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 | * | |
334 | * All mesh paths with this peer as next hop will be flushed | |
335 | * Returns beacon changed flag if the beacon content changed. | |
336 | * | |
337 | * Locking: the caller must hold sta->mesh->plink_lock | |
338 | */ | |
339 | static u32 __mesh_plink_deactivate(struct sta_info *sta) | |
340 | { | |
341 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
342 | u32 changed = 0; | |
343 | ||
344 | lockdep_assert_held(&sta->mesh->plink_lock); | |
345 | ||
346 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) | |
347 | changed = mesh_plink_dec_estab_count(sdata); | |
348 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; | |
349 | mesh_path_flush_by_nexthop(sta); | |
350 | ||
351 | ieee80211_mps_sta_status_update(sta); | |
352 | changed |= ieee80211_mps_set_sta_local_pm(sta, | |
353 | NL80211_MESH_POWER_UNKNOWN); | |
354 | ||
355 | return changed; | |
356 | } | |
357 | ||
358 | /** | |
359 | * mesh_plink_deactivate - deactivate mesh peer link | |
360 | * | |
361 | * @sta: mesh peer link to deactivate | |
362 | * | |
363 | * All mesh paths with this peer as next hop will be flushed | |
364 | */ | |
365 | u32 mesh_plink_deactivate(struct sta_info *sta) | |
366 | { | |
367 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
368 | u32 changed; | |
369 | ||
370 | spin_lock_bh(&sta->mesh->plink_lock); | |
371 | changed = __mesh_plink_deactivate(sta); | |
372 | sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; | |
a69bd8e6 | 373 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, |
fa87a656 BC |
374 | sta->sta.addr, sta->mesh->llid, sta->mesh->plid, |
375 | sta->mesh->reason); | |
376 | spin_unlock_bh(&sta->mesh->plink_lock); | |
377 | ||
378 | return changed; | |
379 | } | |
380 | ||
296fcba3 TP |
381 | static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
382 | struct sta_info *sta, | |
383 | struct ieee802_11_elems *elems, bool insert) | |
c3896d2c | 384 | { |
f698d856 | 385 | struct ieee80211_local *local = sdata->local; |
55de908a | 386 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
54ab1ffb | 387 | struct ieee80211_supported_band *sband; |
f68d776a | 388 | u32 rates, basic_rates = 0, changed = 0; |
abcff6ef | 389 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
c3896d2c | 390 | |
f743ff49 | 391 | sband = local->hw.wiphy->bands[band]; |
2103dec1 | 392 | rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates); |
d0709a65 | 393 | |
433f5bc1 | 394 | spin_lock_bh(&sta->mesh->plink_lock); |
e5a9f8d0 | 395 | sta->rx_stats.last_rx = jiffies; |
296fcba3 TP |
396 | |
397 | /* rates and capabilities don't change during peering */ | |
433f5bc1 JB |
398 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
399 | sta->mesh->processed_beacon) | |
296fcba3 | 400 | goto out; |
433f5bc1 | 401 | sta->mesh->processed_beacon = true; |
bae35d92 | 402 | |
f68d776a TP |
403 | if (sta->sta.supp_rates[band] != rates) |
404 | changed |= IEEE80211_RC_SUPP_RATES_CHANGED; | |
f743ff49 | 405 | sta->sta.supp_rates[band] = rates; |
54ab1ffb | 406 | |
52ac8c48 TP |
407 | if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
408 | elems->ht_cap_elem, sta)) | |
409 | changed |= IEEE80211_RC_BW_CHANGED; | |
4bf88530 | 410 | |
c85fb53c BC |
411 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
412 | elems->vht_cap_elem, sta); | |
413 | ||
abcff6ef JD |
414 | if (bw != sta->sta.bandwidth) |
415 | changed |= IEEE80211_RC_BW_CHANGED; | |
416 | ||
52ac8c48 TP |
417 | /* HT peer is operating 20MHz-only */ |
418 | if (elems->ht_operation && | |
419 | !(elems->ht_operation->ht_param & | |
420 | IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
421 | if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) | |
f68d776a | 422 | changed |= IEEE80211_RC_BW_CHANGED; |
52ac8c48 | 423 | sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; |
57aac7c5 | 424 | } |
c7d25828 | 425 | |
59cf1d65 HS |
426 | if (insert) |
427 | rate_control_rate_init(sta); | |
f68d776a TP |
428 | else |
