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linux/net/mac80211/tdls.c
Johannes Berg c71420db65 wifi: mac80211: RCU-ify link STA pointers 
We need to be able to access these in a race-free way under
traffic while adding/removing them, so RCU-ify the pointers.
This requires passing a link_sta to a lot of functions so
we don't have to do the RCU handling everywhere.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2022-06-20 12:57:08 +02:00

2010 lines
55 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* mac80211 TDLS handling code
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2014, Intel Corporation
* Copyright 2014 Intel Mobile Communications GmbH
* Copyright 2015 - 2016 Intel Deutschland GmbH
* Copyright (C) 2019, 2021-2022 Intel Corporation
*/
#include <linux/ieee80211.h>
#include <linux/log2.h>
#include <net/cfg80211.h>
#include <linux/rtnetlink.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "wme.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 ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
bool chan_switch = local->hw.wiphy->features &
NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
!ifmgd->tdls_wider_bw_prohibited;
bool buffer_sta = ieee80211_hw_check(&local->hw,
SUPPORTS_TDLS_BUFFER_STA);
struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
bool vht = sband && sband->vht_cap.vht_supported;
u8 *pos = skb_put(skb, 10);
*pos++ = WLAN_EID_EXT_CAPABILITY;
*pos++ = 8; /* len */
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
(buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
*pos++ = 0;
*pos++ = 0;
*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
}
static u8
ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u16 start, u16 end,
u16 spacing)
{
u8 subband_cnt = 0, ch_cnt = 0;
struct ieee80211_channel *ch;
struct cfg80211_chan_def chandef;
int i, subband_start;
struct wiphy *wiphy = sdata->local->hw.wiphy;
for (i = start; i <= end; i += spacing) {
if (!ch_cnt)
subband_start = i;
ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
if (ch) {
/* we will be active on the channel */
cfg80211_chandef_create(&chandef, ch,
NL80211_CHAN_NO_HT);
if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
sdata->wdev.iftype)) {
ch_cnt++;
/*
* check if the next channel is also part of
* this allowed range
*/
continue;
}
}
/*
* we've reached the end of a range, with allowed channels
* found
*/
if (ch_cnt) {
u8 *pos = skb_put(skb, 2);
*pos++ = ieee80211_frequency_to_channel(subband_start);
*pos++ = ch_cnt;
subband_cnt++;
ch_cnt = 0;
}
}
/* all channels in the requested range are allowed - add them here */
if (ch_cnt) {
u8 *pos = skb_put(skb, 2);
*pos++ = ieee80211_frequency_to_channel(subband_start);
*pos++ = ch_cnt;
subband_cnt++;
}
return subband_cnt;
}
static void
ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
/*
* Add possible channels for TDLS. These are channels that are allowed
* to be active.
*/
u8 subband_cnt;
u8 *pos = skb_put(skb, 2);
*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
/*
* 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
* this doesn't happen in real world scenarios.
*/
/* 2GHz, with 5MHz spacing */
subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
/* 5GHz, with 20MHz spacing */
subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
/* length */
*pos = 2 * subband_cnt;
}
static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
u8 *pos;
u8 op_class;
if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
&op_class))
return;
pos = skb_put(skb, 4);
*pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
*pos++ = 2; /* len */
*pos++ = op_class;
*pos++ = op_class; /* give current operating class as alternate too */
}
static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
{
u8 *pos = skb_put(skb, 3);
*pos++ = WLAN_EID_BSS_COEX_2040;
*pos++ = 1; /* len */
*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
}
static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
u16 status_code)
{
struct ieee80211_supported_band *sband;
/* The capability will be 0 when sending a failure code */
if (status_code != 0)
return 0;
sband = ieee80211_get_sband(sdata);
if (sband && sband->band == NL80211_BAND_2GHZ) {
return WLAN_CAPABILITY_SHORT_SLOT_TIME |
WLAN_CAPABILITY_SHORT_PREAMBLE;
}
return 0;
}
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 = 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->deflink.u.mgd.bssid, ETH_ALEN);
memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
}
static void
ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
u8 *pos = skb_put(skb, 4);
*pos++ = WLAN_EID_AID;
*pos++ = 2; /* len */
put_unaligned_le16(sdata->vif.cfg.aid, pos);
}
/* 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);
fallthrough;
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 = skb_put_zero(skb, 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_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
{
/* IEEE802.11ac-2013 Table E-4 */
u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
