forked from Minki/linux
ebb3ca3b44
The seen_indices variable is u64 and in other parts of the code we assume mbssid_index_ie[2] can be up to 45, so we should use the 64-bit versions of BIT, namely, BIT_ULL(). Reported-by: Dan Carpented <dan.carpenter@oracle.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2499 lines
65 KiB
C
2499 lines
65 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) 2018-2019 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 <net/arp.h>
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#include <net/cfg80211.h>
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#include <net/cfg80211-wext.h>
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#include <net/iw_handler.h>
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#include "core.h"
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#include "nl80211.h"
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#include "wext-compat.h"
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#include "rdev-ops.h"
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/**
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* DOC: BSS tree/list structure
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*
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* At the top level, the BSS list is kept in both a list in each
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* registered device (@bss_list) as well as an RB-tree for faster
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* lookup. In the RB-tree, entries can be looked up using their
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* channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
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* for other BSSes.
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*
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* Due to the possibility of hidden SSIDs, there's a second level
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* structure, the "hidden_list" and "hidden_beacon_bss" pointer.
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* The hidden_list connects all BSSes belonging to a single AP
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* that has a hidden SSID, and connects beacon and probe response
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* entries. For a probe response entry for a hidden SSID, the
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* hidden_beacon_bss pointer points to the BSS struct holding the
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* beacon's information.
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*
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* Reference counting is done for all these references except for
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* the hidden_list, so that a beacon BSS struct that is otherwise
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* not referenced has one reference for being on the bss_list and
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* one for each probe response entry that points to it using the
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* hidden_beacon_bss pointer. When a BSS struct that has such a
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* pointer is get/put, the refcount update is also propagated to
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* the referenced struct, this ensure that it cannot get removed
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* while somebody is using the probe response version.
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*
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* Note that the hidden_beacon_bss pointer never changes, due to
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* the reference counting. Therefore, no locking is needed for
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* it.
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*
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* Also note that the hidden_beacon_bss pointer is only relevant
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* if the driver uses something other than the IEs, e.g. private
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* data stored stored in the BSS struct, since the beacon IEs are
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* also linked into the probe response struct.
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*/
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/*
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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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static void bss_free(struct cfg80211_internal_bss *bss)
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{
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struct cfg80211_bss_ies *ies;
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if (WARN_ON(atomic_read(&bss->hold)))
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return;
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ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
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if (ies && !bss->pub.hidden_beacon_bss)
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kfree_rcu(ies, rcu_head);
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ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
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if (ies)
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kfree_rcu(ies, rcu_head);
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/*
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* This happens when the module is removed, it doesn't
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* really matter any more save for completeness
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*/
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if (!list_empty(&bss->hidden_list))
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list_del(&bss->hidden_list);
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kfree(bss);
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}
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static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
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struct cfg80211_internal_bss *bss)
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{
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lockdep_assert_held(&rdev->bss_lock);
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bss->refcount++;
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if (bss->pub.hidden_beacon_bss) {
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bss = container_of(bss->pub.hidden_beacon_bss,
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struct cfg80211_internal_bss,
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pub);
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bss->refcount++;
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}
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if (bss->pub.transmitted_bss) {
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bss = container_of(bss->pub.transmitted_bss,
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struct cfg80211_internal_bss,
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pub);
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bss->refcount++;
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}
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}
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static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
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struct cfg80211_internal_bss *bss)
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{
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lockdep_assert_held(&rdev->bss_lock);
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if (bss->pub.hidden_beacon_bss) {
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struct cfg80211_internal_bss *hbss;
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hbss = container_of(bss->pub.hidden_beacon_bss,
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struct cfg80211_internal_bss,
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pub);
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hbss->refcount--;
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if (hbss->refcount == 0)
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bss_free(hbss);
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}
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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_gen_new_ie(const u8 *ie, size_t ielen,
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const u8 *subelement, size_t subie_len,
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u8 *new_ie, gfp_t gfp)
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{
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u8 *pos, *tmp;
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const u8 *tmp_old, *tmp_new;
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const struct element *non_inherit_elem;
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u8 *sub_copy;
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/* copy subelement as we need to change its content to
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* mark an ie after it is processed.
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*/
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sub_copy = kmemdup(subelement, subie_len, gfp);
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if (!sub_copy)
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return 0;
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pos = &new_ie[0];
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/* set new ssid */
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tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
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if (tmp_new) {
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memcpy(pos, tmp_new, tmp_new[1] + 2);
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pos += (tmp_new[1] + 2);
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}
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/* get non inheritance list if exists */
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non_inherit_elem =
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cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
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sub_copy, subie_len);
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/* go through IEs in ie (skip SSID) and subelement,
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* merge them into new_ie
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*/
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tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
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tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
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while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
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if (tmp_old[0] == 0) {
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tmp_old++;
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continue;
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}
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if (tmp_old[0] == WLAN_EID_EXTENSION)
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tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
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subie_len);
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else
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tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
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subie_len);
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if (!tmp) {
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const struct element *old_elem = (void *)tmp_old;
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/* ie in old ie but not in subelement */
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if (cfg80211_is_element_inherited(old_elem,
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non_inherit_elem)) {
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memcpy(pos, tmp_old, tmp_old[1] + 2);
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pos += tmp_old[1] + 2;
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}
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} else {
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/* ie in transmitting ie also in subelement,
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* copy from subelement and flag the ie in subelement
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* as copied (by setting eid field to WLAN_EID_SSID,
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* which is skipped anyway).
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* For vendor ie, compare OUI + type + subType to
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* determine if they are the same ie.
