drivers/net/wireless/mwifiex/sta_rx.c - vendor/opensource/backports - Git at Google

 /*
  * Marvell Wireless LAN device driver: station RX data handling
  *
  * Copyright (C) 2011-2014, Marvell International Ltd.
  *
  * This software file (the "File") is distributed by Marvell International
  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
  * (the "License").  You may use, redistribute and/or modify this File in
  * accordance with the terms and conditions of the License, a copy of which
  * is available by writing to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  *
  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  * this warranty disclaimer.
  */

 #include <linux/ipv6.h>
 #include <net/ndisc.h>
 #include "decl.h"
 #include "ioctl.h"
 #include "util.h"
 #include "fw.h"
 #include "main.h"
 #include "11n_aggr.h"
 #include "11n_rxreorder.h"

 /* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
  * frame. If frame has both source and destination mac address as same, this
  * function drops such gratuitous frames.
  */
 static bool
 mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
 			       struct sk_buff *skb)
 {
 	const struct mwifiex_arp_eth_header *arp;
 	struct ethhdr *eth;
 	struct ipv6hdr *ipv6;
 	struct icmp6hdr *icmpv6;

 	eth = (struct ethhdr *)skb->data;
 	switch (ntohs(eth->h_proto)) {
 	case ETH_P_ARP:
 		arp = (void *)(skb->data + sizeof(struct ethhdr));
 		if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
 		    arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
 			if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
 				return true;
 		}
 		break;
 	case ETH_P_IPV6:
 		ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
 		icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
 				  sizeof(struct ipv6hdr));
 		if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
 			if (!memcmp(&ipv6->saddr, &ipv6->daddr,
 				    sizeof(struct in6_addr)))
 				return true;
 		}
 		break;
 	default:
 		break;
 	}

 	return false;
 }

 /*
  * This function processes the received packet and forwards it
  * to kernel/upper layer.
  *
  * This function parses through the received packet and determines
  * if it is a debug packet or normal packet.
  *
  * For non-debug packets, the function chops off unnecessary leading
  * header bytes, reconstructs the packet as an ethernet frame or
  * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
  *
  * The completion callback is called after processing in complete.
  */
 int mwifiex_process_rx_packet(struct mwifiex_private *priv,
 			      struct sk_buff *skb)
 {
 	int ret;
 	struct rx_packet_hdr *rx_pkt_hdr;
 	struct rxpd *local_rx_pd;
 	int hdr_chop;
 	struct ethhdr *eth;
 	u16 rx_pkt_off, rx_pkt_len;
 	u8 *offset;

 	local_rx_pd = (struct rxpd *) (skb->data);

 	rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 	rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
 	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;

 	if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
 		     sizeof(bridge_tunnel_header))) ||
 	    (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
 		     sizeof(rfc1042_header)) &&
 	     ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
 	     ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
 		/*
 		 *  Replace the 803 header and rfc1042 header (llc/snap) with an
 		 *    EthernetII header, keep the src/dst and snap_type
 		 *    (ethertype).
 		 *  The firmware only passes up SNAP frames converting
 		 *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 		 *  To create the Ethernet II, just move the src, dst address
 		 *    right before the snap_type.
 		 */
 		eth = (struct ethhdr *)
 			((u8 *) &rx_pkt_hdr->eth803_hdr
 			 + sizeof(rx_pkt_hdr->eth803_hdr) +
 			 sizeof(rx_pkt_hdr->rfc1042_hdr)
 			 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 			 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 			 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));

 		memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 		       sizeof(eth->h_source));
 		memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 		       sizeof(eth->h_dest));

 		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
 		   header that was removed. */
 		hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
 	} else {
 		/* Chop off the rxpd */
 		hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
 			(u8 *) local_rx_pd;
 	}

 	/* Chop off the leading header bytes so the it points to the start of
 	   either the reconstructed EthII frame or the 802.2/llc/snap frame */
 	skb_pull(skb, hdr_chop);

 	if (priv->hs2_enabled &&
 	    mwifiex_discard_gratuitous_arp(priv, skb)) {
 		dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
 		dev_kfree_skb_any(skb);
 		return 0;
 	}

 	if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 	    ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
 		offset = (u8 *)local_rx_pd + rx_pkt_off;
 		mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
 	}

 	priv->rxpd_rate = local_rx_pd->rx_rate;

 	priv->rxpd_htinfo = local_rx_pd->ht_info;

 	ret = mwifiex_recv_packet(priv, skb);
 	if (ret == -1)
 		dev_err(priv->adapter->dev, "recv packet failed\n");

 	return ret;
 }

 /*
  * This function processes the received buffer.
  *
  * The function looks into the RxPD and performs sanity tests on the
  * received buffer to ensure its a valid packet, before processing it
  * further. If the packet is determined to be aggregated, it is
  * de-aggregated accordingly. Non-unicast packets are sent directly to
  * the kernel/upper layers. Unicast packets are handed over to the
  * Rx reordering routine if 11n is enabled.
  *
  * The completion callback is called after processing in complete.
  */
 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 				  struct sk_buff *skb)
 {
 	struct mwifiex_adapter *adapter = priv->adapter;
 	int ret = 0;
 	struct rxpd *local_rx_pd;
 	struct rx_packet_hdr *rx_pkt_hdr;
 	u8 ta[ETH_ALEN];
 	u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 	struct mwifiex_sta_node *sta_ptr;

 	local_rx_pd = (struct rxpd *) (skb->data);
 	rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 	rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 	rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 	seq_num = le16_to_cpu(local_rx_pd->seq_num);

