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cfg.c
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cfg.c
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/*
* mac80211 configuration hooks for cfg80211
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2015 Intel Mobile Communications GmbH
* Copyright (C) 2015-2017 Intel Deutschland GmbH
*
* This file is GPLv2 as found in COPYING.
*/
#include <linux/ieee80211.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <linux/rcupdate.h>
#include <linux/if_ether.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wme.h"
static void ieee80211_set_mu_mimo_follow(struct ieee80211_sub_if_data *sdata,
struct vif_params *params)
{
bool mu_mimo_groups = false;
bool mu_mimo_follow = false;
if (params->vht_mumimo_groups) {
u64 membership;
BUILD_BUG_ON(sizeof(membership) != WLAN_MEMBERSHIP_LEN);
memcpy(sdata->vif.bss_conf.mu_group.membership,
params->vht_mumimo_groups, WLAN_MEMBERSHIP_LEN);
memcpy(sdata->vif.bss_conf.mu_group.position,
params->vht_mumimo_groups + WLAN_MEMBERSHIP_LEN,
WLAN_USER_POSITION_LEN);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_MU_GROUPS);
/* don't care about endianness - just check for 0 */
memcpy(&membership, params->vht_mumimo_groups,
WLAN_MEMBERSHIP_LEN);
mu_mimo_groups = membership != 0;
}
if (params->vht_mumimo_follow_addr) {
mu_mimo_follow =
is_valid_ether_addr(params->vht_mumimo_follow_addr);
ether_addr_copy(sdata->u.mntr.mu_follow_addr,
params->vht_mumimo_follow_addr);
}
sdata->vif.mu_mimo_owner = mu_mimo_groups || mu_mimo_follow;
}
static int ieee80211_set_mon_options(struct ieee80211_sub_if_data *sdata,
struct vif_params *params)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *monitor_sdata;
/* check flags first */
if (params->flags && ieee80211_sdata_running(sdata)) {
u32 mask = MONITOR_FLAG_COOK_FRAMES | MONITOR_FLAG_ACTIVE;
/*
* Prohibit MONITOR_FLAG_COOK_FRAMES and
* MONITOR_FLAG_ACTIVE to be changed while the
* interface is up.
* Else we would need to add a lot of cruft
* to update everything:
* cooked_mntrs, monitor and all fif_* counters
* reconfigure hardware
*/
if ((params->flags & mask) != (sdata->u.mntr.flags & mask))
return -EBUSY;
}
/* also validate MU-MIMO change */
monitor_sdata = rtnl_dereference(local->monitor_sdata);
if (!monitor_sdata &&
(params->vht_mumimo_groups || params->vht_mumimo_follow_addr))
return -EOPNOTSUPP;
/* apply all changes now - no failures allowed */
if (monitor_sdata)
ieee80211_set_mu_mimo_follow(monitor_sdata, params);
if (params->flags) {
if (ieee80211_sdata_running(sdata)) {
ieee80211_adjust_monitor_flags(sdata, -1);
sdata->u.mntr.flags = params->flags;
ieee80211_adjust_monitor_flags(sdata, 1);
ieee80211_configure_filter(local);
} else {
/*
* Because the interface is down, ieee80211_do_stop
* and ieee80211_do_open take care of "everything"
* mentioned in the comment above.