429 | rate_control_rate_update(local, sband, sta, changed); | |
296fcba3 | 430 | out: |
433f5bc1 | 431 | spin_unlock_bh(&sta->mesh->plink_lock); |
296fcba3 TP |
432 | } |
433 | ||
0e0060fc BC |
434 | static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) |
435 | { | |
436 | struct sta_info *sta; | |
437 | unsigned long *aid_map; | |
438 | int aid; | |
439 | ||
440 | aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1), | |
441 | sizeof(*aid_map), GFP_KERNEL); | |
442 | if (!aid_map) | |
443 | return -ENOMEM; | |
444 | ||
445 | /* reserve aid 0 for mcast indication */ | |
446 | __set_bit(0, aid_map); | |
447 | ||
448 | rcu_read_lock(); | |
449 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) | |
450 | __set_bit(sta->sta.aid, aid_map); | |
451 | rcu_read_unlock(); | |
452 | ||
453 | aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); | |
454 | kfree(aid_map); | |
455 | ||
456 | if (aid > IEEE80211_MAX_AID) | |
457 | return -ENOBUFS; | |
458 | ||
459 | return aid; | |
460 | } | |
461 | ||
296fcba3 TP |
462 | static struct sta_info * |
463 | __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) | |
464 | { | |
465 | struct sta_info *sta; | |
0e0060fc | 466 | int aid; |
54ab1ffb | 467 | |
296fcba3 | 468 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
e87278e7 TP |
469 | return NULL; |
470 | ||
0e0060fc BC |
471 | aid = mesh_allocate_aid(sdata); |
472 | if (aid < 0) | |
473 | return NULL; | |
474 | ||
296fcba3 TP |
475 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
476 | if (!sta) | |
477 | return NULL; | |
478 | ||
433f5bc1 | 479 | sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
a74a8c84 | 480 | sta->sta.wme = true; |
0e0060fc | 481 | sta->sta.aid = aid; |
296fcba3 TP |
482 | |
483 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); | |
484 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
485 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
486 | ||
296fcba3 TP |
487 | return sta; |
488 | } | |
489 | ||
490 | static struct sta_info * | |
491 | mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, | |
492 | struct ieee802_11_elems *elems) | |
493 | { | |
494 | struct sta_info *sta = NULL; | |
495 | ||
a6dad6a2 TP |
496 | /* Userspace handles station allocation */ |
497 | if (sdata->u.mesh.user_mpm || | |
498 | sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) | |
296fcba3 TP |
499 | cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
500 | elems->ie_start, | |
501 | elems->total_len, | |
502 | GFP_KERNEL); | |
503 | else | |
504 | sta = __mesh_sta_info_alloc(sdata, addr); | |
505 | ||
54ab1ffb TP |
506 | return sta; |
507 | } | |
508 | ||
296fcba3 TP |
509 | /* |
510 | * mesh_sta_info_get - return mesh sta info entry for @addr. | |
511 | * | |
512 | * @sdata: local meshif | |
513 | * @addr: peer's address | |
514 | * @elems: IEs from beacon or mesh peering frame. | |
515 | * | |
516 | * Return existing or newly allocated sta_info under RCU read lock. | |
517 | * (re)initialize with given IEs. | |
518 | */ | |
519 | static struct sta_info * | |
520 | mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, | |
521 | u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU) | |
522 | { | |
523 | struct sta_info *sta = NULL; | |
524 | ||
525 | rcu_read_lock(); | |
526 | sta = sta_info_get(sdata, addr); | |
527 | if (sta) { | |
528 | mesh_sta_info_init(sdata, sta, elems, false); | |
529 | } else { | |
530 | rcu_read_unlock(); | |
531 | /* can't run atomic */ | |
532 | sta = mesh_sta_info_alloc(sdata, addr, elems); | |
533 | if (!sta) { | |
534 | rcu_read_lock(); | |
535 | return NULL; | |
536 | } | |
537 | ||
3b4797bc TP |
538 | mesh_sta_info_init(sdata, sta, elems, true); |
539 | ||
296fcba3 TP |
540 | if (sta_info_insert_rcu(sta)) |
541 | return NULL; | |
542 | } | |
543 | ||
544 | return sta; | |
545 | } | |
546 | ||
547 | /* | |
548 | * mesh_neighbour_update - update or initialize new mesh neighbor. | |
549 | * | |
550 | * @sdata: local meshif | |
551 | * @addr: peer's address | |
