Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c3896d2c | 2 | /* |
264d9b7d | 3 | * Copyright (c) 2008, 2009 open80211s Ltd. |
90233160 | 4 | * Copyright (C) 2019, 2021-2024 Intel Corporation |
c3896d2c | 5 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
c3896d2c | 6 | */ |
5a0e3ad6 | 7 | #include <linux/gfp.h> |
902acc78 JB |
8 | #include <linux/kernel.h> |
9 | #include <linux/random.h> | |
b2d09103 IM |
10 | #include <linux/rculist.h> |
11 | ||
c3896d2c | 12 | #include "ieee80211_i.h" |
2c8dccc7 | 13 | #include "rate.h" |
c3896d2c | 14 | #include "mesh.h" |
c3896d2c | 15 | |
a69bd8e6 | 16 | #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2) |
8db09850 TP |
17 | #define PLINK_GET_LLID(p) (p + 2) |
18 | #define PLINK_GET_PLID(p) (p + 4) | |
c3896d2c | 19 | |
433f5bc1 | 20 | #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \ |
cc57ac53 | 21 | jiffies + msecs_to_jiffies(t))) |
c3896d2c | 22 | |
c3896d2c LCC |
23 | enum plink_event { |
24 | PLINK_UNDEFINED, | |
25 | OPN_ACPT, | |
26 | OPN_RJCT, | |
27 | OPN_IGNR, | |
28 | CNF_ACPT, | |
29 | CNF_RJCT, | |
30 | CNF_IGNR, | |
31 | CLS_ACPT, | |
32 | CLS_IGNR | |
33 | }; | |
34 | ||
95e48add TP |
35 | static const char * const mplstates[] = { |
36 | [NL80211_PLINK_LISTEN] = "LISTEN", | |
37 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
38 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
39 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
40 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
41 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
42 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
43 | }; | |
44 | ||
45 | static const char * const mplevents[] = { | |
46 | [PLINK_UNDEFINED] = "NONE", | |
47 | [OPN_ACPT] = "OPN_ACPT", | |
48 | [OPN_RJCT] = "OPN_RJCT", | |
49 | [OPN_IGNR] = "OPN_IGNR", | |
50 | [CNF_ACPT] = "CNF_ACPT", | |
51 | [CNF_RJCT] = "CNF_RJCT", | |
52 | [CNF_IGNR] = "CNF_IGNR", | |
53 | [CLS_ACPT] = "CLS_ACPT", | |
54 | [CLS_IGNR] = "CLS_IGNR" | |
55 | }; | |
56 | ||
36c9bb29 BC |
57 | /* We only need a valid sta if user configured a minimum rssi_threshold. */ |
58 | static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata, | |
59 | struct sta_info *sta) | |
60 | { | |
61 | s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold; | |
62 | return rssi_threshold == 0 || | |
e5a9f8d0 | 63 | (sta && |
046d2e7c S |
64 | (s8)-ewma_signal_read(&sta->deflink.rx_stats_avg.signal) > |
65 | rssi_threshold); | |
36c9bb29 BC |
66 | } |
67 | ||
c3896d2c LCC |
68 | /** |
69 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
70 | * | |
23c7a29c | 71 | * @sta: mesh peer link to restart |
c3896d2c | 72 | * |
433f5bc1 | 73 | * Locking: this function must be called holding sta->mesh->plink_lock |
c3896d2c LCC |
74 | */ |
75 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
76 | { | |
433f5bc1 JB |
77 | lockdep_assert_held(&sta->mesh->plink_lock); |
78 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; | |
79 | sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0; | |
80 | sta->mesh->plink_retries = 0; | |
c3896d2c LCC |
81 | } |
82 | ||
3b144658 TP |
83 | /* |
84 | * mesh_set_short_slot_time - enable / disable ERP short slot time. | |
85 | * | |
86 | * The standard indirectly mandates mesh STAs to turn off short slot time by | |
87 | * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we | |
88 | * can't be sneaky about it. Enable short slot time if all mesh STAs in the | |
89 | * MBSS support ERP rates. | |
90 | * | |
91 | * Returns BSS_CHANGED_ERP_SLOT or 0 for no change. | |
92 | */ | |
15ddba5f | 93 | static u64 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) |
3b144658 TP |
94 | { |
95 | struct ieee80211_local *local = sdata->local; | |
21a8e9dd | 96 | struct ieee80211_supported_band *sband; |
3b144658 | 97 | struct sta_info *sta; |
15ddba5f A |
98 | u32 erp_rates = 0; |
99 | u64 changed = 0; | |
3b144658 TP |
100 | int i; |
101 | bool short_slot = false; | |
102 | ||
21a8e9dd MSS |
103 | sband = ieee80211_get_sband(sdata); |
104 | if (!sband) | |
105 | return changed; | |
106 | ||
107 | if (sband->band == NL80211_BAND_5GHZ) { | |
3b144658 TP |
108 | /* (IEEE 802.11-2012 19.4.5) */ |
109 | short_slot = true; | |
110 | goto out; | |
21a8e9dd | 111 | } else if (sband->band != NL80211_BAND_2GHZ) { |
3b144658 | 112 | goto out; |
21a8e9dd | 113 | } |
3b144658 TP |
114 | |
115 | for (i = 0; i < sband->n_bitrates; i++) | |
116 | if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) | |
117 | erp_rates |= BIT(i); | |
118 | ||
119 | if (!erp_rates) | |
120 | goto out; | |
121 | ||
122 | rcu_read_lock(); | |
123 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
124 | if (sdata != sta->sdata || | |
433f5bc1 | 125 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
3b144658 TP |
126 | continue; |
127 | ||
128 | short_slot = false; | |
046d2e7c | 129 | if (erp_rates & sta->sta.deflink.supp_rates[sband->band]) |
3b144658 TP |
130 | short_slot = true; |
131 | else | |
132 | break; | |
133 | } | |
134 | rcu_read_unlock(); | |
135 | ||
136 | out: | |
137 | if (sdata->vif.bss_conf.use_short_slot != short_slot) { | |
138 | sdata->vif.bss_conf.use_short_slot = short_slot; | |
139 | changed = BSS_CHANGED_ERP_SLOT; | |
140 | mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", | |
141 | sdata->vif.addr, short_slot); | |
142 | } | |
143 | return changed; | |
144 | } | |
145 | ||
2c53040f | 146 | /** |
cbf9322e | 147 | * mesh_set_ht_prot_mode - set correct HT protection mode |
21439b65 | 148 | * @sdata: the (mesh) interface to handle |
57aac7c5 | 149 | * |
cbf9322e AN |
150 | * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT |
151 | * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT | |
152 | * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is | |
153 | * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode | |
ab4040df | 154 | * is selected if all peers in our 20/40MHz MBSS support HT and at least one |
cbf9322e | 155 | * HT20 peer is present. Otherwise no-protection mode is selected. |
c00de1c4 BB |
156 | * |
157 | * Returns: BSS_CHANGED_HT or 0 for no change | |
57aac7c5 | 158 | */ |
15ddba5f | 159 | static u64 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) |
