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 | |
8db09850 TP |
16 | #define PLINK_GET_LLID(p) (p + 2) |
17 | #define PLINK_GET_PLID(p) (p + 4) | |
c3896d2c LCC |
18 | |
19 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ | |
cc57ac53 | 20 | jiffies + msecs_to_jiffies(t))) |
c3896d2c | 21 | |
c3896d2c LCC |
22 | enum plink_event { |
23 | PLINK_UNDEFINED, | |
24 | OPN_ACPT, | |
25 | OPN_RJCT, | |
26 | OPN_IGNR, | |
27 | CNF_ACPT, | |
28 | CNF_RJCT, | |
29 | CNF_IGNR, | |
30 | CLS_ACPT, | |
31 | CLS_IGNR | |
32 | }; | |
33 | ||
95e48add TP |
34 | static const char * const mplstates[] = { |
35 | [NL80211_PLINK_LISTEN] = "LISTEN", | |
36 | [NL80211_PLINK_OPN_SNT] = "OPN-SNT", | |
37 | [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", | |
38 | [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", | |
39 | [NL80211_PLINK_ESTAB] = "ESTAB", | |
40 | [NL80211_PLINK_HOLDING] = "HOLDING", | |
41 | [NL80211_PLINK_BLOCKED] = "BLOCKED" | |
42 | }; | |
43 | ||
44 | static const char * const mplevents[] = { | |
45 | [PLINK_UNDEFINED] = "NONE", | |
46 | [OPN_ACPT] = "OPN_ACPT", | |
47 | [OPN_RJCT] = "OPN_RJCT", | |
48 | [OPN_IGNR] = "OPN_IGNR", | |
49 | [CNF_ACPT] = "CNF_ACPT", | |
50 | [CNF_RJCT] = "CNF_RJCT", | |
51 | [CNF_IGNR] = "CNF_IGNR", | |
52 | [CLS_ACPT] = "CLS_ACPT", | |
53 | [CLS_IGNR] = "CLS_IGNR" | |
54 | }; | |
55 | ||
ba4a14e1 | 56 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 57 | enum ieee80211_self_protected_actioncode action, |
6f101ef0 | 58 | u8 *da, u16 llid, u16 plid, u16 reason); |
ba4a14e1 | 59 | |
36c9bb29 BC |
60 | |
61 | /* We only need a valid sta if user configured a minimum rssi_threshold. */ | |
62 | static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata, | |
63 | struct sta_info *sta) | |
64 | { | |
65 | s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold; | |
66 | return rssi_threshold == 0 || | |
67 | (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold); | |
68 | } | |
69 | ||
c3896d2c LCC |
70 | /** |
71 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine | |
72 | * | |
23c7a29c | 73 | * @sta: mesh peer link to restart |
c3896d2c | 74 | * |
07346f81 | 75 | * Locking: this function must be called holding sta->lock |
c3896d2c LCC |
76 | */ |
77 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) | |
78 | { | |
57cf8043 | 79 | sta->plink_state = NL80211_PLINK_LISTEN; |
37659ff8 LCC |
80 | sta->llid = sta->plid = sta->reason = 0; |
81 | sta->plink_retries = 0; | |
c3896d2c LCC |
82 | } |
83 | ||
3b144658 TP |
84 | /* |
85 | * mesh_set_short_slot_time - enable / disable ERP short slot time. | |
86 | * | |
87 | * The standard indirectly mandates mesh STAs to turn off short slot time by | |
88 | * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we | |
89 | * can't be sneaky about it. Enable short slot time if all mesh STAs in the | |
90 | * MBSS support ERP rates. | |
91 | * | |
92 | * Returns BSS_CHANGED_ERP_SLOT or 0 for no change. | |
93 | */ | |
94 | static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) | |
95 | { | |
96 | struct ieee80211_local *local = sdata->local; | |
97 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); | |
98 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; | |
99 | struct sta_info *sta; | |
100 | u32 erp_rates = 0, changed = 0; | |
101 | int i; | |
102 | bool short_slot = false; | |
103 | ||
104 | if (band == IEEE80211_BAND_5GHZ) { | |
105 | /* (IEEE 802.11-2012 19.4.5) */ | |
106 | short_slot = true; | |
107 | goto out; | |
108 | } else if (band != IEEE80211_BAND_2GHZ || | |
109 | (band == IEEE80211_BAND_2GHZ && | |
110 | local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) | |
111 | goto out; | |
112 | ||
113 | for (i = 0; i < sband->n_bitrates; i++) | |
114 | if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) | |
115 | erp_rates |= BIT(i); | |
116 | ||
117 | if (!erp_rates) | |
118 | goto out; | |
119 | ||
120 | rcu_read_lock(); | |
121 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
122 | if (sdata != sta->sdata || | |
123 | sta->plink_state != NL80211_PLINK_ESTAB) | |
124 | continue; | |
125 | ||
126 | short_slot = false; | |
127 | if (erp_rates & sta->sta.supp_rates[band]) | |
128 | short_slot = true; | |
129 | else | |
130 | break; | |
131 | } | |
132 | rcu_read_unlock(); | |
133 | ||
134 | out: | |
135 | if (sdata->vif.bss_conf.use_short_slot != short_slot) { | |
136 | sdata->vif.bss_conf.use_short_slot = short_slot; | |
137 | changed = BSS_CHANGED_ERP_SLOT; | |
138 | mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", | |
139 | sdata->vif.addr, short_slot); | |
140 | } | |
141 | return changed; | |
142 | } | |
143 | ||
2c53040f | 144 | /** |
cbf9322e | 145 | * mesh_set_ht_prot_mode - set correct HT protection mode |
57aac7c5 | 146 | * |
cbf9322e AN |
147 | * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT |
148 | * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT | |
149 | * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is | |
150 | * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode | |
151 | * is selected if all peers in our 20/40MHz MBSS support HT and atleast one | |
152 | * HT20 peer is present. Otherwise no-protection mode is selected. | |
57aac7c5 AN |
153 | */ |
154 | static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) | |
