3174 lines
83 KiB
C
3174 lines
83 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* Copyright 2013-2014 Intel Mobile Communications GmbH
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* Copyright 2016 Intel Deutschland GmbH
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* Copyright (C) 2018-2023 Intel Corporation
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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 <linux/crc32.h>
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#include <linux/bitfield.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 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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/*
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* Limit the number of BSS entries stored in mac80211. Each one is
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* a bit over 4k at most, so this limits to roughly 4-5M of memory.
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* If somebody wants to really attack this though, they'd likely
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* use small beacons, and only one type of frame, limiting each of
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* the entries to a much smaller size (in order to generate more
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* entries in total, so overhead is bigger.)
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*/
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static int bss_entries_limit = 1000;
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module_param(bss_entries_limit, int, 0644);
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MODULE_PARM_DESC(bss_entries_limit,
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"limit to number of scan BSS entries (per wiphy, default 1000)");
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#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
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/**
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* struct cfg80211_colocated_ap - colocated AP information
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*
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* @list: linked list to all colocated aPS
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* @bssid: BSSID of the reported AP
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* @ssid: SSID of the reported AP
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* @ssid_len: length of the ssid
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* @center_freq: frequency the reported AP is on
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* @unsolicited_probe: the reported AP is part of an ESS, where all the APs
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* that operate in the same channel as the reported AP and that might be
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* detected by a STA receiving this frame, are transmitting unsolicited
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* Probe Response frames every 20 TUs
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* @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
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* @same_ssid: the reported AP has the same SSID as the reporting AP
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* @multi_bss: the reported AP is part of a multiple BSSID set
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* @transmitted_bssid: the reported AP is the transmitting BSSID
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* @colocated_ess: all the APs that share the same ESS as the reported AP are
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* colocated and can be discovered via legacy bands.
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* @short_ssid_valid: short_ssid is valid and can be used
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* @short_ssid: the short SSID for this SSID
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*/
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struct cfg80211_colocated_ap {
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struct list_head list;
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u8 bssid[ETH_ALEN];
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u8 ssid[IEEE80211_MAX_SSID_LEN];
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size_t ssid_len;
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u32 short_ssid;
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u32 center_freq;
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u8 unsolicited_probe:1,
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oct_recommended:1,
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same_ssid:1,
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multi_bss:1,
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transmitted_bssid:1,
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colocated_ess:1,
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short_ssid_valid:1;
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};
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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_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
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if (bss->pub.transmitted_bss)
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bss_from_pub(bss->pub.transmitted_bss)->refcount++;
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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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if (bss->pub.transmitted_bss) {
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struct cfg80211_internal_bss *tbss;
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tbss = container_of(bss->pub.transmitted_bss,
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struct cfg80211_internal_bss,
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pub);
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tbss->refcount--;
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if (tbss->refcount == 0)
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bss_free(tbss);
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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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list_del_init(&bss->pub.nontrans_list);
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rb_erase(&bss->rbn, &rdev->bss_tree);
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rdev->bss_entries--;
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WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
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"rdev bss entries[%d]/list[empty:%d] corruption\n",
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rdev->bss_entries, list_empty(&rdev->bss_list));
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bss_ref_put(rdev, bss);
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return true;
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}
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bool cfg80211_is_element_inherited(const struct element *elem,
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const struct element *non_inherit_elem)
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{
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u8 id_len, ext_id_len, i, loop_len, id;
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const u8 *list;
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if (elem->id == WLAN_EID_MULTIPLE_BSSID)
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return false;
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if (!non_inherit_elem || non_inherit_elem->datalen < 2)
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return true;
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/*
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* non inheritance element format is:
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* ext ID (56) | IDs list len | list | extension IDs list len | list
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* Both lists are optional. Both lengths are mandatory.
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* This means valid length is:
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* elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
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*/
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id_len = non_inherit_elem->data[1];
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if (non_inherit_elem->datalen < 3 + id_len)
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return true;
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ext_id_len = non_inherit_elem->data[2 + id_len];
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if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
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return true;
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if (elem->id == WLAN_EID_EXTENSION) {
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if (!ext_id_len)
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return true;
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loop_len = ext_id_len;
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list = &non_inherit_elem->data[3 + id_len];
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id = elem->data[0];
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} else {
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if (!id_len)
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return true;
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loop_len = id_len;
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list = &non_inherit_elem->data[2];
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id = elem->id;
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}
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for (i = 0; i < loop_len; i++) {
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if (list[i] == id)
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return false;
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}
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return true;
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}
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EXPORT_SYMBOL(cfg80211_is_element_inherited);
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static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
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const u8 *ie, size_t ie_len,
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u8 **pos, u8 *buf, size_t buf_len)
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{
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if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
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elem->data + elem->datalen > ie + ie_len))
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return 0;
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if (elem->datalen + 2 > buf + buf_len - *pos)
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return 0;
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memcpy(*pos, elem, elem->datalen + 2);
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*pos += elem->datalen + 2;
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/* Finish if it is not fragmented */
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if (elem->datalen != 255)
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return *pos - buf;
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ie_len = ie + ie_len - elem->data - elem->datalen;
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ie = (const u8 *)elem->data + elem->datalen;
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for_each_element(elem, ie, ie_len) {
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if (elem->id != WLAN_EID_FRAGMENT)
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break;
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if (elem->datalen + 2 > buf + buf_len - *pos)
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return 0;
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memcpy(*pos, elem, elem->datalen + 2);
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*pos += elem->datalen + 2;
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if (elem->datalen != 255)
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break;
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}
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return *pos - buf;
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}
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static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
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const u8 *subie, size_t subie_len,
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u8 *new_ie, size_t new_ie_len)
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{
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const struct element *non_inherit_elem, *parent, *sub;
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u8 *pos = new_ie;
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u8 id, ext_id;
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unsigned int match_len;
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non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
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subie, subie_len);
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/* We copy the elements one by one from the parent to the generated
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* elements.
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* If they are not inherited (included in subie or in the non
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* inheritance element), then we copy all occurrences the first time
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* we see this element type.
