drivers/net/wireless/microchip/wilc1000/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 "cfg80211.h"
   8
   9 struct wilc_wfi_radiotap_hdr {
  10         struct ieee80211_radiotap_header_fixed hdr;
  11         u8 rate;
  12 } __packed;
  13
  14 struct wilc_wfi_radiotap_cb_hdr {
  15         struct ieee80211_radiotap_header_fixed hdr;
  16         u8 rate;
  17         u8 dump;
  18         u16 tx_flags;
  19 } __packed;
  20
  21 #define TX_RADIOTAP_PRESENT ((1 << IEEE80211_RADIOTAP_RATE) |   \
  22                              (1 << IEEE80211_RADIOTAP_TX_FLAGS))
  23
  24 void wilc_wfi_monitor_rx(struct net_device *mon_dev, u8 *buff, u32 size)
  25 {
  26         u32 header, pkt_offset;
  27         struct sk_buff *skb = NULL;
  28         struct wilc_wfi_radiotap_hdr *hdr;
  29         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
  30
  31         if (!mon_dev)
  32                 return;
  33
  34         if (!netif_running(mon_dev))
  35                 return;
  36
  37         /* Get WILC header */
  38         header = get_unaligned_le32(buff - HOST_HDR_OFFSET);
  39         /*
  40          * The packet offset field contain info about what type of management
  41          * the frame we are dealing with and ack status
  42          */
  43         pkt_offset = FIELD_GET(WILC_PKT_HDR_OFFSET_FIELD, header);
  44
  45         if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
  46                 /* hostapd callback mgmt frame */
  47
  48                 skb = dev_alloc_skb(size + sizeof(*cb_hdr));
  49                 if (!skb)
  50                         return;
  51
  52                 skb_put_data(skb, buff, size);
  53
  54                 cb_hdr = skb_push(skb, sizeof(*cb_hdr));
  55                 memset(cb_hdr, 0, sizeof(*cb_hdr));
  56
  57                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  58
  59                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
  60
  61                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
  62
  63                 cb_hdr->rate = 5;
  64
  65                 if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
  66                         /* success */
  67                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
  68                 } else {
  69                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
  70                 }
  71
  72         } else {
  73                 skb = dev_alloc_skb(size + sizeof(*hdr));
  74
  75                 if (!skb)
  76                         return;
  77
  78                 skb_put_data(skb, buff, size);
  79                 hdr = skb_push(skb, sizeof(*hdr));
  80                 memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
  81                 hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  82                 hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
  83                 hdr->hdr.it_present = cpu_to_le32
  84                                 (1 << IEEE80211_RADIOTAP_RATE);
  85                 hdr->rate = 5;
  86         }
  87
  88         skb->dev = mon_dev;
  89         skb_reset_mac_header(skb);
  90         skb->ip_summed = CHECKSUM_UNNECESSARY;
  91         skb->pkt_type = PACKET_OTHERHOST;
  92         skb->protocol = htons(ETH_P_802_2);
  93         memset(skb->cb, 0, sizeof(skb->cb));
  94
  95         netif_rx(skb);
  96 }
  97
  98 struct tx_complete_mon_data {
  99         int size;
 100         void *buff;
 101 };
 102
 103 static void mgmt_tx_complete(void *priv, int status)
 104 {
 105         struct tx_complete_mon_data *pv_data = priv;
 106         /*
 107          * in case of fully hosting mode, the freeing will be done
 108          * in response to the cfg packet
 109          */
 110         kfree(pv_data->buff);
 111
 112         kfree(pv_data);
 113 }
 114
 115 static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
 116 {
 117         struct tx_complete_mon_data *mgmt_tx = NULL;
 118
 119         if (!dev)
 120                 return -EFAULT;
 121
 122         netif_stop_queue(dev);
 123         mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
 124         if (!mgmt_tx)
 125                 return -ENOMEM;
 126
 127         mgmt_tx->buff = kmemdup(buf, len, GFP_ATOMIC);
 128         if (!mgmt_tx->buff) {
 129                 kfree(mgmt_tx);
 130                 return -ENOMEM;
 131         }
 132
 133         mgmt_tx->size = len;
 134
 135         wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