155 | { | |
156 | struct ieee80211_local *local = sdata->local; | |
157 | struct sta_info *sta; | |
57aac7c5 AN |
158 | u16 ht_opmode; |
159 | bool non_ht_sta = false, ht20_sta = false; | |
160 | ||
0418a445 SW |
161 | switch (sdata->vif.bss_conf.chandef.width) { |
162 | case NL80211_CHAN_WIDTH_20_NOHT: | |
163 | case NL80211_CHAN_WIDTH_5: | |
164 | case NL80211_CHAN_WIDTH_10: | |
57aac7c5 | 165 | return 0; |
0418a445 SW |
166 | default: |
167 | break; | |
168 | } | |
57aac7c5 AN |
169 | |
170 | rcu_read_lock(); | |
171 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
cbf9322e AN |
172 | if (sdata != sta->sdata || |
173 | sta->plink_state != NL80211_PLINK_ESTAB) | |
174 | continue; | |
175 | ||
52ac8c48 TP |
176 | if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20) |
177 | continue; | |
178 | ||
179 | if (!sta->sta.ht_cap.ht_supported) { | |
180 | mpl_dbg(sdata, "nonHT sta (%pM) is present\n", | |
181 | sta->sta.addr); | |
cbf9322e | 182 | non_ht_sta = true; |
cbf9322e | 183 | break; |
57aac7c5 | 184 | } |
52ac8c48 TP |
185 | |
186 | mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); | |
187 | ht20_sta = true; | |
57aac7c5 | 188 | } |
57aac7c5 AN |
189 | rcu_read_unlock(); |
190 | ||
191 | if (non_ht_sta) | |
192 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; | |
466f310d | 193 | else if (ht20_sta && |
4bf88530 | 194 | sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) |
57aac7c5 AN |
195 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; |
196 | else | |
197 | ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; | |
198 | ||
52ac8c48 TP |
199 | if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) |
200 | return 0; | |
57aac7c5 | 201 | |
52ac8c48 TP |
202 | sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
203 | sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; | |
204 | mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); | |
205 | return BSS_CHANGED_HT; | |
57aac7c5 AN |
206 | } |
207 | ||
c3896d2c | 208 | /** |
c9370197 | 209 | * __mesh_plink_deactivate - deactivate mesh peer link |
c3896d2c LCC |
210 | * |
211 | * @sta: mesh peer link to deactivate | |
212 | * | |
213 | * All mesh paths with this peer as next hop will be flushed | |
df323818 | 214 | * Returns beacon changed flag if the beacon content changed. |
c3896d2c | 215 | * |
07346f81 | 216 | * Locking: the caller must hold sta->lock |
c3896d2c | 217 | */ |
df323818 | 218 | static u32 __mesh_plink_deactivate(struct sta_info *sta) |
c3896d2c | 219 | { |
d0709a65 | 220 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
df323818 | 221 | u32 changed = 0; |
d0709a65 | 222 | |
df323818 MP |
223 | if (sta->plink_state == NL80211_PLINK_ESTAB) |
224 | changed = mesh_plink_dec_estab_count(sdata); | |
57cf8043 | 225 | sta->plink_state = NL80211_PLINK_BLOCKED; |
c3896d2c | 226 | mesh_path_flush_by_nexthop(sta); |
c9370197 | 227 | |
3f52b7e3 | 228 | ieee80211_mps_sta_status_update(sta); |
446075d7 MP |
229 | changed |= ieee80211_mps_set_sta_local_pm(sta, |
230 | NL80211_MESH_POWER_UNKNOWN); | |
3f52b7e3 | 231 | |
df323818 | 232 | return changed; |
c3896d2c LCC |
233 | } |
234 | ||
902acc78 | 235 | /** |
c9370197 | 236 | * mesh_plink_deactivate - deactivate mesh peer link |
902acc78 JB |
237 | * |
238 | * @sta: mesh peer link to deactivate | |
239 | * | |
240 | * All mesh paths with this peer as next hop will be flushed | |
241 | */ | |
45b5028e | 242 | u32 mesh_plink_deactivate(struct sta_info *sta) |
902acc78 | 243 | { |
c9370197 | 244 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
df323818 | 245 | u32 changed; |
c9370197 | 246 | |
07346f81 | 247 | spin_lock_bh(&sta->lock); |
df323818 | 248 | changed = __mesh_plink_deactivate(sta); |
6f101ef0 | 249 | sta->reason = WLAN_REASON_MESH_PEER_CANCELED; |
ba4a14e1 TP |
250 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, |
251 | sta->sta.addr, sta->llid, sta->plid, | |
252 | sta->reason); | |
07346f81 | 253 | spin_unlock_bh(&sta->lock); |
c9370197 | 254 | |
45b5028e | 255 | return changed; |
902acc78 JB |
256 | } |
257 | ||
f698d856 | 258 | static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 259 | enum ieee80211_self_protected_actioncode action, |
6f101ef0 | 260 | u8 *da, u16 llid, u16 plid, u16 reason) |
bf7cd94d | 261 | { |
f698d856 | 262 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 263 | struct sk_buff *skb; |
e7570dfb | 264 | struct ieee80211_tx_info *info; |
c3896d2c LCC |
265 | struct ieee80211_mgmt *mgmt; |
266 | bool include_plid = false; | |
8db09850 | 267 | u16 peering_proto = 0; |
3b69a9c5 TP |
268 | u8 *pos, ie_len = 4; |
269 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + | |
270 | sizeof(mgmt->u.action.u.self_prot); | |
f609a43d | 271 | int err = -ENOMEM; |
3b69a9c5 | 272 | |
65e8b0cc | 273 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
274 | hdr_len + |
275 | 2 + /* capability info */ | |
276 | 2 + /* AID */ | |
277 | 2 + 8 + /* supported rates */ | |
278 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
279 | 2 + sdata->u.mesh.mesh_id_len + | |
280 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
176f3608 | 281 | 2 + sizeof(struct ieee80211_ht_cap) + |
074d46d1 | 282 | 2 + sizeof(struct ieee80211_ht_operation) + |
3b69a9c5 TP |
283 | 2 + 8 + /* peering IE */ |
