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> |
Johannes Berg | 2740f0c | 2014-09-03 15:24:58 +0300 | [diff] [blame] | 5 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 6 | * Copyright 2016 Intel Deutschland GmbH |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 7 | */ |
| 8 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 9 | #include <linux/slab.h> |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/netdevice.h> |
| 12 | #include <linux/wireless.h> |
| 13 | #include <linux/nl80211.h> |
| 14 | #include <linux/etherdevice.h> |
| 15 | #include <net/arp.h> |
| 16 | #include <net/cfg80211.h> |
Johannes Berg | 262eb9b2 | 2011-07-13 10:39:09 +0200 | [diff] [blame] | 17 | #include <net/cfg80211-wext.h> |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 18 | #include <net/iw_handler.h> |
| 19 | #include "core.h" |
| 20 | #include "nl80211.h" |
Johannes Berg | a9a1162 | 2009-07-27 12:01:53 +0200 | [diff] [blame] | 21 | #include "wext-compat.h" |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 22 | #include "rdev-ops.h" |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 23 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 24 | /** |
| 25 | * DOC: BSS tree/list structure |
| 26 | * |
| 27 | * At the top level, the BSS list is kept in both a list in each |
| 28 | * registered device (@bss_list) as well as an RB-tree for faster |
| 29 | * lookup. In the RB-tree, entries can be looked up using their |
| 30 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID |
| 31 | * for other BSSes. |
| 32 | * |
| 33 | * Due to the possibility of hidden SSIDs, there's a second level |
| 34 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. |
| 35 | * The hidden_list connects all BSSes belonging to a single AP |
| 36 | * that has a hidden SSID, and connects beacon and probe response |
| 37 | * entries. For a probe response entry for a hidden SSID, the |
| 38 | * hidden_beacon_bss pointer points to the BSS struct holding the |
| 39 | * beacon's information. |
| 40 | * |
| 41 | * Reference counting is done for all these references except for |
| 42 | * the hidden_list, so that a beacon BSS struct that is otherwise |
| 43 | * not referenced has one reference for being on the bss_list and |
| 44 | * one for each probe response entry that points to it using the |
| 45 | * hidden_beacon_bss pointer. When a BSS struct that has such a |
| 46 | * pointer is get/put, the refcount update is also propagated to |
| 47 | * the referenced struct, this ensure that it cannot get removed |
| 48 | * while somebody is using the probe response version. |
| 49 | * |
| 50 | * Note that the hidden_beacon_bss pointer never changes, due to |
| 51 | * the reference counting. Therefore, no locking is needed for |
| 52 | * it. |
| 53 | * |
| 54 | * Also note that the hidden_beacon_bss pointer is only relevant |
| 55 | * if the driver uses something other than the IEs, e.g. private |
| 56 | * data stored stored in the BSS struct, since the beacon IEs are |
| 57 | * also linked into the probe response struct. |
| 58 | */ |
| 59 | |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 60 | /* |
| 61 | * Limit the number of BSS entries stored in mac80211. Each one is |
| 62 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. |
| 63 | * If somebody wants to really attack this though, they'd likely |
| 64 | * use small beacons, and only one type of frame, limiting each of |
| 65 | * the entries to a much smaller size (in order to generate more |
| 66 | * entries in total, so overhead is bigger.) |
| 67 | */ |
| 68 | static int bss_entries_limit = 1000; |
| 69 | module_param(bss_entries_limit, int, 0644); |
| 70 | MODULE_PARM_DESC(bss_entries_limit, |
| 71 | "limit to number of scan BSS entries (per wiphy, default 1000)"); |
| 72 | |
Dmitry Shmidt | 9d0c7e6 | 2014-06-24 09:36:50 -0700 | [diff] [blame] | 73 | #define IEEE80211_SCAN_RESULT_EXPIRE (7 * HZ) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 74 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 75 | static void bss_free(struct cfg80211_internal_bss *bss) |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 76 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 77 | struct cfg80211_bss_ies *ies; |
Johannes Berg | b629ea3 | 2012-11-28 22:14:56 +0100 | [diff] [blame] | 78 | |
| 79 | if (WARN_ON(atomic_read(&bss->hold))) |
| 80 | return; |
| 81 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 82 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 83 | if (ies && !bss->pub.hidden_beacon_bss) |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 84 | kfree_rcu(ies, rcu_head); |
| 85 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); |
| 86 | if (ies) |
| 87 | kfree_rcu(ies, rcu_head); |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 88 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 89 | /* |
| 90 | * This happens when the module is removed, it doesn't |
| 91 | * really matter any more save for completeness |
| 92 | */ |
| 93 | if (!list_empty(&bss->hidden_list)) |
| 94 | list_del(&bss->hidden_list); |
| 95 | |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 96 | kfree(bss); |
| 97 | } |
| 98 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 99 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 100 | struct cfg80211_internal_bss *bss) |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 101 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 102 | lockdep_assert_held(&rdev->bss_lock); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 103 | |
| 104 | bss->refcount++; |
| 105 | if (bss->pub.hidden_beacon_bss) { |
| 106 | bss = container_of(bss->pub.hidden_beacon_bss, |
| 107 | struct cfg80211_internal_bss, |
| 108 | pub); |
| 109 | bss->refcount++; |
| 110 | } |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 111 | } |
| 112 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 113 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 114 | struct cfg80211_internal_bss *bss) |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 115 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 116 | lockdep_assert_held(&rdev->bss_lock); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 117 | |
| 118 | if (bss->pub.hidden_beacon_bss) { |
| 119 | struct cfg80211_internal_bss *hbss; |
| 120 | hbss = container_of(bss->pub.hidden_beacon_bss, |
| 121 | struct cfg80211_internal_bss, |
| 122 | pub); |
| 123 | hbss->refcount--; |
| 124 | if (hbss->refcount == 0) |
| 125 | bss_free(hbss); |
| 126 | } |
| 127 | bss->refcount--; |
| 128 | if (bss->refcount == 0) |
| 129 | bss_free(bss); |
Johannes Berg | 0532d4f | 2013-02-01 01:34:36 +0100 | [diff] [blame] | 130 | } |
| 131 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 132 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 133 | struct cfg80211_internal_bss *bss) |
| 134 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 135 | lockdep_assert_held(&rdev->bss_lock); |
Johannes Berg | 4b1af47 | 2013-02-01 01:05:43 +0100 | [diff] [blame] | 136 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 137 | if (!list_empty(&bss->hidden_list)) { |
| 138 | /* |
| 139 | * don't remove the beacon entry if it has |
| 140 | * probe responses associated with it |
| 141 | */ |
| 142 | if (!bss->pub.hidden_beacon_bss) |
| 143 | return false; |
| 144 | /* |
| 145 | * if it's a probe response entry break its |
| 146 | * link to the other entries in the group |
| 147 | */ |
| 148 | list_del_init(&bss->hidden_list); |
| 149 | } |
| 150 | |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 151 | list_del_init(&bss->list); |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 152 | rb_erase(&bss->rbn, &rdev->bss_tree); |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 153 | rdev->bss_entries--; |
| 154 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), |
| 155 | "rdev bss entries[%d]/list[empty:%d] corruption\n", |
| 156 | rdev->bss_entries, list_empty(&rdev->bss_list)); |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 157 | bss_ref_put(rdev, bss); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 158 | return true; |
Amitkumar Karwar | e8e27c6 | 2012-10-11 21:03:33 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 161 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 162 | unsigned long expire_time) |
| 163 | { |
| 164 | struct cfg80211_internal_bss *bss, *tmp; |
| 165 | bool expired = false; |
| 166 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 167 | lockdep_assert_held(&rdev->bss_lock); |
Johannes Berg | 4b1af47 | 2013-02-01 01:05:43 +0100 | [diff] [blame] | 168 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 169 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 170 | if (atomic_read(&bss->hold)) |
| 171 | continue; |
| 172 | if (!time_after(expire_time, bss->ts)) |
| 173 | continue; |
| 174 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 175 | if (__cfg80211_unlink_bss(rdev, bss)) |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 176 | expired = true; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | if (expired) |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 180 | rdev->bss_generation++; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 181 | } |
| 182 | |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 183 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
| 184 | { |
| 185 | struct cfg80211_internal_bss *bss, *oldest = NULL; |
| 186 | bool ret; |
| 187 | |
| 188 | lockdep_assert_held(&rdev->bss_lock); |
| 189 | |
| 190 | list_for_each_entry(bss, &rdev->bss_list, list) { |
| 191 | if (atomic_read(&bss->hold)) |
| 192 | continue; |
| 193 | |
| 194 | if (!list_empty(&bss->hidden_list) && |
| 195 | !bss->pub.hidden_beacon_bss) |
| 196 | continue; |
| 197 | |
| 198 | if (oldest && time_before(oldest->ts, bss->ts)) |
| 199 | continue; |
| 200 | oldest = bss; |
| 201 | } |
| 202 | |
| 203 | if (WARN_ON(!oldest)) |
| 204 | return false; |
| 205 | |
| 206 | /* |
| 207 | * The callers make sure to increase rdev->bss_generation if anything |
| 208 | * gets removed (and a new entry added), so there's no need to also do |
| 209 | * it here. |
| 210 | */ |
| 211 | |
| 212 | ret = __cfg80211_unlink_bss(rdev, oldest); |
| 213 | WARN_ON(!ret); |
| 214 | return ret; |
| 215 | } |
| 216 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 217 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
| 218 | bool send_message) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 219 | { |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 220 | struct cfg80211_scan_request *request; |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 221 | struct wireless_dev *wdev; |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 222 | struct sk_buff *msg; |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 223 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 224 | union iwreq_data wrqu; |
| 225 | #endif |
| 226 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 227 | ASSERT_RTNL(); |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 228 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 229 | if (rdev->scan_msg) { |
| 230 | nl80211_send_scan_result(rdev, rdev->scan_msg); |
| 231 | rdev->scan_msg = NULL; |
| 232 | return; |
