drivers/staging/wilc1000/linux_mon.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiaries.
   4  * All rights reserved.
   5  */
   6
   7 #include "wilc_wfi_cfgoperations.h"
   8
   9 struct wilc_wfi_radiotap_hdr {
  10         struct ieee80211_radiotap_header hdr;
  11         u8 rate;
  12 } __packed;
  13
  14 struct wilc_wfi_radiotap_cb_hdr {
  15         struct ieee80211_radiotap_header hdr;
  16         u8 rate;
  17         u8 dump;
  18         u16 tx_flags;
  19 } __packed;
  20
  21 static u8 srcadd[6];
  22 static u8 bssid[6];
  23
  24 #define TX_RADIOTAP_PRESENT ((1 << IEEE80211_RADIOTAP_RATE) |   \
  25                              (1 << IEEE80211_RADIOTAP_TX_FLAGS))
  26
  27 void wilc_wfi_monitor_rx(struct net_device *mon_dev, u8 *buff, u32 size)
  28 {
  29         u32 header, pkt_offset;
  30         struct sk_buff *skb = NULL;
  31         struct wilc_wfi_radiotap_hdr *hdr;
  32         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
  33
  34         if (!mon_dev)
  35                 return;
  36
  37         if (!netif_running(mon_dev))
  38                 return;
  39
  40         /* Get WILC header */
  41         memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
  42         le32_to_cpus(&header);
  43         /*
  44          * The packet offset field contain info about what type of management
  45          * the frame we are dealing with and ack status
  46          */
  47         pkt_offset = GET_PKT_OFFSET(header);
  48
  49         if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
  50                 /* hostapd callback mgmt frame */
  51
  52                 skb = dev_alloc_skb(size + sizeof(*cb_hdr));
  53                 if (!skb)
  54                         return;
  55
  56                 skb_put_data(skb, buff, size);
  57
  58                 cb_hdr = skb_push(skb, sizeof(*cb_hdr));
  59                 memset(cb_hdr, 0, sizeof(*cb_hdr));
  60
  61                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  62
  63                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
  64
  65                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
  66
  67                 cb_hdr->rate = 5;
  68
  69                 if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
  70                         /* success */
  71                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
  72                 } else {
  73                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
  74                 }
  75
  76         } else {
  77                 skb = dev_alloc_skb(size + sizeof(*hdr));
  78
  79                 if (!skb)
  80                         return;
  81
  82                 skb_put_data(skb, buff, size);
  83                 hdr = skb_push(skb, sizeof(*hdr));
  84                 memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
  85                 hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  86                 hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
  87                 hdr->hdr.it_present = cpu_to_le32
  88                                 (1 << IEEE80211_RADIOTAP_RATE);
  89                 hdr->rate = 5;
  90         }
  91
  92         skb->dev = mon_dev;
  93         skb_reset_mac_header(skb);
  94         skb->ip_summed = CHECKSUM_UNNECESSARY;
  95         skb->pkt_type = PACKET_OTHERHOST;
  96         skb->protocol = htons(ETH_P_802_2);
  97         memset(skb->cb, 0, sizeof(skb->cb));
  98
  99         netif_rx(skb);
 100 }
 101
 102 struct tx_complete_mon_data {
 103         int size;
 104         void *buff;
 105 };
 106
 107 static void mgmt_tx_complete(void *priv, int status)
 108 {
 109         struct tx_complete_mon_data *pv_data = priv;
 110         /*
 111          * in case of fully hosting mode, the freeing will be done
 112          * in response to the cfg packet
 113          */
 114         kfree(pv_data->buff);
 115
 116         kfree(pv_data);
 117 }
 118
 119 static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
 120 {
 121         struct tx_complete_mon_data *mgmt_tx = NULL;
 122
 123         if (!dev)
 124                 return -EFAULT;
 125
 126         netif_stop_queue(dev);
 127         mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
 128         if (!mgmt_tx)
 129                 return -ENOMEM;
 130
 131         mgmt_tx->buff = kmemdup(buf, len, GFP_ATOMIC);
 132         if (!mgmt_tx->buff) {
 133                 kfree(mgmt_tx);