57aac7c5 AN |
160 | { |
161 | struct ieee80211_local *local = sdata->local; | |
162 | struct sta_info *sta; | |
57aac7c5 AN |
163 | u16 ht_opmode; |
164 | bool non_ht_sta = false, ht20_sta = false; | |
165 | ||
6092077a | 166 | switch (sdata->vif.bss_conf.chanreq.oper.width) { |
0418a445 SW |
167 | case NL80211_CHAN_WIDTH_20_NOHT: |
168 | case NL80211_CHAN_WIDTH_5: | |
169 | case NL80211_CHAN_WIDTH_10: | |
57aac7c5 | 170 | return 0; |
0418a445 SW |
171 | default: |
172 | break; | |
173 | } | |
57aac7c5 AN |
174 | |
175 | rcu_read_lock(); | |
176 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
cbf9322e | 177 | if (sdata != sta->sdata || |
433f5bc1 | 178 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
cbf9322e AN |
179 | continue; |
180 | ||
046d2e7c | 181 | if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20) |
52ac8c48 TP |
182 | continue; |
183 | ||
046d2e7c | 184 | if (!sta->sta.deflink.ht_cap.ht_supported) { |
52ac8c48 TP |
185 | mpl_dbg(sdata, "nonHT sta (%pM) is present\n", |
186 | sta->sta.addr); | |
cbf9322e | 187 | non_ht_sta = true; |
cbf9322e | 188 | break; |
57aac7c5 | 189 | } |
52ac8c48 TP |
190 | |
191 | mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); | |
192 | ht20_sta = true; | |
57aac7c5 | 193 | } |
57aac7c5 AN |
194 | rcu_read_unlock(); |
195 | ||
196 | if (non_ht_sta) | |
197 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; | |
466f310d | 198 | else if (ht20_sta && |
6092077a | 199 | sdata->vif.bss_conf.chanreq.oper.width > NL80211_CHAN_WIDTH_20) |
57aac7c5 AN |
200 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; |
201 | else | |
202 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; | |
203 | ||
52ac8c48 TP |
204 | if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) |
205 | return 0; | |
57aac7c5 | 206 | |
52ac8c48 TP |
207 | sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
208 | sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; | |
209 | mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); | |
210 | return BSS_CHANGED_HT; | |
57aac7c5 AN |
211 | } |
212 | ||
f698d856 | 213 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
a69bd8e6 | 214 | struct sta_info *sta, |
bf7cd94d | 215 | enum ieee80211_self_protected_actioncode action, |
6f101ef0 | 216 | u8 *da, u16 llid, u16 plid, u16 reason) |
bf7cd94d | 217 | { |
f698d856 | 218 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 219 | struct sk_buff *skb; |
e7570dfb | 220 | struct ieee80211_tx_info *info; |
c3896d2c LCC |
221 | struct ieee80211_mgmt *mgmt; |
222 | bool include_plid = false; | |
8db09850 | 223 | u16 peering_proto = 0; |
3b69a9c5 | 224 | u8 *pos, ie_len = 4; |
df1875c4 | 225 | u8 ie_len_he_cap, ie_len_eht_cap; |
4c121fd6 | 226 | int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot); |
f609a43d | 227 | int err = -ENOMEM; |
3b69a9c5 | 228 | |
90233160 JB |
229 | ie_len_he_cap = ieee80211_ie_len_he_cap(sdata); |
230 | ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata); | |
65e8b0cc | 231 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
232 | hdr_len + |
233 | 2 + /* capability info */ | |
234 | 2 + /* AID */ | |
235 | 2 + 8 + /* supported rates */ | |
236 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
237 | 2 + sdata->u.mesh.mesh_id_len + | |
238 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 239 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 240 | 2 + sizeof(struct ieee80211_ht_operation) + |
c85fb53c BC |
241 | 2 + sizeof(struct ieee80211_vht_cap) + |
242 | 2 + sizeof(struct ieee80211_vht_operation) + | |
60ad72da SE |
243 | ie_len_he_cap + |
244 | 2 + 1 + sizeof(struct ieee80211_he_operation) + | |
d1b7524b | 245 | sizeof(struct ieee80211_he_6ghz_oper) + |
24a2042c | 246 | 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + |
df1875c4 RL |
247 | ie_len_eht_cap + |
248 | 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) + | |
249 | offsetof(struct ieee80211_eht_operation_info, optional) + | |
3b69a9c5 TP |
250 | 2 + 8 + /* peering IE */ |
251 | sdata->u.mesh.ie_len); | |
c3896d2c | 252 | if (!skb) |
87d84c45 | 253 | return err; |
e7570dfb | 254 | info = IEEE80211_SKB_CB(skb); |
65e8b0cc | 255 | skb_reserve(skb, local->tx_headroom); |
b080db58 | 256 | mgmt = skb_put_zero(skb, hdr_len); |
e7827a70 HH |
257 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
258 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 259 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 260 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 261 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
262 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
263 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 264 | |
8db09850 | 265 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
21a8e9dd | 266 | struct ieee80211_supported_band *sband; |
147ceae2 | 267 | u32 rate_flags, basic_rates; |
21a8e9dd MSS |
268 | |
269 | sband = ieee80211_get_sband(sdata); | |
270 | if (!sband) { | |
271 | err = -EINVAL; | |
272 | goto free; | |
273 | } | |
55de908a | 274 | |
8db09850 | 275 | /* capability info */ |
e45a79da | 276 | pos = skb_put_zero(skb, 2); |
54ef656b | 277 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
278 | /* AID */ |
279 | pos = skb_put(skb, 2); | |
a69bd8e6 | 280 | put_unaligned_le16(sta->sta.aid, pos); |
c3896d2c | 281 | } |
147ceae2 JB |
282 | |
283 | rate_flags = | |
284 | ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chanreq.oper); | |
285 | basic_rates = sdata->vif.bss_conf.basic_rates; | |
286 | ||
287 | if (ieee80211_put_srates_elem(skb, sband, basic_rates, | |
288 | rate_flags, 0, | |
289 | WLAN_EID_SUPP_RATES) || | |
290 | ieee80211_put_srates_elem(skb, sband, basic_rates, | |
291 | rate_flags, 0, | |
292 | WLAN_EID_EXT_SUPP_RATES) || | |
bf7cd94d JB |
293 | mesh_add_rsn_ie(sdata, skb) || |
294 | mesh_add_meshid_ie(sdata, skb) || | |
295 | mesh_add_meshconf_ie(sdata, skb)) | |
f609a43d | 296 | goto free; |
8db09850 | 297 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
e7570dfb | 298 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
bf7cd94d | 299 | if (mesh_add_meshid_ie(sdata, skb)) |
f609a43d | 300 | goto free; |
c3896d2c LCC |
301 | } |
302 | ||
