Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1 | /* |
| 2 | * IBSS mode implementation |
| 3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> |
| 4 | * Copyright 2004, Instant802 Networks, Inc. |
| 5 | * Copyright 2005, Devicescape Software, Inc. |
| 6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| 8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.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 | |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/if_ether.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/if_arp.h> |
| 19 | #include <linux/etherdevice.h> |
| 20 | #include <linux/rtnetlink.h> |
| 21 | #include <net/mac80211.h> |
| 22 | #include <asm/unaligned.h> |
| 23 | |
| 24 | #include "ieee80211_i.h" |
| 25 | #include "rate.h" |
| 26 | |
| 27 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) |
| 28 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) |
| 29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
| 30 | |
| 31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) |
Alina Friedrichsen | 4a332a3 | 2009-02-22 18:19:33 +0100 | [diff] [blame] | 32 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 33 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
| 34 | |
| 35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 |
| 36 | |
| 37 | |
| 38 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
| 39 | struct ieee80211_mgmt *mgmt, |
| 40 | size_t len) |
| 41 | { |
| 42 | u16 auth_alg, auth_transaction, status_code; |
| 43 | |
| 44 | if (len < 24 + 6) |
| 45 | return; |
| 46 | |
| 47 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); |
| 48 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); |
| 49 | status_code = le16_to_cpu(mgmt->u.auth.status_code); |
| 50 | |
| 51 | /* |
| 52 | * IEEE 802.11 standard does not require authentication in IBSS |
| 53 | * networks and most implementations do not seem to use it. |
| 54 | * However, try to reply to authentication attempts if someone |
| 55 | * has actually implemented this. |
| 56 | */ |
| 57 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) |
| 58 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, |
| 59 | sdata->u.ibss.bssid, 0); |
| 60 | } |
| 61 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 62 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
| 63 | const u8 *bssid, const int beacon_int, |
| 64 | struct ieee80211_channel *chan, |
| 65 | const size_t supp_rates_len, |
| 66 | const u8 *supp_rates, |
| 67 | const u16 capability, u64 tsf) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 68 | { |
| 69 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 70 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 71 | int rates, i, j; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 72 | struct sk_buff *skb; |
| 73 | struct ieee80211_mgmt *mgmt; |
| 74 | u8 *pos; |
| 75 | struct ieee80211_supported_band *sband; |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 76 | u32 bss_change; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 77 | |
| 78 | if (local->ops->reset_tsf) { |
| 79 | /* Reset own TSF to allow time synchronization work. */ |
| 80 | local->ops->reset_tsf(local_to_hw(local)); |
| 81 | } |
| 82 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 83 | skb = ifibss->skb; |
| 84 | rcu_assign_pointer(ifibss->presp, NULL); |
| 85 | synchronize_rcu(); |
| 86 | skb->data = skb->head; |
| 87 | skb->len = 0; |
| 88 | skb_reset_tail_pointer(skb); |
| 89 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 90 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 91 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
| 92 | sta_info_flush(sdata->local, sdata); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 93 | |
| 94 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 95 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 96 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 97 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 98 | ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 99 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 100 | local->oper_channel = chan; |
| 101 | local->oper_channel_type = NL80211_CHAN_NO_HT; |
| 102 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 103 | |
| 104 | sdata->vif.bss_conf.beacon_int = beacon_int; |
| 105 | bss_change = BSS_CHANGED_BEACON_INT; |
| 106 | bss_change |= ieee80211_reset_erp_info(sdata); |
| 107 | ieee80211_bss_info_change_notify(sdata, bss_change); |