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*/
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if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
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if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
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/* same vendor ie, copy from
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* subelement
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*/
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memcpy(pos, tmp, tmp[1] + 2);
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pos += tmp[1] + 2;
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tmp[0] = WLAN_EID_SSID;
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} else {
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memcpy(pos, tmp_old, tmp_old[1] + 2);
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pos += tmp_old[1] + 2;
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}
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} else {
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/* copy ie from subelement into new ie */
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memcpy(pos, tmp, tmp[1] + 2);
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pos += tmp[1] + 2;
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tmp[0] = WLAN_EID_SSID;
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}
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}
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if (tmp_old + tmp_old[1] + 2 - ie == ielen)
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break;
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tmp_old += tmp_old[1] + 2;
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}
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/* go through subelement again to check if there is any ie not
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* copied to new ie, skip ssid, capability, bssid-index ie
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*/
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tmp_new = sub_copy;
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while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
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if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
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tmp_new[0] == WLAN_EID_SSID)) {
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memcpy(pos, tmp_new, tmp_new[1] + 2);
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pos += tmp_new[1] + 2;
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}
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if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
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break;
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tmp_new += tmp_new[1] + 2;
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}
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kfree(sub_copy);
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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 u8 *ssidie;
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if (bssid && !ether_addr_equal(a->bssid, bssid))
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return false;
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if (!ssid)
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return true;
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ies = rcu_access_pointer(a->ies);
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if (!ies)
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return false;
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ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
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if (!ssidie)
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return false;
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if (ssidie[1] != ssid_len)
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return false;
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return memcmp(ssidie + 2, ssid, ssid_len) == 0;
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}
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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 u8 *ssid;
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size_t ssid_len;
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struct cfg80211_bss *bss = NULL;
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rcu_read_lock();
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ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
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if (!ssid) {
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rcu_read_unlock();
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return -EINVAL;
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}
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ssid_len = ssid[1];
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ssid = ssid + 2;
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rcu_read_unlock();
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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, ssid_len))
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return 0;
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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)
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{
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struct cfg80211_internal_bss *bss, *oldest = NULL;
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bool ret;
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lockdep_assert_held(&rdev->bss_lock);
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list_for_each_entry(bss, &rdev->bss_list, list) {
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if (atomic_read(&bss->hold))
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continue;
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if (!list_empty(&bss->hidden_list) &&
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!bss->pub.hidden_beacon_bss)
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continue;
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if (oldest && time_before(oldest->ts, bss->ts))
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continue;
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oldest = bss;
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}
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if (WARN_ON(!oldest))
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return false;
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|
|
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/*
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* The callers make sure to increase rdev->bss_generation if anything
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* gets removed (and a new entry added), so there's no need to also do
|
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* it here.
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*/
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ret = __cfg80211_unlink_bss(rdev, oldest);
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WARN_ON(!ret);
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return ret;
|
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}
|
|
|
|
void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
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bool send_message)
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|
{
|
|
struct cfg80211_scan_request *request;
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|
struct wireless_dev *wdev;
|
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struct sk_buff *msg;
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|
#ifdef CONFIG_CFG80211_WEXT
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union iwreq_data wrqu;
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#endif
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|
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ASSERT_RTNL();
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|
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if (rdev->scan_msg) {
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nl80211_send_scan_msg(rdev, rdev->scan_msg);
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rdev->scan_msg = NULL;
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return;
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}
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request = rdev->scan_req;
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if (!request)
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return;
