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path: root/drivers/net/wireless/bcmdhd/wl_linux_mon.c
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Diffstat (limited to 'drivers/net/wireless/bcmdhd/wl_linux_mon.c')
-rwxr-xr-xdrivers/net/wireless/bcmdhd/wl_linux_mon.c422
1 files changed, 422 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcmdhd/wl_linux_mon.c b/drivers/net/wireless/bcmdhd/wl_linux_mon.c
new file mode 100755
index 0000000..af25863
--- /dev/null
+++ b/drivers/net/wireless/bcmdhd/wl_linux_mon.c
@@ -0,0 +1,422 @@
+/*
+ * Broadcom Dongle Host Driver (DHD), Linux monitor network interface
+ *
+ * Copyright (C) 1999-2012, Broadcom Corporation
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2 (the "GPL"),
+ * available at http://www.broadcom.com/licenses/GPLv2.php, with the
+ * following added to such license:
+ *
+ * As a special exception, the copyright holders of this software give you
+ * permission to link this software with independent modules, and to copy and
+ * distribute the resulting executable under terms of your choice, provided that
+ * you also meet, for each linked independent module, the terms and conditions of
+ * the license of that module. An independent module is a module which is not
+ * derived from this software. The special exception does not apply to any
+ * modifications of the software.
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a license
+ * other than the GPL, without Broadcom's express prior written consent.
+ *
+ * $Id: dhd_linux_mon.c 280623 2011-08-30 14:49:39Z $
+ */
+
+#include <osl.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/ieee80211.h>
+#include <linux/rtnetlink.h>
+#include <net/ieee80211_radiotap.h>
+
+#include <wlioctl.h>
+#include <bcmutils.h>
+#include <dhd_dbg.h>
+#include <dngl_stats.h>
+#include <dhd.h>
+
+typedef enum monitor_states
+{
+ MONITOR_STATE_DEINIT = 0x0,
+ MONITOR_STATE_INIT = 0x1,
+ MONITOR_STATE_INTERFACE_ADDED = 0x2,
+ MONITOR_STATE_INTERFACE_DELETED = 0x4
+} monitor_states_t;
+int dhd_add_monitor(char *name, struct net_device **new_ndev);
+extern int dhd_start_xmit(struct sk_buff *skb, struct net_device *net);
+int dhd_del_monitor(struct net_device *ndev);
+int dhd_monitor_init(void *dhd_pub);
+int dhd_monitor_uninit(void);
+
+/**
+ * Local declarations and defintions (not exposed)
+ */
+#ifndef DHD_MAX_IFS
+#define DHD_MAX_IFS 16
+#endif
+#define MON_PRINT(format, ...) printk("DHD-MON: %s " format, __func__, ##__VA_ARGS__)
+#define MON_TRACE MON_PRINT
+
+typedef struct monitor_interface {
+ int radiotap_enabled;
+ struct net_device* real_ndev; /* The real interface that the monitor is on */
+ struct net_device* mon_ndev;
+} monitor_interface;
+
+typedef struct dhd_linux_monitor {
+ void *dhd_pub;
+ monitor_states_t monitor_state;
+ monitor_interface mon_if[DHD_MAX_IFS];
+ struct mutex lock; /* lock to protect mon_if */
+} dhd_linux_monitor_t;
+
+static dhd_linux_monitor_t g_monitor;
+
+static struct net_device* lookup_real_netdev(char *name);
+static monitor_interface* ndev_to_monif(struct net_device *ndev);
+static int dhd_mon_if_open(struct net_device *ndev);
+static int dhd_mon_if_stop(struct net_device *ndev);
+static int dhd_mon_if_subif_start_xmit(struct sk_buff *skb, struct net_device *ndev);
+static void dhd_mon_if_set_multicast_list(struct net_device *ndev);
+static int dhd_mon_if_change_mac(struct net_device *ndev, void *addr);
+
+static const struct net_device_ops dhd_mon_if_ops = {
+ .ndo_open = dhd_mon_if_open,
+ .ndo_stop = dhd_mon_if_stop,
+ .ndo_start_xmit = dhd_mon_if_subif_start_xmit,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0))
+ .ndo_set_rx_mode = dhd_mon_if_set_multicast_list,
+#else
+ .ndo_set_multicast_list = dhd_mon_if_set_multicast_list,
+#endif
+ .ndo_set_mac_address = dhd_mon_if_change_mac,
+};
+
+/**
+ * Local static function defintions
+ */
+
+/* Look up dhd's net device table to find a match (e.g. interface "eth0" is a match for "mon.eth0"
+ * "p2p-eth0-0" is a match for "mon.p2p-eth0-0")
+ */
+static struct net_device* lookup_real_netdev(char *name)
+{
+ struct net_device *ndev_found = NULL;
+
+ int i;
+ int len = 0;
+ int last_name_len = 0;
+ struct net_device *ndev;
+
+ /* We need to find interface "p2p-p2p-0" corresponding to monitor interface "mon-p2p-0",
+ * Once mon iface name reaches IFNAMSIZ, it is reset to p2p0-0 and corresponding mon
+ * iface would be mon-p2p0-0.
