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mptcp: create first subflow at msk creation time 

This cleans the code a bit and makes the behavior more consistent.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-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 2020-06-29 22:26:23 +02:00 committed by David S. Miller
parent d2f77c5334
commit fa68018dc4
1 changed files with 20 additions and 33 deletions
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53
net/mptcp/protocol.c
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@ -86,32 +86,16 @@ static struct socket *__mptcp_tcp_fallback(struct mptcp_sock *msk)
return msk->subflow;
}
static bool __mptcp_can_create_subflow(const struct mptcp_sock *msk)
{
return !msk->first;
}
static struct socket *__mptcp_socket_create(struct mptcp_sock *msk, int state)
static int __mptcp_socket_create(struct mptcp_sock *msk)
{
struct mptcp_subflow_context *subflow;
struct sock *sk = (struct sock *)msk;
struct socket *ssock;
int err;
ssock = __mptcp_tcp_fallback(msk);
if (unlikely(ssock))
return ssock;
ssock = __mptcp_nmpc_socket(msk);
if (ssock)
goto set_state;
if (!__mptcp_can_create_subflow(msk))
return ERR_PTR(-EINVAL);
err = mptcp_subflow_create_socket(sk, &ssock);
if (err)
return ERR_PTR(err);
return err;
msk->first = ssock->sk;
msk->subflow = ssock;
@ -124,10 +108,7 @@ static struct socket *__mptcp_socket_create(struct mptcp_sock *msk, int state)
*/
RCU_INIT_POINTER(msk->first->sk_wq, &sk->sk_socket->wq);
set_state:
if (state != MPTCP_SAME_STATE)
inet_sk_state_store(sk, state);
return ssock;
return 0;
}
static void __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
@ -1255,6 +1236,10 @@ static int mptcp_init_sock(struct sock *sk)
if (ret)
return ret;
ret = __mptcp_socket_create(mptcp_sk(sk));
if (ret)
return ret;
sk_sockets_allocated_inc(sk);
sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[2];
@ -1744,9 +1729,9 @@ static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
int err;
lock_sock(sock->sk);
ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE);
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
err = -EINVAL;
goto unlock;
}
@ -1776,13 +1761,14 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
goto do_connect;
}
mptcp_token_destroy(msk);
ssock = __mptcp_socket_create(msk, TCP_SYN_SENT);
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
err = -EINVAL;
goto unlock;
}
mptcp_token_destroy(msk);
inet_sk_state_store(sock->sk, TCP_SYN_SENT);
subflow = mptcp_subflow_ctx(ssock->sk);
#ifdef CONFIG_TCP_MD5SIG
/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
@ -1820,13 +1806,14 @@ static int mptcp_listen(struct socket *sock, int backlog)
pr_debug("msk=%p", msk);
lock_sock(sock->sk);
mptcp_token_destroy(msk);
ssock = __mptcp_socket_create(msk, TCP_LISTEN);
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
err = -EINVAL;
goto unlock;
}
mptcp_token_destroy(msk);
inet_sk_state_store(sock->sk, TCP_LISTEN);
sock_set_flag(sock->sk, SOCK_RCU_FREE);
err = ssock->ops->listen(ssock, backlog);