netdev - [PATCH net] netdev-genl: Set extack and fix error on napi-get

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Message-Id: <20240831121707.17562-1-jdamato@fastly.com>
Date: Sat, 31 Aug 2024 12:17:04 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: mkarsten@...terloo.ca,
	Joe Damato <jdamato@...tly.com>,
	Amritha Nambiar <amritha.nambiar@...el.com>,
	stable@...nel.org,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Daniel Jurgens <danielj@...dia.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] netdev-genl: Set extack and fix error on napi-get

In commit 27f91aaf49b3 ("netdev-genl: Add netlink framework functions
for napi"), when an invalid NAPI ID is specified the return value
-EINVAL is used and no extack is set.

Change the return value to -ENOENT and set the extack.

Before this commit:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                          --do napi-get --json='{"id": 451}'
Netlink error: Invalid argument
nl_len = 36 (20) nl_flags = 0x100 nl_type = 2
	error: -22

After this commit:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --do napi-get --json='{"id": 451}'
Netlink error: No such file or directory
nl_len = 44 (28) nl_flags = 0x300 nl_type = 2
	error: -2
	extack: {'bad-attr': '.id'}

Cc: Amritha Nambiar <amritha.nambiar@...el.com>
Cc: stable@...nel.org
Suggested-by: Jakub Kicinski <kuba@...nel.org>
Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi")
Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 net/core/netdev-genl.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 05f9515d2c05..a17d7eaeb001 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -216,10 +216,12 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
 	rtnl_lock();
 
 	napi = napi_by_id(napi_id);
-	if (napi)
+	if (napi) {
 		err = netdev_nl_napi_fill_one(rsp, napi, info);
-	else
-		err = -EINVAL;
+	} else {
+		NL_SET_BAD_ATTR(info->extack, info->attrs[NETDEV_A_NAPI_ID]);
+		err = -ENOENT;
+	}
 
 	rtnl_unlock();
 
-- 
2.25.1