552 | * @elems: IEs from beacon or mesh peering frame | |
553 | * | |
554 | * Initiates peering if appropriate. | |
555 | */ | |
f743ff49 TP |
556 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
557 | u8 *hw_addr, | |
54ab1ffb TP |
558 | struct ieee802_11_elems *elems) |
559 | { | |
560 | struct sta_info *sta; | |
39886b61 | 561 | u32 changed = 0; |
54ab1ffb | 562 | |
296fcba3 | 563 | sta = mesh_sta_info_get(sdata, hw_addr, elems); |
54ab1ffb TP |
564 | if (!sta) |
565 | goto out; | |
566 | ||
1570ca59 | 567 | if (mesh_peer_accepts_plinks(elems) && |
433f5bc1 | 568 | sta->mesh->plink_state == NL80211_PLINK_LISTEN && |
54ab1ffb TP |
569 | sdata->u.mesh.accepting_plinks && |
570 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
36c9bb29 | 571 | rssi_threshold_check(sdata, sta)) |
39886b61 | 572 | changed = mesh_plink_open(sta); |
c3896d2c | 573 | |
3f52b7e3 | 574 | ieee80211_mps_frame_release(sta, elems); |
54ab1ffb | 575 | out: |
d0709a65 | 576 | rcu_read_unlock(); |
2b5e1967 | 577 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c LCC |
578 | } |
579 | ||
580 | static void mesh_plink_timer(unsigned long data) | |
581 | { | |
582 | struct sta_info *sta; | |
6f101ef0 | 583 | u16 reason = 0; |
c3896d2c | 584 | struct ieee80211_sub_if_data *sdata; |
453e66f2 | 585 | struct mesh_config *mshcfg; |
4efec451 | 586 | enum ieee80211_self_protected_actioncode action = 0; |
c3896d2c | 587 | |
d0709a65 JB |
588 | /* |
589 | * This STA is valid because sta_info_destroy() will | |
590 | * del_timer_sync() this timer after having made sure | |
591 | * it cannot be readded (by deleting the plink.) | |
592 | */ | |
c3896d2c LCC |
593 | sta = (struct sta_info *) data; |
594 | ||
690205f1 | 595 | if (sta->sdata->local->quiescing) |
5bb644a0 | 596 | return; |
5bb644a0 | 597 | |
433f5bc1 | 598 | spin_lock_bh(&sta->mesh->plink_lock); |
2b470c39 BC |
599 | |
600 | /* If a timer fires just before a state transition on another CPU, | |
601 | * we may have already extended the timeout and changed state by the | |
602 | * time we've acquired the lock and arrived here. In that case, | |
603 | * skip this timer and wait for the new one. | |
604 | */ | |
433f5bc1 | 605 | if (time_before(jiffies, sta->mesh->plink_timer.expires)) { |
2b470c39 BC |
606 | mpl_dbg(sta->sdata, |
607 | "Ignoring timer for %pM in state %s (timer adjusted)", | |
433f5bc1 JB |
608 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
609 | spin_unlock_bh(&sta->mesh->plink_lock); | |
c3896d2c LCC |
610 | return; |
611 | } | |
2b470c39 BC |
612 | |
613 | /* del_timer() and handler may race when entering these states */ | |
433f5bc1 JB |
614 | if (sta->mesh->plink_state == NL80211_PLINK_LISTEN || |
615 | sta->mesh->plink_state == NL80211_PLINK_ESTAB) { | |
2b470c39 BC |
616 | mpl_dbg(sta->sdata, |
617 | "Ignoring timer for %pM in state %s (timer deleted)", | |
433f5bc1 JB |
618 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
619 | spin_unlock_bh(&sta->mesh->plink_lock); | |
2b470c39 BC |
620 | return; |
621 | } | |
622 | ||
bdcbd8e0 | 623 | mpl_dbg(sta->sdata, |
3088f7d2 | 624 | "Mesh plink timer for %pM fired on state %s\n", |
433f5bc1 | 625 | sta->sta.addr, mplstates[sta->mesh->plink_state]); |
d0709a65 | 626 | sdata = sta->sdata; |
453e66f2 | 627 | mshcfg = &sdata->u.mesh.mshcfg; |
c3896d2c | 628 | |
433f5bc1 | 629 | switch (sta->mesh->plink_state) { |
57cf8043 JC |
630 | case NL80211_PLINK_OPN_RCVD: |
631 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c | 632 | /* retry timer */ |
433f5bc1 | 633 | if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) { |
c3896d2c | 634 | u32 rand; |
bdcbd8e0 JB |
635 | mpl_dbg(sta->sdata, |
636 | "Mesh plink for %pM (retry, timeout): %d %d\n", | |
433f5bc1 JB |
637 | sta->sta.addr, sta->mesh->plink_retries, |
638 | sta->mesh->plink_timeout); | |
c3896d2c | 639 | get_random_bytes(&rand, sizeof(u32)); |
433f5bc1 JB |
640 | sta->mesh->plink_timeout = sta->mesh->plink_timeout + |
641 | rand % sta->mesh->plink_timeout; | |
642 | ++sta->mesh->plink_retries; | |
