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-rw-r--r--net/wireless/scan.c3637
1 files changed, 3637 insertions, 0 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
new file mode 100644
index 0000000000..bd4dd75e44
--- /dev/null
+++ b/net/wireless/scan.c
@@ -0,0 +1,3637 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cfg80211 scan result handling
+ *
+ * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright 2016 Intel Deutschland GmbH
+ * Copyright (C) 2018-2023 Intel Corporation
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/wireless.h>
+#include <linux/nl80211.h>
+#include <linux/etherdevice.h>
+#include <linux/crc32.h>
+#include <linux/bitfield.h>
+#include <net/arp.h>
+#include <net/cfg80211.h>
+#include <net/cfg80211-wext.h>
+#include <net/iw_handler.h>
+#include "core.h"
+#include "nl80211.h"
+#include "wext-compat.h"
+#include "rdev-ops.h"
+
+/**
+ * DOC: BSS tree/list structure
+ *
+ * At the top level, the BSS list is kept in both a list in each
+ * registered device (@bss_list) as well as an RB-tree for faster
+ * lookup. In the RB-tree, entries can be looked up using their
+ * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
+ * for other BSSes.
+ *
+ * Due to the possibility of hidden SSIDs, there's a second level
+ * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
+ * The hidden_list connects all BSSes belonging to a single AP
+ * that has a hidden SSID, and connects beacon and probe response
+ * entries. For a probe response entry for a hidden SSID, the
+ * hidden_beacon_bss pointer points to the BSS struct holding the
+ * beacon's information.
+ *
+ * Reference counting is done for all these references except for
+ * the hidden_list, so that a beacon BSS struct that is otherwise
+ * not referenced has one reference for being on the bss_list and
+ * one for each probe response entry that points to it using the
+ * hidden_beacon_bss pointer. When a BSS struct that has such a
+ * pointer is get/put, the refcount update is also propagated to
+ * the referenced struct, this ensure that it cannot get removed
+ * while somebody is using the probe response version.
+ *
+ * Note that the hidden_beacon_bss pointer never changes, due to
+ * the reference counting. Therefore, no locking is needed for
+ * it.
+ *
+ * Also note that the hidden_beacon_bss pointer is only relevant
+ * if the driver uses something other than the IEs, e.g. private
+ * data stored in the BSS struct, since the beacon IEs are
+ * also linked into the probe response struct.
+ */
+
+/*
+ * Limit the number of BSS entries stored in mac80211. Each one is
+ * a bit over 4k at most, so this limits to roughly 4-5M of memory.
+ * If somebody wants to really attack this though, they'd likely
+ * use small beacons, and only one type of frame, limiting each of
+ * the entries to a much smaller size (in order to generate more
+ * entries in total, so overhead is bigger.)
+ */
+static int bss_entries_limit = 1000;
+module_param(bss_entries_limit, int, 0644);
+MODULE_PARM_DESC(bss_entries_limit,
+ "limit to number of scan BSS entries (per wiphy, default 1000)");
+
+#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
+
+/**
+ * struct cfg80211_colocated_ap - colocated AP information
+ *
+ * @list: linked list to all colocated aPS
+ * @bssid: BSSID of the reported AP
+ * @ssid: SSID of the reported AP
+ * @ssid_len: length of the ssid
+ * @center_freq: frequency the reported AP is on
+ * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
+ * that operate in the same channel as the reported AP and that might be
+ * detected by a STA receiving this frame, are transmitting unsolicited
+ * Probe Response frames every 20 TUs
+ * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
+ * @same_ssid: the reported AP has the same SSID as the reporting AP
+ * @multi_bss: the reported AP is part of a multiple BSSID set
+ * @transmitted_bssid: the reported AP is the transmitting BSSID
+ * @colocated_ess: all the APs that share the same ESS as the reported AP are
+ * colocated and can be discovered via legacy bands.
+ * @short_ssid_valid: short_ssid is valid and can be used
+ * @short_ssid: the short SSID for this SSID
+ * @psd_20: The 20MHz PSD EIRP of the primary 20MHz channel for the reported AP
+ */
+struct cfg80211_colocated_ap {
+ struct list_head list;
+ u8 bssid[ETH_ALEN];
+ u8 ssid[IEEE80211_MAX_SSID_LEN];
+ size_t ssid_len;
+ u32 short_ssid;
+ u32 center_freq;
+ u8 unsolicited_probe:1,
+ oct_recommended:1,
+ same_ssid:1,
+ multi_bss:1,
+ transmitted_bssid:1,
+ colocated_ess:1,
+ short_ssid_valid:1;
+ s8 psd_20;
+};
+
+static void bss_free(struct cfg80211_internal_bss *bss)
+{
+ struct cfg80211_bss_ies *ies;
+
+ if (WARN_ON(atomic_read(&bss->hold)))
+ return;
+
+ ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
+ if (ies && !bss->pub.hidden_beacon_bss)
+ kfree_rcu(ies, rcu_head);
+ ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
+ if (ies)
+ kfree_rcu(ies, rcu_head);
+
+ /*
+ * This happens when the module is removed, it doesn't
+ * really matter any more save for completeness
+ */
+ if (!list_empty(&bss->hidden_list))
+ list_del(&bss->hidden_list);
+
+ kfree(bss);
+}
+
+static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ bss->refcount++;
+
+ if (bss->pub.hidden_beacon_bss)
+ bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
+
+ if (bss->pub.transmitted_bss)
+ bss_from_pub(bss->pub.transmitted_bss)->refcount++;
+}
+
+static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ if (bss->pub.hidden_beacon_bss) {
+ struct cfg80211_internal_bss *hbss;
+
+ hbss = bss_from_pub(bss->pub.hidden_beacon_bss);
+ hbss->refcount--;
+ if (hbss->refcount == 0)
+ bss_free(hbss);
+ }
+
+ if (bss->pub.transmitted_bss) {
+ struct cfg80211_internal_bss *tbss;
+
+ tbss = bss_from_pub(bss->pub.transmitted_bss);
+ tbss->refcount--;
+ if (tbss->refcount == 0)
+ bss_free(tbss);
+ }
+
+ bss->refcount--;
+ if (bss->refcount == 0)
+ bss_free(bss);
+}
+
+static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *bss)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ if (!list_empty(&bss->hidden_list)) {
+ /*
+ * don't remove the beacon entry if it has
+ * probe responses associated with it
+ */
+ if (!bss->pub.hidden_beacon_bss)
+ return false;
+ /*
+ * if it's a probe response entry break its
+ * link to the other entries in the group
+ */
+ list_del_init(&bss->hidden_list);
+ }
+
+ list_del_init(&bss->list);
+ list_del_init(&bss->pub.nontrans_list);
+ rb_erase(&bss->rbn, &rdev->bss_tree);
+ rdev->bss_entries--;
+ WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
+ "rdev bss entries[%d]/list[empty:%d] corruption\n",
+ rdev->bss_entries, list_empty(&rdev->bss_list));
+ bss_ref_put(rdev, bss);
+ return true;
+}
+
+bool cfg80211_is_element_inherited(const struct element *elem,
+ const struct element *non_inherit_elem)
+{
+ u8 id_len, ext_id_len, i, loop_len, id;
+ const u8 *list;
+
+ if (elem->id == WLAN_EID_MULTIPLE_BSSID)
+ return false;
+
+ if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 &&
+ elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK)
+ return false;
+
+ if (!non_inherit_elem || non_inherit_elem->datalen < 2)
+ return true;
+
+ /*
+ * non inheritance element format is:
+ * ext ID (56) | IDs list len | list | extension IDs list len | list
+ * Both lists are optional. Both lengths are mandatory.
+ * This means valid length is:
+ * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
+ */
+ id_len = non_inherit_elem->data[1];
+ if (non_inherit_elem->datalen < 3 + id_len)
+ return true;
+
+ ext_id_len = non_inherit_elem->data[2 + id_len];
+ if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
+ return true;
+
+ if (elem->id == WLAN_EID_EXTENSION) {
+ if (!ext_id_len)
+ return true;
+ loop_len = ext_id_len;
+ list = &non_inherit_elem->data[3 + id_len];
+ id = elem->data[0];
+ } else {
+ if (!id_len)
+ return true;
+ loop_len = id_len;
+ list = &non_inherit_elem->data[2];
+ id = elem->id;
+ }
+
+ for (i = 0; i < loop_len; i++) {
+ if (list[i] == id)
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(cfg80211_is_element_inherited);
+
+static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
+ const u8 *ie, size_t ie_len,
+ u8 **pos, u8 *buf, size_t buf_len)
+{
+ if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
+ elem->data + elem->datalen > ie + ie_len))
+ return 0;
+
+ if (elem->datalen + 2 > buf + buf_len - *pos)
+ return 0;
+
+ memcpy(*pos, elem, elem->datalen + 2);
+ *pos += elem->datalen + 2;
+
+ /* Finish if it is not fragmented */
+ if (elem->datalen != 255)
+ return *pos - buf;
+
+ ie_len = ie + ie_len - elem->data - elem->datalen;
+ ie = (const u8 *)elem->data + elem->datalen;
+
+ for_each_element(elem, ie, ie_len) {
+ if (elem->id != WLAN_EID_FRAGMENT)
+ break;
+
+ if (elem->datalen + 2 > buf + buf_len - *pos)
+ return 0;
+
+ memcpy(*pos, elem, elem->datalen + 2);
+ *pos += elem->datalen + 2;
+
+ if (elem->datalen != 255)
+ break;
+ }
+
+ return *pos - buf;
+}
+
+static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
+ const u8 *subie, size_t subie_len,
+ u8 *new_ie, size_t new_ie_len)
+{
+ const struct element *non_inherit_elem, *parent, *sub;
+ u8 *pos = new_ie;
+ u8 id, ext_id;
+ unsigned int match_len;
+
+ non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
+ subie, subie_len);
+
+ /* We copy the elements one by one from the parent to the generated
+ * elements.
+ * If they are not inherited (included in subie or in the non
+ * inheritance element), then we copy all occurrences the first time
+ * we see this element type.