*/
sdata->u.mntr.flags = params->flags;
}
}
return 0;
}
static struct wireless_dev *ieee80211_add_iface(struct wiphy *wiphy,
const char *name,
unsigned char name_assign_type,
enum nl80211_iftype type,
struct vif_params *params)
{
struct ieee80211_local *local = wiphy_priv(wiphy);
struct wireless_dev *wdev;
struct ieee80211_sub_if_data *sdata;
int err;
err = ieee80211_if_add(local, name, name_assign_type, &wdev, type, params);
if (err)
return ERR_PTR(err);
sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
if (type == NL80211_IFTYPE_MONITOR) {
err = ieee80211_set_mon_options(sdata, params);
if (err) {
ieee80211_if_remove(sdata);
return NULL;
}
}
return wdev;
}
static int ieee80211_del_iface(struct wiphy *wiphy, struct wireless_dev *wdev)
{
ieee80211_if_remove(IEEE80211_WDEV_TO_SUB_IF(wdev));
return 0;
}
static int ieee80211_change_iface(struct wiphy *wiphy,
struct net_device *dev,
enum nl80211_iftype type,
struct vif_params *params)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int ret;
ret = ieee80211_if_change_type(sdata, type);
if (ret)
return ret;
if (type == NL80211_IFTYPE_AP_VLAN &&
params && params->use_4addr == 0) {
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
ieee80211_check_fast_rx_iface(sdata);
} else if (type == NL80211_IFTYPE_STATION &&
params && params->use_4addr >= 0) {
sdata->u.mgd.use_4addr = params->use_4addr;
}
if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
ret = ieee80211_set_mon_options(sdata, params);
if (ret)
return ret;
}
return 0;
}
static int ieee80211_start_p2p_device(struct wiphy *wiphy,
struct wireless_dev *wdev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
int ret;
mutex_lock(&sdata->local->chanctx_mtx);
ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
mutex_unlock(&sdata->local->chanctx_mtx);
if (ret < 0)
return ret;
return ieee80211_do_open(wdev, true);
}
static void ieee80211_stop_p2p_device(struct wiphy *wiphy,
struct wireless_dev *wdev)
{
ieee80211_sdata_stop(IEEE80211_WDEV_TO_SUB_IF(wdev));
}
static int ieee80211_start_nan(struct wiphy *wiphy,
struct wireless_dev *wdev,
struct cfg80211_nan_conf *conf)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
int ret;
mutex_lock(&sdata->local->chanctx_mtx);
ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
mutex_unlock(&sdata->local->chanctx_mtx);
if (ret < 0)
return ret;
ret = ieee80211_do_open(wdev, true);
if (ret)
return ret;
ret = drv_start_nan(sdata->local, sdata, conf);
if (ret)
ieee80211_sdata_stop(sdata);
sdata->u.nan.conf = *conf;
return ret;
}
static void ieee80211_stop_nan(struct wiphy *wiphy,
struct wireless_dev *wdev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
drv_stop_nan(sdata->local, sdata);
ieee80211_sdata_stop(sdata);
}
static int ieee80211_nan_change_conf(struct wiphy *wiphy,
struct wireless_dev *wdev,
struct cfg80211_nan_conf *conf,
u32 changes)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
struct cfg80211_nan_conf new_conf;
int ret = 0;
if (sdata->vif.type != NL80211_IFTYPE_NAN)
return -EOPNOTSUPP;
if (!ieee80211_sdata_running(sdata))
return -ENETDOWN;
new_conf = sdata->u.nan.conf;
if (changes & CFG80211_NAN_CONF_CHANGED_PREF)
new_conf.master_pref = conf->master_pref;
if (changes & CFG80211_NAN_CONF_CHANGED_BANDS)
new_conf.bands = conf->bands;
ret = drv_nan_change_conf(sdata->local, sdata, &new_conf, changes);
if (!ret)
sdata->u.nan.conf = new_conf;
return ret;
}
static int ieee80211_add_nan_func(struct wiphy *wiphy,
struct wireless_dev *wdev,
struct cfg80211_nan_func *nan_func)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
int ret;
if (sdata->vif.type != NL80211_IFTYPE_NAN)
return -EOPNOTSUPP;
if (!ieee80211_sdata_running(sdata))
return -ENETDOWN;
spin_lock_bh(&sdata->u.nan.func_lock);
ret = idr_alloc(&sdata->u.nan.function_inst_ids,
nan_func, 1, sdata->local->hw.max_nan_de_entries + 1,
GFP_ATOMIC);
spin_unlock_bh(&sdata->u.nan.func_lock);
if (ret < 0)
return ret;