| 233 | } |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 234 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 235 | request = rdev->scan_req; |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 236 | if (!request) |
| 237 | return; |
| 238 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 239 | wdev = request->wdev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 240 | |
Johannes Berg | 6829c87 | 2009-07-02 09:13:27 +0200 | [diff] [blame] | 241 | /* |
| 242 | * This must be before sending the other events! |
| 243 | * Otherwise, wpa_supplicant gets completely confused with |
| 244 | * wext events. |
| 245 | */ |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 246 | if (wdev->netdev) |
| 247 | cfg80211_sme_scan_done(wdev->netdev); |
Johannes Berg | 6829c87 | 2009-07-02 09:13:27 +0200 | [diff] [blame] | 248 | |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 249 | if (!request->info.aborted && |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 250 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
| 251 | /* flush entries from previous scans */ |
| 252 | spin_lock_bh(&rdev->bss_lock); |
| 253 | __cfg80211_bss_expire(rdev, request->scan_start); |
| 254 | spin_unlock_bh(&rdev->bss_lock); |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 255 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 256 | |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 257 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 258 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 259 | #ifdef CONFIG_CFG80211_WEXT |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 260 | if (wdev->netdev && !request->info.aborted) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 261 | memset(&wrqu, 0, sizeof(wrqu)); |
| 262 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 263 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 264 | } |
| 265 | #endif |
| 266 | |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 267 | if (wdev->netdev) |
| 268 | dev_put(wdev->netdev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 269 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 270 | rdev->scan_req = NULL; |
Eliad Peller | 4a58e7c | 2013-12-05 18:30:17 +0200 | [diff] [blame] | 271 | kfree(request); |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 272 | |
| 273 | if (!send_message) |
| 274 | rdev->scan_msg = msg; |
| 275 | else |
| 276 | nl80211_send_scan_result(rdev, msg); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 277 | } |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 278 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 279 | void __cfg80211_scan_done(struct work_struct *wk) |
| 280 | { |
| 281 | struct cfg80211_registered_device *rdev; |
| 282 | |
| 283 | rdev = container_of(wk, struct cfg80211_registered_device, |
| 284 | scan_done_wk); |
| 285 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 286 | rtnl_lock(); |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 287 | ___cfg80211_scan_done(rdev, true); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 288 | rtnl_unlock(); |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 289 | } |
| 290 | |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 291 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
| 292 | struct cfg80211_scan_info *info) |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 293 | { |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 294 | trace_cfg80211_scan_done(request, info); |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 295 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 296 | |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 297 | request->info = *info; |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 298 | request->notified = true; |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 299 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 300 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 301 | EXPORT_SYMBOL(cfg80211_scan_done); |
| 302 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 303 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
| 304 | { |
| 305 | struct cfg80211_registered_device *rdev; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 306 | struct cfg80211_sched_scan_request *request; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 307 | |
| 308 | rdev = container_of(wk, struct cfg80211_registered_device, |
| 309 | sched_scan_results_wk); |
| 310 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 311 | rtnl_lock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 312 | |
Jukka Rissanen | 31a60ed | 2014-12-15 13:25:38 +0200 | [diff] [blame] | 313 | request = rtnl_dereference(rdev->sched_scan_req); |
Johannes Berg | 79845c6 | 2013-10-21 11:33:35 +0200 | [diff] [blame] | 314 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 315 | /* 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] | 316 | if (request) { |
| 317 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { |
| 318 | /* flush entries from previous scans */ |
| 319 | spin_lock_bh(&rdev->bss_lock); |
| 320 | __cfg80211_bss_expire(rdev, request->scan_start); |
| 321 | spin_unlock_bh(&rdev->bss_lock); |
Avraham Stern | 3b06d27 | 2015-10-12 09:51:34 +0300 | [diff] [blame] | 322 | request->scan_start = jiffies; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 323 | } |
| 324 | nl80211_send_sched_scan_results(rdev, request->dev); |
| 325 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 326 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 327 | rtnl_unlock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | void cfg80211_sched_scan_results(struct wiphy *wiphy) |
| 331 | { |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 332 | trace_cfg80211_sched_scan_results(wiphy); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 333 | /* ignore if we're not scanning */ |
Jukka Rissanen | 31a60ed | 2014-12-15 13:25:38 +0200 | [diff] [blame] | 334 | |
| 335 | if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req)) |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 336 | queue_work(cfg80211_wq, |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 337 | &wiphy_to_rdev(wiphy)->sched_scan_results_wk); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 338 | } |
| 339 | EXPORT_SYMBOL(cfg80211_sched_scan_results); |
| 340 | |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 341 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 342 | { |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 343 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 344 | |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 345 | ASSERT_RTNL(); |
| 346 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 347 | trace_cfg80211_sched_scan_stopped(wiphy); |
| 348 | |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 349 | __cfg80211_stop_sched_scan(rdev, true); |
Eliad Peller | 792e6aa | 2014-04-30 16:14:23 +0300 | [diff] [blame] | 350 | } |
| 351 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); |
| 352 | |
| 353 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
| 354 | { |
| 355 | rtnl_lock(); |
| 356 | cfg80211_sched_scan_stopped_rtnl(wiphy); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 357 | rtnl_unlock(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 358 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 359 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
| 360 | |
| 361 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
| 362 | bool driver_initiated) |
| 363 | { |
Jukka Rissanen | 31a60ed | 2014-12-15 13:25:38 +0200 | [diff] [blame] | 364 | struct cfg80211_sched_scan_request *sched_scan_req; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 365 | struct net_device *dev; |
| 366 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 367 | ASSERT_RTNL(); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 368 | |
| 369 | if (!rdev->sched_scan_req) |
Luciano Coelho | 1a84ff7 | 2011-07-08 11:16:16 +0300 | [diff] [blame] | 370 | return -ENOENT; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 371 | |
Jukka Rissanen | 31a60ed | 2014-12-15 13:25:38 +0200 | [diff] [blame] | 372 | sched_scan_req = rtnl_dereference(rdev->sched_scan_req); |
| 373 | dev = sched_scan_req->dev; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 374 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 375 | if (!driver_initiated) { |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 376 | int err = rdev_sched_scan_stop(rdev, dev); |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 377 | if (err) |
| 378 | return err; |
| 379 | } |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 380 | |
| 381 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); |
| 382 | |
Jukka Rissanen | 31a60ed | 2014-12-15 13:25:38 +0200 | [diff] [blame] | 383 | RCU_INIT_POINTER(rdev->sched_scan_req, NULL); |
| 384 | kfree_rcu(sched_scan_req, rcu_head); |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 385 | |
Jesper Juhl | 3b4670f | 2011-06-29 22:49:33 +0200 | [diff] [blame] | 386 | return 0; |
Luciano Coelho | 807f8a8 | 2011-05-11 17:09:35 +0300 | [diff] [blame] | 387 | } |
| 388 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 389 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 390 | unsigned long age_secs) |
| 391 | { |
| 392 | struct cfg80211_internal_bss *bss; |
| 393 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); |
| 394 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 395 | spin_lock_bh(&rdev->bss_lock); |
| 396 | list_for_each_entry(bss, &rdev->bss_list, list) |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 397 | bss->ts -= age_jiffies; |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 398 | spin_unlock_bh(&rdev->bss_lock); |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 399 | } |
| 400 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 401 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 402 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 403 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 404 | } |
| 405 | |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 406 | const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len, |
| 407 | const u8 *match, int match_len, |
| 408 | int match_offset) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 409 | { |
Johannes Berg | c48986f | 2019-02-07 21:44:41 +0100 | [diff] [blame] | 410 | const struct element *elem; |
| 411 | |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 412 | /* match_offset can't be smaller than 2, unless match_len is |
| 413 | * zero, in which case match_offset must be zero as well. |
| 414 | */ |
| 415 | if (WARN_ON((match_len && match_offset < 2) || |
| 416 | (!match_len && match_offset))) |
| 417 | return NULL; |
| 418 | |
Johannes Berg | c48986f | 2019-02-07 21:44:41 +0100 | [diff] [blame] | 419 | for_each_element_id(elem, eid, ies, len) { |
| 420 | if (elem->datalen >= match_offset - 2 + match_len && |
| 421 | !memcmp(elem->data + match_offset - 2, match, match_len)) |
| 422 | return (void *)elem; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 423 | } |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 424 | |
| 425 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 426 | } |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 427 | EXPORT_SYMBOL(cfg80211_find_ie_match); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 428 | |
