diff options
Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/mon.c')
| -rw-r--r-- | drivers/net/wireless/microchip/wilc1000/mon.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/mon.c b/drivers/net/wireless/microchip/wilc1000/mon.c new file mode 100644 index 000000000000..358ac8601333 --- /dev/null +++ b/drivers/net/wireless/microchip/wilc1000/mon.c @@ -0,0 +1,259 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiaries. + * All rights reserved. + */ + +#include "cfg80211.h" + +struct wilc_wfi_radiotap_hdr { + struct ieee80211_radiotap_header hdr; + u8 rate; +} __packed; + +struct wilc_wfi_radiotap_cb_hdr { + struct ieee80211_radiotap_header hdr; + u8 rate; + u8 dump; + u16 tx_flags; +} __packed; + +#define TX_RADIOTAP_PRESENT ((1 << IEEE80211_RADIOTAP_RATE) | \ + (1 << IEEE80211_RADIOTAP_TX_FLAGS)) + +void wilc_wfi_monitor_rx(struct net_device *mon_dev, u8 *buff, u32 size) +{ + u32 header, pkt_offset; + struct sk_buff *skb = NULL; + struct wilc_wfi_radiotap_hdr *hdr; + struct wilc_wfi_radiotap_cb_hdr *cb_hdr; + + if (!mon_dev) + return; + + if (!netif_running(mon_dev)) + return; + + /* Get WILC header */ + header = get_unaligned_le32(buff - HOST_HDR_OFFSET); + /* + * The packet offset field contain info about what type of management + * the frame we are dealing with and ack status + */ + pkt_offset = FIELD_GET(WILC_PKT_HDR_OFFSET_FIELD, header); + + if (pkt_offset & IS_MANAGMEMENT_CALLBACK) { + /* hostapd callback mgmt frame */ + + skb = dev_alloc_skb(size + sizeof(*cb_hdr)); + if (!skb) + return; + + skb_put_data(skb, buff, size); + + cb_hdr = skb_push(skb, sizeof(*cb_hdr)); + memset(cb_hdr, 0, sizeof(*cb_hdr)); + + cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */ + + cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr)); + + cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT); + + cb_hdr->rate = 5; + + if (pkt_offset & IS_MGMT_STATUS_SUCCES) { + /* success */ + cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS; + } else { + cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL; + } + + } else { + skb = dev_alloc_skb(size + sizeof(*hdr)); + + if (!skb) + return; + + skb_put_data(skb, buff, size); + hdr = skb_push(skb, sizeof(*hdr)); + memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr)); + hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */ + hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr)); + hdr->hdr.it_present = cpu_to_le32 + (1 << IEEE80211_RADIOTAP_RATE); + hdr->rate = 5; + } + + skb->dev = mon_dev; + skb_reset_mac_header(skb); + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->pkt_type = PACKET_OTHERHOST; + skb->protocol = htons(ETH_P_802_2); + memset(skb->cb, 0, sizeof(skb->cb)); + + netif_rx(skb); +} + +struct tx_complete_mon_data { + int size; + void *buff; +}; + +static void mgmt_tx_complete(void *priv, int status) +{ + struct tx_complete_mon_data *pv_data = priv; + /* + * in case of fully hosting mode, the freeing will be done + * in response to the cfg packet + */ + kfree(pv_data->buff); + + kfree(pv_data); +} + +static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len) +{ + struct tx_complete_mon_data *mgmt_tx = NULL; + + if (!dev) + return -EFAULT; + + netif_stop_queue(dev); + mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC); + if (!mgmt_tx) + return -ENOMEM; + + mgmt_tx->buff = kmemdup(buf, len, GFP_ATOMIC); + if (!mgmt_tx->buff) { + kfree(mgmt_tx); + return -ENOMEM; + } + + mgmt_tx->size = len; + + wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size, + mgmt_tx_complete); + + netif_wake_queue(dev); + return 0; +} + +static netdev_tx_t wilc_wfi_mon_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + u32 rtap_len, ret = 0; + struct wilc_wfi_mon_priv *mon_priv; + struct sk_buff *skb2; + struct wilc_wfi_radiotap_cb_hdr *cb_hdr; + u8 srcadd[ETH_ALEN]; + u8 bssid[ETH_ALEN]; + + mon_priv = netdev_priv(dev); + if (!mon_priv) + return -EFAULT; + + rtap_len = ieee80211_get_radiotap_len(skb->data); + if (skb->len < rtap_len) + return -1; + + skb_pull(skb, rtap_len); + + if (skb->data[0] == 0xc0 && is_broadcast_ether_addr(&skb->data[4])) { + skb2 = dev_alloc_skb(skb->len + sizeof(*cb_hdr)); + if (!skb2) + return -ENOMEM; + + skb_put_data(skb2, skb->data, skb->len); + + cb_hdr = skb_push(skb2, sizeof(*cb_hdr)); + memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr)); + + cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */ + + cb_hdr->hdr.it_len = cpu_to_le16(sizeof(*cb_hdr)); + + cb_hdr->hdr.it_present = cpu_to_le32(TX_RADIOTAP_PRESENT); + + cb_hdr->rate = 5; + cb_hdr->tx_flags = 0x0004; + + skb2->dev = dev; + skb_reset_mac_header(skb2); + skb2->ip_summed = CHECKSUM_UNNECESSARY; + skb2->pkt_type = PACKET_OTHERHOST; + skb2->protocol = htons(ETH_P_802_2); + memset(skb2->cb, 0, sizeof(skb2->cb)); + + netif_rx(skb2); + + return 0; + } + skb->dev = mon_priv->real_ndev; + + ether_addr_copy(srcadd, &skb->data[10]); + ether_addr_copy(bssid, &skb->data[16]); + /* + * Identify if data or mgmt packet, if source address and bssid + * fields are equal send it to mgmt frames handler + */ + if (!(memcmp(srcadd, bssid, 6))) { + ret = mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len); + if (ret) + netdev_err(dev, "fail to mgmt tx\n"); + dev_kfree_skb(skb); + } else { + ret = wilc_mac_xmit(skb, mon_priv->real_ndev); + } + + return ret; +} + +static const struct net_device_ops wilc_wfi_netdev_ops = { + .ndo_start_xmit = wilc_wfi_mon_xmit, + +}; + +struct net_device *wilc_wfi_init_mon_interface(struct wilc *wl, + const char *name, + struct net_device *real_dev) +{ + struct wilc_wfi_mon_priv *priv; + + /* If monitor interface is already initialized, return it */ + if (wl->monitor_dev) + return wl->monitor_dev; + + wl->monitor_dev = alloc_etherdev(sizeof(struct wilc_wfi_mon_priv)); + if (!wl->monitor_dev) + return NULL; + + wl->monitor_dev->type = ARPHRD_IEEE80211_RADIOTAP; + strlcpy(wl->monitor_dev->name, name, IFNAMSIZ); + wl->monitor_dev->netdev_ops = &wilc_wfi_netdev_ops; + wl->monitor_dev->needs_free_netdev = true; + + if (register_netdevice(wl->monitor_dev)) { + netdev_err(real_dev, "register_netdevice failed\n"); + return NULL; + } + priv = netdev_priv(wl->monitor_dev); + if (!priv) + return NULL; + + priv->real_ndev = real_dev; + + return wl->monitor_dev; +} + +void wilc_wfi_deinit_mon_interface(struct wilc *wl, bool rtnl_locked) +{ + if (!wl->monitor_dev) + return; + + if (rtnl_locked) + unregister_netdevice(wl->monitor_dev); + else + unregister_netdev(wl->monitor_dev); + wl->monitor_dev = NULL; +} |