nan_func->instance_id = ret;
WARN_ON(nan_func->instance_id == 0);
ret = drv_add_nan_func(sdata->local, sdata, nan_func);
if (ret) {
spin_lock_bh(&sdata->u.nan.func_lock);
idr_remove(&sdata->u.nan.function_inst_ids,
nan_func->instance_id);
spin_unlock_bh(&sdata->u.nan.func_lock);
}
return ret;
}
static struct cfg80211_nan_func *
ieee80211_find_nan_func_by_cookie(struct ieee80211_sub_if_data *sdata,
u64 cookie)
{
struct cfg80211_nan_func *func;
int id;
lockdep_assert_held(&sdata->u.nan.func_lock);
idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, id) {
if (func->cookie == cookie)
return func;
}
return NULL;
}
static void ieee80211_del_nan_func(struct wiphy *wiphy,
struct wireless_dev *wdev, u64 cookie)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
struct cfg80211_nan_func *func;
u8 instance_id = 0;
if (sdata->vif.type != NL80211_IFTYPE_NAN ||
!ieee80211_sdata_running(sdata))
return;
spin_lock_bh(&sdata->u.nan.func_lock);
func = ieee80211_find_nan_func_by_cookie(sdata, cookie);
if (func)
instance_id = func->instance_id;
spin_unlock_bh(&sdata->u.nan.func_lock);
if (instance_id)
drv_del_nan_func(sdata->local, sdata, instance_id);
}
static int ieee80211_set_noack_map(struct wiphy *wiphy,
struct net_device *dev,
u16 noack_map)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
sdata->noack_map = noack_map;
ieee80211_check_fast_xmit_iface(sdata);
return 0;
}
static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
u8 key_idx, bool pairwise, const u8 *mac_addr,
struct key_params *params)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta = NULL;
const struct ieee80211_cipher_scheme *cs = NULL;
struct ieee80211_key *key;
int err;
if (!ieee80211_sdata_running(sdata))
return -ENETDOWN;
/* reject WEP and TKIP keys if WEP failed to initialize */
switch (params->cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_WEP104:
if (IS_ERR(local->wep_tx_tfm))
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
break;
default:
cs = ieee80211_cs_get(local, params->cipher, sdata->vif.type);
break;
}
key = ieee80211_key_alloc(params->cipher, key_idx, params->key_len,
params->key, params->seq_len, params->seq,
cs);
if (IS_ERR(key))
return PTR_ERR(key);
if (pairwise)
key->conf.flags |= IEEE80211_KEY_FLAG_PAIRWISE;
mutex_lock(&local->sta_mtx);
if (mac_addr) {
sta = sta_info_get_bss(sdata, mac_addr);
/*
* The ASSOC test makes sure the driver is ready to
* receive the key. When wpa_supplicant has roamed
* using FT, it attempts to set the key before
* association has completed, this rejects that attempt
* so it will set the key again after association.
*
* TODO: accept the key if we have a station entry and
* add it to the device after the station.
*/
if (!sta || !test_sta_flag(sta, WLAN_STA_ASSOC)) {
ieee80211_key_free_unused(key);
err = -ENOENT;
goto out_unlock;
}
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
/* Keys without a station are used for TX only */
if (key->sta && test_sta_flag(key->sta, WLAN_STA_MFP))
key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
break;
case NL80211_IFTYPE_ADHOC:
/* no MFP (yet) */
break;
case NL80211_IFTYPE_MESH_POINT:
#ifdef CONFIG_MAC80211_MESH
if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
break;
#endif
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_OCB:
/* shouldn't happen */
WARN_ON_ONCE(1);
break;
}
if (sta)
sta->cipher_scheme = cs;
err = ieee80211_key_link(key, sdata, sta);
out_unlock:
mutex_unlock(&local->sta_mtx);
return err;
}
static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
u8 key_idx, bool pairwise, const u8 *mac_addr)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
struct ieee80211_key *key = NULL;
int ret;
mutex_lock(&local->sta_mtx);
mutex_lock(&local->key_mtx);
if (mac_addr) {
ret = -ENOENT;
sta = sta_info_get_bss(sdata, mac_addr);
if (!sta)
goto out_unlock;
if (pairwise)
key = key_mtx_dereference(local, sta->ptk[key_idx]);
else
key = key_mtx_dereference(local, sta->gtk[key_idx]);