Emmanuel Grumbach | 9e9ea43 | 2016-05-03 16:08:07 +0300 | [diff] [blame] | 429 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type, |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 430 | const u8 *ies, int len) |
| 431 | { |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 432 | const u8 *ie; |
| 433 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
| 434 | int match_len = (oui_type < 0) ? 3 : sizeof(match); |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 435 | |
Emmanuel Grumbach | 9e9ea43 | 2016-05-03 16:08:07 +0300 | [diff] [blame] | 436 | if (WARN_ON(oui_type > 0xff)) |
| 437 | return NULL; |
| 438 | |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 439 | ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
| 440 | match, match_len, 2); |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 441 | |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 442 | if (ie && (ie[1] < 4)) |
| 443 | return NULL; |
Luciano Coelho | 6719429 | 2013-02-12 20:11:38 +0200 | [diff] [blame] | 444 | |
Luca Coelho | fbd05e4 | 2016-09-15 18:15:09 +0300 | [diff] [blame] | 445 | return ie; |
Eliad Peller | 0c28ec5 | 2011-09-15 11:53:01 +0300 | [diff] [blame] | 446 | } |
| 447 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); |
| 448 | |
Johannes Berg | 915de2f | 2012-11-28 22:39:37 +0100 | [diff] [blame] | 449 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 450 | const u8 *ssid, size_t ssid_len) |
| 451 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 452 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 453 | const u8 *ssidie; |
| 454 | |
Joe Perches | ac422d3 | 2012-05-08 18:56:55 +0000 | [diff] [blame] | 455 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 456 | return false; |
| 457 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 458 | if (!ssid) |
| 459 | return true; |
| 460 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 461 | ies = rcu_access_pointer(a->ies); |
| 462 | if (!ies) |
| 463 | return false; |
| 464 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 465 | if (!ssidie) |
| 466 | return false; |
| 467 | if (ssidie[1] != ssid_len) |
| 468 | return false; |
| 469 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; |
| 470 | } |
| 471 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 472 | /** |
| 473 | * enum bss_compare_mode - BSS compare mode |
| 474 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) |
| 475 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode |
| 476 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode |
| 477 | */ |
| 478 | enum bss_compare_mode { |
| 479 | BSS_CMP_REGULAR, |
| 480 | BSS_CMP_HIDE_ZLEN, |
| 481 | BSS_CMP_HIDE_NUL, |
| 482 | }; |
| 483 | |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 484 | static int cmp_bss(struct cfg80211_bss *a, |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 485 | struct cfg80211_bss *b, |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 486 | enum bss_compare_mode mode) |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 487 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 488 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 489 | const u8 *ie1 = NULL; |
| 490 | const u8 *ie2 = NULL; |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 491 | int i, r; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 492 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 493 | if (a->channel != b->channel) |
| 494 | return b->channel->center_freq - a->channel->center_freq; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 495 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 496 | a_ies = rcu_access_pointer(a->ies); |
| 497 | if (!a_ies) |
| 498 | return -1; |
| 499 | b_ies = rcu_access_pointer(b->ies); |
| 500 | if (!b_ies) |
| 501 | return 1; |
| 502 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 503 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
| 504 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 505 | a_ies->data, a_ies->len); |
| 506 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) |
| 507 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 508 | b_ies->data, b_ies->len); |
| 509 | if (ie1 && ie2) { |
| 510 | int mesh_id_cmp; |
| 511 | |
| 512 | if (ie1[1] == ie2[1]) |
| 513 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
| 514 | else |
| 515 | mesh_id_cmp = ie2[1] - ie1[1]; |
| 516 | |
| 517 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 518 | a_ies->data, a_ies->len); |
| 519 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 520 | b_ies->data, b_ies->len); |
| 521 | if (ie1 && ie2) { |
| 522 | if (mesh_id_cmp) |
| 523 | return mesh_id_cmp; |
| 524 | if (ie1[1] != ie2[1]) |
| 525 | return ie2[1] - ie1[1]; |
| 526 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
| 527 | } |
| 528 | } |
| 529 | |
Johannes Berg | 3af6341 | 2013-01-30 00:40:20 +0100 | [diff] [blame] | 530 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
| 531 | if (r) |
| 532 | return r; |
| 533 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 534 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
| 535 | 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] | 536 | |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 537 | if (!ie1 && !ie2) |
| 538 | return 0; |
| 539 | |
Johannes Berg | f94f8b1 | 2012-11-28 22:42:34 +0100 | [diff] [blame] | 540 | /* |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 541 | * Note that with "hide_ssid", the function returns a match if |
| 542 | * the already-present BSS ("b") is a hidden SSID beacon for |
| 543 | * the new BSS ("a"). |
Johannes Berg | f94f8b1 | 2012-11-28 22:42:34 +0100 | [diff] [blame] | 544 | */ |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 545 | |
| 546 | /* sort missing IE before (left of) present IE */ |
| 547 | if (!ie1) |
| 548 | return -1; |
| 549 | if (!ie2) |
| 550 | return 1; |
| 551 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 552 | switch (mode) { |
| 553 | case BSS_CMP_HIDE_ZLEN: |
| 554 | /* |
| 555 | * In ZLEN mode we assume the BSS entry we're |
| 556 | * looking for has a zero-length SSID. So if |
| 557 | * the one we're looking at right now has that, |
| 558 | * return 0. Otherwise, return the difference |
| 559 | * in length, but since we're looking for the |
| 560 | * 0-length it's really equivalent to returning |
| 561 | * the length of the one we're looking at. |
| 562 | * |
| 563 | * No content comparison is needed as we assume |
| 564 | * the content length is zero. |
| 565 | */ |
| 566 | return ie2[1]; |
| 567 | case BSS_CMP_REGULAR: |
| 568 | default: |
| 569 | /* sort by length first, then by contents */ |
| 570 | if (ie1[1] != ie2[1]) |
| 571 | return ie2[1] - ie1[1]; |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 572 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 573 | case BSS_CMP_HIDE_NUL: |
| 574 | if (ie1[1] != ie2[1]) |
| 575 | return ie2[1] - ie1[1]; |
| 576 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ |
| 577 | for (i = 0; i < ie2[1]; i++) |
| 578 | if (ie2[i + 2]) |
| 579 | return -1; |
| 580 | return 0; |
| 581 | } |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 582 | } |
| 583 | |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 584 | static bool cfg80211_bss_type_match(u16 capability, |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 585 | enum nl80211_band band, |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 586 | enum ieee80211_bss_type bss_type) |
| 587 | { |
| 588 | bool ret = true; |
| 589 | u16 mask, val; |
| 590 | |
| 591 | if (bss_type == IEEE80211_BSS_TYPE_ANY) |
| 592 | return ret; |
| 593 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 594 | if (band == NL80211_BAND_60GHZ) { |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 595 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
| 596 | switch (bss_type) { |
| 597 | case IEEE80211_BSS_TYPE_ESS: |
| 598 | val = WLAN_CAPABILITY_DMG_TYPE_AP; |
| 599 | break; |
| 600 | case IEEE80211_BSS_TYPE_PBSS: |
| 601 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; |
| 602 | break; |
| 603 | case IEEE80211_BSS_TYPE_IBSS: |
| 604 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; |
| 605 | break; |
| 606 | default: |
| 607 | return false; |
| 608 | } |
| 609 | } else { |
| 610 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; |
| 611 | switch (bss_type) { |
| 612 | case IEEE80211_BSS_TYPE_ESS: |
| 613 | val = WLAN_CAPABILITY_ESS; |
| 614 | break; |
| 615 | case IEEE80211_BSS_TYPE_IBSS: |
| 616 | val = WLAN_CAPABILITY_IBSS; |
| 617 | break; |
| 618 | case IEEE80211_BSS_TYPE_MBSS: |
| 619 | val = 0; |
| 620 | break; |
| 621 | default: |
| 622 | return false; |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | ret = ((capability & mask) == val); |
| 627 | return ret; |
| 628 | } |
| 629 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 630 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 631 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
| 632 | struct ieee80211_channel *channel, |
| 633 | const u8 *bssid, |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 634 | const u8 *ssid, size_t ssid_len, |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 635 | enum ieee80211_bss_type bss_type, |
| 636 | enum ieee80211_privacy privacy) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 637 | { |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 638 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 639 | struct cfg80211_internal_bss *bss, *res = NULL; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 640 | unsigned long now = jiffies; |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 641 | int bss_privacy; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 642 | |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 643 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
| 644 | privacy); |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 645 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 646 | spin_lock_bh(&rdev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 647 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 648 | list_for_each_entry(bss, &rdev->bss_list, list) { |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 649 | if (!cfg80211_bss_type_match(bss->pub.capability, |
| 650 | bss->pub.channel->band, bss_type)) |
| 651 | continue; |
| 652 | |
| 653 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); |
| 654 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || |
| 655 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 656 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 657 | if (channel && bss->pub.channel != channel) |
| 658 | continue; |
Johannes Berg | c14a740 | 2014-04-09 22:36:50 +0200 | [diff] [blame] | 659 | if (!is_valid_ether_addr(bss->pub.bssid)) |
| 660 | continue; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 661 | /* Don't get expired BSS structs */ |
| 662 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && |
| 663 | !atomic_read(&bss->hold)) |
| 664 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 665 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
| 666 | res = bss; |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 667 | bss_ref_get(rdev, res); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 668 | break; |
| 669 | } |
| 670 | } |
| 671 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 672 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 673 | if (!res) |
