Commit | Line | Data |
---|---|---|
c3896d2c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
c3896d2c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
5a0e3ad6 | 9 | #include <linux/gfp.h> |
902acc78 JB |
10 | #include <linux/kernel.h> |
11 | #include <linux/random.h> | |
c3896d2c | 12 | #include "ieee80211_i.h" |
2c8dccc7 | 13 | #include "rate.h" |
c3896d2c | 14 | #include "mesh.h" |
c3896d2c | 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 JB |
63 | (sta && |
64 | (s8)-ewma_signal_read(&sta->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 | */ | |
93 | static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) | |
94 | { | |
95 | struct ieee80211_local *local = sdata->local; | |
96 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); | |
97 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; | |
98 | struct sta_info *sta; | |
99 | u32 erp_rates = 0, changed = 0; | |
100 | int i; | |
101 | bool short_slot = false; | |
102 | ||
103 | if (band == IEEE80211_BAND_5GHZ) { | |
104 | /* (IEEE 802.11-2012 19.4.5) */ | |
105 | short_slot = true; | |
106 | goto out; | |
ea1b2b45 | 107 | } else if (band != IEEE80211_BAND_2GHZ) |
3b144658 TP |
108 | goto out; |
109 | ||
110 | for (i = 0; i < sband->n_bitrates; i++) | |
111 | if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) | |
112 | erp_rates |= BIT(i); | |
113 | ||
114 | if (!erp_rates) | |
115 | goto out; | |
116 | ||
117 | rcu_read_lock(); | |
118 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
119 | if (sdata != sta->sdata || | |
433f5bc1 | 120 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
3b144658 TP |
121 | continue; |
122 | ||
123 | short_slot = false; | |
124 | if (erp_rates & sta->sta.supp_rates[band]) | |
125 | short_slot = true; | |
126 | else | |
127 | break; | |
128 | } | |
129 | rcu_read_unlock(); | |
130 | ||
131 | out: | |
132 | if (sdata->vif.bss_conf.use_short_slot != short_slot) { | |
133 | sdata->vif.bss_conf.use_short_slot = short_slot; | |
134 | changed = BSS_CHANGED_ERP_SLOT; | |
135 | mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", | |
136 | sdata->vif.addr, short_slot); | |
137 | } | |
138 | return changed; | |
139 | } | |
140 | ||
2c53040f | 141 | /** |
cbf9322e | 142 | * mesh_set_ht_prot_mode - set correct HT protection mode |
57aac7c5 | 143 | * |
cbf9322e AN |
144 | * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT |
145 | * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT | |
146 | * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is | |
147 | * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode | |
148 | * is selected if all peers in our 20/40MHz MBSS support HT and atleast one | |
149 | * HT20 peer is present. Otherwise no-protection mode is selected. | |
57aac7c5 AN |
150 | */ |
151 | static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) | |
152 | { | |
153 | struct ieee80211_local *local = sdata->local; | |
154 | struct sta_info *sta; | |
57aac7c5 AN |
155 | u16 ht_opmode; |
156 | bool non_ht_sta = false, ht20_sta = false; | |
157 | ||
0418a445 SW |
158 | switch (sdata->vif.bss_conf.chandef.width) { |
159 | case NL80211_CHAN_WIDTH_20_NOHT: | |
160 | case NL80211_CHAN_WIDTH_5: | |
161 | case NL80211_CHAN_WIDTH_10: | |
57aac7c5 | 162 | return 0; |
0418a445 SW |
163 | default: |
164 | break; | |
165 | } | |
57aac7c5 AN |
166 | |
167 | rcu_read_lock(); | |
168 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
cbf9322e | 169 | if (sdata != sta->sdata || |
433f5bc1 | 170 | sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
cbf9322e AN |
171 | continue; |
172 | ||
52ac8c48 TP |
173 | if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20) |
174 | continue; | |
175 | ||
176 | if (!sta->sta.ht_cap.ht_supported) { | |
177 | mpl_dbg(sdata, "nonHT sta (%pM) is present\n", | |
178 | sta->sta.addr); | |
cbf9322e | 179 | non_ht_sta = true; |
cbf9322e | 180 | break; |
57aac7c5 | 181 | } |
52ac8c48 TP |
182 | |
183 | mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); | |
184 | ht20_sta = true; | |
57aac7c5 | 185 | } |
57aac7c5 AN |
186 | rcu_read_unlock(); |
187 | ||
188 | if (non_ht_sta) | |
189 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; | |
466f310d | 190 | else if (ht20_sta && |
4bf88530 | 191 | sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) |
57aac7c5 AN |
192 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; |
193 | else | |
194 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; | |
195 | ||
52ac8c48 TP |
196 | if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) |
197 | return 0; | |
57aac7c5 | 198 | |
52ac8c48 TP |
199 | sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
200 | sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; | |
201 | mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); | |
202 | return BSS_CHANGED_HT; | |
57aac7c5 AN |
203 | } |
204 | ||
f698d856 | 205 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
a69bd8e6 | 206 | struct sta_info *sta, |
bf7cd94d | 207 | enum ieee80211_self_protected_actioncode action, |
6f101ef0 | 208 | u8 *da, u16 llid, u16 plid, u16 reason) |
bf7cd94d | 209 | { |
f698d856 | 210 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 211 | struct sk_buff *skb; |
e7570dfb | 212 | struct ieee80211_tx_info *info; |
c3896d2c LCC |
213 | struct ieee80211_mgmt *mgmt; |
214 | bool include_plid = false; | |
