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linux-sg2042/net/mac80211/tdls.c

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/*
* mac80211 TDLS handling code
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2014, Intel Corporation
* Copyright 2014 Intel Mobile Communications GmbH
*
* This file is GPLv2 as found in COPYING.
*/
#include <linux/ieee80211.h>
#include <linux/log2.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
/* give usermode some time for retries in setting up the TDLS session */
#define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
void ieee80211_tdls_peer_del_work(struct work_struct *wk)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local;
sdata = container_of(wk, struct ieee80211_sub_if_data,
u.mgd.tdls_peer_del_work.work);
local = sdata->local;
mutex_lock(&local->mtx);
if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
eth_zero_addr(sdata->u.mgd.tdls_peer);
}
mutex_unlock(&local->mtx);
}
static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
{
u8 *pos = (void *)skb_put(skb, 7);
*pos++ = WLAN_EID_EXT_CAPABILITY;
*pos++ = 5; /* len */
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
}
static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
u16 status_code)
{
struct ieee80211_local *local = sdata->local;
u16 capab;
/* The capability will be 0 when sending a failure code */
if (status_code != 0)
return 0;
capab = 0;
if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
return capab;
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
return capab;
}
static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
bool initiator)
{
struct ieee80211_tdls_lnkie *lnkid;
const u8 *init_addr, *rsp_addr;
if (initiator) {
init_addr = sdata->vif.addr;
rsp_addr = peer;
} else {
init_addr = peer;
rsp_addr = sdata->vif.addr;
}
lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
lnkid->ie_type = WLAN_EID_LINK_ID;
lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
}
/* translate numbering in the WMM parameter IE to the mac80211 notation */
static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
{
switch (ac) {
default:
WARN_ON_ONCE(1);
case 0:
return IEEE80211_AC_BE;
case 1:
return IEEE80211_AC_BK;
case 2:
return IEEE80211_AC_VI;
case 3:
return IEEE80211_AC_VO;
}
}
static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
{
u8 ret;
ret = aifsn & 0x0f;
if (acm)
ret |= 0x10;
ret |= (aci << 5) & 0x60;
return ret;
}
static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
{
return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
((ilog2(cw_max + 1) << 0x4) & 0xf0);
}
static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_wmm_param_ie *wmm;
struct ieee80211_tx_queue_params *txq;
int i;
wmm = (void *)skb_put(skb, sizeof(*wmm));
memset(wmm, 0, sizeof(*wmm));
wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
wmm->len = sizeof(*wmm) - 2;
wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
wmm->oui[1] = 0x50;
wmm->oui[2] = 0xf2;
wmm->oui_type = 2; /* WME */
wmm->oui_subtype = 1; /* WME param */
wmm->version = 1; /* WME ver */
wmm->qos_info = 0; /* U-APSD not in use */
/*
* Use the EDCA parameters defined for the BSS, or default if the AP
* doesn't support it, as mandated by 802.11-2012 section 10.22.4
*/
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
txq->acm, i);
wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
}
}
static void
ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
u8 action_code, bool initiator,
const u8 *extra_ies, size_t extra_ies_len)
{
enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
struct ieee80211_sta_ht_cap ht_cap;
struct sta_info *sta = NULL;
size_t offset = 0, noffset;
u8 *pos;
rcu_read_lock();
/* we should have the peer STA if we're already responding */
if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
sta = sta_info_get(sdata, peer);
if (WARN_ON_ONCE(!sta)) {
rcu_read_unlock();
return;
}
}
ieee80211_add_srates_ie(sdata, skb, false, band);
ieee80211_add_ext_srates_ie(sdata, skb, false, band);
/* add any custom IEs that go before Extended Capabilities */
if (extra_ies_len) {
static const u8 before_ext_cap[] = {
WLAN_EID_SUPP_RATES,
WLAN_EID_COUNTRY,
WLAN_EID_EXT_SUPP_RATES,
WLAN_EID_SUPPORTED_CHANNELS,
WLAN_EID_RSN,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_ext_cap,
ARRAY_SIZE(before_ext_cap),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
offset = noffset;
}
ieee80211_tdls_add_ext_capab(skb);
/* add the QoS element if we support it */
if (local->hw.queues >= IEEE80211_NUM_ACS &&
action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
/* add any custom IEs that go before HT capabilities */
if (extra_ies_len) {
static const u8 before_ht_cap[] = {
WLAN_EID_SUPP_RATES,
WLAN_EID_COUNTRY,
WLAN_EID_EXT_SUPP_RATES,
WLAN_EID_SUPPORTED_CHANNELS,
WLAN_EID_RSN,
WLAN_EID_EXT_CAPABILITY,
WLAN_EID_QOS_CAPA,
WLAN_EID_FAST_BSS_TRANSITION,
WLAN_EID_TIMEOUT_INTERVAL,
WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_ht_cap,
ARRAY_SIZE(before_ht_cap),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
offset = noffset;
}
/*
* with TDLS we can switch channels, and HT-caps are not necessarily
* the same on all bands. The specification limits the setup to a
* single HT-cap, so use the current band for now.