284 | sdata->u.mesh.ie_len); | |
c3896d2c | 285 | if (!skb) |
87d84c45 | 286 | return err; |
e7570dfb | 287 | info = IEEE80211_SKB_CB(skb); |
65e8b0cc | 288 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
289 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
290 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
291 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
292 | IEEE80211_STYPE_ACTION); | |
c3896d2c | 293 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 294 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
915b5c50 | 295 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
8db09850 TP |
296 | mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
297 | mgmt->u.action.u.self_prot.action_code = action; | |
c3896d2c | 298 | |
8db09850 | 299 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
55de908a JB |
300 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
301 | ||
8db09850 TP |
302 | /* capability info */ |
303 | pos = skb_put(skb, 2); | |
304 | memset(pos, 0, 2); | |
54ef656b | 305 | if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
8db09850 TP |
306 | /* AID */ |
307 | pos = skb_put(skb, 2); | |
6f101ef0 | 308 | put_unaligned_le16(plid, pos + 2); |
c3896d2c | 309 | } |
55de908a JB |
310 | if (ieee80211_add_srates_ie(sdata, skb, true, band) || |
311 | ieee80211_add_ext_srates_ie(sdata, skb, true, band) || | |
bf7cd94d JB |
312 | mesh_add_rsn_ie(sdata, skb) || |
313 | mesh_add_meshid_ie(sdata, skb) || | |
314 | mesh_add_meshconf_ie(sdata, skb)) | |
f609a43d | 315 | goto free; |
8db09850 | 316 | } else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
e7570dfb | 317 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
bf7cd94d | 318 | if (mesh_add_meshid_ie(sdata, skb)) |
f609a43d | 319 | goto free; |
c3896d2c LCC |
320 | } |
321 | ||
8db09850 | 322 | /* Add Mesh Peering Management element */ |
c3896d2c | 323 | switch (action) { |
54ef656b | 324 | case WLAN_SP_MESH_PEERING_OPEN: |
c3896d2c | 325 | break; |
54ef656b | 326 | case WLAN_SP_MESH_PEERING_CONFIRM: |
8db09850 | 327 | ie_len += 2; |
c3896d2c LCC |
328 | include_plid = true; |
329 | break; | |
54ef656b | 330 | case WLAN_SP_MESH_PEERING_CLOSE: |
8db09850 TP |
331 | if (plid) { |
332 | ie_len += 2; | |
c3896d2c LCC |
333 | include_plid = true; |
334 | } | |
8db09850 | 335 | ie_len += 2; /* reason code */ |
c3896d2c | 336 | break; |
8db09850 | 337 | default: |
f609a43d TP |
338 | err = -EINVAL; |
339 | goto free; | |
c3896d2c LCC |
340 | } |
341 | ||
8db09850 | 342 | if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
f609a43d | 343 | goto free; |
8db09850 | 344 | |
c3896d2c | 345 | pos = skb_put(skb, 2 + ie_len); |
8db09850 | 346 | *pos++ = WLAN_EID_PEER_MGMT; |
c3896d2c | 347 | *pos++ = ie_len; |
8db09850 TP |
348 | memcpy(pos, &peering_proto, 2); |
349 | pos += 2; | |
6f101ef0 | 350 | put_unaligned_le16(llid, pos); |
8db09850 | 351 | pos += 2; |
c3896d2c | 352 | if (include_plid) { |
6f101ef0 | 353 | put_unaligned_le16(plid, pos); |
8db09850 | 354 | pos += 2; |
c3896d2c | 355 | } |
54ef656b | 356 | if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
6f101ef0 | 357 | put_unaligned_le16(reason, pos); |
8db09850 | 358 | pos += 2; |
c3896d2c | 359 | } |
176f3608 TP |
360 | |
361 | if (action != WLAN_SP_MESH_PEERING_CLOSE) { | |
bf7cd94d JB |
362 | if (mesh_add_ht_cap_ie(sdata, skb) || |
363 | mesh_add_ht_oper_ie(sdata, skb)) | |
f609a43d | 364 | goto free; |
176f3608 TP |
365 | } |
366 | ||
bf7cd94d | 367 | if (mesh_add_vendor_ies(sdata, skb)) |
f609a43d | 368 | goto free; |
c3896d2c | 369 | |
62ae67be | 370 | ieee80211_tx_skb(sdata, skb); |
c3896d2c | 371 | return 0; |
f609a43d TP |
372 | free: |
373 | kfree_skb(skb); | |
374 | return err; | |
c3896d2c LCC |
375 | } |
376 | ||
296fcba3 TP |
377 | static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
378 | struct sta_info *sta, | |
379 | struct ieee802_11_elems *elems, bool insert) | |
c3896d2c | 380 | { |
f698d856 | 381 | struct ieee80211_local *local = sdata->local; |
55de908a | 382 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
54ab1ffb | 383 | struct ieee80211_supported_band *sband; |
f68d776a | 384 | u32 rates, basic_rates = 0, changed = 0; |
abcff6ef | 385 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
c3896d2c | 386 | |
f743ff49 | 387 | sband = local->hw.wiphy->bands[band]; |
2103dec1 | 388 | rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates); |
d0709a65 | 389 | |
54ab1ffb | 390 | spin_lock_bh(&sta->lock); |
c3896d2c | 391 | sta->last_rx = jiffies; |
296fcba3 TP |
392 | |
393 | /* rates and capabilities don't change during peering */ | |
394 | if (sta->plink_state == NL80211_PLINK_ESTAB) | |
395 | goto out; | |
bae35d92 | 396 | |
f68d776a TP |
397 | if (sta->sta.supp_rates[band] != rates) |
398 | changed |= IEEE80211_RC_SUPP_RATES_CHANGED; | |
f743ff49 | 399 | sta->sta.supp_rates[band] = rates; |
54ab1ffb | 400 | |
52ac8c48 TP |
401 | if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
402 | elems->ht_cap_elem, sta)) | |
403 | changed |= IEEE80211_RC_BW_CHANGED; | |
4bf88530 | 404 | |
abcff6ef JD |
405 | if (bw != sta->sta.bandwidth) |
406 | changed |= IEEE80211_RC_BW_CHANGED; | |
407 | ||
52ac8c48 TP |
408 | /* HT peer is operating 20MHz-only */ |
409 | if (elems->ht_operation && | |