struct cfg80211_chan_def uc = sta->tdls_chandef;
enum nl80211_chan_width max_width =
ieee80211_sta_cap_chan_bw(&sta->deflink);
int i;
/* only support upgrading non-narrow channels up to 80Mhz */
if (max_width == NL80211_CHAN_WIDTH_5 ||
max_width == NL80211_CHAN_WIDTH_10)
return;
if (max_width > NL80211_CHAN_WIDTH_80)
max_width = NL80211_CHAN_WIDTH_80;
if (uc.width >= max_width)
return;
/*
* Channel usage constrains in the IEEE802.11ac-2013 specification only
* allow expanding a 20MHz channel to 80MHz in a single way. In
* addition, there are no 40MHz allowed channels that are not part of
* the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
*/
for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
uc.center_freq1 = centers_80mhz[i];
uc.center_freq2 = 0;
uc.width = NL80211_CHAN_WIDTH_80;
break;
}
if (!uc.center_freq1)
return;
/* proceed to downgrade the chandef until usable or the same as AP BW */
while (uc.width > max_width ||
(uc.width > sta->tdls_chandef.width &&
!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
sdata->wdev.iftype)))
ieee80211_chandef_downgrade(&uc);
if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
sta->tdls_chandef.width, uc.width);
/*
* the station is not yet authorized when BW upgrade is done,
* locking is not required
*/
sta->tdls_chandef = uc;
}
}
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)
{
struct ieee80211_supported_band *sband;
struct ieee80211_local *local = sdata->local;
struct ieee80211_sta_ht_cap ht_cap;
struct ieee80211_sta_vht_cap vht_cap;
struct sta_info *sta = NULL;
size_t offset = 0, noffset;
u8 *pos;
sband = ieee80211_get_sband(sdata);
if (!sband)
return;
ieee80211_add_srates_ie(sdata, skb, false, sband->band);
ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
ieee80211_tdls_add_supp_channels(sdata, skb);
/* 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);
skb_put_data(skb, extra_ies + offset, noffset - offset);
offset = noffset;
}
ieee80211_tdls_add_ext_capab(sdata, 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);
skb_put_data(skb, extra_ies + offset, noffset - offset);
offset = noffset;
}
mutex_lock(&local->sta_mtx);
/* 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)) {
mutex_unlock(&local->sta_mtx);
return;
}
sta->tdls_chandef = sdata->vif.bss_conf.chandef;
}
ieee80211_tdls_add_oper_classes(sdata, skb);
/*
* 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.
*/
memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
ht_cap.ht_supported) {
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;
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
/* the peer caps are already intersected with our own */
memcpy(&ht_cap, &sta->sta.deflink.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);
}
if (ht_cap.ht_supported &&
(ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ieee80211_tdls_add_bss_coex_ie(skb);
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
/* add any custom IEs that go before VHT capabilities */
if (extra_ies_len) {
static const u8 before_vht_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,
WLAN_EID_MULTI_BAND,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_vht_cap,
ARRAY_SIZE(before_vht_cap),
offset);
skb_put_data(skb, extra_ies + offset, noffset - offset);
offset = noffset;
}
/* build the VHT-cap similarly to the HT-cap */
memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
vht_cap.vht_supported) {
ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
/* the AID is present only when VHT is implemented */
if (action_code == WLAN_TDLS_SETUP_REQUEST)
ieee80211_tdls_add_aid(sdata, skb);
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
/* the peer caps are already intersected with our own */
memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
/* the AID is present only when VHT is implemented */
ieee80211_tdls_add_aid(sdata, skb);
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
/*
* if both peers support WIDER_BW, we can expand the chandef to
* a wider compatible one, up to 80MHz
*/
if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
}
mutex_unlock(&local->sta_mtx);
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
skb_put_data(skb, extra_ies + offset, noffset - offset);
}
}
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;
size_t offset = 0, noffset;
struct sta_info *sta, *ap_sta;
struct ieee80211_supported_band *sband;
u8 *pos;
sband = ieee80211_get_sband(sdata);
if (!sband)
return;
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, peer);
ap_sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
if (WARN_ON_ONCE(!sta || !ap_sta)) {
mutex_unlock(&local->sta_mtx);
return;
}
sta->tdls_chandef = sdata->vif.bss_conf.chandef;
/* 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);
skb_put_data(skb, 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);
skb_put_data(skb, extra_ies + offset, noffset - offset);
offset = noffset;
}
/*
* if HT support is only added in TDLS, we need an HT-operation IE.
