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AP: Add support for Proxy ARP, DHCP snooping mechanism

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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, and is defined in IEEE
Std 802.11-2012, 10.23.13. While the Proxy ARP support code mainly
resides in the kernel bridge code, in order to optimize the performance
and simplify kernel implementation, the DHCP snooping code was added to
the hostapd.

Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
This commit is contained in:
Kyeyoon Park 2014-09-25 22:32:55 -07:00 • committed by Jouni Malinen
parent 6897556455
commit 7d597d4617
12 changed files with 265 additions and 0 deletions
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30
src/ap/dhcp_snoop.h Normal file
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/*
* DHCP snooping for Proxy ARP
* Copyright (c) 2014, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifndef DHCP_SNOOP_H
#define DHCP_SNOOP_H
#ifdef CONFIG_PROXYARP
int dhcp_snoop_init(struct hostapd_data *hapd);
void dhcp_snoop_deinit(struct hostapd_data *hapd);
#else /* CONFIG_PROXYARP */
static inline int dhcp_snoop_init(struct hostapd_data *hapd)
{
return 0;
}
static inline void dhcp_snoop_deinit(struct hostapd_data *hapd)
{
}
#endif /* CONFIG_PROXYARP */
#endif /* DHCP_SNOOP_H */