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*/
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for_each_element(parent, ie, ielen) {
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if (parent->id == WLAN_EID_FRAGMENT)
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continue;
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if (parent->id == WLAN_EID_EXTENSION) {
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if (parent->datalen < 1)
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continue;
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id = WLAN_EID_EXTENSION;
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ext_id = parent->data[0];
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match_len = 1;
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} else {
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id = parent->id;
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match_len = 0;
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}
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/* Find first occurrence in subie */
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sub = cfg80211_find_elem_match(id, subie, subie_len,
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&ext_id, match_len, 0);
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/* Copy from parent if not in subie and inherited */
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if (!sub &&
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cfg80211_is_element_inherited(parent, non_inherit_elem)) {
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if (!cfg80211_copy_elem_with_frags(parent,
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ie, ielen,
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&pos, new_ie,
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new_ie_len))
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return 0;
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continue;
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}
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/* Already copied if an earlier element had the same type */
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if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
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&ext_id, match_len, 0))
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continue;
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/* Not inheriting, copy all similar elements from subie */
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while (sub) {
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if (!cfg80211_copy_elem_with_frags(sub,
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subie, subie_len,
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&pos, new_ie,
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new_ie_len))
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return 0;
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sub = cfg80211_find_elem_match(id,
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sub->data + sub->datalen,
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subie_len + subie -
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(sub->data +
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sub->datalen),
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&ext_id, match_len, 0);
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}
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}
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/* The above misses elements that are included in subie but not in the
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* parent, so do a pass over subie and append those.
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* Skip the non-tx BSSID caps and non-inheritance element.
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*/
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for_each_element(sub, subie, subie_len) {
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if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
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continue;
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if (sub->id == WLAN_EID_FRAGMENT)
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continue;
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if (sub->id == WLAN_EID_EXTENSION) {
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if (sub->datalen < 1)
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continue;
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id = WLAN_EID_EXTENSION;
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ext_id = sub->data[0];
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match_len = 1;
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if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
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continue;
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} else {
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id = sub->id;
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match_len = 0;
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}
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/* Processed if one was included in the parent */
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if (cfg80211_find_elem_match(id, ie, ielen,
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&ext_id, match_len, 0))
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continue;
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if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
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&pos, new_ie, new_ie_len))
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return 0;
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}
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return pos - new_ie;
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}
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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 struct element *ssid_elem;
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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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ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
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if (!ssid_elem)
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return false;
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if (ssid_elem->datalen != ssid_len)
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return false;
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return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
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}
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static int
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cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
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struct cfg80211_bss *nontrans_bss)
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{
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const struct element *ssid_elem;
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struct cfg80211_bss *bss = NULL;
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rcu_read_lock();
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ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
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if (!ssid_elem) {
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rcu_read_unlock();
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return -EINVAL;
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}
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/* check if nontrans_bss is in the list */
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list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
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if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data,
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ssid_elem->datalen)) {
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rcu_read_unlock();
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return 0;
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}
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}
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rcu_read_unlock();
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/*
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* This is a bit weird - it's not on the list, but already on another
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* one! The only way that could happen is if there's some BSSID/SSID
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* shared by multiple APs in their multi-BSSID profiles, potentially
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* with hidden SSID mixed in ... ignore it.
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*/
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if (!list_empty(&nontrans_bss->nontrans_list))
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return -EINVAL;
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|
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/* add to the list */
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list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
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return 0;
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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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|
|
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;
|
|
}
|
|
|
|
static u8 cfg80211_parse_bss_param(u8 data,
|
|
struct cfg80211_colocated_ap *coloc_ap)
|
|
{
|
|
coloc_ap->oct_recommended =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
|
|
coloc_ap->same_ssid =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
|
|
coloc_ap->multi_bss =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
|
|
coloc_ap->transmitted_bssid =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
|
|
coloc_ap->unsolicited_probe =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
|
|
coloc_ap->colocated_ess =
|
|
u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
|
|
|
|
return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
|
|
}
|
|
|
|
static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
|
|
const struct element **elem, u32 *s_ssid)
|
|
{
|
|
|
|
*elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
|
|
if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
|
|
return -EINVAL;
|
|
|
|
*s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
|
|
return 0;
|
|
}
|
|
|
|
static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
|
|
{
|
|
struct cfg80211_colocated_ap *ap, *tmp_ap;
|
|
|
|
list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
|
|
list_del(&ap->list);
|
|
kfree(ap);
|
|
}
|
|
}
|
|
|
|
static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
|
|
const u8 *pos, u8 length,
|
|
const struct element *ssid_elem,
|
|
int s_ssid_tmp)
|
|
{
|
|
/* skip the TBTT offset */
|
|
pos++;
|
|
|
|
/* ignore entries with invalid BSSID */
|
|
if (!is_valid_ether_addr(pos))
|
|
return -EINVAL;
|
|
|
|
memcpy(entry->bssid, pos, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
|
|
if (length >= IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
|
|
memcpy(&entry->short_ssid, pos,
|
|
sizeof(entry->short_ssid));
|
|
entry->short_ssid_valid = true;
|
|
pos += 4;
|
|
}
|
|
|
|
/* skip non colocated APs */
|
|
if (!cfg80211_parse_bss_param(*pos, entry))
|
|
return -EINVAL;
|
|
pos++;
|
|
|
|
if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
|
|
/*
|
|
* no information about the short ssid. Consider the entry valid
|
|
* for now. It would later be dropped in case there are explicit
|
|
* SSIDs that need to be matched
|
|
*/
|
|
if (!entry->same_ssid)
|
|
return 0;
|
|
}
|
|
|
|
if (entry->same_ssid) {
|
|
entry->short_ssid = s_ssid_tmp;
|
|
entry->short_ssid_valid = true;
|
|
|
|
/*
|
|
* This is safe because we validate datalen in
|
|
* cfg80211_parse_colocated_ap(), before calling this
|
|
* function.
|
|
*/
|
|
memcpy(&entry->ssid, &ssid_elem->data,
|
|
ssid_elem->datalen);
|
|
entry->ssid_len = ssid_elem->datalen;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
|
|
struct list_head *list)
|
|
{
|
|
struct ieee80211_neighbor_ap_info *ap_info;
|
|
const struct element *elem, *ssid_elem;
|
|
const u8 *pos, *end;
|
|
u32 s_ssid_tmp;
|
|
int n_coloc = 0, ret;
|
|
LIST_HEAD(ap_list);
|
|
|
|
elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
|
|
ies->len);
|
|
if (!elem)
|
|
return 0;
|
|
|
|
pos = elem->data;
|
|
end = pos + elem->datalen;
|
|
|
|
ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
|
|
if (ret)
|
|
return 0;
|
|
|
|
/* RNR IE may contain more than one NEIGHBOR_AP_INFO */
|
|
while (pos + sizeof(*ap_info) <= end) {
|
|
enum nl80211_band band;
|
|
int freq;
|
|
u8 length, i, count;
|
|
|
|
ap_info = (void *)pos;
|
|
count = u8_get_bits(ap_info->tbtt_info_hdr,
|
|
IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
|
|
length = ap_info->tbtt_info_len;
|
|
|
|
pos += sizeof(*ap_info);
|
|
|
|
if (!ieee80211_operating_class_to_band(ap_info->op_class,
|
|
&band))
|
|
break;
|
|
|
|
freq = ieee80211_channel_to_frequency(ap_info->channel, band);
|
|
|
|
if (end - pos < count * length)
|
|
break;
|
|
|
|
/*
|
|
* TBTT info must include bss param + BSSID +
|
|
* (short SSID or same_ssid bit to be set).
