linux/net/wireless/mlme.c
Veerendranath Jakkam 6933486133 wifi: nl80211: Add support for randomizing TA of auth and deauth frames
Add support to use a random local address in authentication and
deauthentication frames sent to unassociated peer when the driver
supports.

The driver needs to configure receive behavior to accept frames with
random transmit address specified in TX path authentication frames
during the time of the frame exchange is pending and such frames need to
be acknowledged similarly to frames sent to the local permanent address
when this random address functionality is used.

This capability allows use of randomized transmit address for PASN
authentication frames to improve privacy of WLAN clients.

Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Link: https://lore.kernel.org/r/20230112012415.167556-2-quic_vjakkam@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2023-03-07 11:12:02 +01:00

1172 lines
31 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* cfg80211 MLME SAP interface
*
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
* Copyright (c) 2015 Intel Deutschland GmbH
* Copyright (C) 2019-2020, 2022 Intel Corporation
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/nl80211.h>
#include <linux/slab.h>
#include <linux/wireless.h>
#include <net/cfg80211.h>
#include <net/iw_handler.h>
#include "core.h"
#include "nl80211.h"
#include "rdev-ops.h"
void cfg80211_rx_assoc_resp(struct net_device *dev,
struct cfg80211_rx_assoc_resp *data)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)data->buf;
struct cfg80211_connect_resp_params cr = {
.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED,
.req_ie = data->req_ies,
.req_ie_len = data->req_ies_len,
.resp_ie = mgmt->u.assoc_resp.variable,
.resp_ie_len = data->len -
offsetof(struct ieee80211_mgmt,
u.assoc_resp.variable),
.status = le16_to_cpu(mgmt->u.assoc_resp.status_code),
.ap_mld_addr = data->ap_mld_addr,
};
unsigned int link_id;
for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
cr.links[link_id].status = data->links[link_id].status;
WARN_ON_ONCE(cr.links[link_id].status != WLAN_STATUS_SUCCESS &&
(!cr.ap_mld_addr || !cr.links[link_id].bss));
cr.links[link_id].bss = data->links[link_id].bss;
if (!cr.links[link_id].bss)
continue;
cr.links[link_id].bssid = data->links[link_id].bss->bssid;
cr.links[link_id].addr = data->links[link_id].addr;
/* need to have local link addresses for MLO connections */
WARN_ON(cr.ap_mld_addr && !cr.links[link_id].addr);
BUG_ON(!cr.links[link_id].bss->channel);
if (cr.links[link_id].bss->channel->band == NL80211_BAND_S1GHZ) {
WARN_ON(link_id);
cr.resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable;
cr.resp_ie_len = data->len -
offsetof(struct ieee80211_mgmt,
u.s1g_assoc_resp.variable);
}
if (cr.ap_mld_addr)
cr.valid_links |= BIT(link_id);
}
trace_cfg80211_send_rx_assoc(dev, data);
/*
* This is a bit of a hack, we don't notify userspace of
* a (re-)association reply if we tried to send a reassoc
* and got a reject -- we only try again with an assoc
* frame instead of reassoc.
*/
if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
struct cfg80211_bss *bss = data->links[link_id].bss;
if (!bss)
continue;
cfg80211_unhold_bss(bss_from_pub(bss));
cfg80211_put_bss(wiphy, bss);
}
return;
}
nl80211_send_rx_assoc(rdev, dev, data);
/* update current_bss etc., consumes the bss reference */
__cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
}
EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
static void cfg80211_process_auth(struct wireless_dev *wdev,
const u8 *buf, size_t len)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
cfg80211_sme_rx_auth(wdev, buf, len);
}
static void cfg80211_process_deauth(struct wireless_dev *wdev,
const u8 *buf, size_t len,
bool reconnect)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
const u8 *bssid = mgmt->bssid;
u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL);
if (!wdev->connected || !ether_addr_equal(wdev->u.client.connected_addr, bssid))
return;
__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
cfg80211_sme_deauth(wdev);
}
static void cfg80211_process_disassoc(struct wireless_dev *wdev,
const u8 *buf, size_t len,
bool reconnect)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
const u8 *bssid = mgmt->bssid;
u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect,
GFP_KERNEL);
if (WARN_ON(!wdev->connected ||
!ether_addr_equal(wdev->u.client.connected_addr, bssid)))
return;
__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
cfg80211_sme_disassoc(wdev);