 	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;

 	if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 		dev_err(adapter->dev,
 			"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 			skb->len, rx_pkt_offset, rx_pkt_length);
 		priv->stats.rx_dropped++;
 		dev_kfree_skb_any(skb);
 		return ret;
 	}

 	if (rx_pkt_type == PKT_TYPE_MGMT) {
 		ret = mwifiex_process_mgmt_packet(priv, skb);
 		if (ret)
 			dev_err(adapter->dev, "Rx of mgmt packet failed");
 		dev_kfree_skb_any(skb);
 		return ret;
 	}

 	/*
 	 * If the packet is not an unicast packet then send the packet
 	 * directly to os. Don't pass thru rx reordering
 	 */
 	if ((!IS_11N_ENABLED(priv) &&
 	     !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 	       !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
 	    !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
 		mwifiex_process_rx_packet(priv, skb);
 		return ret;
 	}

 	if (mwifiex_queuing_ra_based(priv) ||
 	    (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 	     local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
 		memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 		if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
 		    local_rx_pd->priority < MAX_NUM_TID) {
 			sta_ptr = mwifiex_get_sta_entry(priv, ta);
 			if (sta_ptr)
 				sta_ptr->rx_seq[local_rx_pd->priority] =
 					      le16_to_cpu(local_rx_pd->seq_num);
 		}
 	} else {
 		if (rx_pkt_type != PKT_TYPE_BAR)
 			priv->rx_seq[local_rx_pd->priority] = seq_num;
 		memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 		       ETH_ALEN);
 	}

 	/* Reorder and send to OS */
 	ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
 					 ta, (u8) rx_pkt_type, skb);

 	if (ret || (rx_pkt_type == PKT_TYPE_BAR))
 		dev_kfree_skb_any(skb);

 	if (ret)
 		priv->stats.rx_dropped++;

 	return ret;
 }
	/*
	* Marvell Wireless LAN device driver: station RX data handling
	*
	* Copyright (C) 2011-2014, Marvell International Ltd.
	*
	* This software file (the "File") is distributed by Marvell International
	* Ltd. under the terms of the GNU General Public License Version 2, June 1991
	* (the "License"). You may use, redistribute and/or modify this File in
	* accordance with the terms and conditions of the License, a copy of which
	* is available by writing to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
	* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
	*
	* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
	* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
	* this warranty disclaimer.
	*/

	#include <linux/ipv6.h>
	#include <net/ndisc.h>
	#include "decl.h"
	#include "ioctl.h"
	#include "util.h"
	#include "fw.h"
	#include "main.h"
	#include "11n_aggr.h"
	#include "11n_rxreorder.h"

	/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
	* frame. If frame has both source and destination mac address as same, this
	* function drops such gratuitous frames.
	*/
	static bool
	mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
	struct sk_buff *skb)
	{
	const struct mwifiex_arp_eth_header *arp;
	struct ethhdr *eth;
	struct ipv6hdr *ipv6;
	struct icmp6hdr *icmpv6;

	eth = (struct ethhdr *)skb->data;
	switch (ntohs(eth->h_proto)) {
	case ETH_P_ARP:
	arp = (void *)(skb->data + sizeof(struct ethhdr));
	if (arp->hdr.ar_op == htons(ARPOP_REPLY) \|\|
	arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
	if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
	return true;
	}
	break;
	case ETH_P_IPV6:
	ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
	icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
	sizeof(struct ipv6hdr));
	if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
	if (!memcmp(&ipv6->saddr, &ipv6->daddr,
	sizeof(struct in6_addr)))
	return true;
	}
	break;
	default:
	break;
	}

	return false;
	}

	/*
	* This function processes the received packet and forwards it
	* to kernel/upper layer.
	*
	* This function parses through the received packet and determines
	* if it is a debug packet or normal packet.
	*
	* For non-debug packets, the function chops off unnecessary leading
	* header bytes, reconstructs the packet as an ethernet frame or
	* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
	*
	* The completion callback is called after processing in complete.
	*/
	int mwifiex_process_rx_packet(struct mwifiex_private *priv,
	struct sk_buff *skb)
	{
	int ret;
	struct rx_packet_hdr *rx_pkt_hdr;
	struct rxpd *local_rx_pd;
	int hdr_chop;
	struct ethhdr *eth;
	u16 rx_pkt_off, rx_pkt_len;
	u8 *offset;

