[strongSwan] Question of get_use_time to trigger dpd from libcharon

[Venumadhav Josyula]

get_use_time -> get_usebytes, the implementation of it libcharon is as
shown below snippet.
1) if bytes, packets are both zero, is the below code correct ?
2) here if they { *bytes, *packets } are '0' for both not calling
update_usebytes in code below won't cause dpd to be triggered inspite of
traffic.
3) In our case following keep alive ping are being exhanges between peers.
thanks,
Regards
Venu

METHOD(child_sa_t, get_usestats, void,

676
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L676>

    private_child_sa_t *this, bool inbound,

677
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L677>

    time_t *time, uint64_t *bytes, uint64_t *packets)

678
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L678>

{

679
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L679>

    if ((!bytes && !packets) || update_usebytes(this, inbound) != FAILED)

680
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L680>

    {

681
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L681>

        /* there was traffic since last update or the kernel interface

682
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L682>

         * does not support querying the number of usebytes.

683
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L683>

         */

684
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L684>

        if (time)

685
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L685>

        {

686
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L686>

            if (!update_usetime(this, inbound) && !bytes && !packets)

687
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L687>

            {

688
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L688>

                /* if policy query did not yield a usetime, query SAs instead */

689
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L689>

                update_usebytes(this, inbound);

690
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L690>

            }

691
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L691>

        }

692
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L692>

    }

693
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L693>

    if (time)

694
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L694>

    {

695
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L695>

        *time = inbound ? this->my_usetime : this->other_usetime;

696
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L696>

    }

697
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L697>

    if (bytes)

698
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L698>

    {

699
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L699>

        *bytes = inbound ? this->my_usebytes : this->other_usebytes;

700
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L700>

    }

701
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L701>

    if (packets)

702
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L702>

    {

703
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L703>

        *packets = inbound ? this->my_usepackets : this->other_usepackets;

704
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L704>

    }

705
<https://wiki.strongswan.org/projects/strongswan/repository/revisions/master/entry/src/libcharon/sa/child_sa.c#L705>

}
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