| 108 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 109 | sband = local->hw.wiphy->bands[chan->band]; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 110 | |
| 111 | /* Build IBSS probe response */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 112 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 113 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
| 114 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 115 | IEEE80211_STYPE_PROBE_RESP); |
| 116 | memset(mgmt->da, 0xff, ETH_ALEN); |
| 117 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
| 118 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 119 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
Sujith | 707c1b4 | 2009-03-03 10:15:10 +0530 | [diff] [blame] | 120 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 121 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
| 122 | |
| 123 | pos = skb_put(skb, 2 + ifibss->ssid_len); |
| 124 | *pos++ = WLAN_EID_SSID; |
| 125 | *pos++ = ifibss->ssid_len; |
| 126 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
| 127 | |
| 128 | rates = supp_rates_len; |
| 129 | if (rates > 8) |
| 130 | rates = 8; |
| 131 | pos = skb_put(skb, 2 + rates); |
| 132 | *pos++ = WLAN_EID_SUPP_RATES; |
| 133 | *pos++ = rates; |
| 134 | memcpy(pos, supp_rates, rates); |
| 135 | |
| 136 | if (sband->band == IEEE80211_BAND_2GHZ) { |
| 137 | pos = skb_put(skb, 2 + 1); |
| 138 | *pos++ = WLAN_EID_DS_PARAMS; |
| 139 | *pos++ = 1; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 140 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | pos = skb_put(skb, 2 + 2); |
| 144 | *pos++ = WLAN_EID_IBSS_PARAMS; |
| 145 | *pos++ = 2; |
| 146 | /* FIX: set ATIM window based on scan results */ |
| 147 | *pos++ = 0; |
| 148 | *pos++ = 0; |
| 149 | |
| 150 | if (supp_rates_len > 8) { |
| 151 | rates = supp_rates_len - 8; |
| 152 | pos = skb_put(skb, 2 + rates); |
| 153 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
| 154 | *pos++ = rates; |
| 155 | memcpy(pos, &supp_rates[8], rates); |
| 156 | } |
| 157 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 158 | if (ifibss->ie_len) |
| 159 | memcpy(skb_put(skb, ifibss->ie_len), |
| 160 | ifibss->ie, ifibss->ie_len); |
| 161 | |
| 162 | rcu_assign_pointer(ifibss->presp, skb); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 163 | |
| 164 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON | |
| 165 | IEEE80211_IFCC_BEACON_ENABLED); |
| 166 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 167 | rates = 0; |
| 168 | for (i = 0; i < supp_rates_len; i++) { |
| 169 | int bitrate = (supp_rates[i] & 0x7f) * 5; |
| 170 | for (j = 0; j < sband->n_bitrates; j++) |
| 171 | if (sband->bitrates[j].bitrate == bitrate) |
| 172 | rates |= BIT(j); |
| 173 | } |
| 174 | |
| 175 | ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates); |
| 176 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 177 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 178 | mod_timer(&ifibss->timer, |
| 179 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 180 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 181 | cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
| 182 | mgmt, skb->len, 0, GFP_KERNEL); |
| 183 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 184 | } |
| 185 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 186 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
| 187 | struct ieee80211_bss *bss) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 188 | { |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 189 | u16 beacon_int = bss->cbss.beacon_interval; |
| 190 | |
| 191 | if (beacon_int < 10) |
| 192 | beacon_int = 10; |
| 193 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 194 | __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid, |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 195 | beacon_int, |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 196 | bss->cbss.channel, |
| 197 | bss->supp_rates_len, bss->supp_rates, |
| 198 | bss->cbss.capability, |
| 199 | bss->cbss.tsf); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
| 203 | struct ieee80211_mgmt *mgmt, |
| 204 | size_t len, |
| 205 | struct ieee80211_rx_status *rx_status, |
| 206 | struct ieee802_11_elems *elems, |
| 207 | bool beacon) |
| 208 | { |
| 209 | struct ieee80211_local *local = sdata->local; |
| 210 | int freq; |
| 211 | struct ieee80211_bss *bss; |
| 212 | struct sta_info *sta; |
| 213 | struct ieee80211_channel *channel; |
| 214 | u64 beacon_timestamp, rx_timestamp; |
