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lineage_kernel_xcoverpro/drivers/net/wireless/scsc/udi.c

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/****************************************************************************
*
* Copyright (c) 2012 - 2018 Samsung Electronics Co., Ltd. All rights reserved
*
****************************************************************************/
#include <linux/sysfs.h>
#include <linux/poll.h>
#include <linux/cdev.h>
#include "dev.h"
#include "hip.h"
#include "log_clients.h"
#include "mlme.h"
#include "fw_test.h"
#include "debug.h"
#include "udi.h"
#include "src_sink.h"
#include "unifiio.h"
#include "procfs.h"
#ifdef SLSI_TEST_DEV
#include "unittest.h"
#define UDI_CHAR_DEVICE_NAME "s5n2560unittest"
#define UDI_CLASS_NAME "s5n2560test"
#else
#define UDI_CHAR_DEVICE_NAME "s5n2560udi"
#define UDI_CLASS_NAME "s5n2560"
#endif
#define UDI_LOG_MASK_FILTER_NUM_MAX 5
#define UDI_MIB_SET_LEN_MAX 65535
#define UDI_MIB_GET_LEN_MAX 2048
#ifndef ETH_P_WAPI
#define ETH_P_WAPI 0x88b4
#endif
#define SLSI_IP_TYPE_UDP 0x11
#define SLSI_DHCP_SERVER_PORT 67
#define SLSI_DHCP_CLIENT_PORT 68
#define SLSI_DHCP_MAGIC_OFFSET 272
#define SLSI_DHCP_MESSAGE_TYPE_ACK 0x05
/**
* Control character device for debug
* ==================================
*/
#define NUM_CHAR_CLIENTS 12 /* Number of client programmes on one node. */
#define MAX_MINOR (SLSI_UDI_MINOR_NODES - 1) /* Maximum node number. */
static dev_t major_number; /* Major number of device created by system. */
static struct class *class; /* Device class. */
struct slsi_cdev_client;
struct slsi_cdev {
int minor;
struct cdev cdev;
struct slsi_cdev_client *client[NUM_CHAR_CLIENTS];
struct slsi_dev *sdev;
struct device *parent;
};
struct slsi_cdev_client {
struct slsi_cdev *ufcdev;
int log_enabled;
int log_allow_driver_signals;
u16 tx_sender_id;
struct slsi_fw_test fw_test;
/* Flags set for special filtering of ma_packet data */
u16 ma_unitdata_filter_config;
u16 ma_unitdata_size_limit;
struct sk_buff_head log_list;
struct semaphore log_mutex;
wait_queue_head_t log_wq;
/* Drop Frames and report the number dropped */
#define UDI_MAX_QUEUED_FRAMES 10000
#define UDI_RESTART_QUEUED_FRAMES 9000
#define UDI_MAX_QUEUED_DATA_FRAMES 9000
#define UDI_RESTART_QUEUED_DATA_FRAMES 8000
/* Start dropping ALL frames at queue_len == UDI_MAX_QUEUED_FRAMES
* Restart queueing ALL frames at queue_len == UDI_RESTART_QUEUED_FRAMES
* Enable MA_PACKET filters at queue_len == UDI_MAX_QUEUED_DATA_FRAMES
* Disable MA_PACKET filters at queue_len == UDI_RESTART_QUEUED_DATA_FRAMES
*/
u32 log_dropped;
u32 log_dropped_data;
bool log_drop_data_packets;
};
static inline bool slsi_cdev_unitdata_filter_allow(struct slsi_cdev_client *client, u16 filter)
{
return (client->ma_unitdata_filter_config & filter) == filter;
}
/* One minor node per phy. In normal driver mode, this may be one.
* In unit test mode, this may be several.
*/
static struct slsi_cdev *uf_cdevs[SLSI_UDI_MINOR_NODES];
static int udi_log_event(struct slsi_log_client *log_client, struct sk_buff *skb, int dir);
static int send_signal_to_log_filter(struct slsi_log_client *log_client, struct sk_buff *skb, int dir);
static int send_signal_to_inverse_log_filter(struct slsi_log_client *log_client, struct sk_buff *skb, int dir);
int slsi_check_cdev_refs(void)
{
int client_num;
int cdev_num;
struct slsi_cdev *cdev = NULL;
for (cdev_num = 0; cdev_num < SLSI_UDI_MINOR_NODES; cdev_num++) {
cdev = uf_cdevs[cdev_num];
if (!cdev)
continue;
for (client_num = 0; client_num < NUM_CHAR_CLIENTS; client_num++)
if (cdev->client[client_num])
return 1;
}
return 0;
}
int slsi_kernel_to_user_space_event(struct slsi_log_client *log_client, u16 event, u32 data_length, const u8 *data)
{
struct slsi_cdev_client *client = log_client->log_client_ctx;
struct sk_buff *skb;
int ret;
if (WARN_ON(!client))
return -EINVAL;
if (!client->log_allow_driver_signals)
return 0;
skb = fapi_alloc_f(sizeof(struct fapi_signal_header), data_length, event, 0, __FILE__, __LINE__);
if (WARN_ON(!skb))
return -ENOMEM;
if (data_length)
fapi_append_data(skb, data, data_length);
ret = udi_log_event(log_client, skb, UDI_CONFIG_IND);
if (ret)
SLSI_WARN_NODEV("Udi log event not registered\n");
/* udi_log_event takes a copy, so ensure that the skb allocated in this
* function is freed again.