* add the IE as required by IEEE802.11-2012 9.23.3.2.
*/
if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
&sdata->vif.bss_conf.chandef, prot,
true);
}
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
/* only include VHT-operation if not on the 2.4GHz band */
if (sband->band != NL80211_BAND_2GHZ &&
sta->sta.deflink.vht_cap.vht_supported) {
/*
* if both peers support WIDER_BW, we can expand the chandef to
* a wider compatible one, up to 80MHz
*/
if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
&sta->tdls_chandef);
}
mutex_unlock(&local->sta_mtx);
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
skb_put_data(skb, extra_ies + offset, noffset - offset);
}
}
static void
ieee80211_tdls_add_chan_switch_req_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, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_tdls_data *tf;
size_t offset = 0, noffset;
if (WARN_ON_ONCE(!chandef))
return;
tf = (void *)skb->data;
tf->u.chan_switch_req.target_channel =
ieee80211_frequency_to_channel(chandef->chan->center_freq);
tf->u.chan_switch_req.oper_class = oper_class;
if (extra_ies_len) {
static const u8 before_lnkie[] = {
WLAN_EID_SECONDARY_CHANNEL_OFFSET,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_lnkie,
ARRAY_SIZE(before_lnkie),
offset);
skb_put_data(skb, extra_ies + offset, noffset - offset);
offset = noffset;
}
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
skb_put_data(skb, extra_ies + offset, noffset - offset);
}
}
static void
ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
u16 status_code, bool initiator,
const u8 *extra_ies,
size_t extra_ies_len)
{
if (status_code == 0)
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
if (extra_ies_len)
skb_put_data(skb, extra_ies, extra_ies_len);
}
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, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
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)
skb_put_data(skb, extra_ies, extra_ies_len);
if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
break;
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
initiator, extra_ies,
extra_ies_len,
oper_class, chandef);
break;
case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
status_code,
initiator, extra_ies,
extra_ies_len);
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 = 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;
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
skb_put(skb, sizeof(tf->u.chan_switch_req));
break;
case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
skb_put(skb, sizeof(tf->u.chan_switch_resp));
tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
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 = skb_put_zero(skb, 24);
memcpy(mgmt->da, peer, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, sdata->deflink.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 struct sk_buff *
ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
const u8 *peer, u8 action_code,
u8 dialog_token, u16 status_code,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
int ret;
skb = netdev_alloc_skb(sdata->dev,
local->hw.extra_tx_headroom +
max(sizeof(struct ieee80211_mgmt),
sizeof(struct ieee80211_tdls_data)) +
50 + /* supported rates */
10 + /* ext capab */
26 + /* max(WMM-info, WMM-param) */
2 + max(sizeof(struct ieee80211_ht_cap),
sizeof(struct ieee80211_ht_operation)) +
2 + max(sizeof(struct ieee80211_vht_cap),
sizeof(struct ieee80211_vht_operation)) +
50 + /* supported channels */
3 + /* 40/20 BSS coex */
4 + /* AID */
4 + /* oper classes */
extra_ies_len +
sizeof(struct ieee80211_tdls_lnkie));
if (!skb)
return NULL;
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:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
sdata->dev, peer,
action_code, dialog_token,
status_code, skb);
break;
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
peer, action_code,
dialog_token, status_code,
skb);
break;
default:
ret = -ENOTSUPP;
break;
}
if (ret < 0)
goto fail;
ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
initiator, extra_ies, extra_ies_len, oper_class,
chandef);
return skb;
fail:
dev_kfree_skb(skb);
return NULL;
}
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, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sk_buff *skb = NULL;
struct sta_info *sta;
u32 flags = 0;
int ret = 0;
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);
sta->sta.tdls_initiator = false;
}
fallthrough;
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);
sta->sta.tdls_initiator = true;
}
fallthrough;
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
initiator = false;
break;
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
/* 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;
skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
dialog_token, status_code,
initiator, extra_ies,
extra_ies_len, oper_class,
chandef);
if (!skb) {
ret = -EINVAL;
goto fail;
}
if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
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->priority = 256 + 2;
break;
default:
skb->priority = 256 + 5;
break;
}
skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
/*
* Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
* Later, if no ACK is returned from peer, we will re-send the teardown
* packet through the AP.