8db09850 | 303 | /* Add Mesh Peering Management element */ |
c3896d2c | 304 | switch (action) { |
54ef656b | 305 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 306 | break; |
54ef656b | 307 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 308 | ie_len += 2; |
c3896d2c LCC |
309 | include_plid = true; |
310 | break; | |
54ef656b | 311 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
312 | if (plid) { |
313 | ie_len += 2; | |
c3896d2c LCC |
314 | include_plid = true; |
315 | } | |
8db09850 | 316 | ie_len += 2; /* reason code */ |
c3896d2c | 317 | break; |
8db09850 | 318 | default: |
f609a43d TP |
319 | err = -EINVAL; |
320 | goto free; | |
c3896d2c LCC |
321 | } |
322 | ||
8db09850 | 323 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
f609a43d | 324 | goto free; |
8db09850 | 325 | |
c3896d2c | 326 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 327 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 328 | *pos++ = ie_len; |
8db09850 TP |
329 | memcpy(pos, &peering_proto, 2); |
330 | pos += 2; | |
6f101ef0 | 331 | put_unaligned_le16(llid, pos); |
8db09850 | 332 | pos += 2; |
c3896d2c | 333 | if (include_plid) { |
6f101ef0 | 334 | put_unaligned_le16(plid, pos); |
8db09850 | 335 | pos += 2; |
c3896d2c | 336 | } |
54ef656b | 337 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
6f101ef0 | 338 | put_unaligned_le16(reason, pos); |
8db09850 | 339 | pos += 2; |
c3896d2c | 340 | } |
176f3608 TP |
341 | |
342 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
bf7cd94d | 343 | if (mesh_add_ht_cap_ie(sdata, skb) || |
c85fb53c BC |
344 | mesh_add_ht_oper_ie(sdata, skb) || |
345 | mesh_add_vht_cap_ie(sdata, skb) || | |
60ad72da SE |
346 | mesh_add_vht_oper_ie(sdata, skb) || |
347 | mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) || | |
24a2042c | 348 | mesh_add_he_oper_ie(sdata, skb) || |
df1875c4 RL |
349 | mesh_add_he_6ghz_cap_ie(sdata, skb) || |
350 | mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) || | |
351 | mesh_add_eht_oper_ie(sdata, skb)) | |
f609a43d | 352 | goto free; |
176f3608 TP |
353 | } |
354 | ||
bf7cd94d | 355 | if (mesh_add_vendor_ies(sdata, skb)) |
f609a43d | 356 | goto free; |
c3896d2c | 357 | |
62ae67be | 358 | ieee80211_tx_skb(sdata, skb); |
c3896d2c | 359 | return 0; |
f609a43d TP |
360 | free: |
361 | kfree_skb(skb); | |
362 | return err; | |
c3896d2c LCC |
363 | } |
364 | ||
fa87a656 BC |
365 | /** |
366 | * __mesh_plink_deactivate - deactivate mesh peer link | |
367 | * | |
368 | * @sta: mesh peer link to deactivate | |
369 | * | |
e596af82 BC |
370 | * Mesh paths with this peer as next hop should be flushed |
371 | * by the caller outside of plink_lock. | |
372 | * | |
c00de1c4 | 373 | * Returns: beacon changed flag if the beacon content changed. |
fa87a656 BC |
374 | * |
375 | * Locking: the caller must hold sta->mesh->plink_lock | |
376 | */ | |
15ddba5f | 377 | static u64 __mesh_plink_deactivate(struct sta_info *sta) |
fa87a656 BC |
378 | { |
379 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
15ddba5f | 380 | u64 changed = 0; |
fa87a656 BC |
381 | |
382 | lockdep_assert_held(&sta->mesh->plink_lock); | |
383 | ||
384 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) | |
385 | changed = mesh_plink_dec_estab_count(sdata); | |
386 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; | |
fa87a656 BC |
387 | |
388 | ieee80211_mps_sta_status_update(sta); | |
389 | changed |= ieee80211_mps_set_sta_local_pm(sta, | |
390 | NL80211_MESH_POWER_UNKNOWN); | |
391 | ||
392 | return changed; | |
393 | } | |
394 | ||
395 | /** | |
396 | * mesh_plink_deactivate - deactivate mesh peer link | |
397 | * | |
398 | * @sta: mesh peer link to deactivate | |
399 | * | |
400 | * All mesh paths with this peer as next hop will be flushed | |
c00de1c4 BB |
401 | * |
402 | * Returns: beacon changed flag if the beacon content changed. | |
fa87a656 | 403 | */ |
15ddba5f | 404 | u64 mesh_plink_deactivate(struct sta_info *sta) |
fa87a656 BC |
405 | { |
406 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
15ddba5f | 407 | u64 changed; |
fa87a656 BC |
408 | |
409 | spin_lock_bh(&sta->mesh->plink_lock); | |
410 | changed = __mesh_plink_deactivate(sta); | |
efc401f4 BC |
411 | |
412 | if (!sdata->u.mesh.user_mpm) { | |
413 | sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; | |
414 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, | |
415 | sta->sta.addr, sta->mesh->llid, | |
416 | sta->mesh->plid, sta->mesh->reason); | |
417 | } | |
fa87a656 | 418 | spin_unlock_bh(&sta->mesh->plink_lock); |
efc401f4 BC |
419 | if (!sdata->u.mesh.user_mpm) |
420 | del_timer_sync(&sta->mesh->plink_timer); | |
e596af82 | 421 | mesh_path_flush_by_nexthop(sta); |
fa87a656 | 422 | |
efc401f4 BC |
423 | /* make sure no readers can access nexthop sta from here on */ |
424 | synchronize_net(); | |
425 | ||
fa87a656 BC |
426 | return changed; |
427 | } | |
428 | ||
296fcba3 TP |
429 | static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
430 | struct sta_info *sta, | |
1d6741d8 | 431 | struct ieee802_11_elems *elems) |
c3896d2c | 432 | { |
f698d856 | 433 | struct ieee80211_local *local = sdata->local; |
54ab1ffb | 434 | struct ieee80211_supported_band *sband; |
f68d776a | 435 | u32 rates, basic_rates = 0, changed = 0; |
046d2e7c | 436 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; |
c3896d2c | 437 | |
21a8e9dd MSS |
438 | sband = ieee80211_get_sband(sdata); |
439 | if (!sband) | |
440 | return; | |
441 | ||
442 | rates = ieee80211_sta_get_rates(sdata, elems, sband->band, | |
443 | &basic_rates); | |
d0709a65 | 444 | |
433f5bc1 | 445 | spin_lock_bh(&sta->mesh->plink_lock); |
046d2e7c | 446 | sta->deflink.rx_stats.last_rx = jiffies; |
296fcba3 TP |
447 | |
448 | /* rates and capabilities don't change during peering */ | |
433f5bc1 JB |
449 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
450 | sta->mesh->processed_beacon) | |
296fcba3 | 451 | goto out; |
433f5bc1 | 452 | sta->mesh->processed_beacon = true; |
bae35d92 | 453 | |
046d2e7c | 454 | if (sta->sta.deflink.supp_rates[sband->band] != rates) |
f68d776a | 455 | changed |= IEEE80211_RC_SUPP_RATES_CHANGED; |
046d2e7c | 456 | sta->sta.deflink.supp_rates[sband->band] = rates; |
54ab1ffb | 457 | |