410 | !(elems->ht_operation->ht_param & | |
411 | IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
412 | if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) | |
f68d776a | 413 | changed |= IEEE80211_RC_BW_CHANGED; |
52ac8c48 | 414 | sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; |
57aac7c5 | 415 | } |
c7d25828 | 416 | |
59cf1d65 HS |
417 | if (insert) |
418 | rate_control_rate_init(sta); | |
f68d776a TP |
419 | else |
420 | rate_control_rate_update(local, sband, sta, changed); | |
296fcba3 | 421 | out: |
54ab1ffb | 422 | spin_unlock_bh(&sta->lock); |
296fcba3 TP |
423 | } |
424 | ||
425 | static struct sta_info * | |
426 | __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) | |
427 | { | |
428 | struct sta_info *sta; | |
54ab1ffb | 429 | |
296fcba3 | 430 | if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
e87278e7 TP |
431 | return NULL; |
432 | ||
296fcba3 TP |
433 | sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
434 | if (!sta) | |
435 | return NULL; | |
436 | ||
437 | sta->plink_state = NL80211_PLINK_LISTEN; | |
a74a8c84 | 438 | sta->sta.wme = true; |
296fcba3 TP |
439 | |
440 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); | |
441 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
442 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
443 | ||
296fcba3 TP |
444 | return sta; |
445 | } | |
446 | ||
447 | static struct sta_info * | |
448 | mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, | |
449 | struct ieee802_11_elems *elems) | |
450 | { | |
451 | struct sta_info *sta = NULL; | |
452 | ||
a6dad6a2 TP |
453 | /* Userspace handles station allocation */ |
454 | if (sdata->u.mesh.user_mpm || | |
455 | sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) | |
296fcba3 TP |
456 | cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
457 | elems->ie_start, | |
458 | elems->total_len, | |
459 | GFP_KERNEL); | |
460 | else | |
461 | sta = __mesh_sta_info_alloc(sdata, addr); | |
462 | ||
54ab1ffb TP |
463 | return sta; |
464 | } | |
465 | ||
296fcba3 TP |
466 | /* |
467 | * mesh_sta_info_get - return mesh sta info entry for @addr. | |
468 | * | |
469 | * @sdata: local meshif | |
470 | * @addr: peer's address | |
471 | * @elems: IEs from beacon or mesh peering frame. | |
472 | * | |
473 | * Return existing or newly allocated sta_info under RCU read lock. | |
474 | * (re)initialize with given IEs. | |
475 | */ | |
476 | static struct sta_info * | |
477 | mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, | |
478 | u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU) | |
479 | { | |
480 | struct sta_info *sta = NULL; | |
481 | ||
482 | rcu_read_lock(); | |
483 | sta = sta_info_get(sdata, addr); | |
484 | if (sta) { | |
485 | mesh_sta_info_init(sdata, sta, elems, false); | |
486 | } else { | |
487 | rcu_read_unlock(); | |
488 | /* can't run atomic */ | |
489 | sta = mesh_sta_info_alloc(sdata, addr, elems); | |
490 | if (!sta) { | |
491 | rcu_read_lock(); | |
492 | return NULL; | |
493 | } | |
494 | ||
3b4797bc TP |
495 | mesh_sta_info_init(sdata, sta, elems, true); |
496 | ||
296fcba3 TP |
497 | if (sta_info_insert_rcu(sta)) |
498 | return NULL; | |
499 | } | |
500 | ||
501 | return sta; | |
502 | } | |
503 | ||
504 | /* | |
505 | * mesh_neighbour_update - update or initialize new mesh neighbor. | |
506 | * | |
507 | * @sdata: local meshif | |
508 | * @addr: peer's address | |
509 | * @elems: IEs from beacon or mesh peering frame | |
510 | * | |
511 | * Initiates peering if appropriate. | |
512 | */ | |
f743ff49 TP |
513 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
514 | u8 *hw_addr, | |
54ab1ffb TP |
515 | struct ieee802_11_elems *elems) |
516 | { | |
517 | struct sta_info *sta; | |
39886b61 | 518 | u32 changed = 0; |
54ab1ffb | 519 | |
296fcba3 | 520 | sta = mesh_sta_info_get(sdata, hw_addr, elems); |
54ab1ffb TP |
521 | if (!sta) |
522 | goto out; | |
523 | ||
1570ca59 | 524 | if (mesh_peer_accepts_plinks(elems) && |
54ab1ffb TP |
525 | sta->plink_state == NL80211_PLINK_LISTEN && |
526 | sdata->u.mesh.accepting_plinks && | |
527 | sdata->u.mesh.mshcfg.auto_open_plinks && | |
36c9bb29 | 528 | rssi_threshold_check(sdata, sta)) |
39886b61 | 529 | changed = mesh_plink_open(sta); |
c3896d2c | 530 | |
3f52b7e3 | 531 | ieee80211_mps_frame_release(sta, elems); |
54ab1ffb | 532 | out: |
d0709a65 | 533 | rcu_read_unlock(); |
2b5e1967 | 534 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c LCC |
535 | } |
536 | ||
537 | static void mesh_plink_timer(unsigned long data) | |
538 | { | |
539 | struct sta_info *sta; | |
6f101ef0 | 540 | u16 reason = 0; |
c3896d2c | 541 | struct ieee80211_sub_if_data *sdata; |
453e66f2 | 542 | struct mesh_config *mshcfg; |
4efec451 | 543 | enum ieee80211_self_protected_actioncode action = 0; |
c3896d2c | 544 | |
d0709a65 JB |
545 | /* |
546 | * This STA is valid because sta_info_destroy() will | |
547 | * del_timer_sync() this timer after having made sure | |
548 | * it cannot be readded (by deleting the plink.) | |
549 | */ | |
c3896d2c LCC |
550 | sta = (struct sta_info *) data; |
551 | ||
690205f1 | 552 | if (sta->sdata->local->quiescing) |
5bb644a0 | 553 | return; |
5bb644a0 | 554 | |
07346f81 | 555 | spin_lock_bh(&sta->lock); |
2b470c39 BC |
556 | |
557 | /* If a timer fires just before a state transition on another CPU, | |