	local_rx_pd = (struct rxpd *) (skb->data);

	rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
	rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;

	if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
	sizeof(bridge_tunnel_header))) \|\|
	(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
	sizeof(rfc1042_header)) &&
	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
	/*
	* Replace the 803 header and rfc1042 header (llc/snap) with an
	* EthernetII header, keep the src/dst and snap_type
	* (ethertype).
	* The firmware only passes up SNAP frames converting
	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	* To create the Ethernet II, just move the src, dst address
	* right before the snap_type.
	*/
	eth = (struct ethhdr *)
	((u8 *) &rx_pkt_hdr->eth803_hdr
	+ sizeof(rx_pkt_hdr->eth803_hdr) +
	sizeof(rx_pkt_hdr->rfc1042_hdr)
	- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
	- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
	- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));

	memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
	sizeof(eth->h_source));
	memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
	sizeof(eth->h_dest));

	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
	header that was removed. */
	hdr_chop = (u8 ) eth - (u8 ) local_rx_pd;
	} else {
	/* Chop off the rxpd */
	hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
	(u8 *) local_rx_pd;
	}

	/* Chop off the leading header bytes so the it points to the start of
	either the reconstructed EthII frame or the 802.2/llc/snap frame */
	skb_pull(skb, hdr_chop);

	if (priv->hs2_enabled &&
	mwifiex_discard_gratuitous_arp(priv, skb)) {
	dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
	dev_kfree_skb_any(skb);
	return 0;
	}

	if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
	ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
	offset = (u8 *)local_rx_pd + rx_pkt_off;
	mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
	}

	priv->rxpd_rate = local_rx_pd->rx_rate;

	priv->rxpd_htinfo = local_rx_pd->ht_info;

	ret = mwifiex_recv_packet(priv, skb);
	if (ret == -1)
	dev_err(priv->adapter->dev, "recv packet failed\n");

	return ret;
	}

	/*
	* This function processes the received buffer.
	*
	* The function looks into the RxPD and performs sanity tests on the
	* received buffer to ensure its a valid packet, before processing it
	* further. If the packet is determined to be aggregated, it is
	* de-aggregated accordingly. Non-unicast packets are sent directly to
	* the kernel/upper layers. Unicast packets are handed over to the
	* Rx reordering routine if 11n is enabled.
	*
	* The completion callback is called after processing in complete.
	*/
	int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
	struct sk_buff *skb)
	{
	struct mwifiex_adapter *adapter = priv->adapter;
	int ret = 0;
	struct rxpd *local_rx_pd;
	struct rx_packet_hdr *rx_pkt_hdr;
	u8 ta[ETH_ALEN];
	u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
	struct mwifiex_sta_node *sta_ptr;

	local_rx_pd = (struct rxpd *) (skb->data);
	rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
	rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
	rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
	seq_num = le16_to_cpu(local_rx_pd->seq_num);

	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;

	if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
	dev_err(adapter->dev,
	"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
	skb->len, rx_pkt_offset, rx_pkt_length);
	priv->stats.rx_dropped++;
	dev_kfree_skb_any(skb);
	return ret;
	}

	if (rx_pkt_type == PKT_TYPE_MGMT) {
	ret = mwifiex_process_mgmt_packet(priv, skb);
	if (ret)
	dev_err(adapter->dev, "Rx of mgmt packet failed");
	dev_kfree_skb_any(skb);
	return ret;
	}

	/*
	* If the packet is not an unicast packet then send the packet
	* directly to os. Don't pass thru rx reordering
	*/
	if ((!IS_11N_ENABLED(priv) &&
	!(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
	!(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) \|\|
	!ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
	mwifiex_process_rx_packet(priv, skb);
	return ret;
	}

	if (mwifiex_queuing_ra_based(priv) \|\|
	(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
	local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
	memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
	if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
	local_rx_pd->priority < MAX_NUM_TID) {
	sta_ptr = mwifiex_get_sta_entry(priv, ta);
	if (sta_ptr)
	sta_ptr->rx_seq[local_rx_pd->priority] =
	le16_to_cpu(local_rx_pd->seq_num);
	}
	} else {
	if (rx_pkt_type != PKT_TYPE_BAR)
	priv->rx_seq[local_rx_pd->priority] = seq_num;
	memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
	ETH_ALEN);
	}

	/* Reorder and send to OS */
	ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
	ta, (u8) rx_pkt_type, skb);

	if (ret \|\| (rx_pkt_type == PKT_TYPE_BAR))
	dev_kfree_skb_any(skb);

	if (ret)
	priv->stats.rx_dropped++;

	return ret;
	}