52ac8c48 | 458 | if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
c71420db JB |
459 | elems->ht_cap_elem, |
460 | &sta->deflink)) | |
52ac8c48 | 461 | changed |= IEEE80211_RC_BW_CHANGED; |
4bf88530 | 462 | |
c85fb53c | 463 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
084cf2ae | 464 | elems->vht_cap_elem, NULL, |
c71420db | 465 | &sta->deflink); |
c85fb53c | 466 | |
60ad72da | 467 | ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap, |
1bb9a8a4 JB |
468 | elems->he_cap_len, |
469 | elems->he_6ghz_capa, | |
c71420db | 470 | &sta->deflink); |
60ad72da | 471 | |
df1875c4 RL |
472 | ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap, |
473 | elems->he_cap_len, | |
474 | elems->eht_cap, elems->eht_cap_len, | |
475 | &sta->deflink); | |
476 | ||
046d2e7c | 477 | if (bw != sta->sta.deflink.bandwidth) |
abcff6ef JD |
478 | changed |= IEEE80211_RC_BW_CHANGED; |
479 | ||
52ac8c48 TP |
480 | /* HT peer is operating 20MHz-only */ |
481 | if (elems->ht_operation && | |
482 | !(elems->ht_operation->ht_param & | |
483 | IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
046d2e7c | 484 | if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20) |
f68d776a | 485 | changed |= IEEE80211_RC_BW_CHANGED; |
046d2e7c | 486 | sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20; |
57aac7c5 | 487 | } |
c7d25828 | 488 | |
1d6741d8 | 489 | if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) |
59cf1d65 | 490 | rate_control_rate_init(sta); |
f68d776a | 491 | else |
b4f85443 | 492 | rate_control_rate_update(local, sband, sta, 0, changed); |
296fcba3 | 493 | out: |
433f5bc1 | 494 | spin_unlock_bh(&sta->mesh->plink_lock); |
296fcba3 TP |
495 | } |
496 | ||
0e0060fc BC |
497 | static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) |
498 | { | |
499 | struct sta_info *sta; | |
500 | unsigned long *aid_map; | |
501 | int aid; | |
502 | ||
37babce9 | 503 | aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL); |
0e0060fc BC |
504 | if (!aid_map) |
505 | return -ENOMEM; | |
506 | ||
507 | /* reserve aid 0 for mcast indication */ | |
508 | __set_bit(0, aid_map); | |
509 | ||
510 | rcu_read_lock(); | |
511 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) | |
512 | __set_bit(sta->sta.aid, aid_map); | |
513 | rcu_read_unlock(); | |
514 | ||
515 | aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); | |
37babce9 | 516 | bitmap_free(aid_map); |
0e0060fc BC |
517 | |
518 | if (aid > IEEE80211_MAX_AID) | |
519 | return -ENOBUFS; | |
520 | ||
521 | return aid; | |
522 | } | |
523 | ||
296fcba3 TP |
524 | static struct sta_info * |
525 | __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) | |
526 | { | |
527 | struct sta_info *sta; | |
0e0060fc | 528 | int aid; |
54ab1ffb | 529 | |
296fcba3 | 530 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
e87278e7 TP |
531 | return NULL; |
532 | ||
0e0060fc BC |
533 | aid = mesh_allocate_aid(sdata); |
534 | if (aid < 0) | |
535 | return NULL; | |
536 | ||
f36fe0a2 | 537 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
296fcba3 TP |
538 | if (!sta) |
539 | return NULL; | |
540 | ||
433f5bc1 | 541 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
a74a8c84 | 542 | sta->sta.wme = true; |
0e0060fc | 543 | sta->sta.aid = aid; |
296fcba3 TP |
544 | |
545 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); | |
546 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
547 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
548 | ||
296fcba3 TP |
549 | return sta; |
550 | } | |
551 | ||
552 | static struct sta_info * | |
553 | mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, | |
ecbc12ad BC |
554 | struct ieee802_11_elems *elems, |
555 | struct ieee80211_rx_status *rx_status) | |
296fcba3 TP |
556 | { |
557 | struct sta_info *sta = NULL; | |
558 | ||
a6dad6a2 TP |
559 | /* Userspace handles station allocation */ |
560 | if (sdata->u.mesh.user_mpm || | |
11197d00 MH |
561 | sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { |
562 | if (mesh_peer_accepts_plinks(elems) && | |
ecbc12ad BC |
563 | mesh_plink_availables(sdata)) { |
564 | int sig = 0; | |
565 | ||
566 | if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM)) | |
567 | sig = rx_status->signal; | |
568 | ||
11197d00 MH |
569 | cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
570 | elems->ie_start, | |
571 | elems->total_len, | |
ecbc12ad BC |
572 | sig, GFP_KERNEL); |
573 | } | |
11197d00 | 574 | } else |
296fcba3 TP |
575 | sta = __mesh_sta_info_alloc(sdata, addr); |
576 | ||
54ab1ffb TP |
577 | return sta; |
578 | } | |
579 | ||
296fcba3 TP |
580 | /* |
581 | * mesh_sta_info_get - return mesh sta info entry for @addr. | |
582 | * | |
583 | * @sdata: local meshif | |
584 | * @addr: peer's address | |
585 | * @elems: IEs from beacon or mesh peering frame. | |
ecbc12ad | 586 | * @rx_status: rx status for the frame for signal reporting |
296fcba3 TP |
587 | * |
588 | * Return existing or newly allocated sta_info under RCU read lock. | |
589 | * (re)initialize with given IEs. | |
590 | */ | |
591 | static struct sta_info * | |
592 | mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, | |
ecbc12ad BC |
593 | u8 *addr, struct ieee802_11_elems *elems, |
594 | struct ieee80211_rx_status *rx_status) __acquires(RCU) | |
296fcba3 TP |
595 | { |
596 | struct sta_info *sta = NULL; | |
597 | ||
598 | rcu_read_lock(); | |
599 | sta = sta_info_get(sdata, addr); | |
600 | if (sta) { | |
1d6741d8 | 601 | mesh_sta_info_init(sdata, sta, elems); |
296fcba3 TP |
602 | } else { |
603 | rcu_read_unlock(); | |
604 | /* can't run atomic */ | |
ecbc12ad | 605 | sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status); |
296fcba3 TP |
606 | if (!sta) { |
607 | rcu_read_lock(); | |
608 | return NULL; | |
609 | } | |
610 | ||
1d6741d8 | 611 | mesh_sta_info_init(sdata, sta, elems); |
3b4797bc | 612 | |
296fcba3 TP |
613 | if (sta_info_insert_rcu(sta)) |
614 | return NULL; | |
615 | } | |
616 | ||
617 | return sta; | |
618 | } | |
619 | ||
620 | /* | |
621 | * mesh_neighbour_update - update or initialize new mesh neighbor. | |
622 | * | |
623 | * @sdata: local meshif | |
624 | * @addr: peer's address | |
625 | * @elems: IEs from beacon or mesh peering frame | |
ecbc12ad | 626 | * @rx_status: rx status for the frame for signal reporting |
