drivers/net/wireless/mwifiex/sta_rx.c

   1 /*
   2  * Marvell Wireless LAN device driver: station RX data handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include <uapi/linux/ipv6.h>
  21 #include <net/ndisc.h>
  22 #include "decl.h"
  23 #include "ioctl.h"
  24 #include "util.h"
  25 #include "fw.h"
  26 #include "main.h"
  27 #include "11n_aggr.h"
  28 #include "11n_rxreorder.h"
  29
  30 /* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
  31  * frame. If frame has both source and destination mac address as same, this
  32  * function drops such gratuitous frames.
  33  */
  34 static bool
  35 mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
  36                                struct sk_buff *skb)
  37 {
  38         const struct mwifiex_arp_eth_header *arp;
  39         struct ethhdr *eth_hdr;
  40         struct ipv6hdr *ipv6;
  41         struct icmp6hdr *icmpv6;
  42
  43         eth_hdr = (struct ethhdr *)skb->data;
  44         switch (ntohs(eth_hdr->h_proto)) {
  45         case ETH_P_ARP:
  46                 arp = (void *)(skb->data + sizeof(struct ethhdr));
  47                 if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
  48                     arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
  49                         if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
  50                                 return true;
  51                 }
  52                 break;
  53         case ETH_P_IPV6:
  54                 ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
  55                 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
  56                                   sizeof(struct ipv6hdr));
  57                 if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
  58                         if (!memcmp(&ipv6->saddr, &ipv6->daddr,
  59                                     sizeof(struct in6_addr)))
  60                                 return true;
  61                 }
  62                 break;
  63         default:
  64                 break;
  65         }
  66
  67         return false;
  68 }
  69
  70 /*
  71  * This function processes the received packet and forwards it
  72  * to kernel/upper layer.
  73  *
  74  * This function parses through the received packet and determines
  75  * if it is a debug packet or normal packet.
  76  *
  77  * For non-debug packets, the function chops off unnecessary leading
  78  * header bytes, reconstructs the packet as an ethernet frame or
  79  * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
  80  *
  81  * The completion callback is called after processing in complete.
  82  */
  83 int mwifiex_process_rx_packet(struct mwifiex_private *priv,
  84                               struct sk_buff *skb)
  85 {
  86         int ret;
  87         struct rx_packet_hdr *rx_pkt_hdr;
  88         struct rxpd *local_rx_pd;
  89         int hdr_chop;
  90         struct ethhdr *eth_hdr;
  91         u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  92
  93         local_rx_pd = (struct rxpd *) (skb->data);
  94
  95         rx_pkt_hdr = (void *)local_rx_pd +
  96                      le16_to_cpu(local_rx_pd->rx_pkt_offset);
  97
  98         if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
  99                     rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
 100                 /*
 101                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
 102                  *    EthernetII header, keep the src/dst and snap_type
 103                  *    (ethertype).
 104                  *  The firmware only passes up SNAP frames converting
 105                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 106                  *  To create the Ethernet II, just move the src, dst address
 107                  *    right before the snap_type.
 108                  */
 109                 eth_hdr = (struct ethhdr *)
 110                         ((u8 *) &rx_pkt_hdr->eth803_hdr
 111                          + sizeof(rx_pkt_hdr->eth803_hdr) +
 112                          sizeof(rx_pkt_hdr->rfc1042_hdr)
 113                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 114                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 115                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 116
 117                 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 118                        sizeof(eth_hdr->h_source));
 119                 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 120                        sizeof(eth_hdr->h_dest));
 121
 122                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
 123                    header that was removed. */
 124                 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
 125         } else {
 126                 /* Chop off the rxpd */
 127                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
 128                         (u8 *) local_rx_pd;
 129         }
 130
 131         /* Chop off the leading header bytes so the it points to the start of
 132            either the reconstructed EthII frame or the 802.2/llc/snap frame */
 133         skb_pull(skb, hdr_chop);
 134
 135         if (priv->hs2_enabled &&
 136             mwifiex_discard_gratuitous_arp(priv, skb)) {
 137                 dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
 138                 dev_kfree_skb_any(skb);
 139                 return 0;
 140         }
 141
 142         priv->rxpd_rate = local_rx_pd->rx_rate;
 143
 144         priv->rxpd_htinfo = local_rx_pd->ht_info;
 145
 146         ret = mwifiex_recv_packet(priv, skb);
 147         if (ret == -1)
 148                 dev_err(priv->adapter->dev, "recv packet failed\n");
 149
 150         return ret;
 151 }
 152
 153 /*
 154  * This function processes the received buffer.