643 | mod_plink_timer(sta, sta->mesh->plink_timeout); | |
4efec451 | 644 | action = WLAN_SP_MESH_PEERING_OPEN; |
c3896d2c LCC |
645 | break; |
646 | } | |
6f101ef0 | 647 | reason = WLAN_REASON_MESH_MAX_RETRIES; |
c3896d2c | 648 | /* fall through on else */ |
57cf8043 | 649 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
650 | /* confirm timer */ |
651 | if (!reason) | |
6f101ef0 | 652 | reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; |
433f5bc1 | 653 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; |
453e66f2 | 654 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
4efec451 | 655 | action = WLAN_SP_MESH_PEERING_CLOSE; |
c3896d2c | 656 | break; |
57cf8043 | 657 | case NL80211_PLINK_HOLDING: |
c3896d2c | 658 | /* holding timer */ |
433f5bc1 | 659 | del_timer(&sta->mesh->plink_timer); |
c3896d2c | 660 | mesh_plink_fsm_restart(sta); |
c3896d2c LCC |
661 | break; |
662 | default: | |
c3896d2c LCC |
663 | break; |
664 | } | |
433f5bc1 | 665 | spin_unlock_bh(&sta->mesh->plink_lock); |
4efec451 | 666 | if (action) |
a69bd8e6 | 667 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 | 668 | sta->mesh->llid, sta->mesh->plid, reason); |
c3896d2c LCC |
669 | } |
670 | ||
0df2f6c1 | 671 | static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
c3896d2c | 672 | { |
433f5bc1 JB |
673 | sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout); |
674 | sta->mesh->plink_timer.data = (unsigned long) sta; | |
675 | sta->mesh->plink_timer.function = mesh_plink_timer; | |
676 | sta->mesh->plink_timeout = timeout; | |
677 | add_timer(&sta->mesh->plink_timer); | |
c3896d2c LCC |
678 | } |
679 | ||
204d1304 | 680 | static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
6f101ef0 | 681 | u16 llid) |
204d1304 TP |
682 | { |
683 | struct ieee80211_local *local = sdata->local; | |
684 | bool in_use = false; | |
685 | struct sta_info *sta; | |
686 | ||
687 | rcu_read_lock(); | |
688 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
520c75dc MS |
689 | if (sdata != sta->sdata) |
690 | continue; | |
691 | ||
433f5bc1 | 692 | if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) { |
204d1304 TP |
693 | in_use = true; |
694 | break; | |
695 | } | |
696 | } | |
697 | rcu_read_unlock(); | |
698 | ||
699 | return in_use; | |
700 | } | |
701 | ||
6f101ef0 | 702 | static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
204d1304 TP |
703 | { |
704 | u16 llid; | |
705 | ||
706 | do { | |
707 | get_random_bytes(&llid, sizeof(llid)); | |
6f101ef0 | 708 | } while (llid_in_use(sdata, llid)); |
204d1304 | 709 | |
6f101ef0 | 710 | return llid; |
204d1304 TP |
711 | } |
712 | ||
39886b61 | 713 | u32 mesh_plink_open(struct sta_info *sta) |
c3896d2c | 714 | { |
d0709a65 | 715 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
39886b61 | 716 | u32 changed; |
c3896d2c | 717 | |
c2c98fde | 718 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
39886b61 | 719 | return 0; |
53e80511 | 720 | |
433f5bc1 JB |
721 | spin_lock_bh(&sta->mesh->plink_lock); |
722 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
723 | if (sta->mesh->plink_state != NL80211_PLINK_LISTEN && | |
724 | sta->mesh->plink_state != NL80211_PLINK_BLOCKED) { | |
725 | spin_unlock_bh(&sta->mesh->plink_lock); | |
39886b61 | 726 | return 0; |
c3896d2c | 727 | } |
433f5bc1 | 728 | sta->mesh->plink_state = NL80211_PLINK_OPN_SNT; |
453e66f2 | 729 | mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
433f5bc1 | 730 | spin_unlock_bh(&sta->mesh->plink_lock); |
bdcbd8e0 JB |
731 | mpl_dbg(sdata, |
732 | "Mesh plink: starting establishment with %pM\n", | |
0c68ae26 | 733 | sta->sta.addr); |
c3896d2c | 734 | |
3f52b7e3 | 735 | /* set the non-peer mode to active during peering */ |
39886b61 | 736 | changed = ieee80211_mps_local_status_update(sdata); |
3f52b7e3 | 737 | |
a69bd8e6 | 738 | mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN, |
433f5bc1 | 739 | sta->sta.addr, sta->mesh->llid, 0, 0); |
39886b61 | 740 | return changed; |
c3896d2c LCC |
741 | } |
742 | ||
39886b61 | 743 | u32 mesh_plink_block(struct sta_info *sta) |
