netdev - Re: [Patch net-next v1 3/4] vxlan: add ipv6 support

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Date:	Mon, 1 Apr 2013 11:19:10 -0400
From:	David Stevens <dlstevens@...ibm.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	Cong Wang <amwang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [Patch net-next v1 3/4] vxlan: add ipv6 support

netdev-owner@...r.kernel.org wrote on 03/31/2013 01:43:44 AM:
 
> +struct vxlan_ip {
> +   union {
> +      __be32  ip4;
> +#if IS_ENABLED(CONFIG_IPV6)
> +      struct in6_addr ip6;
> +#endif
> +   };
> +   __be16          proto;
> +};
> +

        This looks suspiciously like a sockaddr. sockaddr_storage is
much bigger than you need, but you could just make it a sockaddr_in6
and cast it to sockaddr_in when needed, make it sockaddr_in6 and use
V4_MAPPED addresses for v4, or make it a union of sockaddr_in and
sockaddr_in6, or have a buffer the size of sockaddr_in6 and use it
as a sockaddr to determine the family, then go from there.
        I think anything along those lines is better than a new variant
with the same functionality of sockaddr that isn't an overlay of a
sockaddr.

                                                        +-DLS

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