558 | * we may have already extended the timeout and changed state by the | |
559 | * time we've acquired the lock and arrived here. In that case, | |
560 | * skip this timer and wait for the new one. | |
561 | */ | |
562 | if (time_before(jiffies, sta->plink_timer.expires)) { | |
563 | mpl_dbg(sta->sdata, | |
564 | "Ignoring timer for %pM in state %s (timer adjusted)", | |
565 | sta->sta.addr, mplstates[sta->plink_state]); | |
07346f81 | 566 | spin_unlock_bh(&sta->lock); |
c3896d2c LCC |
567 | return; |
568 | } | |
2b470c39 BC |
569 | |
570 | /* del_timer() and handler may race when entering these states */ | |
571 | if (sta->plink_state == NL80211_PLINK_LISTEN || | |
572 | sta->plink_state == NL80211_PLINK_ESTAB) { | |
573 | mpl_dbg(sta->sdata, | |
574 | "Ignoring timer for %pM in state %s (timer deleted)", | |
575 | sta->sta.addr, mplstates[sta->plink_state]); | |
576 | spin_unlock_bh(&sta->lock); | |
577 | return; | |
578 | } | |
579 | ||
bdcbd8e0 | 580 | mpl_dbg(sta->sdata, |
3088f7d2 TP |
581 | "Mesh plink timer for %pM fired on state %s\n", |
582 | sta->sta.addr, mplstates[sta->plink_state]); | |
d0709a65 | 583 | sdata = sta->sdata; |
453e66f2 | 584 | mshcfg = &sdata->u.mesh.mshcfg; |
c3896d2c LCC |
585 | |
586 | switch (sta->plink_state) { | |
57cf8043 JC |
587 | case NL80211_PLINK_OPN_RCVD: |
588 | case NL80211_PLINK_OPN_SNT: | |
c3896d2c | 589 | /* retry timer */ |
453e66f2 | 590 | if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) { |
c3896d2c | 591 | u32 rand; |
bdcbd8e0 JB |
592 | mpl_dbg(sta->sdata, |
593 | "Mesh plink for %pM (retry, timeout): %d %d\n", | |
0c68ae26 JB |
594 | sta->sta.addr, sta->plink_retries, |
595 | sta->plink_timeout); | |
c3896d2c LCC |
596 | get_random_bytes(&rand, sizeof(u32)); |
597 | sta->plink_timeout = sta->plink_timeout + | |
598 | rand % sta->plink_timeout; | |
599 | ++sta->plink_retries; | |
d0709a65 | 600 | mod_plink_timer(sta, sta->plink_timeout); |
4efec451 | 601 | action = WLAN_SP_MESH_PEERING_OPEN; |
c3896d2c LCC |
602 | break; |
603 | } | |
6f101ef0 | 604 | reason = WLAN_REASON_MESH_MAX_RETRIES; |
c3896d2c | 605 | /* fall through on else */ |
57cf8043 | 606 | case NL80211_PLINK_CNF_RCVD: |
c3896d2c LCC |
607 | /* confirm timer */ |
608 | if (!reason) | |
6f101ef0 | 609 | reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; |
57cf8043 | 610 | sta->plink_state = NL80211_PLINK_HOLDING; |
453e66f2 | 611 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
4efec451 | 612 | action = WLAN_SP_MESH_PEERING_CLOSE; |
c3896d2c | 613 | break; |
57cf8043 | 614 | case NL80211_PLINK_HOLDING: |
c3896d2c | 615 | /* holding timer */ |
d0709a65 | 616 | del_timer(&sta->plink_timer); |
c3896d2c | 617 | mesh_plink_fsm_restart(sta); |
c3896d2c LCC |
618 | break; |
619 | default: | |
c3896d2c LCC |
620 | break; |
621 | } | |
0f5ffd24 | 622 | spin_unlock_bh(&sta->lock); |
4efec451 TP |
623 | if (action) |
624 | mesh_plink_frame_tx(sdata, action, sta->sta.addr, | |
6f101ef0 | 625 | sta->llid, sta->plid, reason); |
c3896d2c LCC |
626 | } |
627 | ||
0df2f6c1 | 628 | static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
c3896d2c | 629 | { |
cc57ac53 | 630 | sta->plink_timer.expires = jiffies + msecs_to_jiffies(timeout); |
c3896d2c LCC |
631 | sta->plink_timer.data = (unsigned long) sta; |
632 | sta->plink_timer.function = mesh_plink_timer; | |
633 | sta->plink_timeout = timeout; | |
c3896d2c LCC |
634 | add_timer(&sta->plink_timer); |
635 | } | |
636 | ||
204d1304 | 637 | static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
6f101ef0 | 638 | u16 llid) |
204d1304 TP |
639 | { |
640 | struct ieee80211_local *local = sdata->local; | |
641 | bool in_use = false; | |
642 | struct sta_info *sta; | |
643 | ||
644 | rcu_read_lock(); | |
645 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
646 | if (!memcmp(&sta->llid, &llid, sizeof(llid))) { | |
647 | in_use = true; | |
648 | break; | |
649 | } | |
650 | } | |
651 | rcu_read_unlock(); | |
652 | ||
653 | return in_use; | |
654 | } | |
655 | ||
6f101ef0 | 656 | static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
204d1304 TP |
657 | { |
658 | u16 llid; | |
659 | ||
660 | do { | |
661 | get_random_bytes(&llid, sizeof(llid)); | |
662 | /* for mesh PS we still only have the AID range for TIM bits */ | |
663 | llid = (llid % IEEE80211_MAX_AID) + 1; | |
6f101ef0 | 664 | } while (llid_in_use(sdata, llid)); |
204d1304 | 665 | |
6f101ef0 | 666 | return llid; |
204d1304 TP |
667 | } |
668 | ||
39886b61 | 669 | u32 mesh_plink_open(struct sta_info *sta) |
c3896d2c | 670 | { |
d0709a65 | 671 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
39886b61 | 672 | u32 changed; |
c3896d2c | 673 | |
c2c98fde | 674 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
39886b61 | 675 | return 0; |
53e80511 | 676 | |
07346f81 | 677 | spin_lock_bh(&sta->lock); |
204d1304 | 678 | sta->llid = mesh_get_new_llid(sdata); |
9385d04f CYY |
679 | if (sta->plink_state != NL80211_PLINK_LISTEN && |
680 | sta->plink_state != NL80211_PLINK_BLOCKED) { | |
07346f81 | 681 | spin_unlock_bh(&sta->lock); |
39886b61 | 682 | return 0; |
c3896d2c | 683 | } |
57cf8043 | 684 | sta->plink_state = NL80211_PLINK_OPN_SNT; |
453e66f2 | 685 | mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