c3896d2c | 744 | { |
df323818 | 745 | u32 changed; |
c9370197 | 746 | |
433f5bc1 | 747 | spin_lock_bh(&sta->mesh->plink_lock); |
df323818 | 748 | changed = __mesh_plink_deactivate(sta); |
433f5bc1 JB |
749 | sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
750 | spin_unlock_bh(&sta->mesh->plink_lock); | |
c9370197 | 751 | |
39886b61 | 752 | return changed; |
c3896d2c LCC |
753 | } |
754 | ||
e76d67f0 BC |
755 | static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
756 | struct sta_info *sta, | |
757 | enum plink_event event) | |
758 | { | |
759 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
6f101ef0 CYY |
760 | u16 reason = (event == CLS_ACPT) ? |
761 | WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; | |
e76d67f0 | 762 | |
433f5bc1 JB |
763 | sta->mesh->reason = reason; |
764 | sta->mesh->plink_state = NL80211_PLINK_HOLDING; | |
272a9e26 | 765 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
e76d67f0 BC |
766 | } |
767 | ||
768 | static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, | |
769 | struct sta_info *sta) | |
770 | { | |
771 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
772 | u32 changed = 0; | |
773 | ||
433f5bc1 JB |
774 | del_timer(&sta->mesh->plink_timer); |
775 | sta->mesh->plink_state = NL80211_PLINK_ESTAB; | |
e76d67f0 BC |
776 | changed |= mesh_plink_inc_estab_count(sdata); |
777 | changed |= mesh_set_ht_prot_mode(sdata); | |
778 | changed |= mesh_set_short_slot_time(sdata); | |
779 | mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); | |
780 | ieee80211_mps_sta_status_update(sta); | |
781 | changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); | |
782 | return changed; | |
783 | } | |
784 | ||
c7e67811 TP |
785 | /** |
786 | * mesh_plink_fsm - step @sta MPM based on @event | |
787 | * | |
788 | * @sdata: interface | |
789 | * @sta: mesh neighbor | |
790 | * @event: peering event | |
791 | * | |
792 | * Return: changed MBSS flags | |
793 | */ | |
794 | static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, | |
795 | struct sta_info *sta, enum plink_event event) | |
796 | { | |
797 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
798 | enum ieee80211_self_protected_actioncode action = 0; | |
799 | u32 changed = 0; | |
800 | ||
801 | mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, | |
433f5bc1 | 802 | mplstates[sta->mesh->plink_state], mplevents[event]); |
c7e67811 | 803 | |
433f5bc1 JB |
804 | spin_lock_bh(&sta->mesh->plink_lock); |
805 | switch (sta->mesh->plink_state) { | |
c7e67811 TP |
806 | case NL80211_PLINK_LISTEN: |
807 | switch (event) { | |
808 | case CLS_ACPT: | |
809 | mesh_plink_fsm_restart(sta); | |
810 | break; | |
811 | case OPN_ACPT: | |
433f5bc1 JB |
812 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
813 | sta->mesh->llid = mesh_get_new_llid(sdata); | |
c7e67811 TP |
814 | mesh_plink_timer_set(sta, |
815 | mshcfg->dot11MeshRetryTimeout); | |
816 | ||
817 | /* set the non-peer mode to active during peering */ | |
818 | changed |= ieee80211_mps_local_status_update(sdata); | |
819 | action = WLAN_SP_MESH_PEERING_OPEN; | |
820 | break; | |
821 | default: | |
822 | break; | |
823 | } | |
824 | break; | |
825 | case NL80211_PLINK_OPN_SNT: | |
826 | switch (event) { | |
827 | case OPN_RJCT: | |
828 | case CNF_RJCT: | |
829 | case CLS_ACPT: | |
830 | mesh_plink_close(sdata, sta, event); | |
831 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
832 | break; | |
833 | case OPN_ACPT: | |
834 | /* retry timer is left untouched */ | |
433f5bc1 | 835 | sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
c7e67811 TP |
836 | action = WLAN_SP_MESH_PEERING_CONFIRM; |
837 | break; | |
838 | case CNF_ACPT: | |
433f5bc1 | 839 | sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD; |
2b470c39 | 840 | mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
c7e67811 TP |
841 | break; |
842 | default: | |
843 | break; | |
844 | } | |
845 | break; | |
846 | case NL80211_PLINK_OPN_RCVD: | |
847 | switch (event) { | |
848 | case OPN_RJCT: | |
