Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1 | /* |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 2 | * Scanning implementation |
| 3 | * |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 5 | * Copyright 2004, Instant802 Networks, Inc. |
| 6 | * Copyright 2005, Devicescape Software, Inc. |
| 7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 15 | /* TODO: |
| 16 | * order BSS list by RSSI(?) ("quality of AP") |
| 17 | * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE, |
| 18 | * SSID) |
| 19 | */ |
| 20 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 21 | #include <linux/wireless.h> |
| 22 | #include <linux/if_arp.h> |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 23 | #include <linux/rtnetlink.h> |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 24 | #include <net/mac80211.h> |
| 25 | #include <net/iw_handler.h> |
| 26 | |
| 27 | #include "ieee80211_i.h" |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 28 | #include "mesh.h" |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 29 | |
| 30 | #define IEEE80211_PROBE_DELAY (HZ / 33) |
| 31 | #define IEEE80211_CHANNEL_TIME (HZ / 33) |
| 32 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) |
| 33 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 34 | void ieee80211_rx_bss_list_init(struct ieee80211_local *local) |
| 35 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 36 | spin_lock_init(&local->bss_lock); |
| 37 | INIT_LIST_HEAD(&local->bss_list); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local) |
| 41 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 42 | struct ieee80211_bss *bss, *tmp; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 43 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 44 | list_for_each_entry_safe(bss, tmp, &local->bss_list, list) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 45 | ieee80211_rx_bss_put(local, bss); |
| 46 | } |
| 47 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 48 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 49 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
| 50 | u8 *ssid, u8 ssid_len) |
| 51 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 52 | struct ieee80211_bss *bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 53 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 54 | spin_lock_bh(&local->bss_lock); |
| 55 | bss = local->bss_hash[STA_HASH(bssid)]; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 56 | while (bss) { |
| 57 | if (!bss_mesh_cfg(bss) && |
| 58 | !memcmp(bss->bssid, bssid, ETH_ALEN) && |
| 59 | bss->freq == freq && |
| 60 | bss->ssid_len == ssid_len && |
| 61 | (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) { |
| 62 | atomic_inc(&bss->users); |
| 63 | break; |
| 64 | } |
| 65 | bss = bss->hnext; |
| 66 | } |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 67 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 68 | return bss; |
| 69 | } |
| 70 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 71 | /* Caller must hold local->bss_lock */ |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 72 | static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 73 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 74 | { |
| 75 | u8 hash_idx; |
| 76 | |
| 77 | if (bss_mesh_cfg(bss)) |
| 78 | hash_idx = mesh_id_hash(bss_mesh_id(bss), |
| 79 | bss_mesh_id_len(bss)); |
| 80 | else |
| 81 | hash_idx = STA_HASH(bss->bssid); |
| 82 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 83 | bss->hnext = local->bss_hash[hash_idx]; |
| 84 | local->bss_hash[hash_idx] = bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 85 | } |
| 86 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 87 | /* Caller must hold local->bss_lock */ |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 88 | static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 89 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 90 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 91 | struct ieee80211_bss *b, *prev = NULL; |
| 92 | b = local->bss_hash[STA_HASH(bss->bssid)]; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 93 | while (b) { |
| 94 | if (b == bss) { |
| 95 | if (!prev) |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 96 | local->bss_hash[STA_HASH(bss->bssid)] = |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 97 | bss->hnext; |
| 98 | else |
| 99 | prev->hnext = bss->hnext; |
| 100 | break; |
| 101 | } |
| 102 | prev = b; |
| 103 | b = b->hnext; |
| 104 | } |
| 105 | } |
| 106 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 107 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 108 | ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq, |
| 109 | u8 *ssid, u8 ssid_len) |
| 110 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 111 | struct ieee80211_bss *bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 112 | |
| 113 | bss = kzalloc(sizeof(*bss), GFP_ATOMIC); |
| 114 | if (!bss) |