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|
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wdev = request->wdev;
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|
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/*
|
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* This must be before sending the other events!
|
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* Otherwise, wpa_supplicant gets completely confused with
|
|
* wext events.
|
|
*/
|
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if (wdev->netdev)
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cfg80211_sme_scan_done(wdev->netdev);
|
|
|
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if (!request->info.aborted &&
|
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request->flags & NL80211_SCAN_FLAG_FLUSH) {
|
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/* flush entries from previous scans */
|
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spin_lock_bh(&rdev->bss_lock);
|
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__cfg80211_bss_expire(rdev, request->scan_start);
|
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spin_unlock_bh(&rdev->bss_lock);
|
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}
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|
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msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
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|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
if (wdev->netdev && !request->info.aborted) {
|
|
memset(&wrqu, 0, sizeof(wrqu));
|
|
|
|
wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
|
|
}
|
|
#endif
|
|
|
|
if (wdev->netdev)
|
|
dev_put(wdev->netdev);
|
|
|
|
rdev->scan_req = NULL;
|
|
kfree(request);
|
|
|
|
if (!send_message)
|
|
rdev->scan_msg = msg;
|
|
else
|
|
nl80211_send_scan_msg(rdev, msg);
|
|
}
|
|
|
|
void __cfg80211_scan_done(struct work_struct *wk)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
|
|
rdev = container_of(wk, struct cfg80211_registered_device,
|
|
scan_done_wk);
|
|
|
|
rtnl_lock();
|
|
___cfg80211_scan_done(rdev, true);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
void cfg80211_scan_done(struct cfg80211_scan_request *request,
|
|
struct cfg80211_scan_info *info)
|
|
{
|
|
trace_cfg80211_scan_done(request, info);
|
|
WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
|
|
|
|
request->info = *info;
|
|
request->notified = true;
|
|
queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_scan_done);
|
|
|
|
void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_sched_scan_request *req)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
list_add_rcu(&req->list, &rdev->sched_scan_req_list);
|
|
}
|
|
|
|
static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_sched_scan_request *req)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
list_del_rcu(&req->list);
|
|
kfree_rcu(req, rcu_head);
|
|
}
|
|
|
|
static struct cfg80211_sched_scan_request *
|
|
cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
|
|
{
|
|
struct cfg80211_sched_scan_request *pos;
|
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
|
|
|
|
list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
|
|
if (pos->reqid == reqid)
|
|
return pos;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Determines if a scheduled scan request can be handled. When a legacy
|
|
* scheduled scan is running no other scheduled scan is allowed regardless
|
|
* whether the request is for legacy or multi-support scan. When a multi-support
|
|
* scheduled scan is running a request for legacy scan is not allowed. In this
|
|
* case a request for multi-support scan can be handled if resources are
|
|
* available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
|
|
*/
|
|
int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
|
|
bool want_multi)
|
|
{
|
|
struct cfg80211_sched_scan_request *pos;
|
|
int i = 0;
|
|
|
|
list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
|
|
/* request id zero means legacy in progress */
|
|
if (!i && !pos->reqid)
|
|
return -EINPROGRESS;
|
|
i++;
|
|
}
|
|
|
|
if (i) {
|
|
/* no legacy allowed when multi request(s) are active */
|
|
if (!want_multi)
|
|
return -EINPROGRESS;
|
|
|
|
/* resource limit reached */
|
|
if (i == rdev->wiphy.max_sched_scan_reqs)
|
|
return -ENOSPC;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void cfg80211_sched_scan_results_wk(struct work_struct *work)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct cfg80211_sched_scan_request *req, *tmp;
|
|
|
|
rdev = container_of(work, struct cfg80211_registered_device,
|
|
sched_scan_res_wk);
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
|
|
if (req->report_results) {
|
|
req->report_results = false;
|
|
if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
|
|
/* flush entries from previous scans */
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
__cfg80211_bss_expire(rdev, req->scan_start);
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
req->scan_start = jiffies;
|
|
}
|
|
nl80211_send_sched_scan(req,
|
|
NL80211_CMD_SCHED_SCAN_RESULTS);
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
struct cfg80211_sched_scan_request *request;
|
|
|
|
trace_cfg80211_sched_scan_results(wiphy, reqid);
|
|
/* ignore if we're not scanning */
|
|
|
|
rcu_read_lock();
|
|
request = cfg80211_find_sched_scan_req(rdev, reqid);
|
|
if (request) {
|
|
request->report_results = true;
|
|
queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_sched_scan_results);
|
|
|
|
void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
trace_cfg80211_sched_scan_stopped(wiphy, reqid);
|
|
|
|
__cfg80211_stop_sched_scan(rdev, reqid, true);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
|
|
|
|
void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
|
|
{
|
|
rtnl_lock();
|
|
cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
|
|
|
|
int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_sched_scan_request *req,
|
|
bool driver_initiated)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (!driver_initiated) {
|
|
int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
|
|
|
|
cfg80211_del_sched_scan_req(rdev, req);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
|
|
u64 reqid, bool driver_initiated)
|
|
{
|
|
struct cfg80211_sched_scan_request *sched_scan_req;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
|
|
if (!sched_scan_req)
|
|
return -ENOENT;
|
|
|
|
return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
|
|
driver_initiated);
|
|
}
|
|
|
|
void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
|
|
unsigned long age_secs)
|
|
{
|
|
struct cfg80211_internal_bss *bss;
|
|
unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
list_for_each_entry(bss, &rdev->bss_list, list)
|
|
bss->ts -= age_jiffies;
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
}
|
|
|
|
void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
|
|
{
|
|
__cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
|
|
}
|
|
|
|
const 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;
|
|
};
|
|
|
|
/* Returned bss is reference counted and must be cleaned up appropriately. */
|
|
static struct cfg80211_internal_bss *
|
|
cfg80211_bss_update(struct cfg80211_registered_device *rdev,
|
|
struct cfg80211_internal_bss *tmp,
|
|
bool signal_valid)
|
|
{
|
|
struct cfg80211_internal_bss *found = NULL;
|
|
|
|
if (WARN_ON(!tmp->pub.channel))
|
|
return NULL;
|
|
|
|
tmp->ts = jiffies;
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
|
|
if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
return NULL;
|
|
}
|
|
|
|
found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
|
|
|
|
if (found) {
|
|
/* Update IEs */
|
|
if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
|
|
const struct cfg80211_bss_ies *old;
|
|
|
|
old = rcu_access_pointer(found->pub.proberesp_ies);
|
|
|
|
rcu_assign_pointer(found->pub.proberesp_ies,
|
|
tmp->pub.proberesp_ies);
|
|
/* Override possible earlier Beacon frame IEs */
|
|
rcu_assign_pointer(found->pub.ies,
|
|
tmp->pub.proberesp_ies);
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old,
|
|
rcu_head);
|
|
} else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
|
|
const struct cfg80211_bss_ies *old;
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
if (found->pub.hidden_beacon_bss &&
|
|
!list_empty(&found->hidden_list)) {
|
|
const struct cfg80211_bss_ies *f;
|
|
|
|
/*
|
|
* The found BSS struct is one of the probe
|
|
* response members of a group, but we're
|
|
* receiving a beacon (beacon_ies in the tmp
|
|
* bss is used). This can only mean that the
|
|
* AP changed its beacon from not having an
|
|
* SSID to showing it, which is confusing so
|
|
* drop this information.