296fcba3 TP |
627 | * |
628 | * Initiates peering if appropriate. | |
629 | */ | |
f743ff49 TP |
630 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
631 | u8 *hw_addr, | |
ecbc12ad BC |
632 | struct ieee802_11_elems *elems, |
633 | struct ieee80211_rx_status *rx_status) | |
54ab1ffb TP |
634 | { |
635 | struct sta_info *sta; | |
15ddba5f | 636 | u64 changed = 0; |
54ab1ffb | 637 | |
ecbc12ad | 638 | sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status); |
54ab1ffb TP |
639 | if (!sta) |
640 | goto out; | |
641 | ||
dbdaee7a BC |
642 | sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form & |
643 | IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE; | |
644 | ||
1570ca59 | 645 | if (mesh_peer_accepts_plinks(elems) && |
433f5bc1 | 646 | sta->mesh->plink_state == NL80211_PLINK_LISTEN && |
54ab1ffb TP |
647 | sdata->u.mesh.accepting_plinks && |
648 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
36c9bb29 | 649 | rssi_threshold_check(sdata, sta)) |
39886b61 | 650 | changed = mesh_plink_open(sta); |
c3896d2c | 651 | |
3f52b7e3 | 652 | ieee80211_mps_frame_release(sta, elems); |
54ab1ffb | 653 | out: |
d0709a65 | 654 | rcu_read_unlock(); |
2b5e1967 | 655 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c LCC |
656 | } |
657 | ||
4c02d62f | 658 | void mesh_plink_timer(struct timer_list *t) |
c3896d2c | 659 | { |
4c02d62f | 660 | struct mesh_sta *mesh = from_timer(mesh, t, plink_timer); |
c3896d2c | 661 | struct sta_info *sta; |
6f101ef0 | 662 | u16 reason = 0; |
c3896d2c | 663 | struct ieee80211_sub_if_data *sdata; |
453e66f2 | 664 | struct mesh_config *mshcfg; |
4efec451 | 665 | enum ieee80211_self_protected_actioncode action = 0; |
c3896d2c | 666 | |
d0709a65 JB |
667 | /* |
668 | * This STA is valid because sta_info_destroy() will | |
669 | * del_timer_sync() this timer after having made sure | |
670 | * it cannot be readded (by deleting the plink.) | |
671 | */ | |
4c02d62f | 672 | sta = mesh->plink_sta; |
c3896d2c | 673 | |
690205f1 | 674 | if (sta->sdata->local->quiescing) |
5bb644a0 | 675 | return; |
5bb644a0 | 676 | |
433f5bc1 | 677 | spin_lock_bh(&sta->mesh->plink_lock); |
2b470c39 BC |
678 | |
679 | /* If a timer fires just before a state transition on another CPU, | |
680 | * we may have already extended the timeout and changed state by the | |
681 | * time we've acquired the lock and arrived here. In that case, | |
682 | * skip this timer and wait for the new one. | |
683 | */ | |
433f5bc1 | 684 | if (time_before(jiffies, sta->mesh->plink_timer.expires)) { |
2b470c39 BC |
685 | mpl_dbg(sta->sdata, |
686 | "Ignoring timer for %pM in state %s (timer adjusted)", | |
433f5bc1 JB |
687 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
688 | spin_unlock_bh(&sta->mesh->plink_lock); | |
c3896d2c LCC |
689 | return; |
690 | } | |
2b470c39 BC |
691 | |
692 | /* del_timer() and handler may race when entering these states */ | |
433f5bc1 JB |
693 | if (sta->mesh->plink_state == NL80211_PLINK_LISTEN || |
694 | sta->mesh->plink_state == NL80211_PLINK_ESTAB) { | |
2b470c39 BC |
695 | mpl_dbg(sta->sdata, |
696 | "Ignoring timer for %pM in state %s (timer deleted)", | |
433f5bc1 JB |
697 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
698 | spin_unlock_bh(&sta->mesh->plink_lock); | |
2b470c39 BC |
699 | return; |
700 | } | |
701 | ||
bdcbd8e0 | 702 | mpl_dbg(sta->sdata, |
3088f7d2 | 703 | "Mesh plink timer for %pM fired on state %s\n", |
433f5bc1 | 704 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
d0709a65 | 705 | sdata = sta->sdata; |
453e66f2 | 706 | mshcfg = &sdata->u.mesh.mshcfg; |
c3896d2c | 707 | |
433f5bc1 | 708 | switch (sta->mesh->plink_state) { |
57cf8043 JC |
709 | case NL80211_PLINK_OPN_RCVD: |
710 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c | 711 | /* retry timer */ |
433f5bc1 | 712 | if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) { |
c3896d2c | 713 | u32 rand; |
bdcbd8e0 JB |
714 | mpl_dbg(sta->sdata, |
715 | "Mesh plink for %pM (retry, timeout): %d %d\n", | |
433f5bc1 JB |
716 | sta->sta.addr, sta->mesh->plink_retries, |
717 | sta->mesh->plink_timeout); | |
c3896d2c | 718 | get_random_bytes(&rand, sizeof(u32)); |
433f5bc1 JB |
719 | sta->mesh->plink_timeout = sta->mesh->plink_timeout + |
720 | rand % sta->mesh->plink_timeout; | |
721 | ++sta->mesh->plink_retries; | |
722 | mod_plink_timer(sta, sta->mesh->plink_timeout); | |
4efec451 | 723 | action = WLAN_SP_MESH_PEERING_OPEN; |
c3896d2c LCC |
724 | break; |
725 | } | |
6f101ef0 | 726 | reason = WLAN_REASON_MESH_MAX_RETRIES; |
fc0561dc | 727 | fallthrough; |
57cf8043 | 728 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
729 | /* confirm timer */ |
730 | if (!reason) | |
6f101ef0 | 731 | reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; |
433f5bc1 | 732 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; |
453e66f2 | 733 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
4efec451 | 734 | action = WLAN_SP_MESH_PEERING_CLOSE; |
c3896d2c | 735 | break; |
57cf8043 | 736 | case NL80211_PLINK_HOLDING: |
c3896d2c | 737 | /* holding timer */ |
433f5bc1 | 738 | del_timer(&sta->mesh->plink_timer); |
c3896d2c | 739 | mesh_plink_fsm_restart(sta); |
c3896d2c LCC |
740 | break; |
741 | default: | |
c3896d2c LCC |
742 | break; |
743 | } | |
433f5bc1 | 744 | spin_unlock_bh(&sta->mesh->plink_lock); |
4efec451 | 745 | if (action) |
a69bd8e6 | 746 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 | 747 | sta->mesh->llid, sta->mesh->plid, reason); |
c3896d2c LCC |
748 | } |
749 | ||
0df2f6c1 | 750 | static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
c3896d2c | 751 | { |
433f5bc1 | 752 | sta->mesh->plink_timeout = timeout; |
4c02d62f | 753 | mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout)); |
c3896d2c LCC |
754 | } |
755 | ||
204d1304 | 756 | static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
6f101ef0 | 757 | u16 llid) |
204d1304 TP |
758 | { |
759 | struct ieee80211_local *local = sdata->local; | |
760 | bool in_use = false; | |
761 | struct sta_info *sta; | |
762 | ||
763 | rcu_read_lock(); | |
764 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
520c75dc MS |
765 | if (sdata != sta->sdata) |
766 | continue; | |
767 | ||
