_CHAN_WIDTH_10: | |
57aac7c5 | 169 | return 0; |
0418a445 SW |
170 | default: |
171 | break; | |
172 | } | |
57aac7c5 AN |
173 | |
174 | rcu_read_lock(); | |
175 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
cbf9322e | 176 | if (sdata != sta->sdata || |
433f5bc1 | 177 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
cbf9322e AN |
178 | continue; |
179 | ||
52ac8c48 TP |
180 | if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20) |
181 | continue; | |
182 | ||
183 | if (!sta->sta.ht_cap.ht_supported) { | |
184 | mpl_dbg(sdata, "nonHT sta (%pM) is present\n", | |
185 | sta->sta.addr); | |
cbf9322e | 186 | non_ht_sta = true; |
cbf9322e | 187 | break; |
57aac7c5 | 188 | } |
52ac8c48 TP |
189 | |
190 | mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); | |
191 | ht20_sta = true; | |
57aac7c5 | 192 | } |
57aac7c5 AN |
193 | rcu_read_unlock(); |
194 | ||
195 | if (non_ht_sta) | |
196 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; | |
466f310d | 197 | else if (ht20_sta && |
4bf88530 | 198 | sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) |
57aac7c5 AN |
199 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; |
200 | else | |
201 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; | |
202 | ||
52ac8c48 TP |
203 | if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) |
204 | return 0; | |
57aac7c5 | 205 | |
52ac8c48 TP |
206 | sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
207 | sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; | |
208 | mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); | |
209 | return BSS_CHANGED_HT; | |
57aac7c5 AN |
210 | } |
211 | ||
f698d856 | 212 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
a69bd8e6 | 213 | struct sta_info *sta, |
bf7cd94d | 214 | enum ieee80211_self_protected_actioncode action, |
6f101ef0 | 215 | u8 *da, u16 llid, u16 plid, u16 reason) |
bf7cd94d | 216 | { |
f698d856 | 217 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 218 | struct sk_buff *skb; |
e7570dfb | 219 | struct ieee80211_tx_info *info; |
c3896d2c LCC |
220 | struct ieee80211_mgmt *mgmt; |
221 | bool include_plid = false; | |
8db09850 | 222 | u16 peering_proto = 0; |
3b69a9c5 | 223 | u8 *pos, ie_len = 4; |
4c121fd6 | 224 | int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot); |
f609a43d | 225 | int err = -ENOMEM; |
3b69a9c5 | 226 | |
65e8b0cc | 227 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
228 | hdr_len + |
229 | 2 + /* capability info */ | |
230 | 2 + /* AID */ | |
231 | 2 + 8 + /* supported rates */ | |
232 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
233 | 2 + sdata->u.mesh.mesh_id_len + | |
234 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 235 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 236 | 2 + sizeof(struct ieee80211_ht_operation) + |
c85fb53c BC |
237 | 2 + sizeof(struct ieee80211_vht_cap) + |
238 | 2 + sizeof(struct ieee80211_vht_operation) + | |
3b69a9c5 TP |
239 | 2 + 8 + /* peering IE */ |
240 | sdata->u.mesh.ie_len); | |
c3896d2c | 241 | if (!skb) |
87d84c45 | 242 | return err; |
e7570dfb | 243 | info = IEEE80211_SKB_CB(skb); |
65e8b0cc | 244 | skb_reserve(skb, local->tx_headroom); |
b080db58 | 245 | mgmt = skb_put_zero(skb, hdr_len); |
e7827a70 HH |
246 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
247 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 248 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 249 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 250 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
251 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
252 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 253 | |
8db09850 | 254 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
21a8e9dd MSS |
255 | struct ieee80211_supported_band *sband; |
256 | enum nl80211_band band; | |
257 | ||
258 | sband = ieee80211_get_sband(sdata); | |
259 | if (!sband) { | |
260 | err = -EINVAL; | |
261 | goto free; | |
262 | } | |
263 | band = sband->band; | |
55de908a | 264 | |
8db09850 | 265 | /* capability info */ |
e45a79da | 266 | pos = skb_put_zero(skb, 2); |
54ef656b | 267 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
268 | /* AID */ |
269 | pos = skb_put(skb, 2); | |
a69bd8e6 | 270 | put_unaligned_le16(sta->sta.aid, pos); |
c3896d2c | 271 | } |
55de908a JB |
272 | if (ieee80211_add_srates_ie(sdata, skb, true, band) || |
273 | ieee80211_add_ext_srates_ie(sdata, skb, true, band) || | |
bf7cd94d JB |
274 | mesh_add_rsn_ie(sdata, skb) || |
275 | mesh_add_meshid_ie(sdata, skb) || | |
276 | mesh_add_meshconf_ie(sdata, skb)) | |
f609a43d | 277 | goto free; |
8db09850 | 278 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
e7570dfb | 279 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
bf7cd94d | 280 | if (mesh_add_meshid_ie(sdata, skb)) |
f609a43d | 281 | goto free; |
c3896d2c LCC |
282 | } |
283 | ||
8db09850 | 284 | /* Add Mesh Peering Management element */ |
c3896d2c | 285 | switch (action) { |
54ef656b | 286 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 287 | break; |
54ef656b | 288 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 289 | ie_len += 2; |
