(usagi-users 00878) Re: Router Altert problem for RSVP on LinuxIPv6

[Charles Qi Shen <shenqi@xxxxxxxxxxxxxx>]

Hi,  Javier:

Sorry if I did not make it clear in the previous post.

The problem for the basic ROUTER_ALERT flag is that, if you initiate a 
socket with:

fd = socket (AF_INET6, SOCK_RAW, IPPROTO_RSVP)

setsocketopt(fd, IPPROTO_IPV6, IPV6_ROUTER_ALERT, (char *) &on, sizeof(on))

will return -1. The only occasion that setsocketopt for IPV6_ROUTER_ALERT 
can pass is when you supply the third parameter in socket function with 
IPPROTO_RAW.

If you look at net/ipv6/ipv6_sockglue.c, it says:

/* RA packet may be delivered ONLY to IPPROTO_RAW socket */

if (sk->type != SOCK_RAW || sk->num != IPPROTO_RAW)
		return -EINVAL;

Hope it is clearer.

Thanks and regards,

Charles

> Original message:

I'm not sure I understood you.      The problem is how to capture the 
packets?? If so, you have to set
a flag with the setsockopt function. The flag is ROUTER_ALERT. And if
you want to forward the packet, you only have to send it by means of
the write, send, etc. functions.      I hope this information might help 
you. If not, tell me exactly
what the problem is.                               Regards.       Javier 
Fernández Galván ----- Mensaje Original -----
De: Charles Qi Shen <shenqi@xxxxxxxxxxxxxx>
Fecha: Viernes, Octubre 12, 2001 10:10 am
Asunto: (usagi-users 00863) Router Altert problem for RSVP on Linux IPv6 > Hi,
>
> We are testing RSVP (ISI rsvpd.rel4.2a4-1.tar.gz) on Linux IPv6
> (Redhat
> 7.1, kernel version 2.4.9, or USAGI Sept. 03 2001 release). We
> managed to
> generate Path message with IPv6 Router Alert for RSVP Hop-by-hop
> options
> header according to RFC  2711.
>
> Does anyone know how to make the Linux router capture this RSVP
> message
> based on this option header and direct it to RSVP daemon ?
>
> Any information is greatly appreciated.
>
> Best regards.
>
> Charles
>
>  ___________________________________________________________________
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