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- /*!
- * @file linux_mon.c
- * @brief File Operations OS wrapper functionality
- * @author mdaftedar
- * @sa wilc_wfi_netdevice.h
- * @date 01 MAR 2012
- * @version 1.0
- */
- #include "wilc_wfi_cfgoperations.h"
- #include "linux_wlan_common.h"
- #include "wilc_wlan_if.h"
- #include "wilc_wlan.h"
- struct wilc_wfi_radiotap_hdr {
- struct ieee80211_radiotap_header hdr;
- u8 rate;
- } __attribute__((packed));
- struct wilc_wfi_radiotap_cb_hdr {
- struct ieee80211_radiotap_header hdr;
- u8 rate;
- u8 dump;
- u16 tx_flags;
- } __attribute__((packed));
- static struct net_device *wilc_wfi_mon; /* global monitor netdev */
- extern int mac_xmit(struct sk_buff *skb, struct net_device *dev);
- u8 srcAdd[6];
- u8 bssid[6];
- u8 broadcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
- /**
- * @brief WILC_WFI_monitor_rx
- * @details
- * @param[in]
- * @return int : Return 0 on Success
- * @author mdaftedar
- * @date 12 JUL 2012
- * @version 1.0
- */
- #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
- #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive*/
- #define IS_MANAGMEMENT 0x100
- #define IS_MANAGMEMENT_CALLBACK 0x080
- #define IS_MGMT_STATUS_SUCCES 0x040
- #define GET_PKT_OFFSET(a) (((a) >> 22) & 0x1ff)
- void WILC_WFI_monitor_rx(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;
- PRINT_INFO(HOSTAPD_DBG, "In monitor interface receive function\n");
- if (wilc_wfi_mon == NULL)
- return;
- if (!netif_running(wilc_wfi_mon)) {
- PRINT_INFO(HOSTAPD_DBG, "Monitor interface already RUNNING\n");
- return;
- }
- /* Get WILC header */
- memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
- /* The packet offset field conain info about what type of managment frame */
- /* we are dealing with and ack status */
- pkt_offset = GET_PKT_OFFSET(header);
- if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
- /* hostapd callback mgmt frame */
- skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_cb_hdr));
- if (skb == NULL) {
- PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
- return;
- }
- memcpy(skb_put(skb, size), buff, size);
- cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *) skb_push(skb, 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(struct wilc_wfi_radiotap_cb_hdr));
- cb_hdr->hdr.it_present = cpu_to_le32(
- (1 << IEEE80211_RADIOTAP_RATE) |
- (1 << IEEE80211_RADIOTAP_TX_FLAGS));
- cb_hdr->rate = 5; /* txrate->bitrate / 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(struct wilc_wfi_radiotap_hdr));
- if (skb == NULL) {
- PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
- return;
- }
- memcpy(skb_put(skb, size), buff, size);
- hdr = (struct wilc_wfi_radiotap_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(struct wilc_wfi_radiotap_hdr));
- PRINT_INFO(HOSTAPD_DBG, "Radiotap len %d\n", hdr->hdr.it_len);
- hdr->hdr.it_present = cpu_to_le32
- (1 << IEEE80211_RADIOTAP_RATE); /* | */
- PRINT_INFO(HOSTAPD_DBG, "Presentflags %d\n", hdr->hdr.it_present);
- hdr->rate = 5; /* txrate->bitrate / 5; */
- }
- skb->dev = wilc_wfi_mon;
- skb_set_mac_header(skb, 0);
- 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 = (struct tx_complete_mon_data *)priv;
- u8 *buf = pv_data->buff;
- if (status == 1) {
- if (INFO || buf[0] == 0x10 || buf[0] == 0xb0)
- PRINT_INFO(HOSTAPD_DBG, "Packet sent successfully - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
- } else {
- PRINT_INFO(HOSTAPD_DBG, "Couldn't send packet - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
- }
- /* incase 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 == NULL) {
- PRINT_D(HOSTAPD_DBG, "ERROR: dev == NULL\n");
- return -EFAULT;
- }
- netif_stop_queue(dev);
- mgmt_tx = kmalloc(sizeof(struct tx_complete_mon_data), GFP_ATOMIC);
- if (mgmt_tx == NULL) {
- PRINT_ER("Failed to allocate memory for mgmt_tx structure\n");
- return -EFAULT;
- }
- mgmt_tx->buff = kmalloc(len, GFP_ATOMIC);
- if (mgmt_tx->buff == NULL) {
- PRINT_ER("Failed to allocate memory for mgmt_tx buff\n");
- kfree(mgmt_tx);
- return -EFAULT;
- }
- mgmt_tx->size = len;
- memcpy(mgmt_tx->buff, buf, len);
- wilc_wlan_txq_add_mgmt_pkt(mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
- mgmt_tx_complete);
- netif_wake_queue(dev);
- return 0;
- }
- /**
- * @brief WILC_WFI_mon_xmit
- * @details
