[PATCHv3 1/4] mac80211: make mgmt_tx accept a NULL channel

[PATCHv3 1/4] mac80211: make mgmt_tx accept a NULL channel

[Antonio Quartulli]

From: Antonio Quartulli <antonio@open-mesh.com>

cfg80211 passes a NULL channel to mgmt_tx if the frame has
to be sent on the one currently in use by the device.
Make the implementation of mgmt_tx correctly handle this
case. Fail if offchan is required.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
---
 net/mac80211/cfg.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 3062210..617c5c8 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2838,6 +2838,12 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		return -EOPNOTSUPP;
 	}
 
+	/* configurations requiring offchan cannot work if no channel has been
+	 * specified
+	 */
+	if (need_offchan && !chan)
+		return -EINVAL;
+
 	mutex_lock(&local->mtx);
 
 	/* Check if the operating channel is the requested channel */
@@ -2847,10 +2853,14 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		rcu_read_lock();
 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 
-		if (chanctx_conf)
-			need_offchan = chan != chanctx_conf->def.chan;
-		else
+		if (chanctx_conf) {
+			need_offchan = chan && (chan != chanctx_conf->def.chan);
+		} else if (!chan) {
+			ret = -EINVAL;
+			goto out_unlock;
+		} else {
 			need_offchan = true;
+		}
 		rcu_read_unlock();
 	}
 
-- 
1.8.1.5

[PATCHv3 2/4] brcm80211: make mgmt_tx in brcmfmac accept a NULL channel

[Antonio Quartulli]

From: Antonio Quartulli <antonio@open-mesh.com>

cfg80211 passes a NULL channel to mgmt_tx if the frame has
to be sent on the one currently in use by the device.
Make the implementation of mgmt_tx correctly handle this
case

Cc: Arend van Spriel <arend@broadcom.com>
Cc: brcm80211-dev-list@broadcom.com
Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
---

v3:
- read current freq from the firmware via BRCMF_C_GET_CHANNEL


 drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
index 6d758f2..8bd256b 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
@@ -3917,6 +3917,7 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 	struct brcmf_fil_af_params_le *af_params;
 	bool ack;
 	s32 chan_nr;
+	u32 freq;
 
 	brcmf_dbg(TRACE, "Enter\n");
 
@@ -3929,6 +3930,8 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		return -EPERM;
 	}
 
+	vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
+
 	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
 		/* Right now the only reason to get a probe response */
 		/* is for p2p listen response or for p2p GO from     */
@@ -3944,7 +3947,6 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		ie_offset =  DOT11_MGMT_HDR_LEN +
 			     DOT11_BCN_PRB_FIXED_LEN;
 		ie_len = len - ie_offset;
-		vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
 		if (vif == cfg->p2p.bss_idx[P2PAPI_BSSCFG_PRIMARY].vif)
 			vif = cfg->p2p.bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
 		err = brcmf_vif_set_mgmt_ie(vif,
@@ -3968,8 +3970,15 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		memcpy(&af_params->bssid[0], &mgmt->bssid[0], ETH_ALEN);
 		/* Add the length exepted for 802.11 header  */
 		action_frame->len = cpu_to_le16(len - DOT11_MGMT_HDR_LEN);
-		/* Add the channel */
-		chan_nr = ieee80211_frequency_to_channel(chan->center_freq);
+		/* Add the channel. Use the one specified as parameter if any or
+		 * the current one (got from the firmware) otherwise
+		 */
+		if (chan)
+			freq = chan->center_freq;
+		else
+			brcmf_fil_cmd_int_get(vif->ifp, BRCMF_C_GET_CHANNEL,
+					      &freq);
+		chan_nr = ieee80211_frequency_to_channel(freq);
 		af_params->channel = cpu_to_le32(chan_nr);
 
 		memcpy(action_frame->data, &buf[DOT11_MGMT_HDR_LEN],
-- 
1.8.1.5

[PATCHv3 3/4] ath6kl: make mgmt_tx accept a NULL channel

[Antonio Quartulli]

From: Antonio Quartulli <antonio@open-mesh.com>

cfg80211 passes a NULL channel to mgmt_tx if the frame has
to be sent on the one currently in use by the device.
Make the implementation of mgmt_tx correctly handle this
case