+ */
+ for_each_element(parent, ie, ielen) {
+ if (parent->id == WLAN_EID_FRAGMENT)
+ continue;
+
+ if (parent->id == WLAN_EID_EXTENSION) {
+ if (parent->datalen < 1)
+ continue;
+
+ id = WLAN_EID_EXTENSION;
+ ext_id = parent->data[0];
+ match_len = 1;
+ } else {
+ id = parent->id;
+ match_len = 0;
+ }
+
+ /* Find first occurrence in subie */
+ sub = cfg80211_find_elem_match(id, subie, subie_len,
+ &ext_id, match_len, 0);
+
+ /* Copy from parent if not in subie and inherited */
+ if (!sub &&
+ cfg80211_is_element_inherited(parent, non_inherit_elem)) {
+ if (!cfg80211_copy_elem_with_frags(parent,
+ ie, ielen,
+ &pos, new_ie,
+ new_ie_len))
+ return 0;
+
+ continue;
+ }
+
+ /* Already copied if an earlier element had the same type */
+ if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
+ &ext_id, match_len, 0))
+ continue;
+
+ /* Not inheriting, copy all similar elements from subie */
+ while (sub) {
+ if (!cfg80211_copy_elem_with_frags(sub,
+ subie, subie_len,
+ &pos, new_ie,
+ new_ie_len))
+ return 0;
+
+ sub = cfg80211_find_elem_match(id,
+ sub->data + sub->datalen,
+ subie_len + subie -
+ (sub->data +
+ sub->datalen),
+ &ext_id, match_len, 0);
+ }
+ }
+
+ /* The above misses elements that are included in subie but not in the
+ * parent, so do a pass over subie and append those.
+ * Skip the non-tx BSSID caps and non-inheritance element.
+ */
+ for_each_element(sub, subie, subie_len) {
+ if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
+ continue;
+
+ if (sub->id == WLAN_EID_FRAGMENT)
+ continue;
+
+ if (sub->id == WLAN_EID_EXTENSION) {
+ if (sub->datalen < 1)
+ continue;
+
+ id = WLAN_EID_EXTENSION;
+ ext_id = sub->data[0];
+ match_len = 1;
+
+ if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
+ continue;
+ } else {
+ id = sub->id;
+ match_len = 0;
+ }
+
+ /* Processed if one was included in the parent */
+ if (cfg80211_find_elem_match(id, ie, ielen,
+ &ext_id, match_len, 0))
+ continue;
+
+ if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
+ &pos, new_ie, new_ie_len))
+ return 0;
+ }
+
+ return pos - new_ie;
+}
+
+static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
+ const u8 *ssid, size_t ssid_len)
+{
+ const struct cfg80211_bss_ies *ies;
+ const struct element *ssid_elem;
+
+ if (bssid && !ether_addr_equal(a->bssid, bssid))
+ return false;
+
+ if (!ssid)
+ return true;
+
+ ies = rcu_access_pointer(a->ies);
+ if (!ies)
+ return false;
+ ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
+ if (!ssid_elem)
+ return false;
+ if (ssid_elem->datalen != ssid_len)
+ return false;
+ return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
+}
+
+static int
+cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
+ struct cfg80211_bss *nontrans_bss)
+{
+ const struct element *ssid_elem;
+ struct cfg80211_bss *bss = NULL;
+
+ rcu_read_lock();
+ ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
+ if (!ssid_elem) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ /* check if nontrans_bss is in the list */
+ list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
+ if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data,
+ ssid_elem->datalen)) {
+ rcu_read_unlock();
+ return 0;
+ }
+ }
+
+ rcu_read_unlock();
+
+ /*
+ * This is a bit weird - it's not on the list, but already on another
+ * one! The only way that could happen is if there's some BSSID/SSID
+ * shared by multiple APs in their multi-BSSID profiles, potentially
+ * with hidden SSID mixed in ... ignore it.
+ */
+ if (!list_empty(&nontrans_bss->nontrans_list))
+ return -EINVAL;
+
+ /* add to the list */
+ list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
+ return 0;
+}
+
+static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
+ unsigned long expire_time)
+{
+ struct cfg80211_internal_bss *bss, *tmp;
+ bool expired = false;
+
+ lockdep_assert_held(&rdev->bss_lock);
+
+ list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
+ if (atomic_read(&bss->hold))
+ continue;
+ if (!time_after(expire_time, bss->ts))
+ continue;
+
+ if (__cfg80211_unlink_bss(rdev, bss))
+ expired = true;
+ }
+
+ if (expired)
+ rdev->bss_generation++;
+}
+
+static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
+{
+ struct cfg80211_internal_bss *bss, *oldest = NULL;
+ bool ret;
+
+ lockdep_assert_held(&rdev->bss_lock);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (atomic_read(&bss->hold))
+ continue;
+
+ if (!list_empty(&bss->hidden_list) &&
+ !bss->pub.hidden_beacon_bss)
+ continue;
+
+ if (oldest && time_before(oldest->ts, bss->ts))
+ continue;
+ oldest = bss;
+ }
+
+ if (WARN_ON(!oldest))
+ return false;
+
+ /*
+ * The callers make sure to increase rdev->bss_generation if anything
+ * gets removed (and a new entry added), so there's no need to also do
+ * it here.
+ */
+
+ ret = __cfg80211_unlink_bss(rdev, oldest);
+ WARN_ON(!ret);
+ return ret;
+}
+
+static u8 cfg80211_parse_bss_param(u8 data,
+ struct cfg80211_colocated_ap *coloc_ap)
+{
+ coloc_ap->oct_recommended =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
+ coloc_ap->same_ssid =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
+ coloc_ap->multi_bss =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
+ coloc_ap->transmitted_bssid =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
+ coloc_ap->unsolicited_probe =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
+ coloc_ap->colocated_ess =
+ u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
+
+ return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
+}
+
+static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
+ const struct element **elem, u32 *s_ssid)
+{
+
+ *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
+ if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
+ return -EINVAL;
+
+ *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
+ return 0;
+}
+
+static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
+{
+ struct cfg80211_colocated_ap *ap, *tmp_ap;
+
+ list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
+ list_del(&ap->list);
+ kfree(ap);
+ }
+}
+
+static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
+ const u8 *pos, u8 length,
+ const struct element *ssid_elem,
+ u32 s_ssid_tmp)
+{
+ u8 bss_params;
+
+ entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
+
+ /* The length is already verified by the caller to contain bss_params */
+ if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) {
+ struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos;
+
+ memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
+ entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid);
+ entry->short_ssid_valid = true;
+
+ bss_params = tbtt_info->bss_params;
+
+ /* Ignore disabled links */
+ if (length >= offsetofend(typeof(*tbtt_info), mld_params)) {
+ if (le16_get_bits(tbtt_info->mld_params.params,
+ IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK))
+ return -EINVAL;
+ }
+
+ if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
+ psd_20))
+ entry->psd_20 = tbtt_info->psd_20;
+ } else {
+ struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos;
+
+ memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
+
+ bss_params = tbtt_info->bss_params;
+
+ if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
+ psd_20))
+ entry->psd_20 = tbtt_info->psd_20;
+ }
+
+ /* ignore entries with invalid BSSID */
+ if (!is_valid_ether_addr(entry->bssid))
+ return -EINVAL;
+
+ /* skip non colocated APs */
+ if (!cfg80211_parse_bss_param(bss_params, entry))
+ return -EINVAL;
+
+ /* no information about the short ssid. Consider the entry valid
+ * for now. It would later be dropped in case there are explicit
+ * SSIDs that need to be matched
+ */
+ if (!entry->same_ssid && !entry->short_ssid_valid)
+ return 0;
+
+ if (entry->same_ssid) {
+ entry->short_ssid = s_ssid_tmp;
+ entry->short_ssid_valid = true;
+
+ /*
+ * This is safe because we validate datalen in
+ * cfg80211_parse_colocated_ap(), before calling this
+ * function.
+ */
+ memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen);
+ entry->ssid_len = ssid_elem->datalen;
+ }
+
+ return 0;
+}
+
+static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
+ struct list_head *list)
+{
+ struct ieee80211_neighbor_ap_info *ap_info;
+ const struct element *elem, *ssid_elem;
+ const u8 *pos, *end;
+ u32 s_ssid_tmp;
+ int n_coloc = 0, ret;
+ LIST_HEAD(ap_list);
+
+ ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
+ if (ret)
+ return 0;
+
+ for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
+ ies->data, ies->len) {
+ pos = elem->data;
+ end = elem->data + elem->datalen;
+
+ /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
+ while (pos + sizeof(*ap_info) <= end) {
+ enum nl80211_band band;
+ int freq;
+ u8 length, i, count;
+
+ ap_info = (void *)pos;
+ count = u8_get_bits(ap_info->tbtt_info_hdr,
+ IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
+ length = ap_info->tbtt_info_len;
+
+ pos += sizeof(*ap_info);
+
+ if (!ieee80211_operating_class_to_band(ap_info->op_class,
+ &band))
+ break;
+
+ freq = ieee80211_channel_to_frequency(ap_info->channel,
+ band);
+
+ if (end - pos < count * length)
+ break;
+
+ if (u8_get_bits(ap_info->tbtt_info_hdr,
+ IEEE80211_AP_INFO_TBTT_HDR_TYPE) !=
+ IEEE80211_TBTT_INFO_TYPE_TBTT) {
+ pos += count * length;
+ continue;
+ }
+
+ /* TBTT info must include bss param + BSSID +
+ * (short SSID or same_ssid bit to be set).
