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1532 lines
39 KiB
C
1532 lines
39 KiB
C
/*
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* cfg80211 scan result handling
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*
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* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/wireless.h>
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#include <linux/nl80211.h>
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#include <linux/etherdevice.h>
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#include <net/arp.h>
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#include <net/cfg80211.h>
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#include <net/cfg80211-wext.h>
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#include <net/iw_handler.h>
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#include "core.h"
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#include "nl80211.h"
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#include "wext-compat.h"
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#include "rdev-ops.h"
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/**
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* DOC: BSS tree/list structure
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*
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* At the top level, the BSS list is kept in both a list in each
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* registered device (@bss_list) as well as an RB-tree for faster
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* lookup. In the RB-tree, entries can be looked up using their
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* channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
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* for other BSSes.
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*
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* Due to the possibility of hidden SSIDs, there's a second level
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* structure, the "hidden_list" and "hidden_beacon_bss" pointer.
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* The hidden_list connects all BSSes belonging to a single AP
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* that has a hidden SSID, and connects beacon and probe response
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* entries. For a probe response entry for a hidden SSID, the
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* hidden_beacon_bss pointer points to the BSS struct holding the
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* beacon's information.
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*
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* Reference counting is done for all these references except for
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* the hidden_list, so that a beacon BSS struct that is otherwise
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* not referenced has one reference for being on the bss_list and
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* one for each probe response entry that points to it using the
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* hidden_beacon_bss pointer. When a BSS struct that has such a
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* pointer is get/put, the refcount update is also propagated to
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* the referenced struct, this ensure that it cannot get removed
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* while somebody is using the probe response version.
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*
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* Note that the hidden_beacon_bss pointer never changes, due to
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* the reference counting. Therefore, no locking is needed for
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* it.
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*
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* Also note that the hidden_beacon_bss pointer is only relevant
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* if the driver uses something other than the IEs, e.g. private
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* data stored stored in the BSS struct, since the beacon IEs are
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* also linked into the probe response struct.
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*/
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#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
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static void bss_free(struct cfg80211_internal_bss *bss)
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{
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struct cfg80211_bss_ies *ies;
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if (WARN_ON(atomic_read(&bss->hold)))
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return;
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ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
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if (ies && !bss->pub.hidden_beacon_bss)
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kfree_rcu(ies, rcu_head);
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ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
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if (ies)
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kfree_rcu(ies, rcu_head);
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/*
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* This happens when the module is removed, it doesn't
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* really matter any more save for completeness
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*/
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if (!list_empty(&bss->hidden_list))
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list_del(&bss->hidden_list);
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kfree(bss);
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}
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static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
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struct cfg80211_internal_bss *bss)
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{
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lockdep_assert_held(&rdev->bss_lock);
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bss->refcount++;
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if (bss->pub.hidden_beacon_bss) {
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bss = container_of(bss->pub.hidden_beacon_bss,
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struct cfg80211_internal_bss,
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pub);
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bss->refcount++;
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}
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}
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static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
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struct cfg80211_internal_bss *bss)
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{
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lockdep_assert_held(&rdev->bss_lock);
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if (bss->pub.hidden_beacon_bss) {
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struct cfg80211_internal_bss *hbss;
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hbss = container_of(bss->pub.hidden_beacon_bss,
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struct cfg80211_internal_bss,
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pub);
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hbss->refcount--;
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if (hbss->refcount == 0)
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bss_free(hbss);
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}
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bss->refcount--;
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if (bss->refcount == 0)
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bss_free(bss);
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}
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static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
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struct cfg80211_internal_bss *bss)
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{
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lockdep_assert_held(&rdev->bss_lock);
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if (!list_empty(&bss->hidden_list)) {
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/*
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* don't remove the beacon entry if it has
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* probe responses associated with it
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*/
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if (!bss->pub.hidden_beacon_bss)
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return false;
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/*
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* if it's a probe response entry break its
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* link to the other entries in the group
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*/
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list_del_init(&bss->hidden_list);
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}
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list_del_init(&bss->list);
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rb_erase(&bss->rbn, &rdev->bss_tree);
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bss_ref_put(rdev, bss);
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return true;
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}
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static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
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unsigned long expire_time)
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{
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struct cfg80211_internal_bss *bss, *tmp;
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bool expired = false;
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lockdep_assert_held(&rdev->bss_lock);
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list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
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if (atomic_read(&bss->hold))
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continue;
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if (!time_after(expire_time, bss->ts))
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continue;
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if (__cfg80211_unlink_bss(rdev, bss))
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expired = true;
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}
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if (expired)
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rdev->bss_generation++;
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}
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void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
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bool send_message)
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{
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struct cfg80211_scan_request *request;
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struct wireless_dev *wdev;
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struct sk_buff *msg;
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#ifdef CONFIG_CFG80211_WEXT
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union iwreq_data wrqu;
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#endif
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ASSERT_RTNL();
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if (rdev->scan_msg) {
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nl80211_send_scan_result(rdev, rdev->scan_msg);
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rdev->scan_msg = NULL;
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return;
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}
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request = rdev->scan_req;
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if (!request)
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return;
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wdev = request->wdev;
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/*
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* This must be before sending the other events!