433f5bc1 | 768 | if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) { |
204d1304 TP |
769 | in_use = true; |
770 | break; | |
771 | } | |
772 | } | |
773 | rcu_read_unlock(); | |
774 | ||
775 | return in_use; | |
776 | } | |
777 | ||
6f101ef0 | 778 | static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
204d1304 TP |
779 | { |
780 | u16 llid; | |
781 | ||
782 | do { | |
783 | get_random_bytes(&llid, sizeof(llid)); | |
6f101ef0 | 784 | } while (llid_in_use(sdata, llid)); |
204d1304 | 785 | |
6f101ef0 | 786 | return llid; |
204d1304 TP |
787 | } |
788 | ||
15ddba5f | 789 | u64 mesh_plink_open(struct sta_info *sta) |
c3896d2c | 790 | { |
d0709a65 | 791 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
15ddba5f | 792 | u64 changed; |
c3896d2c | 793 | |
c2c98fde | 794 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
39886b61 | 795 | return 0; |
53e80511 | 796 | |
433f5bc1 JB |
797 | spin_lock_bh(&sta->mesh->plink_lock); |
798 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
799 | if (sta->mesh->plink_state != NL80211_PLINK_LISTEN && | |
800 | sta->mesh->plink_state != NL80211_PLINK_BLOCKED) { | |
801 | spin_unlock_bh(&sta->mesh->plink_lock); | |
39886b61 | 802 | return 0; |
c3896d2c | 803 | } |
433f5bc1 | 804 | sta->mesh->plink_state = NL80211_PLINK_OPN_SNT; |
453e66f2 | 805 | mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
433f5bc1 | 806 | spin_unlock_bh(&sta->mesh->plink_lock); |
bdcbd8e0 JB |
807 | mpl_dbg(sdata, |
808 | "Mesh plink: starting establishment with %pM\n", | |
0c68ae26 | 809 | sta->sta.addr); |
c3896d2c | 810 | |
3f52b7e3 | 811 | /* set the non-peer mode to active during peering */ |
39886b61 | 812 | changed = ieee80211_mps_local_status_update(sdata); |
3f52b7e3 | 813 | |
a69bd8e6 | 814 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN, |
433f5bc1 | 815 | sta->sta.addr, sta->mesh->llid, 0, 0); |
39886b61 | 816 | return changed; |
c3896d2c LCC |
817 | } |
818 | ||
15ddba5f | 819 | u64 mesh_plink_block(struct sta_info *sta) |
c3896d2c | 820 | { |
15ddba5f | 821 | u64 changed; |
c9370197 | 822 | |
433f5bc1 | 823 | spin_lock_bh(&sta->mesh->plink_lock); |
df323818 | 824 | changed = __mesh_plink_deactivate(sta); |
433f5bc1 JB |
825 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
826 | spin_unlock_bh(&sta->mesh->plink_lock); | |
e596af82 | 827 | mesh_path_flush_by_nexthop(sta); |
c9370197 | 828 | |
39886b61 | 829 | return changed; |
c3896d2c LCC |
830 | } |
831 | ||
e76d67f0 BC |
832 | static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
833 | struct sta_info *sta, | |
834 | enum plink_event event) | |
835 | { | |
836 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
6f101ef0 CYY |
837 | u16 reason = (event == CLS_ACPT) ? |
838 | WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; | |
e76d67f0 | 839 | |
433f5bc1 JB |
840 | sta->mesh->reason = reason; |
841 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; | |
272a9e26 | 842 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
e76d67f0 BC |
843 | } |
844 | ||
15ddba5f | 845 | static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, |
e76d67f0 BC |
846 | struct sta_info *sta) |
847 | { | |
848 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
15ddba5f | 849 | u64 changed = 0; |
e76d67f0 | 850 | |
433f5bc1 JB |
851 | del_timer(&sta->mesh->plink_timer); |
852 | sta->mesh->plink_state = NL80211_PLINK_ESTAB; | |
e76d67f0 BC |
853 | changed |= mesh_plink_inc_estab_count(sdata); |
854 | changed |= mesh_set_ht_prot_mode(sdata); | |
855 | changed |= mesh_set_short_slot_time(sdata); | |
856 | mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); | |
857 | ieee80211_mps_sta_status_update(sta); | |
858 | changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); | |
859 | return changed; | |
860 | } | |
861 | ||
c7e67811 TP |
862 | /** |
863 | * mesh_plink_fsm - step @sta MPM based on @event | |
864 | * | |
865 | * @sdata: interface | |
866 | * @sta: mesh neighbor | |
867 | * @event: peering event | |
868 | * | |
869 | * Return: changed MBSS flags | |
870 | */ | |
15ddba5f | 871 | static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, |
c7e67811 TP |
872 | struct sta_info *sta, enum plink_event event) |
873 | { | |
874 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
875 | enum ieee80211_self_protected_actioncode action = 0; | |
15ddba5f | 876 | u64 changed = 0; |
e596af82 | 877 | bool flush = false; |
c7e67811 TP |
878 | |
879 | mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, | |
433f5bc1 | 880 | mplstates[sta->mesh->plink_state], mplevents[event]); |
c7e67811 | 881 | |
433f5bc1 JB |
882 | spin_lock_bh(&sta->mesh->plink_lock); |
883 | switch (sta->mesh->plink_state) { | |
c7e67811 TP |
884 | case NL80211_PLINK_LISTEN: |
885 | switch (event) { | |
886 | case CLS_ACPT: | |
887 | mesh_plink_fsm_restart(sta); | |
888 | break; | |
889 | case OPN_ACPT: | |
433f5bc1 JB |
890 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
891 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
c7e67811 TP |
892 | mesh_plink_timer_set(sta, |
893 | mshcfg->dot11MeshRetryTimeout); | |
894 | ||
895 | /* set the non-peer mode to active during peering */ | |
896 | changed |= ieee80211_mps_local_status_update(sdata); | |
897 | action = WLAN_SP_MESH_PEERING_OPEN; | |
898 | break; | |
899 | default: | |
900 | break; | |
901 | } | |
902 | break; | |
903 | case NL80211_PLINK_OPN_SNT: | |
904 | switch (event) { | |
905 | case OPN_RJCT: | |
906 | case CNF_RJCT: | |
907 | case CLS_ACPT: | |
908 | mesh_plink_close(sdata, sta, event); | |
909 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
910 | break; | |
911 | case OPN_ACPT: | |
912 | /* retry timer is left untouched */ | |
433f5bc1 | 913 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
c7e67811 TP |
914 | action = WLAN_SP_MESH_PEERING_CONFIRM; |
915 | break; | |
916 | case CNF_ACPT: | |
433f5bc1 | 917 | sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD; |
2b470c39 | 918 | mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
c7e67811 TP |
919 | break; |
920 | default: | |
921 | break; | |
922 | } | |
923 | break; | |
924 | case NL80211_PLINK_OPN_RCVD: | |
925 | switch (event) { | |
926 | case OPN_RJCT: | |
927 | case CNF_RJCT: | |