|
|
* ignore other options, and move to the
|
|
* next AP info
|
|
*/
|
|
if (band != NL80211_BAND_6GHZ ||
|
|
(length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
|
|
length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
|
|
pos += count * length;
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
struct cfg80211_colocated_ap *entry;
|
|
|
|
entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
|
|
GFP_ATOMIC);
|
|
|
|
if (!entry)
|
|
break;
|
|
|
|
entry->center_freq = freq;
|
|
|
|
if (!cfg80211_parse_ap_info(entry, pos, length,
|
|
ssid_elem, s_ssid_tmp)) {
|
|
n_coloc++;
|
|
list_add_tail(&entry->list, &ap_list);
|
|
} else {
|
|
kfree(entry);
|
|
}
|
|
|
|
pos += length;
|
|
}
|
|
}
|
|
|
|
if (pos != end) {
|
|
cfg80211_free_coloc_ap_list(&ap_list);
|
|
return 0;
|
|
}
|
|
|
|
list_splice_tail(&ap_list, list);
|
|
return n_coloc;
|
|
}
|
|
|
|
static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
|
|
struct ieee80211_channel *chan,
|
|
bool add_to_6ghz)
|
|
{
|
|
int i;
|
|
u32 n_channels = request->n_channels;
|
|
struct cfg80211_scan_6ghz_params *params =
|
|
&request->scan_6ghz_params[request->n_6ghz_params];
|
|
|
|
for (i = 0; i < n_channels; i++) {
|
|
if (request->channels[i] == chan) {
|
|
if (add_to_6ghz)
|
|
params->channel_idx = i;
|
|
return;
|
|
}
|
|
}
|
|
|
|
request->channels[n_channels] = chan;
|
|
if (add_to_6ghz)
|
|
request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
|
|
n_channels;
|
|
|
|
request->n_channels++;
|
|
}
|
|
|
|
static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
|
|
struct cfg80211_scan_request *request)
|
|
{
|
|
int i;
|
|
u32 s_ssid;
|
|
|
|
for (i = 0; i < request->n_ssids; i++) {
|
|
/* wildcard ssid in the scan request */
|
|
if (!request->ssids[i].ssid_len) {
|
|
if (ap->multi_bss && !ap->transmitted_bssid)
|
|
continue;
|
|
|
|
return true;
|
|
}
|
|
|
|
if (ap->ssid_len &&
|
|
ap->ssid_len == request->ssids[i].ssid_len) {
|
|
if (!memcmp(request->ssids[i].ssid, ap->ssid,
|
|
ap->ssid_len))
|
|
return true;
|
|
} else if (ap->short_ssid_valid) {
|
|
s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
|
|
request->ssids[i].ssid_len);
|
|
|
|
if (ap->short_ssid == s_ssid)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
|
|
{
|
|
u8 i;
|
|
struct cfg80211_colocated_ap *ap;
|
|
int n_channels, count = 0, err;
|
|
struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
|
|
LIST_HEAD(coloc_ap_list);
|
|
bool need_scan_psc = true;
|
|
const struct ieee80211_sband_iftype_data *iftd;
|
|
|
|
rdev_req->scan_6ghz = true;
|
|
|
|
if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
|
|
return -EOPNOTSUPP;
|
|
|
|
iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
|
|
rdev_req->wdev->iftype);
|
|
if (!iftd || !iftd->he_cap.has_he)
|
|
return -EOPNOTSUPP;
|
|
|
|
n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
|
|
|
|
if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
|
|
struct cfg80211_internal_bss *intbss;
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
list_for_each_entry(intbss, &rdev->bss_list, list) {
|
|
struct cfg80211_bss *res = &intbss->pub;
|
|
const struct cfg80211_bss_ies *ies;
|
|
|
|
ies = rcu_access_pointer(res->ies);
|
|
count += cfg80211_parse_colocated_ap(ies,
|
|
&coloc_ap_list);
|
|
}
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
|
|
request = kzalloc(struct_size(request, channels, n_channels) +
|
|
sizeof(*request->scan_6ghz_params) * count +
|
|
sizeof(*request->ssids) * rdev_req->n_ssids,
|
|
GFP_KERNEL);
|
|
if (!request) {
|
|
cfg80211_free_coloc_ap_list(&coloc_ap_list);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*request = *rdev_req;
|
|
request->n_channels = 0;
|
|
request->scan_6ghz_params =
|
|
(void *)&request->channels[n_channels];
|
|
|
|
/*
|
|
* PSC channels should not be scanned in case of direct scan with 1 SSID
|
|
* and at least one of the reported co-located APs with same SSID
|
|
* indicating that all APs in the same ESS are co-located
|
|
*/
|
|
if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
|
|
list_for_each_entry(ap, &coloc_ap_list, list) {
|
|
if (ap->colocated_ess &&
|
|
cfg80211_find_ssid_match(ap, request)) {
|
|
need_scan_psc = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* add to the scan request the channels that need to be scanned
|
|
* regardless of the collocated APs (PSC channels or all channels
|
|
* in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
|
|
*/
|
|
for (i = 0; i < rdev_req->n_channels; i++) {
|
|
if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
|
|
((need_scan_psc &&
|
|
cfg80211_channel_is_psc(rdev_req->channels[i])) ||
|
|
!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
|
|
cfg80211_scan_req_add_chan(request,
|
|
rdev_req->channels[i],
|
|
false);
|
|
}
|
|
}
|
|
|
|
if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
|
|
goto skip;
|
|
|
|
list_for_each_entry(ap, &coloc_ap_list, list) {
|
|
bool found = false;
|
|
struct cfg80211_scan_6ghz_params *scan_6ghz_params =
|
|
&request->scan_6ghz_params[request->n_6ghz_params];
|
|
struct ieee80211_channel *chan =
|
|
ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
|
|
|
|
if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
|
|
continue;
|
|
|
|
for (i = 0; i < rdev_req->n_channels; i++) {
|
|
if (rdev_req->channels[i] == chan)
|
|
found = true;
|
|
}
|
|
|
|
if (!found)
|
|
continue;
|
|
|
|
if (request->n_ssids > 0 &&
|
|
!cfg80211_find_ssid_match(ap, request))
|
|
continue;
|
|
|
|
if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
|
|
continue;
|
|
|
|
cfg80211_scan_req_add_chan(request, chan, true);
|
|
memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
|
|
scan_6ghz_params->short_ssid = ap->short_ssid;
|
|
scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
|
|
scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
|
|
|
|
/*
|
|
* If a PSC channel is added to the scan and 'need_scan_psc' is
|
|
* set to false, then all the APs that the scan logic is
|
|
* interested with on the channel are collocated and thus there
|
|
* is no need to perform the initial PSC channel listen.