*/
sband = local->hw.wiphy->bands[band];
memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
action_code == WLAN_TDLS_SETUP_RESPONSE) &&
ht_cap.ht_supported && (!sta || sta->sta.ht_cap.ht_supported)) {
if (action_code == WLAN_TDLS_SETUP_REQUEST) {
ieee80211_apply_htcap_overrides(sdata, &ht_cap);
/* disable SMPS in TDLS initiator */
ht_cap.cap |= (WLAN_HT_CAP_SM_PS_DISABLED
<< IEEE80211_HT_CAP_SM_PS_SHIFT);
} else {
/* disable SMPS in TDLS responder */
sta->sta.ht_cap.cap |=
(WLAN_HT_CAP_SM_PS_DISABLED
<< IEEE80211_HT_CAP_SM_PS_SHIFT);
/* the peer caps are already intersected with our own */
memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
}
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
}
rcu_read_unlock();
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
}
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
}
static void
ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
size_t offset = 0, noffset;
struct sta_info *sta, *ap_sta;
u8 *pos;
rcu_read_lock();
sta = sta_info_get(sdata, peer);
ap_sta = sta_info_get(sdata, ifmgd->bssid);
if (WARN_ON_ONCE(!sta || !ap_sta)) {
rcu_read_unlock();
return;
}
/* add any custom IEs that go before the QoS IE */
if (extra_ies_len) {
static const u8 before_qos[] = {
WLAN_EID_RSN,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_qos,
ARRAY_SIZE(before_qos),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
offset = noffset;
}
/* add the QoS param IE if both the peer and we support it */
if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
ieee80211_tdls_add_wmm_param_ie(sdata, skb);
/* add any custom IEs that go before HT operation */
if (extra_ies_len) {
static const u8 before_ht_op[] = {
WLAN_EID_RSN,
WLAN_EID_QOS_CAPA,
WLAN_EID_FAST_BSS_TRANSITION,
WLAN_EID_TIMEOUT_INTERVAL,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_ht_op,
ARRAY_SIZE(before_ht_op),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
offset = noffset;
}
/* if HT support is only added in TDLS, we need an HT-operation IE */
if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
struct ieee80211_chanctx_conf *chanctx_conf =
rcu_dereference(sdata->vif.chanctx_conf);
if (!WARN_ON(!chanctx_conf)) {
pos = skb_put(skb, 2 +
sizeof(struct ieee80211_ht_operation));
/* send an empty HT operation IE */
ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
&chanctx_conf->def, 0);
}
}
rcu_read_unlock();
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
}
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
}
static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
u8 action_code, u16 status_code,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len)
{
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
case WLAN_TDLS_SETUP_RESPONSE:
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
if (status_code == 0)
ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
action_code,
initiator,
extra_ies,
extra_ies_len);
break;
case WLAN_TDLS_SETUP_CONFIRM:
if (status_code == 0)
ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
initiator, extra_ies,
extra_ies_len);
break;
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_DISCOVERY_REQUEST:
if (extra_ies_len)
memcpy(skb_put(skb, extra_ies_len), extra_ies,
extra_ies_len);
if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
break;
}
}
static int
ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code, u8 dialog_token,
u16 status_code, struct sk_buff *skb)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_tdls_data *tf;
tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
memcpy(tf->da, peer, ETH_ALEN);
memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
tf->ether_type = cpu_to_be16(ETH_P_TDLS);
tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
/* network header is after the ethernet header */
skb_set_network_header(skb, ETH_HLEN);
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_SETUP_REQUEST;
skb_put(skb, sizeof(tf->u.setup_req));
tf->u.setup_req.dialog_token = dialog_token;
tf->u.setup_req.capability =
cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
status_code));
break;
case WLAN_TDLS_SETUP_RESPONSE:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
skb_put(skb, sizeof(tf->u.setup_resp));
tf->u.setup_resp.status_code = cpu_to_le16(status_code);
tf->u.setup_resp.dialog_token = dialog_token;
tf->u.setup_resp.capability =
cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
status_code));
break;
case WLAN_TDLS_SETUP_CONFIRM:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
skb_put(skb, sizeof(tf->u.setup_cfm));
tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
tf->u.setup_cfm.dialog_token = dialog_token;
break;