c3896d2c LCC |
290 | include_plid = true; |
291 | break; | |
54ef656b | 292 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
293 | if (plid) { |
294 | ie_len += 2; | |
c3896d2c LCC |
295 | include_plid = true; |
296 | } | |
8db09850 | 297 | ie_len += 2; /* reason code */ |
c3896d2c | 298 | break; |
8db09850 | 299 | default: |
f609a43d TP |
300 | err = -EINVAL; |
301 | goto free; | |
c3896d2c LCC |
302 | } |
303 | ||
8db09850 | 304 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
f609a43d | 305 | goto free; |
8db09850 | 306 | |
c3896d2c | 307 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 308 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 309 | *pos++ = ie_len; |
8db09850 TP |
310 | memcpy(pos, &peering_proto, 2); |
311 | pos += 2; | |
6f101ef0 | 312 | put_unaligned_le16(llid, pos); |
8db09850 | 313 | pos += 2; |
c3896d2c | 314 | if (include_plid) { |
6f101ef0 | 315 | put_unaligned_le16(plid, pos); |
8db09850 | 316 | pos += 2; |
c3896d2c | 317 | } |
54ef656b | 318 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
6f101ef0 | 319 | put_unaligned_le16(reason, pos); |
8db09850 | 320 | pos += 2; |
c3896d2c | 321 | } |
176f3608 TP |
322 | |
323 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
bf7cd94d | 324 | if (mesh_add_ht_cap_ie(sdata, skb) || |
c85fb53c BC |
325 | mesh_add_ht_oper_ie(sdata, skb) || |
326 | mesh_add_vht_cap_ie(sdata, skb) || | |
327 | mesh_add_vht_oper_ie(sdata, skb)) | |
f609a43d | 328 | goto free; |
176f3608 TP |
329 | } |
330 | ||
bf7cd94d | 331 | if (mesh_add_vendor_ies(sdata, skb)) |
f609a43d | 332 | goto free; |
c3896d2c | 333 | |
62ae67be | 334 | ieee80211_tx_skb(sdata, skb); |
c3896d2c | 335 | return 0; |
f609a43d TP |
336 | free: |
337 | kfree_skb(skb); | |
338 | return err; | |
c3896d2c LCC |
339 | } |
340 | ||
fa87a656 BC |
341 | /** |
342 | * __mesh_plink_deactivate - deactivate mesh peer link | |
343 | * | |
344 | * @sta: mesh peer link to deactivate | |
345 | * | |
e596af82 BC |
346 | * Mesh paths with this peer as next hop should be flushed |
347 | * by the caller outside of plink_lock. | |
348 | * | |
fa87a656 BC |
349 | * Returns beacon changed flag if the beacon content changed. |
350 | * | |
351 | * Locking: the caller must hold sta->mesh->plink_lock | |
352 | */ | |
353 | static u32 __mesh_plink_deactivate(struct sta_info *sta) | |
354 | { | |
355 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
356 | u32 changed = 0; | |
357 | ||
358 | lockdep_assert_held(&sta->mesh->plink_lock); | |
359 | ||
360 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) | |
361 | changed = mesh_plink_dec_estab_count(sdata); | |
362 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; | |
fa87a656 BC |
363 | |
364 | ieee80211_mps_sta_status_update(sta); | |
365 | changed |= ieee80211_mps_set_sta_local_pm(sta, | |
366 | NL80211_MESH_POWER_UNKNOWN); | |
367 | ||
368 | return changed; | |
369 | } | |
370 | ||
371 | /** | |
372 | * mesh_plink_deactivate - deactivate mesh peer link | |
373 | * | |
374 | * @sta: mesh peer link to deactivate | |
375 | * | |
376 | * All mesh paths with this peer as next hop will be flushed | |
377 | */ | |
378 | u32 mesh_plink_deactivate(struct sta_info *sta) | |
379 | { | |
380 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
381 | u32 changed; | |
382 | ||
383 | spin_lock_bh(&sta->mesh->plink_lock); | |
384 | changed = __mesh_plink_deactivate(sta); | |
efc401f4 BC |
385 | |
386 | if (!sdata->u.mesh.user_mpm) { | |
387 | sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; | |
388 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, | |
389 | sta->sta.addr, sta->mesh->llid, | |
390 | sta->mesh->plid, sta->mesh->reason); | |
391 | } | |
fa87a656 | 392 | spin_unlock_bh(&sta->mesh->plink_lock); |
efc401f4 BC |
393 | if (!sdata->u.mesh.user_mpm) |
394 | del_timer_sync(&sta->mesh->plink_timer); | |
e596af82 | 395 | mesh_path_flush_by_nexthop(sta); |
fa87a656 | 396 | |
efc401f4 BC |
397 | /* make sure no readers can access nexthop sta from here on */ |
398 | synchronize_net(); | |
399 | ||
fa87a656 BC |
400 | return changed; |
401 | } | |
402 | ||
296fcba3 TP |
403 | static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
404 | struct sta_info *sta, | |
1d6741d8 | 405 | struct ieee802_11_elems *elems) |
c3896d2c | 406 | { |
f698d856 | 407 | struct ieee80211_local *local = sdata->local; |
54ab1ffb | 408 | struct ieee80211_supported_band *sband; |
f68d776a | 409 | u32 rates, basic_rates = 0, changed = 0; |
abcff6ef | 410 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
c3896d2c | 411 | |
21a8e9dd MSS |
412 | sband = ieee80211_get_sband(sdata); |
413 | if (!sband) | |
414 | return; | |
415 | ||
416 | rates = ieee80211_sta_get_rates(sdata, elems, sband->band, | |
417 | &basic_rates); | |
d0709a65 | 418 | |
433f5bc1 | 419 | spin_lock_bh(&sta->mesh->plink_lock); |
e5a9f8d0 | 420 | sta->rx_stats.last_rx = jiffies; |
296fcba3 TP |
421 | |
422 | /* rates and capabilities don't change during peering */ | |
433f5bc1 JB |
423 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
424 | sta->mesh->processed_beacon) | |