}
void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct ieee80211_mgmt *mgmt = (void *)buf;
ASSERT_WDEV_LOCK(wdev);
trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
if (WARN_ON(len < 2))
return;
if (ieee80211_is_auth(mgmt->frame_control))
cfg80211_process_auth(wdev, buf, len);
else if (ieee80211_is_deauth(mgmt->frame_control))
cfg80211_process_deauth(wdev, buf, len, false);
else if (ieee80211_is_disassoc(mgmt->frame_control))
cfg80211_process_disassoc(wdev, buf, len, false);
}
EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
trace_cfg80211_send_auth_timeout(dev, addr);
nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
cfg80211_sme_auth_timeout(wdev);
}
EXPORT_SYMBOL(cfg80211_auth_timeout);
void cfg80211_assoc_failure(struct net_device *dev,
struct cfg80211_assoc_failure *data)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
const u8 *addr = data->ap_mld_addr ?: data->bss[0]->bssid;
int i;
trace_cfg80211_send_assoc_failure(dev, data);
if (data->timeout) {
nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
cfg80211_sme_assoc_timeout(wdev);
} else {
cfg80211_sme_abandon_assoc(wdev);
}
for (i = 0; i < ARRAY_SIZE(data->bss); i++) {
struct cfg80211_bss *bss = data->bss[i];
if (!bss)
continue;
cfg80211_unhold_bss(bss_from_pub(bss));
cfg80211_put_bss(wiphy, bss);
}
}
EXPORT_SYMBOL(cfg80211_assoc_failure);
void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len,
bool reconnect)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct ieee80211_mgmt *mgmt = (void *)buf;
ASSERT_WDEV_LOCK(wdev);
trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect);
if (WARN_ON(len < 2))
return;
if (ieee80211_is_deauth(mgmt->frame_control))
cfg80211_process_deauth(wdev, buf, len, reconnect);
else
cfg80211_process_disassoc(wdev, buf, len, reconnect);
}
EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
enum nl80211_key_type key_type, int key_id,
const u8 *tsc, gfp_t gfp)
{
struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
#ifdef CONFIG_CFG80211_WEXT
union iwreq_data wrqu;
char *buf = kmalloc(128, gfp);
if (buf) {
sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
"keyid=%d %scast addr=%pM)", key_id,
key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
addr);
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = strlen(buf);
wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
kfree(buf);
}
#endif
trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
}
EXPORT_SYMBOL(cfg80211_michael_mic_failure);
/* some MLME handling for userspace SME */
int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_auth_request *req)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
ASSERT_WDEV_LOCK(wdev);
if (!req->bss)
return -ENOENT;
if (req->link_id >= 0 &&
!(wdev->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO))
return -EINVAL;
if (req->auth_type == NL80211_AUTHTYPE_SHARED_KEY) {
if (!req->key || !req->key_len ||
req->key_idx < 0 || req->key_idx > 3)
return -EINVAL;
}
if (wdev->connected &&
ether_addr_equal(req->bss->bssid, wdev->u.client.connected_addr))
return -EALREADY;
return rdev_auth(rdev, dev, req);
}
/* Do a logical ht_capa &= ht_capa_mask. */
void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
const struct ieee80211_ht_cap *ht_capa_mask)
{
int i;
u8 *p1, *p2;
if (!ht_capa_mask) {
memset(ht_capa, 0, sizeof(*ht_capa));
return;
}
p1 = (u8*)(ht_capa);
p2 = (u8*)(ht_capa_mask);
for (i = 0; i < sizeof(*ht_capa); i++)
p1[i] &= p2[i];
}
/* Do a logical vht_capa &= vht_capa_mask. */
void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
const struct ieee80211_vht_cap *vht_capa_mask)
{
int i;
u8 *p1, *p2;
if (!vht_capa_mask) {
memset(vht_capa, 0, sizeof(*vht_capa));
return;
}
p1 = (u8*)(vht_capa);
p2 = (u8*)(vht_capa_mask);
for (i = 0; i < sizeof(*vht_capa); i++)
p1[i] &= p2[i];
}
/* Note: caller must cfg80211_put_bss() regardless of result */
int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_assoc_request *req)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
int err, i, j;
ASSERT_WDEV_LOCK(wdev);
for (i = 1; i < ARRAY_SIZE(req->links); i++) {
if (!req->links[i].bss)
continue;
for (j = 0; j < i; j++) {
if (req->links[i].bss == req->links[j].bss)
return -EINVAL;
}
}
if (wdev->connected &&
(!req->prev_bssid ||
!ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid)))
return -EALREADY;
cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
rdev->wiphy.ht_capa_mod_mask);
cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
rdev->wiphy.vht_capa_mod_mask);