|
|
*/
|
|
if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
|
|
scan_6ghz_params->psc_no_listen = true;
|
|
|
|
request->n_6ghz_params++;
|
|
}
|
|
|
|
skip:
|
|
cfg80211_free_coloc_ap_list(&coloc_ap_list);
|
|
|
|
if (request->n_channels) {
|
|
struct cfg80211_scan_request *old = rdev->int_scan_req;
|
|
rdev->int_scan_req = request;
|
|
|
|
/*
|
|
* Add the ssids from the parent scan request to the new scan
|
|
* request, so the driver would be able to use them in its
|
|
* probe requests to discover hidden APs on PSC channels.
|
|
*/
|
|
request->ssids = (void *)&request->channels[request->n_channels];
|
|
request->n_ssids = rdev_req->n_ssids;
|
|
memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
|
|
request->n_ssids);
|
|
|
|
/*
|
|
* If this scan follows a previous scan, save the scan start
|
|
* info from the first part of the scan
|
|
*/
|
|
if (old)
|
|
rdev->int_scan_req->info = old->info;
|
|
|
|
err = rdev_scan(rdev, request);
|
|
if (err) {
|
|
rdev->int_scan_req = old;
|
|
kfree(request);
|
|
} else {
|
|
kfree(old);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
kfree(request);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int cfg80211_scan(struct cfg80211_registered_device *rdev)
|
|
{
|
|
struct cfg80211_scan_request *request;
|
|
struct cfg80211_scan_request *rdev_req = rdev->scan_req;
|
|
u32 n_channels = 0, idx, i;
|
|
|
|
if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
|
|
return rdev_scan(rdev, rdev_req);
|
|
|
|
for (i = 0; i < rdev_req->n_channels; i++) {
|
|
if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
|
|
n_channels++;
|
|
}
|
|
|
|
if (!n_channels)
|
|
return cfg80211_scan_6ghz(rdev);
|
|
|
|
request = kzalloc(struct_size(request, channels, n_channels),
|
|
GFP_KERNEL);
|
|
if (!request)
|
|
return -ENOMEM;
|
|
|
|
*request = *rdev_req;
|
|
request->n_channels = n_channels;
|
|
|
|
for (i = idx = 0; i < rdev_req->n_channels; i++) {
|
|
if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
|
|
request->channels[idx++] = rdev_req->channels[i];
|
|
}
|
|
|
|
rdev_req->scan_6ghz = false;
|
|
rdev->int_scan_req = request;
|
|
return rdev_scan(rdev, request);
|
|
}
|
|
|
|
void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
|
|
bool send_message)
|
|
{
|
|
struct cfg80211_scan_request *request, *rdev_req;
|
|
struct wireless_dev *wdev;
|
|
struct sk_buff *msg;
|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
union iwreq_data wrqu;
|
|
#endif
|
|
|
|
lockdep_assert_held(&rdev->wiphy.mtx);
|
|
|
|
if (rdev->scan_msg) {
|
|
nl80211_send_scan_msg(rdev, rdev->scan_msg);
|
|
rdev->scan_msg = NULL;
|
|
return;
|
|
}
|
|
|
|
rdev_req = rdev->scan_req;
|
|
if (!rdev_req)
|
|
return;
|
|
|
|
wdev = rdev_req->wdev;
|
|
request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
|
|
|
|
if (wdev_running(wdev) &&
|
|
(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
|
|
!rdev_req->scan_6ghz && !request->info.aborted &&
|
|
!cfg80211_scan_6ghz(rdev))
|
|
return;
|
|
|
|
/*
|
|
* 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
|
|
|
|
dev_put(wdev->netdev);
|
|
|
|
kfree(rdev->int_scan_req);
|
|
rdev->int_scan_req = NULL;
|
|
|
|
kfree(rdev->scan_req);
|
|
rdev->scan_req = NULL;
|
|
|
|
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);
|
|
|
|
wiphy_lock(&rdev->wiphy);
|
|
___cfg80211_scan_done(rdev, true);
|
|
wiphy_unlock(&rdev->wiphy);
|
|
}
|
|
|
|
void cfg80211_scan_done(struct cfg80211_scan_request *request,
|
|
struct cfg80211_scan_info *info)
|
|
{
|
|
struct cfg80211_scan_info old_info = request->info;
|
|
|
|
trace_cfg80211_scan_done(request, info);
|
|
WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
|
|
request != wiphy_to_rdev(request->wiphy)->int_scan_req);
|
|
|
|
request->info = *info;
|
|
|
|
/*
|
|
* In case the scan is split, the scan_start_tsf and tsf_bssid should
|
|
* be of the first part. In such a case old_info.scan_start_tsf should
|
|
* be non zero.
