drivers/staging/wilc1000/wilc_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 #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         memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
  39         le32_to_cpus(&header);
  40         /*
  41          * The packet offset field contain info about what type of management
  42          * the frame we are dealing with and ack status
  43          */
  44         pkt_offset = GET_PKT_OFFSET(header);
  45
  46         if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
  47                 /* hostapd callback mgmt frame */
  48
  49                 skb = dev_alloc_skb(size + sizeof(*cb_hdr));
  50                 if (!skb)
  51                         return;
  52
  53                 skb_put_data(skb, buff, size);
  54
  55                 cb_hdr = skb_push(skb, sizeof(*cb_hdr));
  56                 memset(cb_hdr, 0, sizeof(*cb_hdr));
  57
  58                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  59
  60                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
  61
  62                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
  63
  64                 cb_hdr->rate = 5;
  65
  66                 if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
  67                         /* success */
  68                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
  69                 } else {
  70                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
  71                 }
  72
  73         } else {
  74                 skb = dev_alloc_skb(size + sizeof(*hdr));
  75
  76                 if (!skb)
  77                         return;
  78
  79                 skb_put_data(skb, buff, size);
  80                 hdr = skb_push(skb, sizeof(*hdr));
  81                 memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
  82                 hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  83                 hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
  84                 hdr->hdr.it_present = cpu_to_le32
  85                                 (1 << IEEE80211_RADIOTAP_RATE);
  86                 hdr->rate = 5;
  87         }
  88
  89         skb->dev = mon_dev;
  90         skb_reset_mac_header(skb);
  91         skb->ip_summed = CHECKSUM_UNNECESSARY;
  92         skb->pkt_type = PACKET_OTHERHOST;
  93         skb->protocol = htons(ETH_P_802_2);
  94         memset(skb->cb, 0, sizeof(skb->cb));
  95
  96         netif_rx(skb);
  97 }
  98
  99 struct tx_complete_mon_data {
 100         int size;
 101         void *buff;
 102 };
 103
 104 static void mgmt_tx_complete(void *priv, int status)
 105 {
 106         struct tx_complete_mon_data *pv_data = priv;
 107         /*
 108          * in case of fully hosting mode, the freeing will be done
 109          * in response to the cfg packet
 110          */
 111         kfree(pv_data->buff);
 112
 113         kfree(pv_data);
 114 }
 115
 116 static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
 117 {
 118         struct tx_complete_mon_data *mgmt_tx = NULL;
 119
 120         if (!dev)
 121                 return -EFAULT;
 122
 123         netif_stop_queue(dev);
 124         mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
 125         if (!mgmt_tx)
 126                 return -ENOMEM;
 127
 128         mgmt_tx->buff = kmemdup(buf, len, GFP_ATOMIC);
 129         if (!mgmt_tx->buff) {
 130                 kfree(mgmt_tx);
 131                 return -ENOMEM;
 132         }
 133
 134         mgmt_tx->size = len;
 135
 136         wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
 137                                    mgmt_tx_complete);
 138
 139         netif_wake_queue(dev);
 140         return 0;
 141 }
 142
 143 static netdev_tx_t wilc_wfi_mon_xmit(struct sk_buff *skb,
 144                                      struct net_device *dev)
 145 {
 146         u32 rtap_len, ret = 0;
 147         struct wilc_wfi_mon_priv  *mon_priv;
 148         struct sk_buff *skb2;
 149         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
 150         u8 srcadd[ETH_ALEN];
 151         u8 bssid[ETH_ALEN];
 152
 153         mon_priv = netdev_priv(dev);
 154         if (!mon_priv)
 155                 return -EFAULT;
 156
 157         rtap_len = ieee80211_get_radiotap_len(skb->data);
 158         if (skb->len < rtap_len)
 159                 return -1;
 160
 161         skb_pull(skb, rtap_len);
 162
 163         if (skb->data[0] == 0xc0 && is_broadcast_ether_addr(&skb->data[4])) {
 164                 skb2 = dev_alloc_skb(skb->len + sizeof(*cb_hdr));
 165                 if (!skb2)
 166                         return -ENOMEM;
 167
 168                 skb_put_data(skb2, skb->data, skb->len);
 169
 170                 cb_hdr = skb_push(skb2, sizeof(*cb_hdr));
 171                 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
 172
 173                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
 174
 175                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr));
 176
 177                 cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT);
 178
 179                 cb_hdr->rate = 5;
 180                 cb_hdr->tx_flags = 0x0004;
 181
 182                 skb2->dev = dev;
 183                 skb_reset_mac_header(skb2);
 184                 skb2->ip_summed = CHECKSUM_UNNECESSARY;
 185                 skb2->pkt_type = PACKET_OTHERHOST;
 186                 skb2->protocol = htons(ETH_P_802_2);
 187                 memset(skb2->cb, 0, sizeof(skb2->cb));
 188
 189                 netif_rx(skb2);
 190
 191                 return 0;
 192         }
 193         skb->dev = mon_priv->real_ndev;
 194
 195         ether_addr_copy(srcadd, &skb->data[10]);
 196         ether_addr_copy(bssid, &skb->data[16]);
 197         /*
 198          * Identify if data or mgmt packet, if source address and bssid
 199          * fields are equal send it to mgmt frames handler
 200          */
 201         if (!(memcmp(srcadd, bssid, 6))) {
 202                 ret = mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
 203                 if (ret)
 204                         netdev_err(dev, "fail to mgmt tx\n");
 205                 dev_kfree_skb(skb);
 206         } else {
 207                 ret = wilc_mac_xmit(skb, mon_priv->real_ndev);
 208         }
 209
 210         return ret;
 211 }
 212
 213 static const struct net_device_ops wilc_wfi_netdev_ops = {
 214         .ndo_start_xmit         = wilc_wfi_mon_xmit,
 215
 216 };
 217
 218 struct net_device *wilc_wfi_init_mon_interface(struct wilc *wl,
 219                                                const char *name,
 220                                                struct net_device *real_dev)
 221 {
 222         struct wilc_wfi_mon_priv *priv;
 223
 224         /*If monitor interface is already initialized, return it*/
 225         if (wl->monitor_dev)
 226                 return wl->monitor_dev;
 227
 228         wl->monitor_dev = alloc_etherdev(sizeof(struct wilc_wfi_mon_priv));
 229         if (!wl->monitor_dev)
 230                 return NULL;
 231
 232         wl->monitor_dev->type = ARPHRD_IEEE80211_RADIOTAP;
 233         strncpy(wl->monitor_dev->name, name, IFNAMSIZ);
 234         wl->monitor_dev->name[IFNAMSIZ - 1] = 0;
 235         wl->monitor_dev->netdev_ops = &wilc_wfi_netdev_ops;
 236         wl->monitor_dev->needs_free_netdev = true;
 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, bool rtnl_locked)
 252 {
 253         if (!wl->monitor_dev)
 254                 return;
 255
 256         if (rtnl_locked)
 257                 unregister_netdevice(wl->monitor_dev);
 258         else
 259                 unregister_netdev(wl->monitor_dev);
 260         wl->monitor_dev = NULL;
 261 }