err = rdev_assoc(rdev, dev, req);
if (!err) {
int link_id;
if (req->bss) {
cfg80211_ref_bss(&rdev->wiphy, req->bss);
cfg80211_hold_bss(bss_from_pub(req->bss));
}
for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) {
if (!req->links[link_id].bss)
continue;
cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss);
cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss));
}
}
return err;
}
int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason,
bool local_state_change)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_deauth_request req = {
.bssid = bssid,
.reason_code = reason,
.ie = ie,
.ie_len = ie_len,
.local_state_change = local_state_change,
};
ASSERT_WDEV_LOCK(wdev);
if (local_state_change &&
(!wdev->connected ||
!ether_addr_equal(wdev->u.client.connected_addr, bssid)))
return 0;
if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
(wdev->connected &&
ether_addr_equal(wdev->u.client.connected_addr, bssid)))
wdev->conn_owner_nlportid = 0;
return rdev_deauth(rdev, dev, &req);
}
int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *ap_addr,
const u8 *ie, int ie_len, u16 reason,
bool local_state_change)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_disassoc_request req = {
.reason_code = reason,
.local_state_change = local_state_change,
.ie = ie,
.ie_len = ie_len,
.ap_addr = ap_addr,
};
int err;
ASSERT_WDEV_LOCK(wdev);
if (!wdev->connected)
return -ENOTCONN;
if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN))
return -ENOTCONN;
err = rdev_disassoc(rdev, dev, &req);
if (err)
return err;
/* driver should have reported the disassoc */
WARN_ON(wdev->connected);
return 0;
}
void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
struct net_device *dev)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
u8 bssid[ETH_ALEN];
ASSERT_WDEV_LOCK(wdev);
if (!rdev->ops->deauth)
return;
if (!wdev->connected)
return;
memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN);
cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
WLAN_REASON_DEAUTH_LEAVING, false);
}
struct cfg80211_mgmt_registration {
struct list_head list;
struct wireless_dev *wdev;
u32 nlportid;
int match_len;
__le16 frame_type;
bool multicast_rx;
u8 match[];
};
static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct wireless_dev *tmp;
struct cfg80211_mgmt_registration *reg;
struct mgmt_frame_regs upd = {};
lockdep_assert_held(&rdev->wiphy.mtx);
spin_lock_bh(&rdev->mgmt_registrations_lock);
if (!wdev->mgmt_registrations_need_update) {
spin_unlock_bh(&rdev->mgmt_registrations_lock);
return;
}
rcu_read_lock();
list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
u32 mcast_mask = 0;
if (reg->multicast_rx)
mcast_mask = mask;
upd.global_stypes |= mask;
upd.global_mcast_stypes |= mcast_mask;
if (tmp == wdev) {
upd.interface_stypes |= mask;
upd.interface_mcast_stypes |= mcast_mask;
}
}
}
rcu_read_unlock();
wdev->mgmt_registrations_need_update = 0;
spin_unlock_bh(&rdev->mgmt_registrations_lock);
rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
}
void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
{
struct cfg80211_registered_device *rdev;
struct wireless_dev *wdev;
rdev = container_of(wk, struct cfg80211_registered_device,
mgmt_registrations_update_wk);
wiphy_lock(&rdev->wiphy);
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
cfg80211_mgmt_registrations_update(wdev);
wiphy_unlock(&rdev->wiphy);
}
int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
u16 frame_type, const u8 *match_data,
int match_len, bool multicast_rx,
struct netlink_ext_ack *extack)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct cfg80211_mgmt_registration *reg, *nreg;
int err = 0;
u16 mgmt_type;
bool update_multicast = false;
if (!wdev->wiphy->mgmt_stypes)
return -EOPNOTSUPP;
if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
NL_SET_ERR_MSG(extack, "frame type not management");
return -EINVAL;
}
if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
NL_SET_ERR_MSG(extack, "Invalid frame type");
return -EINVAL;
}
mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
NL_SET_ERR_MSG(extack,
"Registration to specific type not supported");
return -EINVAL;
}
/*
* To support Pre Association Security Negotiation (PASN), registration
* for authentication frames should be supported. However, as some
* versions of the user space daemons wrongly register to all types of
* authentication frames (which might result in unexpected behavior)
* allow such registration if the request is for a specific
* authentication algorithm number.