| 674 | return NULL; |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 675 | trace_cfg80211_return_bss(&res->pub); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 676 | return &res->pub; |
| 677 | } |
| 678 | EXPORT_SYMBOL(cfg80211_get_bss); |
| 679 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 680 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 681 | struct cfg80211_internal_bss *bss) |
| 682 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 683 | struct rb_node **p = &rdev->bss_tree.rb_node; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 684 | struct rb_node *parent = NULL; |
| 685 | struct cfg80211_internal_bss *tbss; |
| 686 | int cmp; |
| 687 | |
| 688 | while (*p) { |
| 689 | parent = *p; |
| 690 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); |
| 691 | |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 692 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 693 | |
| 694 | if (WARN_ON(!cmp)) { |
| 695 | /* will sort of leak this BSS */ |
| 696 | return; |
| 697 | } |
| 698 | |
| 699 | if (cmp < 0) |
| 700 | p = &(*p)->rb_left; |
| 701 | else |
| 702 | p = &(*p)->rb_right; |
| 703 | } |
| 704 | |
| 705 | rb_link_node(&bss->rbn, parent, p); |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 706 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | static struct cfg80211_internal_bss * |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 710 | rb_find_bss(struct cfg80211_registered_device *rdev, |
Johannes Berg | 5622f5b | 2013-01-30 00:26:45 +0100 | [diff] [blame] | 711 | struct cfg80211_internal_bss *res, |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 712 | enum bss_compare_mode mode) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 713 | { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 714 | struct rb_node *n = rdev->bss_tree.rb_node; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 715 | struct cfg80211_internal_bss *bss; |
| 716 | int r; |
| 717 | |
| 718 | while (n) { |
| 719 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); |
Johannes Berg | 4593c4c | 2013-02-01 19:20:03 +0100 | [diff] [blame] | 720 | r = cmp_bss(&res->pub, &bss->pub, mode); |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 721 | |
| 722 | if (r == 0) |
| 723 | return bss; |
| 724 | else if (r < 0) |
| 725 | n = n->rb_left; |
| 726 | else |
| 727 | n = n->rb_right; |
| 728 | } |
| 729 | |
| 730 | return NULL; |
| 731 | } |
| 732 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 733 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 734 | struct cfg80211_internal_bss *new) |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 735 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 736 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 737 | struct cfg80211_internal_bss *bss; |
| 738 | const u8 *ie; |
| 739 | int i, ssidlen; |
| 740 | u8 fold = 0; |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 741 | u32 n_entries = 0; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 742 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 743 | ies = rcu_access_pointer(new->pub.beacon_ies); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 744 | if (WARN_ON(!ies)) |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 745 | return false; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 746 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 747 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
| 748 | if (!ie) { |
| 749 | /* nothing to do */ |
| 750 | return true; |
| 751 | } |
| 752 | |
| 753 | ssidlen = ie[1]; |
| 754 | for (i = 0; i < ssidlen; i++) |
| 755 | fold |= ie[2 + i]; |
| 756 | |
| 757 | if (fold) { |
| 758 | /* not a hidden SSID */ |
| 759 | return true; |
| 760 | } |
| 761 | |
| 762 | /* This is the bad part ... */ |
| 763 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 764 | list_for_each_entry(bss, &rdev->bss_list, list) { |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 765 | /* |
| 766 | * we're iterating all the entries anyway, so take the |
| 767 | * opportunity to validate the list length accounting |
| 768 | */ |
| 769 | n_entries++; |
| 770 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 771 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
| 772 | continue; |
| 773 | if (bss->pub.channel != new->pub.channel) |
| 774 | continue; |
Simon Wunderlich | dcd6eac | 2013-07-08 16:55:49 +0200 | [diff] [blame] | 775 | if (bss->pub.scan_width != new->pub.scan_width) |
| 776 | continue; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 777 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
| 778 | continue; |
| 779 | ies = rcu_access_pointer(bss->pub.ies); |
| 780 | if (!ies) |
| 781 | continue; |
| 782 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
| 783 | if (!ie) |
| 784 | continue; |
| 785 | if (ssidlen && ie[1] != ssidlen) |
| 786 | continue; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 787 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
| 788 | continue; |
| 789 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) |
| 790 | list_del(&bss->hidden_list); |
| 791 | /* combine them */ |
| 792 | list_add(&bss->hidden_list, &new->hidden_list); |
| 793 | bss->pub.hidden_beacon_bss = &new->pub; |
| 794 | new->refcount += bss->refcount; |
| 795 | rcu_assign_pointer(bss->pub.beacon_ies, |
| 796 | new->pub.beacon_ies); |
| 797 | } |
| 798 | |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 799 | WARN_ONCE(n_entries != rdev->bss_entries, |
| 800 | "rdev bss entries[%d]/list[len:%d] corruption\n", |
| 801 | rdev->bss_entries, n_entries); |
| 802 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 803 | return true; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 804 | } |
| 805 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 806 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 807 | static struct cfg80211_internal_bss * |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 808 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 809 | struct cfg80211_internal_bss *tmp, |
| 810 | bool signal_valid) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 811 | { |
| 812 | struct cfg80211_internal_bss *found = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 813 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 814 | if (WARN_ON(!tmp->pub.channel)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 815 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 816 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 817 | tmp->ts = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 818 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 819 | spin_lock_bh(&rdev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 820 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 821 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 822 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 823 | return NULL; |
| 824 | } |
| 825 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 826 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 827 | |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 828 | if (found) { |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 829 | /* Update IEs */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 830 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
| 831 | const struct cfg80211_bss_ies *old; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 832 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 833 | old = rcu_access_pointer(found->pub.proberesp_ies); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 834 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 835 | rcu_assign_pointer(found->pub.proberesp_ies, |
| 836 | tmp->pub.proberesp_ies); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 837 | /* Override possible earlier Beacon frame IEs */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 838 | rcu_assign_pointer(found->pub.ies, |
| 839 | tmp->pub.proberesp_ies); |
| 840 | if (old) |
| 841 | kfree_rcu((struct cfg80211_bss_ies *)old, |
| 842 | rcu_head); |
| 843 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { |
Johannes Berg | 9537f22 | 2013-02-01 01:19:48 +0100 | [diff] [blame] | 844 | const struct cfg80211_bss_ies *old; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 845 | struct cfg80211_internal_bss *bss; |
| 846 | |
| 847 | if (found->pub.hidden_beacon_bss && |
| 848 | !list_empty(&found->hidden_list)) { |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 849 | const struct cfg80211_bss_ies *f; |
| 850 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 851 | /* |
| 852 | * The found BSS struct is one of the probe |
| 853 | * response members of a group, but we're |
| 854 | * receiving a beacon (beacon_ies in the tmp |
| 855 | * bss is used). This can only mean that the |
| 856 | * AP changed its beacon from not having an |
| 857 | * SSID to showing it, which is confusing so |
| 858 | * drop this information. |
| 859 | */ |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 860 | |
| 861 | f = rcu_access_pointer(tmp->pub.beacon_ies); |
| 862 | kfree_rcu((struct cfg80211_bss_ies *)f, |
| 863 | rcu_head); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 864 | goto drop; |
| 865 | } |
Johannes Berg | 915de2f | 2012-11-28 22:39:37 +0100 | [diff] [blame] | 866 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 867 | old = rcu_access_pointer(found->pub.beacon_ies); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 868 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 869 | rcu_assign_pointer(found->pub.beacon_ies, |
| 870 | tmp->pub.beacon_ies); |
Sven Neumann | 01123e2 | 2010-12-09 15:05:24 +0100 | [diff] [blame] | 871 | |
| 872 | /* Override IEs if they were from a beacon before */ |
Johannes Berg | 9537f22 | 2013-02-01 01:19:48 +0100 | [diff] [blame] | 873 | if (old == rcu_access_pointer(found->pub.ies)) |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 874 | rcu_assign_pointer(found->pub.ies, |
| 875 | tmp->pub.beacon_ies); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 876 | |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 877 | /* Assign beacon IEs to all sub entries */ |
| 878 | list_for_each_entry(bss, &found->hidden_list, |
| 879 | hidden_list) { |
| 880 | const struct cfg80211_bss_ies *ies; |
| 881 | |
| 882 | ies = rcu_access_pointer(bss->pub.beacon_ies); |
| 883 | WARN_ON(ies != old); |
| 884 | |
| 885 | rcu_assign_pointer(bss->pub.beacon_ies, |
| 886 | tmp->pub.beacon_ies); |
| 887 | } |
| 888 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 889 | if (old) |
| 890 | kfree_rcu((struct cfg80211_bss_ies *)old, |
| 891 | rcu_head); |
| 892 | } |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 893 | |
| 894 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 895 | /* |
| 896 | * don't update the signal if beacon was heard on |
| 897 | * adjacent channel. |
| 898 | */ |
| 899 | if (signal_valid) |
| 900 | found->pub.signal = tmp->pub.signal; |
Johannes Berg | 1345ee6 | 2013-03-06 10:31:05 +0100 | [diff] [blame] | 901 | found->pub.capability = tmp->pub.capability; |
| 902 | found->ts = tmp->ts; |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 903 | found->ts_boottime = tmp->ts_boottime; |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 904 | found->parent_tsf = tmp->parent_tsf; |