8db09850 | 215 | u16 peering_proto = 0; |
3b69a9c5 TP |
216 | u8 *pos, ie_len = 4; |
217 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
218 | sizeof(mgmt->u.action.u.self_prot); | |
f609a43d | 219 | int err = -ENOMEM; |
3b69a9c5 | 220 | |
65e8b0cc | 221 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
222 | hdr_len + |
223 | 2 + /* capability info */ | |
224 | 2 + /* AID */ | |
225 | 2 + 8 + /* supported rates */ | |
226 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
227 | 2 + sdata->u.mesh.mesh_id_len + | |
228 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 229 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 230 | 2 + sizeof(struct ieee80211_ht_operation) + |
c85fb53c BC |
231 | 2 + sizeof(struct ieee80211_vht_cap) + |
232 | 2 + sizeof(struct ieee80211_vht_operation) + | |
3b69a9c5 TP |
233 | 2 + 8 + /* peering IE */ |
234 | sdata->u.mesh.ie_len); | |
c3896d2c | 235 | if (!skb) |
87d84c45 | 236 | return err; |
e7570dfb | 237 | info = IEEE80211_SKB_CB(skb); |
65e8b0cc | 238 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
239 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
240 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
241 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
242 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 243 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 244 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 245 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
246 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
247 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 248 | |
8db09850 | 249 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
55de908a JB |
250 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
251 | ||
8db09850 TP |
252 | /* capability info */ |
253 | pos = skb_put(skb, 2); | |
254 | memset(pos, 0, 2); | |
54ef656b | 255 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
256 | /* AID */ |
257 | pos = skb_put(skb, 2); | |
a69bd8e6 | 258 | put_unaligned_le16(sta->sta.aid, pos); |
c3896d2c | 259 | } |
55de908a JB |
260 | if (ieee80211_add_srates_ie(sdata, skb, true, band) || |
261 | ieee80211_add_ext_srates_ie(sdata, skb, true, band) || | |
bf7cd94d JB |
262 | mesh_add_rsn_ie(sdata, skb) || |
263 | mesh_add_meshid_ie(sdata, skb) || | |
264 | mesh_add_meshconf_ie(sdata, skb)) | |
f609a43d | 265 | goto free; |
8db09850 | 266 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
e7570dfb | 267 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
bf7cd94d | 268 | if (mesh_add_meshid_ie(sdata, skb)) |
f609a43d | 269 | goto free; |
c3896d2c LCC |
270 | } |
271 | ||
8db09850 | 272 | /* Add Mesh Peering Management element */ |
c3896d2c | 273 | switch (action) { |
54ef656b | 274 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 275 | break; |
54ef656b | 276 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 277 | ie_len += 2; |
c3896d2c LCC |
278 | include_plid = true; |
279 | break; | |
54ef656b | 280 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
281 | if (plid) { |
282 | ie_len += 2; | |
c3896d2c LCC |
283 | include_plid = true; |
284 | } | |
8db09850 | 285 | ie_len += 2; /* reason code */ |
c3896d2c | 286 | break; |
8db09850 | 287 | default: |
f609a43d TP |
288 | err = -EINVAL; |
289 | goto free; | |
c3896d2c LCC |
290 | } |
291 | ||
8db09850 | 292 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
f609a43d | 293 | goto free; |
8db09850 | 294 | |
c3896d2c | 295 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 296 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 297 | *pos++ = ie_len; |
8db09850 TP |
298 | memcpy(pos, &peering_proto, 2); |
299 | pos += 2; | |
6f101ef0 | 300 | put_unaligned_le16(llid, pos); |
8db09850 | 301 | pos += 2; |
c3896d2c | 302 | if (include_plid) { |
6f101ef0 | 303 | put_unaligned_le16(plid, pos); |
8db09850 | 304 | pos += 2; |
c3896d2c | 305 | } |
54ef656b | 306 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
6f101ef0 | 307 | put_unaligned_le16(reason, pos); |
8db09850 | 308 | pos += 2; |
c3896d2c | 309 | } |
176f3608 TP |
310 | |
311 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
bf7cd94d | 312 | if (mesh_add_ht_cap_ie(sdata, skb) || |
c85fb53c BC |
313 | mesh_add_ht_oper_ie(sdata, skb) || |
314 | mesh_add_vht_cap_ie(sdata, skb) || | |
315 | mesh_add_vht_oper_ie(sdata, skb)) | |
f609a43d | 316 | goto free; |
176f3608 TP |
317 | } |
318 | ||
bf7cd94d | 319 | if (mesh_add_vendor_ies(sdata, skb)) |
f609a43d | 320 | goto free; |
c3896d2c | 321 | |
62ae67be | 322 | ieee80211_tx_skb(sdata, skb); |
c3896d2c | 323 | return 0; |
f609a43d TP |
324 | free: |
325 | kfree_skb(skb); | |
326 | return err; | |
c3896d2c LCC |
327 | } |
328 | ||
fa87a656 BC |
329 | /** |
330 | * __mesh_plink_deactivate - deactivate mesh peer link | |
331 | * | |
332 | * @sta: mesh peer link to deactivate | |
333 | * | |
e596af82 BC |
334 | * Mesh paths with this peer as next hop should be flushed |
335 | * by the caller outside of plink_lock. | |
336 | * | |
fa87a656 BC |
337 | * Returns beacon changed flag if the beacon content changed. |
338 | * | |
339 | * Locking: the caller must hold sta->mesh->plink_lock | |
340 | */ | |
341 | static u32 __mesh_plink_deactivate(struct sta_info *sta) | |
342 | { | |
343 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
