v4.19.13 snapshot.
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
new file mode 100644
index 0000000..d0e7472
--- /dev/null
+++ b/net/wireless/scan.c
@@ -0,0 +1,1879 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cfg80211 scan result handling
+ *
+ * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright 2016 Intel Deutschland GmbH
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/wireless.h>
+#include <linux/nl80211.h>
+#include <linux/etherdevice.h>
+#include <net/arp.h>
+#include <net/cfg80211.h>
+#include <net/cfg80211-wext.h>
+#include <net/iw_handler.h>
+#include "core.h"
+#include "nl80211.h"
+#include "wext-compat.h"
+#include "rdev-ops.h"
+
+/**
+ * DOC: BSS tree/list structure
+ *
+ * At the top level, the BSS list is kept in both a list in each
+ * registered device (@bss_list) as well as an RB-tree for faster
+ * lookup. In the RB-tree, entries can be looked up using their
+ * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
+ * for other BSSes.
+ *
+ * Due to the possibility of hidden SSIDs, there's a second level
+ * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
+ * The hidden_list connects all BSSes belonging to a single AP
+ * that has a hidden SSID, and connects beacon and probe response
+ * entries. For a probe response entry for a hidden SSID, the
+ * hidden_beacon_bss pointer points to the BSS struct holding the
+ * beacon's information.
+ *
+ * Reference counting is done for all these references except for
+ * the hidden_list, so that a beacon BSS struct that is otherwise
+ * not referenced has one reference for being on the bss_list and
+ * one for each probe response entry that points to it using the
+ * hidden_beacon_bss pointer. When a BSS struct that has such a
+ * pointer is get/put, the refcount update is also propagated to
+ * the referenced struct, this ensure that it cannot get removed
+ * while somebody is using the probe response version.
+ *
+ * Note that the hidden_beacon_bss pointer never changes, due to
+ * the reference counting. Therefore, no locking is needed for
+ * it.
+ *
+ * Also note that the hidden_beacon_bss pointer is only relevant
+ * if the driver uses something other than the IEs, e.g. private
+ * data stored stored in the BSS struct, since the beacon IEs are
+ * also linked into the probe response struct.
+ */
+
+/*
+ * Limit the number of BSS entries stored in mac80211. Each one is
+ * a bit over 4k at most, so this limits to roughly 4-5M of memory.
+ * If somebody wants to really attack this though, they'd likely
+ * use small beacons, and only one type of frame, limiting each of
+ * the entries to a much smaller size (in order to generate more
+ * entries in total, so overhead is bigger.)
+ */
+static int bss_entries_limit = 1000;
+module_param(bss_entries_limit, int, 0644);
+MODULE_PARM_DESC(bss_entries_limit,
+ "limit to number of scan BSS entries (per wiphy, default 1000)");
+
+#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
+
+static void bss_free(struct cfg80211_internal_bss *bss)
+{
+ struct cfg80211_bss_ies *ies;
+
+ if (WARN_ON(atomic_read(&bss->hold)))
+ return;
+
+ ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
+ if (ies && !bss->pub.hidden_beacon_bss)
+ kfree_rcu(ies, rcu_head);
+ ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
+ if (ies)
+ kfree_rcu(ies, rcu_head);
+
+ /*
+ * This happens when the module is removed, it doesn't
+ * really matter any more save for completeness
+ */
+ if (!list_empty(&bss->hidden_list))
+ list_del(&bss->hidden_list);
+
+ kfree(bss);
+}
+
+static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ bss->refcount++;
+ if (bss->pub.hidden_beacon_bss) {
+ bss = container_of(bss->pub.hidden_beacon_bss,
+ struct cfg80211_internal_bss,
+ pub);
+ bss->refcount++;
+ }
+}
+
+static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ if (bss->pub.hidden_beacon_bss) {
+ struct cfg80211_internal_bss *hbss;
+ hbss = container_of(bss->pub.hidden_beacon_bss,
+ struct cfg80211_internal_bss,
+ pub);
+ hbss->refcount--;
+ if (hbss->refcount == 0)
+ bss_free(hbss);
+ }
+ bss->refcount--;
+ if (bss->refcount == 0)
+ bss_free(bss);
+}
+
+static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ if (!list_empty(&bss->hidden_list)) {
+ /*
+ * don't remove the beacon entry if it has
+ * probe responses associated with it
+ */
+ if (!bss->pub.hidden_beacon_bss)
+ return false;
+ /*
+ * if it's a probe response entry break its
+ * link to the other entries in the group
+ */
+ list_del_init(&bss->hidden_list);
+ }
+
+ list_del_init(&bss->list);
+ rb_erase(&bss->rbn, &rdev->bss_tree);
+ rdev->bss_entries--;
+ WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
+ "rdev bss entries[%d]/list[empty:%d] corruption\n",
+ rdev->bss_entries, list_empty(&rdev->bss_list));
+ bss_ref_put(rdev, bss);
+ return true;
+}
+
+static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
+ unsigned long expire_time)
+{
+ struct cfg80211_internal_bss *bss, *tmp;
+ bool expired = false;
+
+ lockdep_assert_held(&rdev->bss_lock);
+
+ list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
+ if (atomic_read(&bss->hold))
+ continue;
+ if (!time_after(expire_time, bss->ts))
+ continue;
+
+ if (__cfg80211_unlink_bss(rdev, bss))
+ expired = true;
+ }
+
+ if (expired)
+ rdev->bss_generation++;
+}
+
+static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
+{
+ struct cfg80211_internal_bss *bss, *oldest = NULL;
+ bool ret;
+
+ lockdep_assert_held(&rdev->bss_lock);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (atomic_read(&bss->hold))
+ continue;
+
+ if (!list_empty(&bss->hidden_list) &&
+ !bss->pub.hidden_beacon_bss)
+ continue;
+
+ if (oldest && time_before(oldest->ts, bss->ts))
+ continue;
+ oldest = bss;
+ }
+
+ if (WARN_ON(!oldest))
+ return false;
+
+ /*
+ * The callers make sure to increase rdev->bss_generation if anything
+ * gets removed (and a new entry added), so there's no need to also do
+ * it here.
