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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Zhang Shengju](/assets/img/avatar_default.png)
Since offset is zero, it's not necessary to use set function. Reset function is straightforward, and will remove the unnecessary add operation in set function. Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
320 lines
7.6 KiB
C
320 lines
7.6 KiB
C
/*!
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* @file linux_mon.c
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* @brief File Operations OS wrapper functionality
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* @author mdaftedar
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* @sa wilc_wfi_netdevice.h
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* @date 01 MAR 2012
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* @version 1.0
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*/
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#include "wilc_wfi_cfgoperations.h"
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#include "wilc_wlan_if.h"
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#include "wilc_wlan.h"
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struct wilc_wfi_radiotap_hdr {
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struct ieee80211_radiotap_header hdr;
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u8 rate;
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} __packed;
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struct wilc_wfi_radiotap_cb_hdr {
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struct ieee80211_radiotap_header hdr;
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u8 rate;
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u8 dump;
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u16 tx_flags;
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} __packed;
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static struct net_device *wilc_wfi_mon; /* global monitor netdev */
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static u8 srcadd[6];
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static u8 bssid[6];
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static u8 broadcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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/**
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* @brief WILC_WFI_monitor_rx
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* @details
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* @param[in]
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* @return int : Return 0 on Success
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* @author mdaftedar
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* @date 12 JUL 2012
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* @version 1.0
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*/
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#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
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#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive*/
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#define IS_MANAGMEMENT 0x100
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#define IS_MANAGMEMENT_CALLBACK 0x080
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#define IS_MGMT_STATUS_SUCCES 0x040
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#define GET_PKT_OFFSET(a) (((a) >> 22) & 0x1ff)
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void WILC_WFI_monitor_rx(u8 *buff, u32 size)
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{
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u32 header, pkt_offset;
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struct sk_buff *skb = NULL;
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struct wilc_wfi_radiotap_hdr *hdr;
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struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
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if (!wilc_wfi_mon)
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return;
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if (!netif_running(wilc_wfi_mon))
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return;
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/* Get WILC header */
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memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
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/*
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* The packet offset field contain info about what type of management
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* the frame we are dealing with and ack status
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*/
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pkt_offset = GET_PKT_OFFSET(header);
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if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
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/* hostapd callback mgmt frame */
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skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_cb_hdr));
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if (!skb)
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return;
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memcpy(skb_put(skb, size), buff, size);
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cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *)skb_push(skb, sizeof(*cb_hdr));
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memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
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cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
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cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
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cb_hdr->hdr.it_present = cpu_to_le32(
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(1 << IEEE80211_RADIOTAP_RATE) |
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(1 << IEEE80211_RADIOTAP_TX_FLAGS));
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cb_hdr->rate = 5; /* txrate->bitrate / 5; */
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if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
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/* success */
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cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
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} else {
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cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
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}
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} else {
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skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_hdr));
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if (!skb)
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return;
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memcpy(skb_put(skb, size), buff, size);
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hdr = (struct wilc_wfi_radiotap_hdr *)skb_push(skb, sizeof(*hdr));
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memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
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hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
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hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_hdr));
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hdr->hdr.it_present = cpu_to_le32
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(1 << IEEE80211_RADIOTAP_RATE); /* | */
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hdr->rate = 5; /* txrate->bitrate / 5; */
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}
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skb->dev = wilc_wfi_mon;
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skb_reset_mac_header(skb);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = htons(ETH_P_802_2);
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memset(skb->cb, 0, sizeof(skb->cb));
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netif_rx(skb);
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}
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struct tx_complete_mon_data {
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int size;
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void *buff;
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};
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static void mgmt_tx_complete(void *priv, int status)
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{
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struct tx_complete_mon_data *pv_data = priv;
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/*
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* in case of fully hosting mode, the freeing will be done
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* in response to the cfg packet
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*/
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kfree(pv_data->buff);
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kfree(pv_data);
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}
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static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
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{
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struct tx_complete_mon_data *mgmt_tx = NULL;
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if (!dev)
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return -EFAULT;
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netif_stop_queue(dev);
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mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
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if (!mgmt_tx)
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return -ENOMEM;
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mgmt_tx->buff = kmalloc(len, GFP_ATOMIC);
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if (!mgmt_tx->buff) {
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kfree(mgmt_tx);
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return -ENOMEM;
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}
