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From:   Bassem Dawood <bassem@morsemicro.com>
To:     linux-wireless@vger.kernel.org
Cc:     Kieran Frewen <kieran.frewen@morsemicro.com>,
        kernel test robot <lkp@intel.com>,
        Gilad Itzkovitch <gilad.itzkovitch@morsemicro.com>
Subject: [PATCH v7 1/2] wifi: cfg80211: Add short_beacon_tail/head/period
Date:   Thu, 10 Aug 2023 19:35:55 +1000
Message-Id: <20230810093556.33800-1-bassem@morsemicro.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Kieran Frewen <kieran.frewen@morsemicro.com>

Support variables to handle short beacon period and adding a
separate tail/head for them. Also, add short beacon period,
head and tail attributes for user configuration.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202304131044.Y2mHsqp7-lkp@intel.com/
Signed-off-by: Kieran Frewen <kieran.frewen@morsemicro.com>
Co-developed-by: Gilad Itzkovitch <gilad.itzkovitch@morsemicro.com>
Signed-off-by: Gilad Itzkovitch <gilad.itzkovitch@morsemicro.com>
---
v7:
 - move new nl80211 attributes to the end
v6:
 - update to latest wireless-next
v5:
 - initialise s1g beacon variables to false
v4:
 - squash cfg80211 commits together
 - add protection for short head/tail with S1G band check
 - better validation rule for short_beacon_period
   and align its types
---
 include/net/cfg80211.h       |  10 +++-
 include/uapi/linux/nl80211.h |  10 ++++
 net/wireless/nl80211.c       | 103 ++++++++++++++++++++++++++---------
 3 files changed, 97 insertions(+), 26 deletions(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7c7d03aa9d06..482f455305aa 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1211,8 +1211,13 @@ struct cfg80211_rnr_elems {
  *	or %NULL if not changed
  * @tail: tail portion of beacon (after TIM IE)
  *	or %NULL if not changed
+ * @short_head: head portion of short beacon or %NULL if not changed
+ * @short_tail: short tail portion of beacon (after TIM IE)
+ *	or %NULL if not changed
  * @head_len: length of @head
  * @tail_len: length of @tail
+ * @short_head_len: length of @short_head
+ * @short_tail_len: length of @short_tail
  * @beacon_ies: extra information element(s) to add into Beacon frames or %NULL
  * @beacon_ies_len: length of beacon_ies in octets
  * @proberesp_ies: extra information element(s) to add into Probe Response
@@ -1241,6 +1246,7 @@ struct cfg80211_beacon_data {
 	unsigned int link_id;
 
 	const u8 *head, *tail;
+	const u8 *short_head, *short_tail;
 	const u8 *beacon_ies;
 	const u8 *proberesp_ies;
 	const u8 *assocresp_ies;
@@ -1252,6 +1258,7 @@ struct cfg80211_beacon_data {
 	s8 ftm_responder;
 
 	size_t head_len, tail_len;
+	size_t short_head_len, short_tail_len;
 	size_t beacon_ies_len;
 	size_t proberesp_ies_len;
 	size_t assocresp_ies_len;
@@ -1324,6 +1331,7 @@ struct cfg80211_unsol_bcast_probe_resp {
  * @beacon: beacon data
  * @beacon_interval: beacon interval
  * @dtim_period: DTIM period
+ * @short_beacon_period: S1G short beacon period
  * @ssid: SSID to be used in the BSS (note: may be %NULL if not provided from
  *	user space)
  * @ssid_len: length of @ssid
@@ -1365,7 +1373,7 @@ struct cfg80211_ap_settings {
 
 	struct cfg80211_beacon_data beacon;
 
-	int beacon_interval, dtim_period;
+	int beacon_interval, dtim_period, short_beacon_period;
 	const u8 *ssid;
 	size_t ssid_len;
 	enum nl80211_hidden_ssid hidden_ssid;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 88eb85c63029..d543d1b83072 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2815,6 +2815,12 @@ enum nl80211_commands {
  * @NL80211_ATTR_MLO_LINK_DISABLED: Flag attribute indicating that the link is
  *	disabled.
  *
+ * @NL80211_ATTR_SHORT_BEACON_PERIOD: (u16) period for S1G long beacon
+ * @NL80211_ATTR_SHORT_BEACON_HEAD: portion of the S1G short beacon before
+ *	the TIM element
+ * @NL80211_ATTR_SHORT_BEACON_TAIL: portion of the S1G short beacon after
+ *	the TIM element
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3353,6 +3359,10 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_MLO_LINK_DISABLED,
 
