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From:   John Crispin <john@phrozen.org>
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless@vger.kernel.org, John Crispin <john@phrozen.org>,
        Shashidhar Lakkavalli <slakkavalli@datto.com>
Subject: [PATCH V2 1/2] mac80211: add support for parsing ADDBA_EXT IEs
Date:   Wed, 19 Jun 2019 07:30:19 +0200
Message-Id: <20190619053020.17121-2-john@phrozen.org>
In-Reply-To: <20190619053020.17121-1-john@phrozen.org>
References: <20190619053020.17121-1-john@phrozen.org>
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ADDBA_EXT IEs can be used to negotiate the BA fragmentation level.

Signed-off-by: Shashidhar Lakkavalli <slakkavalli@datto.com>
Signed-off-by: John Crispin <john@phrozen.org>
---
 include/linux/ieee80211.h  | 8 ++++++++
 net/mac80211/ieee80211_i.h | 1 +
 net/mac80211/util.c        | 7 +++++++
 3 files changed, 16 insertions(+)

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 538d502902c0..cf6b69bcbc52 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -884,6 +884,14 @@ struct ieee80211_tpc_report_ie {
 	u8 link_margin;
 } __packed;
 
+#define IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK	GENMASK(2, 1)
+#define IEEE80211_ADDBA_EXT_FRAG_LEVEL_SHIFT	1
+#define IEEE80211_ADDBA_EXT_NO_FRAG		BIT(0)
+
+struct ieee80211_addba_ext_ie {
+	u8 data;
+} __packed;
+
 struct ieee80211_mgmt {
 	__le16 frame_control;
 	__le16 duration;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 9e8474782a60..acbf5384ad15 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1512,6 +1512,7 @@ struct ieee802_11_elems {
 	u8 max_bssid_indicator;
 	u8 dtim_count;
 	u8 dtim_period;
+	const struct ieee80211_addba_ext_ie *addba_ext_ie;
 
 	/* length of them, respectively */
 	u8 ext_capab_len;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 34ce0ed67e59..ddef5d116431 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1203,6 +1203,13 @@ _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 
 			elems->cisco_dtpc_elem = pos;
 			break;
+		case WLAN_EID_ADDBA_EXT:
+			if (elen != sizeof(struct ieee80211_addba_ext_ie)) {
+				elem_parse_failed = true;
+				break;
+			}
+			elems->addba_ext_ie = (void *)pos;
+			break;
 		case WLAN_EID_TIMEOUT_INTERVAL:
 			if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 				elems->timeout_int = (void *)pos;
-- 
2.20.1