+ */
+
+ ret = __cfg80211_unlink_bss(rdev, oldest);
+ WARN_ON(!ret);
+ return ret;
+}
+
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
+ bool send_message)
+{
+ struct cfg80211_scan_request *request;
+ struct wireless_dev *wdev;
+ struct sk_buff *msg;
+#ifdef CONFIG_CFG80211_WEXT
+ union iwreq_data wrqu;
+#endif
+
+ ASSERT_RTNL();
+
+ if (rdev->scan_msg) {
+ nl80211_send_scan_msg(rdev, rdev->scan_msg);
+ rdev->scan_msg = NULL;
+ return;
+ }
+
+ request = rdev->scan_req;
+ if (!request)
+ return;
+
+ wdev = request->wdev;
+
+ /*
+ * This must be before sending the other events!
+ * Otherwise, wpa_supplicant gets completely confused with
+ * wext events.
+ */
+ if (wdev->netdev)
+ cfg80211_sme_scan_done(wdev->netdev);
+
+ if (!request->info.aborted &&
+ request->flags & NL80211_SCAN_FLAG_FLUSH) {
+ /* flush entries from previous scans */
+ spin_lock_bh(&rdev->bss_lock);
+ __cfg80211_bss_expire(rdev, request->scan_start);
+ spin_unlock_bh(&rdev->bss_lock);
+ }
+
+ msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
+
+#ifdef CONFIG_CFG80211_WEXT
+ if (wdev->netdev && !request->info.aborted) {
+ memset(&wrqu, 0, sizeof(wrqu));
+
+ wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
+ }
+#endif
+
+ if (wdev->netdev)
+ dev_put(wdev->netdev);
+
+ rdev->scan_req = NULL;
+ kfree(request);
+
+ if (!send_message)
+ rdev->scan_msg = msg;
+ else
+ nl80211_send_scan_msg(rdev, msg);
+}
+
+void __cfg80211_scan_done(struct work_struct *wk)
+{
+ struct cfg80211_registered_device *rdev;
+
+ rdev = container_of(wk, struct cfg80211_registered_device,
+ scan_done_wk);
+
+ rtnl_lock();
+ ___cfg80211_scan_done(rdev, true);
+ rtnl_unlock();
+}
+
+void cfg80211_scan_done(struct cfg80211_scan_request *request,
+ struct cfg80211_scan_info *info)
+{
+ trace_cfg80211_scan_done(request, info);
+ WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
+
+ request->info = *info;
+ request->notified = true;
+ queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
+}
+EXPORT_SYMBOL(cfg80211_scan_done);
+
+void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req)
+{
+ ASSERT_RTNL();
+
+ list_add_rcu(&req->list, &rdev->sched_scan_req_list);
+}
+
+static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req)
+{
+ ASSERT_RTNL();
+
+ list_del_rcu(&req->list);
+ kfree_rcu(req, rcu_head);
+}
+
+static struct cfg80211_sched_scan_request *
+cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
+{
+ struct cfg80211_sched_scan_request *pos;
+
+ WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
+
+ list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
+ if (pos->reqid == reqid)
+ return pos;
+ }
+ return NULL;
+}
+
+/*
+ * Determines if a scheduled scan request can be handled. When a legacy
+ * scheduled scan is running no other scheduled scan is allowed regardless
+ * whether the request is for legacy or multi-support scan. When a multi-support
+ * scheduled scan is running a request for legacy scan is not allowed. In this
+ * case a request for multi-support scan can be handled if resources are
+ * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
+ */
+int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
+ bool want_multi)
+{
+ struct cfg80211_sched_scan_request *pos;
+ int i = 0;
+
+ list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
+ /* request id zero means legacy in progress */
+ if (!i && !pos->reqid)
+ return -EINPROGRESS;
+ i++;
+ }
+
+ if (i) {
+ /* no legacy allowed when multi request(s) are active */
+ if (!want_multi)
+ return -EINPROGRESS;
+
+ /* resource limit reached */
+ if (i == rdev->wiphy.max_sched_scan_reqs)
+ return -ENOSPC;
+ }
+ return 0;
+}
+
+void cfg80211_sched_scan_results_wk(struct work_struct *work)
+{
+ struct cfg80211_registered_device *rdev;
+ struct cfg80211_sched_scan_request *req, *tmp;
+
+ rdev = container_of(work, struct cfg80211_registered_device,
+ sched_scan_res_wk);
+
+ rtnl_lock();
+ list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
+ if (req->report_results) {
+ req->report_results = false;
+ if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
+ /* flush entries from previous scans */
+ spin_lock_bh(&rdev->bss_lock);
+ __cfg80211_bss_expire(rdev, req->scan_start);
+ spin_unlock_bh(&rdev->bss_lock);
+ req->scan_start = jiffies;
+ }
+ nl80211_send_sched_scan(req,
+ NL80211_CMD_SCHED_SCAN_RESULTS);
+ }
+ }
+ rtnl_unlock();
+}
+
+void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_sched_scan_request *request;
+
+ trace_cfg80211_sched_scan_results(wiphy, reqid);
+ /* ignore if we're not scanning */
+
+ rcu_read_lock();
+ request = cfg80211_find_sched_scan_req(rdev, reqid);
+ if (request) {
+ request->report_results = true;
+ queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_results);
+
+void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+ ASSERT_RTNL();
+
+ trace_cfg80211_sched_scan_stopped(wiphy, reqid);
+
+ __cfg80211_stop_sched_scan(rdev, reqid, true);
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
+
+void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
+{
+ rtnl_lock();
+ cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
+ rtnl_unlock();
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
+
+int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req,
+ bool driver_initiated)
+{
+ ASSERT_RTNL();
+
+ if (!driver_initiated) {
+ int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
+ if (err)
+ return err;
+ }
+
+ nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
+
+ cfg80211_del_sched_scan_req(rdev, req);
+
+ return 0;
+}
+
+int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
+ u64 reqid, bool driver_initiated)
+{
+ struct cfg80211_sched_scan_request *sched_scan_req;
+
+ ASSERT_RTNL();
+
+ sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
+ if (!sched_scan_req)
+ return -ENOENT;
+
+ return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
+ driver_initiated);
+}
+
+void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
+ unsigned long age_secs)
+{
+ struct cfg80211_internal_bss *bss;
+ unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
+
+ spin_lock_bh(&rdev->bss_lock);
+ list_for_each_entry(bss, &rdev->bss_list, list)
+ bss->ts -= age_jiffies;
+ spin_unlock_bh(&rdev->bss_lock);
+}
+
+void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
+{
+ __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
+}
+
+const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len,
+ const u8 *match, int match_len,
+ int match_offset)
+{
+ /* match_offset can't be smaller than 2, unless match_len is
+ * zero, in which case match_offset must be zero as well.
