Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * cfg80211 scan result handling |
| 3 | * |
| 4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> |
| 5 | */ |
| 6 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 7 | #include <linux/slab.h> |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 8 | #include <linux/module.h> |
| 9 | #include <linux/netdevice.h> |
| 10 | #include <linux/wireless.h> |
| 11 | #include <linux/nl80211.h> |
| 12 | #include <linux/etherdevice.h> |
| 13 | #include <net/arp.h> |
| 14 | #include <net/cfg80211.h> |
Johannes Berg | 262eb9b2 | 2011-07-13 10:39:09 +0200 | [diff] [blame] | 15 | #include <net/cfg80211-wext.h> |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 16 | #include <net/iw_handler.h> |
| 17 | #include "core.h" |
| 18 | #include "nl80211.h" |
Johannes Berg | a9a1162 | 2009-07-27 12:01:53 +0200 | [diff] [blame] | 19 | #include "wext-compat.h" |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 20 | #include "rdev-ops.h" |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 21 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 22 | /** |
| 23 | * DOC: BSS tree/list structure |
| 24 | * |
| 25 | * At the top level, the BSS list is kept in both a list in each |
| 26 | * registered device (@bss_list) as well as an RB-tree for faster |
| 27 | * lookup. In the RB-tree, entries can be looked up using their |
| 28 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID |
| 29 | * for other BSSes. |
| 30 | * |
| 31 | * Due to the possibility of hidden SSIDs, there's a second level |
| 32 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. |
| 33 | * The hidden_list connects all BSSes belonging to a single AP |
| 34 | * that has a hidden SSID, and connects beacon and probe response |
| 35 | * entries. For a probe response entry for a hidden SSID, the |
| 36 | * hidden_beacon_bss pointer points to the BSS struct holding the |
| 37 | * beacon's information. |
| 38 | * |
| 39 | * Reference counting is done for all these references except for |
| 40 | * the hidden_list, so that a beacon BSS struct that is otherwise |
| 41 | * not referenced has one reference for being on the bss_list and |
| 42 | * one for each probe response entry that points to it using the |
| 43 | * hidden_beacon_bss pointer. When a BSS struct that has such a |
| 44 | * pointer is get/put, the refcount update is also propagated to |
| 45 | * the referenced struct, this ensure that it cannot get removed |
| 46 | * while somebody is using the probe response version. |
| 47 | * |
| 48 | * Note that the hidden_beacon_bss pointer never changes, due to |
| 49 | * the reference counting. Therefore, no locking is needed for |
| 50 | * it. |
| 51 | * |
| 52 | * Also note that the hidden_beacon_bss pointer is only relevant |
| 53 | * if the driver uses something other than the IEs, e.g. private |
| 54 | * data stored stored in the BSS struct, since the beacon IEs are |
| 55 | * also linked into the probe response struct. |
| 56 | */ |
| 57 | |
Rajkumar Manoharan | f9616e0 | 2012-04-13 16:38:40 +0530 | [diff] [blame] | 58 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 59 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 60 | static void bss_free(struct cfg80211_internal_bss *bss) |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 61 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 62 | struct cfg80211_bss_ies *ies; |
Johannes Berg | b629ea3 | 2012-11-28 22:14:56 +0100 | [diff] [blame] | 63 | |
| 64 | if (WARN_ON(atomic_read(&bss->hold))) |
| 65 | return; |
| 66 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 67 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 68 | if (ies && !bss->pub.hidden_beacon_bss) |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 69 | kfree_rcu(ies, rcu_head); |
| 70 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); |
| 71 | if (ies) |
| 72 | kfree_rcu(ies, rcu_head); |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 73 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 74 | /* |
| 75 | * This happens when the module is removed, it doesn't |
| 76 | * really matter any more save for completeness |
| 77 | */ |
| 78 | if (!list_empty(&bss->hidden_list)) |
| 79 | list_del(&bss->hidden_list); |
| 80 | |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 81 | kfree(bss); |
| 82 | } |
| 83 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 84 | static inline void bss_ref_get(struct cfg80211_registered_device *dev, |
| 85 | struct cfg80211_internal_bss *bss) |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 86 | { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 87 | lockdep_assert_held(&dev->bss_lock); |
| 88 | |
| 89 | bss->refcount++; |
| 90 | if (bss->pub.hidden_beacon_bss) { |
| 91 | bss = container_of(bss->pub.hidden_beacon_bss, |
| 92 | struct cfg80211_internal_bss, |
| 93 | pub); |
| 94 | bss->refcount++; |
| 95 | } |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 96 | } |
| 97 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 98 | static inline void bss_ref_put(struct cfg80211_registered_device *dev, |
| 99 | struct cfg80211_internal_bss *bss) |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 100 | { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 101 | lockdep_assert_held(&dev->bss_lock); |
| 102 | |
| 103 | if (bss->pub.hidden_beacon_bss) { |
| 104 | struct cfg80211_internal_bss *hbss; |
| 105 | hbss = container_of(bss->pub.hidden_beacon_bss, |
| 106 | struct cfg80211_internal_bss, |
| 107 | pub); |
| 108 | hbss->refcount--; |
| 109 | if (hbss->refcount == 0) |
| 110 | bss_free(hbss); |
| 111 | } |
| 112 | bss->refcount--; |
| 113 | if (bss->refcount == 0) |
| 114 | bss_free(bss); |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 115 | } |
| 116 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 117 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 118 | struct cfg80211_internal_bss *bss) |
| 119 | { |
Johannes Berg | 4b1af47 | 2013-02-01 01:05:43 +0100 | [diff] [blame] | 120 | lockdep_assert_held(&dev->bss_lock); |
| 121 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 122 | if (!list_empty(&bss->hidden_list)) { |
| 123 | /* |
| 124 | * don't remove the beacon entry if it has |
| 125 | * probe responses associated with it |
| 126 | */ |
| 127 | if (!bss->pub.hidden_beacon_bss) |
| 128 | return false; |
| 129 | /* |
| 130 | * if it's a probe response entry break its |
| 131 | * link to the other entries in the group |
| 132 | */ |
| 133 | list_del_init(&bss->hidden_list); |
| 134 | } |
| 135 | |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 136 | list_del_init(&bss->list); |
| 137 | rb_erase(&bss->rbn, &dev->bss_tree); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 138 | bss_ref_put(dev, bss); |
| 139 | return true; |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 142 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, |
| 143 | unsigned long expire_time) |
| 144 | { |
| 145 | struct cfg80211_internal_bss *bss, *tmp; |
| 146 | bool expired = false; |
| 147 | |
Johannes Berg | 4b1af47 | 2013-02-01 01:05:43 +0100 | [diff] [blame] | 148 | lockdep_assert_held(&dev->bss_lock); |
| 149 | |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 150 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
| 151 | if (atomic_read(&bss->hold)) |
| 152 | continue; |
| 153 | if (!time_after(expire_time, bss->ts)) |
| 154 | continue; |
| 155 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 156 | if (__cfg80211_unlink_bss(dev, bss)) |
| 157 | expired = true; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | if (expired) |
| 161 | dev->bss_generation++; |
| 162 | } |
| 163 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 164 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
| 165 | bool send_message) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 166 | { |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 167 | struct cfg80211_scan_request *request; |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 168 | struct wireless_dev *wdev; |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 169 | struct sk_buff *msg; |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 170 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 171 | union iwreq_data wrqu; |
| 172 | #endif |
| 173 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 174 | ASSERT_RTNL(); |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 175 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 176 | if (rdev->scan_msg) { |
| 177 | nl80211_send_scan_result(rdev, rdev->scan_msg); |
| 178 | rdev->scan_msg = NULL; |
| 179 | return; |
| 180 | } |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 181 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 182 | request = rdev->scan_req; |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 183 | if (!request) |
| 184 | return; |
| 185 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 186 | wdev = request->wdev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 187 | |
Johannes Berg | 6829c87 | 2009-07-02 09:13:27 +0200 | [diff] [blame] | 188 | /* |
| 189 | * This must be before sending the other events! |