| 905 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 906 | } else { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 907 | struct cfg80211_internal_bss *new; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 908 | struct cfg80211_internal_bss *hidden; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 909 | struct cfg80211_bss_ies *ies; |
Dmitry Tarnyagin | dd9dfb9 | 2011-11-04 17:12:07 +0100 | [diff] [blame] | 910 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 911 | /* |
| 912 | * create a copy -- the "res" variable that is passed in |
| 913 | * is allocated on the stack since it's not needed in the |
| 914 | * more common case of an update |
| 915 | */ |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 916 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 917 | GFP_ATOMIC); |
| 918 | if (!new) { |
| 919 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); |
| 920 | if (ies) |
| 921 | kfree_rcu(ies, rcu_head); |
| 922 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); |
| 923 | if (ies) |
| 924 | kfree_rcu(ies, rcu_head); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 925 | goto drop; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 926 | } |
| 927 | memcpy(new, tmp, sizeof(*new)); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 928 | new->refcount = 1; |
| 929 | INIT_LIST_HEAD(&new->hidden_list); |
| 930 | |
| 931 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 932 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 933 | if (!hidden) |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 934 | hidden = rb_find_bss(rdev, tmp, |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 935 | BSS_CMP_HIDE_NUL); |
| 936 | if (hidden) { |
| 937 | new->pub.hidden_beacon_bss = &hidden->pub; |
| 938 | list_add(&new->hidden_list, |
| 939 | &hidden->hidden_list); |
| 940 | hidden->refcount++; |
| 941 | rcu_assign_pointer(new->pub.beacon_ies, |
| 942 | hidden->pub.beacon_ies); |
| 943 | } |
| 944 | } else { |
| 945 | /* |
| 946 | * Ok so we found a beacon, and don't have an entry. If |
| 947 | * it's a beacon with hidden SSID, we might be in for an |
| 948 | * expensive search for any probe responses that should |
| 949 | * be grouped with this beacon for updates ... |
| 950 | */ |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 951 | if (!cfg80211_combine_bsses(rdev, new)) { |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 952 | kfree(new); |
| 953 | goto drop; |
| 954 | } |
| 955 | } |
| 956 | |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 957 | if (rdev->bss_entries >= bss_entries_limit && |
| 958 | !cfg80211_bss_expire_oldest(rdev)) { |
| 959 | kfree(new); |
| 960 | goto drop; |
| 961 | } |
| 962 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 963 | list_add_tail(&new->list, &rdev->bss_list); |
Johannes Berg | 9853a55 | 2016-11-15 12:05:11 +0100 | [diff] [blame] | 964 | rdev->bss_entries++; |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 965 | rb_insert_bss(rdev, new); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 966 | found = new; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 967 | } |
| 968 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 969 | rdev->bss_generation++; |
| 970 | bss_ref_get(rdev, found); |
| 971 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 972 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 973 | return found; |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 974 | drop: |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 975 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 976 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 977 | } |
| 978 | |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 979 | /* |
| 980 | * Update RX channel information based on the available frame payload |
| 981 | * information. This is mainly for the 2.4 GHz band where frames can be received |
| 982 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set |
| 983 | * element to indicate the current (transmitting) channel, but this might also |
| 984 | * be needed on other bands if RX frequency does not match with the actual |
| 985 | * operating channel of a BSS. |
| 986 | */ |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 987 | static struct ieee80211_channel * |
| 988 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 989 | struct ieee80211_channel *channel, |
| 990 | enum nl80211_bss_scan_width scan_width) |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 991 | { |
| 992 | const u8 *tmp; |
| 993 | u32 freq; |
| 994 | int channel_number = -1; |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 995 | struct ieee80211_channel *alt_channel; |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 996 | |
| 997 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); |
| 998 | if (tmp && tmp[1] == 1) { |
| 999 | channel_number = tmp[2]; |
| 1000 | } else { |
| 1001 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); |
| 1002 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { |
| 1003 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); |
| 1004 | |
| 1005 | channel_number = htop->primary_chan; |
| 1006 | } |
| 1007 | } |
| 1008 | |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1009 | if (channel_number < 0) { |
| 1010 | /* No channel information in frame payload */ |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1011 | return channel; |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1012 | } |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1013 | |
| 1014 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1015 | alt_channel = ieee80211_get_channel(wiphy, freq); |
| 1016 | if (!alt_channel) { |
| 1017 | if (channel->band == NL80211_BAND_2GHZ) { |
| 1018 | /* |
| 1019 | * Better not allow unexpected channels when that could |
| 1020 | * be going beyond the 1-11 range (e.g., discovering |
| 1021 | * BSS on channel 12 when radio is configured for |
| 1022 | * channel 11. |
| 1023 | */ |
| 1024 | return NULL; |
| 1025 | } |
| 1026 | |
| 1027 | /* No match for the payload channel number - ignore it */ |
| 1028 | return channel; |
| 1029 | } |
| 1030 | |
| 1031 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || |
| 1032 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { |
| 1033 | /* |
| 1034 | * Ignore channel number in 5 and 10 MHz channels where there |
| 1035 | * may not be an n:1 or 1:n mapping between frequencies and |
| 1036 | * channel numbers. |
| 1037 | */ |
| 1038 | return channel; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * Use the channel determined through the payload channel number |
| 1043 | * instead of the RX channel reported by the driver. |
| 1044 | */ |
| 1045 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1046 | return NULL; |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1047 | return alt_channel; |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1048 | } |
| 1049 | |
Ben Greear | 0e3a39b | 2013-06-19 14:06:27 -0700 | [diff] [blame] | 1050 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1051 | struct cfg80211_bss * |
| 1052 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
| 1053 | struct cfg80211_inform_bss *data, |
| 1054 | enum cfg80211_bss_frame_type ftype, |
| 1055 | const u8 *bssid, u64 tsf, u16 capability, |
| 1056 | u16 beacon_interval, const u8 *ie, size_t ielen, |
| 1057 | gfp_t gfp) |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1058 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1059 | struct cfg80211_bss_ies *ies; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 1060 | struct ieee80211_channel *channel; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1061 | struct cfg80211_internal_bss tmp = {}, *res; |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 1062 | int bss_type; |
Emmanuel Grumbach | 67af981 | 2014-05-18 10:15:24 +0300 | [diff] [blame] | 1063 | bool signal_valid; |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1064 | |
| 1065 | if (WARN_ON(!wiphy)) |
| 1066 | return NULL; |
| 1067 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 1068 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1069 | (data->signal < 0 || data->signal > 100))) |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1070 | return NULL; |
| 1071 | |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1072 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
| 1073 | data->scan_width); |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1074 | if (!channel) |
| 1075 | return NULL; |
| 1076 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1077 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
| 1078 | tmp.pub.channel = channel; |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1079 | tmp.pub.scan_width = data->scan_width; |
| 1080 | tmp.pub.signal = data->signal; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1081 | tmp.pub.beacon_interval = beacon_interval; |
| 1082 | tmp.pub.capability = capability; |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1083 | tmp.ts_boottime = data->boottime_ns; |
| 1084 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 1085 | /* |
Johannes Berg | 5bc8c1f | 2014-08-12 21:01:28 +0200 | [diff] [blame] | 1086 | * If we do not know here whether the IEs are from a Beacon or Probe |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 1087 | * Response frame, we need to pick one of the options and only use it |
| 1088 | * with the driver that does not provide the full Beacon/Probe Response |
| 1089 | * frame. Use Beacon frame pointer to avoid indicating that this should |
Johannes Berg | 50521aa | 2013-01-30 21:33:19 +0100 | [diff] [blame] | 1090 | * override the IEs pointer should we have received an earlier |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1091 | * indication of Probe Response data. |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 1092 | */ |
Johannes Berg | 0e22708 | 2014-08-12 20:34:30 +0200 | [diff] [blame] | 1093 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1094 | if (!ies) |
| 1095 | return NULL; |
| 1096 | ies->len = ielen; |
Johannes Berg | 8cef2c9 | 2013-02-05 16:54:31 +0100 | [diff] [blame] | 1097 | ies->tsf = tsf; |
Johannes Berg | 0e22708 | 2014-08-12 20:34:30 +0200 | [diff] [blame] | 1098 | ies->from_beacon = false; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1099 | memcpy(ies->data, ie, ielen); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1100 | |
Johannes Berg | 5bc8c1f | 2014-08-12 21:01:28 +0200 | [diff] [blame] | 1101 | switch (ftype) { |
| 1102 | case CFG80211_BSS_FTYPE_BEACON: |
| 1103 | ies->from_beacon = true; |
| 1104 | /* fall through to assign */ |
| 1105 | case CFG80211_BSS_FTYPE_UNKNOWN: |
| 1106 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
| 1107 | break; |
| 1108 | case CFG80211_BSS_FTYPE_PRESP: |
| 1109 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); |
| 1110 | break; |
| 1111 | } |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1112 | rcu_assign_pointer(tmp.pub.ies, ies); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1113 | |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1114 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
Emmanuel Grumbach | 67af981 | 2014-05-18 10:15:24 +0300 | [diff] [blame] | 1115 | wiphy->max_adj_channel_rssi_comp; |
| 1116 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1117 | if (!res) |