+ */
+ if (WARN_ON((match_len && match_offset < 2) ||
+ (!match_len && match_offset)))
+ return NULL;
+
+ while (len >= 2 && len >= ies[1] + 2) {
+ if ((ies[0] == eid) &&
+ (ies[1] + 2 >= match_offset + match_len) &&
+ !memcmp(ies + match_offset, match, match_len))
+ return ies;
+
+ len -= ies[1] + 2;
+ ies += ies[1] + 2;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(cfg80211_find_ie_match);
+
+const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
+ const u8 *ies, int len)
+{
+ const u8 *ie;
+ u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
+ int match_len = (oui_type < 0) ? 3 : sizeof(match);
+
+ if (WARN_ON(oui_type > 0xff))
+ return NULL;
+
+ ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
+ match, match_len, 2);
+
+ if (ie && (ie[1] < 4))
+ return NULL;
+
+ return ie;
+}
+EXPORT_SYMBOL(cfg80211_find_vendor_ie);
+
+static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
+ const u8 *ssid, size_t ssid_len)
+{
+ const struct cfg80211_bss_ies *ies;
+ const u8 *ssidie;
+
+ if (bssid && !ether_addr_equal(a->bssid, bssid))
+ return false;
+
+ if (!ssid)
+ return true;
+
+ ies = rcu_access_pointer(a->ies);
+ if (!ies)
+ return false;
+ ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+ if (!ssidie)
+ return false;
+ if (ssidie[1] != ssid_len)
+ return false;
+ return memcmp(ssidie + 2, ssid, ssid_len) == 0;
+}
+
+/**
+ * enum bss_compare_mode - BSS compare mode
+ * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
+ * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
+ * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
+ */
+enum bss_compare_mode {
+ BSS_CMP_REGULAR,
+ BSS_CMP_HIDE_ZLEN,
+ BSS_CMP_HIDE_NUL,
+};
+
+static int cmp_bss(struct cfg80211_bss *a,
+ struct cfg80211_bss *b,
+ enum bss_compare_mode mode)
+{
+ const struct cfg80211_bss_ies *a_ies, *b_ies;
+ const u8 *ie1 = NULL;
+ const u8 *ie2 = NULL;
+ int i, r;
+
+ if (a->channel != b->channel)
+ return b->channel->center_freq - a->channel->center_freq;
+
+ a_ies = rcu_access_pointer(a->ies);
+ if (!a_ies)
+ return -1;
+ b_ies = rcu_access_pointer(b->ies);
+ if (!b_ies)
+ return 1;
+
+ if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
+ ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
+ a_ies->data, a_ies->len);
+ if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
+ ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
+ b_ies->data, b_ies->len);
+ if (ie1 && ie2) {
+ int mesh_id_cmp;
+
+ if (ie1[1] == ie2[1])
+ mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+ else
+ mesh_id_cmp = ie2[1] - ie1[1];
+
+ ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+ a_ies->data, a_ies->len);
+ ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+ b_ies->data, b_ies->len);
+ if (ie1 && ie2) {
+ if (mesh_id_cmp)
+ return mesh_id_cmp;
+ if (ie1[1] != ie2[1])
+ return ie2[1] - ie1[1];
+ return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+ }
+ }
+
+ r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
+ if (r)
+ return r;
+
+ ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
+ ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
+
+ if (!ie1 && !ie2)
+ return 0;
+
+ /*
+ * Note that with "hide_ssid", the function returns a match if
+ * the already-present BSS ("b") is a hidden SSID beacon for
+ * the new BSS ("a").
+ */
+
+ /* sort missing IE before (left of) present IE */
+ if (!ie1)
+ return -1;
+ if (!ie2)
+ return 1;
+
+ switch (mode) {
+ case BSS_CMP_HIDE_ZLEN:
+ /*
+ * In ZLEN mode we assume the BSS entry we're
+ * looking for has a zero-length SSID. So if
+ * the one we're looking at right now has that,
+ * return 0. Otherwise, return the difference
+ * in length, but since we're looking for the
+ * 0-length it's really equivalent to returning
+ * the length of the one we're looking at.
+ *
+ * No content comparison is needed as we assume
+ * the content length is zero.
