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" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 25 | #include "driver-ops.h" |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 26 | #include "rate.h" |
| 27 | |
| 28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) |
| 29 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) |
| 30 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
| 31 | |
| 32 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) |
Alina Friedrichsen | 4a332a3 | 2009-02-22 18:19:33 +0100 | [diff] [blame] | 33 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 34 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
| 35 | |
| 36 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 |
| 37 | |
| 38 | |
| 39 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
| 40 | struct ieee80211_mgmt *mgmt, |
| 41 | size_t len) |
| 42 | { |
| 43 | u16 auth_alg, auth_transaction, status_code; |
| 44 | |
| 45 | if (len < 24 + 6) |
| 46 | return; |
| 47 | |
| 48 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); |
| 49 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); |
| 50 | status_code = le16_to_cpu(mgmt->u.auth.status_code); |
| 51 | |
| 52 | /* |
| 53 | * IEEE 802.11 standard does not require authentication in IBSS |
| 54 | * networks and most implementations do not seem to use it. |
| 55 | * However, try to reply to authentication attempts if someone |
| 56 | * has actually implemented this. |
| 57 | */ |
| 58 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) |
| 59 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 60 | sdata->u.ibss.bssid, NULL, 0, 0); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 61 | } |
| 62 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 63 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
| 64 | const u8 *bssid, const int beacon_int, |
| 65 | struct ieee80211_channel *chan, |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 66 | const u32 basic_rates, |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 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 | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 71 | int rates, i; |
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 | f446d10 | 2009-10-28 15:12:32 +0100 | [diff] [blame] | 76 | struct cfg80211_bss *bss; |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 77 | u32 bss_change; |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 78 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 79 | |
| 80 | /* Reset own TSF to allow time synchronization work. */ |
| 81 | drv_reset_tsf(local); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 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 | local->oper_channel = chan; |
| 99 | local->oper_channel_type = NL80211_CHAN_NO_HT; |
| 100 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 101 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 102 | sband = local->hw.wiphy->bands[chan->band]; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 103 | |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 104 | /* build supported rates array */ |
| 105 | pos = supp_rates; |
| 106 | for (i = 0; i < sband->n_bitrates; i++) { |
| 107 | int rate = sband->bitrates[i].bitrate; |
| 108 | u8 basic = 0; |
| 109 | if (basic_rates & BIT(i)) |
| 110 | basic = 0x80; |
| 111 | *pos++ = basic | (u8) (rate / 5); |
| 112 | } |
| 113 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 114 | /* Build IBSS probe response */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 115 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 116 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
| 117 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 118 | IEEE80211_STYPE_PROBE_RESP); |
| 119 | memset(mgmt->da, 0xff, ETH_ALEN); |
| 120 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
| 121 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 122 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
Sujith | 707c1b4 | 2009-03-03 10:15:10 +0530 | [diff] [blame] | 123 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 124 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
| 125 | |
| 126 | pos = skb_put(skb, 2 + ifibss->ssid_len); |
| 127 | *pos++ = WLAN_EID_SSID; |
| 128 | *pos++ = ifibss->ssid_len; |
| 129 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
| 130 | |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 131 | rates = sband->n_bitrates; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 132 | if (rates > 8) |
| 133 | rates = 8; |
| 134 | pos = skb_put(skb, 2 + rates); |
| 135 | *pos++ = WLAN_EID_SUPP_RATES; |
| 136 | *pos++ = rates; |
| 137 | memcpy(pos, supp_rates, rates); |
| 138 | |
| 139 | if (sband->band == IEEE80211_BAND_2GHZ) { |
| 140 | pos = skb_put(skb, 2 + 1); |