| 190 | * Otherwise, wpa_supplicant gets completely confused with |
| 191 | * wext events. |
| 192 | */ |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 193 | if (wdev->netdev) |
| 194 | cfg80211_sme_scan_done(wdev->netdev); |
Johannes Berg | 6829c87 | 2009-07-02 09:13:27 +0200 | [diff] [blame] | 195 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 196 | if (!request->aborted && |
| 197 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
| 198 | /* flush entries from previous scans */ |
| 199 | spin_lock_bh(&rdev->bss_lock); |
| 200 | __cfg80211_bss_expire(rdev, request->scan_start); |
| 201 | spin_unlock_bh(&rdev->bss_lock); |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 202 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 203 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 204 | msg = nl80211_build_scan_msg(rdev, wdev, request->aborted); |
| 205 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 206 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 207 | if (wdev->netdev && !request->aborted) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 208 | memset(&wrqu, 0, sizeof(wrqu)); |
| 209 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 210 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 211 | } |
| 212 | #endif |
| 213 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 214 | if (wdev->netdev) |
| 215 | dev_put(wdev->netdev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 216 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 217 | rdev->scan_req = NULL; |
Eliad Peller | 4a58e7c | 2013-12-05 18:30:17 +0200 | [diff] [blame] | 218 | kfree(request); |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 219 | |
| 220 | if (!send_message) |
| 221 | rdev->scan_msg = msg; |
| 222 | else |
| 223 | nl80211_send_scan_result(rdev, msg); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 224 | } |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 225 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 226 | void __cfg80211_scan_done(struct work_struct *wk) |
| 227 | { |
| 228 | struct cfg80211_registered_device *rdev; |
| 229 | |
| 230 | rdev = container_of(wk, struct cfg80211_registered_device, |
| 231 | scan_done_wk); |
| 232 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 233 | rtnl_lock(); |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 234 | ___cfg80211_scan_done(rdev, true); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 235 | rtnl_unlock(); |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 236 | } |
| 237 | |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 238 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
| 239 | { |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 240 | trace_cfg80211_scan_done(request, aborted); |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 241 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
| 242 | |
| 243 | request->aborted = aborted; |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 244 | request->notified = true; |
Alban Browaeys | e60d744 | 2009-11-25 15:13:00 +0100 | [diff] [blame] | 245 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 246 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 247 | EXPORT_SYMBOL(cfg80211_scan_done); |
| 248 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 249 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
| 250 | { |
| 251 | struct cfg80211_registered_device *rdev; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 252 | struct cfg80211_sched_scan_request *request; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 253 | |
| 254 | rdev = container_of(wk, struct cfg80211_registered_device, |
| 255 | sched_scan_results_wk); |
| 256 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 257 | rtnl_lock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 258 | |
Johannes Berg | 79845c6 | 2013-10-21 11:33:35 +0200 | [diff] [blame] | 259 | request = rdev->sched_scan_req; |
| 260 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 261 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 262 | if (request) { |
| 263 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { |
| 264 | /* flush entries from previous scans */ |
| 265 | spin_lock_bh(&rdev->bss_lock); |
| 266 | __cfg80211_bss_expire(rdev, request->scan_start); |
| 267 | spin_unlock_bh(&rdev->bss_lock); |
| 268 | request->scan_start = |
| 269 | jiffies + msecs_to_jiffies(request->interval); |
| 270 | } |
| 271 | nl80211_send_sched_scan_results(rdev, request->dev); |
| 272 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 273 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 274 | rtnl_unlock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | void cfg80211_sched_scan_results(struct wiphy *wiphy) |
| 278 | { |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 279 | trace_cfg80211_sched_scan_results(wiphy); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 280 | /* ignore if we're not scanning */ |
| 281 | if (wiphy_to_dev(wiphy)->sched_scan_req) |
| 282 | queue_work(cfg80211_wq, |
| 283 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); |
| 284 | } |
| 285 | EXPORT_SYMBOL(cfg80211_sched_scan_results); |
| 286 | |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 287 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 288 | { |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 289 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 290 | |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 291 | ASSERT_RTNL(); |
| 292 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 293 | trace_cfg80211_sched_scan_stopped(wiphy); |
| 294 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 295 | __cfg80211_stop_sched_scan(rdev, true); |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 296 | } |
| 297 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); |
| 298 | |
| 299 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
| 300 | { |
| 301 | rtnl_lock(); |
| 302 | cfg80211_sched_scan_stopped_rtnl(wiphy); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 303 | rtnl_unlock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 304 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 305 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
| 306 | |
| 307 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
| 308 | bool driver_initiated) |
| 309 | { |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 310 | struct net_device *dev; |
| 311 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 312 | ASSERT_RTNL(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 313 | |
| 314 | if (!rdev->sched_scan_req) |
Luciano Coelho | 1a84ff7 | 2011-07-08 11:16:16 +0300 | [diff] [blame] | 315 | return -ENOENT; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 316 | |
| 317 | dev = rdev->sched_scan_req->dev; |
| 318 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 319 | if (!driver_initiated) { |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 320 | int err = rdev_sched_scan_stop(rdev, dev); |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 321 | if (err) |
| 322 | return err; |
| 323 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 324 | |
| 325 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); |
| 326 | |
| 327 | kfree(rdev->sched_scan_req); |
| 328 | rdev->sched_scan_req = NULL; |
| 329 | |
Jesper Juhl | 3b4670f | 2011-06-29 22:49:33 +0200 | [diff] [blame] | 330 | return 0; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 331 | } |
| 332 | |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 333 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
| 334 | unsigned long age_secs) |
| 335 | { |
| 336 | struct cfg80211_internal_bss *bss; |
| 337 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); |
| 338 | |
Johannes Berg | 2ca813a | 2013-02-01 01:04:14 +0100 | [diff] [blame] | 339 | spin_lock_bh(&dev->bss_lock); |
Johannes Berg | 915de2f | 2012-11-28 22:39:37 +0100 | [diff] [blame] | 340 | list_for_each_entry(bss, &dev->bss_list, list) |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 341 | bss->ts -= age_jiffies; |
Johannes Berg | 2ca813a | 2013-02-01 01:04:14 +0100 | [diff] [blame] | 342 | spin_unlock_bh(&dev->bss_lock); |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 343 | } |
| 344 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 345 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
| 346 | { |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 347 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 348 | } |
| 349 | |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 350 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 351 | { |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 352 | while (len > 2 && ies[0] != eid) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 353 | len -= ies[1] + 2; |
| 354 | ies += ies[1] + 2; |
| 355 | } |
| 356 | if (len < 2) |
| 357 | return NULL; |
| 358 | if (len < 2 + ies[1]) |
| 359 | return NULL; |
| 360 | return ies; |
| 361 | } |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 362 | EXPORT_SYMBOL(cfg80211_find_ie); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 363 | |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 364 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