296fcba3 | 425 | goto out; |
433f5bc1 | 426 | sta->mesh->processed_beacon = true; |
bae35d92 | 427 | |
21a8e9dd | 428 | if (sta->sta.supp_rates[sband->band] != rates) |
f68d776a | 429 | changed |= IEEE80211_RC_SUPP_RATES_CHANGED; |
21a8e9dd | 430 | sta->sta.supp_rates[sband->band] = rates; |
54ab1ffb | 431 | |
52ac8c48 TP |
432 | if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
433 | elems->ht_cap_elem, sta)) | |
434 | changed |= IEEE80211_RC_BW_CHANGED; | |
4bf88530 | 435 | |
c85fb53c BC |
436 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
437 | elems->vht_cap_elem, sta); | |
438 | ||
abcff6ef JD |
439 | if (bw != sta->sta.bandwidth) |
440 | changed |= IEEE80211_RC_BW_CHANGED; | |
441 | ||
52ac8c48 TP |
442 | /* HT peer is operating 20MHz-only */ |
443 | if (elems->ht_operation && | |
444 | !(elems->ht_operation->ht_param & | |
445 | IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
446 | if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) | |
f68d776a | 447 | changed |= IEEE80211_RC_BW_CHANGED; |
52ac8c48 | 448 | sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; |
57aac7c5 | 449 | } |
c7d25828 | 450 | |
1d6741d8 | 451 | if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) |
59cf1d65 | 452 | rate_control_rate_init(sta); |
f68d776a TP |
453 | else |
454 | rate_control_rate_update(local, sband, sta, changed); | |
296fcba3 | 455 | out: |
433f5bc1 | 456 | spin_unlock_bh(&sta->mesh->plink_lock); |
296fcba3 TP |
457 | } |
458 | ||
0e0060fc BC |
459 | static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) |
460 | { | |
461 | struct sta_info *sta; | |
462 | unsigned long *aid_map; | |
463 | int aid; | |
464 | ||
465 | aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1), | |
466 | sizeof(*aid_map), GFP_KERNEL); | |
467 | if (!aid_map) | |
468 | return -ENOMEM; | |
469 | ||
470 | /* reserve aid 0 for mcast indication */ | |
471 | __set_bit(0, aid_map); | |
472 | ||
473 | rcu_read_lock(); | |
474 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) | |
475 | __set_bit(sta->sta.aid, aid_map); | |
476 | rcu_read_unlock(); | |
477 | ||
478 | aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); | |
479 | kfree(aid_map); | |
480 | ||
481 | if (aid > IEEE80211_MAX_AID) | |
482 | return -ENOBUFS; | |
483 | ||
484 | return aid; | |
485 | } | |
486 | ||
296fcba3 TP |
487 | static struct sta_info * |
488 | __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) | |
489 | { | |
490 | struct sta_info *sta; | |
0e0060fc | 491 | int aid; |
54ab1ffb | 492 | |
296fcba3 | 493 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
e87278e7 TP |
494 | return NULL; |
495 | ||
0e0060fc BC |
496 | aid = mesh_allocate_aid(sdata); |
497 | if (aid < 0) | |
498 | return NULL; | |
499 | ||
296fcba3 TP |
500 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
501 | if (!sta) | |
502 | return NULL; | |
503 | ||
433f5bc1 | 504 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
a74a8c84 | 505 | sta->sta.wme = true; |
0e0060fc | 506 | sta->sta.aid = aid; |
296fcba3 TP |
507 | |
508 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); | |
509 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
510 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
511 | ||
296fcba3 TP |
512 | return sta; |
513 | } | |
514 | ||
515 | static struct sta_info * | |
516 | mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, | |
ecbc12ad BC |
517 | struct ieee802_11_elems *elems, |
518 | struct ieee80211_rx_status *rx_status) | |
296fcba3 TP |
519 | { |
520 | struct sta_info *sta = NULL; | |
521 | ||
a6dad6a2 TP |
522 | /* Userspace handles station allocation */ |
523 | if (sdata->u.mesh.user_mpm || | |
11197d00 MH |
524 | sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { |
525 | if (mesh_peer_accepts_plinks(elems) && | |
ecbc12ad BC |
526 | mesh_plink_availables(sdata)) { |
527 | int sig = 0; | |
528 | ||
529 | if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM)) | |
530 | sig = rx_status->signal; | |
531 | ||
11197d00 MH |
532 | cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
533 | elems->ie_start, | |
534 | elems->total_len, | |
ecbc12ad BC |
535 | sig, GFP_KERNEL); |
536 | } | |
11197d00 | 537 | } else |
296fcba3 TP |
538 | sta = __mesh_sta_info_alloc(sdata, addr); |
539 | ||
54ab1ffb TP |
540 | return sta; |
541 | } | |
542 | ||
296fcba3 TP |
543 | /* |
544 | * mesh_sta_info_get - return mesh sta info entry for @addr. | |
545 | * | |
546 | * @sdata: local meshif | |
547 | * @addr: peer's address | |
548 | * @elems: IEs from beacon or mesh peering frame. | |
ecbc12ad | 549 | * @rx_status: rx status for the frame for signal reporting |
296fcba3 TP |
550 | * |
551 | * Return existing or newly allocated sta_info under RCU read lock. | |
552 | * (re)initialize with given IEs. | |
553 | */ | |
554 | static struct sta_info * | |
555 | mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, | |
ecbc12ad BC |
556 | u8 *addr, struct ieee802_11_elems *elems, |
557 | struct ieee80211_rx_status *rx_status) __acquires(RCU) | |
296fcba3 TP |
558 | { |
559 | struct sta_info *sta = NULL; | |
560 | ||
561 | rcu_read_lock(); | |