+ */
+ return ie2[1];
+ case BSS_CMP_REGULAR:
+ default:
+ /* sort by length first, then by contents */
+ if (ie1[1] != ie2[1])
+ return ie2[1] - ie1[1];
+ return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+ case BSS_CMP_HIDE_NUL:
+ if (ie1[1] != ie2[1])
+ return ie2[1] - ie1[1];
+ /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
+ for (i = 0; i < ie2[1]; i++)
+ if (ie2[i + 2])
+ return -1;
+ return 0;
+ }
+}
+
+static bool cfg80211_bss_type_match(u16 capability,
+ enum nl80211_band band,
+ enum ieee80211_bss_type bss_type)
+{
+ bool ret = true;
+ u16 mask, val;
+
+ if (bss_type == IEEE80211_BSS_TYPE_ANY)
+ return ret;
+
+ if (band == NL80211_BAND_60GHZ) {
+ mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
+ switch (bss_type) {
+ case IEEE80211_BSS_TYPE_ESS:
+ val = WLAN_CAPABILITY_DMG_TYPE_AP;
+ break;
+ case IEEE80211_BSS_TYPE_PBSS:
+ val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
+ break;
+ case IEEE80211_BSS_TYPE_IBSS:
+ val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
+ break;
+ default:
+ return false;
+ }
+ } else {
+ mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
+ switch (bss_type) {
+ case IEEE80211_BSS_TYPE_ESS:
+ val = WLAN_CAPABILITY_ESS;
+ break;
+ case IEEE80211_BSS_TYPE_IBSS:
+ val = WLAN_CAPABILITY_IBSS;
+ break;
+ case IEEE80211_BSS_TYPE_MBSS:
+ val = 0;
+ break;
+ default:
+ return false;
+ }
+ }
+
+ ret = ((capability & mask) == val);
+ return ret;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
+ struct ieee80211_channel *channel,
+ const u8 *bssid,
+ const u8 *ssid, size_t ssid_len,
+ enum ieee80211_bss_type bss_type,
+ enum ieee80211_privacy privacy)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *bss, *res = NULL;
+ unsigned long now = jiffies;
+ int bss_privacy;
+
+ trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
+ privacy);
+
+ spin_lock_bh(&rdev->bss_lock);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (!cfg80211_bss_type_match(bss->pub.capability,
+ bss->pub.channel->band, bss_type))
+ continue;
+
+ bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
+ if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
+ (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
+ continue;
+ if (channel && bss->pub.channel != channel)
+ continue;
+ if (!is_valid_ether_addr(bss->pub.bssid))
+ continue;
+ /* Don't get expired BSS structs */
+ if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
+ !atomic_read(&bss->hold))
+ continue;
+ if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
+ res = bss;
+ bss_ref_get(rdev, res);
+ break;
+ }
+ }
+
+ spin_unlock_bh(&rdev->bss_lock);
+ if (!res)
+ return NULL;
+ trace_cfg80211_return_bss(&res->pub);
+ return &res->pub;
+}
+EXPORT_SYMBOL(cfg80211_get_bss);
+
+static void rb_insert_bss(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ struct rb_node **p = &rdev->bss_tree.rb_node;
+ struct rb_node *parent = NULL;
+ struct cfg80211_internal_bss *tbss;
+ int cmp;
+
+ while (*p) {
+ parent = *p;
+ tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
+
+ cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
+
+ if (WARN_ON(!cmp)) {
+ /* will sort of leak this BSS */
+ return;
+ }
+
+ if (cmp < 0)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&bss->rbn, parent, p);
+ rb_insert_color(&bss->rbn, &rdev->bss_tree);
+}
+
+static struct cfg80211_internal_bss *
+rb_find_bss(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *res,
+ enum bss_compare_mode mode)
+{
+ struct rb_node *n = rdev->bss_tree.rb_node;
+ struct cfg80211_internal_bss *bss;
+ int r;
+
+ while (n) {
+ bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
+ r = cmp_bss(&res->pub, &bss->pub, mode);
+
+ if (r == 0)
+ return bss;
+ else if (r < 0)
+ n = n->rb_left;
+ else
+ n = n->rb_right;
+ }
+
+ return NULL;
+}
+
+static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *new)
+{
+ const struct cfg80211_bss_ies *ies;
+ struct cfg80211_internal_bss *bss;
+ const u8 *ie;
+ int i, ssidlen;
+ u8 fold = 0;
+ u32 n_entries = 0;
+
+ ies = rcu_access_pointer(new->pub.beacon_ies);
+ if (WARN_ON(!ies))
+ return false;
+
+ ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+ if (!ie) {
+ /* nothing to do */
+ return true;
+ }
+
+ ssidlen = ie[1];
+ for (i = 0; i < ssidlen; i++)
+ fold |= ie[2 + i];
+
+ if (fold) {
+ /* not a hidden SSID */
+ return true;
+ }
+
+ /* This is the bad part ... */
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ /*
+ * we're iterating all the entries anyway, so take the
+ * opportunity to validate the list length accounting
+ */
+ n_entries++;
+
+ if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
+ continue;
+ if (bss->pub.channel != new->pub.channel)
+ continue;
+ if (bss->pub.scan_width != new->pub.scan_width)
+ continue;
+ if (rcu_access_pointer(bss->pub.beacon_ies))
+ continue;
+ ies = rcu_access_pointer(bss->pub.ies);
+ if (!ies)
+ continue;
+ ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+ if (!ie)
+ continue;
+ if (ssidlen && ie[1] != ssidlen)
+ continue;
+ if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
+ continue;
+ if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
+ list_del(&bss->hidden_list);
+ /* combine them */
+ list_add(&bss->hidden_list, &new->hidden_list);
+ bss->pub.hidden_beacon_bss = &new->pub;
+ new->refcount += bss->refcount;
+ rcu_assign_pointer(bss->pub.beacon_ies,
+ new->pub.beacon_ies);
+ }
+
+ WARN_ONCE(n_entries != rdev->bss_entries,
+ "rdev bss entries[%d]/list[len:%d] corruption\n",
+ rdev->bss_entries, n_entries);
+
+ return true;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+static struct cfg80211_internal_bss *
+cfg80211_bss_update(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *tmp,
+ bool signal_valid)
+{
+ struct cfg80211_internal_bss *found = NULL;
+
+ if (WARN_ON(!tmp->pub.channel))
+ return NULL;
+
+ tmp->ts = jiffies;
+
+ spin_lock_bh(&rdev->bss_lock);
+
+ if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
+ spin_unlock_bh(&rdev->bss_lock);
+ return NULL;
+ }
+
+ found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
+
+ if (found) {
+ /* Update IEs */
+ if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
+ const struct cfg80211_bss_ies *old;
+
+ old = rcu_access_pointer(found->pub.proberesp_ies);
+
+ rcu_assign_pointer(found->pub.proberesp_ies,
+ tmp->pub.proberesp_ies);
+ /* Override possible earlier Beacon frame IEs */
+ rcu_assign_pointer(found->pub.ies,
+ tmp->pub.proberesp_ies);
+ if (old)
+ kfree_rcu((struct cfg80211_bss_ies *)old,
+ rcu_head);
+ } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
+ const struct cfg80211_bss_ies *old;
+ struct cfg80211_internal_bss *bss;
+
+ if (found->pub.hidden_beacon_bss &&
+ !list_empty(&found->hidden_list)) {
+ const struct cfg80211_bss_ies *f;
+
+ /*
+ * The found BSS struct is one of the probe
+ * response members of a group, but we're
+ * receiving a beacon (beacon_ies in the tmp
+ * bss is used). This can only mean that the
+ * AP changed its beacon from not having an
+ * SSID to showing it, which is confusing so
+ * drop this information.