| 141 | *pos++ = WLAN_EID_DS_PARAMS; |
| 142 | *pos++ = 1; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 143 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | pos = skb_put(skb, 2 + 2); |
| 147 | *pos++ = WLAN_EID_IBSS_PARAMS; |
| 148 | *pos++ = 2; |
| 149 | /* FIX: set ATIM window based on scan results */ |
| 150 | *pos++ = 0; |
| 151 | *pos++ = 0; |
| 152 | |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 153 | if (sband->n_bitrates > 8) { |
| 154 | rates = sband->n_bitrates - 8; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 155 | pos = skb_put(skb, 2 + rates); |
| 156 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
| 157 | *pos++ = rates; |
| 158 | memcpy(pos, &supp_rates[8], rates); |
| 159 | } |
| 160 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 161 | if (ifibss->ie_len) |
| 162 | memcpy(skb_put(skb, ifibss->ie_len), |
| 163 | ifibss->ie, ifibss->ie_len); |
| 164 | |
| 165 | rcu_assign_pointer(ifibss->presp, skb); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 166 | |
Johannes Berg | 2d0ddec | 2009-04-23 16:13:26 +0200 | [diff] [blame] | 167 | sdata->vif.bss_conf.beacon_int = beacon_int; |
| 168 | bss_change = BSS_CHANGED_BEACON_INT; |
| 169 | bss_change |= ieee80211_reset_erp_info(sdata); |
| 170 | bss_change |= BSS_CHANGED_BSSID; |
| 171 | bss_change |= BSS_CHANGED_BEACON; |
| 172 | bss_change |= BSS_CHANGED_BEACON_ENABLED; |
| 173 | ieee80211_bss_info_change_notify(sdata, bss_change); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 174 | |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 175 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 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 | f446d10 | 2009-10-28 15:12:32 +0100 | [diff] [blame] | 181 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
| 182 | mgmt, skb->len, 0, GFP_KERNEL); |
| 183 | cfg80211_put_bss(bss); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 184 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 185 | } |
| 186 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 187 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
| 188 | struct ieee80211_bss *bss) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 189 | { |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 190 | struct ieee80211_supported_band *sband; |
| 191 | u32 basic_rates; |
| 192 | int i, j; |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 193 | u16 beacon_int = bss->cbss.beacon_interval; |
| 194 | |
| 195 | if (beacon_int < 10) |
| 196 | beacon_int = 10; |
| 197 | |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 198 | sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band]; |
| 199 | |
| 200 | basic_rates = 0; |
| 201 | |
| 202 | for (i = 0; i < bss->supp_rates_len; i++) { |
| 203 | int rate = (bss->supp_rates[i] & 0x7f) * 5; |
| 204 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
| 205 | |
| 206 | for (j = 0; j < sband->n_bitrates; j++) { |
| 207 | if (sband->bitrates[j].bitrate == rate) { |
| 208 | if (is_basic) |
| 209 | basic_rates |= BIT(j); |
| 210 | break; |
| 211 | } |
| 212 | } |
| 213 | } |
| 214 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 215 | __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid, |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 216 | beacon_int, |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 217 | bss->cbss.channel, |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 218 | basic_rates, |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 219 | bss->cbss.capability, |
| 220 | bss->cbss.tsf); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
| 224 | struct ieee80211_mgmt *mgmt, |
| 225 | size_t len, |
| 226 | struct ieee80211_rx_status *rx_status, |
| 227 | struct ieee802_11_elems *elems, |
| 228 | bool beacon) |
| 229 | { |
| 230 | struct ieee80211_local *local = sdata->local; |
| 231 | int freq; |
| 232 | struct ieee80211_bss *bss; |
| 233 | struct sta_info *sta; |
| 234 | struct ieee80211_channel *channel; |
| 235 | u64 beacon_timestamp, rx_timestamp; |
| 236 | u32 supp_rates = 0; |
| 237 | enum ieee80211_band band = rx_status->band; |
| 238 | |
| 239 | if (elems->ds_params && elems->ds_params_len == 1) |
| 240 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); |
| 241 | else |
| 242 | freq = rx_status->freq; |
| 243 | |
| 244 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
| 245 | |
| 246 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| 247 | return; |
| 248 | |
| 249 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && |
| 250 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { |
| 251 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
| 252 | |
| 253 | rcu_read_lock(); |
| 254 | |
| 255 | sta = sta_info_get(local, mgmt->sa); |
| 256 | if (sta) { |
| 257 | u32 prev_rates; |