+ * ignore other options, and move to the
+ * next AP info
+ */
+ if (band != NL80211_BAND_6GHZ ||
+ !(length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
+ bss_params) ||
+ length == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
+ length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
+ bss_params))) {
+ pos += count * length;
+ continue;
+ }
+
+ for (i = 0; i < count; i++) {
+ struct cfg80211_colocated_ap *entry;
+
+ entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
+ GFP_ATOMIC);
+
+ if (!entry)
+ goto error;
+
+ entry->center_freq = freq;
+
+ if (!cfg80211_parse_ap_info(entry, pos, length,
+ ssid_elem,
+ s_ssid_tmp)) {
+ n_coloc++;
+ list_add_tail(&entry->list, &ap_list);
+ } else {
+ kfree(entry);
+ }
+
+ pos += length;
+ }
+ }
+
+error:
+ if (pos != end) {
+ cfg80211_free_coloc_ap_list(&ap_list);
+ return 0;
+ }
+ }
+
+ list_splice_tail(&ap_list, list);
+ return n_coloc;
+}
+
+static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
+ struct ieee80211_channel *chan,
+ bool add_to_6ghz)
+{
+ int i;
+ u32 n_channels = request->n_channels;
+ struct cfg80211_scan_6ghz_params *params =
+ &request->scan_6ghz_params[request->n_6ghz_params];
+
+ for (i = 0; i < n_channels; i++) {
+ if (request->channels[i] == chan) {
+ if (add_to_6ghz)
+ params->channel_idx = i;
+ return;
+ }
+ }
+
+ request->channels[n_channels] = chan;
+ if (add_to_6ghz)
+ request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
+ n_channels;
+
+ request->n_channels++;
+}
+
+static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
+ struct cfg80211_scan_request *request)
+{
+ int i;
+ u32 s_ssid;
+
+ for (i = 0; i < request->n_ssids; i++) {
+ /* wildcard ssid in the scan request */
+ if (!request->ssids[i].ssid_len) {
+ if (ap->multi_bss && !ap->transmitted_bssid)
+ continue;
+
+ return true;
+ }
+
+ if (ap->ssid_len &&
+ ap->ssid_len == request->ssids[i].ssid_len) {
+ if (!memcmp(request->ssids[i].ssid, ap->ssid,
+ ap->ssid_len))
+ return true;
+ } else if (ap->short_ssid_valid) {
+ s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
+ request->ssids[i].ssid_len);
+
+ if (ap->short_ssid == s_ssid)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
+{
+ u8 i;
+ struct cfg80211_colocated_ap *ap;
+ int n_channels, count = 0, err;
+ struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
+ LIST_HEAD(coloc_ap_list);
+ bool need_scan_psc = true;
+ const struct ieee80211_sband_iftype_data *iftd;
+
+ rdev_req->scan_6ghz = true;
+
+ if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
+ return -EOPNOTSUPP;
+
+ iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
+ rdev_req->wdev->iftype);
+ if (!iftd || !iftd->he_cap.has_he)
+ return -EOPNOTSUPP;
+
+ n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
+
+ if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
+ struct cfg80211_internal_bss *intbss;
+
+ spin_lock_bh(&rdev->bss_lock);
+ list_for_each_entry(intbss, &rdev->bss_list, list) {
+ struct cfg80211_bss *res = &intbss->pub;
+ const struct cfg80211_bss_ies *ies;
+
+ ies = rcu_access_pointer(res->ies);
+ count += cfg80211_parse_colocated_ap(ies,
+ &coloc_ap_list);
+ }
+ spin_unlock_bh(&rdev->bss_lock);
+ }
+
+ request = kzalloc(struct_size(request, channels, n_channels) +
+ sizeof(*request->scan_6ghz_params) * count +
+ sizeof(*request->ssids) * rdev_req->n_ssids,
+ GFP_KERNEL);
+ if (!request) {
+ cfg80211_free_coloc_ap_list(&coloc_ap_list);
+ return -ENOMEM;
+ }
+
+ *request = *rdev_req;
+ request->n_channels = 0;
+ request->scan_6ghz_params =
+ (void *)&request->channels[n_channels];
+
+ /*
+ * PSC channels should not be scanned in case of direct scan with 1 SSID
+ * and at least one of the reported co-located APs with same SSID
+ * indicating that all APs in the same ESS are co-located
+ */
+ if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
+ list_for_each_entry(ap, &coloc_ap_list, list) {
+ if (ap->colocated_ess &&
+ cfg80211_find_ssid_match(ap, request)) {
+ need_scan_psc = false;
+ break;
+ }
+ }
+ }
+
+ /*
+ * add to the scan request the channels that need to be scanned
+ * regardless of the collocated APs (PSC channels or all channels
+ * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
+ */
+ for (i = 0; i < rdev_req->n_channels; i++) {
+ if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
+ ((need_scan_psc &&
+ cfg80211_channel_is_psc(rdev_req->channels[i])) ||
+ !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
+ cfg80211_scan_req_add_chan(request,
+ rdev_req->channels[i],
+ false);
+ }
+ }
+
+ if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
+ goto skip;
+
+ list_for_each_entry(ap, &coloc_ap_list, list) {
+ bool found = false;
+ struct cfg80211_scan_6ghz_params *scan_6ghz_params =
+ &request->scan_6ghz_params[request->n_6ghz_params];
+ struct ieee80211_channel *chan =
+ ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
+
+ if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
+ continue;
+
+ for (i = 0; i < rdev_req->n_channels; i++) {
+ if (rdev_req->channels[i] == chan)
+ found = true;
+ }
+
+ if (!found)
+ continue;
+
+ if (request->n_ssids > 0 &&
+ !cfg80211_find_ssid_match(ap, request))
+ continue;
+
+ if (!is_broadcast_ether_addr(request->bssid) &&
+ !ether_addr_equal(request->bssid, ap->bssid))
+ continue;
+
+ if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
+ continue;
+
+ cfg80211_scan_req_add_chan(request, chan, true);
+ memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
+ scan_6ghz_params->short_ssid = ap->short_ssid;
+ scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
+ scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
+ scan_6ghz_params->psd_20 = ap->psd_20;
+
+ /*
+ * If a PSC channel is added to the scan and 'need_scan_psc' is
+ * set to false, then all the APs that the scan logic is
+ * interested with on the channel are collocated and thus there
+ * is no need to perform the initial PSC channel listen.
+ */
+ if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
+ scan_6ghz_params->psc_no_listen = true;
+
+ request->n_6ghz_params++;
+ }
+
+skip:
+ cfg80211_free_coloc_ap_list(&coloc_ap_list);
+
+ if (request->n_channels) {
+ struct cfg80211_scan_request *old = rdev->int_scan_req;
+ rdev->int_scan_req = request;
+
+ /*
+ * Add the ssids from the parent scan request to the new scan
+ * request, so the driver would be able to use them in its
+ * probe requests to discover hidden APs on PSC channels.
+ */
+ request->ssids = (void *)&request->channels[request->n_channels];
+ request->n_ssids = rdev_req->n_ssids;
+ memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
+ request->n_ssids);
+
+ /*
+ * If this scan follows a previous scan, save the scan start
+ * info from the first part of the scan
+ */
+ if (old)
+ rdev->int_scan_req->info = old->info;
+
+ err = rdev_scan(rdev, request);
+ if (err) {
+ rdev->int_scan_req = old;
+ kfree(request);
+ } else {
+ kfree(old);
+ }
+
+ return err;
+ }
+
+ kfree(request);
+ return -EINVAL;
+}
+
+int cfg80211_scan(struct cfg80211_registered_device *rdev)
+{
+ struct cfg80211_scan_request *request;
+ struct cfg80211_scan_request *rdev_req = rdev->scan_req;
+ u32 n_channels = 0, idx, i;
+
+ if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
+ return rdev_scan(rdev, rdev_req);
+
+ for (i = 0; i < rdev_req->n_channels; i++) {
+ if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
+ n_channels++;
+ }
+
+ if (!n_channels)
+ return cfg80211_scan_6ghz(rdev);
+
+ request = kzalloc(struct_size(request, channels, n_channels),
+ GFP_KERNEL);
+ if (!request)
+ return -ENOMEM;
+
+ *request = *rdev_req;
+ request->n_channels = n_channels;
+
+ for (i = idx = 0; i < rdev_req->n_channels; i++) {
+ if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
+ request->channels[idx++] = rdev_req->channels[i];
+ }
+
+ rdev_req->scan_6ghz = false;
+ rdev->int_scan_req = request;
+ return rdev_scan(rdev, request);
+}
+
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
+ bool send_message)
+{
+ struct cfg80211_scan_request *request, *rdev_req;
+ struct wireless_dev *wdev;
+ struct sk_buff *msg;
+#ifdef CONFIG_CFG80211_WEXT
+ union iwreq_data wrqu;
+#endif
+
+ lockdep_assert_held(&rdev->wiphy.mtx);
+
+ if (rdev->scan_msg) {
+ nl80211_send_scan_msg(rdev, rdev->scan_msg);
+ rdev->scan_msg = NULL;
+ return;
+ }
+
+ rdev_req = rdev->scan_req;
+ if (!rdev_req)
+ return;
+
+ wdev = rdev_req->wdev;
+ request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
+
+ if (wdev_running(wdev) &&
+ (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
+ !rdev_req->scan_6ghz && !request->info.aborted &&
+ !cfg80211_scan_6ghz(rdev))
+ return;
+
+ /*
+ * This must be before sending the other events!
+ * Otherwise, wpa_supplicant gets completely confused with
+ * wext events.
+ */
+ if (wdev->netdev)
+ cfg80211_sme_scan_done(wdev->netdev);
+
+ if (!request->info.aborted &&
+ request->flags & NL80211_SCAN_FLAG_FLUSH) {
+ /* flush entries from previous scans */
+ spin_lock_bh(&rdev->bss_lock);
+ __cfg80211_bss_expire(rdev, request->scan_start);
+ spin_unlock_bh(&rdev->bss_lock);
+ }
+
+ msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
+
+#ifdef CONFIG_CFG80211_WEXT
+ if (wdev->netdev && !request->info.aborted) {
+ memset(&wrqu, 0, sizeof(wrqu));
+
+ wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
+ }
+#endif
+
+ dev_put(wdev->netdev);
+
+ kfree(rdev->int_scan_req);
+ rdev->int_scan_req = NULL;
+
+ kfree(rdev->scan_req);
+ rdev->scan_req = NULL;
+
+ if (!send_message)
+ rdev->scan_msg = msg;
+ else
+ nl80211_send_scan_msg(rdev, msg);
+}
+
+void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk)
+{
+ ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true);
+}
+
+void cfg80211_scan_done(struct cfg80211_scan_request *request,
+ struct cfg80211_scan_info *info)
+{
+ struct cfg80211_scan_info old_info = request->info;
+
+ trace_cfg80211_scan_done(request, info);
+ WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
+ request != wiphy_to_rdev(request->wiphy)->int_scan_req);
+
+ request->info = *info;
+
+ /*
+ * In case the scan is split, the scan_start_tsf and tsf_bssid should
+ * be of the first part. In such a case old_info.scan_start_tsf should
+ * be non zero.