|
|
*/
|
|
|
|
f = rcu_access_pointer(tmp->pub.beacon_ies);
|
|
kfree_rcu((struct cfg80211_bss_ies *)f,
|
|
rcu_head);
|
|
goto drop;
|
|
}
|
|
|
|
old = rcu_access_pointer(found->pub.beacon_ies);
|
|
|
|
rcu_assign_pointer(found->pub.beacon_ies,
|
|
tmp->pub.beacon_ies);
|
|
|
|
/* Override IEs if they were from a beacon before */
|
|
if (old == rcu_access_pointer(found->pub.ies))
|
|
rcu_assign_pointer(found->pub.ies,
|
|
tmp->pub.beacon_ies);
|
|
|
|
/* Assign beacon IEs to all sub entries */
|
|
list_for_each_entry(bss, &found->hidden_list,
|
|
hidden_list) {
|
|
const struct cfg80211_bss_ies *ies;
|
|
|
|
ies = rcu_access_pointer(bss->pub.beacon_ies);
|
|
WARN_ON(ies != old);
|
|
|
|
rcu_assign_pointer(bss->pub.beacon_ies,
|
|
tmp->pub.beacon_ies);
|
|
}
|
|
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old,
|
|
rcu_head);
|
|
}
|
|
|
|
found->pub.beacon_interval = tmp->pub.beacon_interval;
|
|
/*
|
|
* don't update the signal if beacon was heard on
|
|
* adjacent channel.
|
|
*/
|
|
if (signal_valid)
|
|
found->pub.signal = tmp->pub.signal;
|
|
found->pub.capability = tmp->pub.capability;
|
|
found->ts = tmp->ts;
|
|
found->ts_boottime = tmp->ts_boottime;
|
|
found->parent_tsf = tmp->parent_tsf;
|
|
found->pub.chains = tmp->pub.chains;
|
|
memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
|
|
IEEE80211_MAX_CHAINS);
|
|
ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
|
|
found->pub.max_bssid_indicator = tmp->pub.max_bssid_indicator;
|
|
found->pub.bssid_index = tmp->pub.bssid_index;
|
|
} 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);
|
|
|
|
if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
|
|
hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
|
|
if (!hidden)
|
|
hidden = rb_find_bss(rdev, tmp,
|
|
BSS_CMP_HIDE_NUL);
|
|
if (hidden) {
|
|
new->pub.hidden_beacon_bss = &hidden->pub;
|
|
list_add(&new->hidden_list,
|
|
&hidden->hidden_list);
|
|
hidden->refcount++;
|
|
rcu_assign_pointer(new->pub.beacon_ies,
|
|
hidden->pub.beacon_ies);
|
|
}
|
|
} else {
|
|
/*
|
|
* Ok so we found a beacon, and don't have an entry. If
|
|
* it's a beacon with hidden SSID, we might be in for an
|
|
* expensive search for any probe responses that should
|
|
* be grouped with this beacon for updates ...
|
|
*/
|
|
if (!cfg80211_combine_bsses(rdev, new)) {
|
|
kfree(new);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (rdev->bss_entries >= bss_entries_limit &&
|
|
!cfg80211_bss_expire_oldest(rdev)) {
|
|
kfree(new);
|
|
goto drop;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* Update RX channel information based on the available frame payload
|
|
* information. This is mainly for the 2.4 GHz band where frames can be received
|
|
* from neighboring channels and the Beacon frames use the DSSS Parameter Set
|
|
* element to indicate the current (transmitting) channel, but this might also
|
|
* be needed on other bands if RX frequency does not match with the actual
|
|
* operating channel of a BSS.
|
|
*/
|
|
static struct ieee80211_channel *
|
|
cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
|
|
struct ieee80211_channel *channel,
|
|
enum nl80211_bss_scan_width scan_width)
|
|
{
|
|
const u8 *tmp;
|
|
u32 freq;
|
|
int channel_number = -1;
|
|
struct ieee80211_channel *alt_channel;
|
|
|
|
tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
|
|
if (tmp && tmp[1] == 1) {
|
|
channel_number = tmp[2];
|
|
} else {
|
|
tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
|
|
if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
|
|
struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
|
|
|
|
channel_number = htop->primary_chan;
|
|
}
|
|
}
|
|
|
|
if (channel_number < 0) {
|
|
/* No channel information in frame payload */
|
|
return channel;
|
|
}
|
|
|
|
freq = ieee80211_channel_to_frequency(channel_number, channel->band);
|
|
alt_channel = ieee80211_get_channel(wiphy, freq);
|
|
if (!alt_channel) {
|
|
if (channel->band == NL80211_BAND_2GHZ) {
|
|
/*
|
|
* Better not allow unexpected channels when that could
|
|
* be going beyond the 1-11 range (e.g., discovering
|
|
* BSS on channel 12 when radio is configured for
|
|
* channel 11.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
/* No match for the payload channel number - ignore it */
|
|
return channel;
|
|
}
|
|
|
|
if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
|
|
scan_width == NL80211_BSS_CHAN_WIDTH_5) {
|
|
/*
|
|
* Ignore channel number in 5 and 10 MHz channels where there
|
|
* may not be an n:1 or 1:n mapping between frequencies and
|
|
* channel numbers.
|
|
*/
|
|
return channel;
|
|
}
|
|
|
|
/*
|
|
* Use the channel determined through the payload channel number
|
|
* instead of the RX channel reported by the driver.