344 | u32 changed = 0; | |
345 | ||
346 | lockdep_assert_held(&sta->mesh->plink_lock); | |
347 | ||
348 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) | |
349 | changed = mesh_plink_dec_estab_count(sdata); | |
350 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; | |
fa87a656 BC |
351 | |
352 | ieee80211_mps_sta_status_update(sta); | |
353 | changed |= ieee80211_mps_set_sta_local_pm(sta, | |
354 | NL80211_MESH_POWER_UNKNOWN); | |
355 | ||
356 | return changed; | |
357 | } | |
358 | ||
359 | /** | |
360 | * mesh_plink_deactivate - deactivate mesh peer link | |
361 | * | |
362 | * @sta: mesh peer link to deactivate | |
363 | * | |
364 | * All mesh paths with this peer as next hop will be flushed | |
365 | */ | |
366 | u32 mesh_plink_deactivate(struct sta_info *sta) | |
367 | { | |
368 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
369 | u32 changed; | |
370 | ||
371 | spin_lock_bh(&sta->mesh->plink_lock); | |
372 | changed = __mesh_plink_deactivate(sta); | |
373 | sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; | |
a69bd8e6 | 374 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, |
fa87a656 BC |
375 | sta->sta.addr, sta->mesh->llid, sta->mesh->plid, |
376 | sta->mesh->reason); | |
377 | spin_unlock_bh(&sta->mesh->plink_lock); | |
e596af82 | 378 | mesh_path_flush_by_nexthop(sta); |
fa87a656 BC |
379 | |
380 | return changed; | |
381 | } | |
382 | ||
296fcba3 TP |
383 | static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
384 | struct sta_info *sta, | |
385 | struct ieee802_11_elems *elems, bool insert) | |
c3896d2c | 386 | { |
f698d856 | 387 | struct ieee80211_local *local = sdata->local; |
55de908a | 388 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
54ab1ffb | 389 | struct ieee80211_supported_band *sband; |
f68d776a | 390 | u32 rates, basic_rates = 0, changed = 0; |
abcff6ef | 391 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
c3896d2c | 392 | |
f743ff49 | 393 | sband = local->hw.wiphy->bands[band]; |
2103dec1 | 394 | rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates); |
d0709a65 | 395 | |
433f5bc1 | 396 | spin_lock_bh(&sta->mesh->plink_lock); |
e5a9f8d0 | 397 | sta->rx_stats.last_rx = jiffies; |
296fcba3 TP |
398 | |
399 | /* rates and capabilities don't change during peering */ | |
433f5bc1 JB |
400 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
401 | sta->mesh->processed_beacon) | |
296fcba3 | 402 | goto out; |
433f5bc1 | 403 | sta->mesh->processed_beacon = true; |
bae35d92 | 404 | |
f68d776a TP |
405 | if (sta->sta.supp_rates[band] != rates) |
406 | changed |= IEEE80211_RC_SUPP_RATES_CHANGED; | |
f743ff49 | 407 | sta->sta.supp_rates[band] = rates; |
54ab1ffb | 408 | |
52ac8c48 TP |
409 | if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
410 | elems->ht_cap_elem, sta)) | |
411 | changed |= IEEE80211_RC_BW_CHANGED; | |
4bf88530 | 412 | |
c85fb53c BC |
413 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
414 | elems->vht_cap_elem, sta); | |
415 | ||
abcff6ef JD |
416 | if (bw != sta->sta.bandwidth) |
417 | changed |= IEEE80211_RC_BW_CHANGED; | |
418 | ||
52ac8c48 TP |
419 | /* HT peer is operating 20MHz-only */ |
420 | if (elems->ht_operation && | |
421 | !(elems->ht_operation->ht_param & | |
422 | IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
423 | if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) | |
f68d776a | 424 | changed |= IEEE80211_RC_BW_CHANGED; |
52ac8c48 | 425 | sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; |
57aac7c5 | 426 | } |
c7d25828 | 427 | |
59cf1d65 HS |
428 | if (insert) |
429 | rate_control_rate_init(sta); | |
f68d776a TP |
430 | else |
431 | rate_control_rate_update(local, sband, sta, changed); | |
296fcba3 | 432 | out: |
433f5bc1 | 433 | spin_unlock_bh(&sta->mesh->plink_lock); |
296fcba3 TP |
434 | } |
435 | ||
0e0060fc BC |
436 | static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) |
437 | { | |
438 | struct sta_info *sta; | |
439 | unsigned long *aid_map; | |
440 | int aid; | |
441 | ||
442 | aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1), | |
443 | sizeof(*aid_map), GFP_KERNEL); | |
444 | if (!aid_map) | |
445 | return -ENOMEM; | |
446 | ||
447 | /* reserve aid 0 for mcast indication */ | |
448 | __set_bit(0, aid_map); | |
449 | ||
450 | rcu_read_lock(); | |
451 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) | |
452 | __set_bit(sta->sta.aid, aid_map); | |
453 | rcu_read_unlock(); | |
454 | ||
455 | aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); | |
456 | kfree(aid_map); | |
457 | ||
458 | if (aid > IEEE80211_MAX_AID) | |
459 | return -ENOBUFS; | |
460 | ||
461 | return aid; | |
462 | } | |
463 | ||
296fcba3 TP |
464 | static struct sta_info * |
465 | __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) | |
466 | { | |
467 | struct sta_info *sta; | |
0e0060fc | 468 | int aid; |
54ab1ffb | 469 | |
296fcba3 | 470 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
e87278e7 TP |
471 | return NULL; |
472 | ||
0e0060fc BC |
473 | aid = mesh_allocate_aid(sdata); |
474 | if (aid < 0) | |
475 | return NULL; | |
476 | ||
296fcba3 TP |
477 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
478 | if (!sta) | |
479 | return NULL; | |
480 | ||
433f5bc1 | 481 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
a74a8c84 | 482 | sta->sta.wme = true; |
0e0060fc | 483 | sta->sta.aid = aid; |