*/
kfree_skb(skb);
return ret;
}
static int slsi_cdev_open(struct inode *inode, struct file *file)
{
struct slsi_cdev *uf_cdev;
struct slsi_cdev_client *client;
int indx;
int minor;
minor = iminor(inode);
if (minor > MAX_MINOR) {
SLSI_ERR_NODEV("minor %d exceeds range\n", minor);
return -EINVAL;
}
uf_cdev = uf_cdevs[minor];
if (!uf_cdev) {
SLSI_ERR_NODEV("no cdev instance for minor %d\n", minor);
return -EINVAL;
}
for (indx = 0; indx < NUM_CHAR_CLIENTS; indx++)
if (!uf_cdev->client[indx])
break;
if (indx >= NUM_CHAR_CLIENTS) {
SLSI_ERR_NODEV("already opened\n");
return -ENOTSUPP;
}
client = kmalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
memset(client, 0, sizeof(struct slsi_cdev_client));
/* init other resource */
skb_queue_head_init(&client->log_list);
init_waitqueue_head(&client->log_wq);
sema_init(&client->log_mutex, 1);
client->tx_sender_id = SLSI_TX_PROCESS_ID_UDI_MIN;
slsi_fw_test_init(uf_cdev->sdev, &client->fw_test);
client->ufcdev = uf_cdev;
uf_cdev->client[indx] = client;
file->private_data = client;
slsi_procfs_inc_node();
#if IS_ENABLED(CONFIG_SCSC_MXLOGGER)
scsc_service_register_observer(NULL, "udi");
#endif
SLSI_DBG1_NODEV(SLSI_UDI, "Client:%d added\n", indx);
return 0;
}
static int slsi_cdev_release(struct inode *inode, struct file *filp)
{
struct slsi_cdev_client *client = (void *)filp->private_data;
struct slsi_cdev *uf_cdev;
int indx;
int minor;
minor = iminor(inode);
if (minor > MAX_MINOR) {
SLSI_ERR_NODEV("minor %d exceeds range\n", minor);
return -EINVAL;
}
uf_cdev = uf_cdevs[minor];
if (!uf_cdev) {
SLSI_ERR_NODEV("no cdev instance for minor %d\n", minor);
return -EINVAL;
}
if (!client)
return -EINVAL;
for (indx = 0; indx < NUM_CHAR_CLIENTS; indx++)
if (uf_cdev->client[indx] == client)
break;
if (indx >= NUM_CHAR_CLIENTS) {
SLSI_ERR_NODEV("client not found in list\n");
return -EINVAL;
}
if (waitqueue_active(&client->log_wq))
wake_up_interruptible(&client->log_wq);
if (client->log_enabled)
slsi_log_client_unregister(client->ufcdev->sdev, client);
skb_queue_purge(&client->log_list);
slsi_fw_test_deinit(uf_cdev->sdev, &client->fw_test);
uf_cdev->client[indx] = NULL;
/* free other resource */
kfree(client);
slsi_procfs_dec_node();
#if IS_ENABLED(CONFIG_SCSC_MXLOGGER)
scsc_service_unregister_observer(NULL, "udi");
#endif
SLSI_DBG1_NODEV(SLSI_UDI, "Client:%d removed\n", indx);
return 0;
}
static ssize_t slsi_cdev_read(struct file *filp, char *p, size_t len, loff_t *poff)
{
struct slsi_cdev_client *client = (void *)filp->private_data;
struct slsi_dev *sdev;
int msglen;
struct sk_buff *skb;
SLSI_UNUSED_PARAMETER(poff);
if (!client)
return -EINVAL;
if (!skb_queue_len(&client->log_list)) {
if (filp->f_flags & O_NONBLOCK)
return 0;
/* wait until getting a signal */
if (wait_event_interruptible(client->log_wq, skb_queue_len(&client->log_list))) {
SLSI_ERR_NODEV("slsi_cdev_read: wait_event_interruptible failed.\n");
return -ERESTARTSYS;
}
}
sdev = client->ufcdev->sdev;
if (!sdev) {
SLSI_ERR_NODEV("sdev not set\n");
return -EINVAL;
}
skb = skb_dequeue(&client->log_list);
if (!skb) {
SLSI_ERR(sdev, "No Data\n");
return -EINVAL;
}
slsi_fw_test_signal_with_udi_header(sdev, &client->fw_test, skb);
msglen = skb->len;
if (msglen > (s32)len) {
SLSI_WARN(sdev, "truncated read to %d actual msg len is %lu\n", msglen, (unsigned long int)len);
msglen = len;
}
if (copy_to_user(p, skb->data, msglen)) {
SLSI_ERR(sdev, "Failed to copy UDI log to user\n");
kfree_skb(skb);
return -EFAULT;
}
kfree_skb(skb);
return msglen;
}
static ssize_t slsi_cdev_write(struct file *filp, const char *p, size_t len, loff_t *poff)
{
struct slsi_cdev_client *client;
struct slsi_dev *sdev;
struct sk_buff *skb;
u8 *data;
struct slsi_skb_cb *cb;
SLSI_UNUSED_PARAMETER(poff);
client = (void *)filp->private_data;
if (!client) {
SLSI_ERR_NODEV("filep private data not set\n");
return -EINVAL;
}
if (!client->ufcdev) {
SLSI_ERR_NODEV("ufcdev not set\n");
return -EINVAL;
}
sdev = client->ufcdev->sdev;
if (!sdev) {
SLSI_ERR_NODEV("sdev not set\n");
return -EINVAL;