*/
if (wdev->iftype == NL80211_IFTYPE_STATION &&
(frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
!(match_data && match_len >= 2)) {
NL_SET_ERR_MSG(extack,
"Authentication algorithm number required");
return -EINVAL;
}
nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
if (!nreg)
return -ENOMEM;
spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
int mlen = min(match_len, reg->match_len);
if (frame_type != le16_to_cpu(reg->frame_type))
continue;
if (memcmp(reg->match, match_data, mlen) == 0) {
if (reg->multicast_rx != multicast_rx) {
update_multicast = true;
reg->multicast_rx = multicast_rx;
break;
}
NL_SET_ERR_MSG(extack, "Match already configured");
err = -EALREADY;
break;
}
}
if (err)
goto out;
if (update_multicast) {
kfree(nreg);
} else {
memcpy(nreg->match, match_data, match_len);
nreg->match_len = match_len;
nreg->nlportid = snd_portid;
nreg->frame_type = cpu_to_le16(frame_type);
nreg->wdev = wdev;
nreg->multicast_rx = multicast_rx;
list_add(&nreg->list, &wdev->mgmt_registrations);
}
wdev->mgmt_registrations_need_update = 1;
spin_unlock_bh(&rdev->mgmt_registrations_lock);
cfg80211_mgmt_registrations_update(wdev);
return 0;
out:
kfree(nreg);
spin_unlock_bh(&rdev->mgmt_registrations_lock);
return err;
}
void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
{
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct cfg80211_mgmt_registration *reg, *tmp;
spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
if (reg->nlportid != nlportid)
continue;
list_del(&reg->list);
kfree(reg);
wdev->mgmt_registrations_need_update = 1;
schedule_work(&rdev->mgmt_registrations_update_wk);
}
spin_unlock_bh(&rdev->mgmt_registrations_lock);
if (nlportid && rdev->crit_proto_nlportid == nlportid) {
rdev->crit_proto_nlportid = 0;
rdev_crit_proto_stop(rdev, wdev);
}
if (nlportid == wdev->ap_unexpected_nlportid)
wdev->ap_unexpected_nlportid = 0;
}
void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct cfg80211_mgmt_registration *reg, *tmp;
spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
list_del(&reg->list);
kfree(reg);
}
wdev->mgmt_registrations_need_update = 1;
spin_unlock_bh(&rdev->mgmt_registrations_lock);
cfg80211_mgmt_registrations_update(wdev);
}
static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr)
{
int i;
for_each_valid_link(wdev, i) {
if (ether_addr_equal(addr, wdev->links[i].addr))
return true;
}
return ether_addr_equal(addr, wdev_address(wdev));
}
static bool cfg80211_allowed_random_address(struct wireless_dev *wdev,
const struct ieee80211_mgmt *mgmt)
{
if (ieee80211_is_auth(mgmt->frame_control) ||
ieee80211_is_deauth(mgmt->frame_control)) {
/* Allow random TA to be used with authentication and
* deauthentication frames if the driver has indicated support.
*/
if (wiphy_ext_feature_isset(
wdev->wiphy,
NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA))
return true;
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
/* Allow random TA to be used with Public Action frames if the
* driver has indicated support.
*/
if (!wdev->connected &&
wiphy_ext_feature_isset(
wdev->wiphy,
NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
return true;
if (wdev->connected &&
wiphy_ext_feature_isset(
wdev->wiphy,
NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
return true;
}
return false;
}
int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct cfg80211_mgmt_tx_params *params, u64 *cookie)
{
const struct ieee80211_mgmt *mgmt;
u16 stype;
if (!wdev->wiphy->mgmt_stypes)
return -EOPNOTSUPP;
if (!rdev->ops->mgmt_tx)
return -EOPNOTSUPP;
if (params->len < 24 + 1)
return -EINVAL;
mgmt = (const struct ieee80211_mgmt *)params->buf;
if (!ieee80211_is_mgmt(mgmt->frame_control))
return -EINVAL;
stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
return -EINVAL;
if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
int err = 0;
wdev_lock(wdev);
switch (wdev->iftype) {
case NL80211_IFTYPE_ADHOC:
/*
* check for IBSS DA must be done by driver as
* cfg80211 doesn't track the stations
*/
if (!wdev->u.ibss.current_bss ||
!ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
mgmt->bssid)) {
err = -ENOTCONN;
break;
}
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
if (!wdev->connected) {
err = -ENOTCONN;
break;
}
/* FIXME: MLD may address this differently */
if (!ether_addr_equal(wdev->u.client.connected_addr,
mgmt->bssid)) {
err = -ENOTCONN;
break;
}
/* for station, check that DA is the AP */
if (!ether_addr_equal(wdev->u.client.connected_addr,
mgmt->da)) {
