netdev - Re: [RFC net-next 1/2] net: allow user to set IPv6 nexthop for IPv4 route

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Date:	Thu, 26 Mar 2015 17:42:45 -0400
From:	Sowmini Varadhan <sowmini05@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Bjornar Ness <bjornar.ness@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [RFC net-next 1/2] net: allow user to set IPv6 nexthop for IPv4 route

On Thu, Mar 26, 2015 at 5:05 PM, Andy Gospodarek
<gospo@...ulusnetworks.com> wrote:

> +                       if (nla_len(nla) == 4) {
> +                               nexthop_nh->nh_gw = nla ? nla_get_be32(nla) : 0;
> +                       } else if (nla_len(nla) == 16) {
> +                               nla_memcpy(&nexthop_nh->nh_gw6, nla, nla_len(nla));
> +                       } else return -EINVAL;

would be better to use sizeof (in_addr_t) and sizeof (struct in6_addr)
for clarity? same applies for:


> +                       if (!ipv6_addr_any(&nh->nh_gw6) &&
> +                           nla_put(skb, RTA_GATEWAY, 16, &nh->nh_gw6))
> +                               goto nla_put_failure;


I havent read the MPBGP spec, but I'm also intrigued by how ND and NUD
will work in this model, since the packet that triggers each is not an
ipv6 packet.

--Sowmini
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