 134                 return -ENOMEM;
 135         }
 136
 137         mgmt_tx->size = len;
 138
 139         wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
 140                                    mgmt_tx_complete);
 141
 142         netif_wake_queue(dev);
 143         return 0;
 144 }
 145
 146 static netdev_tx_t wilc_wfi_mon_xmit(struct sk_buff *skb,
 147                                      struct net_device *dev)
 148 {
 149         u32 rtap_len, ret = 0;
 150         struct wilc_wfi_mon_priv  *mon_priv;
 151         struct sk_buff *skb2;
 152         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
 153
 154         mon_priv = netdev_priv(dev);
 155         if (!mon_priv)
 156                 return -EFAULT;
 157
 158         rtap_len = ieee80211_get_radiotap_len(skb->data);
 159         if (skb->len < rtap_len)
 160                 return -1;
 161
 162         skb_pull(skb, rtap_len);
 163
 164         if (skb->data[0] == 0xc0 && is_broadcast_ether_addr(&skb->data[4])) {
 165                 skb2 = dev_alloc_skb(skb->len + sizeof(*cb_hdr));
 166                 if (!skb2)
 167                         return -ENOMEM;
 168
 169                 skb_put_data(skb2, skb->data, skb->len);
 170
 171                 cb_hdr = skb_push(skb2, sizeof(*cb_hdr));
 172                 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
 173
 174                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
 175
 176                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
 177
 178                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
 179
 180                 cb_hdr->rate = 5;
 181                 cb_hdr->tx_flags = 0x0004;
 182
 183                 skb2->dev = dev;
 184                 skb_reset_mac_header(skb2);
 185                 skb2->ip_summed = CHECKSUM_UNNECESSARY;
 186                 skb2->pkt_type = PACKET_OTHERHOST;
 187                 skb2->protocol = htons(ETH_P_802_2);
 188                 memset(skb2->cb, 0, sizeof(skb2->cb));
 189
 190                 netif_rx(skb2);
 191
 192                 return 0;
 193         }
 194         skb->dev = mon_priv->real_ndev;
 195
 196         memcpy(srcadd, &skb->data[10], 6);
 197         memcpy(bssid, &skb->data[16], 6);
 198         /*
 199          * Identify if data or mgmt packet, if source address and bssid
 200          * fields are equal send it to mgmt frames handler
 201          */
 202         if (!(memcmp(srcadd, bssid, 6))) {
 203                 ret = mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
 204                 if (ret)
 205                         netdev_err(dev, "fail to mgmt tx\n");
 206                 dev_kfree_skb(skb);
 207         } else {
 208                 ret = wilc_mac_xmit(skb, mon_priv->real_ndev);
 209         }
 210
 211         return ret;
 212 }
 213
 214 static const struct net_device_ops wilc_wfi_netdev_ops = {
 215         .ndo_start_xmit         = wilc_wfi_mon_xmit,
 216
 217 };
 218
 219 struct net_device *wilc_wfi_init_mon_interface(struct wilc *wl,
 220                                                const char *name,
 221                                                struct net_device *real_dev)
 222 {
 223         struct wilc_wfi_mon_priv *priv;
 224
 225         /*If monitor interface is already initialized, return it*/
 226         if (wl->monitor_dev)
 227                 return wl->monitor_dev;
 228
 229         wl->monitor_dev = alloc_etherdev(sizeof(struct wilc_wfi_mon_priv));
 230         if (!wl->monitor_dev)
 231                 return NULL;
 232
 233         wl->monitor_dev->type = ARPHRD_IEEE80211_RADIOTAP;
 234         strncpy(wl->monitor_dev->name, name, IFNAMSIZ);
 235         wl->monitor_dev->name[IFNAMSIZ - 1] = 0;
 236         wl->monitor_dev->netdev_ops = &wilc_wfi_netdev_ops;
 237
 238         if (register_netdevice(wl->monitor_dev)) {
 239                 netdev_err(real_dev, "register_netdevice failed\n");
 240                 return NULL;
 241         }
 242         priv = netdev_priv(wl->monitor_dev);
 243         if (!priv)
 244                 return NULL;
 245
 246         priv->real_ndev = real_dev;
 247
 248         return wl->monitor_dev;
 249 }
 250
 251 void wilc_wfi_deinit_mon_interface(struct wilc *wl)
 252 {
 253         if (!wl->monitor_dev)
 254                 return;
 255
 256         unregister_netdev(wl->monitor_dev);
 257         free_netdev(wl->monitor_dev);
 258         wl->monitor_dev = NULL;
 259 }