|
|
*/
|
|
if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
|
|
return NULL;
|
|
return alt_channel;
|
|
}
|
|
|
|
/* Returned bss is reference counted and must be cleaned up appropriately. */
|
|
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;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(data->signal < 0 || data->signal > 100)))
|
|
return NULL;
|
|
|
|
channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
|
|
data->scan_width);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
|
|
tmp.pub.channel = channel;
|
|
tmp.pub.scan_width = data->scan_width;
|
|
tmp.pub.signal = data->signal;
|
|
tmp.pub.beacon_interval = beacon_interval;
|
|
tmp.pub.capability = capability;
|
|
tmp.ts_boottime = data->boottime_ns;
|
|
if (non_tx_data) {
|
|
tmp.pub.transmitted_bss = non_tx_data->tx_bss;
|
|
tmp.pub.bssid_index = non_tx_data->bssid_index;
|
|
tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
|
|
}
|
|
|
|
/*
|
|
* If we do not know here whether the IEs are from a Beacon or Probe
|
|
* Response frame, we need to pick one of the options and only use it
|
|
* with the driver that does not provide the full Beacon/Probe Response
|
|
* frame. Use Beacon frame pointer to avoid indicating that this should
|
|
* override the IEs pointer should we have received an earlier
|
|
* indication of Probe Response data.
|
|
*/
|
|
ies = kzalloc(sizeof(*ies) + ielen, gfp);
|
|
if (!ies)
|
|
return NULL;
|
|
ies->len = ielen;
|
|
ies->tsf = tsf;
|
|
ies->from_beacon = false;
|
|
memcpy(ies->data, ie, ielen);
|
|
|
|
switch (ftype) {
|
|
case CFG80211_BSS_FTYPE_BEACON:
|
|
ies->from_beacon = true;
|
|
/* fall through */
|
|
case CFG80211_BSS_FTYPE_UNKNOWN:
|
|
rcu_assign_pointer(tmp.pub.beacon_ies, ies);
|
|
break;
|
|
case CFG80211_BSS_FTYPE_PRESP:
|
|
rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
|
|
break;
|
|
}
|
|
rcu_assign_pointer(tmp.pub.ies, ies);
|
|
|
|
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
|
|
wiphy->max_adj_channel_rssi_comp;
|
|
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
if (channel->band == NL80211_BAND_60GHZ) {
|
|
bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
|
|
if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
|
|
bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
} else {
|
|
if (res->pub.capability & WLAN_CAPABILITY_ESS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
}
|
|
|
|
if (non_tx_data && non_tx_data->tx_bss) {
|
|
/* this is a nontransmitting bss, we need to add it to
|
|
* transmitting bss' list if it is not there
|
|
*/
|
|
if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
|
|
&res->pub)) {
|
|
if (__cfg80211_unlink_bss(rdev, res))
|
|
rdev->bss_generation++;
|
|
}
|
|
}
|
|
|
|
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 is 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_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
|
|
return;
|
|
if (!wiphy->support_mbssid)
|
|
return;
|
|
if (wiphy->support_only_he_mbssid &&
|
|
!cfg80211_find_ext_ie(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;
|
|
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,
|
|
gfp);
|
|
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);
|
|
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);
|
|
|
|
static void
|
|
cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
|
|
struct cfg80211_inform_bss *data,
|
|
struct ieee80211_mgmt *mgmt, size_t len,
|
|
struct cfg80211_non_tx_bss *non_tx_data,
|
|
gfp_t gfp)
|
|
{
|
|
enum cfg80211_bss_frame_type ftype;
|
|
const u8 *ie = mgmt->u.probe_resp.variable;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
|
|
ftype = ieee80211_is_beacon(mgmt->frame_control) ?
|
|
CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
|
|
|
|
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);
|
|
}
|
|
|
|
static void
|
|
cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
|
|
struct cfg80211_bss *nontrans_bss,
|
|
struct ieee80211_mgmt *mgmt, size_t len,
|
|
gfp_t gfp)
|
|
{
|
|
u8 *ie, *new_ie, *pos;
|
|
const u8 *nontrans_ssid, *trans_ssid, *mbssid;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
size_t new_ie_len;
|
|
struct cfg80211_bss_ies *new_ies;
|
|
const struct cfg80211_bss_ies *old;
|
|
u8 cpy_len;
|
|
|
|
ie = mgmt->u.probe_resp.variable;
|
|
|
|
new_ie_len = ielen;
|
|
trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
|
|
if (!trans_ssid)
|
|
return;
|
|
new_ie_len -= trans_ssid[1];
|
|
mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
|
|
if (!mbssid)
|
|
return;
|
|
new_ie_len -= mbssid[1];
|
|
rcu_read_lock();
|
|
nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
|
|
if (!nontrans_ssid) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
new_ie_len += nontrans_ssid[1];
|
|
rcu_read_unlock();
|
|
|
|
/* generate new ie for nontrans BSS
|
|
* 1. replace SSID with nontrans BSS' SSID
|
|
* 2. skip MBSSID IE
|
|
*/
|
|
new_ie = kzalloc(new_ie_len, gfp);
|
|
if (!new_ie)
|
|
return;
|
|
new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
|
|
if (!new_ies)
|
|
goto out_free;
|
|
|
|
pos = new_ie;
|
|
|
|
/* copy the nontransmitted SSID */
|
|
cpy_len = nontrans_ssid[1] + 2;
|
|
memcpy(pos, nontrans_ssid, cpy_len);
|
|
pos += cpy_len;
|
|
/* copy the IEs between SSID and MBSSID */
|
|
cpy_len = trans_ssid[1] + 2;
|
|
memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
|
|
pos += (mbssid - (trans_ssid + cpy_len));
|
|
/* copy the IEs after MBSSID */
|
|
cpy_len = mbssid[1] + 2;
|
|
memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
|
|
|
|
/* update ie */
|
|
new_ies->len = new_ie_len;
|
|
new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
|
|
new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
|
|
memcpy(new_ies->data, new_ie, new_ie_len);
|
|
if (ieee80211_is_probe_resp(mgmt->frame_control)) {
|
|
old = rcu_access_pointer(nontrans_bss->proberesp_ies);
|
|
rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
|
|
rcu_assign_pointer(nontrans_bss->ies, new_ies);
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
|
|
} else {
|
|
old = rcu_access_pointer(nontrans_bss->beacon_ies);
|
|
rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
|
|
rcu_assign_pointer(nontrans_bss->ies, new_ies);
|
|
if (old)
|
|
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
|
|
}
|
|
|
|
out_free:
|
|
kfree(new_ie);
|
|
}
|
|
|
|