case WLAN_TDLS_TEARDOWN:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_TEARDOWN;
skb_put(skb, sizeof(tf->u.teardown));
tf->u.teardown.reason_code = cpu_to_le16(status_code);
break;
case WLAN_TDLS_DISCOVERY_REQUEST:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
skb_put(skb, sizeof(tf->u.discover_req));
tf->u.discover_req.dialog_token = dialog_token;
break;
default:
return -EINVAL;
}
return 0;
}
static int
ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code, u8 dialog_token,
u16 status_code, struct sk_buff *skb)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_mgmt *mgmt;
mgmt = (void *)skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, peer, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
switch (action_code) {
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
mgmt->u.action.u.tdls_discover_resp.action_code =
WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
mgmt->u.action.u.tdls_discover_resp.dialog_token =
dialog_token;
mgmt->u.action.u.tdls_discover_resp.capability =
cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
status_code));
break;
default:
return -EINVAL;
}
return 0;
}
static int
ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code,
u8 dialog_token, u16 status_code,
u32 peer_capability, bool initiator,
const u8 *extra_ies, size_t extra_ies_len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb = NULL;
bool send_direct;
struct sta_info *sta;
int ret;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
max(sizeof(struct ieee80211_mgmt),
sizeof(struct ieee80211_tdls_data)) +
50 + /* supported rates */
7 + /* ext capab */
26 + /* max(WMM-info, WMM-param) */
2 + max(sizeof(struct ieee80211_ht_cap),
sizeof(struct ieee80211_ht_operation)) +
extra_ies_len +
sizeof(struct ieee80211_tdls_lnkie));
if (!skb)
return -ENOMEM;
skb_reserve(skb, local->hw.extra_tx_headroom);
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
case WLAN_TDLS_SETUP_RESPONSE:
case WLAN_TDLS_SETUP_CONFIRM:
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_DISCOVERY_REQUEST:
ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer,
action_code, dialog_token,
status_code, skb);
send_direct = false;
break;
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code,
dialog_token, status_code,
skb);
send_direct = true;
break;
default:
ret = -ENOTSUPP;
break;
}
if (ret < 0)
goto fail;
rcu_read_lock();
sta = sta_info_get(sdata, peer);
/* infer the initiator if we can, to support old userspace */
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
if (sta)
set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
/* fall-through */
case WLAN_TDLS_SETUP_CONFIRM:
case WLAN_TDLS_DISCOVERY_REQUEST:
initiator = true;
break;
case WLAN_TDLS_SETUP_RESPONSE:
/*
* In some testing scenarios, we send a request and response.
* Make the last packet sent take effect for the initiator
* value.
*/
if (sta)
clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
/* fall-through */
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
initiator = false;
break;
case WLAN_TDLS_TEARDOWN:
/* any value is ok */
break;
default:
ret = -ENOTSUPP;
break;
}
if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
initiator = true;
rcu_read_unlock();
if (ret < 0)
goto fail;
ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
initiator, extra_ies, extra_ies_len);
if (send_direct) {
ieee80211_tx_skb(sdata, skb);
return 0;
}
/*
* According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
* we should default to AC_VI.
*/
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
case WLAN_TDLS_SETUP_RESPONSE:
skb_set_queue_mapping(skb, IEEE80211_AC_BK);
skb->priority = 2;
break;
default:
skb_set_queue_mapping(skb, IEEE80211_AC_VI);
skb->priority = 5;
break;
}
/* disable bottom halves when entering the Tx path */
local_bh_disable();
ret = ieee80211_subif_start_xmit(skb, dev);
local_bh_enable();
return ret;
fail:
dev_kfree_skb(skb);
return ret;
}
static int
ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code, u8 dialog_token,
u16 status_code, u32 peer_capability, bool initiator,
const u8 *extra_ies, size_t extra_ies_len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
int ret;
mutex_lock(&local->mtx);
/* we don't support concurrent TDLS peer setups */
if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
!ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
ret = -EBUSY;
goto exit;
}
/*
* make sure we have a STA representing the peer so we drop or buffer
* non-TDLS-setup frames to the peer. We can't send other packets
* during setup through the AP path.
* Allow error packets to be sent - sometimes we don't even add a STA
* before failing the setup.