- * @param[in]
- * @return int : Return 0 on Success
- * @author mdaftedar
- * @date 12 JUL 2012
- * @version 1.0
- */
- static netdev_tx_t WILC_WFI_mon_xmit(struct sk_buff *skb,
- struct net_device *dev)
- {
- u32 rtap_len, i, ret = 0;
- struct WILC_WFI_mon_priv *mon_priv;
- struct sk_buff *skb2;
- struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
- if (wilc_wfi_mon == NULL)
- return -EFAULT;
- mon_priv = netdev_priv(wilc_wfi_mon);
- if (mon_priv == NULL) {
- PRINT_ER("Monitor interface private structure is NULL\n");
- return -EFAULT;
- }
- rtap_len = ieee80211_get_radiotap_len(skb->data);
- if (skb->len < rtap_len) {
- PRINT_ER("Error in radiotap header\n");
- return -1;
- }
- /* skip the radiotap header */
- PRINT_INFO(HOSTAPD_DBG, "Radiotap len: %d\n", rtap_len);
- if (INFO) {
- for (i = 0; i < rtap_len; i++)
- PRINT_INFO(HOSTAPD_DBG, "Radiotap_hdr[%d] %02x\n", i, skb->data[i]);
- }
- /* Skip the ratio tap header */
- skb_pull(skb, rtap_len);
- if (skb->data[0] == 0xc0)
- PRINT_INFO(HOSTAPD_DBG, "%x:%x:%x:%x:%x%x\n", skb->data[4], skb->data[5], skb->data[6], skb->data[7], skb->data[8], skb->data[9]);
- if (skb->data[0] == 0xc0 && (!(memcmp(broadcast, &skb->data[4], 6)))) {
- skb2 = dev_alloc_skb(skb->len + sizeof(struct wilc_wfi_radiotap_cb_hdr));
- if (!skb2)
- return -ENOMEM;
- memcpy(skb_put(skb2, skb->len), skb->data, skb->len);
- cb_hdr = (struct wilc_wfi_radiotap_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(struct wilc_wfi_radiotap_cb_hdr));
- cb_hdr->hdr.it_present = cpu_to_le32(
- (1 << IEEE80211_RADIOTAP_RATE) |
- (1 << IEEE80211_RADIOTAP_TX_FLAGS));
- cb_hdr->rate = 5; /* txrate->bitrate / 5; */
- cb_hdr->tx_flags = 0x0004;
- skb2->dev = wilc_wfi_mon;
- skb_set_mac_header(skb2, 0);
- 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;
- PRINT_INFO(HOSTAPD_DBG, "Skipping the radiotap header\n");
- /* actual deliver of data is device-specific, and not shown here */
- PRINT_INFO(HOSTAPD_DBG, "SKB netdevice name = %s\n", skb->dev->name);
- PRINT_INFO(HOSTAPD_DBG, "MONITOR real dev name = %s\n", mon_priv->real_ndev->name);
- /* Identify if Ethernet or MAC header (data or mgmt) */
- memcpy(srcAdd, &skb->data[10], 6);
- memcpy(bssid, &skb->data[16], 6);
- /* if source address and bssid fields are equal>>Mac header */
- /*send it to mgmt frames handler */
- if (!(memcmp(srcAdd, bssid, 6))) {
- mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
- dev_kfree_skb(skb);
- } else
- ret = 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,
- };
- /**
- * @brief WILC_WFI_init_mon_interface
- * @details
- * @param[in]
- * @return int : Return 0 on Success
- * @author mdaftedar
- * @date 12 JUL 2012
- * @version 1.0
- */
- struct net_device *WILC_WFI_init_mon_interface(const char *name, struct net_device *real_dev)
- {
- u32 ret = 0;
- struct WILC_WFI_mon_priv *priv;
- /*If monitor interface is already initialized, return it*/
- if (wilc_wfi_mon) {
- return wilc_wfi_mon;
- }
- wilc_wfi_mon = alloc_etherdev(sizeof(struct WILC_WFI_mon_priv));
- if (!wilc_wfi_mon) {
- PRINT_ER("failed to allocate memory\n");
- return NULL;
- }
- wilc_wfi_mon->type = ARPHRD_IEEE80211_RADIOTAP;
- strncpy(wilc_wfi_mon->name, name, IFNAMSIZ);
- wilc_wfi_mon->name[IFNAMSIZ - 1] = 0;
- wilc_wfi_mon->netdev_ops = &wilc_wfi_netdev_ops;
- ret = register_netdevice(wilc_wfi_mon);
- if (ret) {
- PRINT_ER(" register_netdevice failed (%d)\n", ret);
- return NULL;
- }
- priv = netdev_priv(wilc_wfi_mon);
- if (priv == NULL) {
- PRINT_ER("private structure is NULL\n");
- return NULL;
- }
- priv->real_ndev = real_dev;
- return wilc_wfi_mon;
- }
- /**
- * @brief WILC_WFI_deinit_mon_interface
- * @details
- * @param[in]
- * @return int : Return 0 on Success
- * @author mdaftedar
- * @date 12 JUL 2012
- * @version 1.0
- */
- int WILC_WFI_deinit_mon_interface(void)
- {
- bool rollback_lock = false;
- if (wilc_wfi_mon != NULL) {
- PRINT_D(HOSTAPD_DBG, "In Deinit monitor interface\n");
- PRINT_D(HOSTAPD_DBG, "RTNL is being locked\n");
- if (rtnl_is_locked()) {
- rtnl_unlock();
- rollback_lock = true;
- }
- PRINT_D(HOSTAPD_DBG, "Unregister netdev\n");
- unregister_netdev(wilc_wfi_mon);
- if (rollback_lock) {
- rtnl_lock();
- rollback_lock = false;
- }
- wilc_wfi_mon = NULL;
- }
- return 0;
- }
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