/* 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,
|
|
struct cfg80211_non_tx_bss *non_tx_data,
|
|
gfp_t gfp)
|
|
{
|
|
struct cfg80211_internal_bss tmp = {}, *res;
|
|
struct cfg80211_bss_ies *ies;
|
|
struct ieee80211_channel *channel;
|
|
bool signal_valid;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
int bss_type;
|
|
|
|
BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
|
|
offsetof(struct ieee80211_mgmt, u.beacon.variable));
|
|
|
|
trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
|
|
|
|
if (WARN_ON(!mgmt))
|
|
return NULL;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(data->signal < 0 || data->signal > 100)))
|
|
return NULL;
|
|
|
|
if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
|
|
return NULL;
|
|
|
|
channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
|
|
ielen, data->chan, data->scan_width);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
ies = kzalloc(sizeof(*ies) + ielen, gfp);
|
|
if (!ies)
|
|
return NULL;
|
|
ies->len = ielen;
|
|
ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
|
|
ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
|
|
memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
|
|
|
|
if (ieee80211_is_probe_resp(mgmt->frame_control))
|
|
rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
|
|
else
|
|
rcu_assign_pointer(tmp.pub.beacon_ies, ies);
|
|
rcu_assign_pointer(tmp.pub.ies, ies);
|
|
|
|
memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
|
|
tmp.pub.channel = channel;
|
|
tmp.pub.scan_width = data->scan_width;
|
|
tmp.pub.signal = data->signal;
|
|
tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
|
|
tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
|
|
tmp.ts_boottime = data->boottime_ns;
|
|
tmp.parent_tsf = data->parent_tsf;
|
|
tmp.pub.chains = data->chains;
|
|
memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
|
|
ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
|
|
if (non_tx_data) {
|
|
tmp.pub.transmitted_bss = non_tx_data->tx_bss;
|
|
tmp.pub.bssid_index = non_tx_data->bssid_index;
|
|
tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
|
|
}
|
|
|
|
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
|
|
wiphy->max_adj_channel_rssi_comp;
|
|
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
if (channel->band == NL80211_BAND_60GHZ) {
|
|
bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
|
|
if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
|
|
bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
} else {
|
|
if (res->pub.capability & WLAN_CAPABILITY_ESS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
}
|
|
|
|
trace_cfg80211_return_bss(&res->pub);
|
|
/* cfg80211_bss_update gives us a referenced result */
|
|
return &res->pub;
|
|
}
|
|
|
|
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, *tmp_bss;
|
|
const u8 *ie = mgmt->u.probe_resp.variable;
|
|
const struct cfg80211_bss_ies *ies1, *ies2;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
struct cfg80211_non_tx_bss non_tx_data;
|
|
|
|
res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
|
|
len, NULL, gfp);
|
|
if (!res || !wiphy->support_mbssid ||
|
|
!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
|
|
return res;
|
|
if (wiphy->support_only_he_mbssid &&
|
|
!cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
|
|
return res;
|
|
|
|
non_tx_data.tx_bss = res;
|
|
/* process each non-transmitting bss */
|
|
cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
|
|
&non_tx_data, gfp);
|
|
|
|
/* check if the res has other nontransmitting bss which is not
|
|
* in MBSSID IE
|
|
*/
|
|
ies1 = rcu_access_pointer(res->ies);
|
|
|
|
/* go through nontrans_list, if the timestamp of the BSS is
|
|
* earlier than the timestamp of the transmitting BSS then
|
|
* update it
|
|
*/
|
|
list_for_each_entry(tmp_bss, &res->nontrans_list,
|
|
nontrans_list) {
|
|
ies2 = rcu_access_pointer(tmp_bss->ies);
|
|
if (ies2->tsf < ies1->tsf)
|
|
cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
|
|
mgmt, len, 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);
|
|
|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
static struct cfg80211_registered_device *
|
|
cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
dev = dev_get_by_index(net, ifindex);
|
|
if (!dev)
|
|
return ERR_PTR(-ENODEV);
|
|
if (dev->ieee80211_ptr)
|
|
rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
|
|
else
|
|
rdev = ERR_PTR(-ENODEV);
|
|
dev_put(dev);
|
|
return rdev;
|
|
}
|
|
|
|
int cfg80211_wext_siwscan(struct net_device *dev,
|
|
struct iw_request_info *info,
|
|
union iwreq_data *wrqu, char *extra)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct wiphy *wiphy;
|
|
struct iw_scan_req *wreq = NULL;
|
|
struct cfg80211_scan_request *creq = NULL;
|
|
int i, err, n_channels = 0;
|
|
enum nl80211_band band;
|
|
|
|
if (!netif_running(dev))
|
|
return -ENETDOWN;
|
|
|
|
if (wrqu->data.length == sizeof(struct iw_scan_req))
|
|
wreq = (struct iw_scan_req *)extra;
|
|
|
|
rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
|
|
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
|
|
if (rdev->scan_req || rdev->scan_msg) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
wiphy = &rdev->wiphy;
|
|
|
|
/* Determine number of channels, needed to allocate creq */
|
|
if (wreq && wreq->num_channels)
|
|
n_channels = wreq->num_channels;
|
|
else
|
|
n_channels = ieee80211_get_num_supported_channels(wiphy);
|
|
|
|
creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
|
|
n_channels * sizeof(void *),
|
|
GFP_ATOMIC);
|
|
if (!creq) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
creq->wiphy = wiphy;
|
|
creq->wdev = dev->ieee80211_ptr;
|
|
/* SSIDs come after channels */
|
|
creq->ssids = (void *)&creq->channels[n_channels];
|
|
creq->n_channels = n_channels;
|
|
creq->n_ssids = 1;
|
|
creq->scan_start = jiffies;
|
|
|
|
/* translate "Scan on frequencies" request */
|
|
i = 0;
|
|
for (band = 0; band < NUM_NL80211_BANDS; band++) {
|
|
int j;
|
|
|
|
if (!wiphy->bands[band])
|
|
continue;
|
|
|
|
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
|
|
/* ignore disabled channels */
|
|
if (wiphy->bands[band]->channels[j].flags &
|
|
IEEE80211_CHAN_DISABLED)
|
|
continue;
|
|
|
|
/* If we have a wireless request structure and the
|
|
* wireless request specifies frequencies, then search
|
|
* for the matching hardware channel.