+	NL80211_ATTR_SHORT_BEACON_PERIOD,
+	NL80211_ATTR_SHORT_BEACON_HEAD,
+	NL80211_ATTR_SHORT_BEACON_TAIL,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0da2e6a2a7ea..eedc6f47d74d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -230,13 +230,19 @@ static int validate_beacon_head(const struct nlattr *attr,
 	const struct element *elem;
 	const struct ieee80211_mgmt *mgmt = (void *)data;
 	unsigned int fixedlen, hdrlen;
-	bool s1g_bcn;
+	bool s1g_bcn = false;
+	bool s1g_short_bcn = false;
 
 	if (len < offsetofend(typeof(*mgmt), frame_control))
 		goto err;
 
 	s1g_bcn = ieee80211_is_s1g_beacon(mgmt->frame_control);
-	if (s1g_bcn) {
+	s1g_short_bcn = ieee80211_is_s1g_short_beacon(mgmt->frame_control);
+	if (s1g_short_bcn) {
+		fixedlen = offsetof(struct ieee80211_ext,
+				    u.s1g_short_beacon.variable);
+		hdrlen = offsetof(struct ieee80211_ext, u.s1g_short_beacon);
+	} else if (s1g_bcn) {
 		fixedlen = offsetof(struct ieee80211_ext,
 				    u.s1g_beacon.variable);
 		hdrlen = offsetof(struct ieee80211_ext, u.s1g_beacon);
@@ -263,7 +269,12 @@ static int validate_beacon_head(const struct nlattr *attr,
 		return 0;
 
 err:
-	NL_SET_ERR_MSG_ATTR(extack, attr, "malformed beacon head");
+	if (s1g_short_bcn)
+		NL_SET_ERR_MSG_ATTR(extack, attr, "malformed S1G short beacon head");
+	else if (s1g_bcn)
+		NL_SET_ERR_MSG_ATTR(extack, attr, "malformed S1G beacon head");
+	else
+		NL_SET_ERR_MSG_ATTR(extack, attr, "malformed beacon head");
 	return -EINVAL;
 }
 
@@ -817,6 +828,12 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
 	[NL80211_ATTR_HW_TIMESTAMP_ENABLED] = { .type = NLA_FLAG },
 	[NL80211_ATTR_EMA_RNR_ELEMS] = { .type = NLA_NESTED },
 	[NL80211_ATTR_MLO_LINK_DISABLED] = { .type = NLA_FLAG },
+
+	[NL80211_ATTR_SHORT_BEACON_PERIOD] = NLA_POLICY_MIN(NLA_U16, 1),
+	[NL80211_ATTR_SHORT_BEACON_HEAD] =
+		NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_beacon_head, IEEE80211_MAX_DATA_LEN),
+	[NL80211_ATTR_SHORT_BEACON_TAIL] =
+		NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_ie_attr, IEEE80211_MAX_DATA_LEN),
 };
 
 /* policy for the key attributes */
@@ -5505,7 +5522,8 @@ static int nl80211_parse_he_bss_color(struct nlattr *attrs,
 static int nl80211_parse_beacon(struct cfg80211_registered_device *rdev,
 				struct nlattr *attrs[],
 				struct cfg80211_beacon_data *bcn,
-				struct netlink_ext_ack *extack)
+				struct netlink_ext_ack *extack,
+				bool is_s1g_band)
 {
 	bool haveinfo = false;
 	int err;
@@ -5515,10 +5533,18 @@ static int nl80211_parse_beacon(struct cfg80211_registered_device *rdev,
 	bcn->link_id = nl80211_link_id(attrs);
 
 	if (attrs[NL80211_ATTR_BEACON_HEAD]) {
+		struct ieee80211_mgmt *mgmt;
+
 		bcn->head = nla_data(attrs[NL80211_ATTR_BEACON_HEAD]);
 		bcn->head_len = nla_len(attrs[NL80211_ATTR_BEACON_HEAD]);
 		if (!bcn->head_len)
 			return -EINVAL;
+
+		mgmt = (void *)bcn->head;
+		if (ieee80211_is_s1g_beacon(mgmt->frame_control) && !is_s1g_band)
+			return -EINVAL;
+		else if (ieee80211_is_beacon(mgmt->frame_control) && is_s1g_band)
+			return -EINVAL;
 		haveinfo = true;
 	}
 
@@ -5528,6 +5554,22 @@ static int nl80211_parse_beacon(struct cfg80211_registered_device *rdev,
 		haveinfo = true;
 	}
 
+	if (attrs[NL80211_ATTR_SHORT_BEACON_HEAD]) {
+		if (!is_s1g_band)
+			return -EINVAL;
+		bcn->short_head = nla_data(attrs[NL80211_ATTR_SHORT_BEACON_HEAD]);
+		bcn->short_head_len = nla_len(attrs[NL80211_ATTR_SHORT_BEACON_HEAD]);
+		haveinfo = true;
+	}
+
+	if (attrs[NL80211_ATTR_SHORT_BEACON_TAIL]) {
+		if (!is_s1g_band)
+			return -EINVAL;
+		bcn->short_tail = nla_data(attrs[NL80211_ATTR_SHORT_BEACON_TAIL]);
+		bcn->short_tail_len = nla_len(attrs[NL80211_ATTR_SHORT_BEACON_TAIL]);
+		haveinfo = true;
+	}
+
 	if (!haveinfo)
 		return -EINVAL;
 