07346f81 | 686 | spin_unlock_bh(&sta->lock); |
bdcbd8e0 JB |
687 | mpl_dbg(sdata, |
688 | "Mesh plink: starting establishment with %pM\n", | |
0c68ae26 | 689 | sta->sta.addr); |
c3896d2c | 690 | |
3f52b7e3 | 691 | /* set the non-peer mode to active during peering */ |
39886b61 | 692 | changed = ieee80211_mps_local_status_update(sdata); |
3f52b7e3 | 693 | |
39886b61 | 694 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, |
204d1304 | 695 | sta->sta.addr, sta->llid, 0, 0); |
39886b61 | 696 | return changed; |
c3896d2c LCC |
697 | } |
698 | ||
39886b61 | 699 | u32 mesh_plink_block(struct sta_info *sta) |
c3896d2c | 700 | { |
df323818 | 701 | u32 changed; |
c9370197 | 702 | |
07346f81 | 703 | spin_lock_bh(&sta->lock); |
df323818 | 704 | changed = __mesh_plink_deactivate(sta); |
57cf8043 | 705 | sta->plink_state = NL80211_PLINK_BLOCKED; |
07346f81 | 706 | spin_unlock_bh(&sta->lock); |
c9370197 | 707 | |
39886b61 | 708 | return changed; |
c3896d2c LCC |
709 | } |
710 | ||
e76d67f0 BC |
711 | static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
712 | struct sta_info *sta, | |
713 | enum plink_event event) | |
714 | { | |
715 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
716 | ||
6f101ef0 CYY |
717 | u16 reason = (event == CLS_ACPT) ? |
718 | WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; | |
e76d67f0 BC |
719 | |
720 | sta->reason = reason; | |
721 | sta->plink_state = NL80211_PLINK_HOLDING; | |
272a9e26 | 722 | mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
e76d67f0 BC |
723 | } |
724 | ||
725 | static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, | |
726 | struct sta_info *sta) | |
727 | { | |
728 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
729 | u32 changed = 0; | |
730 | ||
731 | del_timer(&sta->plink_timer); | |
732 | sta->plink_state = NL80211_PLINK_ESTAB; | |
733 | changed |= mesh_plink_inc_estab_count(sdata); | |
734 | changed |= mesh_set_ht_prot_mode(sdata); | |
735 | changed |= mesh_set_short_slot_time(sdata); | |
736 | mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); | |
737 | ieee80211_mps_sta_status_update(sta); | |
738 | changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); | |
739 | return changed; | |
740 | } | |
741 | ||
c7e67811 TP |
742 | /** |
743 | * mesh_plink_fsm - step @sta MPM based on @event | |
744 | * | |
745 | * @sdata: interface | |
746 | * @sta: mesh neighbor | |
747 | * @event: peering event | |
748 | * | |
749 | * Return: changed MBSS flags | |
750 | */ | |
751 | static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, | |
752 | struct sta_info *sta, enum plink_event event) | |
753 | { | |
754 | struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; | |
755 | enum ieee80211_self_protected_actioncode action = 0; | |
756 | u32 changed = 0; | |
757 | ||
758 | mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, | |
759 | mplstates[sta->plink_state], mplevents[event]); | |
760 | ||
761 | spin_lock_bh(&sta->lock); | |
762 | switch (sta->plink_state) { | |
763 | case NL80211_PLINK_LISTEN: | |
764 | switch (event) { | |
765 | case CLS_ACPT: | |
766 | mesh_plink_fsm_restart(sta); | |
767 | break; | |
768 | case OPN_ACPT: | |
769 | sta->plink_state = NL80211_PLINK_OPN_RCVD; | |
204d1304 | 770 | sta->llid = mesh_get_new_llid(sdata); |
c7e67811 TP |
771 | mesh_plink_timer_set(sta, |
772 | mshcfg->dot11MeshRetryTimeout); | |
773 | ||
774 | /* set the non-peer mode to active during peering */ | |
775 | changed |= ieee80211_mps_local_status_update(sdata); | |
776 | action = WLAN_SP_MESH_PEERING_OPEN; | |
777 | break; | |
778 | default: | |
779 | break; | |
780 | } | |
781 | break; | |
782 | case NL80211_PLINK_OPN_SNT: | |
783 | switch (event) { | |
784 | case OPN_RJCT: | |
785 | case CNF_RJCT: | |
786 | case CLS_ACPT: | |
787 | mesh_plink_close(sdata, sta, event); | |
788 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
789 | break; | |
790 | case OPN_ACPT: | |
791 | /* retry timer is left untouched */ | |
792 | sta->plink_state = NL80211_PLINK_OPN_RCVD; | |
793 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
794 | break; | |
795 | case CNF_ACPT: | |
796 | sta->plink_state = NL80211_PLINK_CNF_RCVD; | |
2b470c39 | 797 | mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
c7e67811 TP |
798 | break; |
799 | default: | |
800 | break; | |
801 | } | |
802 | break; | |
803 | case NL80211_PLINK_OPN_RCVD: | |
804 | switch (event) { | |
805 | case OPN_RJCT: | |
806 | case CNF_RJCT: | |
807 | case CLS_ACPT: | |
808 | mesh_plink_close(sdata, sta, event); | |
809 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
810 | break; | |
811 | case OPN_ACPT: | |
812 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
813 | break; | |
814 | case CNF_ACPT: | |
815 | changed |= mesh_plink_establish(sdata, sta); | |
816 | break; | |
817 | default: | |
818 | break; | |
819 | } | |
820 | break; | |
821 | case NL80211_PLINK_CNF_RCVD: | |
822 | switch (event) { | |
823 | case OPN_RJCT: | |
824 | case CNF_RJCT: | |
825 | case CLS_ACPT: | |
826 | mesh_plink_close(sdata, sta, event); | |
827 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
828 | break; | |
829 | case OPN_ACPT: | |
830 | changed |= mesh_plink_establish(sdata, sta); | |
831 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
832 | break; | |
833 | default: | |
