netdev - ip6 route output() and ip_route_output

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Message-ID: <750794.80583.qm@web30108.mail.mud.yahoo.com>
Date:	Wed, 30 Jun 2010 00:24:04 -0700 (PDT)
From:	Parav Pandit <paravpandit@...oo.com>
To:	netdev@...r.kernel.org
Subject: ip6 route output() and ip_route_output_key() by drivers

Hi,

Our device driver uses ip6 route output() and typecast the return value of dst_entry to rt6_info (similar to (net/ip6/icmp.c)

Driver uses (a) rt6i_dst.addr, (b) rt6i_dst.plen and (c) rt6i_gateway to get the route entry (ip/mask, gw, netdev).

Can anyone please confirm that drivers and/or netfilter kernel modules are allowed to use them? netdev drivers like : cnic.c, cxgb3, nes are using the ipv4 API (but not IPv6 API).

Also ip_route_output_key() rtable and dst_entry doesn't seem to provide route entry's subnet mask/prefix value. how drivers/netfilter kernel module can get a ip/mask gateway value while given a destination IP address as input?

I really appreciate your inputs. I hope I am asking it on the relevant mailing list.

Regards,
Parav Pandit

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