netdev - [PATCH wpan-next v2 2/6] net: ieee802154: Ensure only FFDs can become PAN coordinators

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Date:   Fri, 17 Jun 2022 21:32:50 +0200
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 S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH wpan-next v2 2/6] net: ieee802154: Ensure only FFDs can become PAN coordinators

This is a limitation clearly listed in the specification. Now that we
have device types,let's ensure that only FFDs can become PAN
coordinators.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 net/ieee802154/nl802154.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 638bf544f102..0c6fc3385320 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -924,6 +924,9 @@ static int nl802154_new_interface(struct sk_buff *skb, struct genl_info *info)
 			return -EINVAL;
 	}
 
+	if (type == NL802154_IFTYPE_COORD && !cfg802154_is_ffd(rdev))
+		return -EINVAL;
+
 	if (info->attrs[NL802154_ATTR_EXTENDED_ADDR])
 		extended_addr = nla_get_le64(info->attrs[NL802154_ATTR_EXTENDED_ADDR]);
 
-- 
2.34.1