| 115 | return NULL; |
| 116 | atomic_set(&bss->users, 2); |
| 117 | memcpy(bss->bssid, bssid, ETH_ALEN); |
| 118 | bss->freq = freq; |
| 119 | if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) { |
| 120 | memcpy(bss->ssid, ssid, ssid_len); |
| 121 | bss->ssid_len = ssid_len; |
| 122 | } |
| 123 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 124 | spin_lock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 125 | /* TODO: order by RSSI? */ |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 126 | list_add_tail(&bss->list, &local->bss_list); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 127 | __ieee80211_rx_bss_hash_add(local, bss); |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 128 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 129 | return bss; |
| 130 | } |
| 131 | |
| 132 | #ifdef CONFIG_MAC80211_MESH |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 133 | static struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 134 | ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len, |
| 135 | u8 *mesh_cfg, int freq) |
| 136 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 137 | struct ieee80211_bss *bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 138 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 139 | spin_lock_bh(&local->bss_lock); |
| 140 | bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)]; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 141 | while (bss) { |
| 142 | if (bss_mesh_cfg(bss) && |
| 143 | !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) && |
| 144 | bss->freq == freq && |
| 145 | mesh_id_len == bss->mesh_id_len && |
| 146 | (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id, |
| 147 | mesh_id_len))) { |
| 148 | atomic_inc(&bss->users); |
| 149 | break; |
| 150 | } |
| 151 | bss = bss->hnext; |
| 152 | } |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 153 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 154 | return bss; |
| 155 | } |
| 156 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 157 | static struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 158 | ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len, |
| 159 | u8 *mesh_cfg, int mesh_config_len, int freq) |
| 160 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 161 | struct ieee80211_bss *bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 162 | |
Johannes Berg | 1239cd5 | 2008-10-28 11:12:57 +0100 | [diff] [blame] | 163 | if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 164 | return NULL; |
| 165 | |
| 166 | bss = kzalloc(sizeof(*bss), GFP_ATOMIC); |
| 167 | if (!bss) |
| 168 | return NULL; |
| 169 | |
| 170 | bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC); |
| 171 | if (!bss->mesh_cfg) { |
| 172 | kfree(bss); |
| 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) { |
| 177 | bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC); |
| 178 | if (!bss->mesh_id) { |
| 179 | kfree(bss->mesh_cfg); |
| 180 | kfree(bss); |
| 181 | return NULL; |
| 182 | } |
| 183 | memcpy(bss->mesh_id, mesh_id, mesh_id_len); |
| 184 | } |
| 185 | |
| 186 | atomic_set(&bss->users, 2); |
| 187 | memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN); |
| 188 | bss->mesh_id_len = mesh_id_len; |
| 189 | bss->freq = freq; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 190 | spin_lock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 191 | /* TODO: order by RSSI? */ |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 192 | list_add_tail(&bss->list, &local->bss_list); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 193 | __ieee80211_rx_bss_hash_add(local, bss); |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 194 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 195 | return bss; |
| 196 | } |
| 197 | #endif |
| 198 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 199 | static void ieee80211_rx_bss_free(struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 200 | { |
| 201 | kfree(bss->ies); |
| 202 | kfree(bss_mesh_id(bss)); |
| 203 | kfree(bss_mesh_cfg(bss)); |
| 204 | kfree(bss); |
| 205 | } |
| 206 | |
| 207 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 208 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 209 | { |
| 210 | local_bh_disable(); |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 211 | if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) { |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 212 | local_bh_enable(); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | __ieee80211_rx_bss_hash_del(local, bss); |
| 217 | list_del(&bss->list); |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 218 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 219 | ieee80211_rx_bss_free(bss); |
| 220 | } |
| 221 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 222 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 223 | ieee80211_bss_info_update(struct ieee80211_local *local, |