 155  *
 156  * The function looks into the RxPD and performs sanity tests on the
 157  * received buffer to ensure its a valid packet, before processing it
 158  * further. If the packet is determined to be aggregated, it is
 159  * de-aggregated accordingly. Non-unicast packets are sent directly to
 160  * the kernel/upper layers. Unicast packets are handed over to the
 161  * Rx reordering routine if 11n is enabled.
 162  *
 163  * The completion callback is called after processing in complete.
 164  */
 165 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 166                                   struct sk_buff *skb)
 167 {
 168         struct mwifiex_adapter *adapter = priv->adapter;
 169         int ret = 0;
 170         struct rxpd *local_rx_pd;
 171         struct rx_packet_hdr *rx_pkt_hdr;
 172         u8 ta[ETH_ALEN];
 173         u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 174
 175         local_rx_pd = (struct rxpd *) (skb->data);
 176         rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 177         rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 178         rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 179         seq_num = le16_to_cpu(local_rx_pd->seq_num);
 180
 181         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
 182
 183         if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 184                 dev_err(adapter->dev,
 185                         "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 186                         skb->len, rx_pkt_offset, rx_pkt_length);
 187                 priv->stats.rx_dropped++;
 188
 189                 if (adapter->if_ops.data_complete)
 190                         adapter->if_ops.data_complete(adapter, skb);
 191                 else
 192                         dev_kfree_skb_any(skb);
 193
 194                 return ret;
 195         }
 196
 197         if (rx_pkt_type == PKT_TYPE_AMSDU) {
 198                 struct sk_buff_head list;
 199                 struct sk_buff *rx_skb;
 200
 201                 __skb_queue_head_init(&list);
 202
 203                 skb_pull(skb, rx_pkt_offset);
 204                 skb_trim(skb, rx_pkt_length);
 205
 206                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
 207                                          priv->wdev->iftype, 0, false);
 208
 209                 while (!skb_queue_empty(&list)) {
 210                         rx_skb = __skb_dequeue(&list);
 211                         ret = mwifiex_recv_packet(priv, rx_skb);
 212                         if (ret == -1)
 213                                 dev_err(adapter->dev, "Rx of A-MSDU failed");
 214                 }
 215                 return 0;
 216         } else if (rx_pkt_type == PKT_TYPE_MGMT) {
 217                 ret = mwifiex_process_mgmt_packet(priv, skb);
 218                 if (ret)
 219                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 220                 dev_kfree_skb_any(skb);
 221                 return ret;
 222         }
 223
 224         /*
 225          * If the packet is not an unicast packet then send the packet
 226          * directly to os. Don't pass thru rx reordering
 227          */
 228         if (!IS_11N_ENABLED(priv) ||
 229             memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
 230                 mwifiex_process_rx_packet(priv, skb);
 231                 return ret;
 232         }
 233
 234         if (mwifiex_queuing_ra_based(priv)) {
 235                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 236         } else {
 237                 if (rx_pkt_type != PKT_TYPE_BAR)
 238                         priv->rx_seq[local_rx_pd->priority] = seq_num;
 239                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 240                        ETH_ALEN);
 241         }
 242
 243         /* Reorder and send to OS */
 244         ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
 245                                          ta, (u8) rx_pkt_type, skb);
 246
 247         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
 248                 if (adapter->if_ops.data_complete)
 249                         adapter->if_ops.data_complete(adapter, skb);
 250                 else
 251                         dev_kfree_skb_any(skb);
 252         }
 253
 254         if (ret)
 255                 priv->stats.rx_dropped++;
 256
 257         return ret;
 258 }