| 215 | u32 supp_rates = 0; |
| 216 | enum ieee80211_band band = rx_status->band; |
| 217 | |
| 218 | if (elems->ds_params && elems->ds_params_len == 1) |
| 219 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); |
| 220 | else |
| 221 | freq = rx_status->freq; |
| 222 | |
| 223 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
| 224 | |
| 225 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| 226 | return; |
| 227 | |
| 228 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && |
| 229 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { |
| 230 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
| 231 | |
| 232 | rcu_read_lock(); |
| 233 | |
| 234 | sta = sta_info_get(local, mgmt->sa); |
| 235 | if (sta) { |
| 236 | u32 prev_rates; |
| 237 | |
| 238 | prev_rates = sta->sta.supp_rates[band]; |
| 239 | /* make sure mandatory rates are always added */ |
| 240 | sta->sta.supp_rates[band] = supp_rates | |
| 241 | ieee80211_mandatory_rates(local, band); |
| 242 | |
| 243 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 244 | if (sta->sta.supp_rates[band] != prev_rates) |
| 245 | printk(KERN_DEBUG "%s: updated supp_rates set " |
| 246 | "for %pM based on beacon info (0x%llx | " |
| 247 | "0x%llx -> 0x%llx)\n", |
| 248 | sdata->dev->name, |
| 249 | sta->sta.addr, |
| 250 | (unsigned long long) prev_rates, |
| 251 | (unsigned long long) supp_rates, |
| 252 | (unsigned long long) sta->sta.supp_rates[band]); |
| 253 | #endif |
| 254 | } else |
| 255 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); |
| 256 | |
| 257 | rcu_read_unlock(); |
| 258 | } |
| 259 | |
| 260 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
| 261 | channel, beacon); |
| 262 | if (!bss) |
| 263 | return; |
| 264 | |
| 265 | /* was just updated in ieee80211_bss_info_update */ |
| 266 | beacon_timestamp = bss->cbss.tsf; |
| 267 | |
| 268 | /* check if we need to merge IBSS */ |
| 269 | |
| 270 | /* merge only on beacons (???) */ |
| 271 | if (!beacon) |
| 272 | goto put_bss; |
| 273 | |
| 274 | /* we use a fixed BSSID */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 275 | if (sdata->u.ibss.bssid) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 276 | goto put_bss; |
| 277 | |
| 278 | /* not an IBSS */ |
| 279 | if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS)) |
| 280 | goto put_bss; |
| 281 | |
| 282 | /* different channel */ |
| 283 | if (bss->cbss.channel != local->oper_channel) |
| 284 | goto put_bss; |
| 285 | |
| 286 | /* different SSID */ |
| 287 | if (elems->ssid_len != sdata->u.ibss.ssid_len || |
| 288 | memcmp(elems->ssid, sdata->u.ibss.ssid, |
| 289 | sdata->u.ibss.ssid_len)) |
| 290 | goto put_bss; |
| 291 | |
Alina Friedrichsen | 34e8f08 | 2009-02-22 00:07:28 +0100 | [diff] [blame] | 292 | /* same BSSID */ |
| 293 | if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
| 294 | goto put_bss; |
| 295 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 296 | if (rx_status->flag & RX_FLAG_TSFT) { |
| 297 | /* |
| 298 | * For correct IBSS merging we need mactime; since mactime is |
| 299 | * defined as the time the first data symbol of the frame hits |
| 300 | * the PHY, and the timestamp of the beacon is defined as "the |
| 301 | * time that the data symbol containing the first bit of the |
| 302 | * timestamp is transmitted to the PHY plus the transmitting |
| 303 | * STA's delays through its local PHY from the MAC-PHY |
| 304 | * interface to its interface with the WM" (802.11 11.1.2) |
| 305 | * - equals the time this bit arrives at the receiver - we have |
| 306 | * to take into account the offset between the two. |
| 307 | * |
| 308 | * E.g. at 1 MBit that means mactime is 192 usec earlier |
| 309 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. |
| 310 | */ |
| 311 | int rate; |
| 312 | |
| 313 | if (rx_status->flag & RX_FLAG_HT) |
| 314 | rate = 65; /* TODO: HT rates */ |
| 315 | else |
| 316 | rate = local->hw.wiphy->bands[band]-> |
| 317 | bitrates[rx_status->rate_idx].bitrate; |
| 318 | |
| 319 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); |
| 320 | } else if (local && local->ops && local->ops->get_tsf) |
| 321 | /* second best option: get current TSF */ |
| 322 | rx_timestamp = local->ops->get_tsf(local_to_hw(local)); |
| 323 | else |
| 324 | /* can't merge without knowing the TSF */ |
| 325 | rx_timestamp = -1LLU; |
| 326 | |
| 327 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 328 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" |
