netdev - [PATCH net 1/4] udp: advertise ipv6 udp support for msghdr::ubuf

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Message-Id: <63bd51f76b1951ae1ca387eef514e2d90c329230.1666825799.git.asml.silence@gmail.com>
Date:   Thu, 27 Oct 2022 00:25:56 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>, io-uring@...r.kernel.org,
        John Fastabend <john.fastabend@...il.com>,
        asml.silence@...il.com
Subject: [PATCH net 1/4] udp: advertise ipv6 udp support for msghdr::ubuf_info

Mark udp ipv6 as supporting msghdr::ubuf_info. In the original commit
SOCK_SUPPORT_ZC was supposed to be set by a udp_init_sock() call from
udp6_init_sock(), but
d38afeec26ed4 ("tcp/udp: Call inet6_destroy_sock() in IPv6 ...")
removed it and so ipv6 udp misses the flag.

Cc: <stable@...r.kernel.org> # 6.0
Fixes: e993ffe3da4bc ("net: flag sockets supporting msghdr originated zerocopy")
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/ipv6/udp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 129ec5a9b0eb..bc65e5b7195b 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -66,6 +66,7 @@ int udpv6_init_sock(struct sock *sk)
 {
 	skb_queue_head_init(&udp_sk(sk)->reader_queue);
 	sk->sk_destruct = udpv6_destruct_sock;
+	set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
 	return 0;
 }
 
-- 
2.38.0