} else
key = key_mtx_dereference(local, sdata->keys[key_idx]);
if (!key) {
ret = -ENOENT;
goto out_unlock;
}
ieee80211_key_free(key, true);
ret = 0;
out_unlock:
mutex_unlock(&local->key_mtx);
mutex_unlock(&local->sta_mtx);
return ret;
}
static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
u8 key_idx, bool pairwise, const u8 *mac_addr,
void *cookie,
void (*callback)(void *cookie,
struct key_params *params))
{
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta = NULL;
u8 seq[6] = {0};
struct key_params params;
struct ieee80211_key *key = NULL;
u64 pn64;
u32 iv32;
u16 iv16;
int err = -ENOENT;
struct ieee80211_key_seq kseq = {};
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
rcu_read_lock();
if (mac_addr) {
sta = sta_info_get_bss(sdata, mac_addr);
if (!sta)
goto out;
if (pairwise && key_idx < NUM_DEFAULT_KEYS)
key = rcu_dereference(sta->ptk[key_idx]);
else if (!pairwise &&
key_idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
key = rcu_dereference(sta->gtk[key_idx]);
} else
key = rcu_dereference(sdata->keys[key_idx]);
if (!key)
goto out;
memset(¶ms, 0, sizeof(params));
params.cipher = key->conf.cipher;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_TKIP:
pn64 = atomic64_read(&key->conf.tx_pn);
iv32 = TKIP_PN_TO_IV32(pn64);
iv16 = TKIP_PN_TO_IV16(pn64);
if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
drv_get_key_seq(sdata->local, key, &kseq);
iv32 = kseq.tkip.iv32;
iv16 = kseq.tkip.iv16;
}
seq[0] = iv16 & 0xff;
seq[1] = (iv16 >> 8) & 0xff;
seq[2] = iv32 & 0xff;
seq[3] = (iv32 >> 8) & 0xff;
seq[4] = (iv32 >> 16) & 0xff;
seq[5] = (iv32 >> 24) & 0xff;
params.seq = seq;
params.seq_len = 6;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
BUILD_BUG_ON(offsetof(typeof(kseq), ccmp) !=
offsetof(typeof(kseq), aes_cmac));
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
BUILD_BUG_ON(offsetof(typeof(kseq), ccmp) !=
offsetof(typeof(kseq), aes_gmac));
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
BUILD_BUG_ON(offsetof(typeof(kseq), ccmp) !=
offsetof(typeof(kseq), gcmp));
if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
drv_get_key_seq(sdata->local, key, &kseq);
memcpy(seq, kseq.ccmp.pn, 6);
} else {
pn64 = atomic64_read(&key->conf.tx_pn);
seq[0] = pn64;
seq[1] = pn64 >> 8;
seq[2] = pn64 >> 16;
seq[3] = pn64 >> 24;
seq[4] = pn64 >> 32;
seq[5] = pn64 >> 40;
}
params.seq = seq;
params.seq_len = 6;
break;
default:
if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
break;
if (WARN_ON(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
break;
drv_get_key_seq(sdata->local, key, &kseq);
params.seq = kseq.hw.seq;
params.seq_len = kseq.hw.seq_len;
break;
}
params.key = key->conf.key;
params.key_len = key->conf.keylen;
callback(cookie, ¶ms);
err = 0;
out:
rcu_read_unlock();
return err;
}
static int ieee80211_config_default_key(struct wiphy *wiphy,
struct net_device *dev,
u8 key_idx, bool uni,
bool multi)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_set_default_key(sdata, key_idx, uni, multi);
return 0;
}
static int ieee80211_config_default_mgmt_key(struct wiphy *wiphy,
struct net_device *dev,
u8 key_idx)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_set_default_mgmt_key(sdata, key_idx);
return 0;
}
void sta_set_rate_info_tx(struct sta_info *sta,
const struct ieee80211_tx_rate *rate,
struct rate_info *rinfo)
{
rinfo->flags = 0;
if (rate->flags & IEEE80211_TX_RC_MCS) {
rinfo->flags |= RATE_INFO_FLAGS_MCS;
rinfo->mcs = rate->idx;
} else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
rinfo->flags |= RATE_INFO_FLAGS_VHT_MCS;
rinfo->mcs = ieee80211_rate_get_vht_mcs(rate);
rinfo->nss = ieee80211_rate_get_vht_nss(rate);
} else {
struct ieee80211_supported_band *sband;
int shift = ieee80211_vif_get_shift(&sta->sdata->vif);
u16 brate;
sband = ieee80211_get_sband(sta->sdata);
if (sband) {
brate = sband->bitrates[rate->idx].bitrate;
rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
