M7350/kernel/drivers/net/wireless/bcmdhd/wl_linux_mon.c

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2024-09-09 08:52:07 +00:00
/*
* 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;
}