err = -ENOTCONN;
break;
}
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_AP_VLAN:
if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) &&
(params->link_id < 0 ||
!ether_addr_equal(mgmt->bssid,
wdev->links[params->link_id].addr)))
err = -EINVAL;
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
err = -EINVAL;
break;
}
/*
* check for mesh DA must be done by driver as
* cfg80211 doesn't track the stations
*/
break;
case NL80211_IFTYPE_P2P_DEVICE:
/*
* fall through, P2P device only supports
* public action frames
*/
case NL80211_IFTYPE_NAN:
default:
err = -EOPNOTSUPP;
break;
}
wdev_unlock(wdev);
if (err)
return err;
}
if (!cfg80211_allowed_address(wdev, mgmt->sa) &&
!cfg80211_allowed_random_address(wdev, mgmt))
return -EINVAL;
/* Transmit the management frame as requested by user space */
return rdev_mgmt_tx(rdev, wdev, params, cookie);
}
bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev,
struct cfg80211_rx_info *info)
{
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct cfg80211_mgmt_registration *reg;
const struct ieee80211_txrx_stypes *stypes =
&wiphy->mgmt_stypes[wdev->iftype];
struct ieee80211_mgmt *mgmt = (void *)info->buf;
const u8 *data;
int data_len;
bool result = false;
__le16 ftype = mgmt->frame_control &
cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
u16 stype;
trace_cfg80211_rx_mgmt(wdev, info);
stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
if (!(stypes->rx & BIT(stype))) {
trace_cfg80211_return_bool(false);
return false;
}
data = info->buf + ieee80211_hdrlen(mgmt->frame_control);
data_len = info->len - ieee80211_hdrlen(mgmt->frame_control);
spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
if (reg->frame_type != ftype)
continue;
if (reg->match_len > data_len)
continue;
if (memcmp(reg->match, data, reg->match_len))
continue;
/* found match! */
/* Indicate the received Action frame to user space */
if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info,
GFP_ATOMIC))
continue;
result = true;
break;
}
spin_unlock_bh(&rdev->mgmt_registrations_lock);
trace_cfg80211_return_bool(result);
return result;
}
EXPORT_SYMBOL(cfg80211_rx_mgmt_ext);
void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
{
cancel_delayed_work(&rdev->dfs_update_channels_wk);
queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
}
void cfg80211_dfs_channels_update_work(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct cfg80211_registered_device *rdev;
struct cfg80211_chan_def chandef;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *c;
struct wiphy *wiphy;
bool check_again = false;
unsigned long timeout, next_time = 0;
unsigned long time_dfs_update;
enum nl80211_radar_event radar_event;
int bandid, i;
rdev = container_of(delayed_work, struct cfg80211_registered_device,
dfs_update_channels_wk);
wiphy = &rdev->wiphy;
rtnl_lock();
for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
sband = wiphy->bands[bandid];
if (!sband)
continue;
for (i = 0; i < sband->n_channels; i++) {
c = &sband->channels[i];
if (!(c->flags & IEEE80211_CHAN_RADAR))
continue;
if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
c->dfs_state != NL80211_DFS_AVAILABLE)
continue;
if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
radar_event = NL80211_RADAR_NOP_FINISHED;
} else {
if (regulatory_pre_cac_allowed(wiphy) ||
cfg80211_any_wiphy_oper_chan(wiphy, c))
continue;
time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
}
timeout = c->dfs_state_entered +
msecs_to_jiffies(time_dfs_update);
if (time_after_eq(jiffies, timeout)) {
c->dfs_state = NL80211_DFS_USABLE;
c->dfs_state_entered = jiffies;
cfg80211_chandef_create(&chandef, c,
NL80211_CHAN_NO_HT);
nl80211_radar_notify(rdev, &chandef,
radar_event, NULL,
GFP_ATOMIC);
regulatory_propagate_dfs_state(wiphy, &chandef,
c->dfs_state,
radar_event);
continue;
}
if (!check_again)
next_time = timeout - jiffies;
else
next_time = min(next_time, timeout - jiffies);
check_again = true;
}
}
rtnl_unlock();
/* reschedule if there are other channels waiting to be cleared again */
if (check_again)
queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
next_time);
}
void __cfg80211_radar_event(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
bool offchan, gfp_t gfp)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
trace_cfg80211_radar_event(wiphy, chandef, offchan);
/* only set the chandef supplied channel to unavailable, in
* case the radar is detected on only one of multiple channels
* spanned by the chandef.