296fcba3 TP |
484 | |
485 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); | |
486 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
487 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
488 | ||
296fcba3 TP |
489 | return sta; |
490 | } | |
491 | ||
492 | static struct sta_info * | |
493 | mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, | |
494 | struct ieee802_11_elems *elems) | |
495 | { | |
496 | struct sta_info *sta = NULL; | |
497 | ||
a6dad6a2 TP |
498 | /* Userspace handles station allocation */ |
499 | if (sdata->u.mesh.user_mpm || | |
500 | sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) | |
296fcba3 TP |
501 | cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
502 | elems->ie_start, | |
503 | elems->total_len, | |
504 | GFP_KERNEL); | |
505 | else | |
506 | sta = __mesh_sta_info_alloc(sdata, addr); | |
507 | ||
54ab1ffb TP |
508 | return sta; |
509 | } | |
510 | ||
296fcba3 TP |
511 | /* |
512 | * mesh_sta_info_get - return mesh sta info entry for @addr. | |
513 | * | |
514 | * @sdata: local meshif | |
515 | * @addr: peer's address | |
516 | * @elems: IEs from beacon or mesh peering frame. | |
517 | * | |
518 | * Return existing or newly allocated sta_info under RCU read lock. | |
519 | * (re)initialize with given IEs. | |
520 | */ | |
521 | static struct sta_info * | |
522 | mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, | |
523 | u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU) | |
524 | { | |
525 | struct sta_info *sta = NULL; | |
526 | ||
527 | rcu_read_lock(); | |
528 | sta = sta_info_get(sdata, addr); | |
529 | if (sta) { | |
530 | mesh_sta_info_init(sdata, sta, elems, false); | |
531 | } else { | |
532 | rcu_read_unlock(); | |
533 | /* can't run atomic */ | |
534 | sta = mesh_sta_info_alloc(sdata, addr, elems); | |
535 | if (!sta) { | |
536 | rcu_read_lock(); | |
537 | return NULL; | |
538 | } | |
539 | ||
3b4797bc TP |
540 | mesh_sta_info_init(sdata, sta, elems, true); |
541 | ||
296fcba3 TP |
542 | if (sta_info_insert_rcu(sta)) |
543 | return NULL; | |
544 | } | |
545 | ||
546 | return sta; | |
547 | } | |
548 | ||
549 | /* | |
550 | * mesh_neighbour_update - update or initialize new mesh neighbor. | |
551 | * | |
552 | * @sdata: local meshif | |
553 | * @addr: peer's address | |
554 | * @elems: IEs from beacon or mesh peering frame | |
555 | * | |
556 | * Initiates peering if appropriate. | |
557 | */ | |
f743ff49 TP |
558 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
559 | u8 *hw_addr, | |
54ab1ffb TP |
560 | struct ieee802_11_elems *elems) |
561 | { | |
562 | struct sta_info *sta; | |
39886b61 | 563 | u32 changed = 0; |
54ab1ffb | 564 | |
296fcba3 | 565 | sta = mesh_sta_info_get(sdata, hw_addr, elems); |
54ab1ffb TP |
566 | if (!sta) |
567 | goto out; | |
568 | ||
1570ca59 | 569 | if (mesh_peer_accepts_plinks(elems) && |
433f5bc1 | 570 | sta->mesh->plink_state == NL80211_PLINK_LISTEN && |
54ab1ffb TP |
571 | sdata->u.mesh.accepting_plinks && |
572 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
36c9bb29 | 573 | rssi_threshold_check(sdata, sta)) |
39886b61 | 574 | changed = mesh_plink_open(sta); |
c3896d2c | 575 | |
3f52b7e3 | 576 | ieee80211_mps_frame_release(sta, elems); |
54ab1ffb | 577 | out: |
d0709a65 | 578 | rcu_read_unlock(); |
2b5e1967 | 579 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c LCC |
580 | } |
581 | ||
582 | static void mesh_plink_timer(unsigned long data) | |
583 | { | |
584 | struct sta_info *sta; | |
6f101ef0 | 585 | u16 reason = 0; |
c3896d2c | 586 | struct ieee80211_sub_if_data *sdata; |
453e66f2 | 587 | struct mesh_config *mshcfg; |
4efec451 | 588 | enum ieee80211_self_protected_actioncode action = 0; |
c3896d2c | 589 | |
d0709a65 JB |
590 | /* |
591 | * This STA is valid because sta_info_destroy() will | |
592 | * del_timer_sync() this timer after having made sure | |
593 | * it cannot be readded (by deleting the plink.) | |
594 | */ | |
c3896d2c LCC |
595 | sta = (struct sta_info *) data; |
596 | ||
690205f1 | 597 | if (sta->sdata->local->quiescing) |
5bb644a0 | 598 | return; |
5bb644a0 | 599 | |
433f5bc1 | 600 | spin_lock_bh(&sta->mesh->plink_lock); |
2b470c39 BC |
601 | |
602 | /* If a timer fires just before a state transition on another CPU, | |
603 | * we may have already extended the timeout and changed state by the | |
604 | * time we've acquired the lock and arrived here. In that case, | |
605 | * skip this timer and wait for the new one. | |
606 | */ | |
433f5bc1 | 607 | if (time_before(jiffies, sta->mesh->plink_timer.expires)) { |
2b470c39 BC |
608 | mpl_dbg(sta->sdata, |
609 | "Ignoring timer for %pM in state %s (timer adjusted)", | |
433f5bc1 JB |
610 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
611 | spin_unlock_bh(&sta->mesh->plink_lock); | |
c3896d2c LCC |
612 | return; |
613 | } | |
2b470c39 BC |
614 | |
615 | /* del_timer() and handler may race when entering these states */ | |
433f5bc1 JB |
616 | if (sta->mesh->plink_state == NL80211_PLINK_LISTEN || |
617 | sta->mesh->plink_state == NL80211_PLINK_ESTAB) { | |
2b470c39 BC |
618 | mpl_dbg(sta->sdata, |
619 | "Ignoring timer for %pM in state %s (timer deleted)", | |
433f5bc1 JB |
620 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
621 | spin_unlock_bh(&sta->mesh->plink_lock); | |
2b470c39 BC |
622 | return; |
623 | } | |
624 | ||