}
skb = alloc_skb(SLSI_NETIF_SKB_HEADROOM + SLSI_NETIF_SKB_TAILROOM + len, GFP_KERNEL);
if (!skb) {
SLSI_WARN_NODEV("error allocating skb (len: %d)\n", len);
return -ENOMEM;
}
skb_reserve(skb, SLSI_NETIF_SKB_HEADROOM - SLSI_SKB_GET_ALIGNMENT_OFFSET(skb));
data = skb_put(skb, len);
if (copy_from_user(data, p, len)) {
SLSI_ERR(sdev, "copy from user failed\n");
kfree_skb(skb);
return -EFAULT;
}
cb = slsi_skb_cb_init(skb);
cb->sig_length = fapi_get_expected_size(skb);
cb->data_length = skb->len;
/* F/w will panic if fw_reference is not zero. */
fapi_set_u32(skb, fw_reference, 0);
/* set mac header uses values from above initialized cb */
skb_set_mac_header(skb, fapi_get_data(skb) - skb->data);
SLSI_DBG3_NODEV(SLSI_UDI,
"UDI Signal:%.4X SigLEN:%d DataLen:%d SKBHeadroom:%d bytes:%d\n",
fapi_get_sigid(skb), fapi_get_siglen(skb),
fapi_get_datalen(skb), skb_headroom(skb), (int)len);
/* In WlanLite test mode req signals IDs are 0x1000, 0x1002, 0x1004 */
if (slsi_is_test_mode_enabled() || fapi_is_req(skb) || fapi_is_res(skb)) {
/* Use the range of PIDs allocated to the udi clients */
client->tx_sender_id++;
if (client->tx_sender_id > SLSI_TX_PROCESS_ID_UDI_MAX)
client->tx_sender_id = SLSI_TX_PROCESS_ID_UDI_MIN;
fapi_set_u16(skb, sender_pid, client->tx_sender_id);
if (!slsi_is_test_mode_enabled())
slsi_fw_test_signal(sdev, &client->fw_test, skb);
if (fapi_is_ma(skb)) {
if (slsi_tx_data_lower(sdev, skb)) {
kfree_skb(skb);
return -EINVAL;
}
} else if (slsi_tx_control(sdev, NULL, skb)) {
kfree_skb(skb);
return -EINVAL;
}
} else if (slsi_hip_rx(sdev, skb)) {
kfree_skb(skb);
return -EINVAL;
}
return len;
}
static long slsi_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct slsi_cdev_client *client = (void *)filp->private_data;
struct slsi_dev *sdev;
long r = 0;
int int_param;
u32 mib_data_length; /* Length of valid Mib data in the buffer */
u32 mib_data_size; /* Size of the mib buffer */
unsigned char *mib_data; /* Mib Input/Output Buffer */
u16 mib_vif;
if (!client || !client->ufcdev)
return -EINVAL;
sdev = client->ufcdev->sdev;
slsi_wake_lock(&sdev->wlan_wl);
switch (cmd) {
case UNIFI_GET_UDI_ENABLE:
int_param = client->log_enabled;
put_user(int_param, (int *)arg);
break;
case UNIFI_SET_UDI_ENABLE:
if (get_user(int_param, (int *)arg)) {
r = -EFAULT;
break;
}
if (int_param) {
slsi_log_client_register(sdev, client, udi_log_event, NULL, 0, 0);
client->log_enabled = 1;
if (int_param > 1)
client->log_allow_driver_signals = 1;
} else {
slsi_log_client_unregister(sdev, client);
client->log_enabled = 0;
}
break;
case UNIFI_SET_UDI_LOG_CONFIG:
{
struct unifiio_udi_config_t config;
if (copy_from_user(&config, (void *)arg, sizeof(config))) {
SLSI_ERR(sdev, "UNIFI_SET_UDI_LOG_CONFIG: Failed to copy from userspace\n");
r = -EFAULT;
break;
}
client->ma_unitdata_size_limit = config.ma_unitdata_size_limit;
break;
}
case UNIFI_SET_UDI_LOG_MASK:
{
struct unifiio_filter_t filter;
int i;
/* to minimise load on data path, list is converted here to array indexed by signal number */
if (copy_from_user(&filter, (void *)arg, sizeof(filter))) {
SLSI_ERR(sdev, "UNIFI_SET_UDI_LOG_MASK: Failed to copy from userspace\n");
r = -EFAULT;
break;
}
if (unlikely(filter.signal_ids_n > UDI_LOG_MASK_FILTER_NUM_MAX)) {
SLSI_ERR(sdev, "UNIFI_SET_UDI_LOG_MASK: number of filters too long\n");
r = -EFAULT;
break;
}
if (filter.signal_ids_n) {
char *signal_filter_index;
int max;
int min;
max = filter.signal_ids[0];
min = filter.signal_ids[0];
/* find maximum and minimum signal id in filter */
for (i = 0; i < filter.signal_ids_n; i++) {
if (filter.signal_ids[i] & UDI_MA_UNITDATA_FILTER_ALLOW_MASK) {
client->ma_unitdata_filter_config |= filter.signal_ids[i];
continue;
}
if (filter.signal_ids[i] > max)
max = filter.signal_ids[i];
else if (filter.signal_ids[i] < min)
min = filter.signal_ids[i];
}
/* and create array only big enough to index the range of signal id specified */
signal_filter_index = kmalloc(max - min + 1, GFP_KERNEL);
if (signal_filter_index) {
memset(signal_filter_index, 0, max - min + 1);