| 329 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", |
| 330 | mgmt->sa, mgmt->bssid, |
| 331 | (unsigned long long)rx_timestamp, |
| 332 | (unsigned long long)beacon_timestamp, |
| 333 | (unsigned long long)(rx_timestamp - beacon_timestamp), |
| 334 | jiffies); |
| 335 | #endif |
| 336 | |
Alina Friedrichsen | 4a332a3 | 2009-02-22 18:19:33 +0100 | [diff] [blame] | 337 | /* give slow hardware some time to do the TSF sync */ |
| 338 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) |
| 339 | goto put_bss; |
| 340 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 341 | if (beacon_timestamp > rx_timestamp) { |
| 342 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 343 | printk(KERN_DEBUG "%s: beacon TSF higher than " |
| 344 | "local TSF - IBSS merge with BSSID %pM\n", |
| 345 | sdata->dev->name, mgmt->bssid); |
| 346 | #endif |
| 347 | ieee80211_sta_join_ibss(sdata, bss); |
| 348 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); |
| 349 | } |
| 350 | |
| 351 | put_bss: |
| 352 | ieee80211_rx_bss_put(local, bss); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Add a new IBSS station, will also be called by the RX code when, |
| 357 | * in IBSS mode, receiving a frame from a yet-unknown station, hence |
| 358 | * must be callable in atomic context. |
| 359 | */ |
| 360 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, |
| 361 | u8 *bssid,u8 *addr, u32 supp_rates) |
| 362 | { |
| 363 | struct ieee80211_local *local = sdata->local; |
| 364 | struct sta_info *sta; |
| 365 | int band = local->hw.conf.channel->band; |
| 366 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 367 | /* |
| 368 | * XXX: Consider removing the least recently used entry and |
| 369 | * allow new one to be added. |
| 370 | */ |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 371 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 372 | if (net_ratelimit()) |
| 373 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", |
| 374 | sdata->dev->name, addr); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
| 379 | return NULL; |
| 380 | |
| 381 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 382 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", |
| 383 | wiphy_name(local->hw.wiphy), addr, sdata->dev->name); |
| 384 | #endif |
| 385 | |
| 386 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
| 387 | if (!sta) |
| 388 | return NULL; |
| 389 | |
| 390 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); |
| 391 | |
| 392 | /* make sure mandatory rates are always added */ |
| 393 | sta->sta.supp_rates[band] = supp_rates | |
| 394 | ieee80211_mandatory_rates(local, band); |
| 395 | |
| 396 | rate_control_rate_init(sta); |
| 397 | |
| 398 | if (sta_info_insert(sta)) |
| 399 | return NULL; |
| 400 | |
| 401 | return sta; |
| 402 | } |
| 403 | |
| 404 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
| 405 | { |
| 406 | struct ieee80211_local *local = sdata->local; |
| 407 | int active = 0; |
| 408 | struct sta_info *sta; |
| 409 | |
| 410 | rcu_read_lock(); |
| 411 | |
| 412 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
| 413 | if (sta->sdata == sdata && |
| 414 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, |
| 415 | jiffies)) { |
| 416 | active++; |
| 417 | break; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | rcu_read_unlock(); |
| 422 | |
| 423 | return active; |
| 424 | } |
| 425 | |
| 426 | |
| 427 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
| 428 | { |
| 429 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 430 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 431 | mod_timer(&ifibss->timer, |
| 432 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 433 | |
| 434 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 435 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 436 | if (ieee80211_sta_active_ibss(sdata)) |
| 437 | return; |
| 438 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 439 | if (ifibss->fixed_channel) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 440 | return; |
| 441 | |
| 442 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " |
| 443 | "IBSS networks with same SSID (merge)\n", sdata->dev->name); |
| 444 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 445 | ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 446 | } |
| 447 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 448 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 449 | { |
| 450 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 451 | struct ieee80211_local *local = sdata->local; |