| 1118 | return NULL; |
| 1119 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1120 | if (channel->band == NL80211_BAND_60GHZ) { |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 1121 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
| 1122 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || |
| 1123 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) |
| 1124 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 1125 | } else { |
| 1126 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 1127 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 1128 | } |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1129 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 1130 | trace_cfg80211_return_bss(&res->pub); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1131 | /* cfg80211_bss_update gives us a referenced result */ |
| 1132 | return &res->pub; |
| 1133 | } |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1134 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 1135 | |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1136 | /* cfg80211_inform_bss_width_frame helper */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1137 | struct cfg80211_bss * |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1138 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
| 1139 | struct cfg80211_inform_bss *data, |
| 1140 | struct ieee80211_mgmt *mgmt, size_t len, |
| 1141 | gfp_t gfp) |
| 1142 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1143 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1144 | struct cfg80211_internal_bss tmp = {}, *res; |
| 1145 | struct cfg80211_bss_ies *ies; |
Emmanuel Grumbach | 3afc216 | 2014-03-04 16:50:13 +0200 | [diff] [blame] | 1146 | struct ieee80211_channel *channel; |
Emmanuel Grumbach | 67af981 | 2014-05-18 10:15:24 +0300 | [diff] [blame] | 1147 | bool signal_valid; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1148 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
| 1149 | u.probe_resp.variable); |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 1150 | int bss_type; |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 1151 | |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1152 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
| 1153 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); |
| 1154 | |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1155 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 1156 | |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 1157 | if (WARN_ON(!mgmt)) |
| 1158 | return NULL; |
| 1159 | |
| 1160 | if (WARN_ON(!wiphy)) |
| 1161 | return NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1162 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 1163 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1164 | (data->signal < 0 || data->signal > 100))) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1165 | return NULL; |
| 1166 | |
Mariusz Kozlowski | bef9bac | 2011-03-26 19:26:55 +0100 | [diff] [blame] | 1167 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1168 | return NULL; |
| 1169 | |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1170 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
Jouni Malinen | 48741ca | 2018-09-05 18:52:22 +0300 | [diff] [blame] | 1171 | ielen, data->chan, data->scan_width); |
Johannes Berg | 0172bb7 | 2012-11-23 14:23:30 +0100 | [diff] [blame] | 1172 | if (!channel) |
| 1173 | return NULL; |
| 1174 | |
Johannes Berg | 0e22708 | 2014-08-12 20:34:30 +0200 | [diff] [blame] | 1175 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1176 | if (!ies) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1177 | return NULL; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1178 | ies->len = ielen; |
Johannes Berg | 8cef2c9 | 2013-02-05 16:54:31 +0100 | [diff] [blame] | 1179 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
Johannes Berg | 0e22708 | 2014-08-12 20:34:30 +0200 | [diff] [blame] | 1180 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1181 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1182 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1183 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
| 1184 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); |
| 1185 | else |
| 1186 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
| 1187 | rcu_assign_pointer(tmp.pub.ies, ies); |
| 1188 | |
| 1189 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
| 1190 | tmp.pub.channel = channel; |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1191 | tmp.pub.scan_width = data->scan_width; |
| 1192 | tmp.pub.signal = data->signal; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1193 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
| 1194 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1195 | tmp.ts_boottime = data->boottime_ns; |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 1196 | tmp.parent_tsf = data->parent_tsf; |
| 1197 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1198 | |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1199 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
Emmanuel Grumbach | 67af981 | 2014-05-18 10:15:24 +0300 | [diff] [blame] | 1200 | wiphy->max_adj_channel_rssi_comp; |
| 1201 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1202 | if (!res) |
| 1203 | return NULL; |
| 1204 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1205 | if (channel->band == NL80211_BAND_60GHZ) { |
Dedy Lansky | 6eb1813 | 2015-02-08 15:52:03 +0200 | [diff] [blame] | 1206 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
| 1207 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || |
| 1208 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) |
| 1209 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 1210 | } else { |
| 1211 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 1212 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 1213 | } |
Luis R. Rodriguez | e38f8a7 | 2009-02-21 00:20:39 -0500 | [diff] [blame] | 1214 | |
Beni Lev | 4ee3e06 | 2012-08-27 12:49:39 +0300 | [diff] [blame] | 1215 | trace_cfg80211_return_bss(&res->pub); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1216 | /* cfg80211_bss_update gives us a referenced result */ |
| 1217 | return &res->pub; |
| 1218 | } |
Dmitry Shmidt | 6e19bc4 | 2015-10-07 11:32:53 +0200 | [diff] [blame] | 1219 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1220 | |
Johannes Berg | 5b112d3 | 2013-02-01 01:49:58 +0100 | [diff] [blame] | 1221 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1222 | { |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 1223 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1224 | struct cfg80211_internal_bss *bss; |
| 1225 | |
| 1226 | if (!pub) |
| 1227 | return; |
| 1228 | |
| 1229 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1230 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1231 | spin_lock_bh(&rdev->bss_lock); |
| 1232 | bss_ref_get(rdev, bss); |
| 1233 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 4c0c0b7 | 2012-01-20 13:55:26 +0100 | [diff] [blame] | 1234 | } |
| 1235 | EXPORT_SYMBOL(cfg80211_ref_bss); |
| 1236 | |
Johannes Berg | 5b112d3 | 2013-02-01 01:49:58 +0100 | [diff] [blame] | 1237 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1238 | { |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 1239 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1240 | struct cfg80211_internal_bss *bss; |
| 1241 | |
| 1242 | if (!pub) |
| 1243 | return; |
| 1244 | |
| 1245 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
Johannes Berg | 776b358 | 2013-02-01 02:06:18 +0100 | [diff] [blame] | 1246 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1247 | spin_lock_bh(&rdev->bss_lock); |
| 1248 | bss_ref_put(rdev, bss); |
| 1249 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1250 | } |
| 1251 | EXPORT_SYMBOL(cfg80211_put_bss); |
| 1252 | |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1253 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
| 1254 | { |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 1255 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1256 | struct cfg80211_internal_bss *bss; |
| 1257 | |
| 1258 | if (WARN_ON(!pub)) |
| 1259 | return; |
| 1260 | |
| 1261 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 1262 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1263 | spin_lock_bh(&rdev->bss_lock); |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 1264 | if (!list_empty(&bss->list)) { |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1265 | if (__cfg80211_unlink_bss(rdev, bss)) |
| 1266 | rdev->bss_generation++; |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 1267 | } |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1268 | spin_unlock_bh(&rdev->bss_lock); |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 1269 | } |
| 1270 | EXPORT_SYMBOL(cfg80211_unlink_bss); |
| 1271 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 1272 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1273 | static struct cfg80211_registered_device * |
| 1274 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) |
| 1275 | { |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1276 | struct cfg80211_registered_device *rdev; |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1277 | struct net_device *dev; |
| 1278 | |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1279 | ASSERT_RTNL(); |
| 1280 | |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1281 | dev = dev_get_by_index(net, ifindex); |
| 1282 | if (!dev) |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1283 | return ERR_PTR(-ENODEV); |
| 1284 | if (dev->ieee80211_ptr) |
Zhao, Gang | f26cbf4 | 2014-04-21 12:53:03 +0800 | [diff] [blame] | 1285 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1286 | else |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1287 | rdev = ERR_PTR(-ENODEV); |
| 1288 | dev_put(dev); |
Johannes Berg | 9f419f3 | 2013-05-08 21:34:22 +0200 | [diff] [blame] | 1289 | return rdev; |
| 1290 | } |
| 1291 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1292 | int cfg80211_wext_siwscan(struct net_device *dev, |
| 1293 | struct iw_request_info *info, |
| 1294 | union iwreq_data *wrqu, char *extra) |
| 1295 | { |
| 1296 | struct cfg80211_registered_device *rdev; |
| 1297 | struct wiphy *wiphy; |
| 1298 | struct iw_scan_req *wreq = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1299 | struct cfg80211_scan_request *creq = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1300 | int i, err, n_channels = 0; |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1301 | enum nl80211_band band; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1302 | |
| 1303 | if (!netif_running(dev)) |
| 1304 | return -ENETDOWN; |
| 1305 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1306 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
| 1307 | wreq = (struct iw_scan_req *)extra; |
| 1308 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1309 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1310 | |
| 1311 | if (IS_ERR(rdev)) |
| 1312 | return PTR_ERR(rdev); |
| 1313 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 1314 | if (rdev->scan_req || rdev->scan_msg) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1315 | err = -EBUSY; |
| 1316 | goto out; |
| 1317 | } |
| 1318 | |