for (i = 0; i < filter.signal_ids_n; i++) {
if (filter.signal_ids[i] & UDI_MA_UNITDATA_FILTER_ALLOW_MASK)
continue;
signal_filter_index[filter.signal_ids[i] - min] = 1;
}
slsi_log_client_unregister(sdev, client);
slsi_log_client_register(sdev, client,
filter.log_listed_flag ? send_signal_to_inverse_log_filter :
send_signal_to_log_filter, signal_filter_index, min, max);
} else {
r = -ENOMEM;
}
}
break;
}
case UNIFI_SET_MIB:
{
struct net_device *dev = NULL;
if (sdev->device_state != SLSI_DEVICE_STATE_STARTED) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Device not yet available\n");
r = -EFAULT;
break;
}
/* First 2 Bytes are the VIF */
if (copy_from_user((void *)&mib_vif, (void *)arg, 2)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to copy in vif\n");
r = -EFAULT;
break;
}
/* First 4 Bytes are the Number of Bytes of input Data */
if (copy_from_user((void *)&mib_data_length, (void *)(arg + 2), 4)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to copy in mib_data_length\n");
r = -EFAULT;
break;
}
/* Second 4 Bytes are the size of the Buffer */
if (copy_from_user((void *)&mib_data_size, (void *)(arg + 6), 4)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to copy in mib_data_size\n");
r = -EFAULT;
break;
}
/* check if length is valid */
if (unlikely(mib_data_length > UDI_MIB_SET_LEN_MAX || mib_data_size > UDI_MIB_SET_LEN_MAX)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: size too long (mib_data_length:%u mib_data_size:%u)\n", mib_data_length, mib_data_size);
r = -EFAULT;
break;
}
mib_data = kmalloc(mib_data_size, GFP_KERNEL);
if (!mib_data) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to allocate memory for mib_data\n");
r = -ENOMEM;
break;
}
/* Read the rest of the Mib Data */
if (copy_from_user((void *)mib_data, (void *)(arg + 10), mib_data_length)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to copy in mib_data\n");
kfree(mib_data);
r = -EFAULT;
break;
}
SLSI_MUTEX_LOCK(sdev->netdev_add_remove_mutex);
dev = slsi_get_netdev_locked(sdev, mib_vif);
if (mib_vif != 0 && !dev) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed - net_device is NULL for interface = %d\n", mib_vif);
kfree(mib_data);
r = -EFAULT;
SLSI_MUTEX_UNLOCK(sdev->netdev_add_remove_mutex);
break;
}
r = slsi_mlme_set(sdev, dev, mib_data, mib_data_length);
SLSI_MUTEX_UNLOCK(sdev->netdev_add_remove_mutex);
kfree(mib_data);
break;
}
case UNIFI_GET_MIB:
{
struct net_device *dev = NULL;
if (sdev->device_state != SLSI_DEVICE_STATE_STARTED) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Device not yet available\n");
r = -EFAULT;
break;
}
/* First 2 Bytes are the VIF */
if (copy_from_user((void *)&mib_vif, (void *)arg, 2)) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed to copy in vif\n");
r = -EFAULT;
break;
}
/* First 4 Bytes are the Number of Bytes of input Data */
if (copy_from_user((void *)&mib_data_length, (void *)(arg + 2), 4)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to copy in mib_data_length\n");
r = -EFAULT;
break;
}
/* Second 4 Bytes are the size of the Buffer */
if (copy_from_user((void *)&mib_data_size, (void *)(arg + 6), 4)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to copy in mib_data_size\n");
r = -EFAULT;
break;
}
/* check if length is valid */
if (unlikely(mib_data_length > UDI_MIB_GET_LEN_MAX || mib_data_size > UDI_MIB_GET_LEN_MAX)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: size too long (mib_data_length:%u mib_data_size:%u)\n", mib_data_length, mib_data_size);
r = -EFAULT;
break;
}
mib_data = kmalloc(mib_data_size, GFP_KERNEL);
if (!mib_data) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to allocate memory for mib_data\n");
r = -ENOMEM;
break;
}
/* Read the rest of the Mib Data */
if (copy_from_user((void *)mib_data, (void *)(arg + 10), mib_data_length)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to copy in mib_data\n");
kfree(mib_data);
r = -EFAULT;
break;
}
SLSI_MUTEX_LOCK(sdev->netdev_add_remove_mutex);
dev = slsi_get_netdev_locked(sdev, mib_vif);