| 224 | struct ieee80211_rx_status *rx_status, |
| 225 | struct ieee80211_mgmt *mgmt, |
| 226 | size_t len, |
| 227 | struct ieee802_11_elems *elems, |
| 228 | int freq, bool beacon) |
| 229 | { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 230 | struct ieee80211_bss *bss; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 231 | int clen; |
| 232 | |
| 233 | #ifdef CONFIG_MAC80211_MESH |
| 234 | if (elems->mesh_config) |
| 235 | bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id, |
| 236 | elems->mesh_id_len, elems->mesh_config, freq); |
| 237 | else |
| 238 | #endif |
| 239 | bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq, |
| 240 | elems->ssid, elems->ssid_len); |
| 241 | if (!bss) { |
| 242 | #ifdef CONFIG_MAC80211_MESH |
| 243 | if (elems->mesh_config) |
| 244 | bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id, |
| 245 | elems->mesh_id_len, elems->mesh_config, |
| 246 | elems->mesh_config_len, freq); |
| 247 | else |
| 248 | #endif |
| 249 | bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq, |
| 250 | elems->ssid, elems->ssid_len); |
| 251 | if (!bss) |
| 252 | return NULL; |
| 253 | } else { |
| 254 | #if 0 |
| 255 | /* TODO: order by RSSI? */ |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 256 | spin_lock_bh(&local->bss_lock); |
| 257 | list_move_tail(&bss->list, &local->bss_list); |
| 258 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 259 | #endif |
| 260 | } |
| 261 | |
| 262 | /* save the ERP value so that it is available at association time */ |
| 263 | if (elems->erp_info && elems->erp_info_len >= 1) { |
| 264 | bss->erp_value = elems->erp_info[0]; |
| 265 | bss->has_erp_value = 1; |
| 266 | } |
| 267 | |
| 268 | bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int); |
| 269 | bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info); |
| 270 | |
| 271 | if (elems->tim) { |
| 272 | struct ieee80211_tim_ie *tim_ie = |
| 273 | (struct ieee80211_tim_ie *)elems->tim; |
| 274 | bss->dtim_period = tim_ie->dtim_period; |
| 275 | } |
| 276 | |
| 277 | /* set default value for buggy APs */ |
| 278 | if (!elems->tim || bss->dtim_period == 0) |
| 279 | bss->dtim_period = 1; |
| 280 | |
| 281 | bss->supp_rates_len = 0; |
| 282 | if (elems->supp_rates) { |
| 283 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; |
| 284 | if (clen > elems->supp_rates_len) |
| 285 | clen = elems->supp_rates_len; |
| 286 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, |
| 287 | clen); |
| 288 | bss->supp_rates_len += clen; |
| 289 | } |
| 290 | if (elems->ext_supp_rates) { |
| 291 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; |
| 292 | if (clen > elems->ext_supp_rates_len) |
| 293 | clen = elems->ext_supp_rates_len; |
| 294 | memcpy(&bss->supp_rates[bss->supp_rates_len], |
| 295 | elems->ext_supp_rates, clen); |
| 296 | bss->supp_rates_len += clen; |
| 297 | } |
| 298 | |
| 299 | bss->band = rx_status->band; |
| 300 | |
| 301 | bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); |
| 302 | bss->last_update = jiffies; |
| 303 | bss->signal = rx_status->signal; |
| 304 | bss->noise = rx_status->noise; |
| 305 | bss->qual = rx_status->qual; |
| 306 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
| 307 | |
| 308 | if (!beacon) |
| 309 | bss->last_probe_resp = jiffies; |
| 310 | |
| 311 | /* |
| 312 | * For probe responses, or if we don't have any information yet, |
| 313 | * use the IEs from the beacon. |
| 314 | */ |
| 315 | if (!bss->ies || !beacon) { |
| 316 | if (bss->ies == NULL || bss->ies_len < elems->total_len) { |
| 317 | kfree(bss->ies); |
| 318 | bss->ies = kmalloc(elems->total_len, GFP_ATOMIC); |
| 319 | } |
| 320 | if (bss->ies) { |
| 321 | memcpy(bss->ies, elems->ie_start, elems->total_len); |
| 322 | bss->ies_len = elems->total_len; |
| 323 | } else |
| 324 | bss->ies_len = 0; |
| 325 | } |
| 326 | |
| 327 | return bss; |
| 328 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 329 | |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 330 | ieee80211_rx_result |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 331 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
| 332 | struct ieee80211_rx_status *rx_status) |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 333 | { |
| 334 | struct ieee80211_mgmt *mgmt; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 335 | struct ieee80211_bss *bss; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 336 | u8 *elements; |
| 337 | struct ieee80211_channel *channel; |
| 338 | size_t baselen; |
| 339 | int freq; |
| 340 | __le16 fc; |
| 341 | bool presp, beacon = false; |
| 342 | struct ieee802_11_elems elems; |
| 343 | |
| 344 | if (skb->len < 2) |
| 345 | return RX_DROP_UNUSABLE; |
| 346 | |
| 347 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 348 | fc = mgmt->frame_control; |
| 349 | |
| 350 | if (ieee80211_is_ctl(fc)) |
| 351 | return RX_CONTINUE; |
| 352 | |
| 353 | if (skb->len < 24) |
| 354 | return RX_DROP_MONITOR; |
