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mac80211: add TDLS QoS param IE on setup-confirm 

When TDLS QoS is supported by the the peer and the local card, add
the WMM parameter IE to the setup-confirm frame. Take the QoS settings
from the current AP, or if unsupported, use the default values from
the specification. This behavior is mandated by IEEE802.11-2012 section
10.22.4.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arik Nemtsov 2014-07-17 17:14:24 +03:00 committed by Johannes Berg
parent 40b861a0ee
commit 6f7eaa47e1
2 changed files with 144 additions and 0 deletions
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20
include/linux/ieee80211.h
View File

@ -1001,6 +1001,26 @@ struct ieee80211_vendor_ie {
u8 oui_type;
} __packed;
struct ieee80211_wmm_ac_param {
u8 aci_aifsn; /* AIFSN, ACM, ACI */
u8 cw; /* ECWmin, ECWmax (CW = 2^ECW - 1) */
__le16 txop_limit;
} __packed;
struct ieee80211_wmm_param_ie {
u8 element_id; /* Element ID: 221 (0xdd); */
u8 len; /* Length: 24 */
/* required fields for WMM version 1 */
u8 oui[3]; /* 00:50:f2 */
u8 oui_type; /* 2 */
u8 oui_subtype; /* 1 */
u8 version; /* 1 for WMM version 1.0 */
u8 qos_info; /* AP/STA specific QoS info */
u8 reserved; /* 0 */
/* AC_BE, AC_BK, AC_VI, AC_VO */
struct ieee80211_wmm_ac_param ac[4];
} __packed;
/* Control frames */
struct ieee80211_rts {
__le16 frame_control;

124
net/mac80211/tdls.c
View File

@ -8,6 +8,7 @@
*/
#include <linux/ieee80211.h>
#include <linux/log2.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
@ -93,6 +94,74 @@ static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
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,
@ -165,6 +234,56 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
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;
size_t offset = 0, noffset;
struct sta_info *sta;
u8 *pos;
rcu_read_lock();
sta = sta_info_get(sdata, peer);
if (WARN_ON_ONCE(!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 &&
test_sta_flag(sta, WLAN_STA_WME))
ieee80211_tdls_add_wmm_param_ie(sdata, skb);
/* 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);
rcu_read_unlock();
}
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,
@ -183,6 +302,11 @@ static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
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)