if (mib_vif != 0 && !dev) {
SLSI_ERR(sdev, "UNIFI_SET_MIB: Failed - net_device is NULL for interface = %d\n", mib_vif);
kfree(mib_data);
r = -EFAULT;
SLSI_MUTEX_UNLOCK(sdev->netdev_add_remove_mutex);
break;
}
if (slsi_mlme_get(sdev, dev, mib_data, mib_data_length, mib_data, mib_data_size, &mib_data_length)) {
kfree(mib_data);
r = -EINVAL;
SLSI_MUTEX_UNLOCK(sdev->netdev_add_remove_mutex);
break;
}
SLSI_MUTEX_UNLOCK(sdev->netdev_add_remove_mutex);
/* Check the buffer is big enough */
if (mib_data_length > mib_data_size) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Mib result data is to long. (%d bytes when the max is %d bytes)\n", mib_data_length, mib_data_size);
kfree(mib_data);
r = -EINVAL;
break;
}
/* Copy back the number of Bytes in the Mib result */
if (copy_to_user((void *)arg, (void *)&mib_data_length, 4)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to copy in mib_data_length back to user\n");
kfree(mib_data);
r = -EINVAL;
break;
}
/* Copy back the Mib data */
if (copy_to_user((void *)(arg + 4), mib_data, mib_data_length)) {
SLSI_ERR(sdev, "UNIFI_GET_MIB: Failed to copy in mib_data back to user\n");
kfree(mib_data);
r = -EINVAL;
break;
}
kfree(mib_data);
break;
}
case UNIFI_SRC_SINK_IOCTL:
if (sdev->device_state != SLSI_DEVICE_STATE_STARTED) {
SLSI_ERR(sdev, "UNIFI_SRC_SINK_IOCTL: Device not yet available\n");
r = -EFAULT;
break;
}
r = slsi_src_sink_cdev_ioctl_cfg(sdev, arg);
break;
case UNIFI_SOFTMAC_CFG:
{
u32 softmac_cmd;
u8 cmd_param_size;
SLSI_ERR(sdev, "UNIFI_SOFTMAC_CFG\n");
if (copy_from_user((void *)&softmac_cmd, (void *)arg, 4)) {
SLSI_ERR(sdev, "Failed to get the command\n");
r = -EFAULT;
break;
}
SLSI_DBG3_NODEV(SLSI_UDI, "softmac_cmd -> %u\n", softmac_cmd);
arg += sizeof(softmac_cmd); /* Advance past the command bit */
if (copy_from_user((void *)&cmd_param_size, (void *)(arg + 4), 1)) {
SLSI_ERR(sdev, "Failed to get the command size\n");
r = -EFAULT;
break;
}
SLSI_DBG3_NODEV(SLSI_UDI, "cmd_param_size -> %u\n", cmd_param_size);
if (cmd_param_size)
client->ma_unitdata_filter_config = UDI_MA_UNITDATA_FILTER_ALLOW_EAPOL_ID;
else
client->ma_unitdata_filter_config = 0;
break;
}
default:
SLSI_WARN(sdev, "Operation (%d) not supported\n", cmd);
r = -EINVAL;
}
slsi_wake_unlock(&sdev->wlan_wl);
return r;
}
static unsigned int slsi_cdev_poll(struct file *filp, poll_table *wait)
{
struct slsi_cdev_client *client = (void *)filp->private_data;
SLSI_DBG4_NODEV(SLSI_UDI, "Poll(%d)\n", skb_queue_len(&client->log_list));
if (skb_queue_len(&client->log_list))
return POLLIN | POLLRDNORM; /* readable */
poll_wait(filp, &client->log_wq, wait);
if (skb_queue_len(&client->log_list))
return POLLIN | POLLRDNORM; /* readable */
return 0;
}
/* we know for sure that there is a filter present in log_client->signal_filter if this function is called.
* we know this because it is called only through a function pointer that is assigned
* only when a filter is also set up in the log_client
*/
static int send_signal_to_log_filter(struct slsi_log_client *log_client, struct sk_buff *skb, int dir)
{
int ret = 0;
u16 signal_id = fapi_get_sigid(skb);
if (signal_id > log_client->max_signal_id || signal_id < log_client->min_signal_id || !log_client->signal_filter[signal_id - log_client->min_signal_id])
ret = udi_log_event(log_client, skb, dir);
return ret;
}
static int send_signal_to_inverse_log_filter(struct slsi_log_client *log_client, struct sk_buff *skb, int dir)
{
int ret = 0;
u16 signal_id = fapi_get_sigid(skb);
if (signal_id <= log_client->max_signal_id && signal_id >= log_client->min_signal_id && log_client->signal_filter[signal_id - log_client->min_signal_id])
ret = udi_log_event(log_client, skb, dir);
return ret;
}
static bool is_allowed_ip_frame(struct ethhdr *ehdr, u16 signal_id)
{
u8 *ip_frame = ((u8 *)ehdr) + sizeof(struct ethhdr);
u8 *ip_data;
u16 ip_data_offset = 20;
/*u8 version = ip_frame[0] >> 4; */
u8 hlen = ip_frame[0] & 0x0F;
/*u8 tos = ip_frame[1]; */
/*u16 len = ip_frame[2] << 8 | frame[3]; */