+ */
+ for (i = 0; i < DHD_MAX_IFS; i++) {
+ ndev = dhd_idx2net(g_monitor.dhd_pub, i);
+
+ /* Skip "p2p" and look for "-p2p0-x" in monitor interface name. If it
+ * it matches, then this netdev is the corresponding real_netdev.
+ */
+ if (ndev && strstr(ndev->name, "p2p-p2p0")) {
+ len = strlen("p2p");
+ } else {
+ /* if p2p- is not present, then the IFNAMSIZ have reached and name
+ * would have got reset. In this casse,look for p2p0-x in mon-p2p0-x
+ */
+ len = 0;
+ }
+ if (ndev && strstr(name, (ndev->name + len))) {
+ if (strlen(ndev->name) > last_name_len) {
+ ndev_found = ndev;
+ last_name_len = strlen(ndev->name);
+ }
+ }
+ }
+
+ return ndev_found;
+}
+
+static monitor_interface* ndev_to_monif(struct net_device *ndev)
+{
+ int i;
+
+ for (i = 0; i < DHD_MAX_IFS; i++) {
+ if (g_monitor.mon_if[i].mon_ndev == ndev)
+ return &g_monitor.mon_if[i];
+ }
+
+ return NULL;
+}
+
+static int dhd_mon_if_open(struct net_device *ndev)
+{
+ int ret = 0;
+
+ MON_PRINT("enter\n");
+ return ret;
+}
+
+static int dhd_mon_if_stop(struct net_device *ndev)
+{
+ int ret = 0;
+
+ MON_PRINT("enter\n");
+ return ret;
+}
+
+static int dhd_mon_if_subif_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ int ret = 0;
+ int rtap_len;
+ int qos_len = 0;
+ int dot11_hdr_len = 24;
+ int snap_len = 6;
+ unsigned char *pdata;
+ unsigned short frame_ctl;
+ unsigned char src_mac_addr[6];
+ unsigned char dst_mac_addr[6];
+ struct ieee80211_hdr *dot11_hdr;
+ struct ieee80211_radiotap_header *rtap_hdr;
+ monitor_interface* mon_if;
+
+ MON_PRINT("enter\n");
+
+ mon_if = ndev_to_monif(ndev);
+ if (mon_if == NULL || mon_if->real_ndev == NULL) {
+ MON_PRINT(" cannot find matched net dev, skip the packet\n");
+ goto fail;
+ }
+
+ if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
+ goto fail;
+
+ rtap_hdr = (struct ieee80211_radiotap_header *)skb->data;
+ if (unlikely(rtap_hdr->it_version))
+ goto fail;
+
+ rtap_len = ieee80211_get_radiotap_len(skb->data);
+ if (unlikely(skb->len < rtap_len))
+ goto fail;
+
+ MON_PRINT("radiotap len (should be 14): %d\n", rtap_len);
+
+ /* Skip the ratio tap header */
+ skb_pull(skb, rtap_len);
+
+ dot11_hdr = (struct ieee80211_hdr *)skb->data;
+ frame_ctl = le16_to_cpu(dot11_hdr->frame_control);
+ /* Check if the QoS bit is set */
+ if ((frame_ctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
+ /* Check if this ia a Wireless Distribution System (WDS) frame
+ * which has 4 MAC addresses
+ */
+ if (dot11_hdr->frame_control & 0x0080)
+ qos_len = 2;
