* [MPTCP] Re: [PATCH mptcp-net] mptcp: fix DATA_FIN generation on early shutdown.
@ 2021-02-15 15:29 Matthieu Baerts
0 siblings, 0 replies; 4+ messages in thread
From: Matthieu Baerts @ 2021-02-15 15:29 UTC (permalink / raw)
To: mptcp
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Hi Paolo, Mat,
On 11/02/2021 23:13, Paolo Abeni wrote:
> If the msk is closed before sending or receiving any data,
> no DATA_FIN is generated, instead an MPC ack packet is
> crafted out.
>
> In the above scenario, the MPTCP protocol create and send a
> pure ack and such packets matches also the criteria for an
> MPC ack and the protocol tries first to insert MPC options,
> leading the described error.
>
> This change address the issue skipping MPC option for DATA_FIN
> packets or if the subflow is not established.
>
> To avoid doing multiple times the same test, fetch the data_fin
> flag in a bool variable and pass it to both the interested
> helpers.
>
> Fixes: 6d0060f600ad ("mptcp: Write MPTCP DSS headers to outgoing data packets")
> Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
Thank you for the patch and the review!
> ---
> The scenario is tested by a specific pktdrill tested,
> already pushed
Thank you for that! (and for having use "mptcp-net" :) even if we can
change that if it is not OK).
I just applied your patch at the bottom of the tree, after a patch from
Florian (mptcp: reset last_snd on subflow close). With Mat's RvB tag and
without a dot at the end of the title:
- b7ee76d557c4: mptcp: fix DATA_FIN generation on early shutdown
- Results: 655ef2e493c8..82aaf8587e26
Tests + export are in progress!
Cheers,
Matt
--
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net
^ permalink raw reply [flat|nested] 4+ messages in thread
* [MPTCP] Re: [PATCH mptcp-net] mptcp: fix DATA_FIN generation on early shutdown.
@ 2021-02-15 19:10 Matthieu Baerts
0 siblings, 0 replies; 4+ messages in thread
From: Matthieu Baerts @ 2021-02-15 19:10 UTC (permalink / raw)
To: mptcp
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On 15/02/2021 16:29, Matthieu Baerts wrote:
>> The scenario is tested by a specific pktdrill tested,
>> already pushed
>
> Thank you for that! (and for having use "mptcp-net" :) even if we can
> change that if it is not OK).
> I just applied your patch at the bottom of the tree, after a patch from
> Florian (mptcp: reset last_snd on subflow close). With Mat's RvB tag and
> without a dot at the end of the title:
>
> - b7ee76d557c4: mptcp: fix DATA_FIN generation on early shutdown
> - Results: 655ef2e493c8..82aaf8587e26
I had to move it in our tree after "mptcp: better msk receive window
updates" which is not in net-next yet.
- 50ae59ab415b: mptcp: fix DATA_FIN generation on early shutdown
- Results: 82aaf8587e26..1de5e73fbb6c
Tests + export have been restarted. My CI is frequently hitting bug 160
-- it did here so I don't have all results -- but it is not as frequent
on my local environment.
Cheers,
Matt
--
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net
^ permalink raw reply [flat|nested] 4+ messages in thread
* [MPTCP] Re: [PATCH mptcp-net] mptcp: fix DATA_FIN generation on early shutdown.
@ 2021-02-15 9:44 Paolo Abeni
0 siblings, 0 replies; 4+ messages in thread
From: Paolo Abeni @ 2021-02-15 9:44 UTC (permalink / raw)
To: mptcp
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On Fri, 2021-02-12 at 17:06 -0800, Mat Martineau wrote:
> On Thu, 11 Feb 2021, Paolo Abeni wrote:
>
> > If the msk is closed before sending or receiving any data,
> > no DATA_FIN is generated, instead an MPC ack packet is
> > crafted out.
> >
> > In the above scenario, the MPTCP protocol create and send a
> > pure ack and such packets matches also the criteria for an
> > MPC ack and the protocol tries first to insert MPC options,
> > leading the described error.
> >
> > This change address the issue skipping MPC option for DATA_FIN
> > packets or if the subflow is not established.
> >
> > To avoid doing multiple times the same test, fetch the data_fin
> > flag in a bool variable and pass it to both the interested
> > helpers.
> >
> > Fixes: 6d0060f600ad ("mptcp: Write MPTCP DSS headers to outgoing data packets")
> > Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
> > ---
> > The scenario is tested by a specific pktdrill tested,
> > already pushed
> > ---
> > net/mptcp/options.c | 23 ++++++++++++++---------
> > 1 file changed, 14 insertions(+), 9 deletions(-)
>
> Hi Paolo -
>
> Change looks good to me:
>
> Reviewed-by: Mat Martineau <mathew.j.martineau(a)linux.intel.com>
Thanks!
> Were you intending this for the export branch or the -net tree? (Unsure
> due to the [PATCH mptcp-net] prefix)
I'm trying to follow the rules listed here:
https://annuel2.framapad.org/p/mptcp_upstreaming_20201126
(starting from line 188). 'mptcp-net' is targeting the -net tree after
being staged in the export branch.