/*u16 id = ip_frame[4] << 8 | frame[5]; */
/*u16 flags_foff = ip_frame[6] << 8 | frame[7]; */
/*u8 ttl = ip_frame[8]; */
u8 ip_proto = ip_frame[9];
/*u16 cksum = ip_frame[10] << 8 | frame[11]; */
/*u8 *src_ip = &ip_frame[12];*/
/*u8 *dest_ip = &ip_frame[16];*/
SLSI_UNUSED_PARAMETER(signal_id);
if (hlen > 5)
ip_data_offset += (hlen - 5) * 4;
ip_data = ip_frame + ip_data_offset;
switch (ip_proto) {
case SLSI_IP_TYPE_UDP:
{
u16 srcport = ip_data[0] << 8 | ip_data[1];
u16 dstport = ip_data[2] << 8 | ip_data[3];
SLSI_DBG3_NODEV(SLSI_UDI, "FILTER(0x%.4X) Key -> Proto(0x%.4X) -> IpProto(%d) ->UDP(s:%d, d:%d)\n", signal_id, ntohs(ehdr->h_proto), ip_proto, srcport, dstport);
if (srcport == SLSI_DHCP_CLIENT_PORT || srcport == SLSI_DHCP_SERVER_PORT ||
dstport == SLSI_DHCP_CLIENT_PORT || dstport == SLSI_DHCP_SERVER_PORT) {
SLSI_DBG3_NODEV(SLSI_UDI, "FILTER(0x%.4X) Key -> Proto(0x%.4X) -> IpProto(%d) ->UDP(s:%d, d:%d) ALLOW\n", signal_id, ntohs(ehdr->h_proto), ip_proto, srcport, dstport);
return true;
}
}
default:
break;
}
return false;
}
static int udi_log_event(struct slsi_log_client *log_client, struct sk_buff *skb, int dir)
{
struct slsi_cdev_client *client = log_client->log_client_ctx;
struct udi_msg_t msg;
struct udi_msg_t *msg_skb;
u16 signal_id = fapi_get_sigid(skb);
if (WARN_ON(!client))
return -EINVAL;
if (WARN_ON(!skb))
return -EINVAL;
if (WARN_ON(skb->len == 0))
return -EINVAL;
/* Special Filtering of MaPacket frames */
if (slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_MASK) &&
(signal_id == MA_UNITDATA_REQ || signal_id == MA_UNITDATA_IND)) {
u16 frametype;
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X)\n", signal_id);
if (signal_id == MA_UNITDATA_REQ)
frametype = fapi_get_u16(skb, u.ma_unitdata_req.data_unit_descriptor);
else
frametype = fapi_get_u16(skb, u.ma_unitdata_ind.data_unit_descriptor);
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) frametype:%d\n", signal_id, frametype);
if (frametype == FAPI_DATAUNITDESCRIPTOR_IEEE802_3_FRAME) {
struct ethhdr *ehdr = (struct ethhdr *)fapi_get_data(skb);
if (signal_id == MA_UNITDATA_REQ)
ehdr = (struct ethhdr *)fapi_get_data(skb);
if (slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_EAPOL_ID) ||
slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_KEY_ID)) {
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) Eap -> Proto(0x%.4X)\n", signal_id, ntohs(ehdr->h_proto));
switch (ntohs(ehdr->h_proto)) {
case ETH_P_PAE:
case ETH_P_WAI:
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) Eap -> Proto(0x%.4X) ALLOW\n", signal_id, ntohs(ehdr->h_proto));
goto allow_frame;
default:
break;
}
}
if (slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_KEY_ID)) {
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) Key -> Proto(0x%.4X)\n", signal_id, ntohs(ehdr->h_proto));
switch (ntohs(ehdr->h_proto)) {
case ETH_P_ARP:
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) Key -> Proto(0x%.4X) -> Arp ALLOW\n", signal_id, ntohs(ehdr->h_proto));
goto allow_frame;
case ETH_P_IP:
if (is_allowed_ip_frame(ehdr, signal_id))
goto allow_frame;
default:
break;
}
}
}
if (frametype == FAPI_DATAUNITDESCRIPTOR_IEEE802_11_FRAME)
if (slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_MGT_ID))
if (ieee80211_is_mgmt(fapi_get_mgmt(skb)->frame_control))
goto allow_frame;
SLSI_DBG4_NODEV(SLSI_UDI, "FILTER(0x%.4X) DROP\n", signal_id);
if (down_interruptible(&client->log_mutex)) {
SLSI_WARN_NODEV("Failed to get udi sem\n");
return -ERESTARTSYS;
}
if (client->log_drop_data_packets)
client->log_dropped_data++;
up(&client->log_mutex);
return -ECANCELED;
}
/* Special Filtering of MaPacketCfm.
* Only log ma_packet_cfm if the tx status != Success
*/
if (signal_id == MA_UNITDATA_CFM && slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_CFM_ERROR_ID))
if (fapi_get_u16(skb, u.ma_unitdata_cfm.transmission_status) == FAPI_TRANSMISSIONSTATUS_SUCCESSFUL)
return -ECANCELED;
/* Exception for driver configuration frames.
* these frames must be sent irrespective of number of frames
* in queue.