834 | break; | |
835 | } | |
836 | break; | |
837 | case NL80211_PLINK_ESTAB: | |
838 | switch (event) { | |
839 | case CLS_ACPT: | |
840 | changed |= __mesh_plink_deactivate(sta); | |
841 | changed |= mesh_set_ht_prot_mode(sdata); | |
842 | changed |= mesh_set_short_slot_time(sdata); | |
843 | mesh_plink_close(sdata, sta, event); | |
844 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
845 | break; | |
846 | case OPN_ACPT: | |
847 | action = WLAN_SP_MESH_PEERING_CONFIRM; | |
848 | break; | |
849 | default: | |
850 | break; | |
851 | } | |
852 | break; | |
853 | case NL80211_PLINK_HOLDING: | |
854 | switch (event) { | |
855 | case CLS_ACPT: | |
2b470c39 | 856 | del_timer(&sta->plink_timer); |
c7e67811 TP |
857 | mesh_plink_fsm_restart(sta); |
858 | break; | |
859 | case OPN_ACPT: | |
860 | case CNF_ACPT: | |
861 | case OPN_RJCT: | |
862 | case CNF_RJCT: | |
863 | action = WLAN_SP_MESH_PEERING_CLOSE; | |
864 | break; | |
865 | default: | |
866 | break; | |
867 | } | |
868 | break; | |
869 | default: | |
870 | /* should not get here, PLINK_BLOCKED is dealt with at the | |
871 | * beginning of the function | |
872 | */ | |
873 | break; | |
874 | } | |
875 | spin_unlock_bh(&sta->lock); | |
876 | if (action) { | |
877 | mesh_plink_frame_tx(sdata, action, sta->sta.addr, | |
878 | sta->llid, sta->plid, sta->reason); | |
879 | ||
880 | /* also send confirm in open case */ | |
881 | if (action == WLAN_SP_MESH_PEERING_OPEN) { | |
882 | mesh_plink_frame_tx(sdata, | |
883 | WLAN_SP_MESH_PEERING_CONFIRM, | |
884 | sta->sta.addr, sta->llid, | |
885 | sta->plid, 0); | |
886 | } | |
887 | } | |
888 | ||
889 | return changed; | |
890 | } | |
891 | ||
c99a89ed TP |
892 | /* |
893 | * mesh_plink_get_event - get correct MPM event | |
894 | * | |
895 | * @sdata: interface | |
896 | * @sta: peer, leave NULL if processing a frame from a new suitable peer | |
897 | * @elems: peering management IEs | |
898 | * @ftype: frame type | |
899 | * @llid: peer's peer link ID | |
900 | * @plid: peer's local link ID | |
901 | * | |
902 | * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as | |
903 | * an error. | |
904 | */ | |
905 | static enum plink_event | |
906 | mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, | |
907 | struct sta_info *sta, | |
908 | struct ieee802_11_elems *elems, | |
909 | enum ieee80211_self_protected_actioncode ftype, | |
6f101ef0 | 910 | u16 llid, u16 plid) |
c99a89ed TP |
911 | { |
912 | enum plink_event event = PLINK_UNDEFINED; | |
913 | u8 ie_len = elems->peering_len; | |
914 | bool matches_local; | |
915 | ||
916 | matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || | |
917 | mesh_matches_local(sdata, elems)); | |
918 | ||
919 | /* deny open request from non-matching peer */ | |
920 | if (!matches_local && !sta) { | |
921 | event = OPN_RJCT; | |
922 | goto out; | |
923 | } | |
924 | ||
925 | if (!sta) { | |
926 | if (ftype != WLAN_SP_MESH_PEERING_OPEN) { | |
927 | mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); | |
928 | goto out; | |
929 | } | |
930 | /* ftype == WLAN_SP_MESH_PEERING_OPEN */ | |
931 | if (!mesh_plink_free_count(sdata)) { | |
932 | mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); | |
933 | goto out; | |
934 | } | |
935 | } else { | |
936 | if (!test_sta_flag(sta, WLAN_STA_AUTH)) { | |
937 | mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); | |
938 | goto out; | |
939 | } | |
940 | if (sta->plink_state == NL80211_PLINK_BLOCKED) | |
941 | goto out; | |
942 | } | |
943 | ||
944 | /* new matching peer */ | |
945 | if (!sta) { | |
946 | event = OPN_ACPT; | |
947 | goto out; | |
948 | } | |
949 | ||
950 | switch (ftype) { | |
951 | case WLAN_SP_MESH_PEERING_OPEN: | |
952 | if (!matches_local) | |
953 | event = OPN_RJCT; | |
954 | if (!mesh_plink_free_count(sdata) || | |
955 | (sta->plid && sta->plid != plid)) | |
956 | event = OPN_IGNR; | |
957 | else | |
958 | event = OPN_ACPT; | |
959 | break; | |
960 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
961 | if (!matches_local) | |
962 | event = CNF_RJCT; | |
963 | if (!mesh_plink_free_count(sdata) || | |
6c6fa496 BC |
964 | sta->llid != llid || |
965 | (sta->plid && sta->plid != plid)) | |
c99a89ed TP |
966 | event = CNF_IGNR; |
967 | else | |
968 | event = CNF_ACPT; | |
969 | break; | |
970 | case WLAN_SP_MESH_PEERING_CLOSE: | |
971 | if (sta->plink_state == NL80211_PLINK_ESTAB) | |
972 | /* Do not check for llid or plid. This does not | |
973 | * follow the standard but since multiple plinks | |
974 | * per sta are not supported, it is necessary in | |
975 | * order to avoid a livelock when MP A sees an | |
976 | * establish peer link to MP B but MP B does not | |
977 | * see it. This can be caused by a timeout in | |
978 | * B's peer link establishment or B beign | |
979 | * restarted. | |
980 | */ | |
981 | event = CLS_ACPT; | |
982 | else if (sta->plid != plid) | |
983 | event = CLS_IGNR; | |
984 | else if (ie_len == 8 && sta->llid != llid) | |
985 | event = CLS_IGNR; | |
986 | else | |
987 | event = CLS_ACPT; | |
988 | break; | |
989 | default: | |
990 | mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); | |
991 | break; | |
992 | } | |
993 | ||
994 | out: | |
995 | return event; | |
996 | } | |
997 | ||
05a23ae9 TP |
998 | static void |