| 355 | |
| 356 | presp = ieee80211_is_probe_resp(fc); |
| 357 | if (presp) { |
| 358 | /* ignore ProbeResp to foreign address */ |
| 359 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) |
| 360 | return RX_DROP_MONITOR; |
| 361 | |
| 362 | presp = true; |
| 363 | elements = mgmt->u.probe_resp.variable; |
| 364 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); |
| 365 | } else { |
| 366 | beacon = ieee80211_is_beacon(fc); |
| 367 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| 368 | elements = mgmt->u.beacon.variable; |
| 369 | } |
| 370 | |
| 371 | if (!presp && !beacon) |
| 372 | return RX_CONTINUE; |
| 373 | |
| 374 | if (baselen > skb->len) |
| 375 | return RX_DROP_MONITOR; |
| 376 | |
| 377 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); |
| 378 | |
| 379 | if (elems.ds_params && elems.ds_params_len == 1) |
| 380 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); |
| 381 | else |
| 382 | freq = rx_status->freq; |
| 383 | |
| 384 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); |
| 385 | |
| 386 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| 387 | return RX_DROP_MONITOR; |
| 388 | |
| 389 | bss = ieee80211_bss_info_update(sdata->local, rx_status, |
| 390 | mgmt, skb->len, &elems, |
| 391 | freq, beacon); |
Jouni Malinen | d048e50 | 2008-10-11 03:29:55 +0300 | [diff] [blame] | 392 | if (bss) |
| 393 | ieee80211_rx_bss_put(sdata->local, bss); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 394 | |
| 395 | dev_kfree_skb(skb); |
| 396 | return RX_QUEUED; |
| 397 | } |
| 398 | |
Vivek Natarajan | a97b77b | 2008-12-23 18:39:02 -0800 | [diff] [blame] | 399 | void ieee80211_send_nullfunc(struct ieee80211_local *local, |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 400 | struct ieee80211_sub_if_data *sdata, |
| 401 | int powersave) |
| 402 | { |
| 403 | struct sk_buff *skb; |
| 404 | struct ieee80211_hdr *nullfunc; |
| 405 | __le16 fc; |
| 406 | |
| 407 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); |
| 408 | if (!skb) { |
| 409 | printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " |
| 410 | "frame\n", sdata->dev->name); |
| 411 | return; |
| 412 | } |
| 413 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 414 | |
| 415 | nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); |
| 416 | memset(nullfunc, 0, 24); |
| 417 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | |
| 418 | IEEE80211_FCTL_TODS); |
| 419 | if (powersave) |
| 420 | fc |= cpu_to_le16(IEEE80211_FCTL_PM); |
| 421 | nullfunc->frame_control = fc; |
| 422 | memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); |
| 423 | memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); |
| 424 | memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); |
| 425 | |
Johannes Berg | e50db65 | 2008-09-09 15:07:09 +0200 | [diff] [blame] | 426 | ieee80211_tx_skb(sdata, skb, 0); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 427 | } |
| 428 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 429 | void ieee80211_scan_completed(struct ieee80211_hw *hw) |
| 430 | { |
| 431 | struct ieee80211_local *local = hw_to_local(hw); |
| 432 | struct ieee80211_sub_if_data *sdata; |
| 433 | union iwreq_data wrqu; |
| 434 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 435 | if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 436 | return; |
| 437 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 438 | local->last_scan_completed = jiffies; |
| 439 | memset(&wrqu, 0, sizeof(wrqu)); |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 440 | |
| 441 | /* |
| 442 | * local->scan_sdata could have been NULLed by the interface |
| 443 | * down code in case we were scanning on an interface that is |
| 444 | * being taken down. |
| 445 | */ |
| 446 | sdata = local->scan_sdata; |
| 447 | if (sdata) |
| 448 | wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 449 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 450 | if (local->hw_scanning) { |
| 451 | local->hw_scanning = false; |
Johannes Berg | e897558 | 2008-10-09 12:18:51 +0200 | [diff] [blame] | 452 | /* |
| 453 | * Somebody might have requested channel change during scan |
| 454 | * that we won't have acted upon, try now. ieee80211_hw_config |
| 455 | * will set the flag based on actual changes. |
| 456 | */ |
| 457 | ieee80211_hw_config(local, 0); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 458 | goto done; |
| 459 | } |
| 460 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 461 | local->sw_scanning = false; |
Johannes Berg | e897558 | 2008-10-09 12:18:51 +0200 | [diff] [blame] | 462 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 463 | |
| 464 | netif_tx_lock_bh(local->mdev); |
| 465 | netif_addr_lock(local->mdev); |
| 466 | local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; |
| 467 | local->ops->configure_filter(local_to_hw(local), |
| 468 | FIF_BCN_PRBRESP_PROMISC, |
| 469 | &local->filter_flags, |