+ if ((dot11_hdr->frame_control & 0x0300) == 0x0300)
+ dot11_hdr_len += 6;
+
+ memcpy(dst_mac_addr, dot11_hdr->addr1, sizeof(dst_mac_addr));
+ memcpy(src_mac_addr, dot11_hdr->addr2, sizeof(src_mac_addr));
+
+ /* Skip the 802.11 header, QoS (if any) and SNAP, but leave spaces for
+ * for two MAC addresses
+ */
+ skb_pull(skb, dot11_hdr_len + qos_len + snap_len - sizeof(src_mac_addr) * 2);
+ pdata = (unsigned char*)skb->data;
+ memcpy(pdata, dst_mac_addr, sizeof(dst_mac_addr));
+ memcpy(pdata + sizeof(dst_mac_addr), src_mac_addr, sizeof(src_mac_addr));
+ PKTSETPRIO(skb, 0);
+
+ MON_PRINT("if name: %s, matched if name %s\n", ndev->name, mon_if->real_ndev->name);
+
+ /* Use the real net device to transmit the packet */
+ ret = dhd_start_xmit(skb, mon_if->real_ndev);
+
+ return ret;
+ }
+fail:
+ dev_kfree_skb(skb);
+ return 0;
+}
+
+static void dhd_mon_if_set_multicast_list(struct net_device *ndev)
+{
+ monitor_interface* mon_if;
+
+ mon_if = ndev_to_monif(ndev);
+ if (mon_if == NULL || mon_if->real_ndev == NULL) {
+ MON_PRINT(" cannot find matched net dev, skip the packet\n");
+ } else {
+ MON_PRINT("enter, if name: %s, matched if name %s\n",
+ ndev->name, mon_if->real_ndev->name);
+ }
+}
+
+static int dhd_mon_if_change_mac(struct net_device *ndev, void *addr)
+{
+ int ret = 0;
+ monitor_interface* mon_if;
+
+ mon_if = ndev_to_monif(ndev);
+ if (mon_if == NULL || mon_if->real_ndev == NULL) {
+ MON_PRINT(" cannot find matched net dev, skip the packet\n");
+ } else {
+ MON_PRINT("enter, if name: %s, matched if name %s\n",
+ ndev->name, mon_if->real_ndev->name);
+ }
+ return ret;
+}
+
+/**
+ * Global function definitions (declared in dhd_linux_mon.h)
+ */
+
+int dhd_add_monitor(char *name, struct net_device **new_ndev)
+{
+ int i;
+ int idx = -1;
+ int ret = 0;
+ struct net_device* ndev = NULL;
+ dhd_linux_monitor_t **dhd_mon;
+
+ mutex_lock(&g_monitor.lock);
+
+ MON_TRACE("enter, if name: %s\n", name);
+ if (!name || !new_ndev) {
+ MON_PRINT("invalid parameters\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Find a vacancy
+ */
+ for (i = 0; i < DHD_MAX_IFS; i++)
+ if (g_monitor.mon_if[i].mon_ndev == NULL) {
+ idx = i;
+ break;
+ }
+ if (idx == -1) {
+ MON_PRINT("exceeds maximum interfaces\n");
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ndev = alloc_etherdev(sizeof(dhd_linux_monitor_t*));
+ if (!ndev) {
+ MON_PRINT("failed to allocate memory\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ndev->type = ARPHRD_IEEE80211_RADIOTAP;
+ strncpy(ndev->name, name, IFNAMSIZ);
