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mptcp: subflow: check parent mptcp socket on subflow state change

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This is needed at least until proper MPTCP-Level fin/reset
signalling gets added:

We wake parent when a subflow changes, but we should do this only
when all subflows have closed, not just one.

Schedule the mptcp worker and tell it to check eof state on all
subflows.

Only flag mptcp socket as closed and wake userspace processes blocking
in poll if all subflows have closed.

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2020-04-02 13:44:52 +02:00 committed by David S. Miller
parent 0b4f33def7
commit 59832e2465
3 changed files with 36 additions and 2 deletions
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33
net/mptcp/protocol.c
View File

@ -327,6 +327,15 @@ void mptcp_data_acked(struct sock *sk)
sock_hold(sk);
}
void mptcp_subflow_eof(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
if (!test_and_set_bit(MPTCP_WORK_EOF, &msk->flags) &&
schedule_work(&msk->work))
sock_hold(sk);
}
static void mptcp_stop_timer(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
@ -1031,6 +1040,27 @@ static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu)
return 0;
}
static void mptcp_check_for_eof(struct mptcp_sock *msk)
{
struct mptcp_subflow_context *subflow;
struct sock *sk = (struct sock *)msk;
int receivers = 0;
mptcp_for_each_subflow(msk, subflow)
receivers += !subflow->rx_eof;
if (!receivers && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
/* hopefully temporary hack: propagate shutdown status
* to msk, when all subflows agree on it
*/
sk->sk_shutdown |= RCV_SHUTDOWN;
smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
set_bit(MPTCP_DATA_READY, &msk->flags);
sk->sk_data_ready(sk);
}
}
static void mptcp_worker(struct work_struct *work)
{
struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work);
@ -1047,6 +1077,9 @@ static void mptcp_worker(struct work_struct *work)
__mptcp_flush_join_list(msk);
__mptcp_move_skbs(msk);
if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags))
mptcp_check_for_eof(msk);
if (!test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags))
goto unlock;

2
net/mptcp/protocol.h
View File

@ -89,6 +89,7 @@
#define MPTCP_DATA_READY 0
#define MPTCP_SEND_SPACE 1
#define MPTCP_WORK_RTX 2
#define MPTCP_WORK_EOF 3
static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
{
@ -339,6 +340,7 @@ void mptcp_finish_connect(struct sock *sk);
void mptcp_data_ready(struct sock *sk, struct sock *ssk);
bool mptcp_finish_join(struct sock *sk);
void mptcp_data_acked(struct sock *sk);
void mptcp_subflow_eof(struct sock *sk);
int mptcp_token_new_request(struct request_sock *req);
void mptcp_token_destroy_request(u32 token);

3
net/mptcp/subflow.c
View File

@ -994,8 +994,7 @@ static void subflow_state_change(struct sock *sk)
if (!(parent->sk_shutdown & RCV_SHUTDOWN) &&
!subflow->rx_eof && subflow_is_done(sk)) {
subflow->rx_eof = 1;
parent->sk_shutdown |= RCV_SHUTDOWN;
__subflow_state_change(parent);
mptcp_subflow_eof(parent);
}
}