On Tuesday 09 December 2008 09:12:59 ext Yang Hongyang, you wrote:
quoted text
> 1.When no interface is specified in an IPV6_PKTINFO ancillary data
>   item, the interface specified in an IPV6_PKTINFO sticky optionis
>   is used.

quoted text
> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> index 8b48512..addd856 100644
> --- a/net/ipv6/udp.c
> +++ b/net/ipv6/udp.c
> @@ -761,6 +761,9 @@ do_udp_sendmsg:
>  	}
>
>  	if (!fl.oif)
> +		fl.oif = np->sticky_pktinfo.ipi6_ifindex;
> +
> +	if (!fl.oif)
>  		fl.oif = sk->sk_bound_dev_if;
>
>  	if (msg->msg_controllen) {

I believe overriding the outgoing interface is only allowed for link-local 
destinations, _or_ with privileges (as with SO_BINDTODEVICE).

This patch seems to change this, and I am not convinced it's a good idea.

-- 
Rémi Denis-Courmont
Maemo Software, Nokia Devices R&D
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