| 258 | |
| 259 | prev_rates = sta->sta.supp_rates[band]; |
| 260 | /* make sure mandatory rates are always added */ |
| 261 | sta->sta.supp_rates[band] = supp_rates | |
| 262 | ieee80211_mandatory_rates(local, band); |
| 263 | |
| 264 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 265 | if (sta->sta.supp_rates[band] != prev_rates) |
| 266 | printk(KERN_DEBUG "%s: updated supp_rates set " |
| 267 | "for %pM based on beacon info (0x%llx | " |
| 268 | "0x%llx -> 0x%llx)\n", |
| 269 | sdata->dev->name, |
| 270 | sta->sta.addr, |
| 271 | (unsigned long long) prev_rates, |
| 272 | (unsigned long long) supp_rates, |
| 273 | (unsigned long long) sta->sta.supp_rates[band]); |
| 274 | #endif |
| 275 | } else |
| 276 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); |
| 277 | |
| 278 | rcu_read_unlock(); |
| 279 | } |
| 280 | |
| 281 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
| 282 | channel, beacon); |
| 283 | if (!bss) |
| 284 | return; |
| 285 | |
| 286 | /* was just updated in ieee80211_bss_info_update */ |
| 287 | beacon_timestamp = bss->cbss.tsf; |
| 288 | |
| 289 | /* check if we need to merge IBSS */ |
| 290 | |
| 291 | /* merge only on beacons (???) */ |
| 292 | if (!beacon) |
| 293 | goto put_bss; |
| 294 | |
| 295 | /* we use a fixed BSSID */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 296 | if (sdata->u.ibss.bssid) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 297 | goto put_bss; |
| 298 | |
| 299 | /* not an IBSS */ |
| 300 | if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS)) |
| 301 | goto put_bss; |
| 302 | |
| 303 | /* different channel */ |
| 304 | if (bss->cbss.channel != local->oper_channel) |
| 305 | goto put_bss; |
| 306 | |
| 307 | /* different SSID */ |
| 308 | if (elems->ssid_len != sdata->u.ibss.ssid_len || |
| 309 | memcmp(elems->ssid, sdata->u.ibss.ssid, |
| 310 | sdata->u.ibss.ssid_len)) |
| 311 | goto put_bss; |
| 312 | |
Alina Friedrichsen | 34e8f08 | 2009-02-22 00:07:28 +0100 | [diff] [blame] | 313 | /* same BSSID */ |
| 314 | if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
| 315 | goto put_bss; |
| 316 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 317 | if (rx_status->flag & RX_FLAG_TSFT) { |
| 318 | /* |
| 319 | * For correct IBSS merging we need mactime; since mactime is |
| 320 | * defined as the time the first data symbol of the frame hits |
| 321 | * the PHY, and the timestamp of the beacon is defined as "the |
| 322 | * time that the data symbol containing the first bit of the |
| 323 | * timestamp is transmitted to the PHY plus the transmitting |
| 324 | * STA's delays through its local PHY from the MAC-PHY |
| 325 | * interface to its interface with the WM" (802.11 11.1.2) |
| 326 | * - equals the time this bit arrives at the receiver - we have |
| 327 | * to take into account the offset between the two. |
| 328 | * |
| 329 | * E.g. at 1 MBit that means mactime is 192 usec earlier |
| 330 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. |
| 331 | */ |
| 332 | int rate; |
| 333 | |
| 334 | if (rx_status->flag & RX_FLAG_HT) |
| 335 | rate = 65; /* TODO: HT rates */ |
| 336 | else |
| 337 | rate = local->hw.wiphy->bands[band]-> |
| 338 | bitrates[rx_status->rate_idx].bitrate; |
| 339 | |
| 340 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 341 | } else { |
| 342 | /* |
| 343 | * second best option: get current TSF |
| 344 | * (will return -1 if not supported) |
| 345 | */ |
| 346 | rx_timestamp = drv_get_tsf(local); |
| 347 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 348 | |
| 349 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 350 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" |
| 351 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", |
| 352 | mgmt->sa, mgmt->bssid, |
| 353 | (unsigned long long)rx_timestamp, |
| 354 | (unsigned long long)beacon_timestamp, |
| 355 | (unsigned long long)(rx_timestamp - beacon_timestamp), |
| 356 | jiffies); |
| 357 | #endif |
| 358 | |
Alina Friedrichsen | 4a332a3 | 2009-02-22 18:19:33 +0100 | [diff] [blame] | 359 | /* give slow hardware some time to do the TSF sync */ |
| 360 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) |
| 361 | goto put_bss; |
| 362 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 363 | if (beacon_timestamp > rx_timestamp) { |
| 364 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 365 | printk(KERN_DEBUG "%s: beacon TSF higher than " |
| 366 | "local TSF - IBSS merge with BSSID %pM\n", |
| 367 | sdata->dev->name, mgmt->bssid); |
| 368 | #endif |
| 369 | ieee80211_sta_join_ibss(sdata, bss); |
| 370 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); |
| 371 | } |
| 372 | |
| 373 | put_bss: |
| 374 | ieee80211_rx_bss_put(local, bss); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Add a new IBSS station, will also be called by the RX code when, |