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mgmt_tx->size = len;
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memcpy(mgmt_tx->buff, buf, len);
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wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
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mgmt_tx_complete);
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netif_wake_queue(dev);
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return 0;
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}
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/**
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* @brief WILC_WFI_mon_xmit
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* @details
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* @param[in]
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* @return int : Return 0 on Success
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* @author mdaftedar
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* @date 12 JUL 2012
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* @version 1.0
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*/
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static netdev_tx_t WILC_WFI_mon_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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u32 rtap_len, ret = 0;
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struct WILC_WFI_mon_priv *mon_priv;
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struct sk_buff *skb2;
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struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
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if (!wilc_wfi_mon)
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return -EFAULT;
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mon_priv = netdev_priv(wilc_wfi_mon);
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if (!mon_priv)
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return -EFAULT;
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rtap_len = ieee80211_get_radiotap_len(skb->data);
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if (skb->len < rtap_len)
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return -1;
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skb_pull(skb, rtap_len);
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if (skb->data[0] == 0xc0 && (!(memcmp(broadcast, &skb->data[4], 6)))) {
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skb2 = dev_alloc_skb(skb->len + sizeof(struct wilc_wfi_radiotap_cb_hdr));
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memcpy(skb_put(skb2, skb->len), skb->data, skb->len);
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cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *)skb_push(skb2, sizeof(*cb_hdr));
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memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
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cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
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cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
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cb_hdr->hdr.it_present = cpu_to_le32(
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(1 << IEEE80211_RADIOTAP_RATE) |
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(1 << IEEE80211_RADIOTAP_TX_FLAGS));
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cb_hdr->rate = 5; /* txrate->bitrate / 5; */
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cb_hdr->tx_flags = 0x0004;
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skb2->dev = wilc_wfi_mon;
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skb_reset_mac_header(skb2);
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skb2->ip_summed = CHECKSUM_UNNECESSARY;
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skb2->pkt_type = PACKET_OTHERHOST;
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skb2->protocol = htons(ETH_P_802_2);
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memset(skb2->cb, 0, sizeof(skb2->cb));
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netif_rx(skb2);
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return 0;
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}
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skb->dev = mon_priv->real_ndev;
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/* Identify if Ethernet or MAC header (data or mgmt) */
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memcpy(srcadd, &skb->data[10], 6);
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memcpy(bssid, &skb->data[16], 6);
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/* if source address and bssid fields are equal>>Mac header */
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/*send it to mgmt frames handler */
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if (!(memcmp(srcadd, bssid, 6))) {
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ret = mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
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if (ret)
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netdev_err(dev, "fail to mgmt tx\n");
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dev_kfree_skb(skb);
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} else {
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ret = wilc_mac_xmit(skb, mon_priv->real_ndev);
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}
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return ret;
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}
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static const struct net_device_ops wilc_wfi_netdev_ops = {
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.ndo_start_xmit = WILC_WFI_mon_xmit,
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};
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/**
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* @brief WILC_WFI_init_mon_interface
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* @details
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* @param[in]
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* @return int : Return 0 on Success
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* @author mdaftedar
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* @date 12 JUL 2012
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* @version 1.0
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*/
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struct net_device *WILC_WFI_init_mon_interface(const char *name,
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struct net_device *real_dev)
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{
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u32 ret = 0;
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struct WILC_WFI_mon_priv *priv;
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/*If monitor interface is already initialized, return it*/
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if (wilc_wfi_mon)
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return wilc_wfi_mon;
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wilc_wfi_mon = alloc_etherdev(sizeof(struct WILC_WFI_mon_priv));
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if (!wilc_wfi_mon)
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return NULL;
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wilc_wfi_mon->type = ARPHRD_IEEE80211_RADIOTAP;
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strncpy(wilc_wfi_mon->name, name, IFNAMSIZ);
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wilc_wfi_mon->name[IFNAMSIZ - 1] = 0;
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wilc_wfi_mon->netdev_ops = &wilc_wfi_netdev_ops;
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ret = register_netdevice(wilc_wfi_mon);
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if (ret) {
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netdev_err(real_dev, "register_netdevice failed\n");
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return NULL;
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}
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priv = netdev_priv(wilc_wfi_mon);
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if (!priv)
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return NULL;
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priv->real_ndev = real_dev;
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return wilc_wfi_mon;
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}
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/**
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* @brief WILC_WFI_deinit_mon_interface
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* @details
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* @param[in]
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* @return int : Return 0 on Success
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* @author mdaftedar
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* @date 12 JUL 2012
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* @version 1.0
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*/
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int WILC_WFI_deinit_mon_interface(void)
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{
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bool rollback_lock = false;
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if (wilc_wfi_mon) {
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if (rtnl_is_locked()) {
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rtnl_unlock();
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rollback_lock = true;
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}
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unregister_netdev(wilc_wfi_mon);
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if (rollback_lock) {
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rtnl_lock();
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rollback_lock = false;
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}
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wilc_wfi_mon = NULL;
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}
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return 0;
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}
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