|
|
*/
|
|
if (request->scan_6ghz && old_info.scan_start_tsf) {
|
|
request->info.scan_start_tsf = old_info.scan_start_tsf;
|
|
memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
|
|
sizeof(request->info.tsf_bssid));
|
|
}
|
|
|
|
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)
|
|
{
|
|
lockdep_assert_held(&rdev->wiphy.mtx);
|
|
|
|
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)
|
|
{
|
|
lockdep_assert_held(&rdev->wiphy.mtx);
|
|
|
|
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;
|
|
|
|
list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
|
|
lockdep_is_held(&rdev->wiphy.mtx)) {
|
|
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);
|
|
|
|
wiphy_lock(&rdev->wiphy);
|
|
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);
|
|
}
|
|
}
|
|
wiphy_unlock(&rdev->wiphy);
|
|
}
|
|
|
|
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_locked(struct wiphy *wiphy, u64 reqid)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
|
|
lockdep_assert_held(&wiphy->mtx);
|
|
|
|
trace_cfg80211_sched_scan_stopped(wiphy, reqid);
|
|
|
|
__cfg80211_stop_sched_scan(rdev, reqid, true);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
|
|
|
|
void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
|
|
{
|
|
wiphy_lock(wiphy);
|
|
cfg80211_sched_scan_stopped_locked(wiphy, reqid);
|
|
wiphy_unlock(wiphy);
|
|
}
|
|
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)
|
|
{
|
|
lockdep_assert_held(&rdev->wiphy.mtx);
|
|
|
|
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;
|
|
|
|
lockdep_assert_held(&rdev->wiphy.mtx);
|
|
|
|
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);
|
|
}
|
|
|
|
void cfg80211_bss_flush(struct wiphy *wiphy)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
__cfg80211_bss_expire(rdev, jiffies);
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_bss_flush);
|
|
|
|
const struct element *
|
|
cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
|
|
const u8 *match, unsigned int match_len,
|
|
unsigned int match_offset)
|
|
{
|
|
const struct element *elem;
|
|
|
|
for_each_element_id(elem, eid, ies, len) {
|
|
if (elem->datalen >= match_offset + match_len &&
|
|
!memcmp(elem->data + match_offset, match, match_len))
|
|
return elem;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_find_elem_match);
|
|
|
|
const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
|
|
const u8 *ies,
|
|
unsigned int len)
|
|
{
|
|
const struct element *elem;
|
|
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;
|
|
|
|
elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
|
|
match, match_len, 0);
|
|
|
|
if (!elem || elem->datalen < 4)
|
|
return NULL;
|
|
|
|
return elem;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_find_vendor_elem);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
struct cfg80211_non_tx_bss {
|
|
struct cfg80211_bss *tx_bss;
|
|
u8 max_bssid_indicator;
|
|
u8 bssid_index;
|
|
};
|
|
|
|
static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
|
|
const struct cfg80211_bss_ies *new_ies,
|
|
const struct cfg80211_bss_ies *old_ies)
|
|
{
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
/* Assign beacon IEs to all sub entries */
|
|
list_for_each_entry(bss, &known->hidden_list, hidden_list) {
|
|
const struct cfg80211_bss_ies *ies;
|
|
|
|
ies = rcu_access_pointer(bss->pub.beacon_ies);
|
|
WARN_ON(ies != old_ies);
|
|
|
|
rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
|
|
}
|
|
}
|
|
|
|
static bool
|
|
cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_internal_bss *known,
|
|
struct cfg80211_internal_bss *new,
|
|
bool signal_valid)
|
|
{
|
|
lockdep_assert_held(&rdev->bss_lock);
|
|
|
|
/* Update IEs */
|
|
if (rcu_access_pointer(new->pub.proberesp_ies)) {
|
|
const struct cfg80211_bss_ies *old;
|
|
|
|
old = rcu_access_pointer(known->pub.proberesp_ies);
|
|
|
|
rcu_assign_pointer(known->pub.proberesp_ies,
|
|
new->pub.proberesp_ies);
|
|
/* Override possible earlier Beacon frame IEs */
|
|
rcu_assign_pointer(known->pub.ies,
|
|
new->pub.proberesp_ies);
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
|
|
} else if (rcu_access_pointer(new->pub.beacon_ies)) {
|
|
const struct cfg80211_bss_ies *old;
|
|
|
|
if (known->pub.hidden_beacon_bss &&
|
|
!list_empty(&known->hidden_list)) {
|
|
const struct cfg80211_bss_ies *f;
|
|
|
|
/* The known BSS struct is one of the probe
|
|
* response members of a group, but we're
|
|
* receiving a beacon (beacon_ies in the new
|
|
* 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(new->pub.beacon_ies);
|
|
kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
|
|
return false;
|
|
}
|
|
|
|
old = rcu_access_pointer(known->pub.beacon_ies);
|
|
|
|
rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
|
|
|
|
/* Override IEs if they were from a beacon before */
|
|
if (old == rcu_access_pointer(known->pub.ies))
|
|
rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
|
|
|
|
cfg80211_update_hidden_bsses(known,
|
|
rcu_access_pointer(new->pub.beacon_ies),
|
|
old);
|
|
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
|
|
}
|
|
|
|
known->pub.beacon_interval = new->pub.beacon_interval;
|
|
|
|
/* don't update the signal if beacon was heard on
|
|
* adjacent channel.
