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
48385351c5983 ("tcp/udp: Call inet6_destroy_sock() in IPv6 ...")
removed it and so ipv6 udp misses the flag.

Cc: <stable@vger.kernel.org> # 6.0
Fixes: cd55d475823c5 ("net: flag sockets supporting msghdr originated zerocopy")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 129ec5a9b0eb7a1f8ae99581bb43eaf2c788b101..bc65e5b7195b3cc0c17f05877896721e70e6984b 100644 (file)
--- 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;
 }