drivers/net/wireless/mwifiex/sta_rx.c

   1 /*
   2  * Marvell Wireless LAN device driver: station RX data handling
   3  *
   4  * Copyright (C) 2011-2014, 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         u16 rx_pkt_off, rx_pkt_len;
  92         u8 *offset;
  93
  94         local_rx_pd = (struct rxpd *) (skb->data);
  95
  96         rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
  97         rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
  98         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
  99
 100         if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
 101                      sizeof(bridge_tunnel_header))) ||
 102             (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
 103                      sizeof(rfc1042_header)) &&
 104              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
 105              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
 106                 /*
 107                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
 108                  *    EthernetII header, keep the src/dst and snap_type
 109                  *    (ethertype).
 110                  *  The firmware only passes up SNAP frames converting
 111                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 112                  *  To create the Ethernet II, just move the src, dst address
 113                  *    right before the snap_type.
 114                  */
 115                 eth = (struct ethhdr *)
 116                         ((u8 *) &rx_pkt_hdr->eth803_hdr
 117                          + sizeof(rx_pkt_hdr->eth803_hdr) +
 118                          sizeof(rx_pkt_hdr->rfc1042_hdr)
 119                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 120                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 121                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 122
 123                 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 124                        sizeof(eth->h_source));
 125                 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 126                        sizeof(eth->h_dest));
 127
 128                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
 129                    header that was removed. */
 130                 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
 131         } else {
 132                 /* Chop off the rxpd */
 133                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
 134                         (u8 *) local_rx_pd;
 135         }
 136
 137         /* Chop off the leading header bytes so the it points to the start of
 138            either the reconstructed EthII frame or the 802.2/llc/snap frame */
 139         skb_pull(skb, hdr_chop);
 140
 141         if (priv->hs2_enabled &&
 142             mwifiex_discard_gratuitous_arp(priv, skb)) {
 143                 dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
 144                 dev_kfree_skb_any(skb);
 145                 return 0;
 146         }
 147
 148         if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 149             ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
 150                 offset = (u8 *)local_rx_pd + rx_pkt_off;
 151                 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
 152         }
 153
 154         priv->rxpd_rate = local_rx_pd->rx_rate;
 155
 156         priv->rxpd_htinfo = local_rx_pd->ht_info;
 157
 158         ret = mwifiex_recv_packet(priv, skb);
 159         if (ret == -1)
 160                 dev_err(priv->adapter->dev, "recv packet failed\n");
 161
 162         return ret;
 163 }
 164
 165 /*
 166  * This function processes the received buffer.
 167  *
 168  * The function looks into the RxPD and performs sanity tests on the
 169  * received buffer to ensure its a valid packet, before processing it
 170  * further. If the packet is determined to be aggregated, it is
 171  * de-aggregated accordingly. Non-unicast packets are sent directly to
 172  * the kernel/upper layers. Unicast packets are handed over to the
 173  * Rx reordering routine if 11n is enabled.
 174  *
 175  * The completion callback is called after processing in complete.
 176  */
 177 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 178                                   struct sk_buff *skb)
 179 {
 180         struct mwifiex_adapter *adapter = priv->adapter;
 181         int ret = 0;
 182         struct rxpd *local_rx_pd;
 183         struct rx_packet_hdr *rx_pkt_hdr;
 184         u8 ta[ETH_ALEN];
 185         u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 186         struct mwifiex_sta_node *sta_ptr;
 187
 188         local_rx_pd = (struct rxpd *) (skb->data);
 189         rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 190         rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 191         rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 192         seq_num = le16_to_cpu(local_rx_pd->seq_num);
 193
 194         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
 195
 196         if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 197                 dev_err(adapter->dev,
 198                         "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 199                         skb->len, rx_pkt_offset, rx_pkt_length);
 200                 priv->stats.rx_dropped++;
 201                 dev_kfree_skb_any(skb);
 202                 return ret;
 203         }
 204
 205         if (rx_pkt_type == PKT_TYPE_MGMT) {
 206                 ret = mwifiex_process_mgmt_packet(priv, skb);
 207                 if (ret)
 208                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 209                 dev_kfree_skb_any(skb);
 210                 return ret;
 211         }
 212
 213         /*
 214          * If the packet is not an unicast packet then send the packet
 215          * directly to os. Don't pass thru rx reordering
 216          */
 217         if ((!IS_11N_ENABLED(priv) &&
 218              !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 219                !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
 220             !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
 221                 mwifiex_process_rx_packet(priv, skb);
 222                 return ret;
 223         }
 224
 225         if (mwifiex_queuing_ra_based(priv) ||
 226             (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 227              local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
 228                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 229                 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
 230                     local_rx_pd->priority < MAX_NUM_TID) {
 231                         sta_ptr = mwifiex_get_sta_entry(priv, ta);
 232                         if (sta_ptr)
 233                                 sta_ptr->rx_seq[local_rx_pd->priority] =
 234                                               le16_to_cpu(local_rx_pd->seq_num);
 235                 }
 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                 dev_kfree_skb_any(skb);
 249
 250         if (ret)
 251                 priv->stats.rx_dropped++;
 252
 253         return ret;
 254 }