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From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
To: Xin Long <lucien.xin@gmail.com>
Cc: network dev <netdev@vger.kernel.org>,
	linux-sctp@vger.kernel.org, Neil Horman <nhorman@tuxdriver.com>,
	Michael Tuexen <tuexen@fh-muenster.de>,
	davem <davem@davemloft.net>, Guillaume Nault <gnault@redhat.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Subject: Re: [PATCHv4 net-next 16/16] sctp: enable udp tunneling socks
Date: Tue, 20 Oct 2020 18:11:08 -0300	[thread overview]
Message-ID: <20201020211108.GF11030@localhost.localdomain> (raw)
Message-ID: <20201020211108.rh0o3fslfN4sP8iSDCvAswLTg__r-XbQgZ6KS8daG1Y@z> (raw)
In-Reply-To: <CADvbK_ezWXMxpKkt3kxbXhcgu73PTJ1zpChb_sCgDu38xcROtA@mail.gmail.com>

On Tue, Oct 20, 2020 at 05:12:06PM +0800, Xin Long wrote:
> On Tue, Oct 20, 2020 at 6:15 AM Marcelo Ricardo Leitner
> <marcelo.leitner@gmail.com> wrote:
> >
> > On Mon, Oct 19, 2020 at 08:25:33PM +0800, Xin Long wrote:
> > > --- a/Documentation/networking/ip-sysctl.rst
> > > +++ b/Documentation/networking/ip-sysctl.rst
> > > @@ -2640,6 +2640,12 @@ addr_scope_policy - INTEGER
> > >
> > >       Default: 1
> > >
> > > +udp_port - INTEGER
> >
> > Need to be more verbose here, and also mention the RFC.
> >
> > > +     The listening port for the local UDP tunneling sock.
> >         , shared by all applications in the same net namespace.
> > > +     UDP encapsulation will be disabled when it's set to 0.
> >
> >         "Note, however, that setting just this is not enough to actually
> >         use it. ..."
> When it's a client, yes,  but when it's a server, the encap_port can
> be got from the incoming packet.
> 
> >
> > > +
> > > +     Default: 9899
> > > +
> > >  encap_port - INTEGER
> > >       The default remote UDP encapsalution port.
> > >       When UDP tunneling is enabled, this global value is used to set
> >
> > When is it enabled, which conditions are needed? Maybe it can be
> > explained only in the one above.
> Thanks!
> pls check if this one will be better:

It is. Verbose enough now, thx.
(one other comment below)

> 
> udp_port - INTEGER
> 
> The listening port for the local UDP tunneling sock.
> 
> This UDP sock is used for processing the incoming UDP-encapsulated
> SCTP packets (from RFC6951), and shared by all applications in the
> same net namespace. This UDP sock will be closed when the value is
> set to 0.
> 
> The value will also be used to set the src port of the UDP header
> for the outgoing UDP-encapsulated SCTP packets. For the dest port,
> please refer to 'encap_port' below.
> 
> Default: 9899

I'm now wondering if this is the right default. I mean, it is the
standard port for it, yes, but at the same time, it means loading SCTP
module will steal/use that UDP port on all net namespaces and can lead
to conflicts with other apps. A more conservative approach here is to
document the standard port, but set the default to 0 and require the
user to set it in if it is expected to be used.

Did FreeBSD enable it by default too?

  parent reply	other threads:[~2020-10-20 21:11 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-19 12:25 [PATCHv4 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Xin Long
2020-10-19 12:25 ` Xin Long
2020-10-19 12:25 ` [PATCHv4 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err Xin Long
2020-10-19 12:25   ` Xin Long
2020-10-19 12:25   ` [PATCHv4 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Xin Long
2020-10-19 12:25     ` Xin Long
2020-10-19 12:25     ` [PATCHv4 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Xin Long
2020-10-19 12:25       ` Xin Long
2020-10-19 12:25       ` [PATCHv4 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Xin Long
2020-10-19 12:25         ` Xin Long
2020-10-19 12:25         ` [PATCHv4 net-next 05/16] sctp: create udp6 sock and set " Xin Long
2020-10-19 12:25           ` Xin Long
2020-10-19 12:25           ` [PATCHv4 net-next 06/16] sctp: add encap_err_lookup for udp encap socks Xin Long
2020-10-19 12:25             ` Xin Long
2020-10-19 12:25             ` [PATCHv4 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Xin Long
2020-10-19 12:25               ` Xin Long
2020-10-19 12:25               ` [PATCHv4 net-next 08/16] sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt Xin Long
2020-10-19 12:25                 ` Xin Long
2020-10-19 12:25                 ` [PATCHv4 net-next 09/16] sctp: allow changing transport encap_port by peer packets Xin Long
2020-10-19 12:25                   ` Xin Long
2020-10-19 12:25                   ` [PATCHv4 net-next 10/16] sctp: add udphdr to overhead when udp_port is set Xin Long
2020-10-19 12:25                     ` Xin Long
2020-10-19 12:25                     ` [PATCHv4 net-next 11/16] sctp: call sk_setup_caps in sctp_packet_transmit instead Xin Long
2020-10-19 12:25                       ` Xin Long
2020-10-19 12:25                       ` [PATCHv4 net-next 12/16] sctp: support for sending packet over udp4 sock Xin Long
2020-10-19 12:25                         ` Xin Long
2020-10-19 12:25                         ` [PATCHv4 net-next 13/16] sctp: support for sending packet over udp6 sock Xin Long
2020-10-19 12:25                           ` Xin Long
2020-10-19 12:25                           ` [PATCHv4 net-next 14/16] sctp: add the error cause for new encapsulation port restart Xin Long
2020-10-19 12:25                             ` Xin Long
2020-10-19 12:25                             ` [PATCHv4 net-next 15/16] sctp: handle the init chunk matching an existing asoc Xin Long
2020-10-19 12:25                               ` Xin Long
2020-10-19 12:25                               ` [PATCHv4 net-next 16/16] sctp: enable udp tunneling socks Xin Long
2020-10-19 12:25                                 ` Xin Long
2020-10-19 22:15                                 ` Marcelo Ricardo Leitner
2020-10-19 22:15                                   ` Marcelo Ricardo Leitner
2020-10-19 22:29                                   ` Marcelo Ricardo Leitner
2020-10-19 22:29                                     ` Marcelo Ricardo Leitner
2020-10-20  9:12                                   ` Xin Long
2020-10-20  9:12                                     ` Xin Long
2020-10-20 21:11                                     ` Marcelo Ricardo Leitner [this message]
2020-10-20 21:11                                       ` Marcelo Ricardo Leitner
2020-10-20 21:15                                       ` Michael Tuexen
2020-10-20 21:15                                         ` Michael Tuexen
2020-10-20 21:23                                         ` Marcelo Ricardo Leitner
2020-10-20 21:23                                           ` Marcelo Ricardo Leitner
2020-10-20 22:08                                           ` David Laight
2020-10-20 22:13                                             ` 'Marcelo Ricardo Leitner'
2020-10-20 22:13                                               ` 'Marcelo Ricardo Leitner'
2020-10-21  4:16                                           ` Xin Long
2020-10-21  9:13                                             ` Michael Tuexen
2020-10-22  3:12                                               ` Xin Long
2020-10-22  8:47                                                 ` David Laight
2020-10-26  5:58                                                   ` Xin Long
2020-10-22 11:38                                                 ` Michael Tuexen
2020-10-19 22:14               ` [PATCHv4 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Marcelo Ricardo Leitner
2020-10-19 22:14                 ` Marcelo Ricardo Leitner

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