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authorMenglong Dong <imagedong@tencent.com>2022-09-27 22:31:57 +0300
committerJakub Kicinski <kuba@kernel.org>2022-09-29 05:05:21 +0300
commit26d3e21ce1aab6cb19069c510fac8e7474445b18 (patch)
tree6c17560f92ea8d98d1bd6722ded76537c43678ab /net/mptcp
parent3e1308a7c88ba149baa08ddffedee30c6b3224a0 (diff)
downloadlinux-26d3e21ce1aab6cb19069c510fac8e7474445b18.tar.xz
mptcp: factor out __mptcp_close() without socket lock
Factor out __mptcp_close() from mptcp_close(). The caller of __mptcp_close() should hold the socket lock, and cancel mptcp work when __mptcp_close() returns true. This function will be used in the next commit. Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests") Fixes: 6aeed9045071 ("mptcp: fix race on unaccepted mptcp sockets") Cc: stable@vger.kernel.org Reviewed-by: Jiang Biao <benbjiang@tencent.com> Reviewed-by: Mengen Sun <mengensun@tencent.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Menglong Dong <imagedong@tencent.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/protocol.c14
-rw-r--r--net/mptcp/protocol.h1
2 files changed, 13 insertions, 2 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 969b33a9dd64..f7690414320a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2802,13 +2802,12 @@ static void __mptcp_destroy_sock(struct sock *sk)
sock_put(sk);
}
-static void mptcp_close(struct sock *sk, long timeout)
+bool __mptcp_close(struct sock *sk, long timeout)
{
struct mptcp_subflow_context *subflow;
struct mptcp_sock *msk = mptcp_sk(sk);
bool do_cancel_work = false;
- lock_sock(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) {
@@ -2850,6 +2849,17 @@ cleanup:
} else {
mptcp_reset_timeout(msk, 0);
}
+
+ return do_cancel_work;
+}
+
+static void mptcp_close(struct sock *sk, long timeout)
+{
+ bool do_cancel_work;
+
+ lock_sock(sk);
+
+ do_cancel_work = __mptcp_close(sk, timeout);
release_sock(sk);
if (do_cancel_work)
mptcp_cancel_work(sk);
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 132d50833df1..8f123d450c76 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -612,6 +612,7 @@ void mptcp_subflow_reset(struct sock *ssk);
void mptcp_subflow_queue_clean(struct sock *ssk);
void mptcp_sock_graft(struct sock *sk, struct socket *parent);
struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
+bool __mptcp_close(struct sock *sk, long timeout);
bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
const struct mptcp_addr_info *b, bool use_port);