*/
cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
if (offchan)
queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
cfg80211_sched_dfs_chan_update(rdev);
nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
}
EXPORT_SYMBOL(__cfg80211_radar_event);
void cfg80211_cac_event(struct net_device *netdev,
const struct cfg80211_chan_def *chandef,
enum nl80211_radar_event event, gfp_t gfp)
{
struct wireless_dev *wdev = netdev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
unsigned long timeout;
/* not yet supported */
if (wdev->valid_links)
return;
trace_cfg80211_cac_event(netdev, event);
if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
return;
switch (event) {
case NL80211_RADAR_CAC_FINISHED:
timeout = wdev->cac_start_time +
msecs_to_jiffies(wdev->cac_time_ms);
WARN_ON(!time_after_eq(jiffies, timeout));
cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
memcpy(&rdev->cac_done_chandef, chandef,
sizeof(struct cfg80211_chan_def));
queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
cfg80211_sched_dfs_chan_update(rdev);
fallthrough;
case NL80211_RADAR_CAC_ABORTED:
wdev->cac_started = false;
break;
case NL80211_RADAR_CAC_STARTED:
wdev->cac_started = true;
break;
default:
WARN_ON(1);
return;
}
nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
}
EXPORT_SYMBOL(cfg80211_cac_event);
static void
__cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
const struct cfg80211_chan_def *chandef,
enum nl80211_radar_event event)
{
struct wiphy *wiphy = &rdev->wiphy;
struct net_device *netdev;
lockdep_assert_wiphy(&rdev->wiphy);
if (!cfg80211_chandef_valid(chandef))
return;
if (!rdev->background_radar_wdev)
return;
switch (event) {
case NL80211_RADAR_CAC_FINISHED:
cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
cfg80211_sched_dfs_chan_update(rdev);
wdev = rdev->background_radar_wdev;
break;
case NL80211_RADAR_CAC_ABORTED:
if (!cancel_delayed_work(&rdev->background_cac_done_wk))
return;
wdev = rdev->background_radar_wdev;
break;
case NL80211_RADAR_CAC_STARTED:
break;
default:
return;
}
netdev = wdev ? wdev->netdev : NULL;
nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
}
static void
cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
const struct cfg80211_chan_def *chandef,
enum nl80211_radar_event event)
{
wiphy_lock(&rdev->wiphy);
__cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
chandef, event);
wiphy_unlock(&rdev->wiphy);
}
void cfg80211_background_cac_done_wk(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct cfg80211_registered_device *rdev;
rdev = container_of(delayed_work, struct cfg80211_registered_device,
background_cac_done_wk);
cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
NL80211_RADAR_CAC_FINISHED);
}
void cfg80211_background_cac_abort_wk(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device,
background_cac_abort_wk);
cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
NL80211_RADAR_CAC_ABORTED);
}
void cfg80211_background_cac_abort(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
}
EXPORT_SYMBOL(cfg80211_background_cac_abort);
int
cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct cfg80211_chan_def *chandef)
{
unsigned int cac_time_ms;
int err;
lockdep_assert_wiphy(&rdev->wiphy);
if (!wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_RADAR_BACKGROUND))
return -EOPNOTSUPP;
/* Offchannel chain already locked by another wdev */
if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
return -EBUSY;
/* CAC already in progress on the offchannel chain */
if (rdev->background_radar_wdev == wdev &&
delayed_work_pending(&rdev->background_cac_done_wk))
return -EBUSY;
err = rdev_set_radar_background(rdev, chandef);
if (err)
return err;
cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
if (!cac_time_ms)
cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
rdev->background_radar_chandef = *chandef;
rdev->background_radar_wdev = wdev; /* Get offchain ownership */
__cfg80211_background_cac_event(rdev, wdev, chandef,
NL80211_RADAR_CAC_STARTED);
queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
msecs_to_jiffies(cac_time_ms));
return 0;
}
void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
{
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
lockdep_assert_wiphy(wiphy);
if (wdev != rdev->background_radar_wdev)
return;
rdev_set_radar_background(rdev, NULL);
rdev->background_radar_wdev = NULL; /* Release offchain ownership */
__cfg80211_background_cac_event(rdev, wdev,
&rdev->background_radar_chandef,
NL80211_RADAR_CAC_ABORTED);
}