 136                                    mgmt_tx_complete);
 137
 138         netif_wake_queue(dev);
 139         return 0;
 140 }
 141
 142 static netdev_tx_t wilc_wfi_mon_xmit(struct sk_buff *skb,
 143                                      struct net_device *dev)
 144 {
 145         u32 rtap_len, ret = 0;
 146         struct wilc_wfi_mon_priv  *mon_priv;
 147         struct sk_buff *skb2;
 148         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
 149         u8 srcadd[ETH_ALEN];
 150         u8 bssid[ETH_ALEN];
 151
 152         mon_priv = netdev_priv(dev);
 153         if (!mon_priv)
 154                 return -EFAULT;
 155
 156         rtap_len = ieee80211_get_radiotap_len(skb->data);
 157         if (skb->len < rtap_len)
 158                 return -1;
 159
 160         skb_pull(skb, rtap_len);
 161
 162         if (skb->data[0] == 0xc0 && is_broadcast_ether_addr(&skb->data[4])) {
 163                 skb2 = dev_alloc_skb(skb->len + sizeof(*cb_hdr));
 164                 if (!skb2)
 165                         return -ENOMEM;
 166
 167                 skb_put_data(skb2, skb->data, skb->len);
 168
 169                 cb_hdr = skb_push(skb2, sizeof(*cb_hdr));
 170                 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
 171
 172                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
 173
 174                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
 175
 176                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
 177
 178                 cb_hdr->rate = 5;
 179                 cb_hdr->tx_flags = 0x0004;
 180
 181                 skb2->dev = dev;
 182                 skb_reset_mac_header(skb2);
 183                 skb2->ip_summed = CHECKSUM_UNNECESSARY;
 184                 skb2->pkt_type = PACKET_OTHERHOST;
 185                 skb2->protocol = htons(ETH_P_802_2);
 186                 memset(skb2->cb, 0, sizeof(skb2->cb));
 187
 188                 netif_rx(skb2);
 189
 190                 return 0;
 191         }
 192         skb->dev = mon_priv->real_ndev;
 193
 194         ether_addr_copy(srcadd, &skb->data[10]);
 195         ether_addr_copy(bssid, &skb->data[16]);
 196         /*
 197          * Identify if data or mgmt packet, if source address and bssid
 198          * fields are equal send it to mgmt frames handler
 199          */
 200         if (!(memcmp(srcadd, bssid, 6))) {
 201                 ret = mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
 202                 if (ret)
 203                         netdev_err(dev, "fail to mgmt tx\n");
 204                 dev_kfree_skb(skb);
 205         } else {
 206                 ret = wilc_mac_xmit(skb, mon_priv->real_ndev);
 207         }
 208
 209         return ret;
 210 }
 211
 212 static const struct net_device_ops wilc_wfi_netdev_ops = {
 213         .ndo_start_xmit         = wilc_wfi_mon_xmit,
 214
 215 };
 216
 217 struct net_device *wilc_wfi_init_mon_interface(struct wilc *wl,
 218                                                const char *name,
 219                                                struct net_device *real_dev)
 220 {
 221         struct wilc_wfi_mon_priv *priv;
 222
 223         /* If monitor interface is already initialized, return it */
 224         if (wl->monitor_dev)
 225                 return wl->monitor_dev;
 226
 227         wl->monitor_dev = alloc_etherdev(sizeof(struct wilc_wfi_mon_priv));
 228         if (!wl->monitor_dev)
 229                 return NULL;
 230
 231         wl->monitor_dev->type = ARPHRD_IEEE80211_RADIOTAP;
 232         strscpy(wl->monitor_dev->name, name, IFNAMSIZ);
 233         wl->monitor_dev->netdev_ops = &wilc_wfi_netdev_ops;
 234         wl->monitor_dev->needs_free_netdev = true;
 235
 236         if (register_netdevice(wl->monitor_dev)) {
 237                 netdev_err(real_dev, "register_netdevice failed\n");
 238                 free_netdev(wl->monitor_dev);
 239                 return NULL;
 240         }
 241         priv = netdev_priv(wl->monitor_dev);
 242
 243         priv->real_ndev = real_dev;
 244
 245         return wl->monitor_dev;
 246 }
 247
 248 void wilc_wfi_deinit_mon_interface(struct wilc *wl, bool rtnl_locked)
 249 {
 250         if (!wl->monitor_dev)
 251                 return;
 252
 253         if (rtnl_locked)
 254                 unregister_netdevice(wl->monitor_dev);
 255         else
 256                 unregister_netdev(wl->monitor_dev);
 257         wl->monitor_dev = NULL;
 258 }