|
|
*/
|
|
if (signal_valid)
|
|
known->pub.signal = new->pub.signal;
|
|
known->pub.capability = new->pub.capability;
|
|
known->ts = new->ts;
|
|
known->ts_boottime = new->ts_boottime;
|
|
known->parent_tsf = new->parent_tsf;
|
|
known->pub.chains = new->pub.chains;
|
|
memcpy(known->pub.chain_signal, new->pub.chain_signal,
|
|
IEEE80211_MAX_CHAINS);
|
|
ether_addr_copy(known->parent_bssid, new->parent_bssid);
|
|
known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
|
|
known->pub.bssid_index = new->pub.bssid_index;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Returned bss is reference counted and must be cleaned up appropriately. */
|
|
struct cfg80211_internal_bss *
|
|
cfg80211_bss_update(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_internal_bss *tmp,
|
|
bool signal_valid, unsigned long ts)
|
|
{
|
|
struct cfg80211_internal_bss *found = NULL;
|
|
|
|
if (WARN_ON(!tmp->pub.channel))
|
|
return NULL;
|
|
|
|
tmp->ts = ts;
|
|
|
|
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) {
|
|
if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
|
|
goto drop;
|
|
} 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);
|
|
INIT_LIST_HEAD(&new->pub.nontrans_list);
|
|
/* we'll set this later if it was non-NULL */
|
|
new->pub.transmitted_bss = NULL;
|
|
|
|
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)) {
|
|
bss_ref_put(rdev, new);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (rdev->bss_entries >= bss_entries_limit &&
|
|
!cfg80211_bss_expire_oldest(rdev)) {
|
|
bss_ref_put(rdev, new);
|
|
goto drop;
|
|
}
|
|
|
|
/* This must be before the call to bss_ref_get */
|
|
if (tmp->pub.transmitted_bss) {
|
|
struct cfg80211_internal_bss *pbss =
|
|
container_of(tmp->pub.transmitted_bss,
|
|
struct cfg80211_internal_bss,
|
|
pub);
|
|
|
|
new->pub.transmitted_bss = tmp->pub.transmitted_bss;
|
|
bss_ref_get(rdev, pbss);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
|
|
enum nl80211_band band,
|
|
enum cfg80211_bss_frame_type ftype)
|
|
{
|
|
const struct element *tmp;
|
|
|
|
if (band == NL80211_BAND_6GHZ) {
|
|
struct ieee80211_he_operation *he_oper;
|
|
|
|
tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
|
|
ielen);
|
|
if (tmp && tmp->datalen >= sizeof(*he_oper) &&
|
|
tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
|
|
const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
|
|
|
|
he_oper = (void *)&tmp->data[1];
|
|
|
|
he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
|
|
if (!he_6ghz_oper)
|
|
return -1;
|
|
|
|
if (ftype != CFG80211_BSS_FTYPE_BEACON ||
|
|
he_6ghz_oper->control & IEEE80211_HE_6GHZ_OPER_CTRL_DUP_BEACON)
|
|
return he_6ghz_oper->primary;
|
|
}
|
|
} else if (band == NL80211_BAND_S1GHZ) {
|
|
tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
|
|
if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
|
|
struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
|
|
|
|
return s1gop->oper_ch;
|
|
}
|
|
} else {
|
|
tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
|
|
if (tmp && tmp->datalen == 1)
|
|
return tmp->data[0];
|
|
|
|
tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
|
|
if (tmp &&
|
|
tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
|
|
struct ieee80211_ht_operation *htop = (void *)tmp->data;
|
|
|
|
return htop->primary_chan;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
|
|
|
|
/*
|
|
* 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, or if the AP reports a different primary channel.
|
|
*/
|
|
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,
|
|
enum cfg80211_bss_frame_type ftype)
|
|
{
|
|
u32 freq;
|
|
int channel_number;
|
|
struct ieee80211_channel *alt_channel;
|
|
|
|
channel_number = cfg80211_get_ies_channel_number(ie, ielen,
|
|
channel->band, ftype);
|
|
|
|
if (channel_number < 0) {
|
|
/* No channel information in frame payload */
|
|
return channel;
|
|
}
|
|
|
|
freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
|
|
|
|
/*
|
|
* In 6GHz, duplicated beacon indication is relevant for
|
|
* beacons only.
|
|
*/
|
|
if (channel->band == NL80211_BAND_6GHZ &&
|
|
(freq == channel->center_freq ||
|
|
abs(freq - channel->center_freq) > 80))
|
|
return channel;
|
|
|
|
alt_channel = ieee80211_get_channel_khz(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. */
|
|
static struct cfg80211_bss *
|
|
cfg80211_inform_single_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,
|
|
struct cfg80211_non_tx_bss *non_tx_data,
|
|
gfp_t gfp)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
struct cfg80211_bss_ies *ies;
|
|
struct ieee80211_channel *channel;
|
|
struct cfg80211_internal_bss tmp = {}, *res;
|
|
int bss_type;
|
|
bool signal_valid;
|
|
unsigned long ts;
|
|
|
|
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, ftype);
|
|
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;
|
|
tmp.parent_tsf = data->parent_tsf;
|
|
ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
|
|
|
|
if (non_tx_data) {
|
|
tmp.pub.transmitted_bss = non_tx_data->tx_bss;
|
|
ts = bss_from_pub(non_tx_data->tx_bss)->ts;
|
|
tmp.pub.bssid_index = non_tx_data->bssid_index;
|
|
tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
|
|
} else {
|
|
ts = jiffies;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
fallthrough;
|
|
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 = data->chan == channel;
|
|
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
|
|
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);
|
|
}
|
|
|
|
if (non_tx_data) {
|
|
/* this is a nontransmitting bss, we need to add it to
|
|
* transmitting bss' list if it is not there
|
|
*/
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
|
|
&res->pub)) {
|
|
if (__cfg80211_unlink_bss(rdev, res)) {
|
|
rdev->bss_generation++;
|
|
res = NULL;
|
|
}
|
|
}
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
|
|
if (!res)
|
|
return NULL;
|
|
}
|
|
|
|
trace_cfg80211_return_bss(&res->pub);
|
|
/* cfg80211_bss_update gives us a referenced result */
|
|
return &res->pub;
|
|
}
|
|
|
|
static const struct element
|
|
*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
|
|
const struct element *mbssid_elem,
|
|
const struct element *sub_elem)
|
|
{
|
|
const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
|
|
const struct element *next_mbssid;
|
|
const struct element *next_sub;
|
|
|
|
next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
|
|
mbssid_end,
|
|
ielen - (mbssid_end - ie));
|
|
|
|
/*
|
|
* If it is not the last subelement in current MBSSID IE or there isn't
|
|
* a next MBSSID IE - profile is complete.
