Hi Jason,
According to IPv6(https://en.wikipedia.org/wiki/IPv6_packet) and IPv4
TOS(https://en.wikipedia.org/wiki/Type_of_service), Traffic class and
TOS seem have the same structure: the first six bits are DS field and
the last two bits for Explicit Congestion Notification.
Thanks!
Best Regards
Nan Xiao
On Tue, Sep 25, 2018 at 2:37 PM Jason McIntyre <j...@kerhand.co.uk> wrote:
>
> On Tue, Sep 25, 2018 at 09:11:42AM +0800, Nan Xiao wrote:
> > Hi tech@,
> >
>
> morning.
>
> > According to netcat source code, the `-T' option not only takes effect
> > in IPv4 but also IPv6:
> >
> > if (Tflag != -1) {
> > if (af == AF_INET && setsockopt(s, IPPROTO_IP,
> > IP_TOS, &Tflag, sizeof(Tflag)) == -1)
> > err(1, "set IP ToS");
> >
> > else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
> > IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
> > err(1, "set IPv6 traffic class");
> > }
> >
> > So I think the following patch should be more accurate:
> >
> > diff --git nc.1 nc.1
> > index cb391288f15..5588daf87ae 100644
> > --- nc.1
> > +++ nc.1
> > @@ -241,7 +241,7 @@ Cannot be used together with
> > or
> > .Fl x .
> > .It Fl T Ar keyword
> > -Change the IPv4 TOS value or the TLS options.
> > +Change the IPv4 TOS/IPv6 Traffic Class value or the TLS options.
> > .Pp
> > For TLS options,
> > .Ar keyword
> > @@ -269,7 +269,7 @@ for further details).
> > Specifying TLS options requires
> > .Fl c .
> > .Pp
> > -For the IPv4 TOS value,
> > +For the IPv4 TOS/IPv6 Traffic Class value,
> > .Ar keyword
> > may be one of
>
> one question: are the keywords identical for both v4 and 6?
>
> if so, anyone want to ok this?
> if not, the diff needs work.
>
> also, i think traffic class should be lower case.
>
> jmc
>
> > .Cm critical ,
> >
> >
> > Thanks!
> >
> > --
> > Best Regards
> > Nan Xiao
> >
>