| 365 | const u8 *ies, int len) |
| 366 | { |
| 367 | struct ieee80211_vendor_ie *ie; |
| 368 | const u8 *pos = ies, *end = ies + len; |
| 369 | int ie_oui; |
| 370 | |
| 371 | while (pos < end) { |
| 372 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, |
| 373 | end - pos); |
| 374 | if (!pos) |
| 375 | return NULL; |
| 376 | |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 377 | ie = (struct ieee80211_vendor_ie *)pos; |
Luciano Coelho | 6719429 | 2013-02-12 20:11:38 +0200 | [diff] [blame] | 378 | |
| 379 | /* make sure we can access ie->len */ |
| 380 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); |
| 381 | |
| 382 | if (ie->len < sizeof(*ie)) |
| 383 | goto cont; |
| 384 | |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 385 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
| 386 | if (ie_oui == oui && ie->oui_type == oui_type) |
| 387 | return pos; |
Luciano Coelho | 6719429 | 2013-02-12 20:11:38 +0200 | [diff] [blame] | 388 | cont: |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 389 | pos += 2 + ie->len; |
| 390 | } |
| 391 | return NULL; |
| 392 | } |
| 393 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); |
| 394 | |
Johannes Berg | 915de2f | 2012-11-28 22:39:37 +0100 | [diff] [blame] | 395 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 396 | const u8 *ssid, size_t ssid_len) |
| 397 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 398 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 399 | const u8 *ssidie; |
| 400 | |
Joe Perches | ac422d3 | 2012-05-08 18:56:55 +0000 | [diff] [blame] | 401 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 402 | return false; |
| 403 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 404 | if (!ssid) |
| 405 | return true; |
| 406 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 407 | ies = rcu_access_pointer(a->ies); |
| 408 | if (!ies) |
| 409 | return false; |
| 410 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 411 | if (!ssidie) |
| 412 | return false; |
| 413 | if (ssidie[1] != ssid_len) |
| 414 | return false; |
| 415 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; |
| 416 | } |
| 417 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 418 | /** |
| 419 | * enum bss_compare_mode - BSS compare mode |
| 420 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) |
| 421 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode |
| 422 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode |
| 423 | */ |
| 424 | enum bss_compare_mode { |
| 425 | BSS_CMP_REGULAR, |
| 426 | BSS_CMP_HIDE_ZLEN, |
| 427 | BSS_CMP_HIDE_NUL, |
| 428 | }; |
| 429 | |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 430 | static int cmp_bss(struct cfg80211_bss *a, |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 431 | struct cfg80211_bss *b, |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 432 | enum bss_compare_mode mode) |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 433 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 434 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 435 | const u8 *ie1 = NULL; |
| 436 | const u8 *ie2 = NULL; |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 437 | int i, r; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 438 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 439 | if (a->channel != b->channel) |
| 440 | return b->channel->center_freq - a->channel->center_freq; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 441 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 442 | a_ies = rcu_access_pointer(a->ies); |
| 443 | if (!a_ies) |
| 444 | return -1; |
| 445 | b_ies = rcu_access_pointer(b->ies); |
| 446 | if (!b_ies) |
| 447 | return 1; |
| 448 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 449 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
| 450 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 451 | a_ies->data, a_ies->len); |
| 452 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) |
| 453 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 454 | b_ies->data, b_ies->len); |
| 455 | if (ie1 && ie2) { |
| 456 | int mesh_id_cmp; |
| 457 | |
| 458 | if (ie1[1] == ie2[1]) |
| 459 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
| 460 | else |
| 461 | mesh_id_cmp = ie2[1] - ie1[1]; |
| 462 | |
| 463 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 464 | a_ies->data, a_ies->len); |
| 465 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 466 | b_ies->data, b_ies->len); |
| 467 | if (ie1 && ie2) { |
| 468 | if (mesh_id_cmp) |
| 469 | return mesh_id_cmp; |
| 470 | if (ie1[1] != ie2[1]) |
| 471 | return ie2[1] - ie1[1]; |
| 472 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
| 473 | } |
| 474 | } |
| 475 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 476 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
| 477 | if (r) |
| 478 | return r; |
| 479 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 480 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
| 481 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 482 | |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 483 | if (!ie1 && !ie2) |
| 484 | return 0; |
| 485 | |
Johannes Berg | f94f8b1 | 2012-11-28 22:42:34 +0100 | [diff] [blame] | 486 | /* |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 487 | * Note that with "hide_ssid", the function returns a match if |
| 488 | * the already-present BSS ("b") is a hidden SSID beacon for |
| 489 | * the new BSS ("a"). |
Johannes Berg | f94f8b1 | 2012-11-28 22:42:34 +0100 | [diff] [blame] | 490 | */ |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 491 | |
| 492 | /* sort missing IE before (left of) present IE */ |
| 493 | if (!ie1) |
| 494 | return -1; |
| 495 | if (!ie2) |
| 496 | return 1; |
| 497 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 498 | switch (mode) { |
| 499 | case BSS_CMP_HIDE_ZLEN: |
| 500 | /* |
| 501 | * In ZLEN mode we assume the BSS entry we're |
| 502 | * looking for has a zero-length SSID. So if |
| 503 | * the one we're looking at right now has that, |
| 504 | * return 0. Otherwise, return the difference |
| 505 | * in length, but since we're looking for the |
| 506 | * 0-length it's really equivalent to returning |
| 507 | * the length of the one we're looking at. |
| 508 | * |
| 509 | * No content comparison is needed as we assume |
| 510 | * the content length is zero. |
| 511 | */ |
| 512 | return ie2[1]; |
| 513 | case BSS_CMP_REGULAR: |
| 514 | default: |
| 515 | /* sort by length first, then by contents */ |
| 516 | if (ie1[1] != ie2[1]) |
| 517 | return ie2[1] - ie1[1]; |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 518 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 519 | case BSS_CMP_HIDE_NUL: |
| 520 | if (ie1[1] != ie2[1]) |
| 521 | return ie2[1] - ie1[1]; |
| 522 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ |
| 523 | for (i = 0; i < ie2[1]; i++) |
| 524 | if (ie2[i + 2]) |
| 525 | return -1; |
| 526 | return 0; |
| 527 | } |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 528 | } |
| 529 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 530 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 531 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
| 532 | struct ieee80211_channel *channel, |
| 533 | const u8 *bssid, |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 534 | const u8 *ssid, size_t ssid_len, |
| 535 | u16 capa_mask, u16 capa_val) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 536 | { |
| 537 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 538 | struct cfg80211_internal_bss *bss, *res = NULL; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 539 | unsigned long now = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 540 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 541 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
| 542 | capa_val); |
| 543 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 544 | spin_lock_bh(&dev->bss_lock); |
| 545 | |
| 546 | list_for_each_entry(bss, &dev->bss_list, list) { |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 547 | if ((bss->pub.capability & capa_mask) != capa_val) |
| 548 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 549 | if (channel && bss->pub.channel != channel) |
| 550 | continue; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 551 | /* Don't get expired BSS structs */ |
| 552 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && |
| 553 | !atomic_read(&bss->hold)) |
| 554 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 555 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
| 556 | res = bss; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 557 | bss_ref_get(dev, res); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 558 | break; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | spin_unlock_bh(&dev->bss_lock); |
| 563 | if (!res) |
| 564 | return NULL; |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 565 | trace_cfg80211_return_bss(&res->pub); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 566 | return &res->pub; |
| 567 | } |
| 568 | EXPORT_SYMBOL(cfg80211_get_bss); |
