/*
* Marvell Wireless LAN device driver: station RX data handling
*
* Copyright (C) 2011, 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 <uapi/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;
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_hdr = (void *)local_rx_pd +
le16_to_cpu(local_rx_pd->rx_pkt_offset);
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;
}
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;
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_AMSDU) {
struct sk_buff_head list;
struct sk_buff *rx_skb;
__skb_queue_head_init(&list);
skb_pull(skb, rx_pkt_offset);
skb_trim(skb, rx_pkt_length);
ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
priv->wdev->iftype, 0, false);
while (!skb_queue_empty(&list)) {
rx_skb = __skb_dequeue(&list);
ret = mwifiex_recv_packet(priv, rx_skb);
if (ret == -1)
dev_err(adapter->dev, "Rx of A-MSDU failed");
}
return 0;
} else 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) ||
!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)) {
memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
} 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;
}