Commit 7443dcd1 authored by Aloka Dixit's avatar Aloka Dixit Committed by Johannes Berg
Browse files

nl80211: Unsolicited broadcast probe response support 



This patch adds new attributes to support unsolicited broadcast
probe response transmission used for in-band
discovery in 6GHz band (IEEE P802.11ax/D6.0 26.17.2.3.2, AP behavior for
fast passive scanning).
The new attribute, NL80211_ATTR_UNSOL_BCAST_PROBE_RESP, is nested which
supports following parameters:
(1) NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT - Packet interval
(2) NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL - Template data

Signed-off-by: default avatarAloka Dixit <alokad@codeaurora.org>
Link: https://lore.kernel.org/r/010101747a946698-aac263ae-2ed3-4dab-9590-0bc7131214e1-000000@us-west-2.amazonses.com


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 295b02c4

include/net/cfg80211.h

+18 −0
Original line number Diff line number Diff line
@@ -1099,6 +1099,22 @@ struct cfg80211_fils_discovery { 
	const u8 *tmpl;

};



/**

 * struct cfg80211_unsol_bcast_probe_resp - Unsolicited broadcast probe

 *	response parameters in 6GHz.

 *

 * @interval: Packet interval in TUs. Maximum allowed is 20 TU, as mentioned

 *	in IEEE P802.11ax/D6.0 26.17.2.3.2 - AP behavior for fast passive

 *	scanning

 * @tmpl_len: Template length

 * @tmpl: Template data for probe response

 */

struct cfg80211_unsol_bcast_probe_resp {

	u32 interval;

	size_t tmpl_len;

	const u8 *tmpl;

};



/**

 * enum cfg80211_ap_settings_flags - AP settings flags

 *
@@ -1147,6 +1163,7 @@ enum cfg80211_ap_settings_flags { 
 * @he_bss_color: BSS Color settings

 * @he_oper: HE operation IE (or %NULL if HE isn't enabled)

 * @fils_discovery: FILS discovery transmission parameters

 * @unsol_bcast_probe_resp: Unsolicited broadcast probe response parameters

 */

struct cfg80211_ap_settings {

	struct cfg80211_chan_def chandef;
@@ -1178,6 +1195,7 @@ struct cfg80211_ap_settings { 
	struct ieee80211_he_obss_pd he_obss_pd;

	struct cfg80211_he_bss_color he_bss_color;

	struct cfg80211_fils_discovery fils_discovery;

	struct cfg80211_unsol_bcast_probe_resp unsol_bcast_probe_resp;

};



/**

include/uapi/linux/nl80211.h

+36 −0
Original line number Diff line number Diff line
@@ -2517,6 +2517,10 @@ enum nl80211_commands { 
 *	discovery. It is a nested attribute, see

 *	&enum nl80211_fils_discovery_attributes.

 *

 * @NL80211_ATTR_UNSOL_BCAST_PROBE_RESP: Optional parameter to configure

 *	unsolicited broadcast probe response. It is a nested attribute, see

 *	&enum nl80211_unsol_bcast_probe_resp_attributes.

 *

 * @NUM_NL80211_ATTR: total number of nl80211_attrs available

 * @NL80211_ATTR_MAX: highest attribute number currently defined

 * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3001,6 +3005,8 @@ enum nl80211_attrs { 


	NL80211_ATTR_FILS_DISCOVERY,



	NL80211_ATTR_UNSOL_BCAST_PROBE_RESP,



	/* add attributes here, update the policy in nl80211.c */



	__NL80211_ATTR_AFTER_LAST,
@@ -5876,6 +5882,9 @@ enum nl80211_feature_flags { 
 * @NL80211_EXT_FEATURE_FILS_DISCOVERY: Driver/device supports FILS discovery

 *	frames transmission

 *

 * @NL80211_EXT_FEATURE_UNSOL_BCAST_PROBE_RESP: Driver/device supports

 *	unsolicited broadcast probe response transmission

 *

 * @NUM_NL80211_EXT_FEATURES: number of extended features.

 * @MAX_NL80211_EXT_FEATURES: highest extended feature index.