|
|
*/
|
|
if (wreq && wreq->num_channels) {
|
|
int k;
|
|
int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
|
|
for (k = 0; k < wreq->num_channels; k++) {
|
|
struct iw_freq *freq =
|
|
&wreq->channel_list[k];
|
|
int wext_freq =
|
|
cfg80211_wext_freq(freq);
|
|
|
|
if (wext_freq == wiphy_freq)
|
|
goto wext_freq_found;
|
|
}
|
|
goto wext_freq_not_found;
|
|
}
|
|
|
|
wext_freq_found:
|
|
creq->channels[i] = &wiphy->bands[band]->channels[j];
|
|
i++;
|
|
wext_freq_not_found: ;
|
|
}
|
|
}
|
|
/* No channels found? */
|
|
if (!i) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Set real number of channels specified in creq->channels[] */
|
|
creq->n_channels = i;
|
|
|
|
/* translate "Scan for SSID" request */
|
|
if (wreq) {
|
|
if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
|
|
if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
|
|
creq->ssids[0].ssid_len = wreq->essid_len;
|
|
}
|
|
if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
|
|
creq->n_ssids = 0;
|
|
}
|
|
|
|
for (i = 0; i < NUM_NL80211_BANDS; i++)
|
|
if (wiphy->bands[i])
|
|
creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
|
|
|
|
eth_broadcast_addr(creq->bssid);
|
|
|
|
rdev->scan_req = creq;
|
|
err = rdev_scan(rdev, creq);
|
|
if (err) {
|
|
rdev->scan_req = NULL;
|
|
/* creq will be freed below */
|
|
} else {
|
|
nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
|
|
/* creq now owned by driver */
|
|
creq = NULL;
|
|
dev_hold(dev);
|
|
}
|
|
out:
|
|
kfree(creq);
|
|
return err;
|
|
}
|
|
EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
|
|
|
|
static char *ieee80211_scan_add_ies(struct iw_request_info *info,
|
|
const struct cfg80211_bss_ies *ies,
|
|
char *current_ev, char *end_buf)
|
|
{
|
|
const u8 *pos, *end, *next;
|
|
struct iw_event iwe;
|
|
|
|
if (!ies)
|
|
return current_ev;
|
|
|
|
/*
|
|
* If needed, fragment the IEs buffer (at IE boundaries) into short
|
|
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
|
|
*/
|
|
pos = ies->data;
|
|
end = pos + ies->len;
|
|
|
|
while (end - pos > IW_GENERIC_IE_MAX) {
|
|
next = pos + 2 + pos[1];
|
|
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
|
|
next = next + 2 + next[1];
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = next - pos;
|
|
current_ev = iwe_stream_add_point_check(info, current_ev,
|
|
end_buf, &iwe,
|
|
(void *)pos);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
pos = next;
|
|
}
|
|
|
|
if (end > pos) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = end - pos;
|
|
current_ev = iwe_stream_add_point_check(info, current_ev,
|
|
end_buf, &iwe,
|
|
(void *)pos);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
}
|
|
|
|
return current_ev;
|
|
}
|
|
|
|
static char *
|
|
ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
|
|
struct cfg80211_internal_bss *bss, char *current_ev,
|
|
char *end_buf)
|
|
{
|
|
const struct cfg80211_bss_ies *ies;
|
|
struct iw_event iwe;
|
|
const u8 *ie;
|
|
u8 buf[50];
|
|
u8 *cfg, *p, *tmp;
|
|
int rem, i, sig;
|
|
bool ismesh = false;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWAP;
|
|
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
|
|
memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
|
|
current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
|
|
IW_EV_ADDR_LEN);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
|
|
iwe.u.freq.e = 0;
|
|
current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = bss->pub.channel->center_freq;
|
|
iwe.u.freq.e = 6;
|
|
current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
|
|
if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVQUAL;
|
|
iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
|
|
IW_QUAL_NOISE_INVALID |
|
|
IW_QUAL_QUAL_UPDATED;
|
|
switch (wiphy->signal_type) {
|
|
case CFG80211_SIGNAL_TYPE_MBM:
|
|
sig = bss->pub.signal / 100;
|
|
iwe.u.qual.level = sig;
|
|
iwe.u.qual.updated |= IW_QUAL_DBM;
|
|
if (sig < -110) /* rather bad */
|
|
sig = -110;
|
|
else if (sig > -40) /* perfect */
|
|
sig = -40;
|
|
/* will give a range of 0 .. 70 */
|
|
iwe.u.qual.qual = sig + 110;
|
|
break;
|
|
case CFG80211_SIGNAL_TYPE_UNSPEC:
|
|
iwe.u.qual.level = bss->pub.signal;
|
|
/* will give range 0 .. 100 */
|
|
iwe.u.qual.qual = bss->pub.signal;
|
|
break;
|
|
default:
|
|
/* not reached */
|
|
break;
|
|
}
|
|
current_ev = iwe_stream_add_event_check(info, current_ev,
|
|
end_buf, &iwe,
|
|
IW_EV_QUAL_LEN);
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
}
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWENCODE;
|
|
if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
|
|