*/
if (dir == UDI_CONFIG_IND)
goto allow_config_frame;
allow_frame:
if (down_interruptible(&client->log_mutex)) {
SLSI_WARN_NODEV("Failed to get udi sem\n");
return -ERESTARTSYS;
}
/* Handle hitting the UDI_MAX_QUEUED_FRAMES Limit */
if (client->log_dropped) {
if (skb_queue_len(&client->log_list) <= UDI_RESTART_QUEUED_FRAMES) {
u32 dropped = client->log_dropped;
SLSI_WARN_NODEV("Stop Dropping UDI Frames : %d frames Dropped\n", dropped);
client->log_dropped = 0;
up(&client->log_mutex);
slsi_kernel_to_user_space_event(log_client, UDI_DRV_DROPPED_FRAMES, sizeof(u32), (u8 *)&dropped);
return -ECANCELED;
}
client->log_dropped++;
up(&client->log_mutex);
return -ECANCELED;
} else if (!client->log_dropped && skb_queue_len(&client->log_list) >= UDI_MAX_QUEUED_FRAMES) {
SLSI_WARN_NODEV("Start Dropping UDI Frames\n");
client->log_dropped++;
up(&client->log_mutex);
return -ECANCELED;
}
/* Handle hitting the UDI_MAX_QUEUED_DATA_FRAMES Limit
* Turn ON the MA_PACKET Filters before we get near the absolute limit of UDI_MAX_QUEUED_FRAMES
* This should allow key frames (mgt, dhcp and eapol etc) to still be in the logs but stop the logging general data frames.
* This occurs when the Transfer rate is higher than we can take the frames out of the UDI list.
*/
if (client->log_drop_data_packets && skb_queue_len(&client->log_list) < UDI_RESTART_QUEUED_DATA_FRAMES) {
u32 dropped = client->log_dropped_data;
SLSI_WARN_NODEV("Stop Dropping UDI Frames : %d Basic Data frames Dropped\n", client->log_dropped_data);
client->log_drop_data_packets = false;
client->ma_unitdata_filter_config = 0;
client->log_dropped_data = 0;
up(&client->log_mutex);
slsi_kernel_to_user_space_event(log_client, UDI_DRV_DROPPED_DATA_FRAMES, sizeof(u32), (u8 *)&dropped);
return -ECANCELED;
} else if (!client->log_drop_data_packets && skb_queue_len(&client->log_list) >= UDI_MAX_QUEUED_DATA_FRAMES && !slsi_cdev_unitdata_filter_allow(client, UDI_MA_UNITDATA_FILTER_ALLOW_MASK)) {
SLSI_WARN_NODEV("Start Dropping UDI Basic Data Frames\n");
client->log_drop_data_packets = true;
client->ma_unitdata_filter_config = UDI_MA_UNITDATA_FILTER_ALLOW_MGT_ID |
UDI_MA_UNITDATA_FILTER_ALLOW_KEY_ID |
UDI_MA_UNITDATA_FILTER_ALLOW_CFM_ERROR_ID |
UDI_MA_UNITDATA_FILTER_ALLOW_EAPOL_ID;
}
up(&client->log_mutex);
allow_config_frame:
if ((signal_id == MA_UNITDATA_REQ || signal_id == MA_UNITDATA_IND) &&
(client->ma_unitdata_size_limit) && (skb->len > client->ma_unitdata_size_limit)) {
struct slsi_skb_cb *cb;
struct sk_buff *skb2 = alloc_skb(sizeof(msg) + client->ma_unitdata_size_limit, GFP_ATOMIC);
if (WARN_ON(!skb2))
return -ENOMEM;
skb_reserve(skb2, sizeof(msg));
cb = slsi_skb_cb_init(skb2);
cb->sig_length = fapi_get_siglen(skb);
cb->data_length = client->ma_unitdata_size_limit;
skb_copy_bits(skb, 0, skb_put(skb2, client->ma_unitdata_size_limit), client->ma_unitdata_size_limit);
skb = skb2;
} else {
skb = skb_copy_expand(skb, sizeof(msg), 0, GFP_ATOMIC);
if (WARN_ON(!skb))
return -ENOMEM;
}
msg.length = sizeof(msg) + skb->len;
msg.timestamp = ktime_to_ms(ktime_get());
msg.direction = dir;
msg.signal_length = fapi_get_siglen(skb);
msg_skb = (struct udi_msg_t *)skb_push(skb, sizeof(msg));
*msg_skb = msg;
skb_queue_tail(&client->log_list, skb);
/* Wake any waiting user process */
wake_up_interruptible(&client->log_wq);
return 0;
}
#define UF_DEVICE_CREATE(_class, _parent, _devno, _priv, _fmt, _args) \
device_create(_class, _parent, _devno, _priv, _fmt, _args)
static const struct file_operations slsi_cdev_fops = {
.owner = THIS_MODULE,
.open = slsi_cdev_open,
.release = slsi_cdev_release,
.read = slsi_cdev_read,
.write = slsi_cdev_write,
.unlocked_ioctl = slsi_cdev_ioctl,
.compat_ioctl = slsi_cdev_ioctl,
.poll = slsi_cdev_poll,
};
#define UF_DEVICE_CREATE(_class, _parent, _devno, _priv, _fmt, _args) \
device_create(_class, _parent, _devno, _priv, _fmt, _args)
#ifndef SLSI_TEST_DEV
static int slsi_get_minor(void)
{
int minor;
for (minor = 0; minor < SLSI_UDI_MINOR_NODES; minor++)
if (!uf_cdevs[minor])
return minor;
return -1;
}
#endif