bdcbd8e0 | 625 | mpl_dbg(sta->sdata, |
3088f7d2 | 626 | "Mesh plink timer for %pM fired on state %s\n", |
433f5bc1 | 627 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
d0709a65 | 628 | sdata = sta->sdata; |
453e66f2 | 629 | mshcfg = &sdata->u.mesh.mshcfg; |
c3896d2c | 630 | |
433f5bc1 | 631 | switch (sta->mesh->plink_state) { |
57cf8043 JC |
632 | case NL80211_PLINK_OPN_RCVD: |
633 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c | 634 | /* retry timer */ |
433f5bc1 | 635 | if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) { |
c3896d2c | 636 | u32 rand; |
bdcbd8e0 JB |
637 | mpl_dbg(sta->sdata, |
638 | "Mesh plink for %pM (retry, timeout): %d %d\n", | |
433f5bc1 JB |
639 | sta->sta.addr, sta->mesh->plink_retries, |
640 | sta->mesh->plink_timeout); | |
c3896d2c | 641 | get_random_bytes(&rand, sizeof(u32)); |
433f5bc1 JB |
642 | sta->mesh->plink_timeout = sta->mesh->plink_timeout + |
643 | rand % sta->mesh->plink_timeout; | |
644 | ++sta->mesh->plink_retries; | |
645 | mod_plink_timer(sta, sta->mesh->plink_timeout); | |
4efec451 | 646 | action = WLAN_SP_MESH_PEERING_OPEN; |
c3896d2c LCC |
647 | break; |
648 | } | |
6f101ef0 | 649 | reason = WLAN_REASON_MESH_MAX_RETRIES; |
c3896d2c | 650 | /* fall through on else */ |
57cf8043 | 651 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
652 | /* confirm timer */ |
653 | if (!reason) | |
6f101ef0 | 654 | reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; |
433f5bc1 | 655 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; |
453e66f2 | 656 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
4efec451 | 657 | action = WLAN_SP_MESH_PEERING_CLOSE; |
c3896d2c | 658 | break; |
57cf8043 | 659 | case NL80211_PLINK_HOLDING: |
c3896d2c | 660 | /* holding timer */ |
433f5bc1 | 661 | del_timer(&sta->mesh->plink_timer); |
c3896d2c | 662 | mesh_plink_fsm_restart(sta); |
c3896d2c LCC |
663 | break; |
664 | default: | |
c3896d2c LCC |
665 | break; |
666 | } | |
433f5bc1 | 667 | spin_unlock_bh(&sta->mesh->plink_lock); |
4efec451 | 668 | if (action) |
a69bd8e6 | 669 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 | 670 | sta->mesh->llid, sta->mesh->plid, reason); |
c3896d2c LCC |
671 | } |
672 | ||
0df2f6c1 | 673 | static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
c3896d2c | 674 | { |
433f5bc1 JB |
675 | sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout); |
676 | sta->mesh->plink_timer.data = (unsigned long) sta; | |
677 | sta->mesh->plink_timer.function = mesh_plink_timer; | |
678 | sta->mesh->plink_timeout = timeout; | |
679 | add_timer(&sta->mesh->plink_timer); | |
c3896d2c LCC |
680 | } |
681 | ||
204d1304 | 682 | static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
6f101ef0 | 683 | u16 llid) |
204d1304 TP |
684 | { |
685 | struct ieee80211_local *local = sdata->local; | |
686 | bool in_use = false; | |
687 | struct sta_info *sta; | |
688 | ||
689 | rcu_read_lock(); | |
690 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
520c75dc MS |
691 | if (sdata != sta->sdata) |
692 | continue; | |
693 | ||
433f5bc1 | 694 | if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) { |
204d1304 TP |
695 | in_use = true; |
696 | break; | |
697 | } | |
698 | } | |
699 | rcu_read_unlock(); | |
700 | ||
701 | return in_use; | |
702 | } | |
703 | ||
6f101ef0 | 704 | static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
204d1304 TP |
705 | { |
706 | u16 llid; | |
707 | ||
708 | do { | |
709 | get_random_bytes(&llid, sizeof(llid)); | |
6f101ef0 | 710 | } while (llid_in_use(sdata, llid)); |
204d1304 | 711 | |
6f101ef0 | 712 | return llid; |
204d1304 TP |
713 | } |
714 | ||
39886b61 | 715 | u32 mesh_plink_open(struct sta_info *sta) |
c3896d2c | 716 | { |
d0709a65 | 717 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
39886b61 | 718 | u32 changed; |
c3896d2c | 719 | |
c2c98fde | 720 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
39886b61 | 721 | return 0; |
53e80511 | 722 | |
433f5bc1 JB |
723 | spin_lock_bh(&sta->mesh->plink_lock); |
724 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
725 | if (sta->mesh->plink_state != NL80211_PLINK_LISTEN && | |
726 | sta->mesh->plink_state != NL80211_PLINK_BLOCKED) { | |
727 | spin_unlock_bh(&sta->mesh->plink_lock); | |
39886b61 | 728 | return 0; |
c3896d2c | 729 | } |
433f5bc1 | 730 | sta->mesh->plink_state = NL80211_PLINK_OPN_SNT; |
453e66f2 | 731 | mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
433f5bc1 | 732 | spin_unlock_bh(&sta->mesh->plink_lock); |
bdcbd8e0 JB |
733 | mpl_dbg(sdata, |
734 | "Mesh plink: starting establishment with %pM\n", | |
0c68ae26 | 735 | sta->sta.addr); |
c3896d2c | 736 | |
3f52b7e3 | 737 | /* set the non-peer mode to active during peering */ |
39886b61 | 738 | changed = ieee80211_mps_local_status_update(sdata); |
3f52b7e3 | 739 | |
a69bd8e6 | 740 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN, |
433f5bc1 | 741 | sta->sta.addr, sta->mesh->llid, 0, 0); |
39886b61 | 742 | return changed; |
c3896d2c LCC |
743 | } |
744 | ||
39886b61 | 745 | u32 mesh_plink_block(struct sta_info *sta) |
c3896d2c | 746 | { |
df323818 | 747 | u32 changed; |
c9370197 | 748 | |
433f5bc1 | 749 | spin_lock_bh(&sta->mesh->plink_lock); |
df323818 | 750 | changed = __mesh_plink_deactivate(sta); |
433f5bc1 JB |
751 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
752 | spin_unlock_bh(&sta->mesh->plink_lock); | |