+ ndev->name[IFNAMSIZ - 1] = 0;
+ ndev->netdev_ops = &dhd_mon_if_ops;
+
+ ret = register_netdevice(ndev);
+ if (ret) {
+ MON_PRINT(" register_netdevice failed (%d)\n", ret);
+ goto out;
+ }
+
+ *new_ndev = ndev;
+ g_monitor.mon_if[idx].radiotap_enabled = TRUE;
+ g_monitor.mon_if[idx].mon_ndev = ndev;
+ g_monitor.mon_if[idx].real_ndev = lookup_real_netdev(name);
+ dhd_mon = (dhd_linux_monitor_t **)netdev_priv(ndev);
+ *dhd_mon = &g_monitor;
+ g_monitor.monitor_state = MONITOR_STATE_INTERFACE_ADDED;
+ MON_PRINT("net device returned: 0x%p\n", ndev);
+ MON_PRINT("found a matched net device, name %s\n", g_monitor.mon_if[idx].real_ndev->name);
+
+out:
+ if (ret && ndev)
+ free_netdev(ndev);
+
+ mutex_unlock(&g_monitor.lock);
+ return ret;
+
+}
+
+int dhd_del_monitor(struct net_device *ndev)
+{
+ int i;
+ bool rollback_lock = false;
+ if (!ndev)
+ return -EINVAL;
+ mutex_lock(&g_monitor.lock);
+ for (i = 0; i < DHD_MAX_IFS; i++) {
+ if (g_monitor.mon_if[i].mon_ndev == ndev ||
+ g_monitor.mon_if[i].real_ndev == ndev) {
+ g_monitor.mon_if[i].real_ndev = NULL;
+ if (rtnl_is_locked()) {
+ rtnl_unlock();
+ rollback_lock = true;
+ }
+ unregister_netdev(g_monitor.mon_if[i].mon_ndev);
+ free_netdev(g_monitor.mon_if[i].mon_ndev);
+ g_monitor.mon_if[i].mon_ndev = NULL;
+ g_monitor.monitor_state = MONITOR_STATE_INTERFACE_DELETED;
+ break;
+ }
+ }
+ if (rollback_lock) {
+ rtnl_lock();
+ rollback_lock = false;
+ }
+
+ if (g_monitor.monitor_state !=
+ MONITOR_STATE_INTERFACE_DELETED)
+ MON_PRINT("interface not found in monitor IF array, is this a monitor IF? 0x%p\n",
+ ndev);
+ mutex_unlock(&g_monitor.lock);
+
+ return 0;
+}
+
+int dhd_monitor_init(void *dhd_pub)
+{
+ if (g_monitor.monitor_state == MONITOR_STATE_DEINIT) {
+ g_monitor.dhd_pub = dhd_pub;
+ mutex_init(&g_monitor.lock);
+ g_monitor.monitor_state = MONITOR_STATE_INIT;
+ }
+ return 0;
+}
+
+int dhd_monitor_uninit(void)
+{
+ int i;
+ struct net_device *ndev;
+ bool rollback_lock = false;
+ mutex_lock(&g_monitor.lock);
+ if (g_monitor.monitor_state != MONITOR_STATE_DEINIT) {
+ for (i = 0; i < DHD_MAX_IFS; i++) {
+ ndev = g_monitor.mon_if[i].mon_ndev;
+ if (ndev) {
+ if (rtnl_is_locked()) {
+ rtnl_unlock();
+ rollback_lock = true;
+ }
+ unregister_netdev(ndev);
+ free_netdev(ndev);
+ g_monitor.mon_if[i].real_ndev = NULL;
+ g_monitor.mon_if[i].mon_ndev = NULL;
+ if (rollback_lock) {
+ rtnl_lock();
+ rollback_lock = false;
+ }
+ }
+ }
+ g_monitor.monitor_state = MONITOR_STATE_DEINIT;
+ }
+ mutex_unlock(&g_monitor.lock);
+ return 0;
+}