The SRv6 technology with ostinato

[粘英璞]

Hello ！

Recently I have been researching how to make SRv6 packets with ostinato. Does the author or anyone else have any ideas? for example How do I add SRv6 extension headers ？ etc.

[Srivats P]

You need to use Ostinato userscript for SRv6.

Create the following protocol stack - 

Mac, Eth, IPv6, Userscript, UDP, Pattern

and use the following SRv6 userscript -

const sids = [

0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e1f,

0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e2f,

0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e4f,

0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e4f,

0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e5f

];

protocol.name = "SRv6 SRH"

protocol.protocolFrameSize = function() { return 8 + sids.length*4; }

protocol.protocolId = function(id_type)

{

if (id_type == Protocol.ProtocolIdIp)

return 43;

return 0;

}

protocol.protocolFrameValue = function(index)

{

var segmentsLeft = sids.length/4-1;

var tag = 0xabcd;

var pfv = new Array(protocol.protocolFrameSize());

// next header (8)

pfv[0] = protocol.payloadProtocolId(Protocol.ProtocolIdIp);

// hdr ext len (8)

pfv[1] = sids.length/2; // 2 quad-words per SID

// routing type (8)

pfv[2] = 4;

// segments left (8)

pfv[3] = segmentsLeft;

// last entry (8)

pfv[4] = sids.length/4-1;

// flags (8)

pfv[5] = 0;

// Tag (16)

pfv[6] = (tag >> 8) & 0xFF;

pfv[7] = (tag >> 0) & 0xFF;

// SIDs

for (i = 0; i < sids.length; i++) {

pfv[8+i*4+0] = (sids[i] >> 24) & 0xFF;

pfv[8+i*4+1] = (sids[i] >> 16) & 0xFF;

pfv[8+i*4+2] = (sids[i] >> 8) & 0xFF;

pfv[8+i*4+3] = (sids[i] >> 0) & 0xFF;

}

return pfv;

}

On Wed, May 10, 2023 at 5:23 PM 粘英璞 <niany...@gmail.com> wrote:

Hello ！

Recently I have been researching how to make SRv6 packets with ostinato. Does the author or anyone else have any ideas? for example How do I add SRv6 extension headers ？ etc.

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[Marc]

Can you teach me step by step how to create the userscript for SRv6? Im trying to send a traffic TCP in a SRv6 explicit path policy. Thanks

[Srivats P]

You can consult the documentation - https://userguide.ostinato.org/user-script/

Srivats (Founder, Ostinato)

PS - Please note that Ostinato is stateless and hence TCP won't be supported.

To view this discussion on the web visit https://groups.google.com/d/msgid/ostinato/72140bc0-f607-4799-9020-635dc5ce6721n%40googlegroups.com.