| 569 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 570 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
| 571 | struct cfg80211_internal_bss *bss) |
| 572 | { |
| 573 | struct rb_node **p = &dev->bss_tree.rb_node; |
| 574 | struct rb_node *parent = NULL; |
| 575 | struct cfg80211_internal_bss *tbss; |
| 576 | int cmp; |
| 577 | |
| 578 | while (*p) { |
| 579 | parent = *p; |
| 580 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); |
| 581 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 582 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 583 | |
| 584 | if (WARN_ON(!cmp)) { |
| 585 | /* will sort of leak this BSS */ |
| 586 | return; |
| 587 | } |
| 588 | |
| 589 | if (cmp < 0) |
| 590 | p = &(*p)->rb_left; |
| 591 | else |
| 592 | p = &(*p)->rb_right; |
| 593 | } |
| 594 | |
| 595 | rb_link_node(&bss->rbn, parent, p); |
| 596 | rb_insert_color(&bss->rbn, &dev->bss_tree); |
| 597 | } |
| 598 | |
| 599 | static struct cfg80211_internal_bss * |
| 600 | rb_find_bss(struct cfg80211_registered_device *dev, |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 601 | struct cfg80211_internal_bss *res, |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 602 | enum bss_compare_mode mode) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 603 | { |
| 604 | struct rb_node *n = dev->bss_tree.rb_node; |
| 605 | struct cfg80211_internal_bss *bss; |
| 606 | int r; |
| 607 | |
| 608 | while (n) { |
| 609 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 610 | r = cmp_bss(&res->pub, &bss->pub, mode); |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 611 | |
| 612 | if (r == 0) |
| 613 | return bss; |
| 614 | else if (r < 0) |
| 615 | n = n->rb_left; |
| 616 | else |
| 617 | n = n->rb_right; |
| 618 | } |
| 619 | |
| 620 | return NULL; |
| 621 | } |
| 622 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 623 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev, |
| 624 | struct cfg80211_internal_bss *new) |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 625 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 626 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 627 | struct cfg80211_internal_bss *bss; |
| 628 | const u8 *ie; |
| 629 | int i, ssidlen; |
| 630 | u8 fold = 0; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 631 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 632 | ies = rcu_access_pointer(new->pub.beacon_ies); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 633 | if (WARN_ON(!ies)) |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 634 | return false; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 635 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 636 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
| 637 | if (!ie) { |
| 638 | /* nothing to do */ |
| 639 | return true; |
| 640 | } |
| 641 | |
| 642 | ssidlen = ie[1]; |
| 643 | for (i = 0; i < ssidlen; i++) |
| 644 | fold |= ie[2 + i]; |
| 645 | |
| 646 | if (fold) { |
| 647 | /* not a hidden SSID */ |
| 648 | return true; |
| 649 | } |
| 650 | |
| 651 | /* This is the bad part ... */ |
| 652 | |
| 653 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 654 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
| 655 | continue; |
| 656 | if (bss->pub.channel != new->pub.channel) |
| 657 | continue; |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 658 | if (bss->pub.scan_width != new->pub.scan_width) |
| 659 | continue; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 660 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
| 661 | continue; |
| 662 | ies = rcu_access_pointer(bss->pub.ies); |
| 663 | if (!ies) |
| 664 | continue; |
| 665 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
| 666 | if (!ie) |
| 667 | continue; |
| 668 | if (ssidlen && ie[1] != ssidlen) |
| 669 | continue; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 670 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
| 671 | continue; |
| 672 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) |
| 673 | list_del(&bss->hidden_list); |
| 674 | /* combine them */ |
| 675 | list_add(&bss->hidden_list, &new->hidden_list); |
| 676 | bss->pub.hidden_beacon_bss = &new->pub; |
| 677 | new->refcount += bss->refcount; |
| 678 | rcu_assign_pointer(bss->pub.beacon_ies, |
| 679 | new->pub.beacon_ies); |
| 680 | } |
| 681 | |
| 682 | return true; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 683 | } |
| 684 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 685 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 686 | static struct cfg80211_internal_bss * |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 687 | cfg80211_bss_update(struct cfg80211_registered_device *dev, |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 688 | struct cfg80211_internal_bss *tmp, |
| 689 | bool signal_valid) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 690 | { |
| 691 | struct cfg80211_internal_bss *found = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 692 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 693 | if (WARN_ON(!tmp->pub.channel)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 694 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 695 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 696 | tmp->ts = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 697 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 698 | spin_lock_bh(&dev->bss_lock); |
| 699 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 700 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
| 701 | spin_unlock_bh(&dev->bss_lock); |
| 702 | return NULL; |
| 703 | } |
| 704 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 705 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 706 | |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 707 | if (found) { |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 708 | /* Update IEs */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 709 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
| 710 | const struct cfg80211_bss_ies *old; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 711 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 712 | old = rcu_access_pointer(found->pub.proberesp_ies); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 713 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 714 | rcu_assign_pointer(found->pub.proberesp_ies, |
| 715 | tmp->pub.proberesp_ies); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 716 | /* Override possible earlier Beacon frame IEs */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 717 | rcu_assign_pointer(found->pub.ies, |
| 718 | tmp->pub.proberesp_ies); |
| 719 | if (old) |
| 720 | kfree_rcu((struct cfg80211_bss_ies *)old, |
| 721 | rcu_head); |
| 722 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { |
Johannes Berg | 9537f22 | 2013-02-01 01:19:48 +0100 | [diff] [blame] | 723 | const struct cfg80211_bss_ies *old; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 724 | struct cfg80211_internal_bss *bss; |
| 725 | |
| 726 | if (found->pub.hidden_beacon_bss && |
| 727 | !list_empty(&found->hidden_list)) { |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 728 | const struct cfg80211_bss_ies *f; |
| 729 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 730 | /* |
| 731 | * The found BSS struct is one of the probe |
| 732 | * response members of a group, but we're |
| 733 | * receiving a beacon (beacon_ies in the tmp |
| 734 | * bss is used). This can only mean that the |
| 735 | * AP changed its beacon from not having an |
| 736 | * SSID to showing it, which is confusing so |
| 737 | * drop this information. |
| 738 | */ |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 739 | |
| 740 | f = rcu_access_pointer(tmp->pub.beacon_ies); |
| 741 | kfree_rcu((struct cfg80211_bss_ies *)f, |
| 742 | rcu_head); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 743 | goto drop; |
| 744 | } |
Johannes Berg | 915de2f | 2012-11-28 22:39:37 +0100 | [diff] [blame] | 745 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 746 | old = rcu_access_pointer(found->pub.beacon_ies); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 747 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 748 | rcu_assign_pointer(found->pub.beacon_ies, |
| 749 | tmp->pub.beacon_ies); |
Sven Neumann | 01123e2 | 2010-12-09 15:05:24 +0100 | [diff] [blame] | 750 | |
| 751 | /* Override IEs if they were from a beacon before */ |
Johannes Berg | 9537f22 | 2013-02-01 01:19:48 +0100 | [diff] [blame] | 752 | if (old == rcu_access_pointer(found->pub.ies)) |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 753 | rcu_assign_pointer(found->pub.ies, |
| 754 | tmp->pub.beacon_ies); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 755 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 756 | /* Assign beacon IEs to all sub entries */ |
| 757 | list_for_each_entry(bss, &found->hidden_list, |
| 758 | hidden_list) { |
| 759 | const struct cfg80211_bss_ies *ies; |
| 760 | |
| 761 | ies = rcu_access_pointer(bss->pub.beacon_ies); |
| 762 | WARN_ON(ies != old); |
| 763 | |
| 764 | rcu_assign_pointer(bss->pub.beacon_ies, |
| 765 | tmp->pub.beacon_ies); |
| 766 | } |