e596af82 | 753 | mesh_path_flush_by_nexthop(sta); |
c9370197 | 754 | |
39886b61 | 755 | return changed; |
c3896d2c LCC |
756 | } |
757 | ||
e76d67f0 BC |
758 | static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
759 | struct sta_info *sta, | |
760 | enum plink_event event) | |
761 | { | |
762 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
6f101ef0 CYY |
763 | u16 reason = (event == CLS_ACPT) ? |
764 | WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; | |
e76d67f0 | 765 | |
433f5bc1 JB |
766 | sta->mesh->reason = reason; |
767 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; | |
272a9e26 | 768 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
e76d67f0 BC |
769 | } |
770 | ||
771 | static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, | |
772 | struct sta_info *sta) | |
773 | { | |
774 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
775 | u32 changed = 0; | |
776 | ||
433f5bc1 JB |
777 | del_timer(&sta->mesh->plink_timer); |
778 | sta->mesh->plink_state = NL80211_PLINK_ESTAB; | |
e76d67f0 BC |
779 | changed |= mesh_plink_inc_estab_count(sdata); |
780 | changed |= mesh_set_ht_prot_mode(sdata); | |
781 | changed |= mesh_set_short_slot_time(sdata); | |
782 | mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); | |
783 | ieee80211_mps_sta_status_update(sta); | |
784 | changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); | |
785 | return changed; | |
786 | } | |
787 | ||
c7e67811 TP |
788 | /** |
789 | * mesh_plink_fsm - step @sta MPM based on @event | |
790 | * | |
791 | * @sdata: interface | |
792 | * @sta: mesh neighbor | |
793 | * @event: peering event | |
794 | * | |
795 | * Return: changed MBSS flags | |
796 | */ | |
797 | static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, | |
798 | struct sta_info *sta, enum plink_event event) | |
799 | { | |
800 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
801 | enum ieee80211_self_protected_actioncode action = 0; | |
802 | u32 changed = 0; | |
e596af82 | 803 | bool flush = false; |
c7e67811 TP |
804 | |
805 | mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, | |
433f5bc1 | 806 | mplstates[sta->mesh->plink_state], mplevents[event]); |
c7e67811 | 807 | |
433f5bc1 JB |
808 | spin_lock_bh(&sta->mesh->plink_lock); |
809 | switch (sta->mesh->plink_state) { | |
c7e67811 TP |
810 | case NL80211_PLINK_LISTEN: |
811 | switch (event) { | |
812 | case CLS_ACPT: | |
813 | mesh_plink_fsm_restart(sta); | |
814 | break; | |
815 | case OPN_ACPT: | |
433f5bc1 JB |
816 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
817 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
c7e67811 TP |
818 | mesh_plink_timer_set(sta, |
819 | mshcfg->dot11MeshRetryTimeout); | |
820 | ||
821 | /* set the non-peer mode to active during peering */ | |
822 | changed |= ieee80211_mps_local_status_update(sdata); | |
823 | action = WLAN_SP_MESH_PEERING_OPEN; | |
824 | break; | |
825 | default: | |
826 | break; | |
827 | } | |
828 | break; | |
829 | case NL80211_PLINK_OPN_SNT: | |
830 | switch (event) { | |
831 | case OPN_RJCT: | |
832 | case CNF_RJCT: | |
833 | case CLS_ACPT: | |
834 | mesh_plink_close(sdata, sta, event); | |
835 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
836 | break; | |
837 | case OPN_ACPT: | |
838 | /* retry timer is left untouched */ | |
433f5bc1 | 839 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
c7e67811 TP |
840 | action = WLAN_SP_MESH_PEERING_CONFIRM; |
841 | break; | |
842 | case CNF_ACPT: | |
433f5bc1 | 843 | sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD; |
2b470c39 | 844 | mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
c7e67811 TP |
845 | break; |
846 | default: | |
847 | break; | |
848 | } | |
849 | break; | |
850 | case NL80211_PLINK_OPN_RCVD: | |
851 | switch (event) { | |
852 | case OPN_RJCT: | |
853 | case CNF_RJCT: | |
854 | case CLS_ACPT: | |
855 | mesh_plink_close(sdata, sta, event); | |
856 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
857 | break; | |
858 | case OPN_ACPT: | |
859 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
860 | break; | |
861 | case CNF_ACPT: | |
862 | changed |= mesh_plink_establish(sdata, sta); | |
863 | break; | |
864 | default: | |
865 | break; | |
866 | } | |
867 | break; | |
868 | case NL80211_PLINK_CNF_RCVD: | |
869 | switch (event) { | |
870 | case OPN_RJCT: | |
871 | case CNF_RJCT: | |
872 | case CLS_ACPT: | |
873 | mesh_plink_close(sdata, sta, event); | |
874 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
875 | break; | |
876 | case OPN_ACPT: | |
877 | changed |= mesh_plink_establish(sdata, sta); | |
878 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
879 | break; | |
880 | default: | |
881 | break; | |
882 | } | |
883 | break; | |
884 | case NL80211_PLINK_ESTAB: | |
885 | switch (event) { | |
886 | case CLS_ACPT: | |
887 | changed |= __mesh_plink_deactivate(sta); | |
888 | changed |= mesh_set_ht_prot_mode(sdata); | |
889 | changed |= mesh_set_short_slot_time(sdata); | |
890 | mesh_plink_close(sdata, sta, event); | |
891 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
e596af82 | 892 | flush = true; |
c7e67811 TP |
893 | break; |
894 | case OPN_ACPT: | |
895 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
896 | break; | |
897 | default: | |
898 | break; | |
899 | } | |
900 | break; | |