*/
if ((action_code == WLAN_TDLS_TEARDOWN) &&
ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
bool try_resend; /* Should we keep skb for possible resend */
/* If not sending directly to peer - no point in keeping skb */
rcu_read_lock();
sta = sta_info_get(sdata, peer);
try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
rcu_read_unlock();
spin_lock_bh(&sdata->u.mgd.teardown_lock);
if (try_resend && !sdata->u.mgd.teardown_skb) {
/* Mark it as requiring TX status callback */
flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_INTFL_MLME_CONN_TX;
/*
* skb is copied since mac80211 will later set
* properties that might not be the same as the AP,
* such as encryption, QoS, addresses, etc.
*
* No problem if skb_copy() fails, so no need to check.
*/
sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
sdata->u.mgd.orig_teardown_skb = skb;
}
spin_unlock_bh(&sdata->u.mgd.teardown_lock);
}
/* disable bottom halves when entering the Tx path */
local_bh_disable();
__ieee80211_subif_start_xmit(skb, dev, flags, 0, NULL);
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;
enum ieee80211_smps_mode smps_mode =
sdata->deflink.u.mgd.driver_smps_mode;
int ret;
/* don't support setup with forced SMPS mode that's not off */
if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
smps_mode != IEEE80211_SMPS_OFF) {
tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
smps_mode);
return -ENOTSUPP;
}
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 out_unlock;
}
/*
* 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 out_unlock;
}
rcu_read_unlock();
}
ieee80211_flush_queues(local, sdata, false);
memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
mutex_unlock(&local->mtx);
/* we cannot take the mutex while preparing the setup packet */
ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
dialog_token, status_code,
peer_capability, initiator,
extra_ies, extra_ies_len, 0,
NULL);
if (ret < 0) {
mutex_lock(&local->mtx);
eth_zero_addr(sdata->u.mgd.tdls_peer);
mutex_unlock(&local->mtx);
return ret;
}
ieee80211_queue_delayed_work(&sdata->local->hw,
&sdata->u.mgd.tdls_peer_del_work,
TDLS_PEER_SETUP_TIMEOUT);
return 0;
out_unlock:
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, false);
ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
dialog_token, status_code,
peer_capability, initiator,
extra_ies, extra_ies_len, 0,
NULL);
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);
fallthrough;
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, 0, NULL);
break;
default:
ret = -EOPNOTSUPP;
break;
}
tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
action_code, peer, ret);
return ret;
}
static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *ctx;
enum nl80211_chan_width width;
struct ieee80211_supported_band *sband;
mutex_lock(&local->chanctx_mtx);
conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (conf) {
width = conf->def.width;
sband = local->hw.wiphy->bands[conf->def.chan->band];
ctx = container_of(conf, struct ieee80211_chanctx, conf);
ieee80211_recalc_chanctx_chantype(local, ctx);
/* if width changed and a peer is given, update its BW */
if (width != conf->def.width && sta &&
test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
enum ieee80211_sta_rx_bandwidth bw;
bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
if (bw != sta->sta.deflink.bandwidth) {
sta->sta.deflink.bandwidth = bw;
rate_control_rate_update(local, sband, sta, 0,
IEEE80211_RC_BW_CHANGED);
/*
* if a TDLS peer BW was updated, we need to
* recalc the chandef width again, to get the
* correct chanctx min_def
*/
ieee80211_recalc_chanctx_chantype(local, ctx);
}
}
}
mutex_unlock(&local->chanctx_mtx);
}
static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
{
struct sta_info *sta;
bool result = false;
rcu_read_lock();
