linux-kernel - [PATCH net-next v02 1/2] af_packet: allow fanout

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Message-ID: <05852e3043d2b0a7a5ca51d456e82966dcb72f03.1728382839.git.gur.stavi@huawei.com>
Date: Tue, 8 Oct 2024 13:27:58 +0300
From: Gur Stavi <gur.stavi@...wei.com>
To: Gur Stavi <gur.stavi@...wei.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Shuah Khan
	<shuah@...nel.org>, Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	<linux-kselftest@...r.kernel.org>
Subject: [PATCH net-next v02 1/2] af_packet: allow fanout_add when socket is not RUNNING

PACKET socket can retain its fanout membership through link down and up
and leave a fanout while closed regardless of link state.
However, socket was forbidden from joining a fanout while it was not
RUNNING.

This patch allows PACKET socket to join fanout while not RUNNING.

Signed-off-by: Gur Stavi <gur.stavi@...wei.com>
---
 net/packet/af_packet.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index f8942062f776..fb2cca73d953 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1846,21 +1846,21 @@ static int fanout_add(struct sock *sk, struct fanout_args *args)
 	err = -EINVAL;
 
 	spin_lock(&po->bind_lock);
-	if (packet_sock_flag(po, PACKET_SOCK_RUNNING) &&
-	    match->type == type &&
+	if (match->type == type &&
 	    match->prot_hook.type == po->prot_hook.type &&
 	    match->prot_hook.dev == po->prot_hook.dev) {
 		err = -ENOSPC;
 		if (refcount_read(&match->sk_ref) < match->max_num_members) {
-			__dev_remove_pack(&po->prot_hook);
-
 			/* Paired with packet_setsockopt(PACKET_FANOUT_DATA) */
 			WRITE_ONCE(po->fanout, match);
 
 			po->rollover = rollover;
 			rollover = NULL;
 			refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
-			__fanout_link(sk, po);
+			if (packet_sock_flag(po, PACKET_SOCK_RUNNING)) {
+				__dev_remove_pack(&po->prot_hook);
+				__fanout_link(sk, po);
+			}
 			err = 0;
 		}
 	}
-- 
2.45.2