| 452 | struct ieee80211_supported_band *sband; |
| 453 | u8 *pos; |
| 454 | u8 bssid[ETH_ALEN]; |
| 455 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
| 456 | u16 capability; |
| 457 | int i; |
| 458 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 459 | if (ifibss->fixed_bssid) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 460 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
| 461 | } else { |
| 462 | /* Generate random, not broadcast, locally administered BSSID. Mix in |
| 463 | * own MAC address to make sure that devices that do not have proper |
| 464 | * random number generator get different BSSID. */ |
| 465 | get_random_bytes(bssid, ETH_ALEN); |
| 466 | for (i = 0; i < ETH_ALEN; i++) |
| 467 | bssid[i] ^= sdata->dev->dev_addr[i]; |
| 468 | bssid[0] &= ~0x01; |
| 469 | bssid[0] |= 0x02; |
| 470 | } |
| 471 | |
| 472 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", |
| 473 | sdata->dev->name, bssid); |
| 474 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 475 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 476 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 477 | capability = WLAN_CAPABILITY_IBSS; |
| 478 | |
| 479 | if (sdata->default_key) |
| 480 | capability |= WLAN_CAPABILITY_PRIVACY; |
| 481 | else |
| 482 | sdata->drop_unencrypted = 0; |
| 483 | |
| 484 | pos = supp_rates; |
| 485 | for (i = 0; i < sband->n_bitrates; i++) { |
| 486 | int rate = sband->bitrates[i].bitrate; |
| 487 | *pos++ = (u8) (rate / 5); |
| 488 | } |
| 489 | |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 490 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 491 | ifibss->channel, sband->n_bitrates, |
| 492 | supp_rates, capability, 0); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 493 | } |
| 494 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 495 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 496 | { |
| 497 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 498 | struct ieee80211_local *local = sdata->local; |
| 499 | struct ieee80211_bss *bss; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 500 | struct ieee80211_channel *chan = NULL; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 501 | const u8 *bssid = NULL; |
| 502 | int active_ibss; |
| 503 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 504 | active_ibss = ieee80211_sta_active_ibss(sdata); |
| 505 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 506 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", |
| 507 | sdata->dev->name, active_ibss); |
| 508 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 509 | |
| 510 | if (active_ibss) |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 511 | return; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 512 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 513 | if (ifibss->fixed_bssid) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 514 | bssid = ifibss->bssid; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 515 | if (ifibss->fixed_channel) |
| 516 | chan = ifibss->channel; |
| 517 | if (!is_zero_ether_addr(ifibss->bssid)) |
| 518 | bssid = ifibss->bssid; |
| 519 | bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 520 | ifibss->ssid, ifibss->ssid_len, |
| 521 | WLAN_CAPABILITY_IBSS, |
| 522 | WLAN_CAPABILITY_IBSS); |
| 523 | |
| 524 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 525 | if (bss) |
| 526 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
| 527 | "%pM\n", bss->cbss.bssid, ifibss->bssid); |
| 528 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 529 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 530 | if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 531 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
| 532 | " based on configured SSID\n", |
| 533 | sdata->dev->name, bss->cbss.bssid); |
| 534 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 535 | ieee80211_sta_join_ibss(sdata, bss); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 536 | ieee80211_rx_bss_put(local, bss); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 537 | return; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 538 | } else if (bss) |
| 539 | ieee80211_rx_bss_put(local, bss); |
| 540 | |
| 541 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 542 | printk(KERN_DEBUG " did not try to join ibss\n"); |
| 543 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 544 | |
| 545 | /* Selected IBSS not found in current scan results - try to scan */ |