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
|
|
else
|
|
iwe.u.data.flags = IW_ENCODE_DISABLED;
|
|
iwe.u.data.length = 0;
|
|
current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
|
|
&iwe, "");
|
|
if (IS_ERR(current_ev))
|
|
return current_ev;
|
|
|
|
rcu_read_lock();
|
|
ies = rcu_dereference(bss->pub.ies);
|
|
rem = ies->len;
|
|
ie = ies->data;
|
|
|
|
while (rem >= 2) {
|
|
/* invalid data */
|
|
if (ie[1] > rem - 2)
|
|
break;
|
|
|
|
switch (ie[0]) {
|
|
case WLAN_EID_SSID:
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWESSID;
|
|
iwe.u.data.length = ie[1];
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf, &iwe,
|
|
(u8 *)ie + 2);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
break;
|
|
case WLAN_EID_MESH_ID:
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWESSID;
|
|
iwe.u.data.length = ie[1];
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf, &iwe,
|
|
(u8 *)ie + 2);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
break;
|
|
case WLAN_EID_MESH_CONFIG:
|
|
ismesh = true;
|
|
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
|
|
break;
|
|
cfg = (u8 *)ie + 2;
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "Mesh Network Path Selection Protocol ID: "
|
|
"0x%02X", cfg[0]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Path Selection Metric ID: 0x%02X",
|
|
cfg[1]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Congestion Control Mode ID: 0x%02X",
|
|
cfg[2]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info,
|
|
current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
break;
|
|
case WLAN_EID_SUPP_RATES:
|
|
case WLAN_EID_EXT_SUPP_RATES:
|
|
/* display all supported rates in readable format */
|
|
p = current_ev + iwe_stream_lcp_len(info);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWRATE;
|
|
/* Those two flags are ignored... */
|
|
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
|
|
|
|
for (i = 0; i < ie[1]; i++) {
|
|
iwe.u.bitrate.value =
|
|
((ie[i + 2] & 0x7f) * 500000);
|
|
tmp = p;
|
|
p = iwe_stream_add_value(info, current_ev, p,
|
|
end_buf, &iwe,
|
|
IW_EV_PARAM_LEN);
|
|
if (p == tmp) {
|
|
current_ev = ERR_PTR(-E2BIG);
|
|
goto unlock;
|
|
}
|
|
}
|
|
current_ev = p;
|
|
break;
|
|
}
|
|
rem -= ie[1] + 2;
|
|
ie += ie[1] + 2;
|
|
}
|
|
|
|
if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
|
|
ismesh) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWMODE;
|
|
if (ismesh)
|
|
iwe.u.mode = IW_MODE_MESH;
|
|
else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
|
|
iwe.u.mode = IW_MODE_MASTER;
|
|
else
|
|
iwe.u.mode = IW_MODE_ADHOC;
|
|
current_ev = iwe_stream_add_event_check(info, current_ev,
|
|
end_buf, &iwe,
|
|
IW_EV_UINT_LEN);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
}
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
|
|
&iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, " Last beacon: %ums ago",
|
|
elapsed_jiffies_msecs(bss->ts));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point_check(info, current_ev,
|
|
end_buf, &iwe, buf);
|
|
if (IS_ERR(current_ev))
|
|
goto unlock;
|
|
|
|
current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return current_ev;
|
|
}
|
|
|
|
|
|
static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
|
|
struct iw_request_info *info,
|
|
char *buf, size_t len)
|
|
{
|
|
char *current_ev = buf;
|
|
char *end_buf = buf + len;
|
|
struct cfg80211_internal_bss *bss;
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&rdev->bss_lock);
|
|
cfg80211_bss_expire(rdev);
|
|
|
|
list_for_each_entry(bss, &rdev->bss_list, list) {
|
|
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
|
|
err = -E2BIG;
|
|
break;
|
|
}
|
|
current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
|
|
current_ev, end_buf);
|
|
if (IS_ERR(current_ev)) {
|
|
err = PTR_ERR(current_ev);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&rdev->bss_lock);
|
|
|
|
if (err)
|
|
return err;
|
|
return current_ev - buf;
|
|
}
|
|
|
|
|
|
int cfg80211_wext_giwscan(struct net_device *dev,
|
|
struct iw_request_info *info,
|
|
struct iw_point *data, char *extra)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
int res;
|
|
|
|
if (!netif_running(dev))
|
|
return -ENETDOWN;
|
|
|
|
rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
|
|
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
|
|
if (rdev->scan_req || rdev->scan_msg)
|
|
return -EAGAIN;
|
|
|
|
res = ieee80211_scan_results(rdev, info, extra, data->length);
|
|
data->length = 0;
|
|
if (res >= 0) {
|
|
data->length = res;
|
|
res = 0;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
|
|
#endif
|