+ */
+ if (request->scan_6ghz && old_info.scan_start_tsf) {
+ request->info.scan_start_tsf = old_info.scan_start_tsf;
+ memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
+ sizeof(request->info.tsf_bssid));
+ }
+
+ request->notified = true;
+ wiphy_work_queue(request->wiphy,
+ &wiphy_to_rdev(request->wiphy)->scan_done_wk);
+}
+EXPORT_SYMBOL(cfg80211_scan_done);
+
+void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req)
+{
+ lockdep_assert_held(&rdev->wiphy.mtx);
+
+ list_add_rcu(&req->list, &rdev->sched_scan_req_list);
+}
+
+static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req)
+{
+ lockdep_assert_held(&rdev->wiphy.mtx);
+
+ list_del_rcu(&req->list);
+ kfree_rcu(req, rcu_head);
+}
+
+static struct cfg80211_sched_scan_request *
+cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
+{
+ struct cfg80211_sched_scan_request *pos;
+
+ list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
+ lockdep_is_held(&rdev->wiphy.mtx)) {
+ if (pos->reqid == reqid)
+ return pos;
+ }
+ return NULL;
+}
+
+/*
+ * Determines if a scheduled scan request can be handled. When a legacy
+ * scheduled scan is running no other scheduled scan is allowed regardless
+ * whether the request is for legacy or multi-support scan. When a multi-support
+ * scheduled scan is running a request for legacy scan is not allowed. In this
+ * case a request for multi-support scan can be handled if resources are
+ * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
+ */
+int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
+ bool want_multi)
+{
+ struct cfg80211_sched_scan_request *pos;
+ int i = 0;
+
+ list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
+ /* request id zero means legacy in progress */
+ if (!i && !pos->reqid)
+ return -EINPROGRESS;
+ i++;
+ }
+
+ if (i) {
+ /* no legacy allowed when multi request(s) are active */
+ if (!want_multi)
+ return -EINPROGRESS;
+
+ /* resource limit reached */
+ if (i == rdev->wiphy.max_sched_scan_reqs)
+ return -ENOSPC;
+ }
+ return 0;
+}
+
+void cfg80211_sched_scan_results_wk(struct work_struct *work)
+{
+ struct cfg80211_registered_device *rdev;
+ struct cfg80211_sched_scan_request *req, *tmp;
+
+ rdev = container_of(work, struct cfg80211_registered_device,
+ sched_scan_res_wk);
+
+ wiphy_lock(&rdev->wiphy);
+ list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
+ if (req->report_results) {
+ req->report_results = false;
+ if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
+ /* flush entries from previous scans */
+ spin_lock_bh(&rdev->bss_lock);
+ __cfg80211_bss_expire(rdev, req->scan_start);
+ spin_unlock_bh(&rdev->bss_lock);
+ req->scan_start = jiffies;
+ }
+ nl80211_send_sched_scan(req,
+ NL80211_CMD_SCHED_SCAN_RESULTS);
+ }
+ }
+ wiphy_unlock(&rdev->wiphy);
+}
+
+void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_sched_scan_request *request;
+
+ trace_cfg80211_sched_scan_results(wiphy, reqid);
+ /* ignore if we're not scanning */
+
+ rcu_read_lock();
+ request = cfg80211_find_sched_scan_req(rdev, reqid);
+ if (request) {
+ request->report_results = true;
+ queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_results);
+
+void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+ lockdep_assert_held(&wiphy->mtx);
+
+ trace_cfg80211_sched_scan_stopped(wiphy, reqid);
+
+ __cfg80211_stop_sched_scan(rdev, reqid, true);
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
+
+void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
+{
+ wiphy_lock(wiphy);
+ cfg80211_sched_scan_stopped_locked(wiphy, reqid);
+ wiphy_unlock(wiphy);
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
+
+int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
+ struct cfg80211_sched_scan_request *req,
+ bool driver_initiated)
+{
+ lockdep_assert_held(&rdev->wiphy.mtx);
+
+ if (!driver_initiated) {
+ int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
+ if (err)
+ return err;
+ }
+
+ nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
+
+ cfg80211_del_sched_scan_req(rdev, req);
+
+ return 0;
+}
+
+int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
+ u64 reqid, bool driver_initiated)
+{
+ struct cfg80211_sched_scan_request *sched_scan_req;
+
+ lockdep_assert_held(&rdev->wiphy.mtx);
+
+ sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
+ if (!sched_scan_req)
+ return -ENOENT;
+
+ return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
+ driver_initiated);
+}
+
+void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
+ unsigned long age_secs)
+{
+ struct cfg80211_internal_bss *bss;
+ unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
+
+ spin_lock_bh(&rdev->bss_lock);
+ list_for_each_entry(bss, &rdev->bss_list, list)
+ bss->ts -= age_jiffies;
+ spin_unlock_bh(&rdev->bss_lock);
+}
+
+void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
+{
+ __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
+}
+
+void cfg80211_bss_flush(struct wiphy *wiphy)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+ spin_lock_bh(&rdev->bss_lock);
+ __cfg80211_bss_expire(rdev, jiffies);
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_bss_flush);
+
+const struct element *
+cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
+ const u8 *match, unsigned int match_len,
+ unsigned int match_offset)
+{
+ const struct element *elem;
+
+ for_each_element_id(elem, eid, ies, len) {
+ if (elem->datalen >= match_offset + match_len &&
+ !memcmp(elem->data + match_offset, match, match_len))
+ return elem;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(cfg80211_find_elem_match);
+
+const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
+ const u8 *ies,
+ unsigned int len)
+{
+ const struct element *elem;
+ u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
+ int match_len = (oui_type < 0) ? 3 : sizeof(match);
+
+ if (WARN_ON(oui_type > 0xff))
+ return NULL;
+
+ elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
+ match, match_len, 0);
+
+ if (!elem || elem->datalen < 4)
+ return NULL;
+
+ return elem;
+}
+EXPORT_SYMBOL(cfg80211_find_vendor_elem);
+
+/**
+ * enum bss_compare_mode - BSS compare mode
+ * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
+ * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
+ * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
+ */
+enum bss_compare_mode {
+ BSS_CMP_REGULAR,
+ BSS_CMP_HIDE_ZLEN,
+ BSS_CMP_HIDE_NUL,
+};
+
+static int cmp_bss(struct cfg80211_bss *a,
+ struct cfg80211_bss *b,
+ enum bss_compare_mode mode)
+{
+ const struct cfg80211_bss_ies *a_ies, *b_ies;
+ const u8 *ie1 = NULL;
+ const u8 *ie2 = NULL;
+ int i, r;
+
+ if (a->channel != b->channel)
+ return (b->channel->center_freq * 1000 + b->channel->freq_offset) -
+ (a->channel->center_freq * 1000 + a->channel->freq_offset);
+
+ 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;
+}
+
+static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
+ const struct cfg80211_bss_ies *new_ies,
+ const struct cfg80211_bss_ies *old_ies)
+{
+ struct cfg80211_internal_bss *bss;
+
+ /* Assign beacon IEs to all sub entries */
+ list_for_each_entry(bss, &known->hidden_list, hidden_list) {
+ const struct cfg80211_bss_ies *ies;
+
+ ies = rcu_access_pointer(bss->pub.beacon_ies);
+ WARN_ON(ies != old_ies);
+
+ rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
+ }
+}
+
+static bool
+cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *known,
+ struct cfg80211_internal_bss *new,
+ bool signal_valid)
+{
+ lockdep_assert_held(&rdev->bss_lock);
+
+ /* Update IEs */
+ if (rcu_access_pointer(new->pub.proberesp_ies)) {
+ const struct cfg80211_bss_ies *old;
+
+ old = rcu_access_pointer(known->pub.proberesp_ies);
+
+ rcu_assign_pointer(known->pub.proberesp_ies,
+ new->pub.proberesp_ies);
+ /* Override possible earlier Beacon frame IEs */
+ rcu_assign_pointer(known->pub.ies,
+ new->pub.proberesp_ies);
+ if (old)
+ kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+ } else if (rcu_access_pointer(new->pub.beacon_ies)) {
+ const struct cfg80211_bss_ies *old;
+
+ if (known->pub.hidden_beacon_bss &&
+ !list_empty(&known->hidden_list)) {
+ const struct cfg80211_bss_ies *f;
+
+ /* The known BSS struct is one of the probe
+ * response members of a group, but we're
+ * receiving a beacon (beacon_ies in the new
+ * bss is used). This can only mean that the
+ * AP changed its beacon from not having an
+ * SSID to showing it, which is confusing so
+ * drop this information.
+ */
+
+ f = rcu_access_pointer(new->pub.beacon_ies);
+ kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
+ return false;
+ }
+
+ old = rcu_access_pointer(known->pub.beacon_ies);
+
+ rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
+
+ /* Override IEs if they were from a beacon before */
+ if (old == rcu_access_pointer(known->pub.ies))
+ rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
+
+ cfg80211_update_hidden_bsses(known,
+ rcu_access_pointer(new->pub.beacon_ies),
+ old);
+
+ if (old)
+ kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+ }
+
+ known->pub.beacon_interval = new->pub.beacon_interval;
+
+ /* don't update the signal if beacon was heard on
+ * adjacent channel.
+ */
+ if (signal_valid)
+ known->pub.signal = new->pub.signal;
+ known->pub.capability = new->pub.capability;
+ known->ts = new->ts;
+ known->ts_boottime = new->ts_boottime;
+ known->parent_tsf = new->parent_tsf;
+ known->pub.chains = new->pub.chains;
+ memcpy(known->pub.chain_signal, new->pub.chain_signal,
+ IEEE80211_MAX_CHAINS);
+ ether_addr_copy(known->parent_bssid, new->parent_bssid);
+ known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
+ known->pub.bssid_index = new->pub.bssid_index;
+
+ return true;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+static struct cfg80211_internal_bss *
+__cfg80211_bss_update(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *tmp,
+ bool signal_valid, unsigned long ts)
+{
+ struct cfg80211_internal_bss *found = NULL;
+
+ if (WARN_ON(!tmp->pub.channel))
+ return NULL;
+
+ tmp->ts = ts;
+
+ if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
+ return NULL;
+ }
+
+ found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
+
+ if (found) {
+ if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
+ return NULL;
+ } 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);
+ return NULL;
+ }
+ memcpy(new, tmp, sizeof(*new));
+ new->refcount = 1;
+ INIT_LIST_HEAD(&new->hidden_list);
+ INIT_LIST_HEAD(&new->pub.nontrans_list);
+ /* we'll set this later if it was non-NULL */
+ new->pub.transmitted_bss = NULL;
+
+ if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
+ hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
+ if (!hidden)
+ hidden = rb_find_bss(rdev, tmp,
+ BSS_CMP_HIDE_NUL);
+ if (hidden) {
+ new->pub.hidden_beacon_bss = &hidden->pub;
+ list_add(&new->hidden_list,
+ &hidden->hidden_list);
+ hidden->refcount++;
+ rcu_assign_pointer(new->pub.beacon_ies,
+ hidden->pub.beacon_ies);
+ }
+ } else {
+ /*
+ * Ok so we found a beacon, and don't have an entry. If
+ * it's a beacon with hidden SSID, we might be in for an
+ * expensive search for any probe responses that should
+ * be grouped with this beacon for updates ...