| 379 | * in IBSS mode, receiving a frame from a yet-unknown station, hence |
| 380 | * must be callable in atomic context. |
| 381 | */ |
| 382 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, |
| 383 | u8 *bssid,u8 *addr, u32 supp_rates) |
| 384 | { |
| 385 | struct ieee80211_local *local = sdata->local; |
| 386 | struct sta_info *sta; |
| 387 | int band = local->hw.conf.channel->band; |
| 388 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 389 | /* |
| 390 | * XXX: Consider removing the least recently used entry and |
| 391 | * allow new one to be added. |
| 392 | */ |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 393 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 394 | if (net_ratelimit()) |
| 395 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", |
| 396 | sdata->dev->name, addr); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 397 | return NULL; |
| 398 | } |
| 399 | |
| 400 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
| 401 | return NULL; |
| 402 | |
| 403 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 404 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", |
| 405 | wiphy_name(local->hw.wiphy), addr, sdata->dev->name); |
| 406 | #endif |
| 407 | |
| 408 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
| 409 | if (!sta) |
| 410 | return NULL; |
| 411 | |
| 412 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); |
| 413 | |
| 414 | /* make sure mandatory rates are always added */ |
| 415 | sta->sta.supp_rates[band] = supp_rates | |
| 416 | ieee80211_mandatory_rates(local, band); |
| 417 | |
| 418 | rate_control_rate_init(sta); |
| 419 | |
| 420 | if (sta_info_insert(sta)) |
| 421 | return NULL; |
| 422 | |
| 423 | return sta; |
| 424 | } |
| 425 | |
| 426 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
| 427 | { |
| 428 | struct ieee80211_local *local = sdata->local; |
| 429 | int active = 0; |
| 430 | struct sta_info *sta; |
| 431 | |
| 432 | rcu_read_lock(); |
| 433 | |
| 434 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
| 435 | if (sta->sdata == sdata && |
| 436 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, |
| 437 | jiffies)) { |
| 438 | active++; |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | rcu_read_unlock(); |
| 444 | |
| 445 | return active; |
| 446 | } |
| 447 | |
| 448 | |
| 449 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
| 450 | { |
| 451 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 452 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 453 | mod_timer(&ifibss->timer, |
| 454 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 455 | |
| 456 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 457 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 458 | if (ieee80211_sta_active_ibss(sdata)) |
| 459 | return; |
| 460 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 461 | if (ifibss->fixed_channel) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 462 | return; |
| 463 | |
| 464 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " |
| 465 | "IBSS networks with same SSID (merge)\n", sdata->dev->name); |
| 466 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 467 | ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 468 | } |
| 469 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 470 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 471 | { |
| 472 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 473 | struct ieee80211_local *local = sdata->local; |
| 474 | struct ieee80211_supported_band *sband; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 475 | u8 bssid[ETH_ALEN]; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 476 | u16 capability; |
| 477 | int i; |
| 478 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 479 | if (ifibss->fixed_bssid) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 480 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
| 481 | } else { |
| 482 | /* Generate random, not broadcast, locally administered BSSID. Mix in |
| 483 | * own MAC address to make sure that devices that do not have proper |
| 484 | * random number generator get different BSSID. */ |
| 485 | get_random_bytes(bssid, ETH_ALEN); |
| 486 | for (i = 0; i < ETH_ALEN; i++) |
| 487 | bssid[i] ^= sdata->dev->dev_addr[i]; |
| 488 | bssid[0] &= ~0x01; |
| 489 | bssid[0] |= 0x02; |
| 490 | } |
| 491 | |
| 492 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", |
| 493 | sdata->dev->name, bssid); |
| 494 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 495 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 496 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 497 | capability = WLAN_CAPABILITY_IBSS; |
