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| author | Paolo Abeni <pabeni@redhat.com> | 2020-10-09 20:00:01 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-10-10 21:04:53 +0300 |
| commit | 0e4f35d7880157ceccf0a58377d778b02762af82 (patch) | |
| tree | 6160e37cd56d5a28940c4e18f00eade5f9489fc0 /net/mptcp/protocol.c | |
| parent | d582484726c4c46c8580923e855665fb91e3463e (diff) | |
| download | linux-0e4f35d7880157ceccf0a58377d778b02762af82.tar.xz | |
mptcp: subflows garbage collection
The msk can close MP_JOIN subflows if the initial handshake
fails. Currently such subflows are kept alive in the
conn_list until the msk itself is closed.
Beyond the wasted memory, we could end-up sending the
DATA_FIN and the DATA_FIN ack on such socket, even after a
reset.
Fixes: 43b54c6ee382 ("mptcp: Use full MPTCP-level disconnect state machine")
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp/protocol.c')
| -rw-r--r-- | net/mptcp/protocol.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 5d747c6a610e..b295eb6e9580 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1383,6 +1383,20 @@ static void pm_work(struct mptcp_sock *msk) spin_unlock_bh(&msk->pm.lock); } +static void __mptcp_close_subflow(struct mptcp_sock *msk) +{ + struct mptcp_subflow_context *subflow, *tmp; + + list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { + struct sock *ssk = mptcp_subflow_tcp_sock(subflow); + + if (inet_sk_state_load(ssk) != TCP_CLOSE) + continue; + + __mptcp_close_ssk((struct sock *)msk, ssk, subflow, 0); + } +} + static void mptcp_worker(struct work_struct *work) { struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work); @@ -1400,6 +1414,9 @@ static void mptcp_worker(struct work_struct *work) mptcp_clean_una(sk); mptcp_check_data_fin_ack(sk); __mptcp_flush_join_list(msk); + if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) + __mptcp_close_subflow(msk); + __mptcp_move_skbs(msk); if (msk->pm.status) |