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271 lines
8.7 KiB
271 lines
8.7 KiB
/* |
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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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* This software file (the "File") is distributed by NXP |
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* under the terms of the GNU General Public License Version 2, June 1991 |
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* (the "License"). You may use, redistribute and/or modify this File in |
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* accordance with the terms and conditions of the License, a copy of which |
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* is available by writing to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the |
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* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. |
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* |
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE |
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about |
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* this warranty disclaimer. |
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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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|
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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 ((!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) > (u16) 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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