}
}
if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
rinfo->bw = RATE_INFO_BW_40;
else if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
rinfo->bw = RATE_INFO_BW_80;
else if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
rinfo->bw = RATE_INFO_BW_160;
else
rinfo->bw = RATE_INFO_BW_20;
if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
}
static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev,
int idx, u8 *mac, struct station_info *sinfo)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
int ret = -ENOENT;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_by_idx(sdata, idx);
if (sta) {
ret = 0;
memcpy(mac, sta->sta.addr, ETH_ALEN);
sta_set_sinfo(sta, sinfo);
}
mutex_unlock(&local->sta_mtx);
return ret;
}
static int ieee80211_dump_survey(struct wiphy *wiphy, struct net_device *dev,
int idx, struct survey_info *survey)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
return drv_get_survey(local, idx, survey);
}
static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev,
const u8 *mac, struct station_info *sinfo)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
int ret = -ENOENT;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mac);
if (sta) {
ret = 0;
sta_set_sinfo(sta, sinfo);
}
mutex_unlock(&local->sta_mtx);
return ret;
}
static int ieee80211_set_monitor_channel(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_local *local = wiphy_priv(wiphy);
struct ieee80211_sub_if_data *sdata;
int ret = 0;
if (cfg80211_chandef_identical(&local->monitor_chandef, chandef))
return 0;
mutex_lock(&local->mtx);
if (local->use_chanctx) {
sdata = rtnl_dereference(local->monitor_sdata);
if (sdata) {
ieee80211_vif_release_channel(sdata);
ret = ieee80211_vif_use_channel(sdata, chandef,
IEEE80211_CHANCTX_EXCLUSIVE);
}
} else if (local->open_count == local->monitors) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
if (ret == 0)
local->monitor_chandef = *chandef;
mutex_unlock(&local->mtx);
return ret;
}
static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
const u8 *resp, size_t resp_len,
const struct ieee80211_csa_settings *csa)
{
struct probe_resp *new, *old;
if (!resp || !resp_len)
return 1;
old = sdata_dereference(sdata->u.ap.probe_resp, sdata);
new = kzalloc(sizeof(struct probe_resp) + resp_len, GFP_KERNEL);
if (!new)
return -ENOMEM;
new->len = resp_len;
memcpy(new->data, resp, resp_len);
if (csa)
memcpy(new->csa_counter_offsets, csa->counter_offsets_presp,
csa->n_counter_offsets_presp *
sizeof(new->csa_counter_offsets[0]));
rcu_assign_pointer(sdata->u.ap.probe_resp, new);
if (old)
kfree_rcu(old, rcu_head);
return 0;
}
static int ieee80211_assign_beacon(struct ieee80211_sub_if_data *sdata,
struct cfg80211_beacon_data *params,
const struct ieee80211_csa_settings *csa)
{
struct beacon_data *new, *old;
int new_head_len, new_tail_len;
int size, err;
u32 changed = BSS_CHANGED_BEACON;
old = sdata_dereference(sdata->u.ap.beacon, sdata);
/* Need to have a beacon head if we don't have one yet */
if (!params->head && !old)
return -EINVAL;
/* new or old head? */
if (params->head)
new_head_len = params->head_len;
else
new_head_len = old->head_len;
/* new or old tail? */
if (params->tail || !old)
/* params->tail_len will be zero for !params->tail */
new_tail_len = params->tail_len;
else
new_tail_len = old->tail_len;
size = sizeof(*new) + new_head_len + new_tail_len;
new = kzalloc(size, GFP_KERNEL);
if (!new)
return -ENOMEM;
/* start filling the new info now */
/*
* pointers go into the block we allocated,
* memory is | beacon_data | head | tail |
*/
new->head = ((u8 *) new) + sizeof(*new);
new->tail = new->head + new_head_len;
new->head_len = new_head_len;
new->tail_len = new_tail_len;
if (csa) {
new->csa_current_counter = csa->count;
memcpy(new->csa_counter_offsets, csa->counter_offsets_beacon,
csa->n_counter_offsets_beacon *
sizeof(new->csa_counter_offsets[0]));
}
/* copy in head */
if (params->head)
