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Date:   Wed, 13 May 2020 10:07:18 -0700
From:   Christoph Paasch <cpaasch@...le.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 0/3] mptcp: fix MP_JOIN failure handling

On 13/05/20 - 17:31:01, Paolo Abeni wrote:
> Currently if we hit an MP_JOIN failure on the third ack, the child socket is
> closed with reset, but the request socket is not deleted, causing weird
> behaviors.
> 
> The main problem is that MPTCP's MP_JOIN code needs to plug it's own
> 'valid 3rd ack' checks and the current TCP callbacks do not allow that.
> 
> This series tries to address the above shortcoming introducing a new MPTCP
> specific bit in a 'struct tcp_request_sock' hole, and leveraging that to allow
> tcp_check_req releasing the request socket when needed.
> 
> The above allows cleaning-up a bit current MPTCP hooking in tcp_check_req().
> 
> An alternative solution, possibly cleaner but more invasive, would be
> changing the 'bool *own_req' syn_recv_sock() argument into 'int *req_status'
> and let MPTCP set it to 'REQ_DROP'.
> 
> RFC -> v1:
>  - move the drop_req bit inside tcp_request_sock (Eric)
> 
> Paolo Abeni (3):
>   mptcp: add new sock flag to deal with join subflows
>   inet_connection_sock: factor out destroy helper.
>   mptcp: cope better with MP_JOIN failure
> 
>  include/linux/tcp.h                |  3 +++
>  include/net/inet_connection_sock.h |  8 ++++++++
>  include/net/mptcp.h                | 17 ++++++++++-------
>  net/ipv4/inet_connection_sock.c    |  6 +-----
>  net/ipv4/tcp_minisocks.c           |  2 +-
>  net/mptcp/protocol.c               |  7 -------
>  net/mptcp/subflow.c                | 17 +++++++++++------
>  7 files changed, 34 insertions(+), 26 deletions(-)

Reviewed-by: Christoph Paasch <cpaasch@...le.com>



Christoph

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