901 | case NL80211_PLINK_HOLDING: | |
902 | switch (event) { | |
903 | case CLS_ACPT: | |
433f5bc1 | 904 | del_timer(&sta->mesh->plink_timer); |
c7e67811 TP |
905 | mesh_plink_fsm_restart(sta); |
906 | break; | |
907 | case OPN_ACPT: | |
908 | case CNF_ACPT: | |
909 | case OPN_RJCT: | |
910 | case CNF_RJCT: | |
911 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
912 | break; | |
913 | default: | |
914 | break; | |
915 | } | |
916 | break; | |
917 | default: | |
918 | /* should not get here, PLINK_BLOCKED is dealt with at the | |
919 | * beginning of the function | |
920 | */ | |
921 | break; | |
922 | } | |
433f5bc1 | 923 | spin_unlock_bh(&sta->mesh->plink_lock); |
e596af82 BC |
924 | if (flush) |
925 | mesh_path_flush_by_nexthop(sta); | |
c7e67811 | 926 | if (action) { |
a69bd8e6 | 927 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 JB |
928 | sta->mesh->llid, sta->mesh->plid, |
929 | sta->mesh->reason); | |
c7e67811 TP |
930 | |
931 | /* also send confirm in open case */ | |
932 | if (action == WLAN_SP_MESH_PEERING_OPEN) { | |
a69bd8e6 | 933 | mesh_plink_frame_tx(sdata, sta, |
c7e67811 | 934 | WLAN_SP_MESH_PEERING_CONFIRM, |
433f5bc1 JB |
935 | sta->sta.addr, sta->mesh->llid, |
936 | sta->mesh->plid, 0); | |
c7e67811 TP |
937 | } |
938 | } | |
939 | ||
940 | return changed; | |
941 | } | |
942 | ||
c99a89ed TP |
943 | /* |
944 | * mesh_plink_get_event - get correct MPM event | |
945 | * | |
946 | * @sdata: interface | |
947 | * @sta: peer, leave NULL if processing a frame from a new suitable peer | |
948 | * @elems: peering management IEs | |
949 | * @ftype: frame type | |
950 | * @llid: peer's peer link ID | |
951 | * @plid: peer's local link ID | |
952 | * | |
953 | * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as | |
954 | * an error. | |
955 | */ | |
956 | static enum plink_event | |
957 | mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, | |
958 | struct sta_info *sta, | |
959 | struct ieee802_11_elems *elems, | |
960 | enum ieee80211_self_protected_actioncode ftype, | |
6f101ef0 | 961 | u16 llid, u16 plid) |
c99a89ed TP |
962 | { |
963 | enum plink_event event = PLINK_UNDEFINED; | |
964 | u8 ie_len = elems->peering_len; | |
965 | bool matches_local; | |
966 | ||
967 | matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || | |
968 | mesh_matches_local(sdata, elems)); | |
969 | ||
970 | /* deny open request from non-matching peer */ | |
971 | if (!matches_local && !sta) { | |
972 | event = OPN_RJCT; | |
973 | goto out; | |
974 | } | |
975 | ||
976 | if (!sta) { | |
977 | if (ftype != WLAN_SP_MESH_PEERING_OPEN) { | |
978 | mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); | |
979 | goto out; | |
980 | } | |
981 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ | |
982 | if (!mesh_plink_free_count(sdata)) { | |
983 | mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); | |
984 | goto out; | |
985 | } | |
b8631c00 SS |
986 | |
987 | /* new matching peer */ | |
988 | event = OPN_ACPT; | |
989 | goto out; | |
c99a89ed TP |
990 | } else { |
991 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) { | |
992 | mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); | |
993 | goto out; | |
994 | } | |
433f5bc1 | 995 | if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED) |
c99a89ed TP |
996 | goto out; |
997 | } | |
998 | ||
c99a89ed TP |
999 | switch (ftype) { |
1000 | case WLAN_SP_MESH_PEERING_OPEN: | |
1001 | if (!matches_local) | |
1002 | event = OPN_RJCT; | |
1003 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 | 1004 | (sta->mesh->plid && sta->mesh->plid != plid)) |
c99a89ed TP |
1005 | event = OPN_IGNR; |
1006 | else | |
1007 | event = OPN_ACPT; | |
1008 | break; | |
1009 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
1010 | if (!matches_local) | |
1011 | event = CNF_RJCT; | |
1012 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 JB |
1013 | sta->mesh->llid != llid || |
1014 | (sta->mesh->plid && sta->mesh->plid != plid)) | |
c99a89ed TP |
1015 | event = CNF_IGNR; |
1016 | else | |
1017 | event = CNF_ACPT; | |
1018 | break; | |
1019 | case WLAN_SP_MESH_PEERING_CLOSE: | |
433f5bc1 | 1020 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
c99a89ed TP |
1021 | /* Do not check for llid or plid. This does not |
1022 | * follow the standard but since multiple plinks | |
1023 | * per sta are not supported, it is necessary in | |
1024 | * order to avoid a livelock when MP A sees an | |
1025 | * establish peer link to MP B but MP B does not | |
1026 | * see it. This can be caused by a timeout in | |
1027 | * B's peer link establishment or B beign | |
1028 | * restarted. | |
1029 | */ | |
1030 | event = CLS_ACPT; | |
433f5bc1 | 1031 | else if (sta->mesh->plid != plid) |
c99a89ed | 1032 | event = CLS_IGNR; |
433f5bc1 | 1033 | else if (ie_len == 8 && sta->mesh->llid != llid) |
c99a89ed TP |
1034 | event = CLS_IGNR; |
1035 | else | |
1036 | event = CLS_ACPT; | |
1037 | break; | |
1038 | default: | |
1039 | mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); | |
1040 | break; | |
1041 | } | |
1042 | ||
1043 | out: | |
1044 | return event; | |
1045 | } | |
1046 | ||
05a23ae9 TP |
1047 | static void |
1048 | mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1049 | struct ieee80211_mgmt *mgmt, | |
1050 | struct ieee802_11_elems *elems) | |
c3896d2c | 1051 | { |
05a23ae9 | 1052 | |