562 | sta = sta_info_get(sdata, addr); | |
563 | if (sta) { | |
1d6741d8 | 564 | mesh_sta_info_init(sdata, sta, elems); |
296fcba3 TP |
565 | } else { |
566 | rcu_read_unlock(); | |
567 | /* can't run atomic */ | |
ecbc12ad | 568 | sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status); |
296fcba3 TP |
569 | if (!sta) { |
570 | rcu_read_lock(); | |
571 | return NULL; | |
572 | } | |
573 | ||
1d6741d8 | 574 | mesh_sta_info_init(sdata, sta, elems); |
3b4797bc | 575 | |
296fcba3 TP |
576 | if (sta_info_insert_rcu(sta)) |
577 | return NULL; | |
578 | } | |
579 | ||
580 | return sta; | |
581 | } | |
582 | ||
583 | /* | |
584 | * mesh_neighbour_update - update or initialize new mesh neighbor. | |
585 | * | |
586 | * @sdata: local meshif | |
587 | * @addr: peer's address | |
588 | * @elems: IEs from beacon or mesh peering frame | |
ecbc12ad | 589 | * @rx_status: rx status for the frame for signal reporting |
296fcba3 TP |
590 | * |
591 | * Initiates peering if appropriate. | |
592 | */ | |
f743ff49 TP |
593 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
594 | u8 *hw_addr, | |
ecbc12ad BC |
595 | struct ieee802_11_elems *elems, |
596 | struct ieee80211_rx_status *rx_status) | |
54ab1ffb TP |
597 | { |
598 | struct sta_info *sta; | |
39886b61 | 599 | u32 changed = 0; |
54ab1ffb | 600 | |
ecbc12ad | 601 | sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status); |
54ab1ffb TP |
602 | if (!sta) |
603 | goto out; | |
604 | ||
dbdaee7a BC |
605 | sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form & |
606 | IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE; | |
607 | ||
1570ca59 | 608 | if (mesh_peer_accepts_plinks(elems) && |
433f5bc1 | 609 | sta->mesh->plink_state == NL80211_PLINK_LISTEN && |
54ab1ffb TP |
610 | sdata->u.mesh.accepting_plinks && |
611 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
36c9bb29 | 612 | rssi_threshold_check(sdata, sta)) |
39886b61 | 613 | changed = mesh_plink_open(sta); |
c3896d2c | 614 | |
3f52b7e3 | 615 | ieee80211_mps_frame_release(sta, elems); |
54ab1ffb | 616 | out: |
d0709a65 | 617 | rcu_read_unlock(); |
2b5e1967 | 618 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c LCC |
619 | } |
620 | ||
4c02d62f | 621 | void mesh_plink_timer(struct timer_list *t) |
c3896d2c | 622 | { |
4c02d62f | 623 | struct mesh_sta *mesh = from_timer(mesh, t, plink_timer); |
c3896d2c | 624 | struct sta_info *sta; |
6f101ef0 | 625 | u16 reason = 0; |
c3896d2c | 626 | struct ieee80211_sub_if_data *sdata; |
453e66f2 | 627 | struct mesh_config *mshcfg; |
4efec451 | 628 | enum ieee80211_self_protected_actioncode action = 0; |
c3896d2c | 629 | |
d0709a65 JB |
630 | /* |
631 | * This STA is valid because sta_info_destroy() will | |
632 | * del_timer_sync() this timer after having made sure | |
633 | * it cannot be readded (by deleting the plink.) | |
634 | */ | |
4c02d62f | 635 | sta = mesh->plink_sta; |
c3896d2c | 636 | |
690205f1 | 637 | if (sta->sdata->local->quiescing) |
5bb644a0 | 638 | return; |
5bb644a0 | 639 | |
433f5bc1 | 640 | spin_lock_bh(&sta->mesh->plink_lock); |
2b470c39 BC |
641 | |
642 | /* If a timer fires just before a state transition on another CPU, | |
643 | * we may have already extended the timeout and changed state by the | |
644 | * time we've acquired the lock and arrived here. In that case, | |
645 | * skip this timer and wait for the new one. | |
646 | */ | |
433f5bc1 | 647 | if (time_before(jiffies, sta->mesh->plink_timer.expires)) { |
2b470c39 BC |
648 | mpl_dbg(sta->sdata, |
649 | "Ignoring timer for %pM in state %s (timer adjusted)", | |
433f5bc1 JB |
650 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
651 | spin_unlock_bh(&sta->mesh->plink_lock); | |
c3896d2c LCC |
652 | return; |
653 | } | |
2b470c39 BC |
654 | |
655 | /* del_timer() and handler may race when entering these states */ | |
433f5bc1 JB |
656 | if (sta->mesh->plink_state == NL80211_PLINK_LISTEN || |
657 | sta->mesh->plink_state == NL80211_PLINK_ESTAB) { | |
2b470c39 BC |
658 | mpl_dbg(sta->sdata, |
659 | "Ignoring timer for %pM in state %s (timer deleted)", | |
433f5bc1 JB |
660 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
661 | spin_unlock_bh(&sta->mesh->plink_lock); | |
2b470c39 BC |
662 | return; |
663 | } | |
664 | ||
bdcbd8e0 | 665 | mpl_dbg(sta->sdata, |
3088f7d2 | 666 | "Mesh plink timer for %pM fired on state %s\n", |
433f5bc1 | 667 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
d0709a65 | 668 | sdata = sta->sdata; |
453e66f2 | 669 | mshcfg = &sdata->u.mesh.mshcfg; |
c3896d2c | 670 | |
433f5bc1 | 671 | switch (sta->mesh->plink_state) { |
57cf8043 JC |
672 | case NL80211_PLINK_OPN_RCVD: |
673 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c | 674 | /* retry timer */ |
433f5bc1 | 675 | if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) { |
c3896d2c | 676 | u32 rand; |
bdcbd8e0 JB |
677 | mpl_dbg(sta->sdata, |
678 | "Mesh plink for %pM (retry, timeout): %d %d\n", | |
433f5bc1 JB |
679 | sta->sta.addr, sta->mesh->plink_retries, |
680 | sta->mesh->plink_timeout); | |
c3896d2c | 681 | get_random_bytes(&rand, sizeof(u32)); |
433f5bc1 JB |
