netdev - [PATCH wpan-next 3/5] mac802154: Only allow PAN controllers to process association requests

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Date: Tue, 28 Nov 2023 12:16:53 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Alexander Aring <alex.aring@...il.com>,
	Stefan Schmidt <stefan@...enfreihafen.org>,
	linux-wpan@...r.kernel.org
Cc: David Girault <david.girault@...vo.com>,
	Romuald Despres <romuald.despres@...vo.com>,
	Frederic Blain <frederic.blain@...vo.com>,
	Nicolas Schodet <nico@...fr.eu.org>,
	Guilhem Imberton <guilhem.imberton@...vo.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev@...r.kernel.org,
	Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH wpan-next 3/5] mac802154: Only allow PAN controllers to process association requests

It is not very clear in the specification whether simple coordinators
are allowed or not to answer to association requests themselves. As
there is no synchronization mechanism, it is probably best to rely on
the relay feature of these coordinators and avoid processing them in
this case.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 net/mac802154/scan.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
index 5873da634fb4..1c0eeaa76560 100644
--- a/net/mac802154/scan.c
+++ b/net/mac802154/scan.c
@@ -781,6 +781,12 @@ int mac802154_process_association_req(struct ieee802154_sub_if_data *sdata,
 		 unlikely(dest->short_addr != wpan_dev->short_addr))
 		return -ENODEV;
 
+	if (wpan_dev->parent) {
+		dev_dbg(&sdata->dev->dev,
+			"Ignoring ASSOC REQ, not the PAN coordinator\n");
+		return -ENODEV;
+	}
+
 	mutex_lock(&wpan_dev->association_lock);
 
 	memcpy(&assoc_req_pl, skb->data, sizeof(assoc_req_pl));
-- 
2.34.1