+ */
+
+ f = rcu_access_pointer(tmp->pub.beacon_ies);
+ kfree_rcu((struct cfg80211_bss_ies *)f,
+ rcu_head);
+ goto drop;
+ }
+
+ old = rcu_access_pointer(found->pub.beacon_ies);
+
+ rcu_assign_pointer(found->pub.beacon_ies,
+ tmp->pub.beacon_ies);
+
+ /* Override IEs if they were from a beacon before */
+ if (old == rcu_access_pointer(found->pub.ies))
+ rcu_assign_pointer(found->pub.ies,
+ tmp->pub.beacon_ies);
+
+ /* Assign beacon IEs to all sub entries */
+ list_for_each_entry(bss, &found->hidden_list,
+ hidden_list) {
+ const struct cfg80211_bss_ies *ies;
+
+ ies = rcu_access_pointer(bss->pub.beacon_ies);
+ WARN_ON(ies != old);
+
+ rcu_assign_pointer(bss->pub.beacon_ies,
+ tmp->pub.beacon_ies);
+ }
+
+ if (old)
+ kfree_rcu((struct cfg80211_bss_ies *)old,
+ rcu_head);
+ }
+
+ found->pub.beacon_interval = tmp->pub.beacon_interval;
+ /*
+ * don't update the signal if beacon was heard on
+ * adjacent channel.
+ */
+ if (signal_valid)
+ found->pub.signal = tmp->pub.signal;
+ found->pub.capability = tmp->pub.capability;
+ found->ts = tmp->ts;
+ found->ts_boottime = tmp->ts_boottime;
+ found->parent_tsf = tmp->parent_tsf;
+ found->pub.chains = tmp->pub.chains;
+ memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
+ IEEE80211_MAX_CHAINS);
+ ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
+ } else {
+ struct cfg80211_internal_bss *new;
+ struct cfg80211_internal_bss *hidden;
+ struct cfg80211_bss_ies *ies;
+
+ /*
+ * create a copy -- the "res" variable that is passed in
+ * is allocated on the stack since it's not needed in the
+ * more common case of an update
+ */
+ new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
+ GFP_ATOMIC);
+ if (!new) {
+ ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
+ if (ies)
+ kfree_rcu(ies, rcu_head);
+ ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
+ if (ies)
+ kfree_rcu(ies, rcu_head);
+ goto drop;
+ }
+ memcpy(new, tmp, sizeof(*new));
+ new->refcount = 1;
+ INIT_LIST_HEAD(&new->hidden_list);
+
+ if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
+ hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
+ if (!hidden)
+ hidden = rb_find_bss(rdev, tmp,
+ BSS_CMP_HIDE_NUL);
+ if (hidden) {
+ new->pub.hidden_beacon_bss = &hidden->pub;
+ list_add(&new->hidden_list,
+ &hidden->hidden_list);
+ hidden->refcount++;
+ rcu_assign_pointer(new->pub.beacon_ies,
+ hidden->pub.beacon_ies);
+ }
+ } else {
+ /*
+ * Ok so we found a beacon, and don't have an entry. If
+ * it's a beacon with hidden SSID, we might be in for an
+ * expensive search for any probe responses that should
+ * be grouped with this beacon for updates ...
+ */
+ if (!cfg80211_combine_bsses(rdev, new)) {
+ kfree(new);
+ goto drop;
+ }
+ }
+
+ if (rdev->bss_entries >= bss_entries_limit &&
+ !cfg80211_bss_expire_oldest(rdev)) {
+ kfree(new);
+ goto drop;
+ }
+
+ list_add_tail(&new->list, &rdev->bss_list);
+ rdev->bss_entries++;
+ rb_insert_bss(rdev, new);
+ found = new;
+ }
+
+ rdev->bss_generation++;
+ bss_ref_get(rdev, found);
+ spin_unlock_bh(&rdev->bss_lock);
+
+ return found;
+ drop:
+ spin_unlock_bh(&rdev->bss_lock);
+ return NULL;
+}
+
+/*
+ * Update RX channel information based on the available frame payload
+ * information. This is mainly for the 2.4 GHz band where frames can be received
+ * from neighboring channels and the Beacon frames use the DSSS Parameter Set
+ * element to indicate the current (transmitting) channel, but this might also
+ * be needed on other bands if RX frequency does not match with the actual
+ * operating channel of a BSS.
