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         u8 adj_rx_rate = 0;
  94
  95         local_rx_pd = (struct rxpd *) (skb->data);
  96
  97         rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
  98         rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
  99         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
 100
 101         if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
 102                      sizeof(bridge_tunnel_header))) ||
 103             (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
 104                      sizeof(rfc1042_header)) &&
 105              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
 106              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
 107                 /*
 108                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
 109                  *    EthernetII header, keep the src/dst and snap_type
 110                  *    (ethertype).
 111                  *  The firmware only passes up SNAP frames converting
 112                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 113                  *  To create the Ethernet II, just move the src, dst address
 114                  *    right before the snap_type.
 115                  */
 116                 eth = (struct ethhdr *)
 117                         ((u8 *) &rx_pkt_hdr->eth803_hdr
 118                          + sizeof(rx_pkt_hdr->eth803_hdr) +
 119                          sizeof(rx_pkt_hdr->rfc1042_hdr)
 120                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 121                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 122                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 123
 124                 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 125                        sizeof(eth->h_source));
 126                 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 127                        sizeof(eth->h_dest));
 128
 129                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
 130                    header that was removed. */
 131                 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
 132         } else {
 133                 /* Chop off the rxpd */
 134                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
 135                         (u8 *) local_rx_pd;
 136         }
 137
 138         /* Chop off the leading header bytes so the it points to the start of
 139            either the reconstructed EthII frame or the 802.2/llc/snap frame */
 140         skb_pull(skb, hdr_chop);
 141
 142         if (priv->hs2_enabled &&
 143             mwifiex_discard_gratuitous_arp(priv, skb)) {
 144                 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
 145                 dev_kfree_skb_any(skb);
 146                 return 0;
 147         }
 148
 149         if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 150             ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
 151                 offset = (u8 *)local_rx_pd + rx_pkt_off;
 152                 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
 153         }
 154
 155         priv->rxpd_rate = local_rx_pd->rx_rate;
 156
 157         priv->rxpd_htinfo = local_rx_pd->ht_info;
 158
 159         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
 160             GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
 161                 adj_rx_rate = mwifiex_adjust_data_rate(priv, priv->rxpd_rate,
 162                                                        priv->rxpd_htinfo);
 163                 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
 164                                       local_rx_pd->nf);
 165         }
 166
 167         ret = mwifiex_recv_packet(priv, skb);
 168         if (ret == -1)
 169                 mwifiex_dbg(priv->adapter, ERROR,
 170                             "recv packet failed\n");
 171
 172         return ret;
 173 }
 174
 175 /*
 176  * This function processes the received buffer.
 177  *
 178  * The function looks into the RxPD and performs sanity tests on the
 179  * received buffer to ensure its a valid packet, before processing it
 180  * further. If the packet is determined to be aggregated, it is
 181  * de-aggregated accordingly. Non-unicast packets are sent directly to
 182  * the kernel/upper layers. Unicast packets are handed over to the
 183  * Rx reordering routine if 11n is enabled.
 184  *
 185  * The completion callback is called after processing in complete.
 186  */
 187 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 188                                   struct sk_buff *skb)
 189 {
 190         struct mwifiex_adapter *adapter = priv->adapter;
 191         int ret = 0;
 192         struct rxpd *local_rx_pd;
 193         struct rx_packet_hdr *rx_pkt_hdr;
 194         u8 ta[ETH_ALEN];
 195         u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 196         struct mwifiex_sta_node *sta_ptr;
 197
 198         local_rx_pd = (struct rxpd *) (skb->data);
 199         rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 200         rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 201         rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 202         seq_num = le16_to_cpu(local_rx_pd->seq_num);
 203
 204         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
 205
 206         if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 207                 mwifiex_dbg(adapter, ERROR,
 208                             "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 209                             skb->len, rx_pkt_offset, rx_pkt_length);
 210                 priv->stats.rx_dropped++;
 211                 dev_kfree_skb_any(skb);
 212                 return ret;
 213         }
 214
 215         if (rx_pkt_type == PKT_TYPE_MGMT) {
 216                 ret = mwifiex_process_mgmt_packet(priv, skb);
 217                 if (ret)
 218                         mwifiex_dbg(adapter, ERROR, "Rx of mgmt packet failed");
 219                 dev_kfree_skb_any(skb);
 220                 return ret;
 221         }
 222
 223         /*
 224          * If the packet is not an unicast packet then send the packet
 225          * directly to os. Don't pass thru rx reordering
 226          */
 227         if ((!IS_11N_ENABLED(priv) &&
 228              !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 229                !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
 230             !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
 231                 mwifiex_process_rx_packet(priv, skb);
 232                 return ret;
 233         }
 234
 235         if (mwifiex_queuing_ra_based(priv) ||
 236             (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 237              local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
 238                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 239                 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
 240                     local_rx_pd->priority < MAX_NUM_TID) {
 241                         sta_ptr = mwifiex_get_sta_entry(priv, ta);
 242                         if (sta_ptr)
 243                                 sta_ptr->rx_seq[local_rx_pd->priority] =
 244                                               le16_to_cpu(local_rx_pd->seq_num);
 245                         mwifiex_auto_tdls_update_peer_signal(priv, ta,
 246                                                              local_rx_pd->snr,
 247                                                              local_rx_pd->nf);
 248                 }
 249         } else {
 250                 if (rx_pkt_type != PKT_TYPE_BAR)
 251                         priv->rx_seq[local_rx_pd->priority] = seq_num;
 252                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 253                        ETH_ALEN);
 254         }
 255
 256         /* Reorder and send to OS */
 257         ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
 258                                          ta, (u8) rx_pkt_type, skb);
 259
 260         if (ret || (rx_pkt_type == PKT_TYPE_BAR))
 261                 dev_kfree_skb_any(skb);
 262
 263         if (ret)
 264                 priv->stats.rx_dropped++;
 265
 266         return ret;
 267 }