|
|
*/
|
|
if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
|
|
!next_mbssid)
|
|
return NULL;
|
|
|
|
/* For any length error, just return NULL */
|
|
|
|
if (next_mbssid->datalen < 4)
|
|
return NULL;
|
|
|
|
next_sub = (void *)&next_mbssid->data[1];
|
|
|
|
if (next_mbssid->data + next_mbssid->datalen <
|
|
next_sub->data + next_sub->datalen)
|
|
return NULL;
|
|
|
|
if (next_sub->id != 0 || next_sub->datalen < 2)
|
|
return NULL;
|
|
|
|
/*
|
|
* Check if the first element in the next sub element is a start
|
|
* of a new profile
|
|
*/
|
|
return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
|
|
NULL : next_mbssid;
|
|
}
|
|
|
|
size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
|
|
const struct element *mbssid_elem,
|
|
const struct element *sub_elem,
|
|
u8 *merged_ie, size_t max_copy_len)
|
|
{
|
|
size_t copied_len = sub_elem->datalen;
|
|
const struct element *next_mbssid;
|
|
|
|
if (sub_elem->datalen > max_copy_len)
|
|
return 0;
|
|
|
|
memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
|
|
|
|
while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
|
|
mbssid_elem,
|
|
sub_elem))) {
|
|
const struct element *next_sub = (void *)&next_mbssid->data[1];
|
|
|
|
if (copied_len + next_sub->datalen > max_copy_len)
|
|
break;
|
|
memcpy(merged_ie + copied_len, next_sub->data,
|
|
next_sub->datalen);
|
|
copied_len += next_sub->datalen;
|
|
}
|
|
|
|
return copied_len;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_merge_profile);
|
|
|
|
static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
|
|
struct cfg80211_inform_bss *data,
|
|
enum cfg80211_bss_frame_type ftype,
|
|
const u8 *bssid, u64 tsf,
|
|
u16 beacon_interval, const u8 *ie,
|
|
size_t ielen,
|
|
struct cfg80211_non_tx_bss *non_tx_data,
|
|
gfp_t gfp)
|
|
{
|
|
const u8 *mbssid_index_ie;
|
|
const struct element *elem, *sub;
|
|
size_t new_ie_len;
|
|
u8 new_bssid[ETH_ALEN];
|
|
u8 *new_ie, *profile;
|
|
u64 seen_indices = 0;
|
|
u16 capability;
|
|
struct cfg80211_bss *bss;
|
|
|
|
if (!non_tx_data)
|
|
return;
|
|
if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
|
|
return;
|
|
if (!wiphy->support_mbssid)
|
|
return;
|
|
if (wiphy->support_only_he_mbssid &&
|
|
!cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
|
|
return;
|
|
|
|
new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
|
|
if (!new_ie)
|
|
return;
|
|
|
|
profile = kmalloc(ielen, gfp);
|
|
if (!profile)
|
|
goto out;
|
|
|
|
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
|
|
if (elem->datalen < 4)
|
|
continue;
|
|
if (elem->data[0] < 1 || (int)elem->data[0] > 8)
|
|
continue;
|
|
for_each_element(sub, elem->data + 1, elem->datalen - 1) {
|
|
u8 profile_len;
|
|
|
|
if (sub->id != 0 || sub->datalen < 4) {
|
|
/* not a valid BSS profile */
|
|
continue;
|
|
}
|
|
|
|
if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
|
|
sub->data[1] != 2) {
|
|
/* The first element within the Nontransmitted
|
|
* BSSID Profile is not the Nontransmitted
|
|
* BSSID Capability element.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
memset(profile, 0, ielen);
|
|
profile_len = cfg80211_merge_profile(ie, ielen,
|
|
elem,
|
|
sub,
|
|
profile,
|
|
ielen);
|
|
|
|
/* found a Nontransmitted BSSID Profile */
|
|
mbssid_index_ie = cfg80211_find_ie
|
|
(WLAN_EID_MULTI_BSSID_IDX,
|
|
profile, profile_len);
|
|
if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
|
|
mbssid_index_ie[2] == 0 ||
|
|
mbssid_index_ie[2] > 46) {
|
|
/* No valid Multiple BSSID-Index element */
|
|
continue;
|
|
}
|
|
|
|
if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
|
|
/* We don't support legacy split of a profile */
|
|
net_dbg_ratelimited("Partial info for BSSID index %d\n",
|
|
mbssid_index_ie[2]);
|
|
|
|
seen_indices |= BIT_ULL(mbssid_index_ie[2]);
|
|
|
|
non_tx_data->bssid_index = mbssid_index_ie[2];
|
|
non_tx_data->max_bssid_indicator = elem->data[0];
|
|
|
|
cfg80211_gen_new_bssid(bssid,
|
|
non_tx_data->max_bssid_indicator,
|
|
non_tx_data->bssid_index,
|
|
new_bssid);
|
|
memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
|
|
new_ie_len = cfg80211_gen_new_ie(ie, ielen,
|
|
profile,
|
|
profile_len, new_ie,
|
|
IEEE80211_MAX_DATA_LEN);
|
|
if (!new_ie_len)
|
|
continue;
|
|
|
|
capability = get_unaligned_le16(profile + 2);
|
|
bss = cfg80211_inform_single_bss_data(wiphy, data,
|
|
ftype,
|
|
new_bssid, tsf,
|
|
capability,
|
|
beacon_interval,
|
|
new_ie,
|
|
new_ie_len,
|
|
non_tx_data,
|
|
gfp);
|
|
if (!bss)
|
|
break;
|
|
cfg80211_put_bss(wiphy, bss);
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(new_ie);
|
|
kfree(profile);
|
|
}
|
|
|
|
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 *res;
|
|
struct cfg80211_non_tx_bss non_tx_data;
|
|
|
|
res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
|
|
capability, beacon_interval, ie,
|
|
ielen, NULL, gfp);
|
|
if (!res)
|
|
return NULL;
|
|
non_tx_data.tx_bss = res;
|
|
cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
|
|
beacon_interval, ie, ielen, &non_tx_data,
|
|
gfp);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_inform_bss_data);
|
|
|
|
/* cfg80211_inform_bss_width_frame helper */
|
|
static struct cfg80211_bss *
|
|
cfg80211_inform_single_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;
|
|
struct ieee80211_ext *ext = NULL;
|
|
u8 *bssid, *variable;
|
|
u16 capability, beacon_int;
|
|
size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
int bss_type;
|
|
enum cfg80211_bss_frame_type ftype;
|
|
|
|
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 (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
|
|
ext = (void *) mgmt;
|
|
min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
|
|
if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
|
|
min_hdr_len = offsetof(struct ieee80211_ext,
|
|
u.s1g_short_beacon.variable);
|
|
}
|
|
|
|
if (WARN_ON(len < min_hdr_len))
|
|
return NULL;
|
|
|
|
ielen = len - min_hdr_len;
|
|
variable = mgmt->u.probe_resp.variable;
|
|
if (ext) {
|
|
if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
|
|
variable = ext->u.s1g_short_beacon.variable;
|
|
else
|
|
variable = ext->u.s1g_beacon.variable;
|
|
}
|
|
|
|
if (ieee80211_is_beacon(mgmt->frame_control))
|
|
ftype = CFG80211_BSS_FTYPE_BEACON;
|
|
else if (ieee80211_is_probe_resp(mgmt->frame_control))
|
|
ftype = CFG80211_BSS_FTYPE_PRESP;
|
|
else
|
|
ftype = CFG80211_BSS_FTYPE_UNKNOWN;
|
|
|
|
channel = cfg80211_get_bss_channel(wiphy, variable,
|
|
ielen, data->chan, data->scan_width,
|
|
ftype);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
if (ext) {
|
|
const struct ieee80211_s1g_bcn_compat_ie *compat;
|
|
const struct element *elem;
|
|
|
|
elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
|
|
variable, ielen);
|
|
if (!elem)
|
|
return NULL;
|
|
if (elem->datalen < sizeof(*compat))
|
|
return NULL;
|
|
compat = (void *)elem->data;
|
|
bssid = ext->u.s1g_beacon.sa;
|
|
capability = le16_to_cpu(compat->compat_info);
|
|
beacon_int = le16_to_cpu(compat->beacon_int);
|
|
} else {
|
|
bssid = mgmt->bssid;
|
|
beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
|
|
capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
|
|
}
|
|
|
|
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) ||
|
|
ieee80211_is_s1g_beacon(mgmt->frame_control);
|
|
memcpy(ies->data, 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, bssid, ETH_ALEN);
|
|
tmp.pub.beacon_interval = beacon_int;
|
|
tmp.pub.capability = capability;
|
|
tmp.pub.channel = channel;
|
|
tmp.pub.scan_width = data->scan_width;
|
|
tmp.pub.signal = data->signal;
|
|
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 = data->chan == channel;
|
|
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
|
|
jiffies);
|
|
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;
|
|
}
|
|
|
|
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_bss *res;
|
|
const u8 *ie = mgmt->u.probe_resp.variable;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
enum cfg80211_bss_frame_type ftype;
|
|
struct cfg80211_non_tx_bss non_tx_data = {};
|
|
|
|
res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
|
|
len, gfp);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
/* don't do any further MBSSID handling for S1G */
|
|
if (ieee80211_is_s1g_beacon(mgmt->frame_control))
|
|
return res;
|
|
|
|
ftype = ieee80211_is_beacon(mgmt->frame_control) ?