849 | case CNF_RJCT: | |
850 | case CLS_ACPT: | |
851 | mesh_plink_close(sdata, sta, event); | |
852 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
853 | break; | |
854 | case OPN_ACPT: | |
855 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
856 | break; | |
857 | case CNF_ACPT: | |
858 | changed |= mesh_plink_establish(sdata, sta); | |
859 | break; | |
860 | default: | |
861 | break; | |
862 | } | |
863 | break; | |
864 | case NL80211_PLINK_CNF_RCVD: | |
865 | switch (event) { | |
866 | case OPN_RJCT: | |
867 | case CNF_RJCT: | |
868 | case CLS_ACPT: | |
869 | mesh_plink_close(sdata, sta, event); | |
870 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
871 | break; | |
872 | case OPN_ACPT: | |
873 | changed |= mesh_plink_establish(sdata, sta); | |
874 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
875 | break; | |
876 | default: | |
877 | break; | |
878 | } | |
879 | break; | |
880 | case NL80211_PLINK_ESTAB: | |
881 | switch (event) { | |
882 | case CLS_ACPT: | |
883 | changed |= __mesh_plink_deactivate(sta); | |
884 | changed |= mesh_set_ht_prot_mode(sdata); | |
885 | changed |= mesh_set_short_slot_time(sdata); | |
886 | mesh_plink_close(sdata, sta, event); | |
887 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
888 | break; | |
889 | case OPN_ACPT: | |
890 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
891 | break; | |
892 | default: | |
893 | break; | |
894 | } | |
895 | break; | |
896 | case NL80211_PLINK_HOLDING: | |
897 | switch (event) { | |
898 | case CLS_ACPT: | |
433f5bc1 | 899 | del_timer(&sta->mesh->plink_timer); |
c7e67811 TP |
900 | mesh_plink_fsm_restart(sta); |
901 | break; | |
902 | case OPN_ACPT: | |
903 | case CNF_ACPT: | |
904 | case OPN_RJCT: | |
905 | case CNF_RJCT: | |
906 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
907 | break; | |
908 | default: | |
909 | break; | |
910 | } | |
911 | break; | |
912 | default: | |
913 | /* should not get here, PLINK_BLOCKED is dealt with at the | |
914 | * beginning of the function | |
915 | */ | |
916 | break; | |
917 | } | |
433f5bc1 | 918 | spin_unlock_bh(&sta->mesh->plink_lock); |
c7e67811 | 919 | if (action) { |
a69bd8e6 | 920 | mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
433f5bc1 JB |
921 | sta->mesh->llid, sta->mesh->plid, |
922 | sta->mesh->reason); | |
c7e67811 TP |
923 | |
924 | /* also send confirm in open case */ | |
925 | if (action == WLAN_SP_MESH_PEERING_OPEN) { | |
a69bd8e6 | 926 | mesh_plink_frame_tx(sdata, sta, |
c7e67811 | 927 | WLAN_SP_MESH_PEERING_CONFIRM, |
433f5bc1 JB |
928 | sta->sta.addr, sta->mesh->llid, |
929 | sta->mesh->plid, 0); | |
c7e67811 TP |
930 | } |
931 | } | |
932 | ||
933 | return changed; | |
934 | } | |
935 | ||
c99a89ed TP |
936 | /* |
937 | * mesh_plink_get_event - get correct MPM event | |
938 | * | |
939 | * @sdata: interface | |
940 | * @sta: peer, leave NULL if processing a frame from a new suitable peer | |
941 | * @elems: peering management IEs | |
942 | * @ftype: frame type | |
943 | * @llid: peer's peer link ID | |
944 | * @plid: peer's local link ID | |
945 | * | |
946 | * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as | |
947 | * an error. | |
948 | */ | |
949 | static enum plink_event | |
950 | mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, | |
951 | struct sta_info *sta, | |
952 | struct ieee802_11_elems *elems, | |
953 | enum ieee80211_self_protected_actioncode ftype, | |
6f101ef0 | 954 | u16 llid, u16 plid) |
c99a89ed TP |
955 | { |
956 | enum plink_event event = PLINK_UNDEFINED; | |
957 | u8 ie_len = elems->peering_len; | |
958 | bool matches_local; | |
959 | ||
960 | matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || | |
961 | mesh_matches_local(sdata, elems)); | |
962 | ||
963 | /* deny open request from non-matching peer */ | |
964 | if (!matches_local && !sta) { | |
965 | event = OPN_RJCT; | |
966 | goto out; | |
967 | } | |
968 | ||
969 | if (!sta) { | |
970 | if (ftype != WLAN_SP_MESH_PEERING_OPEN) { | |
971 | mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); | |