c3896d2c LCC |
1053 | struct sta_info *sta; |
1054 | enum plink_event event; | |
54ef656b | 1055 | enum ieee80211_self_protected_actioncode ftype; |
57aac7c5 | 1056 | u32 changed = 0; |
c99a89ed | 1057 | u8 ie_len = elems->peering_len; |
6f101ef0 | 1058 | u16 plid, llid = 0; |
c3896d2c | 1059 | |
05a23ae9 | 1060 | if (!elems->peering) { |
bdcbd8e0 JB |
1061 | mpl_dbg(sdata, |
1062 | "Mesh plink: missing necessary peer link ie\n"); | |
c3896d2c LCC |
1063 | return; |
1064 | } | |
bf7cd94d | 1065 | |
05a23ae9 | 1066 | if (elems->rsn_len && |
bf7cd94d | 1067 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
bdcbd8e0 JB |
1068 | mpl_dbg(sdata, |
1069 | "Mesh plink: can't establish link with secure peer\n"); | |
5cff5e01 JC |
1070 | return; |
1071 | } | |
c3896d2c | 1072 | |
8db09850 | 1073 | ftype = mgmt->u.action.u.self_prot.action_code; |
8db09850 TP |
1074 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
1075 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
1076 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
1077 | && ie_len != 8)) { | |
bdcbd8e0 JB |
1078 | mpl_dbg(sdata, |
1079 | "Mesh plink: incorrect plink ie length %d %d\n", | |
1080 | ftype, ie_len); | |
c3896d2c LCC |
1081 | return; |
1082 | } | |
1083 | ||
54ef656b | 1084 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
05a23ae9 | 1085 | (!elems->mesh_id || !elems->mesh_config)) { |
bdcbd8e0 | 1086 | mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
c3896d2c LCC |
1087 | return; |
1088 | } | |
1089 | /* Note the lines below are correct, the llid in the frame is the plid | |
1090 | * from the point of view of this host. | |
1091 | */ | |
f8134fed | 1092 | plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
54ef656b | 1093 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
f8134fed BC |
1094 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
1095 | llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); | |
c3896d2c | 1096 | |
296fcba3 | 1097 | /* WARNING: Only for sta pointer, is dropped & re-acquired */ |
d0709a65 JB |
1098 | rcu_read_lock(); |
1099 | ||
abe60632 | 1100 | sta = sta_info_get(sdata, mgmt->sa); |
32cb05bf | 1101 | |
55335137 | 1102 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
36c9bb29 | 1103 | !rssi_threshold_check(sdata, sta)) { |
bdcbd8e0 | 1104 | mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 1105 | mgmt->sa); |
fc10302e | 1106 | goto unlock_rcu; |
55335137 AN |
1107 | } |
1108 | ||
c3896d2c | 1109 | /* Now we will figure out the appropriate event... */ |
c99a89ed | 1110 | event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
54ab1ffb TP |
1111 | |
1112 | if (event == OPN_ACPT) { | |
296fcba3 | 1113 | rcu_read_unlock(); |
54ab1ffb | 1114 | /* allocate sta entry if necessary and update info */ |
05a23ae9 | 1115 | sta = mesh_sta_info_get(sdata, mgmt->sa, elems); |
54ab1ffb | 1116 | if (!sta) { |
bdcbd8e0 | 1117 | mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
fc10302e | 1118 | goto unlock_rcu; |
54ab1ffb | 1119 | } |
433f5bc1 | 1120 | sta->mesh->plid = plid; |
c99a89ed | 1121 | } else if (!sta && event == OPN_RJCT) { |
a69bd8e6 | 1122 | mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE, |
c99a89ed | 1123 | mgmt->sa, 0, plid, |
6f101ef0 | 1124 | WLAN_REASON_MESH_CONFIG); |
c99a89ed TP |
1125 | goto unlock_rcu; |
1126 | } else if (!sta || event == PLINK_UNDEFINED) { | |
1127 | /* something went wrong */ | |
1128 | goto unlock_rcu; | |
c3896d2c LCC |
1129 | } |
1130 | ||
a69bd8e6 BC |
1131 | if (event == CNF_ACPT) { |
1132 | /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ | |
0e0060fc | 1133 | if (!sta->mesh->plid) |
a69bd8e6 | 1134 | sta->mesh->plid = plid; |
a69bd8e6 BC |
1135 | |
1136 | sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt)); | |
1137 | } | |
6c6fa496 | 1138 | |
c7e67811 | 1139 | changed |= mesh_plink_fsm(sdata, sta, event); |
d0709a65 | 1140 | |
fc10302e | 1141 | unlock_rcu: |
d0709a65 | 1142 | rcu_read_unlock(); |
57aac7c5 | 1143 | |
ecccd072 | 1144 | if (changed) |
2b5e1967 | 1145 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c | 1146 | } |
05a23ae9 TP |
1147 | |
1148 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1149 | struct ieee80211_mgmt *mgmt, size_t len, | |
1150 | struct ieee80211_rx_status *rx_status) | |
1151 | { | |
1152 | struct ieee802_11_elems elems; | |
1153 | size_t baselen; | |
1154 | u8 *baseaddr; | |
1155 | ||
1156 | /* need action_code, aux */ | |
1157 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
1158 | return; | |
1159 | ||
1160 | if (sdata->u.mesh.user_mpm) | |
1161 | /* userspace must register for these */ | |
1162 | return; | |
1163 | ||
1164 | if (is_multicast_ether_addr(mgmt->da)) { | |
1165 | mpl_dbg(sdata, | |
1166 | "Mesh plink: ignore frame from multicast address\n"); | |
1167 | return; | |
1168 | } | |
1169 | ||
1170 | baseaddr = mgmt->u.action.u.self_prot.variable; | |
1171 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
1172 | if (mgmt->u.action.u.self_prot.action_code == | |
1173 | WLAN_SP_MESH_PEERING_CONFIRM) { | |
1174 | baseaddr += 4; | |
1175 | baselen += 4; | |
b3e7de87 BC |
1176 | |
1177 | if (baselen > len) | |
1178 | return; | |
05a23ae9 TP |
1179 | } |
1180 | ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems); | |
1181 | mesh_process_plink_frame(sdata, mgmt, &elems); | |
1182 | } |