682 | sta->mesh->plink_timeout = sta->mesh->plink_timeout + |
683 | rand % sta->mesh->plink_timeout; | |
684 | ++sta->mesh->plink_retries; | |
685 | mod_plink_timer(sta, sta->mesh->plink_timeout); | |
4efec451 | 686 | action = WLAN_SP_MESH_PEERING_OPEN; |
c3896d2c LCC |
687 | break; |
688 | } | |
6f101ef0 | 689 | reason = WLAN_REASON_MESH_MAX_RETRIES; |
02049ce2 | 690 | /* fall through */ |
57cf8043 | 691 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
692 | /* confirm timer */ |
693 | if (!reason) | |
6f101ef0 | 694 | reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; |
433f5bc1 | 695 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; |
453e66f2 | 696 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
4efec451 | 697 | action = WLAN_SP_MESH_PEERING_CLOSE; |
c3896d2c | 698 | break; |
57cf8043 | 699 | case NL80211_PLINK_HOLDING: |
c3896d2c | 700 | /* holding timer */ |
433f5bc1 | 701 | del_timer(&sta->mesh->plink_timer); |
c3896d2c | 702 | mesh_plink_fsm_restart(sta); |
c3896d2c LCC |
703 | break; |
704 | default: | |
c3896d2c LCC |
705 | break; |
706 | } | |
433f5bc1 | 707 | spin_unlock_bh(&sta->mesh->plink_lock); |
4efec451 | 708 | if (action) |
a69bd8e6 | 709 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 | 710 | sta->mesh->llid, sta->mesh->plid, reason); |
c3896d2c LCC |
711 | } |
712 | ||
0df2f6c1 | 713 | static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
c3896d2c | 714 | { |
433f5bc1 | 715 | sta->mesh->plink_timeout = timeout; |
4c02d62f | 716 | mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout)); |
c3896d2c LCC |
717 | } |
718 | ||
204d1304 | 719 | static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
6f101ef0 | 720 | u16 llid) |
204d1304 TP |
721 | { |
722 | struct ieee80211_local *local = sdata->local; | |
723 | bool in_use = false; | |
724 | struct sta_info *sta; | |
725 | ||
726 | rcu_read_lock(); | |
727 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
520c75dc MS |
728 | if (sdata != sta->sdata) |
729 | continue; | |
730 | ||
433f5bc1 | 731 | if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) { |
204d1304 TP |
732 | in_use = true; |
733 | break; | |
734 | } | |
735 | } | |
736 | rcu_read_unlock(); | |
737 | ||
738 | return in_use; | |
739 | } | |
740 | ||
6f101ef0 | 741 | static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
204d1304 TP |
742 | { |
743 | u16 llid; | |
744 | ||
745 | do { | |
746 | get_random_bytes(&llid, sizeof(llid)); | |
6f101ef0 | 747 | } while (llid_in_use(sdata, llid)); |
204d1304 | 748 | |
6f101ef0 | 749 | return llid; |
204d1304 TP |
750 | } |
751 | ||
39886b61 | 752 | u32 mesh_plink_open(struct sta_info *sta) |
c3896d2c | 753 | { |
d0709a65 | 754 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
39886b61 | 755 | u32 changed; |
c3896d2c | 756 | |
c2c98fde | 757 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
39886b61 | 758 | return 0; |
53e80511 | 759 | |
433f5bc1 JB |
760 | spin_lock_bh(&sta->mesh->plink_lock); |
761 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
762 | if (sta->mesh->plink_state != NL80211_PLINK_LISTEN && | |
763 | sta->mesh->plink_state != NL80211_PLINK_BLOCKED) { | |
764 | spin_unlock_bh(&sta->mesh->plink_lock); | |
39886b61 | 765 | return 0; |
c3896d2c | 766 | } |
433f5bc1 | 767 | sta->mesh->plink_state = NL80211_PLINK_OPN_SNT; |
453e66f2 | 768 | mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
433f5bc1 | 769 | spin_unlock_bh(&sta->mesh->plink_lock); |
bdcbd8e0 JB |
770 | mpl_dbg(sdata, |
771 | "Mesh plink: starting establishment with %pM\n", | |
0c68ae26 | 772 | sta->sta.addr); |
c3896d2c | 773 | |
3f52b7e3 | 774 | /* set the non-peer mode to active during peering */ |
39886b61 | 775 | changed = ieee80211_mps_local_status_update(sdata); |
3f52b7e3 | 776 | |
a69bd8e6 | 777 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN, |
433f5bc1 | 778 | sta->sta.addr, sta->mesh->llid, 0, 0); |
39886b61 | 779 | return changed; |
c3896d2c LCC |
780 | } |
781 | ||
39886b61 | 782 | u32 mesh_plink_block(struct sta_info *sta) |
c3896d2c | 783 | { |
df323818 | 784 | u32 changed; |
c9370197 | 785 | |
433f5bc1 | 786 | spin_lock_bh(&sta->mesh->plink_lock); |
df323818 | 787 | changed = __mesh_plink_deactivate(sta); |
433f5bc1 JB |
788 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
789 | spin_unlock_bh(&sta->mesh->plink_lock); | |
e596af82 | 790 | mesh_path_flush_by_nexthop(sta); |
c9370197 | 791 | |
39886b61 | 792 | return changed; |
c3896d2c LCC |
793 | } |
794 | ||
e76d67f0 BC |
795 | static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
796 | struct sta_info *sta, | |
797 | enum plink_event event) | |
798 | { | |
799 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
6f101ef0 CYY |
800 | u16 reason = (event == CLS_ACPT) ? |
801 | WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; | |
e76d67f0 | 802 | |
433f5bc1 JB |
803 | sta->mesh->reason = reason; |
804 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; | |
272a9e26 | 805 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
e76d67f0 BC |
806 | } |
807 | ||
808 | static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, | |