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* Otherwise, wpa_supplicant gets completely confused with
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* wext events.
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*/
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if (wdev->netdev)
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cfg80211_sme_scan_done(wdev->netdev);
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if (!request->aborted &&
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request->flags & NL80211_SCAN_FLAG_FLUSH) {
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/* flush entries from previous scans */
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spin_lock_bh(&rdev->bss_lock);
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__cfg80211_bss_expire(rdev, request->scan_start);
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spin_unlock_bh(&rdev->bss_lock);
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}
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msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
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#ifdef CONFIG_CFG80211_WEXT
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if (wdev->netdev && !request->aborted) {
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memset(&wrqu, 0, sizeof(wrqu));
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wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
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}
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#endif
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if (wdev->netdev)
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dev_put(wdev->netdev);
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rdev->scan_req = NULL;
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kfree(request);
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if (!send_message)
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rdev->scan_msg = msg;
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else
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nl80211_send_scan_result(rdev, msg);
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}
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void __cfg80211_scan_done(struct work_struct *wk)
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{
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struct cfg80211_registered_device *rdev;
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rdev = container_of(wk, struct cfg80211_registered_device,
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scan_done_wk);
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rtnl_lock();
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___cfg80211_scan_done(rdev, true);
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rtnl_unlock();
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}
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void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
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{
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trace_cfg80211_scan_done(request, aborted);
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WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
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request->aborted = aborted;
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request->notified = true;
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queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
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}
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EXPORT_SYMBOL(cfg80211_scan_done);
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void __cfg80211_sched_scan_results(struct work_struct *wk)
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{
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struct cfg80211_registered_device *rdev;
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struct cfg80211_sched_scan_request *request;
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rdev = container_of(wk, struct cfg80211_registered_device,
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sched_scan_results_wk);
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rtnl_lock();
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request = rdev->sched_scan_req;
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/* we don't have sched_scan_req anymore if the scan is stopping */
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if (request) {
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if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
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/* flush entries from previous scans */
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spin_lock_bh(&rdev->bss_lock);
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__cfg80211_bss_expire(rdev, request->scan_start);
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spin_unlock_bh(&rdev->bss_lock);
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request->scan_start =
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jiffies + msecs_to_jiffies(request->interval);
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}
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nl80211_send_sched_scan_results(rdev, request->dev);
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}
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rtnl_unlock();
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}
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void cfg80211_sched_scan_results(struct wiphy *wiphy)
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{
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trace_cfg80211_sched_scan_results(wiphy);
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/* ignore if we're not scanning */
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if (wiphy_to_rdev(wiphy)->sched_scan_req)
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queue_work(cfg80211_wq,
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&wiphy_to_rdev(wiphy)->sched_scan_results_wk);
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}
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EXPORT_SYMBOL(cfg80211_sched_scan_results);
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void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
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ASSERT_RTNL();
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trace_cfg80211_sched_scan_stopped(wiphy);
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__cfg80211_stop_sched_scan(rdev, true);
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}
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EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
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void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
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{
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rtnl_lock();
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cfg80211_sched_scan_stopped_rtnl(wiphy);
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rtnl_unlock();
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}
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EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
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int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
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bool driver_initiated)
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{
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struct net_device *dev;
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ASSERT_RTNL();
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if (!rdev->sched_scan_req)
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return -ENOENT;
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dev = rdev->sched_scan_req->dev;
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if (!driver_initiated) {
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int err = rdev_sched_scan_stop(rdev, dev);
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if (err)
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return err;
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}
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nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
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kfree(rdev->sched_scan_req);
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rdev->sched_scan_req = NULL;
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return 0;
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}
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void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
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unsigned long age_secs)
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{
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struct cfg80211_internal_bss *bss;