972 | goto out; | |
973 | } | |
974 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ | |
975 | if (!mesh_plink_free_count(sdata)) { | |
976 | mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); | |
977 | goto out; | |
978 | } | |
979 | } else { | |
980 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) { | |
981 | mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); | |
982 | goto out; | |
983 | } | |
433f5bc1 | 984 | if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED) |
c99a89ed TP |
985 | goto out; |
986 | } | |
987 | ||
988 | /* new matching peer */ | |
989 | if (!sta) { | |
990 | event = OPN_ACPT; | |
991 | goto out; | |
992 | } | |
993 | ||
994 | switch (ftype) { | |
995 | case WLAN_SP_MESH_PEERING_OPEN: | |
996 | if (!matches_local) | |
997 | event = OPN_RJCT; | |
998 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 | 999 | (sta->mesh->plid && sta->mesh->plid != plid)) |
c99a89ed TP |
1000 | event = OPN_IGNR; |
1001 | else | |
1002 | event = OPN_ACPT; | |
1003 | break; | |
1004 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
1005 | if (!matches_local) | |
1006 | event = CNF_RJCT; | |
1007 | if (!mesh_plink_free_count(sdata) || | |
433f5bc1 JB |
1008 | sta->mesh->llid != llid || |
1009 | (sta->mesh->plid && sta->mesh->plid != plid)) | |
c99a89ed TP |
1010 | event = CNF_IGNR; |
1011 | else | |
1012 | event = CNF_ACPT; | |
1013 | break; | |
1014 | case WLAN_SP_MESH_PEERING_CLOSE: | |
433f5bc1 | 1015 | if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
c99a89ed TP |
1016 | /* Do not check for llid or plid. This does not |
1017 | * follow the standard but since multiple plinks | |
1018 | * per sta are not supported, it is necessary in | |
1019 | * order to avoid a livelock when MP A sees an | |
1020 | * establish peer link to MP B but MP B does not | |
1021 | * see it. This can be caused by a timeout in | |
1022 | * B's peer link establishment or B beign | |
1023 | * restarted. | |
1024 | */ | |
1025 | event = CLS_ACPT; | |
433f5bc1 | 1026 | else if (sta->mesh->plid != plid) |
c99a89ed | 1027 | event = CLS_IGNR; |
433f5bc1 | 1028 | else if (ie_len == 8 && sta->mesh->llid != llid) |
c99a89ed TP |
1029 | event = CLS_IGNR; |
1030 | else | |
1031 | event = CLS_ACPT; | |
1032 | break; | |
1033 | default: | |
1034 | mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); | |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | out: | |
1039 | return event; | |
1040 | } | |
1041 | ||
05a23ae9 TP |
1042 | static void |
1043 | mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1044 | struct ieee80211_mgmt *mgmt, | |
1045 | struct ieee802_11_elems *elems) | |
c3896d2c | 1046 | { |
05a23ae9 | 1047 | |
c3896d2c LCC |
1048 | struct sta_info *sta; |
1049 | enum plink_event event; | |
54ef656b | 1050 | enum ieee80211_self_protected_actioncode ftype; |
57aac7c5 | 1051 | u32 changed = 0; |
c99a89ed | 1052 | u8 ie_len = elems->peering_len; |
6f101ef0 | 1053 | u16 plid, llid = 0; |
c3896d2c | 1054 | |
05a23ae9 | 1055 | if (!elems->peering) { |
bdcbd8e0 JB |
1056 | mpl_dbg(sdata, |
1057 | "Mesh plink: missing necessary peer link ie\n"); | |
c3896d2c LCC |
1058 | return; |
1059 | } | |
bf7cd94d | 1060 | |
05a23ae9 | 1061 | if (elems->rsn_len && |
bf7cd94d | 1062 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
bdcbd8e0 JB |
1063 | mpl_dbg(sdata, |
1064 | "Mesh plink: can't establish link with secure peer\n"); | |
5cff5e01 JC |
1065 | return; |
1066 | } | |
c3896d2c | 1067 | |
8db09850 | 1068 | ftype = mgmt->u.action.u.self_prot.action_code; |
8db09850 TP |
1069 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
1070 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
1071 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
1072 | && ie_len != 8)) { | |
bdcbd8e0 JB |
1073 | mpl_dbg(sdata, |
1074 | "Mesh plink: incorrect plink ie length %d %d\n", | |
1075 | ftype, ie_len); | |
c3896d2c LCC |
1076 | return; |
1077 | } | |
1078 | ||
54ef656b | 1079 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