999 | mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1000 | struct ieee80211_mgmt *mgmt, | |
1001 | struct ieee802_11_elems *elems) | |
c3896d2c | 1002 | { |
05a23ae9 | 1003 | |
c3896d2c LCC |
1004 | struct sta_info *sta; |
1005 | enum plink_event event; | |
54ef656b | 1006 | enum ieee80211_self_protected_actioncode ftype; |
57aac7c5 | 1007 | u32 changed = 0; |
c99a89ed | 1008 | u8 ie_len = elems->peering_len; |
6f101ef0 | 1009 | u16 plid, llid = 0; |
c3896d2c | 1010 | |
05a23ae9 | 1011 | if (!elems->peering) { |
bdcbd8e0 JB |
1012 | mpl_dbg(sdata, |
1013 | "Mesh plink: missing necessary peer link ie\n"); | |
c3896d2c LCC |
1014 | return; |
1015 | } | |
bf7cd94d | 1016 | |
05a23ae9 | 1017 | if (elems->rsn_len && |
bf7cd94d | 1018 | sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
bdcbd8e0 JB |
1019 | mpl_dbg(sdata, |
1020 | "Mesh plink: can't establish link with secure peer\n"); | |
5cff5e01 JC |
1021 | return; |
1022 | } | |
c3896d2c | 1023 | |
8db09850 | 1024 | ftype = mgmt->u.action.u.self_prot.action_code; |
8db09850 TP |
1025 | if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
1026 | (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || | |
1027 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 | |
1028 | && ie_len != 8)) { | |
bdcbd8e0 JB |
1029 | mpl_dbg(sdata, |
1030 | "Mesh plink: incorrect plink ie length %d %d\n", | |
1031 | ftype, ie_len); | |
c3896d2c LCC |
1032 | return; |
1033 | } | |
1034 | ||
54ef656b | 1035 | if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
05a23ae9 | 1036 | (!elems->mesh_id || !elems->mesh_config)) { |
bdcbd8e0 | 1037 | mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
c3896d2c LCC |
1038 | return; |
1039 | } | |
1040 | /* Note the lines below are correct, the llid in the frame is the plid | |
1041 | * from the point of view of this host. | |
1042 | */ | |
f8134fed | 1043 | plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
54ef656b | 1044 | if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
f8134fed BC |
1045 | (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
1046 | llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); | |
c3896d2c | 1047 | |
296fcba3 | 1048 | /* WARNING: Only for sta pointer, is dropped & re-acquired */ |
d0709a65 JB |
1049 | rcu_read_lock(); |
1050 | ||
abe60632 | 1051 | sta = sta_info_get(sdata, mgmt->sa); |
32cb05bf | 1052 | |
55335137 | 1053 | if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
36c9bb29 | 1054 | !rssi_threshold_check(sdata, sta)) { |
bdcbd8e0 | 1055 | mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
3d4f9699 | 1056 | mgmt->sa); |
fc10302e | 1057 | goto unlock_rcu; |
55335137 AN |
1058 | } |
1059 | ||
c3896d2c | 1060 | /* Now we will figure out the appropriate event... */ |
c99a89ed | 1061 | event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
54ab1ffb TP |
1062 | |
1063 | if (event == OPN_ACPT) { | |
296fcba3 | 1064 | rcu_read_unlock(); |
54ab1ffb | 1065 | /* allocate sta entry if necessary and update info */ |
05a23ae9 | 1066 | sta = mesh_sta_info_get(sdata, mgmt->sa, elems); |
54ab1ffb | 1067 | if (!sta) { |
bdcbd8e0 | 1068 | mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
fc10302e | 1069 | goto unlock_rcu; |
54ab1ffb | 1070 | } |
5bbdd6c6 | 1071 | sta->plid = plid; |
c99a89ed TP |
1072 | } else if (!sta && event == OPN_RJCT) { |
1073 | mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, | |
1074 | mgmt->sa, 0, plid, | |
6f101ef0 | 1075 | WLAN_REASON_MESH_CONFIG); |
c99a89ed TP |
1076 | goto unlock_rcu; |
1077 | } else if (!sta || event == PLINK_UNDEFINED) { | |
1078 | /* something went wrong */ | |
1079 | goto unlock_rcu; | |
c3896d2c LCC |
1080 | } |
1081 | ||
6c6fa496 BC |
1082 | /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ |
1083 | if (!sta->plid && event == CNF_ACPT) | |
1084 | sta->plid = plid; | |
1085 | ||
c7e67811 | 1086 | changed |= mesh_plink_fsm(sdata, sta, event); |
d0709a65 | 1087 | |
fc10302e | 1088 | unlock_rcu: |
d0709a65 | 1089 | rcu_read_unlock(); |
57aac7c5 | 1090 | |
ecccd072 | 1091 | if (changed) |
2b5e1967 | 1092 | ieee80211_mbss_info_change_notify(sdata, changed); |
c3896d2c | 1093 | } |
05a23ae9 TP |
1094 | |
1095 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, | |
1096 | struct ieee80211_mgmt *mgmt, size_t len, | |
1097 | struct ieee80211_rx_status *rx_status) | |
1098 | { | |
1099 | struct ieee802_11_elems elems; | |
1100 | size_t baselen; | |
1101 | u8 *baseaddr; | |
1102 | ||
1103 | /* need action_code, aux */ | |
1104 | if (len < IEEE80211_MIN_ACTION_SIZE + 3) | |
1105 | return; | |
1106 | ||
1107 | if (sdata->u.mesh.user_mpm) | |
1108 | /* userspace must register for these */ | |
1109 | return; | |
1110 | ||
1111 | if (is_multicast_ether_addr(mgmt->da)) { | |
1112 | mpl_dbg(sdata, | |
1113 | "Mesh plink: ignore frame from multicast address\n"); | |
1114 | return; | |
1115 | } | |
1116 | ||
1117 | baseaddr = mgmt->u.action.u.self_prot.variable; | |
1118 | baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; | |
1119 | if (mgmt->u.action.u.self_prot.action_code == | |
1120 | WLAN_SP_MESH_PEERING_CONFIRM) { | |
1121 | baseaddr += 4; | |
1122 | baselen += 4; | |
1123 | } | |
1124 | ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems); | |
1125 | mesh_process_plink_frame(sdata, mgmt, &elems); | |
1126 | } |