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unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
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spin_lock_bh(&rdev->bss_lock);
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list_for_each_entry(bss, &rdev->bss_list, list)
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bss->ts -= age_jiffies;
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spin_unlock_bh(&rdev->bss_lock);
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}
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void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
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{
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__cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
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}
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const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
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{
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while (len > 2 && ies[0] != eid) {
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len -= ies[1] + 2;
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ies += ies[1] + 2;
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}
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if (len < 2)
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return NULL;
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if (len < 2 + ies[1])
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return NULL;
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return ies;
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}
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EXPORT_SYMBOL(cfg80211_find_ie);
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const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
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const u8 *ies, int len)
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{
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struct ieee80211_vendor_ie *ie;
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const u8 *pos = ies, *end = ies + len;
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int ie_oui;
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while (pos < end) {
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pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
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end - pos);
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if (!pos)
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return NULL;
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ie = (struct ieee80211_vendor_ie *)pos;
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/* make sure we can access ie->len */
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BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
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if (ie->len < sizeof(*ie))
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goto cont;
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ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
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if (ie_oui == oui && ie->oui_type == oui_type)
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return pos;
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cont:
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pos += 2 + ie->len;
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}
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return NULL;
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}
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EXPORT_SYMBOL(cfg80211_find_vendor_ie);
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static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
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const u8 *ssid, size_t ssid_len)
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{
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const struct cfg80211_bss_ies *ies;
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const u8 *ssidie;
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if (bssid && !ether_addr_equal(a->bssid, bssid))
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return false;
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if (!ssid)
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return true;
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ies = rcu_access_pointer(a->ies);
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if (!ies)
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return false;
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ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
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if (!ssidie)
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return false;
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if (ssidie[1] != ssid_len)
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return false;
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return memcmp(ssidie + 2, ssid, ssid_len) == 0;
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}
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/**
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* enum bss_compare_mode - BSS compare mode
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* @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
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* @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
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* @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
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*/
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enum bss_compare_mode {
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BSS_CMP_REGULAR,
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BSS_CMP_HIDE_ZLEN,
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BSS_CMP_HIDE_NUL,
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};
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static int cmp_bss(struct cfg80211_bss *a,
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struct cfg80211_bss *b,
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enum bss_compare_mode mode)
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{
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const struct cfg80211_bss_ies *a_ies, *b_ies;
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const u8 *ie1 = NULL;
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const u8 *ie2 = NULL;
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int i, r;
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if (a->channel != b->channel)
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return b->channel->center_freq - a->channel->center_freq;
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a_ies = rcu_access_pointer(a->ies);
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if (!a_ies)
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return -1;
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b_ies = rcu_access_pointer(b->ies);
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if (!b_ies)
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return 1;
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|
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if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
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ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
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a_ies->data, a_ies->len);
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if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
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ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
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b_ies->data, b_ies->len);
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if (ie1 && ie2) {
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int mesh_id_cmp;
|
|
|
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if (ie1[1] == ie2[1])
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mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
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else
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mesh_id_cmp = ie2[1] - ie1[1];
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|
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ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
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a_ies->data, a_ies->len);
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ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
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b_ies->data, b_ies->len);
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if (ie1 && ie2) {
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if (mesh_id_cmp)
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return mesh_id_cmp;
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if (ie1[1] != ie2[1])