Cc: Kalle Valo <kvalo@qca.qualcomm.com>
Cc: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
---
 drivers/net/wireless/ath/ath6kl/cfg80211.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/ath/ath6kl/cfg80211.c b/drivers/net/wireless/ath/ath6kl/cfg80211.c
index f7995b2..b542203 100644
--- a/drivers/net/wireless/ath/ath6kl/cfg80211.c
+++ b/drivers/net/wireless/ath/ath6kl/cfg80211.c
@@ -3175,10 +3175,17 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 {
 	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
 	struct ath6kl *ar = ath6kl_priv(vif->ndev);
-	u32 id;
+	u32 id, freq;
 	const struct ieee80211_mgmt *mgmt;
 	bool more_data, queued;
 
+	/* default to the current channel, but use the one specified as argument
+	 * if any
+	 */
+	freq = vif->ch_hint;
+	if (chan)
+		freq = chan->center_freq;
+
 	mgmt = (const struct ieee80211_mgmt *) buf;
 	if (vif->nw_type == AP_NETWORK && test_bit(CONNECTED, &vif->flags) &&
 	    ieee80211_is_probe_resp(mgmt->frame_control) &&
@@ -3188,8 +3195,7 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		 * command to allow the target to fill in the generic IEs.
 		 */
 		*cookie = 0; /* TX status not supported */
-		return ath6kl_send_go_probe_resp(vif, buf, len,
-						 chan->center_freq);
+		return ath6kl_send_go_probe_resp(vif, buf, len, freq);
 	}
 
 	id = vif->send_action_id++;
@@ -3205,17 +3211,14 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 
 	/* AP mode Power saving processing */
 	if (vif->nw_type == AP_NETWORK) {
-		queued = ath6kl_mgmt_powersave_ap(vif,
-					id, chan->center_freq,
-					wait, buf,
-					len, &more_data, no_cck);
+		queued = ath6kl_mgmt_powersave_ap(vif, id, freq, wait, buf, len,
+						  &more_data, no_cck);
 		if (queued)
 			return 0;
 	}
 
-	return ath6kl_wmi_send_mgmt_cmd(ar->wmi, vif->fw_vif_idx, id,
-					chan->center_freq, wait,
-					buf, len, no_cck);
+	return ath6kl_wmi_send_mgmt_cmd(ar->wmi, vif->fw_vif_idx, id, freq,
+					wait, buf, len, no_cck);
 }
 
 static void ath6kl_mgmt_frame_register(struct wiphy *wiphy,
-- 
1.8.1.5

[PATCHv3 4/4] nl80211: allow sending CMD_FRAME without specifying any frequency

[Antonio Quartulli]

From: Antonio Quartulli <antonio@open-mesh.com>

Users may want to send a frame on the current channel
without specifying it.

This is particularly useful for the correct implementation
of the IBSS/RSN support in wpa_supplicant which requires to
receive and send AUTH frames.

Make mgmt_tx pass a NULL channel to the driver if none has
been specified by the user.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
---

v3:
- moved from 1/4 to 4/4

 net/wireless/nl80211.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 88e820b..06af395 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7139,6 +7139,9 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
 		return -EOPNOTSUPP;
 
 	switch (wdev->iftype) {
+	case NL80211_IFTYPE_P2P_DEVICE:
+		if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
+			return -EINVAL;
 	case NL80211_IFTYPE_STATION:
 	case NL80211_IFTYPE_ADHOC:
 	case NL80211_IFTYPE_P2P_CLIENT:
@@ -7146,7 +7149,6 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
 	case NL80211_IFTYPE_AP_VLAN:
 	case NL80211_IFTYPE_MESH_POINT:
 	case NL80211_IFTYPE_P2P_GO:
-	case NL80211_IFTYPE_P2P_DEVICE:
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -7174,9 +7176,15 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
 
 	no_cck = nla_get_flag(info->attrs[NL80211_ATTR_TX_NO_CCK_RATE]);
 
-	err = nl80211_parse_chandef(rdev, info, &chandef);
-	if (err)
-		return err;
+	/* get the channel if any has been specified, otherwise pass NULL to
+	 * the driver. The latter will use the current one
+	 */
+	chandef.chan = NULL;
+	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
+		err = nl80211_parse_chandef(rdev, info, &chandef);
+		if (err)
+			return err;
+	}
 
 	if (!dont_wait_for_ack) {
 		msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-- 
1.8.1.5

Re: [PATCHv3 3/4] ath6kl: make mgmt_tx accept a NULL channel

[Kalle Valo]

Antonio Quartulli <ordex@autistici.org> writes:

> From: Antonio Quartulli <antonio@open-mesh.com>
>
> cfg80211 passes a NULL channel to mgmt_tx if the frame has
> to be sent on the one currently in use by the device.
> Make the implementation of mgmt_tx correctly handle this
> case
>
> Cc: Kalle Valo <kvalo@qca.qualcomm.com>
> Cc: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>

[...]

