how ipv6 support multicast routing

how ipv6 support multicast routing

[Zheng Jianping]

Hi,

We are developing IPv6 multicast routing protocol --PIM-SM. To support IPv6 multicast packet forwarding, Linux kernel need to be modified.  I am coding the file 'ip6_mroute.c' which is  derived from 'ipmr.c' in ipv4.
 
My question is how to modify the IPv6 code in the kernl to make 'ip6_mroute.c' works, i.e how to modify the files such as 'ip6/ip6_ouput.c', 'ip6/route.c' , etc.

I try to refrence to IPv4 code but it seems that the routing mechanism of IPv6 is something different from IPv4. So I get confused.

Could you give me some suggestion?

Thanks in advance!

Best Regards,
Zheng 



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Re: how ipv6 support multicast routing

[Pekka Savola]

On Thu, 7 Nov 2002, Zheng Jianping wrote:
> We are developing IPv6 multicast routing protocol --PIM-SM. To support IPv6 multicast packet forwarding, Linux kernel need to be modified.  I am coding the file 'ip6_mroute.c' which is  derived from 'ipmr.c' in ipv4.
>  
> My question is how to modify the IPv6 code in the kernl to make 'ip6_mroute.c' works, i.e how to modify the files such as 'ip6/ip6_ouput.c', 'ip6/route.c' , etc.
> 
> I try to refrence to IPv4 code but it seems that the routing mechanism of IPv6 is something different from IPv4. So I get confused.

have you looked at ip6_input.c/ip6_output.c already?  There's an 
(obsolete) ip6_mc_input function there, perhaps it might get you started.  
I recall usagi have made some minor modifications to it too, but I doubt 
it works.

(I'd like to see PIM-SM work myself too.)

-- 
Pekka Savola                 "Tell me of difficulties surmounted,
Netcore Oy                   not those you stumble over and fall"
Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords

Re: how ipv6 support multicast routing

[Zheng Jianping]

----- Original Message -----
From: "Pekka Savola" <pekkas@netcore.fi>
To: "Zheng Jianping" <zjp@iscas.ac.cn>
Cc: <netdev@oss.sgi.com>
Sent: Thursday, November 07, 2002 2:45 PM
Subject: Re: how ipv6 support multicast routing



> have you looked at ip6_input.c/ip6_output.c already?  There's an
> (obsolete) ip6_mc_input function there, perhaps it might get you started.
> I recall usagi have made some minor modifications to it too, but I doubt
> it works.

Yes, I've looked at these files and did find ip6_mc_input function.
I add the following code to ip6_mc_input

#ifdef (CONFIG_IP6_MROUTE)
  int addr_type;
  addr_type = ipv6_addr_type(&hdr->daddr);
  if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
   ip6_mr_input(skb);  /*defined in my 'ip6_mroute.c'*/
  }
#endif

But I don't knwo how to modify the functions in net/ip6/route.c, such as
ip6_route_input
ip6_route_output

and the funciton in net/ip6/ip6_output.c
ip6_output


> (I'd like to see PIM-SM work myself too.)
Is there somebody else doing the work of IPv6 multicast forwarding in Linux?

Thanks,
Zheng