+ */
+static struct ieee80211_channel *
+cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
+ struct ieee80211_channel *channel,
+ enum nl80211_bss_scan_width scan_width)
+{
+ const u8 *tmp;
+ u32 freq;
+ int channel_number = -1;
+ struct ieee80211_channel *alt_channel;
+
+ tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
+ if (tmp && tmp[1] == 1) {
+ channel_number = tmp[2];
+ } else {
+ tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
+ if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
+ struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
+
+ channel_number = htop->primary_chan;
+ }
+ }
+
+ if (channel_number < 0) {
+ /* No channel information in frame payload */
+ return channel;
+ }
+
+ freq = ieee80211_channel_to_frequency(channel_number, channel->band);
+ alt_channel = ieee80211_get_channel(wiphy, freq);
+ if (!alt_channel) {
+ if (channel->band == NL80211_BAND_2GHZ) {
+ /*
+ * Better not allow unexpected channels when that could
+ * be going beyond the 1-11 range (e.g., discovering
+ * BSS on channel 12 when radio is configured for
+ * channel 11.
+ */
+ return NULL;
+ }
+
+ /* No match for the payload channel number - ignore it */
+ return channel;
+ }
+
+ if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
+ scan_width == NL80211_BSS_CHAN_WIDTH_5) {
+ /*
+ * Ignore channel number in 5 and 10 MHz channels where there
+ * may not be an n:1 or 1:n mapping between frequencies and
+ * channel numbers.
+ */
+ return channel;
+ }
+
+ /*
+ * Use the channel determined through the payload channel number
+ * instead of the RX channel reported by the driver.
+ */
+ if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
+ return NULL;
+ return alt_channel;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+struct cfg80211_bss *
+cfg80211_inform_bss_data(struct wiphy *wiphy,
+ struct cfg80211_inform_bss *data,
+ enum cfg80211_bss_frame_type ftype,
+ const u8 *bssid, u64 tsf, u16 capability,
+ u16 beacon_interval, const u8 *ie, size_t ielen,
+ gfp_t gfp)
+{
+ struct cfg80211_bss_ies *ies;
+ struct ieee80211_channel *channel;
+ struct cfg80211_internal_bss tmp = {}, *res;
+ int bss_type;
+ bool signal_valid;
+
+ if (WARN_ON(!wiphy))
+ return NULL;
+
+ if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+ (data->signal < 0 || data->signal > 100)))
+ return NULL;
+
+ channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
+ data->scan_width);
+ if (!channel)
+ return NULL;
+
+ memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
+ tmp.pub.channel = channel;
+ tmp.pub.scan_width = data->scan_width;
+ tmp.pub.signal = data->signal;
+ tmp.pub.beacon_interval = beacon_interval;
+ tmp.pub.capability = capability;
+ tmp.ts_boottime = data->boottime_ns;
+
+ /*
+ * If we do not know here whether the IEs are from a Beacon or Probe
+ * Response frame, we need to pick one of the options and only use it
+ * with the driver that does not provide the full Beacon/Probe Response
+ * frame. Use Beacon frame pointer to avoid indicating that this should
+ * override the IEs pointer should we have received an earlier
+ * indication of Probe Response data.
+ */
+ ies = kzalloc(sizeof(*ies) + ielen, gfp);
+ if (!ies)
+ return NULL;
+ ies->len = ielen;
+ ies->tsf = tsf;
+ ies->from_beacon = false;
+ memcpy(ies->data, ie, ielen);
+
+ switch (ftype) {
+ case CFG80211_BSS_FTYPE_BEACON:
+ ies->from_beacon = true;
+ /* fall through to assign */
+ case CFG80211_BSS_FTYPE_UNKNOWN:
+ rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+ break;
+ case CFG80211_BSS_FTYPE_PRESP:
+ rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+ break;
+ }
+ rcu_assign_pointer(tmp.pub.ies, ies);
+
+ signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
+ wiphy->max_adj_channel_rssi_comp;
+ res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+ if (!res)
+ return NULL;
+
+ if (channel->band == NL80211_BAND_60GHZ) {
+ bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+ if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+ bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+ regulatory_hint_found_beacon(wiphy, channel, gfp);
+ } else {
+ if (res->pub.capability & WLAN_CAPABILITY_ESS)
+ regulatory_hint_found_beacon(wiphy, channel, gfp);
+ }
+
+ trace_cfg80211_return_bss(&res->pub);
+ /* cfg80211_bss_update gives us a referenced result */
+ return &res->pub;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_data);
+
+/* cfg80211_inform_bss_width_frame helper */
+struct cfg80211_bss *
+cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
+ struct cfg80211_inform_bss *data,
+ struct ieee80211_mgmt *mgmt, size_t len,
+ gfp_t gfp)
+
+{
+ struct cfg80211_internal_bss tmp = {}, *res;
+ struct cfg80211_bss_ies *ies;
+ struct ieee80211_channel *channel;
+ bool signal_valid;
+ size_t ielen = len - offsetof(struct ieee80211_mgmt,
+ u.probe_resp.variable);
+ int bss_type;
+
+ BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
+ offsetof(struct ieee80211_mgmt, u.beacon.variable));
+
+ trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
+
+ if (WARN_ON(!mgmt))
+ return NULL;
+
+ if (WARN_ON(!wiphy))
+ return NULL;
+
+ if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+ (data->signal < 0 || data->signal > 100)))
+ return NULL;
+
+ if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
+ return NULL;
+
+ channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
+ ielen, data->chan, data->scan_width);
+ if (!channel)
+ return NULL;
+
+ ies = kzalloc(sizeof(*ies) + ielen, gfp);
+ if (!ies)
+ return NULL;
+ ies->len = ielen;
+ ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+ ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
+ memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
+
+ if (ieee80211_is_probe_resp(mgmt->frame_control))
+ rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+ else
+ rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+ rcu_assign_pointer(tmp.pub.ies, ies);
+
+ memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
+ tmp.pub.channel = channel;
+ tmp.pub.scan_width = data->scan_width;
+ tmp.pub.signal = data->signal;
+ tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
+ tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
+ tmp.ts_boottime = data->boottime_ns;
+ tmp.parent_tsf = data->parent_tsf;
+ tmp.pub.chains = data->chains;
+ memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
+ ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
+
+ signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
+ wiphy->max_adj_channel_rssi_comp;
+ res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+ if (!res)
+ return NULL;
+
+ if (channel->band == NL80211_BAND_60GHZ) {
+ bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+ if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+ bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+ regulatory_hint_found_beacon(wiphy, channel, gfp);
+ } else {
+ if (res->pub.capability & WLAN_CAPABILITY_ESS)
+ regulatory_hint_found_beacon(wiphy, channel, gfp);
+ }
+
+ trace_cfg80211_return_bss(&res->pub);
+ /* cfg80211_bss_update gives us a referenced result */
+ return &res->pub;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
+
+void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *bss;
+
+ if (!pub)
+ return;
+
+ bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+ spin_lock_bh(&rdev->bss_lock);
+ bss_ref_get(rdev, bss);
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_ref_bss);
+
+void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *bss;
+
+ if (!pub)
+ return;
+
+ bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+ spin_lock_bh(&rdev->bss_lock);
+ bss_ref_put(rdev, bss);
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_put_bss);
+
+void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *bss;
+
+ if (WARN_ON(!pub))
+ return;
+
+ bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+ spin_lock_bh(&rdev->bss_lock);
+ if (!list_empty(&bss->list)) {
+ if (__cfg80211_unlink_bss(rdev, bss))
+ rdev->bss_generation++;
+ }
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_unlink_bss);
+
+#ifdef CONFIG_CFG80211_WEXT
+static struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
+{
+ struct cfg80211_registered_device *rdev;
+ struct net_device *dev;
+
+ ASSERT_RTNL();
+
+ dev = dev_get_by_index(net, ifindex);
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+ if (dev->ieee80211_ptr)
+ rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
+ else
+ rdev = ERR_PTR(-ENODEV);
+ dev_put(dev);
+ return rdev;
+}
+
+int cfg80211_wext_siwscan(struct net_device *dev,
+ struct iw_request_info *info,
+ union iwreq_data *wrqu, char *extra)
+{
+ struct cfg80211_registered_device *rdev;
+ struct wiphy *wiphy;
+ struct iw_scan_req *wreq = NULL;
+ struct cfg80211_scan_request *creq = NULL;
+ int i, err, n_channels = 0;
+ enum nl80211_band band;
+
+ if (!netif_running(dev))
+ return -ENETDOWN;
+
+ if (wrqu->data.length == sizeof(struct iw_scan_req))
+ wreq = (struct iw_scan_req *)extra;
+
+ rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
+
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+
+ if (rdev->scan_req || rdev->scan_msg) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ wiphy = &rdev->wiphy;
+
+ /* Determine number of channels, needed to allocate creq */
+ if (wreq && wreq->num_channels)
+ n_channels = wreq->num_channels;
+ else
+ n_channels = ieee80211_get_num_supported_channels(wiphy);
+
+ creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
+ n_channels * sizeof(void *),
+ GFP_ATOMIC);
+ if (!creq) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ creq->wiphy = wiphy;
+ creq->wdev = dev->ieee80211_ptr;
+ /* SSIDs come after channels */
+ creq->ssids = (void *)&creq->channels[n_channels];
+ creq->n_channels = n_channels;
+ creq->n_ssids = 1;
+ creq->scan_start = jiffies;
+
+ /* translate "Scan on frequencies" request */
+ i = 0;
+ for (band = 0; band < NUM_NL80211_BANDS; band++) {
+ int j;
+
+ if (!wiphy->bands[band])
+ continue;
+
+ for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
+ /* ignore disabled channels */
+ if (wiphy->bands[band]->channels[j].flags &
+ IEEE80211_CHAN_DISABLED)
+ continue;
+
+ /* If we have a wireless request structure and the
+ * wireless request specifies frequencies, then search
+ * for the matching hardware channel.
+ */
+ if (wreq && wreq->num_channels) {
+ int k;
+ int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
+ for (k = 0; k < wreq->num_channels; k++) {
+ struct iw_freq *freq =
+ &wreq->channel_list[k];
+ int wext_freq =
+ cfg80211_wext_freq(freq);
+
+ if (wext_freq == wiphy_freq)
+ goto wext_freq_found;
+ }
+ goto wext_freq_not_found;
+ }
+
+ wext_freq_found:
+ creq->channels[i] = &wiphy->bands[band]->channels[j];
+ i++;
+ wext_freq_not_found: ;
+ }
+ }
+ /* No channels found? */
+ if (!i) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Set real number of channels specified in creq->channels[] */
+ creq->n_channels = i;
+
+ /* translate "Scan for SSID" request */
+ if (wreq) {
+ if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
+ if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
+ err = -EINVAL;
+ goto out;
+ }
+ memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
+ creq->ssids[0].ssid_len = wreq->essid_len;
+ }
+ if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
+ creq->n_ssids = 0;
+ }
+
+ for (i = 0; i < NUM_NL80211_BANDS; i++)
+ if (wiphy->bands[i])
+ creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
+
+ eth_broadcast_addr(creq->bssid);
+
+ rdev->scan_req = creq;
+ err = rdev_scan(rdev, creq);
+ if (err) {
+ rdev->scan_req = NULL;
+ /* creq will be freed below */
+ } else {
+ nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
+ /* creq now owned by driver */
+ creq = NULL;
+ dev_hold(dev);
+ }
+ out:
+ kfree(creq);
+ return err;
+}
+EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
+
+static char *ieee80211_scan_add_ies(struct iw_request_info *info,
+ const struct cfg80211_bss_ies *ies,
+ char *current_ev, char *end_buf)
+{
+ const u8 *pos, *end, *next;
+ struct iw_event iwe;
+
+ if (!ies)
+ return current_ev;
+
+ /*
+ * If needed, fragment the IEs buffer (at IE boundaries) into short
+ * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
+ */
+ pos = ies->data;