*/
if (status_code == 0) {
rcu_read_lock();
if (!sta_info_get(sdata, peer)) {
rcu_read_unlock();
ret = -ENOLINK;
goto exit;
}
rcu_read_unlock();
}
ieee80211_flush_queues(local, sdata);
ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
dialog_token, status_code,
peer_capability, initiator,
extra_ies, extra_ies_len);
if (ret < 0)
goto exit;
memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
ieee80211_queue_delayed_work(&sdata->local->hw,
&sdata->u.mgd.tdls_peer_del_work,
TDLS_PEER_SETUP_TIMEOUT);
exit:
mutex_unlock(&local->mtx);
return ret;
}
static int
ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code, u8 dialog_token,
u16 status_code, u32 peer_capability,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
int ret;
/*
* No packets can be transmitted to the peer via the AP during setup -
* the STA is set as a TDLS peer, but is not authorized.
* During teardown, we prevent direct transmissions by stopping the
* queues and flushing all direct packets.
*/
ieee80211_stop_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
ieee80211_flush_queues(local, sdata);
ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
dialog_token, status_code,
peer_capability, initiator,
extra_ies, extra_ies_len);
if (ret < 0)
sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
ret);
/*
* Remove the STA AUTH flag to force further traffic through the AP. If
* the STA was unreachable, it was already removed.
*/
rcu_read_lock();
sta = sta_info_get(sdata, peer);
if (sta)
clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
rcu_read_unlock();
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
return 0;
}
int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, u8 action_code, u8 dialog_token,
u16 status_code, u32 peer_capability,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int ret;
if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
return -ENOTSUPP;
/* make sure we are in managed mode, and associated */
if (sdata->vif.type != NL80211_IFTYPE_STATION ||
!sdata->u.mgd.associated)
return -EINVAL;
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
case WLAN_TDLS_SETUP_RESPONSE:
ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
dialog_token, status_code,
peer_capability, initiator,
extra_ies, extra_ies_len);
break;
case WLAN_TDLS_TEARDOWN:
ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
action_code, dialog_token,
status_code,
peer_capability, initiator,
extra_ies, extra_ies_len);
break;
case WLAN_TDLS_DISCOVERY_REQUEST:
/*
* Protect the discovery so we can hear the TDLS discovery
* response frame. It is transmitted directly and not buffered
* by the AP.
*/
drv_mgd_protect_tdls_discover(sdata->local, sdata);
/* fall-through */
case WLAN_TDLS_SETUP_CONFIRM:
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
/* no special handling */
ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
action_code,
dialog_token,
status_code,
peer_capability,
initiator, extra_ies,
extra_ies_len);
break;
default:
ret = -EOPNOTSUPP;
break;
}
tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
action_code, peer, ret);
return ret;
}
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, enum nl80211_tdls_operation oper)
{
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
int ret;
if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
return -ENOTSUPP;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return -EINVAL;
switch (oper) {
case NL80211_TDLS_ENABLE_LINK:
case NL80211_TDLS_DISABLE_LINK:
break;
case NL80211_TDLS_TEARDOWN:
case NL80211_TDLS_SETUP:
case NL80211_TDLS_DISCOVERY_REQ:
/* We don't support in-driver setup/teardown/discovery */
return -ENOTSUPP;
}
mutex_lock(&local->mtx);
tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
switch (oper) {
case NL80211_TDLS_ENABLE_LINK:
rcu_read_lock();
sta = sta_info_get(sdata, peer);
if (!sta) {
rcu_read_unlock();
ret = -ENOLINK;
break;
}
set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
rcu_read_unlock();
WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
!ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
ret = 0;
break;
case NL80211_TDLS_DISABLE_LINK:
/*
* The teardown message in ieee80211_tdls_mgmt_teardown() was
* created while the queues were stopped, so it might still be
* pending. Before flushing the queues we need to be sure the
* message is handled by the tasklet handling pending messages,
* otherwise we might start destroying the station before
* sending the teardown packet.
* Note that this only forces the tasklet to flush pendings -
* not to stop the tasklet from rescheduling itself.
*/
tasklet_kill(&local->tx_pending_tasklet);
/* flush a potentially queued teardown packet */
ieee80211_flush_queues(local, sdata);
ret = sta_info_destroy_addr(sdata, peer);
break;
default:
ret = -ENOTSUPP;
break;
}
if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
eth_zero_addr(sdata->u.mgd.tdls_peer);
}
mutex_unlock(&local->mtx);
return ret;
}
void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
enum nl80211_tdls_operation oper,
u16 reason_code, gfp_t gfp)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
oper);
return;
}
cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
}
EXPORT_SYMBOL(ieee80211_tdls_oper_request);
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