@@ -5935,8 +5977,24 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 	if (!params)
 		return -ENOMEM;
 
+	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
+		err = nl80211_parse_chandef(rdev, info, &params->chandef);
+		if (err)
+			goto out;
+	} else if (wdev->valid_links) {
+		/* with MLD need to specify the channel configuration */
+		err = -EINVAL;
+		goto out;
+	} else if (wdev->u.ap.preset_chandef.chan) {
+		params->chandef = wdev->u.ap.preset_chandef;
+	} else if (!nl80211_get_ap_channel(rdev, params)) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = nl80211_parse_beacon(rdev, info->attrs, &params->beacon,
-				   info->extack);
+				   info->extack,
+				   params->chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		goto out;
 
@@ -5944,6 +6002,10 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 		nla_get_u32(info->attrs[NL80211_ATTR_BEACON_INTERVAL]);
 	params->dtim_period =
 		nla_get_u32(info->attrs[NL80211_ATTR_DTIM_PERIOD]);
+	params->short_beacon_period = 1;
+	if (info->attrs[NL80211_ATTR_SHORT_BEACON_PERIOD])
+		params->short_beacon_period =
+			nla_get_u16(info->attrs[NL80211_ATTR_SHORT_BEACON_PERIOD]);
 
 	err = cfg80211_validate_beacon_int(rdev, dev->ieee80211_ptr->iftype,
 					   params->beacon_interval);
@@ -6040,21 +6102,6 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
-	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
-		err = nl80211_parse_chandef(rdev, info, &params->chandef);
-		if (err)
-			goto out;
-	} else if (wdev->valid_links) {
-		/* with MLD need to specify the channel configuration */
-		err = -EINVAL;
-		goto out;
-	} else if (wdev->u.ap.preset_chandef.chan) {
-		params->chandef = wdev->u.ap.preset_chandef;
-	} else if (!nl80211_get_ap_channel(rdev, params)) {
-		err = -EINVAL;
-		goto out;
-	}
-
 	if (info->attrs[NL80211_ATTR_PUNCT_BITMAP]) {
 		err = nl80211_parse_punct_bitmap(rdev, info,
 						 &params->chandef,
@@ -6237,7 +6284,8 @@ static int nl80211_set_beacon(struct sk_buff *skb, struct genl_info *info)
 	if (!wdev->links[link_id].ap.beacon_interval)
 		return -EINVAL;
 
-	err = nl80211_parse_beacon(rdev, info->attrs, &params, info->extack);
+	err = nl80211_parse_beacon(rdev, info->attrs, &params, info->extack,
+		wdev->links[link_id].ap.chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		goto out;
 
@@ -10131,7 +10179,8 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
 		goto skip_beacons;
 
 	err = nl80211_parse_beacon(rdev, info->attrs, &params.beacon_after,
-				   info->extack);
+		info->extack,
+		wdev->links[link_id].ap.chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		goto free;
 
@@ -10149,7 +10198,8 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
 		goto free;
 
 	err = nl80211_parse_beacon(rdev, csa_attrs, &params.beacon_csa,
-				   info->extack);
+		info->extack,
+		wdev->links[link_id].ap.chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		goto free;
 
@@ -15976,6 +16026,7 @@ static int nl80211_color_change(struct sk_buff *skb, struct genl_info *info)
 	struct cfg80211_color_change_settings params = {};
 	struct net_device *dev = info->user_ptr[1];
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	unsigned int link_id = nl80211_link_id(info->attrs);
 	struct nlattr **tb;
 	u16 offset;
 	int err;
@@ -15999,7 +16050,8 @@ static int nl80211_color_change(struct sk_buff *skb, struct genl_info *info)
 	params.color = nla_get_u8(info->attrs[NL80211_ATTR_COLOR_CHANGE_COLOR]);
 
 	err = nl80211_parse_beacon(rdev, info->attrs, &params.beacon_next,
-				   info->extack);
+		info->extack,
+		wdev->links[link_id].ap.chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		return err;
 
@@ -16014,7 +16066,8 @@ static int nl80211_color_change(struct sk_buff *skb, struct genl_info *info)
 		goto out;
 
 	err = nl80211_parse_beacon(rdev, tb, &params.beacon_color_change,
-				   info->extack);
+		info->extack,
+		wdev->links[link_id].ap.chandef.chan->band == NL80211_BAND_S1GHZ);
 	if (err)
 		goto out;
 
-- 
2.25.1