From: Michael Tuexen <tuexen@fh-muenster.de>
To: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Xin Long <lucien.xin@gmail.com>,
network dev <netdev@vger.kernel.org>,
linux-sctp@vger.kernel.org, Neil Horman <nhorman@tuxdriver.com>,
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 23:15:26 +0200 [thread overview]
Message-ID: <3BC2D946-9EA7-4847-9C6E-B3C9DA6A6618@fh-muenster.de> (raw)
Message-ID: <20201020211526.1ZC4ostBlhLSWLusUVdeWayGHv4S8y5AH_sUr2q1LMk@z> (raw)
In-Reply-To: <20201020211108.GF11030@localhost.localdomain>
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> On 20. Oct 2020, at 23:11, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> wrote:
>
> 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?
No. The default is 0, which means that the encapsulation is turned off.
Setting this sysctl variable to a non-zero value enables the UDP tunneling
with the given port.
Best regards
Michael
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next prev parent reply other threads:[~2020-10-20 21:15 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
2020-10-20 21:11 ` Marcelo Ricardo Leitner
2020-10-20 21:15 ` Michael Tuexen [this message]
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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