static int slsi_cdev_create(struct slsi_dev *sdev, struct device *parent)
{
dev_t devno;
int ret;
struct slsi_cdev *pdev;
int minor;
SLSI_DBG3_NODEV(SLSI_UDI, "\n");
#ifdef SLSI_TEST_DEV
{
/* Use the same minor as the unittesthip char device so the number match */
struct slsi_test_dev *uftestdev = (struct slsi_test_dev *)sdev->maxwell_core;
minor = uftestdev->device_minor_number;
if (minor >= 0 && minor < SLSI_UDI_MINOR_NODES && uf_cdevs[minor])
return -EINVAL;
}
#else
minor = slsi_get_minor();
#endif
if (minor >= SLSI_UDI_MINOR_NODES || minor < 0) {
SLSI_ERR(sdev, "no minor numbers available,minor:%d\n", minor);
return -ENOMEM;
}
pdev = kmalloc(sizeof(*pdev), GFP_KERNEL);
if (!pdev)
return -ENOMEM;
memset(pdev, 0, sizeof(*pdev));
cdev_init(&pdev->cdev, &slsi_cdev_fops);
pdev->cdev.owner = THIS_MODULE;
pdev->minor = minor;
devno = MKDEV(MAJOR(major_number), minor);
ret = cdev_add(&pdev->cdev, devno, 1);
if (ret) {
SLSI_ERR(sdev, "cdev_add failed with %d for minor %d\n", ret, minor);
kfree(pdev);
return ret;
}
pdev->sdev = sdev;
pdev->parent = parent;
if (!UF_DEVICE_CREATE(class, pdev->parent, devno, pdev, UDI_CHAR_DEVICE_NAME "%d", minor)) {
cdev_del(&pdev->cdev);
kfree(pdev);
return -EINVAL;
}
sdev->uf_cdev = (void *)pdev;
sdev->procfs_instance = minor;
uf_cdevs[minor] = pdev;
return 0;
}
static void slsi_cdev_destroy(struct slsi_dev *sdev)
{
struct slsi_cdev *pdev = (struct slsi_cdev *)sdev->uf_cdev;
struct kobject *kobj;
struct kref *kref;
if (!pdev)
return;
SLSI_DBG1(sdev, SLSI_UDI, "\n");
while (slsi_check_cdev_refs()) {
SLSI_ERR(sdev, "UDI Client still attached. Please Terminate!\n");
msleep(1000);
}
/* There exist a possibility of race such that the
*
* - file operation release callback (slsi_cdev_release) is called
* - the cdev client structure is freed
* - the context is pre-empted and this context (slsi_cdev_destroy) is executed
* - slsi_cdev_destroy deletes cdev and hence the kobject embedded inside cdev
* and returns
* - the release context again executes and operates on a non-existent kobject
* leading to kernel Panic
*
* Ideally the kernel should protect against such race. But it is not!
* So we check here that the file operation release callback is complete by
* checking the refcount in the kobject embedded in cdev structure.
* The refcount is initialized to 1; so anything more than that means
* there exists attached clients.
*/
kobj = &pdev->cdev.kobj;
kref = &kobj->kref;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0))
while (refcount_read(&kref->refcount) > 1) {
SLSI_WARN(sdev, "UDI client File op release not completed yet! (count=%d)\n", refcount_read(&kref->refcount));
msleep(50);
}
#else
while (atomic_read(&kref->refcount) > 1) {
SLSI_WARN(sdev, "UDI client File op release not completed yet! (count=%d)\n", atomic_read(&kref->refcount));
msleep(50);
}
#endif
device_destroy(class, pdev->cdev.dev);
cdev_del(&pdev->cdev);
sdev->uf_cdev = NULL;
uf_cdevs[pdev->minor] = NULL;
kfree(pdev);
}
static int udi_initialised;
int slsi_udi_init(void)
{
int ret;
SLSI_DBG1_NODEV(SLSI_UDI, "\n");
memset(uf_cdevs, 0, sizeof(uf_cdevs));
/* Allocate two device numbers for each device. */
ret = alloc_chrdev_region(&major_number, 0, SLSI_UDI_MINOR_NODES, UDI_CLASS_NAME);
if (ret) {
SLSI_ERR_NODEV("Failed to add alloc dev numbers: %d\n", ret);
return ret;
}
/* Create a driver class */
class = class_create(THIS_MODULE, UDI_CLASS_NAME);
if (IS_ERR(class)) {
SLSI_ERR_NODEV("Failed to create driver udi class\n");
unregister_chrdev_region(major_number, SLSI_UDI_MINOR_NODES);
major_number = 0;
return -EINVAL;
}
udi_initialised = 1;
return 0;
}
int slsi_udi_deinit(void)
{
if (!udi_initialised)
return -1;
SLSI_DBG1_NODEV(SLSI_UDI, "\n");
class_destroy(class);
unregister_chrdev_region(major_number, SLSI_UDI_MINOR_NODES);
udi_initialised = 0;
return 0;
}
int slsi_udi_node_init(struct slsi_dev *sdev, struct device *parent)
{
return slsi_cdev_create(sdev, parent);
}
int slsi_udi_node_deinit(struct slsi_dev *sdev)
{
slsi_cdev_destroy(sdev);
return 0;
}
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