809 | struct sta_info *sta) | |
810 | { | |
811 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
812 | u32 changed = 0; | |
813 | ||
433f5bc1 JB |
814 | del_timer(&sta->mesh->plink_timer); |
815 | sta->mesh->plink_state = NL80211_PLINK_ESTAB; | |
e76d67f0 BC |
816 | changed |= mesh_plink_inc_estab_count(sdata); |
817 | changed |= mesh_set_ht_prot_mode(sdata); | |
818 | changed |= mesh_set_short_slot_time(sdata); | |
819 | mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); | |
820 | ieee80211_mps_sta_status_update(sta); | |
821 | changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); | |
822 | return changed; | |
823 | } | |
824 | ||
c7e67811 TP |
825 | /** |
826 | * mesh_plink_fsm - step @sta MPM based on @event | |
827 | * | |
828 | * @sdata: interface | |
829 | * @sta: mesh neighbor | |
830 | * @event: peering event | |
831 | * | |
832 | * Return: changed MBSS flags | |
833 | */ | |
834 | static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, | |
835 | struct sta_info *sta, enum plink_event event) | |
836 | { | |
837 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
838 | enum ieee80211_self_protected_actioncode action = 0; | |
839 | u32 changed = 0; | |
e596af82 | 840 | bool flush = false; |
c7e67811 TP |
841 | |
842 | mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, | |
433f5bc1 | 843 | mplstates[sta->mesh->plink_state], mplevents[event]); |
c7e67811 | 844 | |
433f5bc1 JB |
845 | spin_lock_bh(&sta->mesh->plink_lock); |
846 | switch (sta->mesh->plink_state) { | |
c7e67811 TP |
847 | case NL80211_PLINK_LISTEN: |
848 | switch (event) { | |
849 | case CLS_ACPT: | |
850 | mesh_plink_fsm_restart(sta); | |
851 | break; | |
852 | case OPN_ACPT: | |
433f5bc1 JB |
853 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
854 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
c7e67811 TP |
855 | mesh_plink_timer_set(sta, |
856 | mshcfg->dot11MeshRetryTimeout); | |
857 | ||
858 | /* set the non-peer mode to active during peering */ | |
859 | changed |= ieee80211_mps_local_status_update(sdata); | |
860 | action = WLAN_SP_MESH_PEERING_OPEN; | |
861 | break; | |
862 | default: | |
863 | break; | |
864 | } | |
865 | break; | |
866 | case NL80211_PLINK_OPN_SNT: | |
867 | switch (event) { | |
868 | case OPN_RJCT: | |
869 | case CNF_RJCT: | |
870 | case CLS_ACPT: | |
871 | mesh_plink_close(sdata, sta, event); | |
872 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
873 | break; | |
874 | case OPN_ACPT: | |
875 | /* retry timer is left untouched */ | |
433f5bc1 | 876 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
c7e67811 TP |
877 | action = WLAN_SP_MESH_PEERING_CONFIRM; |
878 | break; | |
879 | case CNF_ACPT: | |
433f5bc1 | 880 | sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD; |
2b470c39 | 881 | mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
c7e67811 TP |
882 | break; |
883 | default: | |
884 | break; | |
885 | } | |
886 | break; | |
887 | case NL80211_PLINK_OPN_RCVD: | |
888 | switch (event) { | |
889 | case OPN_RJCT: | |
890 | case CNF_RJCT: | |
891 | case CLS_ACPT: | |
892 | mesh_plink_close(sdata, sta, event); | |
893 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
894 | break; | |
895 | case OPN_ACPT: | |
896 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
897 | break; | |
898 | case CNF_ACPT: | |
899 | changed |= mesh_plink_establish(sdata, sta); | |
900 | break; | |
901 | default: | |
902 | break; | |
903 | } | |
904 | break; | |
905 | case NL80211_PLINK_CNF_RCVD: | |
906 | switch (event) { | |
907 | case OPN_RJCT: | |
908 | case CNF_RJCT: | |
909 | case CLS_ACPT: | |
910 | mesh_plink_close(sdata, sta, event); | |
911 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
912 | break; | |
913 | case OPN_ACPT: | |
914 | changed |= mesh_plink_establish(sdata, sta); | |
915 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
916 | break; | |
917 | default: | |
918 | break; | |
919 | } | |
920 | break; | |
921 | case NL80211_PLINK_ESTAB: | |
922 | switch (event) { | |
923 | case CLS_ACPT: | |
924 | changed |= __mesh_plink_deactivate(sta); | |
925 | changed |= mesh_set_ht_prot_mode(sdata); | |
926 | changed |= mesh_set_short_slot_time(sdata); | |
927 | mesh_plink_close(sdata, sta, event); | |
928 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
e596af82 | 929 | flush = true; |
c7e67811 TP |
930 | break; |
931 | case OPN_ACPT: | |
932 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
933 | break; | |
934 | default: | |
935 | break; | |
936 | } | |
937 | break; | |
938 | case NL80211_PLINK_HOLDING: | |
939 | switch (event) { | |
940 | case CLS_ACPT: | |
433f5bc1 | 941 | del_timer(&sta->mesh->plink_timer); |
c7e67811 TP |
942 | mesh_plink_fsm_restart(sta); |
943 | break; | |
944 | case OPN_ACPT: | |
945 | case CNF_ACPT: | |
946 | case OPN_RJCT: | |
947 | case CNF_RJCT: | |
948 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
949 | break; | |
950 | default: | |
951 | break; | |
952 | } | |
953 | break; | |
954 | default: | |
955 | /* should not get here, PLINK_BLOCKED is dealt with at the | |
956 | * beginning of the function | |
957 | */ | |