Cheers,
Paolo
^ permalink raw reply [flat|nested] 4+ messages in thread
* [MPTCP] Re: [PATCH mptcp-net] mptcp: fix DATA_FIN generation on early shutdown.
@ 2021-02-13 1:06 Mat Martineau
0 siblings, 0 replies; 4+ messages in thread
From: Mat Martineau @ 2021-02-13 1:06 UTC (permalink / raw)
To: mptcp
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On Thu, 11 Feb 2021, Paolo Abeni wrote:
> If the msk is closed before sending or receiving any data,
> no DATA_FIN is generated, instead an MPC ack packet is
> crafted out.
>
> In the above scenario, the MPTCP protocol create and send a
> pure ack and such packets matches also the criteria for an
> MPC ack and the protocol tries first to insert MPC options,
> leading the described error.
>
> This change address the issue skipping MPC option for DATA_FIN
> packets or if the subflow is not established.
>
> To avoid doing multiple times the same test, fetch the data_fin
> flag in a bool variable and pass it to both the interested
> helpers.
>
> Fixes: 6d0060f600ad ("mptcp: Write MPTCP DSS headers to outgoing data packets")
> Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
> ---
> The scenario is tested by a specific pktdrill tested,
> already pushed
> ---
> net/mptcp/options.c | 23 ++++++++++++++---------
> 1 file changed, 14 insertions(+), 9 deletions(-)
Hi Paolo -
Change looks good to me:
Reviewed-by: Mat Martineau <mathew.j.martineau(a)linux.intel.com>
Were you intending this for the export branch or the -net tree? (Unsure
due to the [PATCH mptcp-net] prefix)
Thanks,
Mat
>
> diff --git a/net/mptcp/options.c b/net/mptcp/options.c
> index b63574d6b812e..444a38681e93e 100644
> --- a/net/mptcp/options.c
> +++ b/net/mptcp/options.c
> @@ -411,6 +411,7 @@ static void clear_3rdack_retransmission(struct sock *sk)
> }
>
> static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
> + bool snd_data_fin_enable,
> unsigned int *size,
> unsigned int remaining,
> struct mptcp_out_options *opts)
> @@ -428,9 +429,10 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
> if (!skb)
> return false;
>
> - /* MPC/MPJ needed only on 3rd ack packet */
> - if (subflow->fully_established ||
> - subflow->snd_isn != TCP_SKB_CB(skb)->seq)
> + /* MPC/MPJ needed only on 3rd ack packet, DATA_FIN and TCP shutdown take precedence */
> + if (subflow->fully_established || snd_data_fin_enable ||
> + subflow->snd_isn != TCP_SKB_CB(skb)->seq ||
> + sk->sk_state != TCP_ESTABLISHED)
> return false;
>
> if (subflow->mp_capable) {
> @@ -502,20 +504,20 @@ static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,
> }
>
> static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
> + bool snd_data_fin_enable,
> unsigned int *size,
> unsigned int remaining,
> struct mptcp_out_options *opts)
> {
> struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
> struct mptcp_sock *msk = mptcp_sk(subflow->conn);
> - u64 snd_data_fin_enable, ack_seq;
> unsigned int dss_size = 0;
> struct mptcp_ext *mpext;
> unsigned int ack_size;
> bool ret = false;
> + u64 ack_seq;
>
> mpext = skb ? mptcp_get_ext(skb) : NULL;
> - snd_data_fin_enable = mptcp_data_fin_enabled(msk);
>
> if (!skb || (mpext && mpext->use_map) || snd_data_fin_enable) {
> unsigned int map_size;
> @@ -717,12 +719,15 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
> unsigned int *size, unsigned int remaining,
> struct mptcp_out_options *opts)
> {
> + struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
> + struct mptcp_sock *msk = mptcp_sk(subflow->conn);
> unsigned int opt_size = 0;
> + bool snd_data_fin;
> bool ret = false;
>
> opts->suboptions = 0;
>
> - if (unlikely(mptcp_check_fallback(sk)))
> + if (unlikely(__mptcp_check_fallback(msk)))
> return false;
>
> /* prevent adding of any MPTCP related options on reset packet
> @@ -731,10 +736,10 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
> if (unlikely(skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST))
> return false;
>
> - if (mptcp_established_options_mp(sk, skb, &opt_size, remaining, opts))
> + snd_data_fin = mptcp_data_fin_enabled(msk);
> + if (mptcp_established_options_mp(sk, skb, snd_data_fin, &opt_size, remaining, opts))
> ret = true;
> - else if (mptcp_established_options_dss(sk, skb, &opt_size, remaining,
> - opts))
> + else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts))
> ret = true;
>
> /* we reserved enough space for the above options, and exceeding the
> --
> 2.26.2
> _______________________________________________
> mptcp mailing list -- mptcp(a)lists.01.org
> To unsubscribe send an email to mptcp-leave(a)lists.01.org
>
--
Mat Martineau
Intel
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2021-02-15 19:10 Matthieu Baerts
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