+ */
+ if (!cfg80211_combine_bsses(rdev, new)) {
+ bss_ref_put(rdev, new);
+ return NULL;
+ }
+ }
+
+ if (rdev->bss_entries >= bss_entries_limit &&
+ !cfg80211_bss_expire_oldest(rdev)) {
+ bss_ref_put(rdev, new);
+ return NULL;
+ }
+
+ /* This must be before the call to bss_ref_get */
+ if (tmp->pub.transmitted_bss) {
+ new->pub.transmitted_bss = tmp->pub.transmitted_bss;
+ bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss));
+ }
+
+ 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);
+
+ return found;
+}
+
+struct cfg80211_internal_bss *
+cfg80211_bss_update(struct cfg80211_registered_device *rdev,
+ struct cfg80211_internal_bss *tmp,
+ bool signal_valid, unsigned long ts)
+{
+ struct cfg80211_internal_bss *res;
+
+ spin_lock_bh(&rdev->bss_lock);
+ res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts);
+ spin_unlock_bh(&rdev->bss_lock);
+
+ return res;
+}
+
+int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
+ enum nl80211_band band)
+{
+ const struct element *tmp;
+
+ if (band == NL80211_BAND_6GHZ) {
+ struct ieee80211_he_operation *he_oper;
+
+ tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
+ ielen);
+ if (tmp && tmp->datalen >= sizeof(*he_oper) &&
+ tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
+ const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
+
+ he_oper = (void *)&tmp->data[1];
+
+ he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
+ if (!he_6ghz_oper)
+ return -1;
+
+ return he_6ghz_oper->primary;
+ }
+ } else if (band == NL80211_BAND_S1GHZ) {
+ tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
+ if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
+ struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
+
+ return s1gop->oper_ch;
+ }
+ } else {
+ tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
+ if (tmp && tmp->datalen == 1)
+ return tmp->data[0];
+
+ tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
+ if (tmp &&
+ tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
+ struct ieee80211_ht_operation *htop = (void *)tmp->data;
+
+ return htop->primary_chan;
+ }
+ }
+
+ return -1;
+}
+EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
+
+/*
+ * Update RX channel information based on the available frame payload
+ * information. This is mainly for the 2.4 GHz band where frames can be received
+ * from neighboring channels and the Beacon frames use the DSSS Parameter Set
+ * element to indicate the current (transmitting) channel, but this might also
+ * be needed on other bands if RX frequency does not match with the actual
+ * operating channel of a BSS, or if the AP reports a different primary channel.
+ */
+static struct ieee80211_channel *
+cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
+ struct ieee80211_channel *channel,
+ enum nl80211_bss_scan_width scan_width)
+{
+ u32 freq;
+ int channel_number;
+ struct ieee80211_channel *alt_channel;
+
+ channel_number = cfg80211_get_ies_channel_number(ie, ielen,
+ channel->band);
+
+ if (channel_number < 0) {
+ /* No channel information in frame payload */
+ return channel;
+ }
+
+ freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
+
+ /*
+ * Frame info (beacon/prob res) is the same as received channel,
+ * no need for further processing.
+ */
+ if (freq == ieee80211_channel_to_khz(channel))
+ return channel;
+
+ alt_channel = ieee80211_get_channel_khz(wiphy, freq);
+ if (!alt_channel) {
+ if (channel->band == NL80211_BAND_2GHZ ||
+ channel->band == NL80211_BAND_6GHZ) {
+ /*
+ * 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) or beyond the 6 GHz channel range.
+ */
+ 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;
+}
+
+struct cfg80211_inform_single_bss_data {
+ struct cfg80211_inform_bss *drv_data;
+ enum cfg80211_bss_frame_type ftype;
+ struct ieee80211_channel *channel;
+ u8 bssid[ETH_ALEN];
+ u64 tsf;
+ u16 capability;
+ u16 beacon_interval;
+ const u8 *ie;
+ size_t ielen;
+
+ enum {
+ BSS_SOURCE_DIRECT = 0,
+ BSS_SOURCE_MBSSID,
+ BSS_SOURCE_STA_PROFILE,
+ } bss_source;
+ /* Set if reporting bss_source != BSS_SOURCE_DIRECT */
+ struct cfg80211_bss *source_bss;
+ u8 max_bssid_indicator;
+ u8 bssid_index;
+};
+
+/* 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_single_bss_data *data,
+ gfp_t gfp)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_inform_bss *drv_data = data->drv_data;
+ struct cfg80211_bss_ies *ies;
+ struct ieee80211_channel *channel;
+ struct cfg80211_internal_bss tmp = {}, *res;
+ int bss_type;
+ bool signal_valid;
+ unsigned long ts;
+
+ if (WARN_ON(!wiphy))
+ return NULL;
+
+ if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+ (drv_data->signal < 0 || drv_data->signal > 100)))
+ return NULL;
+
+ if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss))
+ return NULL;
+
+ channel = data->channel;
+ if (!channel)
+ channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen,
+ drv_data->chan,
+ drv_data->scan_width);
+ if (!channel)
+ return NULL;
+
+ memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN);
+ tmp.pub.channel = channel;
+ tmp.pub.scan_width = drv_data->scan_width;
+ if (data->bss_source != BSS_SOURCE_STA_PROFILE)
+ tmp.pub.signal = drv_data->signal;
+ else
+ tmp.pub.signal = 0;
+ tmp.pub.beacon_interval = data->beacon_interval;
+ tmp.pub.capability = data->capability;
+ tmp.ts_boottime = drv_data->boottime_ns;
+ tmp.parent_tsf = drv_data->parent_tsf;
+ ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid);
+
+ if (data->bss_source != BSS_SOURCE_DIRECT) {
+ tmp.pub.transmitted_bss = data->source_bss;
+ ts = bss_from_pub(data->source_bss)->ts;
+ tmp.pub.bssid_index = data->bssid_index;
+ tmp.pub.max_bssid_indicator = data->max_bssid_indicator;
+ } else {
+ ts = jiffies;
+
+ if (channel->band == NL80211_BAND_60GHZ) {
+ bss_type = data->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 (data->capability & WLAN_CAPABILITY_ESS)
+ regulatory_hint_found_beacon(wiphy, channel,
+ gfp);
+ }
+ }
+
+ /*
+ * 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) + data->ielen, gfp);
+ if (!ies)
+ return NULL;
+ ies->len = data->ielen;
+ ies->tsf = data->tsf;
+ ies->from_beacon = false;
+ memcpy(ies->data, data->ie, data->ielen);
+
+ switch (data->ftype) {
+ case CFG80211_BSS_FTYPE_BEACON:
+ ies->from_beacon = true;
+ fallthrough;
+ case CFG80211_BSS_FTYPE_UNKNOWN:
+ rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+ break;
+ case CFG80211_BSS_FTYPE_PRESP:
+ rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+ break;
+ }
+ rcu_assign_pointer(tmp.pub.ies, ies);
+
+ signal_valid = drv_data->chan == channel;
+ spin_lock_bh(&rdev->bss_lock);
+ res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts);
+ if (!res)
+ goto drop;
+
+ rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data);
+
+ if (data->bss_source == BSS_SOURCE_MBSSID) {
+ /* this is a nontransmitting bss, we need to add it to
+ * transmitting bss' list if it is not there
+ */
+ if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) {
+ if (__cfg80211_unlink_bss(rdev, res)) {
+ rdev->bss_generation++;
+ res = NULL;
+ }
+ }
+
+ if (!res)
+ goto drop;
+ }
+ spin_unlock_bh(&rdev->bss_lock);
+
+ trace_cfg80211_return_bss(&res->pub);
+ /* __cfg80211_bss_update gives us a referenced result */
+ return &res->pub;
+
+drop:
+ spin_unlock_bh(&rdev->bss_lock);
+ return NULL;
+}
+
+static const struct element
+*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
+ const struct element *mbssid_elem,
+ const struct element *sub_elem)
+{
+ const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
+ const struct element *next_mbssid;
+ const struct element *next_sub;
+
+ next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
+ mbssid_end,
+ ielen - (mbssid_end - ie));
+
+ /*
+ * If it is not the last subelement in current MBSSID IE or there isn't
+ * a next MBSSID IE - profile is complete.
+ */
+ if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
+ !next_mbssid)
+ return NULL;
+
+ /* For any length error, just return NULL */
+
+ if (next_mbssid->datalen < 4)
+ return NULL;
+
+ next_sub = (void *)&next_mbssid->data[1];
+
+ if (next_mbssid->data + next_mbssid->datalen <
+ next_sub->data + next_sub->datalen)
+ return NULL;
+
+ if (next_sub->id != 0 || next_sub->datalen < 2)
+ return NULL;
+
+ /*
+ * Check if the first element in the next sub element is a start
+ * of a new profile
+ */
+ return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
+ NULL : next_mbssid;
+}
+
+size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
+ const struct element *mbssid_elem,
+ const struct element *sub_elem,
+ u8 *merged_ie, size_t max_copy_len)
+{
+ size_t copied_len = sub_elem->datalen;
+ const struct element *next_mbssid;
+
+ if (sub_elem->datalen > max_copy_len)
+ return 0;
+
+ memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
+
+ while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
+ mbssid_elem,
+ sub_elem))) {
+ const struct element *next_sub = (void *)&next_mbssid->data[1];
+
+ if (copied_len + next_sub->datalen > max_copy_len)
+ break;
+ memcpy(merged_ie + copied_len, next_sub->data,
+ next_sub->datalen);
+ copied_len += next_sub->datalen;
+ }
+
+ return copied_len;
+}
+EXPORT_SYMBOL(cfg80211_merge_profile);
+
+static void
+cfg80211_parse_mbssid_data(struct wiphy *wiphy,
+ struct cfg80211_inform_single_bss_data *tx_data,
+ struct cfg80211_bss *source_bss,
+ gfp_t gfp)
+{
+ struct cfg80211_inform_single_bss_data data = {
+ .drv_data = tx_data->drv_data,
+ .ftype = tx_data->ftype,
+ .tsf = tx_data->tsf,
+ .beacon_interval = tx_data->beacon_interval,
+ .source_bss = source_bss,
+ .bss_source = BSS_SOURCE_MBSSID,
+ };
+ const u8 *mbssid_index_ie;
+ const struct element *elem, *sub;
+ u8 *new_ie, *profile;
+ u64 seen_indices = 0;
+ struct cfg80211_bss *bss;
+
+ if (!source_bss)
+ return;
+ if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
+ tx_data->ie, tx_data->ielen))
+ return;
+ if (!wiphy->support_mbssid)
+ return;
+ if (wiphy->support_only_he_mbssid &&
+ !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
+ tx_data->ie, tx_data->ielen))
+ return;
+
+ new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
+ if (!new_ie)
+ return;
+
+ profile = kmalloc(tx_data->ielen, gfp);
+ if (!profile)
+ goto out;
+
+ for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
+ tx_data->ie, tx_data->ielen) {
+ if (elem->datalen < 4)
+ continue;
+ if (elem->data[0] < 1 || (int)elem->data[0] > 8)
+ continue;
+ for_each_element(sub, elem->data + 1, elem->datalen - 1) {
+ u8 profile_len;
+
+ if (sub->id != 0 || sub->datalen < 4) {
+ /* not a valid BSS profile */
+ continue;
+ }
+
+ if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
+ sub->data[1] != 2) {
+ /* The first element within the Nontransmitted
+ * BSSID Profile is not the Nontransmitted
+ * BSSID Capability element.