| 498 | |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 499 | if (ifibss->privacy) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 500 | capability |= WLAN_CAPABILITY_PRIVACY; |
| 501 | else |
| 502 | sdata->drop_unencrypted = 0; |
| 503 | |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 504 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
Johannes Berg | b59066a | 2009-05-12 21:18:38 +0200 | [diff] [blame] | 505 | ifibss->channel, 3, /* first two are basic */ |
| 506 | capability, 0); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 507 | } |
| 508 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 509 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 510 | { |
| 511 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 512 | struct ieee80211_local *local = sdata->local; |
| 513 | struct ieee80211_bss *bss; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 514 | struct ieee80211_channel *chan = NULL; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 515 | const u8 *bssid = NULL; |
| 516 | int active_ibss; |
Johannes Berg | e0d6188 | 2009-05-12 20:47:32 +0200 | [diff] [blame] | 517 | u16 capability; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 518 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 519 | active_ibss = ieee80211_sta_active_ibss(sdata); |
| 520 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 521 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", |
| 522 | sdata->dev->name, active_ibss); |
| 523 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 524 | |
| 525 | if (active_ibss) |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 526 | return; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 527 | |
Johannes Berg | e0d6188 | 2009-05-12 20:47:32 +0200 | [diff] [blame] | 528 | capability = WLAN_CAPABILITY_IBSS; |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 529 | if (ifibss->privacy) |
Johannes Berg | e0d6188 | 2009-05-12 20:47:32 +0200 | [diff] [blame] | 530 | capability |= WLAN_CAPABILITY_PRIVACY; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 531 | if (ifibss->fixed_bssid) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 532 | bssid = ifibss->bssid; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 533 | if (ifibss->fixed_channel) |
| 534 | chan = ifibss->channel; |
| 535 | if (!is_zero_ether_addr(ifibss->bssid)) |
| 536 | bssid = ifibss->bssid; |
| 537 | bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 538 | ifibss->ssid, ifibss->ssid_len, |
Johannes Berg | e0d6188 | 2009-05-12 20:47:32 +0200 | [diff] [blame] | 539 | WLAN_CAPABILITY_IBSS | |
Johannes Berg | db67645 | 2009-05-20 09:05:10 +0200 | [diff] [blame] | 540 | WLAN_CAPABILITY_PRIVACY, |
| 541 | capability); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 542 | |
Reinette Chatre | d419b9f | 2009-10-19 14:55:37 -0700 | [diff] [blame] | 543 | if (bss) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 544 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 545 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
| 546 | "%pM\n", bss->cbss.bssid, ifibss->bssid); |
| 547 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 548 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 549 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
| 550 | " based on configured SSID\n", |
| 551 | sdata->dev->name, bss->cbss.bssid); |
| 552 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 553 | ieee80211_sta_join_ibss(sdata, bss); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 554 | ieee80211_rx_bss_put(local, bss); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 555 | return; |
Reinette Chatre | d419b9f | 2009-10-19 14:55:37 -0700 | [diff] [blame] | 556 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 557 | |
| 558 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 559 | printk(KERN_DEBUG " did not try to join ibss\n"); |
| 560 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 561 | |
| 562 | /* Selected IBSS not found in current scan results - try to scan */ |
| 563 | if (ifibss->state == IEEE80211_IBSS_MLME_JOINED && |
| 564 | !ieee80211_sta_active_ibss(sdata)) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 565 | mod_timer(&ifibss->timer, |
| 566 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
| 567 | } else if (time_after(jiffies, ifibss->last_scan_completed + |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 568 | IEEE80211_SCAN_INTERVAL)) { |
| 569 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " |
| 570 | "join\n", sdata->dev->name); |
| 571 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 572 | ieee80211_request_internal_scan(sdata, ifibss->ssid, |
| 573 | ifibss->ssid_len); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 574 | } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) { |
| 575 | int interval = IEEE80211_SCAN_INTERVAL; |