|
|
CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
|
|
non_tx_data.tx_bss = res;
|
|
|
|
/* process each non-transmitting bss */
|
|
cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
|
|
le64_to_cpu(mgmt->u.probe_resp.timestamp),
|
|
le16_to_cpu(mgmt->u.probe_resp.beacon_int),
|
|
ie, ielen, &non_tx_data, gfp);
|
|
|
|
return res;
|
|
}
|
|
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, *tmp1;
|
|
struct cfg80211_bss *nontrans_bss, *tmp;
|
|
|
|
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))
|
|
goto out;
|
|
|
|
list_for_each_entry_safe(nontrans_bss, tmp,
|
|
&pub->nontrans_list,
|
|
nontrans_list) {
|
|
tmp1 = container_of(nontrans_bss,
|
|
struct cfg80211_internal_bss, pub);
|
|
if (__cfg80211_unlink_bss(rdev, tmp1))
|
|
rdev->bss_generation++;
|
|
}
|
|
|
|
if (__cfg80211_unlink_bss(rdev, bss))
|
|
rdev->bss_generation++;
|
|
out:
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_unlink_bss);
|
|
|
|
void cfg80211_bss_iter(struct wiphy *wiphy,
|
|
struct cfg80211_chan_def *chandef,
|
|
void (*iter)(struct wiphy *wiphy,
|
|
struct cfg80211_bss *bss,
|
|
void *data),
|
|
void *iter_data)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
|
|
list_for_each_entry(bss, &rdev->bss_list, list) {
|
|
if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
|
|
false))
|
|
iter(wiphy, &bss->pub, iter_data);
|
|
}
|
|
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_bss_iter);
|
|
|
|
void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
|
|
unsigned int link_id,
|
|
struct ieee80211_channel *chan)
|
|
{
|
|
struct wiphy *wiphy = wdev->wiphy;
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
|
|
struct cfg80211_internal_bss *new = NULL;
|
|
struct cfg80211_internal_bss *bss;
|
|
struct cfg80211_bss *nontrans_bss;
|
|
struct cfg80211_bss *tmp;
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
|
|
/*
|
|
* Some APs use CSA also for bandwidth changes, i.e., without actually
|
|
* changing the control channel, so no need to update in such a case.
|
|
*/
|
|
if (cbss->pub.channel == chan)
|
|
goto done;
|
|
|
|
/* use transmitting bss */
|
|
if (cbss->pub.transmitted_bss)
|
|
cbss = container_of(cbss->pub.transmitted_bss,
|
|
struct cfg80211_internal_bss,
|
|
pub);
|
|
|
|
cbss->pub.channel = chan;
|
|
|
|
list_for_each_entry(bss, &rdev->bss_list, list) {
|
|
if (!cfg80211_bss_type_match(bss->pub.capability,
|
|
bss->pub.channel->band,
|
|
wdev->conn_bss_type))
|
|
continue;
|
|
|
|
if (bss == cbss)
|
|
continue;
|
|
|
|
if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
|
|
new = bss;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (new) {
|
|
/* to save time, update IEs for transmitting bss only */
|
|
if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
|
|
new->pub.proberesp_ies = NULL;
|
|
new->pub.beacon_ies = NULL;
|
|
}
|
|
|
|
list_for_each_entry_safe(nontrans_bss, tmp,
|
|
&new->pub.nontrans_list,
|
|
nontrans_list) {
|
|
bss = container_of(nontrans_bss,
|
|
struct cfg80211_internal_bss, pub);
|
|
if (__cfg80211_unlink_bss(rdev, bss))
|
|
rdev->bss_generation++;
|
|
}
|
|
|
|
WARN_ON(atomic_read(&new->hold));
|
|
if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
|
|
rdev->bss_generation++;
|
|
}
|
|
|
|
rb_erase(&cbss->rbn, &rdev->bss_tree);
|
|
rb_insert_bss(rdev, cbss);
|
|
rdev->bss_generation++;
|
|
|
|
list_for_each_entry_safe(nontrans_bss, tmp,
|
|
&cbss->pub.nontrans_list,
|
|
nontrans_list) {
|
|
bss = container_of(nontrans_bss,
|
|
struct cfg80211_internal_bss, pub);
|
|
bss->pub.channel = chan;
|
|
rb_erase(&bss->rbn, &rdev->bss_tree);
|
|
rb_insert_bss(rdev, bss);
|
|
rdev->bss_generation++;
|
|
}
|
|
|
|
done:
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
|
|
#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;
|
|
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)
|
|
return -EBUSY;
|
|
|
|
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)
|
|
return -ENOMEM;
|
|
|
|
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);
|
|
|
|
wiphy_lock(&rdev->wiphy);
|
|
|
|
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);
|
|
}
|
|
wiphy_unlock(&rdev->wiphy);
|
|
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
|