Re: [RFC] cfg80211/mac80211: Add support for Proxy ARP

[Ben Greear <greearb@candelatech.com>]

On 05/15/2014 12:06 PM, Kyeyoon Park wrote:
> Proxy ARP allows the AP devices to keep track of the hardware address
> to IP address mapping of the STA devices within the BSS. When a request
> for such information is made (i.e. ARP request, Neighbor Solicitation),
> the AP will respond on behalf of the STA device within the BSS. Such
> requests could originate from a device within the BSS or also from the
> bridge. In the process of the AP replying to the request (i.e. ARP
> reply, Neighbor Advertisement), the AP will drop the original request
> frame. The relevant STA will not even know that such information was
> ever requested.
> 
> This feature is a requirement for Hotspot 2.0. This feature is defined
> in IEEE Std 802.11-2012, 10.23.13. This particular commit will
> eventually be split into two separate commits (cfg80211 and mac80211
> separately). This commit implements one part of the feature, dynamic
> IPv4 addresses and ARP. Additional commits will be made to support
> static IPv4 addresses and IPv6.
> 
> Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>

> +#define STA_IPV4_HASH_SIZE 32
> +#define STA_IPV4_HASH(ipv4) (((u8 *)&ipv4)[3] & 0x1F)

This should be a better hash I think.  Use an existing hash
method or at least mix in the higher bits manually?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com