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authorPaolo Abeni <pabeni@redhat.com>2021-01-12 18:25:24 +0100
committerJakub Kicinski <kuba@kernel.org>2021-01-12 20:09:19 -0800
commit76e2a55d16259b51116767b28b19d759bff43f72 (patch)
tree58414f66c38aa154beaf29ddee24bb3414a70900 /net
parent20bc80b6f582ad1151c52ca09ab66b472768c9c8 (diff)
mptcp: better msk-level shutdown.
Instead of re-implementing most of inet_shutdown, re-use such helper, and implement the MPTCP-specific bits at the 'proto' level. The msk-level disconnect() can now be invoked, lets provide a suitable implementation. As a side effect, this fixes bad state management for listener sockets. The latter could lead to division by 0 oops since commit ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling"). Fixes: 43b54c6ee382 ("mptcp: Use full MPTCP-level disconnect state machine") Fixes: ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/mptcp/protocol.c62
1 files changed, 17 insertions, 45 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 2ff8c7caf74f..81faeff8f3bb 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2642,11 +2642,12 @@ static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
static int mptcp_disconnect(struct sock *sk, int flags)
{
- /* Should never be called.
- * inet_stream_connect() calls ->disconnect, but that
- * refers to the subflow socket, not the mptcp one.
- */
- WARN_ON_ONCE(1);
+ struct mptcp_subflow_context *subflow;
+ struct mptcp_sock *msk = mptcp_sk(sk);
+
+ __mptcp_flush_join_list(msk);
+ mptcp_for_each_subflow(msk, subflow)
+ tcp_disconnect(mptcp_subflow_tcp_sock(subflow), flags);
return 0;
}
@@ -3089,6 +3090,14 @@ bool mptcp_finish_join(struct sock *ssk)
return true;
}
+static void mptcp_shutdown(struct sock *sk, int how)
+{
+ pr_debug("sk=%p, how=%d", sk, how);
+
+ if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk))
+ __mptcp_wr_shutdown(sk);
+}
+
static struct proto mptcp_prot = {
.name = "MPTCP",
.owner = THIS_MODULE,
@@ -3098,7 +3107,7 @@ static struct proto mptcp_prot = {
.accept = mptcp_accept,
.setsockopt = mptcp_setsockopt,
.getsockopt = mptcp_getsockopt,
- .shutdown = tcp_shutdown,
+ .shutdown = mptcp_shutdown,
.destroy = mptcp_destroy,
.sendmsg = mptcp_sendmsg,
.recvmsg = mptcp_recvmsg,
@@ -3344,43 +3353,6 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
return mask;
}
-static int mptcp_shutdown(struct socket *sock, int how)
-{
- struct mptcp_sock *msk = mptcp_sk(sock->sk);
- struct sock *sk = sock->sk;
- int ret = 0;
-
- pr_debug("sk=%p, how=%d", msk, how);
-
- lock_sock(sk);
-
- how++;
- if ((how & ~SHUTDOWN_MASK) || !how) {
- ret = -EINVAL;
- goto out_unlock;
- }
-
- if (sock->state == SS_CONNECTING) {
- if ((1 << sk->sk_state) &
- (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
- sock->state = SS_DISCONNECTING;
- else
- sock->state = SS_CONNECTED;
- }
-
- sk->sk_shutdown |= how;
- if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk))
- __mptcp_wr_shutdown(sk);
-
- /* Wake up anyone sleeping in poll. */
- sk->sk_state_change(sk);
-
-out_unlock:
- release_sock(sk);
-
- return ret;
-}
-
static const struct proto_ops mptcp_stream_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
@@ -3394,7 +3366,7 @@ static const struct proto_ops mptcp_stream_ops = {
.ioctl = inet_ioctl,
.gettstamp = sock_gettstamp,
.listen = mptcp_listen,
- .shutdown = mptcp_shutdown,
+ .shutdown = inet_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet_sendmsg,
@@ -3444,7 +3416,7 @@ static const struct proto_ops mptcp_v6_stream_ops = {
.ioctl = inet6_ioctl,
.gettstamp = sock_gettstamp,
.listen = mptcp_listen,
- .shutdown = mptcp_shutdown,
+ .shutdown = inet_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet6_sendmsg,