| 470 | local->mdev->mc_count, |
| 471 | local->mdev->mc_list); |
| 472 | |
| 473 | netif_addr_unlock(local->mdev); |
| 474 | netif_tx_unlock_bh(local->mdev); |
| 475 | |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 476 | mutex_lock(&local->iflist_mtx); |
| 477 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | fb9ddbf | 2009-01-26 19:11:57 +0100 | [diff] [blame] | 478 | if (!netif_running(sdata->dev)) |
| 479 | continue; |
| 480 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 481 | /* Tell AP we're back */ |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 482 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 483 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { |
| 484 | ieee80211_send_nullfunc(local, sdata, 0); |
| 485 | netif_tx_wake_all_queues(sdata->dev); |
| 486 | } |
| 487 | } else |
| 488 | netif_tx_wake_all_queues(sdata->dev); |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 489 | |
| 490 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 491 | } |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 492 | mutex_unlock(&local->iflist_mtx); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 493 | |
| 494 | done: |
| 495 | ieee80211_mlme_notify_scan_completed(local); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 496 | ieee80211_mesh_notify_scan_completed(local); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 497 | } |
| 498 | EXPORT_SYMBOL(ieee80211_scan_completed); |
| 499 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 500 | void ieee80211_scan_work(struct work_struct *work) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 501 | { |
| 502 | struct ieee80211_local *local = |
| 503 | container_of(work, struct ieee80211_local, scan_work.work); |
| 504 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; |
| 505 | struct ieee80211_supported_band *sband; |
| 506 | struct ieee80211_channel *chan; |
| 507 | int skip; |
| 508 | unsigned long next_delay = 0; |
| 509 | |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 510 | /* |
| 511 | * Avoid re-scheduling when the sdata is going away. |
| 512 | */ |
| 513 | if (!netif_running(sdata->dev)) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 514 | return; |
| 515 | |
| 516 | switch (local->scan_state) { |
| 517 | case SCAN_SET_CHANNEL: |
| 518 | /* |
| 519 | * Get current scan band. scan_band may be IEEE80211_NUM_BANDS |
| 520 | * after we successfully scanned the last channel of the last |
| 521 | * band (and the last band is supported by the hw) |
| 522 | */ |
| 523 | if (local->scan_band < IEEE80211_NUM_BANDS) |
| 524 | sband = local->hw.wiphy->bands[local->scan_band]; |
| 525 | else |
| 526 | sband = NULL; |
| 527 | |
| 528 | /* |
| 529 | * If we are at an unsupported band and have more bands |
| 530 | * left to scan, advance to the next supported one. |
| 531 | */ |
| 532 | while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { |
| 533 | local->scan_band++; |
| 534 | sband = local->hw.wiphy->bands[local->scan_band]; |
| 535 | local->scan_channel_idx = 0; |
| 536 | } |
| 537 | |
| 538 | /* if no more bands/channels left, complete scan */ |
| 539 | if (!sband || local->scan_channel_idx >= sband->n_channels) { |
| 540 | ieee80211_scan_completed(local_to_hw(local)); |
| 541 | return; |
| 542 | } |
| 543 | skip = 0; |
| 544 | chan = &sband->channels[local->scan_channel_idx]; |
| 545 | |
| 546 | if (chan->flags & IEEE80211_CHAN_DISABLED || |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 547 | (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 548 | chan->flags & IEEE80211_CHAN_NO_IBSS)) |
| 549 | skip = 1; |
| 550 | |
| 551 | if (!skip) { |
| 552 | local->scan_channel = chan; |
Johannes Berg | e897558 | 2008-10-09 12:18:51 +0200 | [diff] [blame] | 553 | if (ieee80211_hw_config(local, |
| 554 | IEEE80211_CONF_CHANGE_CHANNEL)) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 555 | skip = 1; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | /* advance state machine to next channel/band */ |
| 559 | local->scan_channel_idx++; |
| 560 | if (local->scan_channel_idx >= sband->n_channels) { |
| 561 | /* |
| 562 | * scan_band may end up == IEEE80211_NUM_BANDS, but |
| 563 | * we'll catch that case above and complete the scan |
| 564 | * if that is the case. |
| 565 | */ |
| 566 | local->scan_band++; |
| 567 | local->scan_channel_idx = 0; |
| 568 | } |
| 569 | |
| 570 | if (skip) |
| 571 | break; |
| 572 | |
| 573 | next_delay = IEEE80211_PROBE_DELAY + |
| 574 | usecs_to_jiffies(local->hw.channel_change_time); |
| 575 | local->scan_state = SCAN_SEND_PROBE; |
| 576 | break; |
| 577 | case SCAN_SEND_PROBE: |
| 578 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
| 579 | local->scan_state = SCAN_SET_CHANNEL; |
| 580 | |
| 581 | if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) |
| 582 | break; |
| 583 | ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, |
| 584 | local->scan_ssid_len); |
| 585 | next_delay = IEEE80211_CHANNEL_TIME; |
