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mptcp: propagate fastclose error

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When an mptcp socket is closed due to an incoming FASTCLOSE
option, so specific sk_err is set and later syscall will
fail usually with EPIPE.

Align the current fastclose error handling with TCP reset,
properly setting the socket error according to the current
msk state and propagating such error.

Additionally sendmsg() is currently not handling properly
the sk_err, always returning EPIPE.

Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-09-30 08:59:31 -07:00 committed by David S. Miller
parent 7171e8a1a4
commit 69800e516e
1 changed files with 36 additions and 11 deletions
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47
net/mptcp/protocol.c
View File

@ -1707,7 +1707,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
goto out;
} else if (ret) {
release_sock(ssk);
goto out;
goto do_error;
}
release_sock(ssk);
}
@ -1717,9 +1717,13 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {
ret = sk_stream_wait_connect(sk, &timeo);
if (ret)
goto out;
goto do_error;
}
ret = -EPIPE;
if (unlikely(sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)))
goto do_error;
pfrag = sk_page_frag(sk);
while (msg_data_left(msg)) {
@ -1728,11 +1732,6 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
bool dfrag_collapsed;
size_t psize, offset;
if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) {
ret = -EPIPE;
goto out;
}
/* reuse tail pfrag, if possible, or carve a new one from the
* page allocator
*/
@ -1764,7 +1763,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (copy_page_from_iter(dfrag->page, offset, psize,
&msg->msg_iter) != psize) {
ret = -EFAULT;
goto out;
goto do_error;
}
/* data successfully copied into the write queue */
@ -1796,7 +1795,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
__mptcp_push_pending(sk, msg->msg_flags);
ret = sk_stream_wait_memory(sk, &timeo);
if (ret)
goto out;
goto do_error;
}
if (copied)
@ -1804,7 +1803,14 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
out:
release_sock(sk);
return copied ? : ret;
return copied;
do_error:
if (copied)
goto out;
copied = sk_stream_error(sk, msg->msg_flags, ret);
goto out;
}
static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
@ -2441,12 +2447,31 @@ static void mptcp_check_fastclose(struct mptcp_sock *msk)
unlock_sock_fast(tcp_sk, slow);
}
/* Mirror the tcp_reset() error propagation */
switch (sk->sk_state) {
case TCP_SYN_SENT:
sk->sk_err = ECONNREFUSED;
break;
case TCP_CLOSE_WAIT:
sk->sk_err = EPIPE;
break;
case TCP_CLOSE:
return;
default:
sk->sk_err = ECONNRESET;
}
inet_sk_state_store(sk, TCP_CLOSE);
sk->sk_shutdown = SHUTDOWN_MASK;
smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags);
mptcp_close_wake_up(sk);
/* the calling mptcp_worker will properly destroy the socket */
if (sock_flag(sk, SOCK_DEAD))
return;
sk->sk_state_change(sk);
sk_error_report(sk);
}
static void __mptcp_retrans(struct sock *sk)