| 546 | if (ifibss->state == IEEE80211_IBSS_MLME_JOINED && |
| 547 | !ieee80211_sta_active_ibss(sdata)) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 548 | mod_timer(&ifibss->timer, |
| 549 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
| 550 | } else if (time_after(jiffies, ifibss->last_scan_completed + |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 551 | IEEE80211_SCAN_INTERVAL)) { |
| 552 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " |
| 553 | "join\n", sdata->dev->name); |
| 554 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 555 | ieee80211_request_internal_scan(sdata, ifibss->ssid, |
| 556 | ifibss->ssid_len); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 557 | } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) { |
| 558 | int interval = IEEE80211_SCAN_INTERVAL; |
| 559 | |
| 560 | if (time_after(jiffies, ifibss->ibss_join_req + |
| 561 | IEEE80211_IBSS_JOIN_TIMEOUT)) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 562 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
| 563 | ieee80211_sta_create_ibss(sdata); |
| 564 | return; |
| 565 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 566 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
| 567 | " %d MHz\n", sdata->dev->name, |
| 568 | local->hw.conf.channel->center_freq); |
| 569 | |
| 570 | /* No IBSS found - decrease scan interval and continue |
| 571 | * scanning. */ |
| 572 | interval = IEEE80211_SCAN_INTERVAL_SLOW; |
| 573 | } |
| 574 | |
| 575 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 576 | mod_timer(&ifibss->timer, |
| 577 | round_jiffies(jiffies + interval)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 578 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
| 582 | struct ieee80211_mgmt *mgmt, |
| 583 | size_t len) |
| 584 | { |
| 585 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 586 | struct ieee80211_local *local = sdata->local; |
| 587 | int tx_last_beacon; |
| 588 | struct sk_buff *skb; |
| 589 | struct ieee80211_mgmt *resp; |
| 590 | u8 *pos, *end; |
| 591 | |
| 592 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 593 | len < 24 + 2 || !ifibss->presp) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 594 | return; |
| 595 | |
| 596 | if (local->ops->tx_last_beacon) |
| 597 | tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local)); |
| 598 | else |
| 599 | tx_last_beacon = 1; |
| 600 | |
| 601 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 602 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" |
| 603 | " (tx_last_beacon=%d)\n", |
| 604 | sdata->dev->name, mgmt->sa, mgmt->da, |
| 605 | mgmt->bssid, tx_last_beacon); |
| 606 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 607 | |
| 608 | if (!tx_last_beacon) |
| 609 | return; |
| 610 | |
| 611 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && |
| 612 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) |
| 613 | return; |
| 614 | |
| 615 | end = ((u8 *) mgmt) + len; |
| 616 | pos = mgmt->u.probe_req.variable; |
| 617 | if (pos[0] != WLAN_EID_SSID || |
| 618 | pos + 2 + pos[1] > end) { |
| 619 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 620 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " |
| 621 | "from %pM\n", |
| 622 | sdata->dev->name, mgmt->sa); |
| 623 | #endif |
| 624 | return; |
| 625 | } |
| 626 | if (pos[1] != 0 && |
| 627 | (pos[1] != ifibss->ssid_len || |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 628 | !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 629 | /* Ignore ProbeReq for foreign SSID */ |
| 630 | return; |
| 631 | } |
| 632 | |
| 633 | /* Reply with ProbeResp */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 634 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 635 | if (!skb) |
| 636 | return; |
| 637 | |
| 638 | resp = (struct ieee80211_mgmt *) skb->data; |
| 639 | memcpy(resp->da, mgmt->sa, ETH_ALEN); |
| 640 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 641 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", |
| 642 | sdata->dev->name, resp->da); |
| 643 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 644 | ieee80211_tx_skb(sdata, skb, 0); |
| 645 | } |
| 646 | |
| 647 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, |
| 648 | struct ieee80211_mgmt *mgmt, |
| 649 | size_t len, |
| 650 | struct ieee80211_rx_status *rx_status) |
| 651 | { |
| 652 | size_t baselen; |
| 653 | struct ieee802_11_elems elems; |
| 654 | |
| 655 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) |