+ end = pos + ies->len;
+
+ while (end - pos > IW_GENERIC_IE_MAX) {
+ next = pos + 2 + pos[1];
+ while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
+ next = next + 2 + next[1];
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVGENIE;
+ iwe.u.data.length = next - pos;
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ pos = next;
+ }
+
+ if (end > pos) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVGENIE;
+ iwe.u.data.length = end - pos;
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ }
+
+ return current_ev;
+}
+
+static char *
+ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
+ struct cfg80211_internal_bss *bss, char *current_ev,
+ char *end_buf)
+{
+ const struct cfg80211_bss_ies *ies;
+ struct iw_event iwe;
+ const u8 *ie;
+ u8 buf[50];
+ u8 *cfg, *p, *tmp;
+ int rem, i, sig;
+ bool ismesh = false;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWAP;
+ iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
+ memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_ADDR_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWFREQ;
+ iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
+ iwe.u.freq.e = 0;
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWFREQ;
+ iwe.u.freq.m = bss->pub.channel->center_freq;
+ iwe.u.freq.e = 6;
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVQUAL;
+ iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
+ IW_QUAL_NOISE_INVALID |
+ IW_QUAL_QUAL_UPDATED;
+ switch (wiphy->signal_type) {
+ case CFG80211_SIGNAL_TYPE_MBM:
+ sig = bss->pub.signal / 100;
+ iwe.u.qual.level = sig;
+ iwe.u.qual.updated |= IW_QUAL_DBM;
+ if (sig < -110) /* rather bad */
+ sig = -110;
+ else if (sig > -40) /* perfect */
+ sig = -40;
+ /* will give a range of 0 .. 70 */
+ iwe.u.qual.qual = sig + 110;
+ break;
+ case CFG80211_SIGNAL_TYPE_UNSPEC:
+ iwe.u.qual.level = bss->pub.signal;
+ /* will give range 0 .. 100 */
+ iwe.u.qual.qual = bss->pub.signal;
+ break;
+ default:
+ /* not reached */
+ break;
+ }
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_QUAL_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ }
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWENCODE;
+ if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
+ iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
+ else
+ iwe.u.data.flags = IW_ENCODE_DISABLED;
+ iwe.u.data.length = 0;
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, "");
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ rcu_read_lock();
+ ies = rcu_dereference(bss->pub.ies);
+ rem = ies->len;
+ ie = ies->data;
+
+ while (rem >= 2) {
+ /* invalid data */
+ if (ie[1] > rem - 2)
+ break;
+
+ switch (ie[0]) {
+ case WLAN_EID_SSID:
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWESSID;
+ iwe.u.data.length = ie[1];
+ iwe.u.data.flags = 1;
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_MESH_ID:
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWESSID;
+ iwe.u.data.length = ie[1];
+ iwe.u.data.flags = 1;
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_MESH_CONFIG:
+ ismesh = true;
+ if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
+ break;
+ cfg = (u8 *)ie + 2;
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, "Mesh Network Path Selection Protocol ID: "
+ "0x%02X", cfg[0]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Path Selection Metric ID: 0x%02X",
+ cfg[1]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Congestion Control Mode ID: 0x%02X",
+ cfg[2]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_SUPP_RATES:
+ case WLAN_EID_EXT_SUPP_RATES:
+ /* display all supported rates in readable format */
+ p = current_ev + iwe_stream_lcp_len(info);
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWRATE;
+ /* Those two flags are ignored... */
+ iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
+
+ for (i = 0; i < ie[1]; i++) {
+ iwe.u.bitrate.value =
+ ((ie[i + 2] & 0x7f) * 500000);
+ tmp = p;
+ p = iwe_stream_add_value(info, current_ev, p,
+ end_buf, &iwe,
+ IW_EV_PARAM_LEN);
+ if (p == tmp) {
+ current_ev = ERR_PTR(-E2BIG);
+ goto unlock;
+ }
+ }
+ current_ev = p;
+ break;
+ }
+ rem -= ie[1] + 2;
+ ie += ie[1] + 2;
+ }
+
+ if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
+ ismesh) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWMODE;
+ if (ismesh)
+ iwe.u.mode = IW_MODE_MESH;
+ else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
+ iwe.u.mode = IW_MODE_MASTER;
+ else
+ iwe.u.mode = IW_MODE_ADHOC;
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_UINT_LEN);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ }
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, " Last beacon: %ums ago",
+ elapsed_jiffies_msecs(bss->ts));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+
+ current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
+
+ unlock:
+ rcu_read_unlock();
+ return current_ev;
+}
+
+
+static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
+ struct iw_request_info *info,
+ char *buf, size_t len)
+{
+ char *current_ev = buf;
+ char *end_buf = buf + len;
+ struct cfg80211_internal_bss *bss;
+ int err = 0;
+
+ spin_lock_bh(&rdev->bss_lock);
+ cfg80211_bss_expire(rdev);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
+ err = -E2BIG;
+ break;
+ }
+ current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
+ current_ev, end_buf);
+ if (IS_ERR(current_ev)) {
+ err = PTR_ERR(current_ev);
+ break;
+ }
+ }
+ spin_unlock_bh(&rdev->bss_lock);
+
+ if (err)
+ return err;
+ return current_ev - buf;
+}
+
+
+int cfg80211_wext_giwscan(struct net_device *dev,
+ struct iw_request_info *info,
+ struct iw_point *data, char *extra)
+{
+ struct cfg80211_registered_device *rdev;
+ int res;
+
+ if (!netif_running(dev))
+ return -ENETDOWN;
+
+ rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
+
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+
+ if (rdev->scan_req || rdev->scan_msg)
+ return -EAGAIN;
+
+ res = ieee80211_scan_results(rdev, info, extra, data->length);
+ data->length = 0;
+ if (res >= 0) {
+ data->length = res;
+ res = 0;
+ }
+
+ return res;
+}
+EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
+#endif