928 | case CLS_ACPT: | |
929 | mesh_plink_close(sdata, sta, event); | |
930 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
931 | break; | |
932 | case OPN_ACPT: | |
933 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
934 | break; | |
935 | case CNF_ACPT: | |
936 | changed |= mesh_plink_establish(sdata, sta); | |
937 | break; | |
938 | default: | |
939 | break; | |
940 | } | |
941 | break; | |
942 | case NL80211_PLINK_CNF_RCVD: | |
943 | switch (event) { | |
944 | case OPN_RJCT: | |
945 | case CNF_RJCT: | |
946 | case CLS_ACPT: | |
947 | mesh_plink_close(sdata, sta, event); | |
948 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
949 | break; | |
950 | case OPN_ACPT: | |
951 | changed |= mesh_plink_establish(sdata, sta); | |
952 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
953 | break; | |
954 | default: | |
955 | break; | |
956 | } | |
957 | break; | |
958 | case NL80211_PLINK_ESTAB: | |
959 | switch (event) { | |
960 | case CLS_ACPT: | |
961 | changed |= __mesh_plink_deactivate(sta); | |
962 | changed |= mesh_set_ht_prot_mode(sdata); | |
963 | changed |= mesh_set_short_slot_time(sdata); | |
964 | mesh_plink_close(sdata, sta, event); | |
965 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
e596af82 | 966 | flush = true; |
c7e67811 TP |
967 | break; |
968 | case OPN_ACPT: | |
969 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
970 | break; | |
971 | default: | |
972 | break; | |
973 | } | |
974 | break; | |
975 | case NL80211_PLINK_HOLDING: | |
976 | switch (event) { | |
977 | case CLS_ACPT: | |
433f5bc1 | 978 | del_timer(&sta->mesh->plink_timer); |
c7e67811 TP |
979 | mesh_plink_fsm_restart(sta); |
980 | break; | |
981 | case OPN_ACPT: | |
982 | case CNF_ACPT: | |
983 | case OPN_RJCT: | |
984 | case CNF_RJCT: | |
985 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
986 | break; | |
987 | default: | |
988 | break; | |
989 | } | |
990 | break; | |
991 | default: | |
992 | /* should not get here, PLINK_BLOCKED is dealt with at the | |
993 | * beginning of the function | |
994 | */ | |
995 | break; | |
996 | } | |
433f5bc1 | 997 | spin_unlock_bh(&sta->mesh->plink_lock); |
e596af82 BC |
998 | if (flush) |
999 | mesh_path_flush_by_nexthop(sta); | |
c7e67811 | 1000 | if (action) { |
a69bd8e6 | 1001 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 JB |
1002 | sta->mesh->llid, sta->mesh->plid, |
1003 | sta->mesh->reason); | |
c7e67811 TP |
1004 | |
1005 | /* also send confirm in open case */ | |
1006 | if (action == WLAN_SP_MESH_PEERING_OPEN) { | |
a69bd8e6 | 1007 | mesh_plink_frame_tx(sdata, sta, |
c7e67811 | 1008 | WLAN_SP_MESH_PEERING_CONFIRM, |
433f5bc1 JB |
1009 | sta->sta.addr, sta->mesh->llid, |
1010 | sta->mesh->plid, 0); | |
c7e67811 TP |
1011 | } |
1012 | } | |
1013 | ||
1014 | return changed; | |
1015 | } | |
1016 | ||
c99a89ed TP |
1017 | /* |
1018 | * mesh_plink_get_event - get correct MPM event | |
1019 | * | |
1020 | * @sdata: interface | |
1021 | * @sta: peer, leave NULL if processing a frame from a new suitable peer | |
1022 | * @elems: peering management IEs | |
1023 | * @ftype: frame type | |
1024 | * @llid: peer's peer link ID | |
1025 | * @plid: peer's local link ID | |
1026 | * | |
1027 | * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as | |
1028 | * an error. | |
1029 | */ | |
1030 | static enum plink_event | |
1031 | mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, | |
1032 | struct sta_info *sta, | |
1033 | struct ieee802_11_elems *elems, | |
1034 | enum ieee80211_self_protected_actioncode ftype, | |
6f101ef0 | 1035 | u16 llid, u16 plid) |
c99a89ed TP |
1036 | { |
1037 | enum plink_event event = PLINK_UNDEFINED; | |
1038 | u8 ie_len = elems->peering_len; | |
1039 | bool matches_local; | |
1040 | ||
1041 | matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || | |
1042 | mesh_matches_local(sdata, elems)); | |
1043 | ||
1044 | /* deny open request from non-matching peer */ | |
1045 | if (!matches_local && !sta) { | |
1046 | event = OPN_RJCT; | |
1047 | goto out; | |
1048 | } | |
1049 | ||
1050 | if (!sta) { | |
1051 | if (ftype != WLAN_SP_MESH_PEERING_OPEN) { | |
1052 | mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); | |
1053 | goto out; | |
1054 | } | |
1055 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ | |
1056 | if (!mesh_plink_free_count(sdata)) { | |
1057 | mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); | |
1058 | goto out; | |
1059 | } | |
b8631c00 SS |
1060 | |
1061 | /* new matching peer */ | |
1062 | event = OPN_ACPT; | |
1063 | goto out; | |
c99a89ed TP |
1064 | } else { |
1065 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) { | |
1066 | mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); | |
1067 | goto out; | |
1068 | } | |
433f5bc1 | 1069 | if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED) |
c99a89ed TP |
1070 | goto out; |
1071 | } | |
1072 | ||
c99a89ed TP |
1073 | switch (ftype) { |
1074 | case WLAN_SP_MESH_PEERING_OPEN: | |
1075 | if (!matches_local) | |
1076 | event = OPN_RJCT; | |
8c386b16 JB |
1077 | else if (!mesh_plink_free_count(sdata) || |
1078 | (sta->mesh->plid && sta->mesh->plid != plid)) | |
c99a89ed TP |
1079 | event = OPN_IGNR; |
1080 | else | |
1081 | event = OPN_ACPT; | |
1082 | break; | |
1083 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
1084 | if (!matches_local) | |
1085 | event = CNF_RJCT; | |
8c386b16 JB |
1086 | else if (!mesh_plink_free_count(sdata) || |
1087 | sta->mesh->llid != llid || | |
1088 | (sta->mesh->plid && sta->mesh->plid != plid)) | |
c99a89ed TP |
1089 | event = CNF_IGNR; |
1090 | else | |
1091 | event = CNF_ACPT; | |
1092 | break; | |
1093 | case WLAN_SP_MESH_PEERING_CLOSE: | |
433f5bc1 | 1094 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
c99a89ed TP |
1095 | /* Do not check for llid or plid. This does not |
1096 | * follow the standard but since multiple plinks | |
1097 | * per sta are not supported, it is necessary in | |
1098 | * order to avoid a livelock when MP A sees an | |
1099 | * establish peer link to MP B but MP B does not | |
1100 | * see it. This can be caused by a timeout in | |
1101 | * B's peer link establishment or B beign | |
1102 | * restarted. | |
1103 | */ | |
1104 | event = CLS_ACPT; | |