| 656 | return; /* ignore ProbeResp to foreign address */ |
| 657 | |
| 658 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
| 659 | if (baselen > len) |
| 660 | return; |
| 661 | |
| 662 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
| 663 | &elems); |
| 664 | |
| 665 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); |
| 666 | } |
| 667 | |
| 668 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, |
| 669 | struct ieee80211_mgmt *mgmt, |
| 670 | size_t len, |
| 671 | struct ieee80211_rx_status *rx_status) |
| 672 | { |
| 673 | size_t baselen; |
| 674 | struct ieee802_11_elems elems; |
| 675 | |
| 676 | /* Process beacon from the current BSS */ |
| 677 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; |
| 678 | if (baselen > len) |
| 679 | return; |
| 680 | |
| 681 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); |
| 682 | |
| 683 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); |
| 684 | } |
| 685 | |
| 686 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
| 687 | struct sk_buff *skb) |
| 688 | { |
| 689 | struct ieee80211_rx_status *rx_status; |
| 690 | struct ieee80211_mgmt *mgmt; |
| 691 | u16 fc; |
| 692 | |
| 693 | rx_status = (struct ieee80211_rx_status *) skb->cb; |
| 694 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 695 | fc = le16_to_cpu(mgmt->frame_control); |
| 696 | |
| 697 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 698 | case IEEE80211_STYPE_PROBE_REQ: |
| 699 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); |
| 700 | break; |
| 701 | case IEEE80211_STYPE_PROBE_RESP: |
| 702 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, |
| 703 | rx_status); |
| 704 | break; |
| 705 | case IEEE80211_STYPE_BEACON: |
| 706 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, |
| 707 | rx_status); |
| 708 | break; |
| 709 | case IEEE80211_STYPE_AUTH: |
| 710 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); |
| 711 | break; |
| 712 | } |
| 713 | |
| 714 | kfree_skb(skb); |
| 715 | } |
| 716 | |
| 717 | static void ieee80211_ibss_work(struct work_struct *work) |
| 718 | { |
| 719 | struct ieee80211_sub_if_data *sdata = |
| 720 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); |
| 721 | struct ieee80211_local *local = sdata->local; |
| 722 | struct ieee80211_if_ibss *ifibss; |
| 723 | struct sk_buff *skb; |
| 724 | |
| 725 | if (!netif_running(sdata->dev)) |
| 726 | return; |
| 727 | |
| 728 | if (local->sw_scanning || local->hw_scanning) |
| 729 | return; |
| 730 | |
| 731 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) |
| 732 | return; |
| 733 | ifibss = &sdata->u.ibss; |
| 734 | |
| 735 | while ((skb = skb_dequeue(&ifibss->skb_queue))) |
| 736 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); |
| 737 | |
| 738 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) |
| 739 | return; |
| 740 | |
| 741 | switch (ifibss->state) { |
| 742 | case IEEE80211_IBSS_MLME_SEARCH: |
| 743 | ieee80211_sta_find_ibss(sdata); |
| 744 | break; |
| 745 | case IEEE80211_IBSS_MLME_JOINED: |
| 746 | ieee80211_sta_merge_ibss(sdata); |
| 747 | break; |
| 748 | default: |
| 749 | WARN_ON(1); |
| 750 | break; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | static void ieee80211_ibss_timer(unsigned long data) |
| 755 | { |
| 756 | struct ieee80211_sub_if_data *sdata = |
| 757 | (struct ieee80211_sub_if_data *) data; |
| 758 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 759 | struct ieee80211_local *local = sdata->local; |
| 760 | |
| 761 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
| 762 | queue_work(local->hw.workqueue, &ifibss->work); |
| 763 | } |
| 764 | |
| 765 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
| 766 | { |
| 767 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 768 | |
| 769 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); |
| 770 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
| 771 | (unsigned long) sdata); |
| 772 | skb_queue_head_init(&ifibss->skb_queue); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 773 | } |
| 774 | |
| 775 | /* scan finished notification */ |
| 776 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) |
| 777 | { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 778 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 779 | |
Johannes Berg | 29b4a4f | 2009-04-21 00:30:49 +0200 | [diff] [blame] | 780 | mutex_lock(&local->iflist_mtx); |
| 781 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 782 | if (!netif_running(sdata->dev)) |