| 576 | |
| 577 | if (time_after(jiffies, ifibss->ibss_join_req + |
| 578 | IEEE80211_IBSS_JOIN_TIMEOUT)) { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 579 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
| 580 | ieee80211_sta_create_ibss(sdata); |
| 581 | return; |
| 582 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 583 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
| 584 | " %d MHz\n", sdata->dev->name, |
| 585 | local->hw.conf.channel->center_freq); |
| 586 | |
| 587 | /* No IBSS found - decrease scan interval and continue |
| 588 | * scanning. */ |
| 589 | interval = IEEE80211_SCAN_INTERVAL_SLOW; |
| 590 | } |
| 591 | |
| 592 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 593 | mod_timer(&ifibss->timer, |
| 594 | round_jiffies(jiffies + interval)); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 595 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
| 599 | struct ieee80211_mgmt *mgmt, |
| 600 | size_t len) |
| 601 | { |
| 602 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 603 | struct ieee80211_local *local = sdata->local; |
| 604 | int tx_last_beacon; |
| 605 | struct sk_buff *skb; |
| 606 | struct ieee80211_mgmt *resp; |
| 607 | u8 *pos, *end; |
| 608 | |
| 609 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 610 | len < 24 + 2 || !ifibss->presp) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 611 | return; |
| 612 | |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 613 | tx_last_beacon = drv_tx_last_beacon(local); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 614 | |
| 615 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 616 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" |
| 617 | " (tx_last_beacon=%d)\n", |
| 618 | sdata->dev->name, mgmt->sa, mgmt->da, |
| 619 | mgmt->bssid, tx_last_beacon); |
| 620 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 621 | |
| 622 | if (!tx_last_beacon) |
| 623 | return; |
| 624 | |
| 625 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && |
| 626 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) |
| 627 | return; |
| 628 | |
| 629 | end = ((u8 *) mgmt) + len; |
| 630 | pos = mgmt->u.probe_req.variable; |
| 631 | if (pos[0] != WLAN_EID_SSID || |
| 632 | pos + 2 + pos[1] > end) { |
| 633 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 634 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " |
| 635 | "from %pM\n", |
| 636 | sdata->dev->name, mgmt->sa); |
| 637 | #endif |
| 638 | return; |
| 639 | } |
| 640 | if (pos[1] != 0 && |
| 641 | (pos[1] != ifibss->ssid_len || |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 642 | !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 643 | /* Ignore ProbeReq for foreign SSID */ |
| 644 | return; |
| 645 | } |
| 646 | |
| 647 | /* Reply with ProbeResp */ |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 648 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 649 | if (!skb) |
| 650 | return; |
| 651 | |
| 652 | resp = (struct ieee80211_mgmt *) skb->data; |
| 653 | memcpy(resp->da, mgmt->sa, ETH_ALEN); |
| 654 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
| 655 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", |
| 656 | sdata->dev->name, resp->da); |
| 657 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| 658 | ieee80211_tx_skb(sdata, skb, 0); |
| 659 | } |
| 660 | |
| 661 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, |
| 662 | struct ieee80211_mgmt *mgmt, |
| 663 | size_t len, |
| 664 | struct ieee80211_rx_status *rx_status) |
| 665 | { |
| 666 | size_t baselen; |
| 667 | struct ieee802_11_elems elems; |
| 668 | |
| 669 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) |
| 670 | return; /* ignore ProbeResp to foreign address */ |
| 671 | |
| 672 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
| 673 | if (baselen > len) |
| 674 | return; |
| 675 | |
| 676 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
| 677 | &elems); |
| 678 | |
| 679 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); |
| 680 | } |
| 681 | |
| 682 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, |
| 683 | struct ieee80211_mgmt *mgmt, |
| 684 | size_t len, |
| 685 | struct ieee80211_rx_status *rx_status) |
| 686 | { |
| 687 | size_t baselen; |
| 688 | struct ieee802_11_elems elems; |
| 689 | |
| 690 | /* Process beacon from the current BSS */ |
| 691 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; |
| 692 | if (baselen > len) |
| 693 | return; |
| 694 | |
| 695 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); |
| 696 | |
| 697 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); |
| 698 | } |
| 699 | |
| 700 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
| 701 | struct sk_buff *skb) |
| 702 | { |
| 703 | struct ieee80211_rx_status *rx_status; |
| 704 | struct ieee80211_mgmt *mgmt; |