+ */
+ continue;
+ }
+
+ memset(profile, 0, tx_data->ielen);
+ profile_len = cfg80211_merge_profile(tx_data->ie,
+ tx_data->ielen,
+ elem,
+ sub,
+ profile,
+ tx_data->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]);
+
+ data.bssid_index = mbssid_index_ie[2];
+ data.max_bssid_indicator = elem->data[0];
+
+ cfg80211_gen_new_bssid(tx_data->bssid,
+ data.max_bssid_indicator,
+ data.bssid_index,
+ data.bssid);
+
+ memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
+ data.ie = new_ie;
+ data.ielen = cfg80211_gen_new_ie(tx_data->ie,
+ tx_data->ielen,
+ profile,
+ profile_len,
+ new_ie,
+ IEEE80211_MAX_DATA_LEN);
+ if (!data.ielen)
+ continue;
+
+ data.capability = get_unaligned_le16(profile + 2);
+ bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
+ if (!bss)
+ break;
+ cfg80211_put_bss(wiphy, bss);
+ }
+ }
+
+out:
+ kfree(new_ie);
+ kfree(profile);
+}
+
+ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies,
+ size_t ieslen, u8 *data, size_t data_len,
+ u8 frag_id)
+{
+ const struct element *next;
+ ssize_t copied;
+ u8 elem_datalen;
+
+ if (!elem)
+ return -EINVAL;
+
+ /* elem might be invalid after the memmove */
+ next = (void *)(elem->data + elem->datalen);
+ elem_datalen = elem->datalen;
+
+ if (elem->id == WLAN_EID_EXTENSION) {
+ copied = elem->datalen - 1;
+ if (copied > data_len)
+ return -ENOSPC;
+
+ memmove(data, elem->data + 1, copied);
+ } else {
+ copied = elem->datalen;
+ if (copied > data_len)
+ return -ENOSPC;
+
+ memmove(data, elem->data, copied);
+ }
+
+ /* Fragmented elements must have 255 bytes */
+ if (elem_datalen < 255)
+ return copied;
+
+ for (elem = next;
+ elem->data < ies + ieslen &&
+ elem->data + elem->datalen <= ies + ieslen;
+ elem = next) {
+ /* elem might be invalid after the memmove */
+ next = (void *)(elem->data + elem->datalen);
+
+ if (elem->id != frag_id)
+ break;
+
+ elem_datalen = elem->datalen;
+
+ if (copied + elem_datalen > data_len)
+ return -ENOSPC;
+
+ memmove(data + copied, elem->data, elem_datalen);
+ copied += elem_datalen;
+
+ /* Only the last fragment may be short */
+ if (elem_datalen != 255)
+ break;
+ }
+
+ return copied;
+}
+EXPORT_SYMBOL(cfg80211_defragment_element);
+
+struct cfg80211_mle {
+ struct ieee80211_multi_link_elem *mle;
+ struct ieee80211_mle_per_sta_profile
+ *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS];
+ ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS];
+
+ u8 data[];
+};
+
+static struct cfg80211_mle *
+cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen,
+ gfp_t gfp)
+{
+ const struct element *elem;
+ struct cfg80211_mle *res;
+ size_t buf_len;
+ ssize_t mle_len;
+ u8 common_size, idx;
+
+ if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1))
+ return NULL;
+
+ /* Required length for first defragmentation */
+ buf_len = mle->datalen - 1;
+ for_each_element(elem, mle->data + mle->datalen,
+ ielen - sizeof(*mle) + mle->datalen) {
+ if (elem->id != WLAN_EID_FRAGMENT)
+ break;
+
+ buf_len += elem->datalen;
+ }
+
+ res = kzalloc(struct_size(res, data, buf_len), gfp);
+ if (!res)
+ return NULL;
+
+ mle_len = cfg80211_defragment_element(mle, ie, ielen,
+ res->data, buf_len,
+ WLAN_EID_FRAGMENT);
+ if (mle_len < 0)
+ goto error;
+
+ res->mle = (void *)res->data;
+
+ /* Find the sub-element area in the buffer */
+ common_size = ieee80211_mle_common_size((u8 *)res->mle);
+ ie = res->data + common_size;
+ ielen = mle_len - common_size;
+
+ idx = 0;
+ for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
+ ie, ielen) {
+ res->sta_prof[idx] = (void *)elem->data;
+ res->sta_prof_len[idx] = elem->datalen;
+
+ idx++;
+ if (idx >= IEEE80211_MLD_MAX_NUM_LINKS)
+ break;
+ }
+ if (!for_each_element_completed(elem, ie, ielen))
+ goto error;
+
+ /* Defragment sta_info in-place */
+ for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx];
+ idx++) {
+ if (res->sta_prof_len[idx] < 255)
+ continue;
+
+ elem = (void *)res->sta_prof[idx] - 2;
+
+ if (idx + 1 < ARRAY_SIZE(res->sta_prof) &&
+ res->sta_prof[idx + 1])
+ buf_len = (u8 *)res->sta_prof[idx + 1] -
+ (u8 *)res->sta_prof[idx];
+ else
+ buf_len = ielen + ie - (u8 *)elem;
+
+ res->sta_prof_len[idx] =
+ cfg80211_defragment_element(elem,
+ (u8 *)elem, buf_len,
+ (u8 *)res->sta_prof[idx],
+ buf_len,
+ IEEE80211_MLE_SUBELEM_FRAGMENT);
+ if (res->sta_prof_len[idx] < 0)
+ goto error;
+ }
+
+ return res;
+
+error:
+ kfree(res);
+ return NULL;
+}
+
+static bool
+cfg80211_tbtt_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
+ const struct ieee80211_neighbor_ap_info **ap_info,
+ const u8 **tbtt_info)
+{
+ const struct ieee80211_neighbor_ap_info *info;
+ const struct element *rnr;
+ const u8 *pos, *end;
+
+ for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) {
+ pos = rnr->data;
+ end = rnr->data + rnr->datalen;
+
+ /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
+ while (sizeof(*info) <= end - pos) {
+ const struct ieee80211_rnr_mld_params *mld_params;
+ u16 params;
+ u8 length, i, count, mld_params_offset;
+ u8 type, lid;
+
+ info = (void *)pos;
+ count = u8_get_bits(info->tbtt_info_hdr,
+ IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
+ length = info->tbtt_info_len;
+
+ pos += sizeof(*info);
+
+ if (count * length > end - pos)
+ return false;
+
+ type = u8_get_bits(info->tbtt_info_hdr,
+ IEEE80211_AP_INFO_TBTT_HDR_TYPE);
+
+ /* Only accept full TBTT information. NSTR mobile APs
+ * use the shortened version, but we ignore them here.
+ */
+ if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
+ length >=
+ offsetofend(struct ieee80211_tbtt_info_ge_11,
+ mld_params)) {
+ mld_params_offset =
+ offsetof(struct ieee80211_tbtt_info_ge_11, mld_params);
+ } else {
+ pos += count * length;
+ continue;
+ }
+
+ for (i = 0; i < count; i++) {
+ mld_params = (void *)pos + mld_params_offset;
+ params = le16_to_cpu(mld_params->params);
+
+ lid = u16_get_bits(params,
+ IEEE80211_RNR_MLD_PARAMS_LINK_ID);
+
+ if (mld_id == mld_params->mld_id &&
+ link_id == lid) {
+ *ap_info = info;
+ *tbtt_info = pos;
+
+ return true;
+ }
+
+ pos += length;
+ }
+ }
+ }
+
+ return false;
+}
+
+static void
+cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy,
+ struct cfg80211_inform_single_bss_data *tx_data,
+ struct cfg80211_bss *source_bss,
+ const struct element *elem,
+ gfp_t gfp)
+{
+ struct cfg80211_inform_single_bss_data data = {
+ .drv_data = tx_data->drv_data,
+ .ftype = tx_data->ftype,
+ .source_bss = source_bss,
+ .bss_source = BSS_SOURCE_STA_PROFILE,
+ };
+ struct ieee80211_multi_link_elem *ml_elem;
+ struct cfg80211_mle *mle;
+ u16 control;
+ u8 *new_ie;
+ struct cfg80211_bss *bss;
+ int mld_id;
+ u16 seen_links = 0;
+ const u8 *pos;
+ u8 i;
+
+ if (!ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
+ return;
+
+ ml_elem = (void *)elem->data + 1;
+ control = le16_to_cpu(ml_elem->control);
+ if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) !=
+ IEEE80211_ML_CONTROL_TYPE_BASIC)
+ return;
+
+ /* Must be present when transmitted by an AP (in a probe response) */
+ if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) ||
+ !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) ||
+ !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP))
+ return;
+
+ /* length + MLD MAC address + link ID info + BSS Params Change Count */
+ pos = ml_elem->variable + 1 + 6 + 1 + 1;
+
+ if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY))
+ pos += 2;
+ if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_EML_CAPA))
+ pos += 2;
+
+ /* MLD capabilities and operations */
+ pos += 2;
+
+ /*
+ * The MLD ID of the reporting AP is always zero. It is set if the AP
+ * is part of an MBSSID set and will be non-zero for ML Elements
+ * relating to a nontransmitted BSS (matching the Multi-BSSID Index,
+ * Draft P802.11be_D3.2, 35.3.4.2)
+ */
+ if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MLD_ID)) {
+ mld_id = *pos;
+ pos += 1;
+ } else {
+ mld_id = 0;
+ }
+
+ /* Extended MLD capabilities and operations */
+ pos += 2;
+
+ /* Fully defrag the ML element for sta information/profile iteration */
+ mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp);
+ if (!mle)
+ return;
+
+ new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
+ if (!new_ie)
+ goto out;
+
+ for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) {
+ const struct ieee80211_neighbor_ap_info *ap_info;
+ enum nl80211_band band;
+ u32 freq;
+ const u8 *profile;
+ const u8 *tbtt_info;
+ ssize_t profile_len;
+ u8 link_id;
+
+ if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i],
+ mle->sta_prof_len[i]))
+ continue;
+
+ control = le16_to_cpu(mle->sta_prof[i]->control);
+
+ if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
+ continue;
+
+ link_id = u16_get_bits(control,
+ IEEE80211_MLE_STA_CONTROL_LINK_ID);
+ if (seen_links & BIT(link_id))
+ break;
+ seen_links |= BIT(link_id);
+
+ if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) ||
+ !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) ||
+ !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT))
+ continue;