 */
@@ -5935,6 +5944,7 @@ enum nl80211_ext_feature_index { 
	NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_PSK,

	NL80211_EXT_FEATURE_SAE_OFFLOAD_AP,

	NL80211_EXT_FEATURE_FILS_DISCOVERY,

	NL80211_EXT_FEATURE_UNSOL_BCAST_PROBE_RESP,



	/* add new features before the definition below */

	NUM_NL80211_EXT_FEATURES,
@@ -7063,4 +7073,30 @@ enum nl80211_fils_discovery_attributes { 
 */

#define NL80211_FILS_DISCOVERY_TMPL_MIN_LEN 42



/**

 * enum nl80211_unsol_bcast_probe_resp_attributes - Unsolicited broadcast probe

 *	response configuration. Applicable only in 6GHz.

 *

 * @__NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INVALID: Invalid

 *

 * @NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT: Maximum packet interval (u32, TU).

 *	Allowed range: 0..20 (TU = Time Unit). IEEE P802.11ax/D6.0

 *	26.17.2.3.2 (AP behavior for fast passive scanning).

 * @NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL: Unsolicited broadcast probe response

 *	frame template (binary).

 *

 * @__NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_LAST: Internal

 * @NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_MAX: highest attribute

 */

enum nl80211_unsol_bcast_probe_resp_attributes {

	__NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INVALID,



	NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT,

	NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL,



	/* keep last */

	__NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_LAST,

	NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_MAX =

		__NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_LAST - 1

};

#endif /* __LINUX_NL80211_H */

net/wireless/nl80211.c

+46 −0
Original line number Diff line number Diff line
@@ -385,6 +385,13 @@ nl80211_fils_discovery_policy[NL80211_FILS_DISCOVERY_ATTR_MAX + 1] = { 
			 IEEE80211_MAX_DATA_LEN),

};



static const struct nla_policy

nl80211_unsol_bcast_probe_resp_policy[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_MAX + 1] = {

	[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT] = NLA_POLICY_MAX(NLA_U32, 20),

	[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL] = { .type = NLA_BINARY,

						       .len = IEEE80211_MAX_DATA_LEN }

};



static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {

	[0] = { .strict_start_type = NL80211_ATTR_HE_OBSS_PD },

	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
@@ -695,6 +702,8 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = { 
		NLA_POLICY_EXACT_LEN(sizeof(struct ieee80211_he_6ghz_capa)),

	[NL80211_ATTR_FILS_DISCOVERY] =

		NLA_POLICY_NESTED(nl80211_fils_discovery_policy),

	[NL80211_ATTR_UNSOL_BCAST_PROBE_RESP] =

		NLA_POLICY_NESTED(nl80211_unsol_bcast_probe_resp_policy),

};



/* policy for the key attributes */
@@ -4915,6 +4924,35 @@ static int nl80211_parse_fils_discovery(struct cfg80211_registered_device *rdev, 
	return 0;

}



static int

nl80211_parse_unsol_bcast_probe_resp(struct cfg80211_registered_device *rdev,

				     struct nlattr *attrs,

				     struct cfg80211_ap_settings *params)

{

	struct nlattr *tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_MAX + 1];

	int ret;

	struct cfg80211_unsol_bcast_probe_resp *presp =

					&params->unsol_bcast_probe_resp;



	if (!wiphy_ext_feature_isset(&rdev->wiphy,

				     NL80211_EXT_FEATURE_UNSOL_BCAST_PROBE_RESP))

		return -EINVAL;



	ret = nla_parse_nested(tb, NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_MAX,

			       attrs, NULL, NULL);

	if (ret)

		return ret;



	if (!tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT] ||

	    !tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL])

		return -EINVAL;



	presp->tmpl = nla_data(tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL]);

	presp->tmpl_len = nla_len(tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_TMPL]);

	presp->interval = nla_get_u32(tb[NL80211_UNSOL_BCAST_PROBE_RESP_ATTR_INT]);

	return 0;

}



static void nl80211_check_ap_rate_selectors(struct cfg80211_ap_settings *params,

					    const u8 *rates)

{
@@ -5231,6 +5269,14 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info) 
			goto out;

	}



	if (info->attrs[NL80211_ATTR_UNSOL_BCAST_PROBE_RESP]) {

		err = nl80211_parse_unsol_bcast_probe_resp(

			rdev, info->attrs[NL80211_ATTR_UNSOL_BCAST_PROBE_RESP],

			&params);

		if (err)

			return err;

	}



	nl80211_calculate_ap_params(&params);



	if (info->attrs[NL80211_ATTR_EXTERNAL_AUTH_SUPPORT])

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