| 586 | break; |
| 587 | } |
| 588 | |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 589 | queue_delayed_work(local->hw.workqueue, &local->scan_work, |
| 590 | next_delay); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 594 | int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, |
| 595 | u8 *ssid, size_t ssid_len) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 596 | { |
| 597 | struct ieee80211_local *local = scan_sdata->local; |
| 598 | struct ieee80211_sub_if_data *sdata; |
| 599 | |
| 600 | if (ssid_len > IEEE80211_MAX_SSID_LEN) |
| 601 | return -EINVAL; |
| 602 | |
| 603 | /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) |
| 604 | * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS |
| 605 | * BSSID: MACAddress |
| 606 | * SSID |
| 607 | * ScanType: ACTIVE, PASSIVE |
| 608 | * ProbeDelay: delay (in microseconds) to be used prior to transmitting |
| 609 | * a Probe frame during active scanning |
| 610 | * ChannelList |
| 611 | * MinChannelTime (>= ProbeDelay), in TU |
| 612 | * MaxChannelTime: (>= MinChannelTime), in TU |
| 613 | */ |
| 614 | |
| 615 | /* MLME-SCAN.confirm |
| 616 | * BSSDescriptionSet |
| 617 | * ResultCode: SUCCESS, INVALID_PARAMETERS |
| 618 | */ |
| 619 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 620 | if (local->sw_scanning || local->hw_scanning) { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 621 | if (local->scan_sdata == scan_sdata) |
| 622 | return 0; |
| 623 | return -EBUSY; |
| 624 | } |
| 625 | |
| 626 | if (local->ops->hw_scan) { |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 627 | int rc; |
| 628 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 629 | local->hw_scanning = true; |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 630 | rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len); |
| 631 | if (rc) { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 632 | local->hw_scanning = false; |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 633 | return rc; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 634 | } |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 635 | local->scan_sdata = scan_sdata; |
| 636 | return 0; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 637 | } |
| 638 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 639 | local->sw_scanning = true; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 640 | |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 641 | mutex_lock(&local->iflist_mtx); |
| 642 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | fb9ddbf | 2009-01-26 19:11:57 +0100 | [diff] [blame] | 643 | if (!netif_running(sdata->dev)) |
| 644 | continue; |
| 645 | |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 646 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED); |
| 647 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 648 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 649 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { |
| 650 | netif_tx_stop_all_queues(sdata->dev); |
| 651 | ieee80211_send_nullfunc(local, sdata, 1); |
| 652 | } |
| 653 | } else |
| 654 | netif_tx_stop_all_queues(sdata->dev); |
| 655 | } |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 656 | mutex_unlock(&local->iflist_mtx); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 657 | |
| 658 | if (ssid) { |
| 659 | local->scan_ssid_len = ssid_len; |
| 660 | memcpy(local->scan_ssid, ssid, ssid_len); |
| 661 | } else |
| 662 | local->scan_ssid_len = 0; |
| 663 | local->scan_state = SCAN_SET_CHANNEL; |
| 664 | local->scan_channel_idx = 0; |
| 665 | local->scan_band = IEEE80211_BAND_2GHZ; |
| 666 | local->scan_sdata = scan_sdata; |
| 667 | |
| 668 | netif_addr_lock_bh(local->mdev); |
| 669 | local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; |
| 670 | local->ops->configure_filter(local_to_hw(local), |
| 671 | FIF_BCN_PRBRESP_PROMISC, |
| 672 | &local->filter_flags, |
| 673 | local->mdev->mc_count, |
| 674 | local->mdev->mc_list); |
| 675 | netif_addr_unlock_bh(local->mdev); |
| 676 | |
| 677 | /* TODO: start scan as soon as all nullfunc frames are ACKed */ |
| 678 | queue_delayed_work(local->hw.workqueue, &local->scan_work, |
| 679 | IEEE80211_CHANNEL_TIME); |
| 680 | |
| 681 | return 0; |
| 682 | } |
| 683 | |
| 684 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 685 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
| 686 | u8 *ssid, size_t ssid_len) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 687 | { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 688 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 9116dd0 | 2008-09-08 17:47:23 +0200 | [diff] [blame] | 689 | struct ieee80211_if_sta *ifsta; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 690 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 691 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 692 | return ieee80211_start_scan(sdata, ssid, ssid_len); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 693 | |