| 705 | u16 fc; |
| 706 | |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 707 | rx_status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 708 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 709 | fc = le16_to_cpu(mgmt->frame_control); |
| 710 | |
| 711 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 712 | case IEEE80211_STYPE_PROBE_REQ: |
| 713 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); |
| 714 | break; |
| 715 | case IEEE80211_STYPE_PROBE_RESP: |
| 716 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, |
| 717 | rx_status); |
| 718 | break; |
| 719 | case IEEE80211_STYPE_BEACON: |
| 720 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, |
| 721 | rx_status); |
| 722 | break; |
| 723 | case IEEE80211_STYPE_AUTH: |
| 724 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); |
| 725 | break; |
| 726 | } |
| 727 | |
| 728 | kfree_skb(skb); |
| 729 | } |
| 730 | |
| 731 | static void ieee80211_ibss_work(struct work_struct *work) |
| 732 | { |
| 733 | struct ieee80211_sub_if_data *sdata = |
| 734 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); |
| 735 | struct ieee80211_local *local = sdata->local; |
| 736 | struct ieee80211_if_ibss *ifibss; |
| 737 | struct sk_buff *skb; |
| 738 | |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 739 | if (WARN_ON(local->suspended)) |
| 740 | return; |
| 741 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 742 | if (!netif_running(sdata->dev)) |
| 743 | return; |
| 744 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 745 | if (local->scanning) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 746 | return; |
| 747 | |
| 748 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) |
| 749 | return; |
| 750 | ifibss = &sdata->u.ibss; |
| 751 | |
| 752 | while ((skb = skb_dequeue(&ifibss->skb_queue))) |
| 753 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); |
| 754 | |
| 755 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) |
| 756 | return; |
| 757 | |
| 758 | switch (ifibss->state) { |
| 759 | case IEEE80211_IBSS_MLME_SEARCH: |
| 760 | ieee80211_sta_find_ibss(sdata); |
| 761 | break; |
| 762 | case IEEE80211_IBSS_MLME_JOINED: |
| 763 | ieee80211_sta_merge_ibss(sdata); |
| 764 | break; |
| 765 | default: |
| 766 | WARN_ON(1); |
| 767 | break; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | static void ieee80211_ibss_timer(unsigned long data) |
| 772 | { |
| 773 | struct ieee80211_sub_if_data *sdata = |
| 774 | (struct ieee80211_sub_if_data *) data; |
| 775 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 776 | struct ieee80211_local *local = sdata->local; |
| 777 | |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 778 | if (local->quiescing) { |
| 779 | ifibss->timer_running = true; |
| 780 | return; |
| 781 | } |
| 782 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 783 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 784 | ieee80211_queue_work(&local->hw, &ifibss->work); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 785 | } |
| 786 | |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 787 | #ifdef CONFIG_PM |
| 788 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) |
| 789 | { |
| 790 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 791 | |
| 792 | cancel_work_sync(&ifibss->work); |
| 793 | if (del_timer_sync(&ifibss->timer)) |
| 794 | ifibss->timer_running = true; |
| 795 | } |
| 796 | |
| 797 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) |
| 798 | { |
| 799 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 800 | |
| 801 | if (ifibss->timer_running) { |
| 802 | add_timer(&ifibss->timer); |
| 803 | ifibss->timer_running = false; |
| 804 | } |
| 805 | } |
| 806 | #endif |
| 807 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 808 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
| 809 | { |
| 810 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| 811 | |
| 812 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); |
| 813 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
| 814 | (unsigned long) sdata); |
| 815 | skb_queue_head_init(&ifibss->skb_queue); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | /* scan finished notification */ |
| 819 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) |
| 820 | { |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 821 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 822 | |
Johannes Berg | 29b4a4f | 2009-04-21 00:30:49 +0200 | [diff] [blame] | 823 | mutex_lock(&local->iflist_mtx); |
| 824 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 825 | if (!netif_running(sdata->dev)) |
| 826 | continue; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 827 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| 828 | continue; |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 829 | if (!sdata->u.ibss.ssid_len) |
