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// 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");
free_netdev(wl->monitor_dev);
return NULL;
}
priv = netdev_priv(wl->monitor_dev);
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;
}
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