netdev - [PATCH v2 net-next 4/9] tcp: Restrict SO

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Message-ID: <20250510015652.9931-5-kuniyu@amazon.com>
Date: Fri, 9 May 2025 18:56:27 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Willem de Bruijn <willemb@...gle.com>
CC: Simon Horman <horms@...nel.org>, Christian Brauner <brauner@...nel.org>,
	Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 4/9] tcp: Restrict SO_TXREHASH to TCP socket.

sk->sk_txrehash is only used for TCP.

Let's restrict SO_TXREHASH to TCP to reflect this.

Later, we will make sk_txrehash a part of the union for other
protocol families, so we set 0 explicitly in getsockopt().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/core/sock.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index b64df2463300..5c84a608ddd7 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1276,6 +1276,8 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 		return 0;
 		}
 	case SO_TXREHASH:
+		if (!sk_is_tcp(sk))
+			return -EOPNOTSUPP;
 		if (val < -1 || val > 1)
 			return -EINVAL;
 		if ((u8)val == SOCK_TXREHASH_DEFAULT)
@@ -2102,8 +2104,11 @@ int sk_getsockopt(struct sock *sk, int level, int optname,
 		break;
 
 	case SO_TXREHASH:
-		/* Paired with WRITE_ONCE() in sk_setsockopt() */
-		v.val = READ_ONCE(sk->sk_txrehash);
+		if (sk_is_tcp(sk))
+			/* Paired with WRITE_ONCE() in sk_setsockopt() */
+			v.val = READ_ONCE(sk->sk_txrehash);
+		else
+			v.val = 0;
 		break;
 
 	default:
-- 
2.49.0