This is a note to let you know that I've just added the patch titled
sctp: support MSG_ERRQUEUE flag in recvmsg()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sctp-support-msg_errqueue-flag-in-recvmsg.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 40e5baf01a104efbf56e51e070ef67681aad548b
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Dec 12 14:55:50 2023 +0000
sctp: support MSG_ERRQUEUE flag in recvmsg()
[ Upstream commit 4746b36b1abe11ca32987b2d21e1e770deab17cc ]
For some reason sctp_poll() generates EPOLLERR if sk->sk_error_queue
is not empty but recvmsg() can not drain the error queue yet.
This is needed to better support timestamping.
I had to export inet_recv_error(), since sctp
can be compiled as a module.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Acked-by: Xin Long <lucien.xin@xxxxxxxxx>
Link: https://lore.kernel.org/r/20231212145550.3872051-1-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: a562c0a2d651 ("sctp: fix busy polling")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 347c3768df6e..c13b8ed63f87 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1642,6 +1642,7 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
#endif
return -EINVAL;
}
+EXPORT_SYMBOL(inet_recv_error);
int inet_gro_complete(struct sk_buff *skb, int nhoff)
{
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e25dc1709131..da56832179f0 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2098,6 +2098,9 @@ static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
__func__, sk, msg, len, flags, addr_len);
+ if (unlikely(flags & MSG_ERRQUEUE))
+ return inet_recv_error(sk, msg, len, addr_len);
+
lock_sock(sk);
if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