| 767 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 768 | if (old) |
| 769 | kfree_rcu((struct cfg80211_bss_ies *)old, |
| 770 | rcu_head); |
| 771 | } |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 772 | |
| 773 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 774 | /* |
| 775 | * don't update the signal if beacon was heard on |
| 776 | * adjacent channel. |
| 777 | */ |
| 778 | if (signal_valid) |
| 779 | found->pub.signal = tmp->pub.signal; |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 780 | found->pub.capability = tmp->pub.capability; |
| 781 | found->ts = tmp->ts; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 782 | } else { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 783 | struct cfg80211_internal_bss *new; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 784 | struct cfg80211_internal_bss *hidden; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 785 | struct cfg80211_bss_ies *ies; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 786 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 787 | /* |
| 788 | * create a copy -- the "res" variable that is passed in |
| 789 | * is allocated on the stack since it's not needed in the |
| 790 | * more common case of an update |
| 791 | */ |
| 792 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, |
| 793 | GFP_ATOMIC); |
| 794 | if (!new) { |
| 795 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); |
| 796 | if (ies) |
| 797 | kfree_rcu(ies, rcu_head); |
| 798 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); |
| 799 | if (ies) |
| 800 | kfree_rcu(ies, rcu_head); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 801 | goto drop; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 802 | } |
| 803 | memcpy(new, tmp, sizeof(*new)); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 804 | new->refcount = 1; |
| 805 | INIT_LIST_HEAD(&new->hidden_list); |
| 806 | |
| 807 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
| 808 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); |
| 809 | if (!hidden) |
| 810 | hidden = rb_find_bss(dev, tmp, |
| 811 | BSS_CMP_HIDE_NUL); |
| 812 | if (hidden) { |
| 813 | new->pub.hidden_beacon_bss = &hidden->pub; |
| 814 | list_add(&new->hidden_list, |
| 815 | &hidden->hidden_list); |
| 816 | hidden->refcount++; |
| 817 | rcu_assign_pointer(new->pub.beacon_ies, |
| 818 | hidden->pub.beacon_ies); |
| 819 | } |
| 820 | } else { |
| 821 | /* |
| 822 | * Ok so we found a beacon, and don't have an entry. If |
| 823 | * it's a beacon with hidden SSID, we might be in for an |
| 824 | * expensive search for any probe responses that should |
| 825 | * be grouped with this beacon for updates ... |
| 826 | */ |
| 827 | if (!cfg80211_combine_bsses(dev, new)) { |
| 828 | kfree(new); |
| 829 | goto drop; |
| 830 | } |
| 831 | } |
| 832 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 833 | list_add_tail(&new->list, &dev->bss_list); |
| 834 | rb_insert_bss(dev, new); |
| 835 | found = new; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | dev->bss_generation++; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 839 | bss_ref_get(dev, found); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 840 | spin_unlock_bh(&dev->bss_lock); |
| 841 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 842 | return found; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 843 | drop: |
| 844 | spin_unlock_bh(&dev->bss_lock); |
| 845 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 846 | } |
| 847 | |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 848 | static struct ieee80211_channel * |
| 849 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, |
| 850 | struct ieee80211_channel *channel) |
| 851 | { |
| 852 | const u8 *tmp; |
| 853 | u32 freq; |
| 854 | int channel_number = -1; |
| 855 | |
| 856 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); |
| 857 | if (tmp && tmp[1] == 1) { |
| 858 | channel_number = tmp[2]; |
| 859 | } else { |
| 860 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); |
| 861 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { |
| 862 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); |
| 863 | |
| 864 | channel_number = htop->primary_chan; |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | if (channel_number < 0) |
| 869 | return channel; |
| 870 | |
| 871 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); |
| 872 | channel = ieee80211_get_channel(wiphy, freq); |
| 873 | if (!channel) |
| 874 | return NULL; |
| 875 | if (channel->flags & IEEE80211_CHAN_DISABLED) |
| 876 | return NULL; |
| 877 | return channel; |
| 878 | } |
| 879 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 880 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 881 | struct cfg80211_bss* |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 882 | cfg80211_inform_bss_width(struct wiphy *wiphy, |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 883 | struct ieee80211_channel *rx_channel, |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 884 | enum nl80211_bss_scan_width scan_width, |
| 885 | const u8 *bssid, u64 tsf, u16 capability, |
| 886 | u16 beacon_interval, const u8 *ie, size_t ielen, |
| 887 | s32 signal, gfp_t gfp) |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 888 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 889 | struct cfg80211_bss_ies *ies; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 890 | struct ieee80211_channel *channel; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 891 | struct cfg80211_internal_bss tmp = {}, *res; |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 892 | |
| 893 | if (WARN_ON(!wiphy)) |
| 894 | return NULL; |
| 895 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 896 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 897 | (signal < 0 || signal > 100))) |
| 898 | return NULL; |
| 899 | |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 900 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel); |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 901 | if (!channel) |
| 902 | return NULL; |
| 903 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 904 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
| 905 | tmp.pub.channel = channel; |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 906 | tmp.pub.scan_width = scan_width; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 907 | tmp.pub.signal = signal; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 908 | tmp.pub.beacon_interval = beacon_interval; |
| 909 | tmp.pub.capability = capability; |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 910 | /* |
| 911 | * Since we do not know here whether the IEs are from a Beacon or Probe |
| 912 | * Response frame, we need to pick one of the options and only use it |
| 913 | * with the driver that does not provide the full Beacon/Probe Response |
| 914 | * frame. Use Beacon frame pointer to avoid indicating that this should |
Johannes Berg | 50521aa | 2013-01-30 21:33:19 +0100 | [diff] [blame] | 915 | * override the IEs pointer should we have received an earlier |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 916 | * indication of Probe Response data. |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 917 | */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 918 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
| 919 | if (!ies) |
| 920 | return NULL; |
| 921 | ies->len = ielen; |
Johannes Berg | 8cef2c9 | 2013-02-05 16:54:31 +0100 | [diff] [blame] | 922 | ies->tsf = tsf; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 923 | memcpy(ies->data, ie, ielen); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 924 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 925 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
| 926 | rcu_assign_pointer(tmp.pub.ies, ies); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 927 | |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 928 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, |
| 929 | rx_channel == channel); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 930 | if (!res) |
| 931 | return NULL; |
| 932 | |
| 933 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 934 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 935 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 936 | trace_cfg80211_return_bss(&res->pub); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 937 | /* cfg80211_bss_update gives us a referenced result */ |
| 938 | return &res->pub; |
| 939 | } |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 940 | EXPORT_SYMBOL(cfg80211_inform_bss_width); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 941 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 942 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 943 | struct cfg80211_bss * |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 944 | cfg80211_inform_bss_width_frame(struct wiphy *wiphy, |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 945 | struct ieee80211_channel *rx_channel, |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 946 | enum nl80211_bss_scan_width scan_width, |
| 947 | struct ieee80211_mgmt *mgmt, size_t len, |