+
+ memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN);
+ data.beacon_interval =
+ get_unaligned_le16(mle->sta_prof[i]->variable + 6);
+ data.tsf = tx_data->tsf +
+ get_unaligned_le64(mle->sta_prof[i]->variable + 8);
+
+ /* sta_info_len counts itself */
+ profile = mle->sta_prof[i]->variable +
+ mle->sta_prof[i]->sta_info_len - 1;
+ profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] -
+ profile;
+
+ if (profile_len < 2)
+ continue;
+
+ data.capability = get_unaligned_le16(profile);
+ profile += 2;
+ profile_len -= 2;
+
+ /* Find in RNR to look up channel information */
+ if (!cfg80211_tbtt_info_for_mld_ap(tx_data->ie, tx_data->ielen,
+ mld_id, link_id,
+ &ap_info, &tbtt_info))
+ continue;
+
+ /* We could sanity check the BSSID is included */
+
+ if (!ieee80211_operating_class_to_band(ap_info->op_class,
+ &band))
+ continue;
+
+ freq = ieee80211_channel_to_freq_khz(ap_info->channel, band);
+ data.channel = ieee80211_get_channel_khz(wiphy, freq);
+
+ /* Generate new elements */
+ memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
+ data.ie = new_ie;
+ data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen,
+ profile, profile_len,
+ new_ie,
+ IEEE80211_MAX_DATA_LEN);
+ if (!data.ielen)
+ continue;
+
+ bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
+ if (!bss)
+ break;
+ cfg80211_put_bss(wiphy, bss);
+ }
+
+out:
+ kfree(new_ie);
+ kfree(mle);
+}
+
+static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
+ struct cfg80211_inform_single_bss_data *tx_data,
+ struct cfg80211_bss *source_bss,
+ gfp_t gfp)
+{
+ const struct element *elem;
+
+ if (!source_bss)
+ return;
+
+ if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
+ return;
+
+ for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK,
+ tx_data->ie, tx_data->ielen)
+ cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss,
+ elem, gfp);
+}
+
+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_inform_single_bss_data inform_data = {
+ .drv_data = data,
+ .ftype = ftype,
+ .tsf = tsf,
+ .capability = capability,
+ .beacon_interval = beacon_interval,
+ .ie = ie,
+ .ielen = ielen,
+ };
+ struct cfg80211_bss *res;
+
+ memcpy(inform_data.bssid, bssid, ETH_ALEN);
+
+ res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp);
+ if (!res)
+ return NULL;
+
+ cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
+
+ cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
+
+ return res;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_data);
+
+/* cfg80211_inform_bss_width_frame helper */
+static struct cfg80211_bss *
+cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
+ struct cfg80211_inform_bss *data,
+ struct ieee80211_mgmt *mgmt, size_t len,
+ gfp_t gfp)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss tmp = {}, *res;
+ struct cfg80211_bss_ies *ies;
+ struct ieee80211_channel *channel;
+ bool signal_valid;
+ struct ieee80211_ext *ext = NULL;
+ u8 *bssid, *variable;
+ u16 capability, beacon_int;
+ size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
+ u.probe_resp.variable);
+ int bss_type;
+
+ BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
+ offsetof(struct ieee80211_mgmt, u.beacon.variable));
+
+ trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
+
+ if (WARN_ON(!mgmt))
+ return NULL;
+
+ if (WARN_ON(!wiphy))
+ return NULL;
+
+ if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+ (data->signal < 0 || data->signal > 100)))
+ return NULL;
+
+ if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
+ ext = (void *) mgmt;
+ min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
+ if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
+ min_hdr_len = offsetof(struct ieee80211_ext,
+ u.s1g_short_beacon.variable);
+ }
+
+ if (WARN_ON(len < min_hdr_len))
+ return NULL;
+
+ ielen = len - min_hdr_len;
+ variable = mgmt->u.probe_resp.variable;
+ if (ext) {
+ if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
+ variable = ext->u.s1g_short_beacon.variable;
+ else
+ variable = ext->u.s1g_beacon.variable;
+ }
+
+ channel = cfg80211_get_bss_channel(wiphy, variable,
+ ielen, data->chan, data->scan_width);
+ if (!channel)
+ return NULL;
+
+ if (ext) {
+ const struct ieee80211_s1g_bcn_compat_ie *compat;
+ const struct element *elem;
+
+ elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
+ variable, ielen);
+ if (!elem)
+ return NULL;
+ if (elem->datalen < sizeof(*compat))
+ return NULL;
+ compat = (void *)elem->data;
+ bssid = ext->u.s1g_beacon.sa;
+ capability = le16_to_cpu(compat->compat_info);
+ beacon_int = le16_to_cpu(compat->beacon_int);
+ } else {
+ bssid = mgmt->bssid;
+ beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
+ capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
+ }
+
+ if (channel->band == NL80211_BAND_60GHZ) {
+ bss_type = 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 (capability & WLAN_CAPABILITY_ESS)
+ regulatory_hint_found_beacon(wiphy, channel, gfp);
+ }
+
+ ies = kzalloc(sizeof(*ies) + ielen, gfp);
+ if (!ies)
+ return NULL;
+ ies->len = ielen;
+ ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+ ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
+ ieee80211_is_s1g_beacon(mgmt->frame_control);
+ memcpy(ies->data, variable, ielen);
+
+ if (ieee80211_is_probe_resp(mgmt->frame_control))
+ rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+ else
+ rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+ rcu_assign_pointer(tmp.pub.ies, ies);
+
+ memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
+ tmp.pub.beacon_interval = beacon_int;
+ tmp.pub.capability = capability;
+ tmp.pub.channel = channel;
+ tmp.pub.scan_width = data->scan_width;
+ tmp.pub.signal = data->signal;
+ tmp.ts_boottime = data->boottime_ns;
+ tmp.parent_tsf = data->parent_tsf;
+ tmp.pub.chains = data->chains;
+ memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
+ ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
+
+ signal_valid = data->chan == channel;
+ spin_lock_bh(&rdev->bss_lock);
+ res = __cfg80211_bss_update(rdev, &tmp, signal_valid, jiffies);
+ if (!res)
+ goto drop;
+
+ rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
+
+ spin_unlock_bh(&rdev->bss_lock);
+
+ trace_cfg80211_return_bss(&res->pub);
+ /* __cfg80211_bss_update gives us a referenced result */
+ return &res->pub;
+
+drop:
+ spin_unlock_bh(&rdev->bss_lock);
+ return NULL;
+}
+
+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_inform_single_bss_data inform_data = {
+ .drv_data = data,
+ .ie = mgmt->u.probe_resp.variable,
+ .ielen = len - offsetof(struct ieee80211_mgmt,
+ u.probe_resp.variable),
+ };
+ struct cfg80211_bss *res;
+
+ res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
+ len, gfp);
+ if (!res)
+ return NULL;
+
+ /* don't do any further MBSSID/ML handling for S1G */
+ if (ieee80211_is_s1g_beacon(mgmt->frame_control))
+ return res;
+
+ inform_data.ftype = ieee80211_is_beacon(mgmt->frame_control) ?
+ CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
+ memcpy(inform_data.bssid, mgmt->bssid, ETH_ALEN);
+ inform_data.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+ inform_data.beacon_interval =
+ le16_to_cpu(mgmt->u.probe_resp.beacon_int);
+
+ /* process each non-transmitting bss */
+ cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
+
+ cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, 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);
+
+ if (!pub)
+ return;
+
+ spin_lock_bh(&rdev->bss_lock);
+ bss_ref_get(rdev, bss_from_pub(pub));
+ 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);
+
+ if (!pub)
+ return;
+
+ spin_lock_bh(&rdev->bss_lock);
+ bss_ref_put(rdev, bss_from_pub(pub));
+ 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 = bss_from_pub(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 = bss_from_pub(nontrans_bss);
+ if (__cfg80211_unlink_bss(rdev, tmp1))
+ rdev->bss_generation++;
+ }
+
+ if (__cfg80211_unlink_bss(rdev, bss))
+ rdev->bss_generation++;
+out:
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_unlink_bss);
+
+void cfg80211_bss_iter(struct wiphy *wiphy,
+ struct cfg80211_chan_def *chandef,
+ void (*iter)(struct wiphy *wiphy,
+ struct cfg80211_bss *bss,
+ void *data),
+ void *iter_data)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *bss;
+
+ spin_lock_bh(&rdev->bss_lock);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
+ false))
+ iter(wiphy, &bss->pub, iter_data);
+ }
+
+ spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_bss_iter);
+
+void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
+ unsigned int link_id,
+ struct ieee80211_channel *chan)
+{
+ struct wiphy *wiphy = wdev->wiphy;
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
+ struct cfg80211_internal_bss *new = NULL;
+ struct cfg80211_internal_bss *bss;
+ struct cfg80211_bss *nontrans_bss;
+ struct cfg80211_bss *tmp;
+
+ spin_lock_bh(&rdev->bss_lock);
+
+ /*
+ * Some APs use CSA also for bandwidth changes, i.e., without actually
+ * changing the control channel, so no need to update in such a case.