05a23ae9 | 1080 | (!elems->mesh_id || !elems->mesh_config)) { |
bdcbd8e0 | 1081 | mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
c3896d2c LCC |
1082 | return; |
1083 | } | |
1084 | /* Note the lines below are correct, the llid in the frame is the plid | |
1085 | * from the point of view of this host. | |
1086 | */ | |
f8134fed | 1087 | plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
54ef656b | 1088 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
f8134fed BC |
1089 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
1090 | llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); | |
c3896d2c | 1091 | |
296fcba3 | 1092 | /* WARNING: Only for sta pointer, is dropped & re-acquired */ |
d0709a65 JB |
1093 | rcu_read_lock(); |
1094 | ||
abe60632 | 1095 | sta = sta_info_get(sdata, mgmt->sa); |
32cb05bf | 1096 | |
55335137 | 1097 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
36c9bb29 | 1098 | !rssi_threshold_check(sdata, sta)) { |
bdcbd8e0 | 1099 | mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 1100 | mgmt->sa); |
fc10302e | 1101 | goto unlock_rcu; |
55335137 AN |
1102 | } |
1103 | ||
c3896d2c | 1104 | /* Now we will figure out the appropriate event... */ |
c99a89ed | 1105 | event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
54ab1ffb TP |
1106 | |
1107 | if (event == OPN_ACPT) { | |
296fcba3 | 1108 | rcu_read_unlock(); |
54ab1ffb | 1109 | /* allocate sta entry if necessary and update info */ |
05a23ae9 | 1110 | sta = mesh_sta_info_get(sdata, mgmt->sa, elems); |
54ab1ffb | 1111 | if (!sta) { |
bdcbd8e0 | 1112 | mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
fc10302e | 1113 | goto unlock_rcu; |
54ab1ffb | 1114 | } |
433f5bc1 | 1115 | sta->mesh->plid = plid; |
c99a89ed | 1116 | } else if (!sta && event == OPN_RJCT) { |
a69bd8e6 | 1117 | mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE, |
c99a89ed | 1118 | mgmt->sa, 0, plid, |
6f101ef0 | 1119 | WLAN_REASON_MESH_CONFIG); |
c99a89ed TP |
1120 | goto unlock_rcu; |
1121 | } else if (!sta || event == PLINK_UNDEFINED) { | |
1122 | /* something went wrong */ | |
1123 | goto unlock_rcu; | |
c3896d2c LCC |
1124 | } |
1125 | ||
a69bd8e6 BC |
1126 | if (event == CNF_ACPT) { |
1127 | /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ | |
0e0060fc | 1128 | if (!sta->mesh->plid) |
a69bd8e6 | 1129 | sta->mesh->plid = plid; |
a69bd8e6 BC |
1130 | |
1131 | sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt)); | |
1132 | } | |
6c6fa496 | 1133 | |
c7e67811 | 1134 | changed |= mesh_plink_fsm(sdata, sta, event); |
d0709a65 | 1135 | |
fc10302e | 1136 | unlock_rcu: |
d0709a65 | 1137 | rcu_read_unlock(); |
57aac7c5 | 1138 | |
ecccd072 | 1139 | if (changed) |
2b5e1967 | 1140 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c | 1141 | } |
05a23ae9 TP |
1142 | |
1143 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1144 | struct ieee80211_mgmt *mgmt, size_t len, | |
1145 | struct ieee80211_rx_status *rx_status) | |
1146 | { | |
1147 | struct ieee802_11_elems elems; | |
1148 | size_t baselen; | |
1149 | u8 *baseaddr; | |
1150 | ||
1151 | /* need action_code, aux */ | |
1152 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
1153 | return; | |
1154 | ||
1155 | if (sdata->u.mesh.user_mpm) | |
1156 | /* userspace must register for these */ | |
1157 | return; | |
1158 | ||
1159 | if (is_multicast_ether_addr(mgmt->da)) { | |
1160 | mpl_dbg(sdata, | |
1161 | "Mesh plink: ignore frame from multicast address\n"); | |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | baseaddr = mgmt->u.action.u.self_prot.variable; | |
1166 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
1167 | if (mgmt->u.action.u.self_prot.action_code == | |
1168 | WLAN_SP_MESH_PEERING_CONFIRM) { | |
1169 | baseaddr += 4; | |
1170 | baselen += 4; | |
b3e7de87 BC |
1171 | |
1172 | if (baselen > len) | |
1173 | return; | |
05a23ae9 TP |
1174 | } |
1175 | ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems); | |
1176 | mesh_process_plink_frame(sdata, mgmt, &elems); | |
1177 | } |