netdev - [PATCH net-next 3/8] net: lockless SO_{TYPE|PROTOCOL|DOMAIN|ERROR } setsockopt()

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Date: Thu, 21 Sep 2023 20:28:13 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/8] net: lockless SO_{TYPE|PROTOCOL|DOMAIN|ERROR } setsockopt()

This options can not be set and return -ENOPROTOOPT,
no need to acqure socket lock.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/sock.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index f01c757245683452fd6c30c51b885d09427ef697..4d20b74a93cb57bba58447f37e87b677167b8425 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1135,6 +1135,11 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 	case SO_PASSPIDFD:
 		assign_bit(SOCK_PASSPIDFD, &sock->flags, valbool);
 		return 0;
+	case SO_TYPE:
+	case SO_PROTOCOL:
+	case SO_DOMAIN:
+	case SO_ERROR:
+		return -ENOPROTOOPT;
 	}
 
 	sockopt_lock_sock(sk);
@@ -1152,12 +1157,6 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 	case SO_REUSEPORT:
 		sk->sk_reuseport = valbool;
 		break;
-	case SO_TYPE:
-	case SO_PROTOCOL:
-	case SO_DOMAIN:
-	case SO_ERROR:
-		ret = -ENOPROTOOPT;
-		break;
 	case SO_DONTROUTE:
 		sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
 		sk_dst_reset(sk);
-- 
2.42.0.515.g380fc7ccd1-goog