| 783 | continue; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 784 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| 785 | continue; |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 786 | if (!sdata->u.ibss.ssid_len) |
| 787 | continue; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 788 | sdata->u.ibss.last_scan_completed = jiffies; |
| 789 | ieee80211_sta_find_ibss(sdata); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 790 | } |
Johannes Berg | 29b4a4f | 2009-04-21 00:30:49 +0200 | [diff] [blame] | 791 | mutex_unlock(&local->iflist_mtx); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | ieee80211_rx_result |
| 795 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
| 796 | struct ieee80211_rx_status *rx_status) |
| 797 | { |
| 798 | struct ieee80211_local *local = sdata->local; |
| 799 | struct ieee80211_mgmt *mgmt; |
| 800 | u16 fc; |
| 801 | |
| 802 | if (skb->len < 24) |
| 803 | return RX_DROP_MONITOR; |
| 804 | |
| 805 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 806 | fc = le16_to_cpu(mgmt->frame_control); |
| 807 | |
| 808 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 809 | case IEEE80211_STYPE_PROBE_RESP: |
| 810 | case IEEE80211_STYPE_BEACON: |
| 811 | memcpy(skb->cb, rx_status, sizeof(*rx_status)); |
| 812 | case IEEE80211_STYPE_PROBE_REQ: |
| 813 | case IEEE80211_STYPE_AUTH: |
| 814 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); |
| 815 | queue_work(local->hw.workqueue, &sdata->u.ibss.work); |
| 816 | return RX_QUEUED; |
| 817 | } |
| 818 | |
| 819 | return RX_DROP_MONITOR; |
| 820 | } |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 821 | |
| 822 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
| 823 | struct cfg80211_ibss_params *params) |
| 824 | { |
| 825 | struct sk_buff *skb; |
| 826 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 827 | if (params->bssid) { |
| 828 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); |
| 829 | sdata->u.ibss.fixed_bssid = true; |
| 830 | } else |
| 831 | sdata->u.ibss.fixed_bssid = false; |
| 832 | |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame^] | 833 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
| 834 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 835 | sdata->u.ibss.channel = params->channel; |
| 836 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
| 837 | |
| 838 | if (params->ie) { |
| 839 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, |
| 840 | GFP_KERNEL); |
| 841 | if (sdata->u.ibss.ie) |
| 842 | sdata->u.ibss.ie_len = params->ie_len; |
| 843 | } |
| 844 | |
| 845 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
| 846 | 36 /* bitrates */ + |
| 847 | 34 /* SSID */ + |
| 848 | 3 /* DS params */ + |
| 849 | 4 /* IBSS params */ + |
| 850 | params->ie_len); |
| 851 | if (!skb) |
| 852 | return -ENOMEM; |
| 853 | |
| 854 | sdata->u.ibss.skb = skb; |
| 855 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
| 856 | sdata->u.ibss.ibss_join_req = jiffies; |
| 857 | |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 858 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
| 859 | |
| 860 | /* |
| 861 | * The ssid_len setting below is used to see whether |
| 862 | * we are active, and we need all other settings |
| 863 | * before that may get visible. |
| 864 | */ |
| 865 | mb(); |
| 866 | |
| 867 | sdata->u.ibss.ssid_len = params->ssid_len; |
| 868 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 869 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
| 870 | queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work); |
| 871 | |
| 872 | return 0; |
| 873 | } |
| 874 | |
| 875 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
| 876 | { |
| 877 | struct sk_buff *skb; |
| 878 | |
| 879 | del_timer_sync(&sdata->u.ibss.timer); |
| 880 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
| 881 | cancel_work_sync(&sdata->u.ibss.work); |
| 882 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
| 883 | |
| 884 | sta_info_flush(sdata->local, sdata); |
| 885 | |
| 886 | /* remove beacon */ |
| 887 | kfree(sdata->u.ibss.ie); |
| 888 | skb = sdata->u.ibss.presp; |
| 889 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); |
| 890 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED); |
| 891 | synchronize_rcu(); |
| 892 | kfree_skb(skb); |
| 893 | |
| 894 | skb_queue_purge(&sdata->u.ibss.skb_queue); |
| 895 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); |
| 896 | |
| 897 | return 0; |
| 898 | } |