| 1319 | wiphy = &rdev->wiphy; |
| 1320 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1321 | /* Determine number of channels, needed to allocate creq */ |
| 1322 | if (wreq && wreq->num_channels) |
| 1323 | n_channels = wreq->num_channels; |
Ilan Peer | bdfbec2 | 2014-01-09 11:37:23 +0200 | [diff] [blame] | 1324 | else |
| 1325 | n_channels = ieee80211_get_num_supported_channels(wiphy); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1326 | |
| 1327 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + |
| 1328 | n_channels * sizeof(void *), |
| 1329 | GFP_ATOMIC); |
| 1330 | if (!creq) { |
| 1331 | err = -ENOMEM; |
| 1332 | goto out; |
| 1333 | } |
| 1334 | |
| 1335 | creq->wiphy = wiphy; |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 1336 | creq->wdev = dev->ieee80211_ptr; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 1337 | /* SSIDs come after channels */ |
| 1338 | creq->ssids = (void *)&creq->channels[n_channels]; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1339 | creq->n_channels = n_channels; |
| 1340 | creq->n_ssids = 1; |
Sam Leffler | 15d6030 | 2012-10-11 21:03:34 -0700 | [diff] [blame] | 1341 | creq->scan_start = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1342 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1343 | /* translate "Scan on frequencies" request */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1344 | i = 0; |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1345 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1346 | int j; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1347 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1348 | if (!wiphy->bands[band]) |
| 1349 | continue; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1350 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1351 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 1352 | /* ignore disabled channels */ |
| 1353 | if (wiphy->bands[band]->channels[j].flags & |
| 1354 | IEEE80211_CHAN_DISABLED) |
| 1355 | continue; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1356 | |
| 1357 | /* If we have a wireless request structure and the |
| 1358 | * wireless request specifies frequencies, then search |
| 1359 | * for the matching hardware channel. |
| 1360 | */ |
| 1361 | if (wreq && wreq->num_channels) { |
| 1362 | int k; |
| 1363 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; |
| 1364 | for (k = 0; k < wreq->num_channels; k++) { |
Zhao, Gang | 96998e3 | 2014-04-09 09:28:06 +0800 | [diff] [blame] | 1365 | struct iw_freq *freq = |
| 1366 | &wreq->channel_list[k]; |
| 1367 | int wext_freq = |
| 1368 | cfg80211_wext_freq(freq); |
| 1369 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1370 | if (wext_freq == wiphy_freq) |
| 1371 | goto wext_freq_found; |
| 1372 | } |
| 1373 | goto wext_freq_not_found; |
| 1374 | } |
| 1375 | |
| 1376 | wext_freq_found: |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1377 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
| 1378 | i++; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1379 | wext_freq_not_found: ; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1380 | } |
| 1381 | } |
Holger Schurig | 8862dc5 | 2009-09-11 10:13:55 +0200 | [diff] [blame] | 1382 | /* No channels found? */ |
| 1383 | if (!i) { |
| 1384 | err = -EINVAL; |
| 1385 | goto out; |
| 1386 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1387 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1388 | /* Set real number of channels specified in creq->channels[] */ |
| 1389 | creq->n_channels = i; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1390 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 1391 | /* translate "Scan for SSID" request */ |
| 1392 | if (wreq) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1393 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1394 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
| 1395 | err = -EINVAL; |
| 1396 | goto out; |
| 1397 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1398 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
| 1399 | creq->ssids[0].ssid_len = wreq->essid_len; |
| 1400 | } |
| 1401 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) |
| 1402 | creq->n_ssids = 0; |
| 1403 | } |
| 1404 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1405 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
Johannes Berg | a401d2b | 2011-07-20 00:52:16 +0200 | [diff] [blame] | 1406 | if (wiphy->bands[i]) |
| 1407 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; |
Johannes Berg | 34850ab | 2011-07-18 18:08:35 +0200 | [diff] [blame] | 1408 | |
Jouni Malinen | 818965d | 2016-02-26 22:12:47 +0200 | [diff] [blame] | 1409 | eth_broadcast_addr(creq->bssid); |
| 1410 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1411 | rdev->scan_req = creq; |
Hila Gonen | e35e4d2 | 2012-06-27 17:19:42 +0300 | [diff] [blame] | 1412 | err = rdev_scan(rdev, creq); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1413 | if (err) { |
| 1414 | rdev->scan_req = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1415 | /* creq will be freed below */ |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1416 | } else { |
Johannes Berg | fd01428 | 2012-06-18 19:17:03 +0200 | [diff] [blame] | 1417 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1418 | /* creq now owned by driver */ |
| 1419 | creq = NULL; |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1420 | dev_hold(dev); |
| 1421 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1422 | out: |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 1423 | kfree(creq); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1424 | return err; |
| 1425 | } |
Johannes Berg | 2afe38d | 2015-01-06 14:00:53 +0100 | [diff] [blame] | 1426 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1427 | |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1428 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
| 1429 | const struct cfg80211_bss_ies *ies, |
| 1430 | char *current_ev, char *end_buf) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1431 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1432 | const u8 *pos, *end, *next; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1433 | struct iw_event iwe; |
| 1434 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1435 | if (!ies) |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1436 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1437 | |
| 1438 | /* |
| 1439 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
| 1440 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
| 1441 | */ |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1442 | pos = ies->data; |
| 1443 | end = pos + ies->len; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1444 | |
| 1445 | while (end - pos > IW_GENERIC_IE_MAX) { |
| 1446 | next = pos + 2 + pos[1]; |
| 1447 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
| 1448 | next = next + 2 + next[1]; |
| 1449 | |
| 1450 | memset(&iwe, 0, sizeof(iwe)); |
| 1451 | iwe.cmd = IWEVGENIE; |
| 1452 | iwe.u.data.length = next - pos; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1453 | current_ev = iwe_stream_add_point_check(info, current_ev, |
| 1454 | end_buf, &iwe, |
| 1455 | (void *)pos); |
| 1456 | if (IS_ERR(current_ev)) |
| 1457 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1458 | pos = next; |
| 1459 | } |
| 1460 | |
| 1461 | if (end > pos) { |
| 1462 | memset(&iwe, 0, sizeof(iwe)); |
| 1463 | iwe.cmd = IWEVGENIE; |
| 1464 | iwe.u.data.length = end - pos; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1465 | current_ev = iwe_stream_add_point_check(info, current_ev, |
| 1466 | end_buf, &iwe, |
| 1467 | (void *)pos); |
| 1468 | if (IS_ERR(current_ev)) |
| 1469 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1470 | } |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1471 | |
| 1472 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1473 | } |
| 1474 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1475 | static char * |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1476 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
| 1477 | struct cfg80211_internal_bss *bss, char *current_ev, |
| 1478 | char *end_buf) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1479 | { |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1480 | const struct cfg80211_bss_ies *ies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1481 | struct iw_event iwe; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1482 | const u8 *ie; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1483 | u8 buf[50]; |
| 1484 | u8 *cfg, *p, *tmp; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1485 | int rem, i, sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1486 | bool ismesh = false; |
| 1487 | |
| 1488 | memset(&iwe, 0, sizeof(iwe)); |
| 1489 | iwe.cmd = SIOCGIWAP; |
| 1490 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
| 1491 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1492 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
| 1493 | IW_EV_ADDR_LEN); |
| 1494 | if (IS_ERR(current_ev)) |
| 1495 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1496 | |
| 1497 | memset(&iwe, 0, sizeof(iwe)); |
| 1498 | iwe.cmd = SIOCGIWFREQ; |
| 1499 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); |
| 1500 | iwe.u.freq.e = 0; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1501 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
| 1502 | IW_EV_FREQ_LEN); |
| 1503 | if (IS_ERR(current_ev)) |
| 1504 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1505 | |
| 1506 | memset(&iwe, 0, sizeof(iwe)); |
| 1507 | iwe.cmd = SIOCGIWFREQ; |
| 1508 | iwe.u.freq.m = bss->pub.channel->center_freq; |
| 1509 | iwe.u.freq.e = 6; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1510 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
| 1511 | IW_EV_FREQ_LEN); |
| 1512 | if (IS_ERR(current_ev)) |
| 1513 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1514 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1515 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1516 | memset(&iwe, 0, sizeof(iwe)); |
| 1517 | iwe.cmd = IWEVQUAL; |
| 1518 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | |
| 1519 | IW_QUAL_NOISE_INVALID | |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1520 | IW_QUAL_QUAL_UPDATED; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1521 | switch (wiphy->signal_type) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1522 | case CFG80211_SIGNAL_TYPE_MBM: |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1523 | sig = bss->pub.signal / 100; |
| 1524 | iwe.u.qual.level = sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1525 | iwe.u.qual.updated |= IW_QUAL_DBM; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1526 | if (sig < -110) /* rather bad */ |
| 1527 | sig = -110; |
| 1528 | else if (sig > -40) /* perfect */ |
| 1529 | sig = -40; |
| 1530 | /* will give a range of 0 .. 70 */ |
| 1531 | iwe.u.qual.qual = sig + 110; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1532 | break; |
| 1533 | case CFG80211_SIGNAL_TYPE_UNSPEC: |
| 1534 | iwe.u.qual.level = bss->pub.signal; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 1535 | /* will give range 0 .. 100 */ |
| 1536 | iwe.u.qual.qual = bss->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1537 | break; |