memcpy(new->head, params->head, new_head_len);
else
memcpy(new->head, old->head, new_head_len);
/* copy in optional tail */
if (params->tail)
memcpy(new->tail, params->tail, new_tail_len);
else
if (old)
memcpy(new->tail, old->tail, new_tail_len);
err = ieee80211_set_probe_resp(sdata, params->probe_resp,
params->probe_resp_len, csa);
if (err < 0)
return err;
if (err == 0)
changed |= BSS_CHANGED_AP_PROBE_RESP;
rcu_assign_pointer(sdata->u.ap.beacon, new);
if (old)
kfree_rcu(old, rcu_head);
return changed;
}
static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
struct cfg80211_ap_settings *params)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct beacon_data *old;
struct ieee80211_sub_if_data *vlan;
u32 changed = BSS_CHANGED_BEACON_INT |
BSS_CHANGED_BEACON_ENABLED |
BSS_CHANGED_BEACON |
BSS_CHANGED_SSID |
BSS_CHANGED_P2P_PS |
BSS_CHANGED_TXPOWER;
int err;
old = sdata_dereference(sdata->u.ap.beacon, sdata);
if (old)
return -EALREADY;
switch (params->smps_mode) {
case NL80211_SMPS_OFF:
sdata->smps_mode = IEEE80211_SMPS_OFF;
break;
case NL80211_SMPS_STATIC:
sdata->smps_mode = IEEE80211_SMPS_STATIC;
break;
case NL80211_SMPS_DYNAMIC:
sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
break;
default:
return -EINVAL;
}
sdata->needed_rx_chains = sdata->local->rx_chains;
sdata->vif.bss_conf.beacon_int = params->beacon_interval;
mutex_lock(&local->mtx);
err = ieee80211_vif_use_channel(sdata, ¶ms->chandef,
IEEE80211_CHANCTX_SHARED);
if (!err)
ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
mutex_unlock(&local->mtx);
if (err)
return err;
/*
* Apply control port protocol, this allows us to
* not encrypt dynamic WEP control frames.
*/
sdata->control_port_protocol = params->crypto.control_port_ethertype;
sdata->control_port_no_encrypt = params->crypto.control_port_no_encrypt;
sdata->encrypt_headroom = ieee80211_cs_headroom(sdata->local,
¶ms->crypto,
sdata->vif.type);
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
vlan->control_port_protocol =
params->crypto.control_port_ethertype;
vlan->control_port_no_encrypt =
params->crypto.control_port_no_encrypt;
vlan->encrypt_headroom =
ieee80211_cs_headroom(sdata->local,
¶ms->crypto,
vlan->vif.type);
}
sdata->vif.bss_conf.dtim_period = params->dtim_period;
sdata->vif.bss_conf.enable_beacon = true;
sdata->vif.bss_conf.allow_p2p_go_ps = sdata->vif.p2p;
sdata->vif.bss_conf.ssid_len = params->ssid_len;
if (params->ssid_len)
memcpy(sdata->vif.bss_conf.ssid, params->ssid,
params->ssid_len);
sdata->vif.bss_conf.hidden_ssid =
(params->hidden_ssid != NL80211_HIDDEN_SSID_NOT_IN_USE);
memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
sizeof(sdata->vif.bss_conf.p2p_noa_attr));
sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow =
params->p2p_ctwindow & IEEE80211_P2P_OPPPS_CTWINDOW_MASK;
if (params->p2p_opp_ps)
sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow |=
IEEE80211_P2P_OPPPS_ENABLE_BIT;
err = ieee80211_assign_beacon(sdata, ¶ms->beacon, NULL);
if (err < 0) {
ieee80211_vif_release_channel(sdata);
return err;
}
changed |= err;
err = drv_start_ap(sdata->local, sdata);
if (err) {
old = sdata_dereference(sdata->u.ap.beacon, sdata);
if (old)
kfree_rcu(old, rcu_head);
RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
ieee80211_vif_release_channel(sdata);
return err;
}
ieee80211_recalc_dtim(local, sdata);
ieee80211_bss_info_change_notify(sdata, changed);
netif_carrier_on(dev);
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
netif_carrier_on(vlan->dev);
return 0;
}
static int ieee80211_change_beacon(struct wiphy *wiphy, struct net_device *dev,
struct cfg80211_beacon_data *params)
{
struct ieee80211_sub_if_data *sdata;
struct beacon_data *old;
int err;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
sdata_assert_lock(sdata);
/* don't allow changing the beacon while CSA is in place - offset
* of channel switch counter may change
*/
if (sdata->vif.csa_active)
return -EBUSY;