270 lines
8.3 KiB
C
270 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* NXP Wireless LAN device driver: station RX data handling
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*
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* Copyright 2011-2020 NXP
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*/
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#include <uapi/linux/ipv6.h>
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#include <net/ndisc.h>
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#include "decl.h"
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#include "ioctl.h"
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#include "util.h"
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#include "fw.h"
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#include "main.h"
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#include "11n_aggr.h"
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#include "11n_rxreorder.h"
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/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
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* frame. If frame has both source and destination mac address as same, this
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* function drops such gratuitous frames.
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*/
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static bool
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mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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const struct mwifiex_arp_eth_header *arp;
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struct ethhdr *eth;
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struct ipv6hdr *ipv6;
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struct icmp6hdr *icmpv6;
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eth = (struct ethhdr *)skb->data;
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switch (ntohs(eth->h_proto)) {
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case ETH_P_ARP:
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arp = (void *)(skb->data + sizeof(struct ethhdr));
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if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
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arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
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if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
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return true;
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}
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break;
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case ETH_P_IPV6:
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ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
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icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
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sizeof(struct ipv6hdr));
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if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
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if (!memcmp(&ipv6->saddr, &ipv6->daddr,
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sizeof(struct in6_addr)))
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return true;
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}
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break;
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default:
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break;
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}
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return false;
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}
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/*
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* This function processes the received packet and forwards it
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* to kernel/upper layer.
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*
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* This function parses through the received packet and determines
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* if it is a debug packet or normal packet.
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*
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* For non-debug packets, the function chops off unnecessary leading
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* header bytes, reconstructs the packet as an ethernet frame or
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* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
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*
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* The completion callback is called after processing in complete.
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*/
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int mwifiex_process_rx_packet(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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int ret;
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struct rx_packet_hdr *rx_pkt_hdr;
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struct rxpd *local_rx_pd;
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int hdr_chop;
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struct ethhdr *eth;
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u16 rx_pkt_off, rx_pkt_len;
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u8 *offset;
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u8 adj_rx_rate = 0;
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local_rx_pd = (struct rxpd *) (skb->data);
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rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
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rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
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rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
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if (sizeof(*rx_pkt_hdr) + rx_pkt_off > skb->len) {
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mwifiex_dbg(priv->adapter, ERROR,
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"wrong rx packet offset: len=%d, rx_pkt_off=%d\n",
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skb->len, rx_pkt_off);
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priv->stats.rx_dropped++;
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dev_kfree_skb_any(skb);
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return -1;
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}
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if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
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sizeof(bridge_tunnel_header))) ||
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(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
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sizeof(rfc1042_header)) &&
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ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
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ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
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/*
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* Replace the 803 header and rfc1042 header (llc/snap) with an
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* EthernetII header, keep the src/dst and snap_type
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* (ethertype).
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* The firmware only passes up SNAP frames converting
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* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
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* To create the Ethernet II, just move the src, dst address
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* right before the snap_type.
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*/
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eth = (struct ethhdr *)
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((u8 *) &rx_pkt_hdr->eth803_hdr
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+ sizeof(rx_pkt_hdr->eth803_hdr) +
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sizeof(rx_pkt_hdr->rfc1042_hdr)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
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- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
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memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
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sizeof(eth->h_source));
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memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
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sizeof(eth->h_dest));
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/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
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header that was removed. */
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hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
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} else {
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/* Chop off the rxpd */
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hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
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(u8 *) local_rx_pd;
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}
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/* Chop off the leading header bytes so the it points to the start of
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either the reconstructed EthII frame or the 802.2/llc/snap frame */
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skb_pull(skb, hdr_chop);
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if (priv->hs2_enabled &&
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mwifiex_discard_gratuitous_arp(priv, skb)) {
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mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
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dev_kfree_skb_any(skb);
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return 0;
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}
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if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
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ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
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offset = (u8 *)local_rx_pd + rx_pkt_off;
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mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
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}
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/* Only stash RX bitrate for unicast packets. */
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if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
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priv->rxpd_rate = local_rx_pd->rx_rate;
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priv->rxpd_htinfo = local_rx_pd->ht_info;
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}
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
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GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
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adj_rx_rate = mwifiex_adjust_data_rate(priv,
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local_rx_pd->rx_rate,
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local_rx_pd->ht_info);
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mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
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local_rx_pd->nf);
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}
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ret = mwifiex_recv_packet(priv, skb);
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if (ret == -1)
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mwifiex_dbg(priv->adapter, ERROR,
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"recv packet failed\n");
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return ret;
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}
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/*
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* This function processes the received buffer.
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*
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* The function looks into the RxPD and performs sanity tests on the
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* received buffer to ensure its a valid packet, before processing it
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* further. If the packet is determined to be aggregated, it is
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* de-aggregated accordingly. Non-unicast packets are sent directly to
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* the kernel/upper layers. Unicast packets are handed over to the
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* Rx reordering routine if 11n is enabled.
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*
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* The completion callback is called after processing in complete.
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*/
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int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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int ret = 0;
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struct rxpd *local_rx_pd;
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struct rx_packet_hdr *rx_pkt_hdr;
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u8 ta[ETH_ALEN];
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u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
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struct mwifiex_sta_node *sta_ptr;
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local_rx_pd = (struct rxpd *) (skb->data);
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rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
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rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
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rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
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seq_num = le16_to_cpu(local_rx_pd->seq_num);
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rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
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if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
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sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
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mwifiex_dbg(adapter, ERROR,
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"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
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skb->len, rx_pkt_offset, rx_pkt_length);
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priv->stats.rx_dropped++;
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dev_kfree_skb_any(skb);
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return ret;
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}
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if (rx_pkt_type == PKT_TYPE_MGMT) {
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ret = mwifiex_process_mgmt_packet(priv, skb);
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if (ret)
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mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
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dev_kfree_skb_any(skb);
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return ret;
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}
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/*
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* If the packet is not an unicast packet then send the packet
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* directly to os. Don't pass thru rx reordering
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*/
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if ((!IS_11N_ENABLED(priv) &&
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!(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
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!(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
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!ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
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mwifiex_process_rx_packet(priv, skb);
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return ret;
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}
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if (mwifiex_queuing_ra_based(priv) ||
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(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
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local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
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memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
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if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
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local_rx_pd->priority < MAX_NUM_TID) {
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sta_ptr = mwifiex_get_sta_entry(priv, ta);
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if (sta_ptr)
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sta_ptr->rx_seq[local_rx_pd->priority] =
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le16_to_cpu(local_rx_pd->seq_num);
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mwifiex_auto_tdls_update_peer_signal(priv, ta,
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local_rx_pd->snr,
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local_rx_pd->nf);
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}
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} else {
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if (rx_pkt_type != PKT_TYPE_BAR &&
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local_rx_pd->priority < MAX_NUM_TID)
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priv->rx_seq[local_rx_pd->priority] = seq_num;
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memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
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ETH_ALEN);
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}
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/* Reorder and send to OS */
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ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
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ta, (u8) rx_pkt_type, skb);
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if (ret || (rx_pkt_type == PKT_TYPE_BAR))
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dev_kfree_skb_any(skb);
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if (ret)
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priv->stats.rx_dropped++;
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return ret;
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}
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