| 1538 | default: |
| 1539 | /* not reached */ |
| 1540 | break; |
| 1541 | } |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1542 | current_ev = iwe_stream_add_event_check(info, current_ev, |
| 1543 | end_buf, &iwe, |
| 1544 | IW_EV_QUAL_LEN); |
| 1545 | if (IS_ERR(current_ev)) |
| 1546 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | memset(&iwe, 0, sizeof(iwe)); |
| 1550 | iwe.cmd = SIOCGIWENCODE; |
| 1551 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) |
| 1552 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
| 1553 | else |
| 1554 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
| 1555 | iwe.u.data.length = 0; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1556 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
| 1557 | &iwe, ""); |
| 1558 | if (IS_ERR(current_ev)) |
| 1559 | return current_ev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1560 | |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1561 | rcu_read_lock(); |
| 1562 | ies = rcu_dereference(bss->pub.ies); |
Johannes Berg | 83c7aa1 | 2013-02-05 16:51:29 +0100 | [diff] [blame] | 1563 | rem = ies->len; |
| 1564 | ie = ies->data; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1565 | |
Johannes Berg | 83c7aa1 | 2013-02-05 16:51:29 +0100 | [diff] [blame] | 1566 | while (rem >= 2) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1567 | /* invalid data */ |
| 1568 | if (ie[1] > rem - 2) |
| 1569 | break; |
| 1570 | |
| 1571 | switch (ie[0]) { |
| 1572 | case WLAN_EID_SSID: |
| 1573 | memset(&iwe, 0, sizeof(iwe)); |
| 1574 | iwe.cmd = SIOCGIWESSID; |
| 1575 | iwe.u.data.length = ie[1]; |
| 1576 | iwe.u.data.flags = 1; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1577 | current_ev = iwe_stream_add_point_check(info, |
| 1578 | current_ev, |
| 1579 | end_buf, &iwe, |
| 1580 | (u8 *)ie + 2); |
| 1581 | if (IS_ERR(current_ev)) |
| 1582 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1583 | break; |
| 1584 | case WLAN_EID_MESH_ID: |
| 1585 | memset(&iwe, 0, sizeof(iwe)); |
| 1586 | iwe.cmd = SIOCGIWESSID; |
| 1587 | iwe.u.data.length = ie[1]; |
| 1588 | iwe.u.data.flags = 1; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1589 | current_ev = iwe_stream_add_point_check(info, |
| 1590 | current_ev, |
| 1591 | end_buf, &iwe, |
| 1592 | (u8 *)ie + 2); |
| 1593 | if (IS_ERR(current_ev)) |
| 1594 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1595 | break; |
| 1596 | case WLAN_EID_MESH_CONFIG: |
| 1597 | ismesh = true; |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 1598 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1599 | break; |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1600 | cfg = (u8 *)ie + 2; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1601 | memset(&iwe, 0, sizeof(iwe)); |
| 1602 | iwe.cmd = IWEVCUSTOM; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1603 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
| 1604 | "0x%02X", cfg[0]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1605 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1606 | current_ev = iwe_stream_add_point_check(info, |
| 1607 | current_ev, |
| 1608 | end_buf, |
| 1609 | &iwe, buf); |
| 1610 | if (IS_ERR(current_ev)) |
| 1611 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1612 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
| 1613 | cfg[1]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1614 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1615 | current_ev = iwe_stream_add_point_check(info, |
| 1616 | current_ev, |
| 1617 | end_buf, |
| 1618 | &iwe, buf); |
| 1619 | if (IS_ERR(current_ev)) |
| 1620 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1621 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
| 1622 | cfg[2]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1623 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1624 | current_ev = iwe_stream_add_point_check(info, |
| 1625 | current_ev, |
| 1626 | end_buf, |
| 1627 | &iwe, buf); |
| 1628 | if (IS_ERR(current_ev)) |
| 1629 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1630 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1631 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1632 | current_ev = iwe_stream_add_point_check(info, |
| 1633 | current_ev, |
| 1634 | end_buf, |
| 1635 | &iwe, buf); |
| 1636 | if (IS_ERR(current_ev)) |
| 1637 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1638 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
| 1639 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1640 | current_ev = iwe_stream_add_point_check(info, |
| 1641 | current_ev, |
| 1642 | end_buf, |
| 1643 | &iwe, buf); |
| 1644 | if (IS_ERR(current_ev)) |
| 1645 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1646 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
| 1647 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1648 | current_ev = iwe_stream_add_point_check(info, |
| 1649 | current_ev, |
| 1650 | end_buf, |
| 1651 | &iwe, buf); |
| 1652 | if (IS_ERR(current_ev)) |
| 1653 | goto unlock; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 1654 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1655 | iwe.u.data.length = strlen(buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1656 | current_ev = iwe_stream_add_point_check(info, |
| 1657 | current_ev, |
| 1658 | end_buf, |
| 1659 | &iwe, buf); |
| 1660 | if (IS_ERR(current_ev)) |
| 1661 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1662 | break; |
| 1663 | case WLAN_EID_SUPP_RATES: |
| 1664 | case WLAN_EID_EXT_SUPP_RATES: |
| 1665 | /* display all supported rates in readable format */ |
| 1666 | p = current_ev + iwe_stream_lcp_len(info); |
| 1667 | |
| 1668 | memset(&iwe, 0, sizeof(iwe)); |
| 1669 | iwe.cmd = SIOCGIWRATE; |
| 1670 | /* Those two flags are ignored... */ |
| 1671 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
| 1672 | |
| 1673 | for (i = 0; i < ie[1]; i++) { |
| 1674 | iwe.u.bitrate.value = |
| 1675 | ((ie[i + 2] & 0x7f) * 500000); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1676 | tmp = p; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1677 | p = iwe_stream_add_value(info, current_ev, p, |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1678 | end_buf, &iwe, |
| 1679 | IW_EV_PARAM_LEN); |
| 1680 | if (p == tmp) { |
| 1681 | current_ev = ERR_PTR(-E2BIG); |
| 1682 | goto unlock; |
| 1683 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1684 | } |
| 1685 | current_ev = p; |
| 1686 | break; |
| 1687 | } |
| 1688 | rem -= ie[1] + 2; |
| 1689 | ie += ie[1] + 2; |
| 1690 | } |
| 1691 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1692 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
| 1693 | ismesh) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1694 | memset(&iwe, 0, sizeof(iwe)); |
| 1695 | iwe.cmd = SIOCGIWMODE; |
| 1696 | if (ismesh) |
| 1697 | iwe.u.mode = IW_MODE_MESH; |
| 1698 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) |
| 1699 | iwe.u.mode = IW_MODE_MASTER; |
| 1700 | else |
| 1701 | iwe.u.mode = IW_MODE_ADHOC; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1702 | current_ev = iwe_stream_add_event_check(info, current_ev, |
| 1703 | end_buf, &iwe, |
| 1704 | IW_EV_UINT_LEN); |
| 1705 | if (IS_ERR(current_ev)) |
| 1706 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1707 | } |
| 1708 | |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1709 | memset(&iwe, 0, sizeof(iwe)); |
| 1710 | iwe.cmd = IWEVCUSTOM; |
| 1711 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); |
| 1712 | iwe.u.data.length = strlen(buf); |
| 1713 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
| 1714 | &iwe, buf); |
| 1715 | if (IS_ERR(current_ev)) |
| 1716 | goto unlock; |
| 1717 | memset(&iwe, 0, sizeof(iwe)); |
| 1718 | iwe.cmd = IWEVCUSTOM; |
| 1719 | sprintf(buf, " Last beacon: %ums ago", |
| 1720 | elapsed_jiffies_msecs(bss->ts)); |
| 1721 | iwe.u.data.length = strlen(buf); |
| 1722 | current_ev = iwe_stream_add_point_check(info, current_ev, |
| 1723 | end_buf, &iwe, buf); |
| 1724 | if (IS_ERR(current_ev)) |
| 1725 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1726 | |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1727 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); |
| 1728 | |
| 1729 | unlock: |
Johannes Berg | 9caf036 | 2012-11-29 01:25:20 +0100 | [diff] [blame] | 1730 | rcu_read_unlock(); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1731 | return current_ev; |
| 1732 | } |
| 1733 | |
| 1734 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1735 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1736 | struct iw_request_info *info, |
| 1737 | char *buf, size_t len) |
| 1738 | { |
| 1739 | char *current_ev = buf; |
| 1740 | char *end_buf = buf + len; |
| 1741 | struct cfg80211_internal_bss *bss; |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1742 | int err = 0; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1743 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1744 | spin_lock_bh(&rdev->bss_lock); |
| 1745 | cfg80211_bss_expire(rdev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1746 | |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1747 | list_for_each_entry(bss, &rdev->bss_list, list) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1748 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1749 | err = -E2BIG; |
| 1750 | break; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1751 | } |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1752 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1753 | current_ev, end_buf); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1754 | if (IS_ERR(current_ev)) { |
| 1755 | err = PTR_ERR(current_ev); |
| 1756 | break; |
| 1757 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1758 | } |
Zhao, Gang | 1b8ec87 | 2014-04-21 12:53:02 +0800 | [diff] [blame] | 1759 | spin_unlock_bh(&rdev->bss_lock); |
James Minor | 76a70e9 | 2015-02-24 12:58:20 -0600 | [diff] [blame] | 1760 | |
| 1761 | if (err) |
| 1762 | return err; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1763 | return current_ev - buf; |
| 1764 | } |
| 1765 | |
| 1766 | |
| 1767 | int cfg80211_wext_giwscan(struct net_device *dev, |
| 1768 | struct iw_request_info *info, |
| 1769 | struct iw_point *data, char *extra) |
| 1770 | { |
| 1771 | struct cfg80211_registered_device *rdev; |
| 1772 | int res; |
| 1773 | |
| 1774 | if (!netif_running(dev)) |
| 1775 | return -ENETDOWN; |
| 1776 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1777 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1778 | |
| 1779 | if (IS_ERR(rdev)) |
| 1780 | return PTR_ERR(rdev); |
| 1781 | |
Johannes Berg | f9d15d1 | 2014-01-22 11:14:19 +0200 | [diff] [blame] | 1782 | if (rdev->scan_req || rdev->scan_msg) |
Johannes Berg | 5fe231e | 2013-05-08 21:45:15 +0200 | [diff] [blame] | 1783 | return -EAGAIN; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1784 | |
| 1785 | res = ieee80211_scan_results(rdev, info, extra, data->length); |
| 1786 | data->length = 0; |
| 1787 | if (res >= 0) { |
| 1788 | data->length = res; |
| 1789 | res = 0; |
| 1790 | } |
| 1791 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1792 | return res; |
| 1793 | } |
Johannes Berg | 2afe38d | 2015-01-06 14:00:53 +0100 | [diff] [blame] | 1794 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1795 | #endif |