| 830 | continue; |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 831 | sdata->u.ibss.last_scan_completed = jiffies; |
Johannes Berg | 51f98f1 | 2009-10-11 11:47:57 +0200 | [diff] [blame] | 832 | mod_timer(&sdata->u.ibss.timer, 0); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 833 | } |
Johannes Berg | 29b4a4f | 2009-04-21 00:30:49 +0200 | [diff] [blame] | 834 | mutex_unlock(&local->iflist_mtx); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 835 | } |
| 836 | |
| 837 | ieee80211_rx_result |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 838 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 839 | { |
| 840 | struct ieee80211_local *local = sdata->local; |
| 841 | struct ieee80211_mgmt *mgmt; |
| 842 | u16 fc; |
| 843 | |
| 844 | if (skb->len < 24) |
| 845 | return RX_DROP_MONITOR; |
| 846 | |
| 847 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 848 | fc = le16_to_cpu(mgmt->frame_control); |
| 849 | |
| 850 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 851 | case IEEE80211_STYPE_PROBE_RESP: |
| 852 | case IEEE80211_STYPE_BEACON: |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 853 | case IEEE80211_STYPE_PROBE_REQ: |
| 854 | case IEEE80211_STYPE_AUTH: |
| 855 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 856 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 857 | return RX_QUEUED; |
| 858 | } |
| 859 | |
| 860 | return RX_DROP_MONITOR; |
| 861 | } |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 862 | |
| 863 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
| 864 | struct cfg80211_ibss_params *params) |
| 865 | { |
| 866 | struct sk_buff *skb; |
| 867 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 868 | if (params->bssid) { |
| 869 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); |
| 870 | sdata->u.ibss.fixed_bssid = true; |
| 871 | } else |
| 872 | sdata->u.ibss.fixed_bssid = false; |
| 873 | |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 874 | sdata->u.ibss.privacy = params->privacy; |
| 875 | |
Johannes Berg | 57c4d7b | 2009-04-23 16:10:04 +0200 | [diff] [blame] | 876 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
| 877 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 878 | sdata->u.ibss.channel = params->channel; |
| 879 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
| 880 | |
| 881 | if (params->ie) { |
| 882 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, |
| 883 | GFP_KERNEL); |
| 884 | if (sdata->u.ibss.ie) |
| 885 | sdata->u.ibss.ie_len = params->ie_len; |
| 886 | } |
| 887 | |
| 888 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
| 889 | 36 /* bitrates */ + |
| 890 | 34 /* SSID */ + |
| 891 | 3 /* DS params */ + |
| 892 | 4 /* IBSS params */ + |
| 893 | params->ie_len); |
| 894 | if (!skb) |
| 895 | return -ENOMEM; |
| 896 | |
| 897 | sdata->u.ibss.skb = skb; |
| 898 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
| 899 | sdata->u.ibss.ibss_join_req = jiffies; |
| 900 | |
Johannes Berg | 0e41f71 | 2009-04-23 11:48:56 +0200 | [diff] [blame] | 901 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
| 902 | |
| 903 | /* |
| 904 | * The ssid_len setting below is used to see whether |
| 905 | * we are active, and we need all other settings |
| 906 | * before that may get visible. |
| 907 | */ |
| 908 | mb(); |
| 909 | |
| 910 | sdata->u.ibss.ssid_len = params->ssid_len; |
| 911 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 912 | ieee80211_recalc_idle(sdata->local); |
| 913 | |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 914 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 915 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 916 | |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
| 921 | { |
| 922 | struct sk_buff *skb; |
| 923 | |
| 924 | del_timer_sync(&sdata->u.ibss.timer); |
| 925 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
| 926 | cancel_work_sync(&sdata->u.ibss.work); |
| 927 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
| 928 | |
| 929 | sta_info_flush(sdata->local, sdata); |
| 930 | |
| 931 | /* remove beacon */ |
| 932 | kfree(sdata->u.ibss.ie); |
| 933 | skb = sdata->u.ibss.presp; |
| 934 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); |
Johannes Berg | 2d0ddec | 2009-04-23 16:13:26 +0200 | [diff] [blame] | 935 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 936 | synchronize_rcu(); |
| 937 | kfree_skb(skb); |
| 938 | |
| 939 | skb_queue_purge(&sdata->u.ibss.skb_queue); |
| 940 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 941 | sdata->u.ibss.ssid_len = 0; |
| 942 | |
| 943 | ieee80211_recalc_idle(sdata->local); |
Johannes Berg | af8cdcd | 2009-04-19 21:25:43 +0200 | [diff] [blame] | 944 | |
| 945 | return 0; |
| 946 | } |