list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
!sta->sta.deflink.ht_cap.ht_supported)
continue;
result = true;
break;
}
rcu_read_unlock();
return result;
}
static void
iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
bool tdls_ht;
u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
u16 opmode;
/* Nothing to do if the BSS connection uses HT */
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
return;
tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
iee80211_tdls_have_ht_peers(sdata);
opmode = sdata->vif.bss_conf.ht_operation_mode;
if (tdls_ht)
opmode |= protection;
else
opmode &= ~protection;
if (opmode == sdata->vif.bss_conf.ht_operation_mode)
return;
sdata->vif.bss_conf.ht_operation_mode = opmode;
ieee80211_link_info_change_notify(sdata, 0, BSS_CHANGED_HT);
}
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;
}
/* protect possible bss_conf changes and avoid concurrency in
* ieee80211_bss_info_change_notify()
*/
sdata_lock(sdata);
mutex_lock(&local->mtx);
tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
switch (oper) {
case NL80211_TDLS_ENABLE_LINK:
if (sdata->vif.bss_conf.csa_active) {
tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
ret = -EBUSY;
break;
}
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, peer);
if (!sta) {
mutex_unlock(&local->sta_mtx);
ret = -ENOLINK;
break;
}
iee80211_tdls_recalc_chanctx(sdata, sta);
iee80211_tdls_recalc_ht_protection(sdata, sta);
set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
mutex_unlock(&local->sta_mtx);
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, false);
ret = sta_info_destroy_addr(sdata, peer);
mutex_lock(&local->sta_mtx);
iee80211_tdls_recalc_ht_protection(sdata, NULL);
mutex_unlock(&local->sta_mtx);
iee80211_tdls_recalc_chanctx(sdata, NULL);
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);
}
if (ret == 0)
ieee80211_queue_work(&sdata->local->hw,
&sdata->deflink.u.mgd.request_smps_work);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
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->cfg.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);
static void
iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
{
struct ieee80211_ch_switch_timing *ch_sw;
*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
*buf++ = sizeof(struct ieee80211_ch_switch_timing);
ch_sw = (void *)buf;
ch_sw->switch_time = cpu_to_le16(switch_time);
ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
}
/* find switch timing IE in SKB ready for Tx */
static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
{
struct ieee80211_tdls_data *tf;
const u8 *ie_start;
/*
* Get the offset for the new location of the switch timing IE.
* The SKB network header will now point to the "payload_type"
* element of the TDLS data frame struct.
*/
tf = container_of(skb->data + skb_network_offset(skb),
struct ieee80211_tdls_data, payload_type);
ie_start = tf->u.chan_switch_req.variable;
return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
skb->len - (ie_start - skb->data));
}
static struct sk_buff *
ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
struct cfg80211_chan_def *chandef,
u32 *ch_sw_tm_ie_offset)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
2 + sizeof(struct ieee80211_ch_switch_timing)];
int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
u8 *pos = extra_ies;
struct sk_buff *skb;
/*
* if chandef points to a wide channel add a Secondary-Channel
* Offset information element
*/
if (chandef->width == NL80211_CHAN_WIDTH_40) {
struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
bool ht40plus;
*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
*pos++ = sizeof(*sec_chan_ie);
sec_chan_ie = (void *)pos;
ht40plus = cfg80211_get_chandef_type(chandef) ==
NL80211_CHAN_HT40PLUS;
sec_chan_ie->sec_chan_offs = ht40plus ?
IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
IEEE80211_HT_PARAM_CHA_SEC_BELOW;
pos += sizeof(*sec_chan_ie);
extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
}
/* just set the values to 0, this is a template */
iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
0, 0, !sta->sta.tdls_initiator,
extra_ies, extra_ies_len,
oper_class, chandef);
if (!skb)
return NULL;
skb = ieee80211_build_data_template(sdata, skb, 0);
if (IS_ERR(skb)) {
tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
return NULL;
}
if (ch_sw_tm_ie_offset) {
const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
if (!tm_ie) {
tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
dev_kfree_skb_any(skb);
return NULL;
}
*ch_sw_tm_ie_offset = tm_ie - skb->data;
}
tdls_dbg(sdata,
"TDLS channel switch request template for %pM ch %d width %d\n",
sta->sta.addr, chandef->chan->center_freq, chandef->width);
return skb;
}
int
ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
const u8 *addr, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
struct sk_buff *skb = NULL;
u32 ch_sw_tm_ie;
int ret;
if (chandef->chan->freq_offset)
/* this may work, but is untested */
return -EOPNOTSUPP;
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, addr);
if (!sta) {
tdls_dbg(sdata,
"Invalid TDLS peer %pM for channel switch request\n",
addr);
ret = -ENOENT;
goto out;
}
if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
addr);
ret = -ENOTSUPP;
goto out;
}
skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
&ch_sw_tm_ie);
if (!skb) {
ret = -ENOENT;
goto out;
}
ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
chandef, skb, ch_sw_tm_ie);
if (!ret)
set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
out:
mutex_unlock(&local->sta_mtx);
dev_kfree_skb_any(skb);
return ret;
}
void
ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
struct net_device *dev,
const u8 *addr)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, addr);
if (!sta) {
tdls_dbg(sdata,
"Invalid TDLS peer %pM for channel switch cancel\n",
addr);
goto out;
}
if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
addr);
goto out;
}
drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
out:
mutex_unlock(&local->sta_mtx);
}
static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
u32 *ch_sw_tm_ie_offset)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct sk_buff *skb;
u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
/* initial timing are always zero in the template */
iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
0, 0, !sta->sta.tdls_initiator,
extra_ies, sizeof(extra_ies), 0, NULL);
if (!skb)
return NULL;
skb = ieee80211_build_data_template(sdata, skb, 0);
if (IS_ERR(skb)) {
tdls_dbg(sdata,
"Failed building TDLS channel switch resp frame\n");
return NULL;
}
if (ch_sw_tm_ie_offset) {
const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
if (!tm_ie) {
tdls_dbg(sdata,
"No switch timing IE in TDLS switch resp\n");
dev_kfree_skb_any(skb);
return NULL;
}
*ch_sw_tm_ie_offset = tm_ie - skb->data;
}
tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
sta->sta.addr);
return skb;
}
static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee802_11_elems *elems = NULL;
struct sta_info *sta;
struct ieee80211_tdls_data *tf = (void *)skb->data;
bool local_initiator;
struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
struct ieee80211_tdls_ch_sw_params params = {};
int ret;
params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
params.timestamp = rx_status->device_timestamp;
if (skb->len < baselen) {
tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
skb->len);
return -EINVAL;
}
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, tf->sa);
if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
tf->sa);
ret = -EINVAL;
goto out;
}
params.sta = &sta->sta;
params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
if (params.status != 0) {
ret = 0;
goto call_drv;
}
elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
skb->len - baselen, false, NULL, NULL);
if (!elems) {
ret = -ENOMEM;
goto out;
}
if (elems->parse_error) {
tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
ret = -EINVAL;
goto out;
}
if (!elems->ch_sw_timing || !elems->lnk_id) {
tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
ret = -EINVAL;
goto out;
}
/* validate the initiator is set correctly */
local_initiator =
!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
if (local_initiator == sta->sta.tdls_initiator) {
tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
ret = -EINVAL;
goto out;
}
params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
params.tmpl_skb =
ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
if (!params.tmpl_skb) {
ret = -ENOENT;
goto out;
}
ret = 0;
call_drv:
drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
tdls_dbg(sdata,
"TDLS channel switch response received from %pM status %d\n",
tf->sa, params.status);
out:
mutex_unlock(&local->sta_mtx);
dev_kfree_skb_any(params.tmpl_skb);
kfree(elems);
return ret;
}
static int
ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee802_11_elems *elems;
struct cfg80211_chan_def chandef;
struct ieee80211_channel *chan;
enum nl80211_channel_type chan_type;
int freq;
u8 target_channel, oper_class;
bool local_initiator;
struct sta_info *sta;
enum nl80211_band band;
struct ieee80211_tdls_data *tf = (void *)skb->data;
struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
struct ieee80211_tdls_ch_sw_params params = {};
int ret = 0;
params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
params.timestamp = rx_status->device_timestamp;
if (skb->len < baselen) {
tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
skb->len);
return -EINVAL;
}
target_channel = tf->u.chan_switch_req.target_channel;
oper_class = tf->u.chan_switch_req.oper_class;
/*
* We can't easily infer the channel band. The operating class is
* ambiguous - there are multiple tables (US/Europe/JP/Global). The
* solution here is to treat channels with number >14 as 5GHz ones,
* and specifically check for the (oper_class, channel) combinations
* where this doesn't hold. These are thankfully unique according to
* IEEE802.11-2012.