+ */
+ if (cbss->pub.channel == chan)
+ goto done;
+
+ /* use transmitting bss */
+ if (cbss->pub.transmitted_bss)
+ cbss = bss_from_pub(cbss->pub.transmitted_bss);
+
+ cbss->pub.channel = chan;
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (!cfg80211_bss_type_match(bss->pub.capability,
+ bss->pub.channel->band,
+ wdev->conn_bss_type))
+ continue;
+
+ if (bss == cbss)
+ continue;
+
+ if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
+ new = bss;
+ break;
+ }
+ }
+
+ if (new) {
+ /* to save time, update IEs for transmitting bss only */
+ if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
+ new->pub.proberesp_ies = NULL;
+ new->pub.beacon_ies = NULL;
+ }
+
+ list_for_each_entry_safe(nontrans_bss, tmp,
+ &new->pub.nontrans_list,
+ nontrans_list) {
+ bss = bss_from_pub(nontrans_bss);
+ if (__cfg80211_unlink_bss(rdev, bss))
+ rdev->bss_generation++;
+ }
+
+ WARN_ON(atomic_read(&new->hold));
+ if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
+ rdev->bss_generation++;
+ }
+
+ rb_erase(&cbss->rbn, &rdev->bss_tree);
+ rb_insert_bss(rdev, cbss);
+ rdev->bss_generation++;
+
+ list_for_each_entry_safe(nontrans_bss, tmp,
+ &cbss->pub.nontrans_list,
+ nontrans_list) {
+ bss = bss_from_pub(nontrans_bss);
+ bss->pub.channel = chan;
+ rb_erase(&bss->rbn, &rdev->bss_tree);
+ rb_insert_bss(rdev, bss);
+ rdev->bss_generation++;
+ }
+
+done:
+ spin_unlock_bh(&rdev->bss_lock);
+}
+
+#ifdef CONFIG_CFG80211_WEXT
+static struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
+{
+ struct cfg80211_registered_device *rdev;
+ struct net_device *dev;
+
+ ASSERT_RTNL();
+
+ dev = dev_get_by_index(net, ifindex);
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+ if (dev->ieee80211_ptr)
+ rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
+ else
+ rdev = ERR_PTR(-ENODEV);
+ dev_put(dev);
+ return rdev;
+}
+
+int cfg80211_wext_siwscan(struct net_device *dev,
+ struct iw_request_info *info,
+ union iwreq_data *wrqu, char *extra)
+{
+ struct cfg80211_registered_device *rdev;
+ struct wiphy *wiphy;
+ struct iw_scan_req *wreq = NULL;
+ struct cfg80211_scan_request *creq;
+ int i, err, n_channels = 0;
+ enum nl80211_band band;
+
+ if (!netif_running(dev))
+ return -ENETDOWN;
+
+ if (wrqu->data.length == sizeof(struct iw_scan_req))
+ wreq = (struct iw_scan_req *)extra;
+
+ rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
+
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+
+ if (rdev->scan_req || rdev->scan_msg)
+ return -EBUSY;
+
+ wiphy = &rdev->wiphy;
+
+ /* Determine number of channels, needed to allocate creq */
+ if (wreq && wreq->num_channels)
+ n_channels = wreq->num_channels;
+ else
+ n_channels = ieee80211_get_num_supported_channels(wiphy);
+
+ creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
+ n_channels * sizeof(void *),
+ GFP_ATOMIC);
+ if (!creq)
+ return -ENOMEM;
+
+ creq->wiphy = wiphy;
+ creq->wdev = dev->ieee80211_ptr;
+ /* SSIDs come after channels */
+ creq->ssids = (void *)&creq->channels[n_channels];
+ creq->n_channels = n_channels;
+ creq->n_ssids = 1;
+ creq->scan_start = jiffies;
+
+ /* translate "Scan on frequencies" request */
+ i = 0;
+ for (band = 0; band < NUM_NL80211_BANDS; band++) {
+ int j;
+
+ if (!wiphy->bands[band])
+ continue;
+
+ for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
+ /* ignore disabled channels */
+ if (wiphy->bands[band]->channels[j].flags &
+ IEEE80211_CHAN_DISABLED)
+ continue;
+
+ /* If we have a wireless request structure and the
+ * wireless request specifies frequencies, then search
+ * for the matching hardware channel.
+ */
+ if (wreq && wreq->num_channels) {
+ int k;
+ int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
+ for (k = 0; k < wreq->num_channels; k++) {
+ struct iw_freq *freq =
+ &wreq->channel_list[k];
+ int wext_freq =
+ cfg80211_wext_freq(freq);
+
+ if (wext_freq == wiphy_freq)
+ goto wext_freq_found;
+ }
+ goto wext_freq_not_found;
+ }
+
+ wext_freq_found:
+ creq->channels[i] = &wiphy->bands[band]->channels[j];
+ i++;
+ wext_freq_not_found: ;
+ }
+ }
+ /* No channels found? */
+ if (!i) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Set real number of channels specified in creq->channels[] */
+ creq->n_channels = i;
+
+ /* translate "Scan for SSID" request */
+ if (wreq) {
+ if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
+ if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
+ err = -EINVAL;
+ goto out;
+ }
+ memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
+ creq->ssids[0].ssid_len = wreq->essid_len;
+ }
+ if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
+ creq->n_ssids = 0;
+ }
+
+ for (i = 0; i < NUM_NL80211_BANDS; i++)
+ if (wiphy->bands[i])
+ creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
+
+ eth_broadcast_addr(creq->bssid);
+
+ wiphy_lock(&rdev->wiphy);
+
+ rdev->scan_req = creq;
+ err = rdev_scan(rdev, creq);
+ if (err) {
+ rdev->scan_req = NULL;
+ /* creq will be freed below */
+ } else {
+ nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
+ /* creq now owned by driver */
+ creq = NULL;
+ dev_hold(dev);
+ }
+ wiphy_unlock(&rdev->wiphy);
+ out:
+ kfree(creq);
+ return err;
+}
+EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
+
+static char *ieee80211_scan_add_ies(struct iw_request_info *info,
+ const struct cfg80211_bss_ies *ies,
+ char *current_ev, char *end_buf)
+{
+ const u8 *pos, *end, *next;
+ struct iw_event iwe;
+
+ if (!ies)
+ return current_ev;
+
+ /*
+ * If needed, fragment the IEs buffer (at IE boundaries) into short
+ * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
+ */
+ pos = ies->data;
+ end = pos + ies->len;
+
+ while (end - pos > IW_GENERIC_IE_MAX) {
+ next = pos + 2 + pos[1];
+ while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
+ next = next + 2 + next[1];
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVGENIE;
+ iwe.u.data.length = next - pos;
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ pos = next;
+ }
+
+ if (end > pos) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVGENIE;
+ iwe.u.data.length = end - pos;
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ }
+
+ return current_ev;
+}
+
+static char *
+ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
+ struct cfg80211_internal_bss *bss, char *current_ev,
+ char *end_buf)
+{
+ const struct cfg80211_bss_ies *ies;
+ struct iw_event iwe;
+ const u8 *ie;
+ u8 buf[50];
+ u8 *cfg, *p, *tmp;
+ int rem, i, sig;
+ bool ismesh = false;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWAP;
+ iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
+ memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_ADDR_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWFREQ;
+ iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
+ iwe.u.freq.e = 0;
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWFREQ;
+ iwe.u.freq.m = bss->pub.channel->center_freq;
+ iwe.u.freq.e = 6;
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVQUAL;
+ iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
+ IW_QUAL_NOISE_INVALID |
+ IW_QUAL_QUAL_UPDATED;
+ switch (wiphy->signal_type) {
+ case CFG80211_SIGNAL_TYPE_MBM:
+ sig = bss->pub.signal / 100;
+ iwe.u.qual.level = sig;
+ iwe.u.qual.updated |= IW_QUAL_DBM;
+ if (sig < -110) /* rather bad */
+ sig = -110;
+ else if (sig > -40) /* perfect */
+ sig = -40;
+ /* will give a range of 0 .. 70 */
+ iwe.u.qual.qual = sig + 110;
+ break;
+ case CFG80211_SIGNAL_TYPE_UNSPEC:
+ iwe.u.qual.level = bss->pub.signal;
+ /* will give range 0 .. 100 */
+ iwe.u.qual.qual = bss->pub.signal;
+ break;
+ default:
+ /* not reached */
+ break;
+ }
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_QUAL_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
+ }
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWENCODE;
+ if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
+ iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
+ else
+ iwe.u.data.flags = IW_ENCODE_DISABLED;
+ iwe.u.data.length = 0;
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, "");
+ if (IS_ERR(current_ev))
+ return current_ev;
+
+ rcu_read_lock();
+ ies = rcu_dereference(bss->pub.ies);
+ rem = ies->len;
+ ie = ies->data;
+
+ while (rem >= 2) {
+ /* invalid data */
+ if (ie[1] > rem - 2)
+ break;
+
+ switch (ie[0]) {
+ case WLAN_EID_SSID:
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWESSID;
+ iwe.u.data.length = ie[1];
+ iwe.u.data.flags = 1;
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_MESH_ID:
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWESSID;
+ iwe.u.data.length = ie[1];
+ iwe.u.data.flags = 1;
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_MESH_CONFIG:
+ ismesh = true;
+ if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
+ break;
+ cfg = (u8 *)ie + 2;
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, "Mesh Network Path Selection Protocol ID: "
+ "0x%02X", cfg[0]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Path Selection Metric ID: 0x%02X",
+ cfg[1]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Congestion Control Mode ID: 0x%02X",
+ cfg[2]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ break;
+ case WLAN_EID_SUPP_RATES:
+ case WLAN_EID_EXT_SUPP_RATES:
+ /* display all supported rates in readable format */
+ p = current_ev + iwe_stream_lcp_len(info);
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWRATE;
+ /* Those two flags are ignored... */
+ iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
+
+ for (i = 0; i < ie[1]; i++) {
+ iwe.u.bitrate.value =
+ ((ie[i + 2] & 0x7f) * 500000);
+ tmp = p;
+ p = iwe_stream_add_value(info, current_ev, p,
+ end_buf, &iwe,
+ IW_EV_PARAM_LEN);
+ if (p == tmp) {
+ current_ev = ERR_PTR(-E2BIG);
+ goto unlock;
+ }
+ }
+ current_ev = p;
+ break;
+ }
+ rem -= ie[1] + 2;
+ ie += ie[1] + 2;
+ }
+
+ if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
+ ismesh) {
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = SIOCGIWMODE;
+ if (ismesh)
+ iwe.u.mode = IW_MODE_MESH;
+ else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
+ iwe.u.mode = IW_MODE_MASTER;
+ else
+ iwe.u.mode = IW_MODE_ADHOC;
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_UINT_LEN);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ }
+
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, " Last beacon: %ums ago",
+ elapsed_jiffies_msecs(bss->ts));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+
+ current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
+
+ unlock:
+ rcu_read_unlock();
+ return current_ev;
+}
+
+
+static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
+ struct iw_request_info *info,
+ char *buf, size_t len)
+{
+ char *current_ev = buf;
+ char *end_buf = buf + len;
+ struct cfg80211_internal_bss *bss;
+ int err = 0;
+
+ spin_lock_bh(&rdev->bss_lock);
+ cfg80211_bss_expire(rdev);
+
+ list_for_each_entry(bss, &rdev->bss_list, list) {
+ if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
+ err = -E2BIG;
+ break;
+ }
+ current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
+ current_ev, end_buf);
+ if (IS_ERR(current_ev)) {
+ err = PTR_ERR(current_ev);
+ break;
+ }
+ }
+ spin_unlock_bh(&rdev->bss_lock);
+
+ if (err)
+ return err;
+ return current_ev - buf;
+}
+
+
+int cfg80211_wext_giwscan(struct net_device *dev,
+ struct iw_request_info *info,
+ union iwreq_data *wrqu, char *extra)
+{
+ struct iw_point *data = &wrqu->data;
+ 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