433f5bc1 | 1105 | else if (sta->mesh->plid != plid) |
c99a89ed | 1106 | event = CLS_IGNR; |
433f5bc1 | 1107 | else if (ie_len == 8 && sta->mesh->llid != llid) |
c99a89ed TP |
1108 | event = CLS_IGNR; |
1109 | else | |
1110 | event = CLS_ACPT; | |
1111 | break; | |
1112 | default: | |
1113 | mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); | |
1114 | break; | |
1115 | } | |
1116 | ||
1117 | out: | |
1118 | return event; | |
1119 | } | |
1120 | ||
05a23ae9 TP |
1121 | static void |
1122 | mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1123 | struct ieee80211_mgmt *mgmt, | |
ecbc12ad BC |
1124 | struct ieee802_11_elems *elems, |
1125 | struct ieee80211_rx_status *rx_status) | |
c3896d2c | 1126 | { |
05a23ae9 | 1127 | |
c3896d2c LCC |
1128 | struct sta_info *sta; |
1129 | enum plink_event event; | |
54ef656b | 1130 | enum ieee80211_self_protected_actioncode ftype; |
15ddba5f | 1131 | u64 changed = 0; |
c99a89ed | 1132 | u8 ie_len = elems->peering_len; |
6f101ef0 | 1133 | u16 plid, llid = 0; |
c3896d2c | 1134 | |
05a23ae9 | 1135 | if (!elems->peering) { |
bdcbd8e0 JB |
1136 | mpl_dbg(sdata, |
1137 | "Mesh plink: missing necessary peer link ie\n"); | |
c3896d2c LCC |
1138 | return; |
1139 | } | |
bf7cd94d | 1140 | |
05a23ae9 | 1141 | if (elems->rsn_len && |
bf7cd94d | 1142 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
bdcbd8e0 JB |
1143 | mpl_dbg(sdata, |
1144 | "Mesh plink: can't establish link with secure peer\n"); | |
5cff5e01 JC |
1145 | return; |
1146 | } | |
c3896d2c | 1147 | |
8db09850 | 1148 | ftype = mgmt->u.action.u.self_prot.action_code; |
8db09850 TP |
1149 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
1150 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
1151 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
1152 | && ie_len != 8)) { | |
bdcbd8e0 JB |
1153 | mpl_dbg(sdata, |
1154 | "Mesh plink: incorrect plink ie length %d %d\n", | |
1155 | ftype, ie_len); | |
c3896d2c LCC |
1156 | return; |
1157 | } | |
1158 | ||
54ef656b | 1159 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
05a23ae9 | 1160 | (!elems->mesh_id || !elems->mesh_config)) { |
bdcbd8e0 | 1161 | mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
c3896d2c LCC |
1162 | return; |
1163 | } | |
1164 | /* Note the lines below are correct, the llid in the frame is the plid | |
1165 | * from the point of view of this host. | |
1166 | */ | |
f8134fed | 1167 | plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
54ef656b | 1168 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
f8134fed BC |
1169 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
1170 | llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); | |
c3896d2c | 1171 | |
296fcba3 | 1172 | /* WARNING: Only for sta pointer, is dropped & re-acquired */ |
d0709a65 JB |
1173 | rcu_read_lock(); |
1174 | ||
abe60632 | 1175 | sta = sta_info_get(sdata, mgmt->sa); |
32cb05bf | 1176 | |
55335137 | 1177 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
36c9bb29 | 1178 | !rssi_threshold_check(sdata, sta)) { |
bdcbd8e0 | 1179 | mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 1180 | mgmt->sa); |
fc10302e | 1181 | goto unlock_rcu; |
55335137 AN |
1182 | } |
1183 | ||
c3896d2c | 1184 | /* Now we will figure out the appropriate event... */ |
c99a89ed | 1185 | event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
54ab1ffb TP |
1186 | |
1187 | if (event == OPN_ACPT) { | |
296fcba3 | 1188 | rcu_read_unlock(); |
54ab1ffb | 1189 | /* allocate sta entry if necessary and update info */ |
ecbc12ad | 1190 | sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status); |
54ab1ffb | 1191 | if (!sta) { |
bdcbd8e0 | 1192 | mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
fc10302e | 1193 | goto unlock_rcu; |
54ab1ffb | 1194 | } |
433f5bc1 | 1195 | sta->mesh->plid = plid; |
c99a89ed | 1196 | } else if (!sta && event == OPN_RJCT) { |
a69bd8e6 | 1197 | mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE, |
c99a89ed | 1198 | mgmt->sa, 0, plid, |
6f101ef0 | 1199 | WLAN_REASON_MESH_CONFIG); |
c99a89ed TP |
1200 | goto unlock_rcu; |
1201 | } else if (!sta || event == PLINK_UNDEFINED) { | |
1202 | /* something went wrong */ | |
1203 | goto unlock_rcu; | |
c3896d2c LCC |
1204 | } |
1205 | ||
a69bd8e6 BC |
1206 | if (event == CNF_ACPT) { |
1207 | /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ | |
0e0060fc | 1208 | if (!sta->mesh->plid) |
a69bd8e6 | 1209 | sta->mesh->plid = plid; |
a69bd8e6 BC |
1210 | |
1211 | sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt)); | |
1212 | } | |
6c6fa496 | 1213 | |
c7e67811 | 1214 | changed |= mesh_plink_fsm(sdata, sta, event); |
d0709a65 | 1215 | |
fc10302e | 1216 | unlock_rcu: |
d0709a65 | 1217 | rcu_read_unlock(); |
57aac7c5 | 1218 | |
ecccd072 | 1219 | if (changed) |
2b5e1967 | 1220 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c | 1221 | } |
05a23ae9 TP |
1222 | |
1223 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1224 | struct ieee80211_mgmt *mgmt, size_t len, | |
1225 | struct ieee80211_rx_status *rx_status) | |
1226 | { | |
5d24828d | 1227 | struct ieee802_11_elems *elems; |
05a23ae9 TP |
1228 | size_t baselen; |
1229 | u8 *baseaddr; | |
1230 | ||
1231 | /* need action_code, aux */ | |
1232 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
1233 | return; | |
1234 | ||
1235 | if (sdata->u.mesh.user_mpm) | |
1236 | /* userspace must register for these */ | |
1237 | return; | |
1238 | ||
1239 | if (is_multicast_ether_addr(mgmt->da)) { | |
1240 | mpl_dbg(sdata, | |
1241 | "Mesh plink: ignore frame from multicast address\n"); | |
1242 | return; | |
1243 | } | |
1244 | ||
1245 | baseaddr = mgmt->u.action.u.self_prot.variable; | |
1246 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
1247 | if (mgmt->u.action.u.self_prot.action_code == | |
1248 | WLAN_SP_MESH_PEERING_CONFIRM) { | |
1249 | baseaddr += 4; | |
1250 | baselen += 4; | |
b3e7de87 BC |
1251 | |
1252 | if (baselen > len) | |
1253 | return; | |
05a23ae9 | 1254 | } |
38c6aa29 | 1255 | elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL); |
1fc4a3ee JB |
1256 | if (elems) { |
1257 | mesh_process_plink_frame(sdata, mgmt, elems, rx_status); | |
1258 | kfree(elems); | |
1259 | } | |
05a23ae9 | 1260 | } |