* We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
* valid here.
*/
if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
oper_class == 4 || oper_class == 5 || oper_class == 6) &&
target_channel < 14)
band = NL80211_BAND_5GHZ;
else
band = target_channel < 14 ? NL80211_BAND_2GHZ :
NL80211_BAND_5GHZ;
freq = ieee80211_channel_to_frequency(target_channel, band);
if (freq == 0) {
tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
target_channel);
return -EINVAL;
}
chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
if (!chan) {
tdls_dbg(sdata,
"Unsupported channel for TDLS chan switch: %d\n",
target_channel);
return -EINVAL;
}
elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
skb->len - baselen, false, NULL, NULL);
if (!elems)
return -ENOMEM;
if (elems->parse_error) {
tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
ret = -EINVAL;
goto free;
}
if (!elems->ch_sw_timing || !elems->lnk_id) {
tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
ret = -EINVAL;
goto free;
}
if (!elems->sec_chan_offs) {
chan_type = NL80211_CHAN_HT20;
} else {
switch (elems->sec_chan_offs->sec_chan_offs) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
chan_type = NL80211_CHAN_HT40PLUS;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
chan_type = NL80211_CHAN_HT40MINUS;
break;
default:
chan_type = NL80211_CHAN_HT20;
break;
}
}
cfg80211_chandef_create(&chandef, chan, chan_type);
/* we will be active on the TDLS link */
if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
sdata->wdev.iftype)) {
tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
ret = -EINVAL;
goto free;
}
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, tf->sa);
if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
tf->sa);
ret = -EINVAL;
goto out;
}
params.sta = &sta->sta;
/* validate the initiator is set correctly */
local_initiator =
!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
if (local_initiator == sta->sta.tdls_initiator) {
tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
ret = -EINVAL;
goto out;
}
/* peer should have known better */
if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
elems->sec_chan_offs->sec_chan_offs) {
tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
ret = -ENOTSUPP;
goto out;
}
params.chandef = &chandef;
params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
params.tmpl_skb =
ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
&params.ch_sw_tm_ie);
if (!params.tmpl_skb) {
ret = -ENOENT;
goto out;
}
drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
tdls_dbg(sdata,
"TDLS ch switch request received from %pM ch %d width %d\n",
tf->sa, params.chandef->chan->center_freq,
params.chandef->width);
out:
mutex_unlock(&local->sta_mtx);
dev_kfree_skb_any(params.tmpl_skb);
free:
kfree(elems);
return ret;
}
void
ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_tdls_data *tf = (void *)skb->data;
struct wiphy *wiphy = sdata->local->hw.wiphy;
lockdep_assert_wiphy(wiphy);
/* make sure the driver supports it */
if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
return;
/* we want to access the entire packet */
if (skb_linearize(skb))
return;
/*
* The packet/size was already validated by mac80211 Rx path, only look
* at the action type.
*/
switch (tf->action_code) {
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
ieee80211_process_tdls_channel_switch_req(sdata, skb);
break;
case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
ieee80211_process_tdls_channel_switch_resp(sdata, skb);
break;
default:
WARN_ON_ONCE(1);
return;
}
}
void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
{
struct sta_info *sta;
u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
rcu_read_lock();
list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
continue;
ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
NL80211_TDLS_TEARDOWN, reason,
GFP_ATOMIC);
}
rcu_read_unlock();
}
void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
const u8 *peer, u16 reason)
{
struct ieee80211_sta *sta;
rcu_read_lock();
sta = ieee80211_find_sta(&sdata->vif, peer);
if (!sta || !sta->tdls) {
rcu_read_unlock();
return;
}
rcu_read_unlock();
tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
peer, reason,
ieee80211_get_reason_code_string(reason));
ieee80211_tdls_oper_request(&sdata->vif, peer,
NL80211_TDLS_TEARDOWN,
WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
GFP_ATOMIC);
}
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