| 948 | s32 signal, gfp_t gfp) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 949 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 950 | struct cfg80211_internal_bss tmp = {}, *res; |
| 951 | struct cfg80211_bss_ies *ies; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 952 | struct ieee80211_channel *channel; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 953 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
| 954 | u.probe_resp.variable); |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 955 | |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 956 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
| 957 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); |
| 958 | |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 959 | trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt, |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 960 | len, signal); |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 961 | |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 962 | if (WARN_ON(!mgmt)) |
| 963 | return NULL; |
| 964 | |
| 965 | if (WARN_ON(!wiphy)) |
| 966 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 967 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 968 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Hila Gonen | 768be59 | 2012-08-26 11:00:28 +0300 | [diff] [blame] | 969 | (signal < 0 || signal > 100))) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 970 | return NULL; |
| 971 | |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 972 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 973 | return NULL; |
| 974 | |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 975 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 976 | ielen, rx_channel); |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 977 | if (!channel) |
| 978 | return NULL; |
| 979 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 980 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
| 981 | if (!ies) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 982 | return NULL; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 983 | ies->len = ielen; |
Johannes Berg | 8cef2c9 | 2013-02-05 16:54:31 +0100 | [diff] [blame] | 984 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 985 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 986 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 987 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
| 988 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); |
| 989 | else |
| 990 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
| 991 | rcu_assign_pointer(tmp.pub.ies, ies); |
| 992 | |
| 993 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
| 994 | tmp.pub.channel = channel; |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 995 | tmp.pub.scan_width = scan_width; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 996 | tmp.pub.signal = signal; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 997 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
| 998 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 999 | |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 1000 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, |
| 1001 | rx_channel == channel); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1002 | if (!res) |
| 1003 | return NULL; |
| 1004 | |
Luis R. Rodriguez | e38f8a7 | 2009-02-21 00:20:39 -0500 | [diff] [blame] | 1005 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 1006 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 1007 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 1008 | trace_cfg80211_return_bss(&res->pub); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1009 | /* cfg80211_bss_update gives us a referenced result */ |
| 1010 | return &res->pub; |
| 1011 | } |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 1012 | EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1013 | |
Johannes Berg | 5b112d3 | 2013-02-01 01:49:58 +0100 | [diff] [blame] | 1014 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1015 | { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1016 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1017 | struct cfg80211_internal_bss *bss; |
| 1018 | |
| 1019 | if (!pub) |
| 1020 | return; |
| 1021 | |
| 1022 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1023 | |
| 1024 | spin_lock_bh(&dev->bss_lock); |
| 1025 | bss_ref_get(dev, bss); |
| 1026 | spin_unlock_bh(&dev->bss_lock); |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1027 | } |
| 1028 | EXPORT_SYMBOL(cfg80211_ref_bss); |
| 1029 | |
Johannes Berg | 5b112d3 | 2013-02-01 01:49:58 +0100 | [diff] [blame] | 1030 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1031 | { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1032 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1033 | struct cfg80211_internal_bss *bss; |
| 1034 | |
| 1035 | if (!pub) |
| 1036 | return; |
| 1037 | |
| 1038 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1039 | |
| 1040 | spin_lock_bh(&dev->bss_lock); |
| 1041 | bss_ref_put(dev, bss); |
| 1042 | spin_unlock_bh(&dev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1043 | } |
| 1044 | EXPORT_SYMBOL(cfg80211_put_bss); |
| 1045 | |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1046 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
| 1047 | { |
| 1048 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 1049 | struct cfg80211_internal_bss *bss; |
| 1050 | |
| 1051 | if (WARN_ON(!pub)) |
| 1052 | return; |
| 1053 | |
| 1054 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 1055 | |
| 1056 | spin_lock_bh(&dev->bss_lock); |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 1057 | if (!list_empty(&bss->list)) { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1058 | if (__cfg80211_unlink_bss(dev, bss)) |
| 1059 | dev->bss_generation++; |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 1060 | } |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1061 | spin_unlock_bh(&dev->bss_lock); |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1062 | } |
| 1063 | EXPORT_SYMBOL(cfg80211_unlink_bss); |
| 1064 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 1065 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1066 | static struct cfg80211_registered_device * |
| 1067 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) |
| 1068 | { |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1069 | struct cfg80211_registered_device *rdev; |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1070 | struct net_device *dev; |
| 1071 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1072 | ASSERT_RTNL(); |
| 1073 | |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1074 | dev = dev_get_by_index(net, ifindex); |
| 1075 | if (!dev) |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1076 | return ERR_PTR(-ENODEV); |
| 1077 | if (dev->ieee80211_ptr) |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1078 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1079 | else |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1080 | rdev = ERR_PTR(-ENODEV); |
| 1081 | dev_put(dev); |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1082 | return rdev; |
| 1083 | } |
| 1084 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1085 | int cfg80211_wext_siwscan(struct net_device *dev, |
| 1086 | struct iw_request_info *info, |
| 1087 | union iwreq_data *wrqu, char *extra) |
| 1088 | { |
| 1089 | struct cfg80211_registered_device *rdev; |
| 1090 | struct wiphy *wiphy; |
| 1091 | struct iw_scan_req *wreq = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1092 | struct cfg80211_scan_request *creq = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1093 | int i, err, n_channels = 0; |
| 1094 | enum ieee80211_band band; |
| 1095 | |
| 1096 | if (!netif_running(dev)) |
| 1097 | return -ENETDOWN; |
| 1098 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1099 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
| 1100 | wreq = (struct iw_scan_req *)extra; |
| 1101 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1102 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1103 | |
| 1104 | if (IS_ERR(rdev)) |
| 1105 | return PTR_ERR(rdev); |
| 1106 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 1107 | if (rdev->scan_req || rdev->scan_msg) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1108 | err = -EBUSY; |
| 1109 | goto out; |
| 1110 | } |
| 1111 | |
| 1112 | wiphy = &rdev->wiphy; |
| 1113 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1114 | /* Determine number of channels, needed to allocate creq */ |
| 1115 | if (wreq && wreq->num_channels) |
| 1116 | n_channels = wreq->num_channels; |
Ilan Peer | bdfbec2 | 2014-01-09 11:37:23 +0200 | [diff] [blame] | 1117 | else |
| 1118 | n_channels = ieee80211_get_num_supported_channels(wiphy); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1119 | |
| 1120 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + |
| 1121 | n_channels * sizeof(void *), |
| 1122 | GFP_ATOMIC); |
| 1123 | if (!creq) { |
| 1124 | err = -ENOMEM; |
| 1125 | goto out; |
| 1126 | } |
| 1127 | |
