diff options
| author | Mat Martineau <mathew.j.martineau@linux.intel.com> | 2020-07-28 15:12:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-28 17:02:42 -0700 |
| commit | 6920b851584cc69a61ebf2cff3948bb153bcef20 (patch) | |
| tree | ae5d803a7d22355c6b674873b8e2d747aba956bd | |
| parent | 3721b9b64676b3377a966f3d96acafd70bb32dd9 (diff) | |
mptcp: Add mptcp_close_state() helper
This will be used to transition to the appropriate state on close and
determine if a DATA_FIN needs to be sent for that state transition.
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/mptcp/protocol.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index e1c71bfd61a3..51370b69e30b 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1498,6 +1498,33 @@ static void mptcp_subflow_shutdown(struct sock *ssk, int how) release_sock(ssk); } +static const unsigned char new_state[16] = { + /* current state: new state: action: */ + [0 /* (Invalid) */] = TCP_CLOSE, + [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, + [TCP_SYN_SENT] = TCP_CLOSE, + [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, + [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, + [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, + [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */ + [TCP_CLOSE] = TCP_CLOSE, + [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, + [TCP_LAST_ACK] = TCP_LAST_ACK, + [TCP_LISTEN] = TCP_CLOSE, + [TCP_CLOSING] = TCP_CLOSING, + [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ +}; + +static int mptcp_close_state(struct sock *sk) +{ + int next = (int)new_state[sk->sk_state]; + int ns = next & TCP_STATE_MASK; + + inet_sk_state_store(sk, ns); + + return next & TCP_ACTION_FIN; +} + static void mptcp_close(struct sock *sk, long timeout) { struct mptcp_subflow_context *subflow, *tmp; |