958 | break; | |
959 | } | |
433f5bc1 | 960 | spin_unlock_bh(&sta->mesh->plink_lock); |
e596af82 BC |
961 | if (flush) |
962 | mesh_path_flush_by_nexthop(sta); | |
c7e67811 | 963 | if (action) { |
a69bd8e6 | 964 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 JB |
965 | sta->mesh->llid, sta->mesh->plid, |
966 | sta->mesh->reason); | |
c7e67811 TP |
967 | |
968 | /* also send confirm in open case */ | |
969 | if (action == WLAN_SP_MESH_PEERING_OPEN) { | |
a69bd8e6 | 970 | mesh_plink_frame_tx(sdata, sta, |
c7e67811 | 971 | WLAN_SP_MESH_PEERING_CONFIRM, |
433f5bc1 JB |
972 | sta->sta.addr, sta->mesh->llid, |
973 | sta->mesh->plid, 0); | |
c7e67811 TP |
974 | } |
975 | } | |
976 | ||
977 | return changed; | |
978 | } | |
979 | ||
c99a89ed TP |
980 | /* |
981 | * mesh_plink_get_event - get correct MPM event | |
982 | * | |
983 | * @sdata: interface | |
984 | * @sta: peer, leave NULL if processing a frame from a new suitable peer | |
985 | * @elems: peering management IEs | |
986 | * @ftype: frame type | |
987 | * @llid: peer's peer link ID | |
988 | * @plid: peer's local link ID | |
989 | * | |
990 | * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as | |
991 | * an error. | |
992 | */ | |
993 | static enum plink_event | |
994 | mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, | |
995 | struct sta_info *sta, | |
996 | struct ieee802_11_elems *elems, | |
997 | enum ieee80211_self_protected_actioncode ftype, | |
6f101ef0 | 998 | u16 llid, u16 plid) |
c99a89ed TP |
999 | { |
1000 | enum plink_event event = PLINK_UNDEFINED; | |
1001 | u8 ie_len = elems->peering_len; | |
1002 | bool matches_local; | |
1003 | ||
1004 | matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || | |
1005 | mesh_matches_local(sdata, elems)); | |
1006 | ||
1007 | /* deny open request from non-matching peer */ | |
1008 | if (!matches_local && !sta) { | |
1009 | event = OPN_RJCT; | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | if (!sta) { | |
1014 | if (ftype != WLAN_SP_MESH_PEERING_OPEN) { | |
1015 | mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); | |
1016 | goto out; | |
1017 | } | |
1018 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ | |
1019 | if (!mesh_plink_free_count(sdata)) { | |
1020 | mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); | |
1021 | goto out; | |
1022 | } | |
b8631c00 SS |
1023 | |
1024 | /* new matching peer */ | |
1025 | event = OPN_ACPT; | |
1026 | goto out; | |
c99a89ed TP |
1027 | } else { |
1028 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) { | |
1029 | mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); | |
1030 | goto out; | |
1031 | } | |
433f5bc1 | 1032 | if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED) |
c99a89ed TP |
1033 | goto out; |
1034 | } | |
1035 | ||
c99a89ed TP |
1036 | switch (ftype) { |
1037 | case WLAN_SP_MESH_PEERING_OPEN: | |
1038 | if (!matches_local) | |
1039 | event = OPN_RJCT; | |
1040 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 | 1041 | (sta->mesh->plid && sta->mesh->plid != plid)) |
c99a89ed TP |
1042 | event = OPN_IGNR; |
1043 | else | |
1044 | event = OPN_ACPT; | |
1045 | break; | |
1046 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
1047 | if (!matches_local) | |
1048 | event = CNF_RJCT; | |
1049 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 JB |
1050 | sta->mesh->llid != llid || |
1051 | (sta->mesh->plid && sta->mesh->plid != plid)) | |
c99a89ed TP |
1052 | event = CNF_IGNR; |
1053 | else | |
1054 | event = CNF_ACPT; | |
1055 | break; | |
1056 | case WLAN_SP_MESH_PEERING_CLOSE: | |
433f5bc1 | 1057 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
c99a89ed TP |
1058 | /* Do not check for llid or plid. This does not |
1059 | * follow the standard but since multiple plinks | |
1060 | * per sta are not supported, it is necessary in | |
1061 | * order to avoid a livelock when MP A sees an | |
1062 | * establish peer link to MP B but MP B does not | |
1063 | * see it. This can be caused by a timeout in | |
1064 | * B's peer link establishment or B beign | |
1065 | * restarted. | |
1066 | */ | |
1067 | event = CLS_ACPT; | |
433f5bc1 | 1068 | else if (sta->mesh->plid != plid) |
c99a89ed | 1069 | event = CLS_IGNR; |
433f5bc1 | 1070 | else if (ie_len == 8 && sta->mesh->llid != llid) |
c99a89ed TP |
1071 | event = CLS_IGNR; |
1072 | else | |
1073 | event = CLS_ACPT; | |
1074 | break; | |
1075 | default: | |
1076 | mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | out: | |
1081 | return event; | |
1082 | } | |
1083 | ||
05a23ae9 TP |
1084 | static void |
1085 | mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1086 | struct ieee80211_mgmt *mgmt, | |
ecbc12ad BC |
1087 | struct ieee802_11_elems *elems, |
1088 | struct ieee80211_rx_status *rx_status) | |
c3896d2c | 1089 | { |
05a23ae9 | 1090 | |
c3896d2c LCC |
1091 | struct sta_info *sta; |
1092 | enum plink_event event; | |
54ef656b | 1093 | enum ieee80211_self_protected_actioncode ftype; |
57aac7c5 | 1094 | u32 changed = 0; |
c99a89ed | 1095 | u8 ie_len = elems->peering_len; |
6f101ef0 | 1096 | u16 plid, llid = 0; |
c3896d2c | 1097 | |