| 1128 | creq->wiphy = wiphy; |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 1129 | creq->wdev = dev->ieee80211_ptr; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 1130 | /* SSIDs come after channels */ |
| 1131 | creq->ssids = (void *)&creq->channels[n_channels]; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1132 | creq->n_channels = n_channels; |
| 1133 | creq->n_ssids = 1; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 1134 | creq->scan_start = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1135 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1136 | /* translate "Scan on frequencies" request */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1137 | i = 0; |
| 1138 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 1139 | int j; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1140 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1141 | if (!wiphy->bands[band]) |
| 1142 | continue; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1143 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1144 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1145 | /* ignore disabled channels */ |
| 1146 | if (wiphy->bands[band]->channels[j].flags & |
| 1147 | IEEE80211_CHAN_DISABLED) |
| 1148 | continue; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1149 | |
| 1150 | /* If we have a wireless request structure and the |
| 1151 | * wireless request specifies frequencies, then search |
| 1152 | * for the matching hardware channel. |
| 1153 | */ |
| 1154 | if (wreq && wreq->num_channels) { |
| 1155 | int k; |
| 1156 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; |
| 1157 | for (k = 0; k < wreq->num_channels; k++) { |
Holger Schurig | a4e7b73 | 2009-09-11 10:13:53 +0200 | [diff] [blame] | 1158 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1159 | if (wext_freq == wiphy_freq) |
| 1160 | goto wext_freq_found; |
| 1161 | } |
| 1162 | goto wext_freq_not_found; |
| 1163 | } |
| 1164 | |
| 1165 | wext_freq_found: |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1166 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
| 1167 | i++; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1168 | wext_freq_not_found: ; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1169 | } |
| 1170 | } |
Holger Schurig | 8862dc5 | 2009-09-11 10:13:55 +0200 | [diff] [blame] | 1171 | /* No channels found? */ |
| 1172 | if (!i) { |
| 1173 | err = -EINVAL; |
| 1174 | goto out; |
| 1175 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1176 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1177 | /* Set real number of channels specified in creq->channels[] */ |
| 1178 | creq->n_channels = i; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1179 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1180 | /* translate "Scan for SSID" request */ |
| 1181 | if (wreq) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1182 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1183 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
| 1184 | err = -EINVAL; |
| 1185 | goto out; |
| 1186 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1187 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
| 1188 | creq->ssids[0].ssid_len = wreq->essid_len; |
| 1189 | } |
| 1190 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) |
| 1191 | creq->n_ssids = 0; |
| 1192 | } |
| 1193 | |
Johannes Berg | 34850ab | 2011-07-18 18:08:35 +0200 | [diff] [blame] | 1194 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
Johannes Berg | a401d2b | 2011-07-20 00:52:16 +0200 | [diff] [blame] | 1195 | if (wiphy->bands[i]) |
| 1196 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; |
Johannes Berg | 34850ab | 2011-07-18 18:08:35 +0200 | [diff] [blame] | 1197 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1198 | rdev->scan_req = creq; |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 1199 | err = rdev_scan(rdev, creq); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1200 | if (err) { |
| 1201 | rdev->scan_req = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1202 | /* creq will be freed below */ |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1203 | } else { |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 1204 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1205 | /* creq now owned by driver */ |
| 1206 | creq = NULL; |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1207 | dev_hold(dev); |
| 1208 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1209 | out: |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1210 | kfree(creq); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1211 | return err; |
| 1212 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 1213 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1214 | |
| 1215 | static void ieee80211_scan_add_ies(struct iw_request_info *info, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1216 | const struct cfg80211_bss_ies *ies, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1217 | char **current_ev, char *end_buf) |
| 1218 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1219 | const u8 *pos, *end, *next; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1220 | struct iw_event iwe; |
| 1221 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1222 | if (!ies) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1223 | return; |
| 1224 | |
| 1225 | /* |
| 1226 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
| 1227 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
| 1228 | */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1229 | pos = ies->data; |
| 1230 | end = pos + ies->len; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1231 | |
| 1232 | while (end - pos > IW_GENERIC_IE_MAX) { |
| 1233 | next = pos + 2 + pos[1]; |
| 1234 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
| 1235 | next = next + 2 + next[1]; |
| 1236 | |
| 1237 | memset(&iwe, 0, sizeof(iwe)); |
| 1238 | iwe.cmd = IWEVGENIE; |
| 1239 | iwe.u.data.length = next - pos; |
| 1240 | *current_ev = iwe_stream_add_point(info, *current_ev, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1241 | end_buf, &iwe, |
| 1242 | (void *)pos); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1243 | |
| 1244 | pos = next; |
| 1245 | } |
| 1246 | |
| 1247 | if (end > pos) { |
| 1248 | memset(&iwe, 0, sizeof(iwe)); |
| 1249 | iwe.cmd = IWEVGENIE; |
| 1250 | iwe.u.data.length = end - pos; |
| 1251 | *current_ev = iwe_stream_add_point(info, *current_ev, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1252 | end_buf, &iwe, |
| 1253 | (void *)pos); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1254 | } |
| 1255 | } |
| 1256 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1257 | static char * |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1258 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
| 1259 | struct cfg80211_internal_bss *bss, char *current_ev, |
| 1260 | char *end_buf) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1261 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1262 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1263 | struct iw_event iwe; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1264 | const u8 *ie; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1265 | u8 *buf, *cfg, *p; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1266 | int rem, i, sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1267 | bool ismesh = false; |
| 1268 | |
| 1269 | memset(&iwe, 0, sizeof(iwe)); |
| 1270 | iwe.cmd = SIOCGIWAP; |
| 1271 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
| 1272 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); |
| 1273 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 1274 | IW_EV_ADDR_LEN); |
| 1275 | |
| 1276 | memset(&iwe, 0, sizeof(iwe)); |
| 1277 | iwe.cmd = SIOCGIWFREQ; |
| 1278 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); |
| 1279 | iwe.u.freq.e = 0; |
| 1280 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 1281 | IW_EV_FREQ_LEN); |
| 1282 | |
| 1283 | memset(&iwe, 0, sizeof(iwe)); |
| 1284 | iwe.cmd = SIOCGIWFREQ; |
| 1285 | iwe.u.freq.m = bss->pub.channel->center_freq; |
| 1286 | iwe.u.freq.e = 6; |
| 1287 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 1288 | IW_EV_FREQ_LEN); |
| 1289 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1290 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1291 | memset(&iwe, 0, sizeof(iwe)); |
| 1292 | iwe.cmd = IWEVQUAL; |
| 1293 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | |
| 1294 | IW_QUAL_NOISE_INVALID | |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1295 | IW_QUAL_QUAL_UPDATED; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1296 | switch (wiphy->signal_type) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1297 | case CFG80211_SIGNAL_TYPE_MBM: |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1298 | sig = bss->pub.signal / 100; |
| 1299 | iwe.u.qual.level = sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1300 | iwe.u.qual.updated |= IW_QUAL_DBM; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1301 | if (sig < -110) /* rather bad */ |
| 1302 | sig = -110; |
| 1303 | else if (sig > -40) /* perfect */ |
| 1304 | sig = -40; |
| 1305 | /* will give a range of 0 .. 70 */ |
