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Merge branch 'mptcp-a-bunch-of-fixes' 

Paolo Abeni says:

====================
mptcp: a bunch of fixes

This patch series pulls together a few bugfixes for MPTCP bug observed while
doing stress-test with apache bench - forced to use MPTCP and multiple
subflows.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-05-30 21:39:13 -07:00
parent 05aa69e5cb c5c79763fa
commit e237659cfe
1 changed files with 46 additions and 18 deletions
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64
net/mptcp/protocol.c
View File

@ -1263,11 +1263,14 @@ static void mptcp_close(struct sock *sk, long timeout)
lock_sock(sk);
mptcp_token_destroy(msk->token);
inet_sk_state_store(sk, TCP_CLOSE);
__mptcp_flush_join_list(msk);
/* be sure to always acquire the join list lock, to sync vs
* mptcp_finish_join().
*/
spin_lock_bh(&msk->join_list_lock);
list_splice_tail_init(&msk->join_list, &msk->conn_list);
spin_unlock_bh(&msk->join_list_lock);
list_splice_init(&msk->conn_list, &conn_list);
data_fin_tx_seq = msk->write_seq;
@ -1457,6 +1460,7 @@ static void mptcp_destroy(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
mptcp_token_destroy(msk->token);
if (msk->cached_ext)
__skb_ext_put(msk->cached_ext);
@ -1623,22 +1627,30 @@ bool mptcp_finish_join(struct sock *sk)
if (!msk->pm.server_side)
return true;
/* passive connection, attach to msk socket */
if (!mptcp_pm_allow_new_subflow(msk))
return false;
/* active connections are already on conn_list, and we can't acquire
* msk lock here.
* use the join list lock as synchronization point and double-check
* msk status to avoid racing with mptcp_close()
*/
spin_lock_bh(&msk->join_list_lock);
ret = inet_sk_state_load(parent) == TCP_ESTABLISHED;
if (ret && !WARN_ON_ONCE(!list_empty(&subflow->node)))
list_add_tail(&subflow->node, &msk->join_list);
spin_unlock_bh(&msk->join_list_lock);
if (!ret)
return false;
/* attach to msk socket only after we are sure he will deal with us
* at close time
*/
parent_sock = READ_ONCE(parent->sk_socket);
if (parent_sock && !sk->sk_socket)
mptcp_sock_graft(sk, parent_sock);
ret = mptcp_pm_allow_new_subflow(msk);
if (ret) {
subflow->map_seq = msk->ack_seq;
/* active connections are already on conn_list */
spin_lock_bh(&msk->join_list_lock);
if (!WARN_ON_ONCE(!list_empty(&subflow->node)))
list_add_tail(&subflow->node, &msk->join_list);
spin_unlock_bh(&msk->join_list_lock);
}
return ret;
subflow->map_seq = msk->ack_seq;
return true;
}
bool mptcp_sk_is_subflow(const struct sock *sk)
@ -1712,6 +1724,14 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
int err;
lock_sock(sock->sk);
if (sock->state != SS_UNCONNECTED && msk->subflow) {
/* pending connection or invalid state, let existing subflow
* cope with that
*/
ssock = msk->subflow;
goto do_connect;
}
ssock = __mptcp_socket_create(msk, TCP_SYN_SENT);
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
@ -1726,9 +1746,17 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
mptcp_subflow_ctx(ssock->sk)->request_mptcp = 0;
#endif
do_connect:
err = ssock->ops->connect(ssock, uaddr, addr_len, flags);
inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk));
mptcp_copy_inaddrs(sock->sk, ssock->sk);
sock->state = ssock->state;
/* on successful connect, the msk state will be moved to established by
* subflow_finish_connect()
*/
if (!err || err == EINPROGRESS)
mptcp_copy_inaddrs(sock->sk, ssock->sk);
else
inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk));
unlock:
release_sock(sock->sk);