Johannes Berg | 9116dd0 | 2008-09-08 17:47:23 +0200 | [diff] [blame] | 694 | /* |
| 695 | * STA has a state machine that might need to defer scanning |
| 696 | * while it's trying to associate/authenticate, therefore we |
| 697 | * queue it up to the state machine in that case. |
| 698 | */ |
| 699 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 700 | if (local->sw_scanning || local->hw_scanning) { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 701 | if (local->scan_sdata == sdata) |
| 702 | return 0; |
| 703 | return -EBUSY; |
| 704 | } |
| 705 | |
Johannes Berg | 9116dd0 | 2008-09-08 17:47:23 +0200 | [diff] [blame] | 706 | ifsta = &sdata->u.sta; |
| 707 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 708 | ifsta->scan_ssid_len = ssid_len; |
| 709 | if (ssid_len) |
| 710 | memcpy(ifsta->scan_ssid, ssid, ssid_len); |
| 711 | set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); |
| 712 | queue_work(local->hw.workqueue, &ifsta->work); |
Johannes Berg | 9116dd0 | 2008-09-08 17:47:23 +0200 | [diff] [blame] | 713 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 718 | static void ieee80211_scan_add_ies(struct iw_request_info *info, |
| 719 | struct ieee80211_bss *bss, |
| 720 | char **current_ev, char *end_buf) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 721 | { |
| 722 | u8 *pos, *end, *next; |
| 723 | struct iw_event iwe; |
| 724 | |
| 725 | if (bss == NULL || bss->ies == NULL) |
| 726 | return; |
| 727 | |
| 728 | /* |
| 729 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
| 730 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
| 731 | */ |
| 732 | pos = bss->ies; |
| 733 | end = pos + bss->ies_len; |
| 734 | |
| 735 | while (end - pos > IW_GENERIC_IE_MAX) { |
| 736 | next = pos + 2 + pos[1]; |
| 737 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
| 738 | next = next + 2 + next[1]; |
| 739 | |
| 740 | memset(&iwe, 0, sizeof(iwe)); |
| 741 | iwe.cmd = IWEVGENIE; |
| 742 | iwe.u.data.length = next - pos; |
| 743 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 744 | end_buf, &iwe, pos); |
| 745 | |
| 746 | pos = next; |
| 747 | } |
| 748 | |
| 749 | if (end > pos) { |
| 750 | memset(&iwe, 0, sizeof(iwe)); |
| 751 | iwe.cmd = IWEVGENIE; |
| 752 | iwe.u.data.length = end - pos; |
| 753 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 754 | end_buf, &iwe, pos); |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | |
| 759 | static char * |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 760 | ieee80211_scan_result(struct ieee80211_local *local, |
| 761 | struct iw_request_info *info, |
| 762 | struct ieee80211_bss *bss, |
| 763 | char *current_ev, char *end_buf) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 764 | { |
| 765 | struct iw_event iwe; |
| 766 | char *buf; |
| 767 | |
| 768 | if (time_after(jiffies, |
| 769 | bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) |
| 770 | return current_ev; |
| 771 | |
| 772 | memset(&iwe, 0, sizeof(iwe)); |
| 773 | iwe.cmd = SIOCGIWAP; |
| 774 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
| 775 | memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN); |
| 776 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 777 | IW_EV_ADDR_LEN); |
| 778 | |
| 779 | memset(&iwe, 0, sizeof(iwe)); |
| 780 | iwe.cmd = SIOCGIWESSID; |
| 781 | if (bss_mesh_cfg(bss)) { |
| 782 | iwe.u.data.length = bss_mesh_id_len(bss); |
| 783 | iwe.u.data.flags = 1; |
| 784 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 785 | &iwe, bss_mesh_id(bss)); |
| 786 | } else { |
| 787 | iwe.u.data.length = bss->ssid_len; |
| 788 | iwe.u.data.flags = 1; |
| 789 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 790 | &iwe, bss->ssid); |
| 791 | } |
| 792 | |
| 793 | if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) |
| 794 | || bss_mesh_cfg(bss)) { |
| 795 | memset(&iwe, 0, sizeof(iwe)); |
| 796 | iwe.cmd = SIOCGIWMODE; |
| 797 | if (bss_mesh_cfg(bss)) |
| 798 | iwe.u.mode = IW_MODE_MESH; |
| 799 | else if (bss->capability & WLAN_CAPABILITY_ESS) |
| 800 | iwe.u.mode = IW_MODE_MASTER; |
| 801 | else |
| 802 | iwe.u.mode = IW_MODE_ADHOC; |
| 803 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 804 | &iwe, IW_EV_UINT_LEN); |
| 805 | } |
| 806 | |
| 807 | memset(&iwe, 0, sizeof(iwe)); |
| 808 | iwe.cmd = SIOCGIWFREQ; |
| 809 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq); |
| 810 | iwe.u.freq.e = 0; |
| 811 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 812 | IW_EV_FREQ_LEN); |
| 813 | |
| 814 | memset(&iwe, 0, sizeof(iwe)); |
| 815 | iwe.cmd = SIOCGIWFREQ; |
| 816 | iwe.u.freq.m = bss->freq; |
| 817 | iwe.u.freq.e = 6; |
| 818 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 819 | IW_EV_FREQ_LEN); |
| 820 | memset(&iwe, 0, sizeof(iwe)); |
| 821 | iwe.cmd = IWEVQUAL; |
| 822 | iwe.u.qual.qual = bss->qual; |
| 823 | iwe.u.qual.level = bss->signal; |
| 824 | iwe.u.qual.noise = bss->noise; |