> @@ -3175,10 +3175,17 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
>  {
>  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
>  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
> -	u32 id;
> +	u32 id, freq;
>  	const struct ieee80211_mgmt *mgmt;
>  	bool more_data, queued;
>  
> +	/* default to the current channel, but use the one specified as argument
> +	 * if any
> +	 */
> +	freq = vif->ch_hint;
> +	if (chan)
> +		freq = chan->center_freq;

Can you please add a check here:

if (WARN_ON(chan == 0))
   return -EINVAL;

Just like Arend, I want to be sure that we don't submit value 0 to the
firmware.

-- 
Kalle Valo

Re: [PATCHv3 3/4] ath6kl: make mgmt_tx accept a NULL channel

[Antonio Quartulli]

[-- Attachment #1: Type: text/plain, Size: 1575 bytes --]

On Wed, Jun 05, 2013 at 07:48:15AM -0700, Kalle Valo wrote:
> Antonio Quartulli <ordex@autistici.org> writes:
> 
> > From: Antonio Quartulli <antonio@open-mesh.com>
> >
> > cfg80211 passes a NULL channel to mgmt_tx if the frame has
> > to be sent on the one currently in use by the device.
> > Make the implementation of mgmt_tx correctly handle this
> > case
> >
> > Cc: Kalle Valo <kvalo@qca.qualcomm.com>
> > Cc: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
> > Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
> 
> [...]
> 
> > @@ -3175,10 +3175,17 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
> >  {
> >  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
> >  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
> > -	u32 id;
> > +	u32 id, freq;
> >  	const struct ieee80211_mgmt *mgmt;
> >  	bool more_data, queued;
> >  
> > +	/* default to the current channel, but use the one specified as argument
> > +	 * if any
> > +	 */
> > +	freq = vif->ch_hint;
> > +	if (chan)
> > +		freq = chan->center_freq;
> 
> Can you please add a check here:
> 
> if (WARN_ON(chan == 0))
>    return -EINVAL;

I think you meant (freq == 0) ?

> 
> Just like Arend, I want to be sure that we don't submit value 0 to the
> firmware.

Yeah ok. In ath6kl, are you aware of any "firmware command" to get the channel
from the device like I did for brcmfmac ?

I couldn't find any define matching *GET*CHAN*

Regards,

-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

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Re: [PATCHv3 3/4] ath6kl: make mgmt_tx accept a NULL channel

[Kalle Valo]

Antonio Quartulli <antonio@open-mesh.com> writes:

> On Wed, Jun 05, 2013 at 07:48:15AM -0700, Kalle Valo wrote:
>> Antonio Quartulli <ordex@autistici.org> writes:
>> 
>> > From: Antonio Quartulli <antonio@open-mesh.com>
>> >
>> > cfg80211 passes a NULL channel to mgmt_tx if the frame has
>> > to be sent on the one currently in use by the device.
>> > Make the implementation of mgmt_tx correctly handle this
>> > case
>> >
>> > Cc: Kalle Valo <kvalo@qca.qualcomm.com>
>> > Cc: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
>> > Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
>> 
>> [...]
>> 
>> > @@ -3175,10 +3175,17 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
>> >  {
>> >  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
>> >  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
>> > -	u32 id;
>> > +	u32 id, freq;
>> >  	const struct ieee80211_mgmt *mgmt;
>> >  	bool more_data, queued;
>> >  
>> > +	/* default to the current channel, but use the one specified as argument
>> > +	 * if any
>> > +	 */
>> > +	freq = vif->ch_hint;
>> > +	if (chan)
>> > +		freq = chan->center_freq;
>> 
>> Can you please add a check here:
>> 
>> if (WARN_ON(chan == 0))
>>    return -EINVAL;
>
> I think you meant (freq == 0) ?

Yes, thanks for catching that :)

>> Just like Arend, I want to be sure that we don't submit value 0 to the
>> firmware.
>
> Yeah ok. In ath6kl, are you aware of any "firmware command" to get the channel
> from the device like I did for brcmfmac ?
>
> I couldn't find any define matching *GET*CHAN*

I don't recall seeing anything like that.

-- 
Kalle Valo