|
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return ie2[1] - ie1[1];
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return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
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}
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}
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|
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r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
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if (r)
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return r;
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|
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ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
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ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
|
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|
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if (!ie1 && !ie2)
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return 0;
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|
|
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/*
|
|
* Note that with "hide_ssid", the function returns a match if
|
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* the already-present BSS ("b") is a hidden SSID beacon for
|
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* the new BSS ("a").
|
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*/
|
|
|
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/* sort missing IE before (left of) present IE */
|
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if (!ie1)
|
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return -1;
|
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if (!ie2)
|
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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;
|
|
}
|
|
}
|
|
|
|
/* 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,
|
|
u16 capa_mask, u16 capa_val)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
struct cfg80211_internal_bss *bss, *res = NULL;
|
|
unsigned long now = jiffies;
|
|
|
|
trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
|
|
capa_val);
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
|
|
list_for_each_entry(bss, &rdev->bss_list, list) {
|
|
if ((bss->pub.capability & capa_mask) != capa_val)
|
|
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;
|
|
|
|
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) {
|
|
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);
|
|
}
|
|
|
|
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;
|
|
} 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;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&new->list, &rdev->bss_list);
|
|
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;
|
|
}
|
|
|
|
static struct ieee80211_channel *
|
|
cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
|
|
struct ieee80211_channel *channel)
|
|
{
|
|
const u8 *tmp;
|
|
u32 freq;
|
|
int channel_number = -1;
|
|
|
|
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)
|
|
return channel;
|
|
|
|
freq = ieee80211_channel_to_frequency(channel_number, channel->band);
|
|
channel = ieee80211_get_channel(wiphy, freq);
|
|
if (!channel)
|
|
return NULL;
|
|
if (channel->flags & IEEE80211_CHAN_DISABLED)
|
|
return NULL;
|
|
return channel;
|
|
}
|
|
|
|
/* Returned bss is reference counted and must be cleaned up appropriately. */
|
|
struct cfg80211_bss*
|
|
cfg80211_inform_bss_width(struct wiphy *wiphy,
|
|
struct ieee80211_channel *rx_channel,
|
|
enum nl80211_bss_scan_width scan_width,
|
|
const u8 *bssid, u64 tsf, u16 capability,
|
|
u16 beacon_interval, const u8 *ie, size_t ielen,
|
|
s32 signal, gfp_t gfp)
|
|
{
|
|
struct cfg80211_bss_ies *ies;
|
|
struct ieee80211_channel *channel;
|
|
struct cfg80211_internal_bss tmp = {}, *res;
|
|
bool signal_valid;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(signal < 0 || signal > 100)))
|
|
return NULL;
|
|
|
|
channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
|
|
tmp.pub.channel = channel;
|
|
tmp.pub.scan_width = scan_width;
|
|
tmp.pub.signal = signal;
|
|
tmp.pub.beacon_interval = beacon_interval;
|
|
tmp.pub.capability = capability;
|
|
/*
|
|
* Since 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 = kmalloc(sizeof(*ies) + ielen, gfp);
|
|
if (!ies)
|
|
return NULL;
|
|
ies->len = ielen;
|
|
ies->tsf = tsf;
|
|
memcpy(ies->data, ie, ielen);
|
|
|
|
rcu_assign_pointer(tmp.pub.beacon_ies, ies);
|
|
rcu_assign_pointer(tmp.pub.ies, ies);
|
|
|
|
signal_valid = abs(rx_channel->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 (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_width);
|
|
|
|
/* Returned bss is reference counted and must be cleaned up appropriately. */
|
|
struct cfg80211_bss *
|
|
cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
|
|
struct ieee80211_channel *rx_channel,
|
|
enum nl80211_bss_scan_width scan_width,
|
|
struct ieee80211_mgmt *mgmt, size_t len,
|
|
s32 signal, 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);
|
|
|
|
BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
|
|
offsetof(struct ieee80211_mgmt, u.beacon.variable));
|
|
|
|
trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt,
|
|
len, signal);
|
|
|
|
if (WARN_ON(!mgmt))
|
|
return NULL;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(signal < 0 || 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, rx_channel);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
ies = kmalloc(sizeof(*ies) + ielen, gfp);
|
|
if (!ies)
|
|
return NULL;
|
|
ies->len = ielen;
|
|
ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
|
|
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 = scan_width;
|
|
tmp.pub.signal = 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);
|
|
|
|
signal_valid = abs(rx_channel->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 (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_width_frame);
|
|
|
|
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 ieee80211_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 < IEEE80211_NUM_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 < IEEE80211_NUM_BANDS; i++)
|
|
if (wiphy->bands[i])
|
|
creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
|
|
|
|
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_SYMBOL_GPL(cfg80211_wext_siwscan);
|
|
|
|
static void 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;
|
|
|
|
/*
|
|
* 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(info, *current_ev,
|
|
end_buf, &iwe,
|
|
(void *)pos);
|
|
|
|
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(info, *current_ev,
|
|
end_buf, &iwe,
|
|
(void *)pos);
|
|
}
|
|
}
|
|
|
|
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, *cfg, *p;
|
|
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(info, current_ev, end_buf, &iwe,
|
|
IW_EV_ADDR_LEN);
|
|
|
|
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(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
|
|
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(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
|
|
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(info, current_ev, end_buf,
|
|
&iwe, IW_EV_QUAL_LEN);
|
|
}
|
|
|
|
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(info, current_ev, end_buf,
|
|
&iwe, "");
|
|
|
|
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(info, current_ev, end_buf,
|
|
&iwe, (u8 *)ie + 2);
|
|
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(info, current_ev, end_buf,
|
|
&iwe, (u8 *)ie + 2);
|
|
break;
|
|
case WLAN_EID_MESH_CONFIG:
|
|
ismesh = true;
|
|
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
|
|
break;
|
|
buf = kmalloc(50, GFP_ATOMIC);
|
|
if (!buf)
|
|
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(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Metric ID: 0x%02X",
|
|
cfg[1]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Congestion Control Mode ID: 0x%02X",
|
|
cfg[2]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
kfree(buf);
|
|
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);
|
|
p = iwe_stream_add_value(info, current_ev, p,
|
|
end_buf, &iwe, IW_EV_PARAM_LEN);
|
|
}
|
|
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(info, current_ev, end_buf,
|
|
&iwe, IW_EV_UINT_LEN);
|
|
}
|
|
|
|
buf = kmalloc(31, GFP_ATOMIC);
|
|
if (buf) {
|
|
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(info, current_ev, end_buf,
|
|
&iwe, buf);
|
|
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(info, current_ev,
|
|
end_buf, &iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
|
|
ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf);
|
|
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;
|
|
|
|
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) {
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
return -E2BIG;
|
|
}
|
|
current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
|
|
current_ev, end_buf);
|
|
}
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
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_SYMBOL_GPL(cfg80211_wext_giwscan);
|
|
#endif
|