| 825 | iwe.u.qual.updated = local->wstats_flags; |
| 826 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 827 | IW_EV_QUAL_LEN); |
| 828 | |
| 829 | memset(&iwe, 0, sizeof(iwe)); |
| 830 | iwe.cmd = SIOCGIWENCODE; |
| 831 | if (bss->capability & WLAN_CAPABILITY_PRIVACY) |
| 832 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
| 833 | else |
| 834 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
| 835 | iwe.u.data.length = 0; |
| 836 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 837 | &iwe, ""); |
| 838 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 839 | ieee80211_scan_add_ies(info, bss, ¤t_ev, end_buf); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 840 | |
| 841 | if (bss->supp_rates_len > 0) { |
| 842 | /* display all supported rates in readable format */ |
| 843 | char *p = current_ev + iwe_stream_lcp_len(info); |
| 844 | int i; |
| 845 | |
| 846 | memset(&iwe, 0, sizeof(iwe)); |
| 847 | iwe.cmd = SIOCGIWRATE; |
| 848 | /* Those two flags are ignored... */ |
| 849 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
| 850 | |
| 851 | for (i = 0; i < bss->supp_rates_len; i++) { |
| 852 | iwe.u.bitrate.value = ((bss->supp_rates[i] & |
| 853 | 0x7f) * 500000); |
| 854 | p = iwe_stream_add_value(info, current_ev, p, |
| 855 | end_buf, &iwe, IW_EV_PARAM_LEN); |
| 856 | } |
| 857 | current_ev = p; |
| 858 | } |
| 859 | |
| 860 | buf = kmalloc(30, GFP_ATOMIC); |
| 861 | if (buf) { |
| 862 | memset(&iwe, 0, sizeof(iwe)); |
| 863 | iwe.cmd = IWEVCUSTOM; |
| 864 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); |
| 865 | iwe.u.data.length = strlen(buf); |
| 866 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 867 | &iwe, buf); |
| 868 | memset(&iwe, 0, sizeof(iwe)); |
| 869 | iwe.cmd = IWEVCUSTOM; |
| 870 | sprintf(buf, " Last beacon: %dms ago", |
| 871 | jiffies_to_msecs(jiffies - bss->last_update)); |
| 872 | iwe.u.data.length = strlen(buf); |
| 873 | current_ev = iwe_stream_add_point(info, current_ev, |
| 874 | end_buf, &iwe, buf); |
| 875 | kfree(buf); |
| 876 | } |
| 877 | |
| 878 | if (bss_mesh_cfg(bss)) { |
| 879 | u8 *cfg = bss_mesh_cfg(bss); |
| 880 | buf = kmalloc(50, GFP_ATOMIC); |
| 881 | if (buf) { |
| 882 | memset(&iwe, 0, sizeof(iwe)); |
| 883 | iwe.cmd = IWEVCUSTOM; |
| 884 | sprintf(buf, "Mesh network (version %d)", cfg[0]); |
| 885 | iwe.u.data.length = strlen(buf); |
| 886 | current_ev = iwe_stream_add_point(info, current_ev, |
| 887 | end_buf, |
| 888 | &iwe, buf); |
| 889 | sprintf(buf, "Path Selection Protocol ID: " |
| 890 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], |
| 891 | cfg[4]); |
| 892 | iwe.u.data.length = strlen(buf); |
| 893 | current_ev = iwe_stream_add_point(info, current_ev, |
| 894 | end_buf, |
| 895 | &iwe, buf); |
| 896 | sprintf(buf, "Path Selection Metric ID: " |
| 897 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], |
| 898 | cfg[8]); |
| 899 | iwe.u.data.length = strlen(buf); |
| 900 | current_ev = iwe_stream_add_point(info, current_ev, |
| 901 | end_buf, |
| 902 | &iwe, buf); |
| 903 | sprintf(buf, "Congestion Control Mode ID: " |
| 904 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], |
| 905 | cfg[11], cfg[12]); |
| 906 | iwe.u.data.length = strlen(buf); |
| 907 | current_ev = iwe_stream_add_point(info, current_ev, |
| 908 | end_buf, |
| 909 | &iwe, buf); |
| 910 | sprintf(buf, "Channel Precedence: " |
| 911 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], |
| 912 | cfg[15], cfg[16]); |
| 913 | iwe.u.data.length = strlen(buf); |
| 914 | current_ev = iwe_stream_add_point(info, current_ev, |
| 915 | end_buf, |
| 916 | &iwe, buf); |
| 917 | kfree(buf); |
| 918 | } |
| 919 | } |
| 920 | |
| 921 | return current_ev; |
| 922 | } |
| 923 | |
| 924 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 925 | int ieee80211_scan_results(struct ieee80211_local *local, |
| 926 | struct iw_request_info *info, |
| 927 | char *buf, size_t len) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 928 | { |
| 929 | char *current_ev = buf; |
| 930 | char *end_buf = buf + len; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 931 | struct ieee80211_bss *bss; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 932 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 933 | spin_lock_bh(&local->bss_lock); |
| 934 | list_for_each_entry(bss, &local->bss_list, list) { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 935 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 936 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 937 | return -E2BIG; |
| 938 | } |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 939 | current_ev = ieee80211_scan_result(local, info, bss, |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 940 | current_ev, end_buf); |
| 941 | } |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 942 | spin_unlock_bh(&local->bss_lock); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 943 | return current_ev - buf; |
| 944 | } |