05a23ae9 | 1098 | if (!elems->peering) { |
bdcbd8e0 JB |
1099 | mpl_dbg(sdata, |
1100 | "Mesh plink: missing necessary peer link ie\n"); | |
c3896d2c LCC |
1101 | return; |
1102 | } | |
bf7cd94d | 1103 | |
05a23ae9 | 1104 | if (elems->rsn_len && |
bf7cd94d | 1105 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
bdcbd8e0 JB |
1106 | mpl_dbg(sdata, |
1107 | "Mesh plink: can't establish link with secure peer\n"); | |
5cff5e01 JC |
1108 | return; |
1109 | } | |
c3896d2c | 1110 | |
8db09850 | 1111 | ftype = mgmt->u.action.u.self_prot.action_code; |
8db09850 TP |
1112 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
1113 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
1114 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
1115 | && ie_len != 8)) { | |
bdcbd8e0 JB |
1116 | mpl_dbg(sdata, |
1117 | "Mesh plink: incorrect plink ie length %d %d\n", | |
1118 | ftype, ie_len); | |
c3896d2c LCC |
1119 | return; |
1120 | } | |
1121 | ||
54ef656b | 1122 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
05a23ae9 | 1123 | (!elems->mesh_id || !elems->mesh_config)) { |
bdcbd8e0 | 1124 | mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
c3896d2c LCC |
1125 | return; |
1126 | } | |
1127 | /* Note the lines below are correct, the llid in the frame is the plid | |
1128 | * from the point of view of this host. | |
1129 | */ | |
f8134fed | 1130 | plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
54ef656b | 1131 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
f8134fed BC |
1132 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
1133 | llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); | |
c3896d2c | 1134 | |
296fcba3 | 1135 | /* WARNING: Only for sta pointer, is dropped & re-acquired */ |
d0709a65 JB |
1136 | rcu_read_lock(); |
1137 | ||
abe60632 | 1138 | sta = sta_info_get(sdata, mgmt->sa); |
32cb05bf | 1139 | |
55335137 | 1140 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
36c9bb29 | 1141 | !rssi_threshold_check(sdata, sta)) { |
bdcbd8e0 | 1142 | mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 1143 | mgmt->sa); |
fc10302e | 1144 | goto unlock_rcu; |
55335137 AN |
1145 | } |
1146 | ||
c3896d2c | 1147 | /* Now we will figure out the appropriate event... */ |
c99a89ed | 1148 | event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
54ab1ffb TP |
1149 | |
1150 | if (event == OPN_ACPT) { | |
296fcba3 | 1151 | rcu_read_unlock(); |
54ab1ffb | 1152 | /* allocate sta entry if necessary and update info */ |
ecbc12ad | 1153 | sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status); |
54ab1ffb | 1154 | if (!sta) { |
bdcbd8e0 | 1155 | mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
fc10302e | 1156 | goto unlock_rcu; |
54ab1ffb | 1157 | } |
433f5bc1 | 1158 | sta->mesh->plid = plid; |
c99a89ed | 1159 | } else if (!sta && event == OPN_RJCT) { |
a69bd8e6 | 1160 | mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE, |
c99a89ed | 1161 | mgmt->sa, 0, plid, |
6f101ef0 | 1162 | WLAN_REASON_MESH_CONFIG); |
c99a89ed TP |
1163 | goto unlock_rcu; |
1164 | } else if (!sta || event == PLINK_UNDEFINED) { | |
1165 | /* something went wrong */ | |
1166 | goto unlock_rcu; | |
c3896d2c LCC |
1167 | } |
1168 | ||
a69bd8e6 BC |
1169 | if (event == CNF_ACPT) { |
1170 | /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ | |
0e0060fc | 1171 | if (!sta->mesh->plid) |
a69bd8e6 | 1172 | sta->mesh->plid = plid; |
a69bd8e6 BC |
1173 | |
1174 | sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt)); | |
1175 | } | |
6c6fa496 | 1176 | |
c7e67811 | 1177 | changed |= mesh_plink_fsm(sdata, sta, event); |
d0709a65 | 1178 | |
fc10302e | 1179 | unlock_rcu: |
d0709a65 | 1180 | rcu_read_unlock(); |
57aac7c5 | 1181 | |
ecccd072 | 1182 | if (changed) |
2b5e1967 | 1183 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c | 1184 | } |
05a23ae9 TP |
1185 | |
1186 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1187 | struct ieee80211_mgmt *mgmt, size_t len, | |
1188 | struct ieee80211_rx_status *rx_status) | |
1189 | { | |
1190 | struct ieee802_11_elems elems; | |
1191 | size_t baselen; | |
1192 | u8 *baseaddr; | |
1193 | ||
1194 | /* need action_code, aux */ | |
1195 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
1196 | return; | |
1197 | ||
1198 | if (sdata->u.mesh.user_mpm) | |
1199 | /* userspace must register for these */ | |
1200 | return; | |
1201 | ||
1202 | if (is_multicast_ether_addr(mgmt->da)) { | |
1203 | mpl_dbg(sdata, | |
1204 | "Mesh plink: ignore frame from multicast address\n"); | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | baseaddr = mgmt->u.action.u.self_prot.variable; | |
1209 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
1210 | if (mgmt->u.action.u.self_prot.action_code == | |
1211 | WLAN_SP_MESH_PEERING_CONFIRM) { | |
1212 | baseaddr += 4; | |
1213 | baselen += 4; | |
b3e7de87 BC |
1214 | |
1215 | if (baselen > len) | |
1216 | return; | |
05a23ae9 | 1217 | } |
4abb52a4 SS |
1218 | ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems, |
1219 | mgmt->bssid, NULL); | |
ecbc12ad | 1220 | mesh_process_plink_frame(sdata, mgmt, &elems, rx_status); |
05a23ae9 | 1221 | } |