br_ftph.c

/*
 *************************************************************************
 * Ralink Tech Inc.
 * 5F., No.36, Taiyuan St., Jhubei City,
 * Hsinchu County 302,
 * Taiwan, R.O.C.
 *
 * (c) Copyright 2002-2010, Ralink Technology, Inc.
 *
 * This program is free software; you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation; either version 2 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * This program is distributed in the hope that it will be useful,       *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 * GNU General Public License for more details.                          *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program; if not, write to the                         *
 * Free Software Foundation, Inc.,                                       *
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 *                                                                       *
 *************************************************************************/


#include "rt_config.h"

#ifdef BG_FT_SUPPORT
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
#include <linux/netfilter_bridge.h> 
#include "../net/bridge/br_private.h"

/* extern export symbol in other drivers */
/*
	Example in other drivers:
		UINT32 (*RALINK_FP_Handle)(PNDIS_PACKET pPacket);
		EXPORT_SYMBOL(RALINK_FP_Handle);

	packet_forward()
	{
		UINT32 HandRst = 1;

		......

		if (RALINK_FP_Handle != NULL)
			HandRst = RALINK_FP_Handle(skb);

		if (HandRst != 0)
		{
			/* pass the packet to upper layer */
			skb->protocol = eth_type_trans(skb, skb->dev);
			netif_rx(skb);
		}
	}
*/
UINT32 BG_FTPH_PacketFromApHandle(
	IN		PNDIS_PACKET	pPacket);

#ifdef BG_FT_OPEN_SUPPORT
extern UINT32 (*RALINK_FP_Handle)(PNDIS_PACKET pPacket);
#else
UINT32 (*RALINK_FP_Handle)(PNDIS_PACKET pPacket);
#endif /* BG_FT_OPEN_SUPPORT */




/* --------------------------------- Public -------------------------------- */

/*
========================================================================
Routine Description:
	Init bridge fast path module.

Arguments:
	None

Return Value:
	None

Note:
	Used in module init.
========================================================================
*/
VOID BG_FTPH_Init(VOID)
{
	RALINK_FP_Handle = BG_FTPH_PacketFromApHandle;
}


/*
========================================================================
Routine Description:
	Remove bridge fast path module.

Arguments:
	None

Return Value:
	None

Note:
	Used in module remove.
========================================================================
*/
VOID BG_FTPH_Remove(VOID)
{
	RALINK_FP_Handle = NULL;
} /* End of BG_FTPH_Init */




/*
========================================================================
Routine Description:
	Forward the received packet.

Arguments:
	pPacket			- the received packet

Return Value:
	None

Note:
========================================================================
*/
UINT32 BG_FTPH_PacketFromApHandle(
	IN		PNDIS_PACKET	pPacket)
{
	struct net_device	*pNetDev;
	struct sk_buff		*pRxPkt;
	struct net_bridge_fdb_entry *pSrcFdbEntry, *pDstFdbEntry;


	/* init */
	pRxPkt = RTPKT_TO_OSPKT(pPacket);
	pNetDev = pRxPkt->dev;

	/* if pNetDev is promisc mode ??? */
	DBGPRINT(RT_DEBUG_INFO, ("ft bg> BG_FTPH_PacketFromApHandle\n"));

	if (pNetDev != NULL)
	{
		if (pNetDev->br_port != NULL)
		{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
			pDstFdbEntry = br_fdb_get_hook(pNetDev->br_port->br, pRxPkt->data);
			pSrcFdbEntry = br_fdb_get_hook(pNetDev->br_port->br, pRxPkt->data + 6);
#else
			/* br_fdb_get is not exported symbol, need exported in net/bridge/br.c */
			pDstFdbEntry = br_fdb_get(pNetDev->br_port->br, pRxPkt->data);
			pSrcFdbEntry = br_fdb_get(pNetDev->br_port->br, pRxPkt->data + 6);
#endif

			/* check destination address in bridge forwarding table */
			if ((pSrcFdbEntry == NULL) ||
				(pDstFdbEntry == NULL) ||
				(pDstFdbEntry->is_local) ||
				(pDstFdbEntry->dst == NULL) ||
				(pDstFdbEntry->dst->dev == NULL) ||
				(pDstFdbEntry->dst->dev == pNetDev) ||
				(pNetDev->br_port->state != BR_STATE_FORWARDING) ||
				((pSrcFdbEntry->dst != NULL) &&
					(pSrcFdbEntry->dst->dev != NULL) &&
					(pSrcFdbEntry->dst->dev != pNetDev)))
			{

				goto LabelPassToUpperLayer;
			} /* End of if */

			if ((!pDstFdbEntry->is_local) &&
				(pDstFdbEntry->dst != NULL) &&
				(pDstFdbEntry->dst->dev != NULL))
			{
				pRxPkt->dev = pDstFdbEntry->dst->dev;
				pDstFdbEntry->dst->dev->hard_start_xmit(pRxPkt, pDstFdbEntry->dst->dev);
				return 0;
			} /* End of if */
		} /* End of if */
	} /* End of if */

LabelPassToUpperLayer:
	DBGPRINT(RT_DEBUG_TRACE, ("ft bg> Pass packet to bridge module.\n"));
	return 1;
} /* End of BG_FTPH_PacketFromApHandle */


#endif /* CONFIG_BRIDGE || CONFIG_BRIDGE_MODULE */
#endif /* BG_FT_SUPPORT */

/* End of bg_ftph.c */