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;
  40         struct ipv6hdr *ipv6;
  41         struct icmp6hdr *icmpv6;
  42
  43         eth = (struct ethhdr *)skb->data;
  44         switch (ntohs(eth->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;
  91
  92         local_rx_pd = (struct rxpd *) (skb->data);
  93
  94         rx_pkt_hdr = (void *)local_rx_pd +
  95                      le16_to_cpu(local_rx_pd->rx_pkt_offset);
  96
  97         if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
  98                      sizeof(bridge_tunnel_header))) ||
  99             (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
 100                      sizeof(rfc1042_header)) &&
 101              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
 102              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
 103                 /*
 104                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
 105                  *    EthernetII header, keep the src/dst and snap_type
 106                  *    (ethertype).
 107                  *  The firmware only passes up SNAP frames converting
 108                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 109                  *  To create the Ethernet II, just move the src, dst address
 110                  *    right before the snap_type.
 111                  */
 112                 eth = (struct ethhdr *)
 113                         ((u8 *) &rx_pkt_hdr->eth803_hdr
 114                          + sizeof(rx_pkt_hdr->eth803_hdr) +
 115                          sizeof(rx_pkt_hdr->rfc1042_hdr)
 116                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 117                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 118                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 119
 120                 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 121                        sizeof(eth->h_source));
 122                 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 123                        sizeof(eth->h_dest));
 124
 125                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
 126                    header that was removed. */
 127                 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
 128         } else {
 129                 /* Chop off the rxpd */
 130                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
 131                         (u8 *) local_rx_pd;
 132         }
 133
 134         /* Chop off the leading header bytes so the it points to the start of
 135            either the reconstructed EthII frame or the 802.2/llc/snap frame */
 136         skb_pull(skb, hdr_chop);
 137
 138         if (priv->hs2_enabled &&
 139             mwifiex_discard_gratuitous_arp(priv, skb)) {
 140                 dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
 141                 dev_kfree_skb_any(skb);
 142                 return 0;
 143         }
 144
 145         priv->rxpd_rate = local_rx_pd->rx_rate;
 146
 147         priv->rxpd_htinfo = local_rx_pd->ht_info;
 148
 149         ret = mwifiex_recv_packet(priv, skb);
 150         if (ret == -1)
 151                 dev_err(priv->adapter->dev, "recv packet failed\n");
 152
 153         return ret;
 154 }
 155
 156 /*
 157  * This function processes the received buffer.
 158  *
 159  * The function looks into the RxPD and performs sanity tests on the
 160  * received buffer to ensure its a valid packet, before processing it
 161  * further. If the packet is determined to be aggregated, it is
 162  * de-aggregated accordingly. Non-unicast packets are sent directly to
 163  * the kernel/upper layers. Unicast packets are handed over to the
 164  * Rx reordering routine if 11n is enabled.
 165  *
 166  * The completion callback is called after processing in complete.
 167  */
 168 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 169                                   struct sk_buff *skb)
 170 {
 171         struct mwifiex_adapter *adapter = priv->adapter;
 172         int ret = 0;
 173         struct rxpd *local_rx_pd;
 174         struct rx_packet_hdr *rx_pkt_hdr;
 175         u8 ta[ETH_ALEN];
 176         u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 177
 178         local_rx_pd = (struct rxpd *) (skb->data);
 179         rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 180         rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 181         rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 182         seq_num = le16_to_cpu(local_rx_pd->seq_num);
 183
 184         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
 185
 186         if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 187                 dev_err(adapter->dev,
 188                         "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 189                         skb->len, rx_pkt_offset, rx_pkt_length);
 190                 priv->stats.rx_dropped++;
 191                 dev_kfree_skb_any(skb);
 192                 return ret;
 193         }
 194
 195         if (rx_pkt_type == PKT_TYPE_AMSDU) {
 196                 struct sk_buff_head list;
 197                 struct sk_buff *rx_skb;
 198
 199                 __skb_queue_head_init(&list);
 200
 201                 skb_pull(skb, rx_pkt_offset);
 202                 skb_trim(skb, rx_pkt_length);
 203
 204                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
 205                                          priv->wdev->iftype, 0, false);
 206
 207                 while (!skb_queue_empty(&list)) {
 208                         rx_skb = __skb_dequeue(&list);
 209                         ret = mwifiex_recv_packet(priv, rx_skb);
 210                         if (ret == -1)
 211                                 dev_err(adapter->dev, "Rx of A-MSDU failed");
 212                 }
 213                 return 0;
 214         } else if (rx_pkt_type == PKT_TYPE_MGMT) {
 215                 ret = mwifiex_process_mgmt_packet(priv, skb);
 216                 if (ret)
 217                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 218                 dev_kfree_skb_any(skb);
 219                 return ret;
 220         }
 221
 222         /*
 223          * If the packet is not an unicast packet then send the packet
 224          * directly to os. Don't pass thru rx reordering
 225          */
 226         if (!IS_11N_ENABLED(priv) ||
 227             !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
 228                 mwifiex_process_rx_packet(priv, skb);
 229                 return ret;
 230         }
 231
 232         if (mwifiex_queuing_ra_based(priv)) {
 233                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 234         } else {
 235                 if (rx_pkt_type != PKT_TYPE_BAR)
 236                         priv->rx_seq[local_rx_pd->priority] = seq_num;
 237                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 238                        ETH_ALEN);
 239         }
 240
 241         /* Reorder and send to OS */
 242         ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
 243                                          ta, (u8) rx_pkt_type, skb);
 244
 245         if (ret || (rx_pkt_type == PKT_TYPE_BAR))
 246                 dev_kfree_skb_any(skb);
 247
 248         if (ret)
 249                 priv->stats.rx_dropped++;
 250
 251         return ret;
 252 }