| 1306 | iwe.u.qual.qual = sig + 110; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1307 | break; |
| 1308 | case CFG80211_SIGNAL_TYPE_UNSPEC: |
| 1309 | iwe.u.qual.level = bss->pub.signal; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1310 | /* will give range 0 .. 100 */ |
| 1311 | iwe.u.qual.qual = bss->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1312 | break; |
| 1313 | default: |
| 1314 | /* not reached */ |
| 1315 | break; |
| 1316 | } |
| 1317 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 1318 | &iwe, IW_EV_QUAL_LEN); |
| 1319 | } |
| 1320 | |
| 1321 | memset(&iwe, 0, sizeof(iwe)); |
| 1322 | iwe.cmd = SIOCGIWENCODE; |
| 1323 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) |
| 1324 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
| 1325 | else |
| 1326 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
| 1327 | iwe.u.data.length = 0; |
| 1328 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 1329 | &iwe, ""); |
| 1330 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1331 | rcu_read_lock(); |
| 1332 | ies = rcu_dereference(bss->pub.ies); |
Johannes Berg | 83c7aa1 | 2013-02-05 16:51:29 +0100 | [diff] [blame] | 1333 | rem = ies->len; |
| 1334 | ie = ies->data; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1335 | |
Johannes Berg | 83c7aa1 | 2013-02-05 16:51:29 +0100 | [diff] [blame] | 1336 | while (rem >= 2) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1337 | /* invalid data */ |
| 1338 | if (ie[1] > rem - 2) |
| 1339 | break; |
| 1340 | |
| 1341 | switch (ie[0]) { |
| 1342 | case WLAN_EID_SSID: |
| 1343 | memset(&iwe, 0, sizeof(iwe)); |
| 1344 | iwe.cmd = SIOCGIWESSID; |
| 1345 | iwe.u.data.length = ie[1]; |
| 1346 | iwe.u.data.flags = 1; |
| 1347 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1348 | &iwe, (u8 *)ie + 2); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1349 | break; |
| 1350 | case WLAN_EID_MESH_ID: |
| 1351 | memset(&iwe, 0, sizeof(iwe)); |
| 1352 | iwe.cmd = SIOCGIWESSID; |
| 1353 | iwe.u.data.length = ie[1]; |
| 1354 | iwe.u.data.flags = 1; |
| 1355 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1356 | &iwe, (u8 *)ie + 2); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1357 | break; |
| 1358 | case WLAN_EID_MESH_CONFIG: |
| 1359 | ismesh = true; |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 1360 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1361 | break; |
| 1362 | buf = kmalloc(50, GFP_ATOMIC); |
| 1363 | if (!buf) |
| 1364 | break; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1365 | cfg = (u8 *)ie + 2; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1366 | memset(&iwe, 0, sizeof(iwe)); |
| 1367 | iwe.cmd = IWEVCUSTOM; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1368 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
| 1369 | "0x%02X", cfg[0]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1370 | iwe.u.data.length = strlen(buf); |
| 1371 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1372 | end_buf, |
| 1373 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1374 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
| 1375 | cfg[1]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1376 | iwe.u.data.length = strlen(buf); |
| 1377 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1378 | end_buf, |
| 1379 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1380 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
| 1381 | cfg[2]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1382 | iwe.u.data.length = strlen(buf); |
| 1383 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1384 | end_buf, |
| 1385 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1386 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1387 | iwe.u.data.length = strlen(buf); |
| 1388 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1389 | end_buf, |
| 1390 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1391 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
| 1392 | iwe.u.data.length = strlen(buf); |
| 1393 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1394 | end_buf, |
| 1395 | &iwe, buf); |
| 1396 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
| 1397 | iwe.u.data.length = strlen(buf); |
| 1398 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1399 | end_buf, |
| 1400 | &iwe, buf); |
| 1401 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1402 | iwe.u.data.length = strlen(buf); |
| 1403 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1404 | end_buf, |
| 1405 | &iwe, buf); |
| 1406 | kfree(buf); |
| 1407 | break; |
| 1408 | case WLAN_EID_SUPP_RATES: |
| 1409 | case WLAN_EID_EXT_SUPP_RATES: |
| 1410 | /* display all supported rates in readable format */ |
| 1411 | p = current_ev + iwe_stream_lcp_len(info); |
| 1412 | |
| 1413 | memset(&iwe, 0, sizeof(iwe)); |
| 1414 | iwe.cmd = SIOCGIWRATE; |
| 1415 | /* Those two flags are ignored... */ |
| 1416 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
| 1417 | |
| 1418 | for (i = 0; i < ie[1]; i++) { |
| 1419 | iwe.u.bitrate.value = |
| 1420 | ((ie[i + 2] & 0x7f) * 500000); |
| 1421 | p = iwe_stream_add_value(info, current_ev, p, |
| 1422 | end_buf, &iwe, IW_EV_PARAM_LEN); |
| 1423 | } |
| 1424 | current_ev = p; |
| 1425 | break; |
| 1426 | } |
| 1427 | rem -= ie[1] + 2; |
| 1428 | ie += ie[1] + 2; |
| 1429 | } |
| 1430 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1431 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
| 1432 | ismesh) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1433 | memset(&iwe, 0, sizeof(iwe)); |
| 1434 | iwe.cmd = SIOCGIWMODE; |
| 1435 | if (ismesh) |
| 1436 | iwe.u.mode = IW_MODE_MESH; |
| 1437 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) |
| 1438 | iwe.u.mode = IW_MODE_MASTER; |
| 1439 | else |
| 1440 | iwe.u.mode = IW_MODE_ADHOC; |
| 1441 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 1442 | &iwe, IW_EV_UINT_LEN); |
| 1443 | } |
| 1444 | |
Dan Carpenter | c49dc90 | 2013-01-24 09:40:00 +0300 | [diff] [blame] | 1445 | buf = kmalloc(31, GFP_ATOMIC); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1446 | if (buf) { |
| 1447 | memset(&iwe, 0, sizeof(iwe)); |
| 1448 | iwe.cmd = IWEVCUSTOM; |
Johannes Berg | 8cef2c9 | 2013-02-05 16:54:31 +0100 | [diff] [blame] | 1449 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1450 | iwe.u.data.length = strlen(buf); |
| 1451 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 1452 | &iwe, buf); |
| 1453 | memset(&iwe, 0, sizeof(iwe)); |
| 1454 | iwe.cmd = IWEVCUSTOM; |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 1455 | sprintf(buf, " Last beacon: %ums ago", |
| 1456 | elapsed_jiffies_msecs(bss->ts)); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1457 | iwe.u.data.length = strlen(buf); |
| 1458 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1459 | end_buf, &iwe, buf); |
| 1460 | kfree(buf); |
| 1461 | } |
| 1462 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1463 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
| 1464 | rcu_read_unlock(); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1465 | |
| 1466 | return current_ev; |
| 1467 | } |
| 1468 | |
| 1469 | |
| 1470 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, |
| 1471 | struct iw_request_info *info, |
| 1472 | char *buf, size_t len) |
| 1473 | { |
| 1474 | char *current_ev = buf; |
| 1475 | char *end_buf = buf + len; |
| 1476 | struct cfg80211_internal_bss *bss; |
| 1477 | |
| 1478 | spin_lock_bh(&dev->bss_lock); |
| 1479 | cfg80211_bss_expire(dev); |
| 1480 | |
| 1481 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 1482 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
| 1483 | spin_unlock_bh(&dev->bss_lock); |
| 1484 | return -E2BIG; |
| 1485 | } |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1486 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
| 1487 | current_ev, end_buf); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1488 | } |
| 1489 | spin_unlock_bh(&dev->bss_lock); |
| 1490 | return current_ev - buf; |
| 1491 | } |
| 1492 | |
| 1493 | |
| 1494 | int cfg80211_wext_giwscan(struct net_device *dev, |
| 1495 | struct iw_request_info *info, |
| 1496 | struct iw_point *data, char *extra) |
| 1497 | { |
| 1498 | struct cfg80211_registered_device *rdev; |
| 1499 | int res; |
| 1500 | |
| 1501 | if (!netif_running(dev)) |
| 1502 | return -ENETDOWN; |
| 1503 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1504 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1505 | |
| 1506 | if (IS_ERR(rdev)) |
| 1507 | return PTR_ERR(rdev); |
| 1508 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 1509 | if (rdev->scan_req || rdev->scan_msg) |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1510 | return -EAGAIN; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1511 | |
| 1512 | res = ieee80211_scan_results(rdev, info, extra, data->length); |
| 1513 | data->length = 0; |
| 1514 | if (res >= 0) { |
| 1515 | data->length = res; |
| 1516 | res = 0; |
| 1517 | } |
| 1518 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1519 | return res; |
| 1520 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 1521 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1522 | #endif |