netdev - [PATCH wpan v2 2/6] ieee802154: Convert scan error messages to extack

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Date:   Tue, 14 Feb 2023 14:50:31 +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 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>,
        Guilhem Imberton <guilhem.imberton@...vo.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH wpan v2 2/6] ieee802154: Convert scan error messages to extack

Instead of printing error messages in the kernel log, let's use extack.
When there is a netlink error returned that could be further specified
with a string, use extack as well.

Apply this logic to the very recent scan/beacon infrastructure.

Fixes: ed3557c947e1 ("ieee802154: Add support for user scanning requests")
Fixes: 9bc114504b07 ("ieee802154: Add support for user beaconing requests")
Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 net/ieee802154/nl802154.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 64fa811e1f0b..d3b6e9e80941 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1407,9 +1407,15 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 	u8 type;
 	int err;
 
-	/* Monitors are not allowed to perform scans */
-	if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
+	if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR) {
+		NL_SET_ERR_MSG(info->extack, "Monitors are not allowed to perform scans");
 		return -EPERM;
+	}
+
+	if (!nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
+		NL_SET_ERR_MSG(info->extack, "Malformed request, missing scan type");
+		return -EINVAL;
+	}
 
 	request = kzalloc(sizeof(*request), GFP_KERNEL);
 	if (!request)
@@ -1424,7 +1430,7 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 		request->type = type;
 		break;
 	default:
-		pr_err("Unsupported scan type: %d\n", type);
+		NL_SET_ERR_MSG_FMT(info->extack, "Unsupported scan type: %d", type);
 		err = -EINVAL;
 		goto free_request;
 	}
@@ -1576,12 +1582,13 @@ nl802154_send_beacons(struct sk_buff *skb, struct genl_info *info)
 	struct cfg802154_beacon_request *request;
 	int err;
 
-	/* Only coordinators can send beacons */
-	if (wpan_dev->iftype != NL802154_IFTYPE_COORD)
+	if (wpan_dev->iftype != NL802154_IFTYPE_COORD) {
+		NL_SET_ERR_MSG(info->extack, "Only coordinators can send beacons");
 		return -EOPNOTSUPP;
+	}
 
 	if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
-		pr_err("Device is not part of any PAN\n");
+		NL_SET_ERR_MSG(info->extack, "Device is not part of any PAN");
 		return -EPERM;
 	}
 
-- 
2.34.1