/*********************************************************************************************************
** 函数名称: ioctl_private_iw_point
** 功能描述: ioctl priv
** 输 入 :
** 输 出 : OK or ERROR
** 全局变量:
** 调用模块:
*********************************************************************************************************/
static int ioctl_private_iw_point (struct iw_point *iwp, unsigned int cmd,
const struct iw_priv_args *descr,
iw_handler handler, struct netif *dev,
struct iw_request_info *info, int extra_size)
{
char *extra;
int err;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
if (!iwp->pointer && iwp->length != 0) {
return (-EFAULT);
}
if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK)) {
return (-E2BIG);
}
} else if (!iwp->pointer) {
return (-EFAULT);
}
extra = kzalloc(extra_size, GFP_KERNEL);
if (!extra) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
if (copy_from_user(extra, iwp->pointer, extra_size)) {
err = -EFAULT;
goto out;
}
}
/* Call the handler */
err = handler(dev, info, (union iwreq_data *) iwp, extra);
/* If we have something to return to the user */
if (!err && IW_IS_GET(cmd)) {
/* Adjust for the actual length if it's variable,
* avoid leaking kernel bits outside.
*/
if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
extra_size = adjust_priv_size(descr->get_args, iwp);
}
if (copy_to_user(iwp->pointer, extra, extra_size)) {
err = -EFAULT;
}
}
out:
kfree(extra);
return (err);
}
/*********************************************************************************************************
** 函数名称: get_priv_descr_and_size
** 功能描述: Wrapper to call a private Wireless Extension handler.
** 输 入 :
** 输 出 : OK or ERROR
** 全局变量:
** 调用模块:
*********************************************************************************************************/
static int get_priv_descr_and_size (struct netif *dev, unsigned int cmd,
const struct iw_priv_args **descrp)
{
const struct iw_priv_args *descr;
int i, extra_size;
struct iw_handler_def *handlers = (struct iw_handler_def *)dev->wireless_handlers;
if (!handlers) {
return (-EOPNOTSUPP);
}
descr = NULL;
for (i = 0; i < handlers->num_private_args; i++) {
if (cmd == handlers->private_args[i].cmd) {
descr = &handlers->private_args[i];
break;
}
}
extra_size = 0;
if (descr) {
if (IW_IS_SET(cmd)) {
int offset = 0; /* For sub-ioctls */
/* Check for sub-ioctl handler */
if (descr->name[0] == '\0') {
/* Reserve one int for sub-ioctl index */
offset = sizeof(u32);
}
/* Size of set arguments */
extra_size = get_priv_size(descr->set_args);
/* Does it fits in iwr ? */
if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
((extra_size + offset) <= IFNAMSIZ)) {
extra_size = 0;
}
} else {
/* Size of get arguments */
extra_size = get_priv_size(descr->get_args);
/* Does it fits in iwr ? */
if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
(extra_size <= IFNAMSIZ)) {
extra_size = 0;
}
}
}
*descrp = descr;
return (extra_size);
}
static io_return_t
device_set_status(void *d, dev_flavor_t flavor, dev_status_t status,
mach_msg_type_number_t count)
{
if (flavor == NET_FLAGS)
{
if (count != 1)
return D_INVALID_SIZE;
short flags = status[0];
struct net_data *net = (struct net_data *) d;
dev_change_flags (net->dev, flags);
/* Change the flags of the Mach device, too. */
net->ifnet.if_flags = net->dev->flags;
return D_SUCCESS;
}
if(flavor < SIOCIWFIRST || flavor > SIOCIWLAST)
return D_INVALID_OPERATION;
if(! IW_IS_SET(flavor))
return D_INVALID_OPERATION;
if(count * sizeof(int) < sizeof(struct ifreq))
return D_INVALID_OPERATION;
struct net_data *nd = d;
struct linux_device *dev = nd->dev;
if(! dev->do_ioctl)
return D_INVALID_OPERATION;
if((flavor == SIOCSIWENCODE || flavor == SIOCSIWESSID
|| flavor == SIOCSIWNICKN || flavor == SIOCSIWSPY)
&& ((struct iwreq *) status)->u.data.pointer)
{
struct iw_point *iwp = &((struct iwreq *) status)->u.data;
/* safety check whether the status array is long enough ... */
if(count * sizeof(int) < sizeof(struct ifreq) + iwp->length)
return D_INVALID_OPERATION;
/* make sure, iwp->pointer points to the correct address */
if(iwp->pointer) iwp->pointer = (void *) status + sizeof(struct ifreq);
}
int result = dev->do_ioctl(dev, (struct ifreq *) status, flavor);
return result ? D_IO_ERROR : D_SUCCESS;
}
/* entry point from dev ioctl */
int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
void __user *arg)
{
int ret;
/* If command is `set a parameter', or
* `get the encoding parameters', check if
* the user has the right to do it */
if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
&& !capable(CAP_NET_ADMIN))
return -EPERM;
dev_load(net, ifr->ifr_name);
rtnl_lock();
ret = wireless_process_ioctl(net, ifr, cmd);
rtnl_unlock();
if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq)))
return -EFAULT;
return ret;
}
static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
const struct iw_ioctl_description *descr,
iw_handler handler, struct net_device *dev,
struct iw_request_info *info)
{
int err, extra_size, user_length = 0, essid_compat = 0;
char *extra;
/* Calculate space needed by arguments. Always allocate
* for max space.
*/
extra_size = descr->max_tokens * descr->token_size;
/* Check need for ESSID compatibility for WE < 21 */
switch (cmd) {
case SIOCSIWESSID:
case SIOCGIWESSID:
case SIOCSIWNICKN:
case SIOCGIWNICKN:
if (iwp->length == descr->max_tokens + 1)
essid_compat = 1;
else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
char essid[IW_ESSID_MAX_SIZE + 1];
unsigned int len;
len = iwp->length * descr->token_size;
if (len > IW_ESSID_MAX_SIZE)
return -EFAULT;
err = copy_from_user(essid, iwp->pointer, len);
if (err)
return -EFAULT;
if (essid[iwp->length - 1] == '\0')
essid_compat = 1;
}
break;
default:
break;
}
iwp->length -= essid_compat;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
/* Check NULL pointer */
if (!iwp->pointer && iwp->length != 0)
return -EFAULT;
/* Check if number of token fits within bounds */
if (iwp->length > descr->max_tokens)
return -E2BIG;
if (iwp->length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if (!iwp->pointer)
return -EFAULT;
/* Save user space buffer size for checking */
user_length = iwp->length;
/* Don't check if user_length > max to allow forward
* compatibility. The test user_length < min is
* implied by the test at the end.
*/
/* Support for very large requests */
if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
(user_length > descr->max_tokens)) {
/* Allow userspace to GET more than max so
* we can support any size GET requests.
* There is still a limit : -ENOMEM.
*/
extra_size = user_length * descr->token_size;
/* Note : user_length is originally a __u16,
* and token_size is controlled by us,
* so extra_size won't get negative and
* won't overflow...
*/
}
}
/* kzalloc() ensures NULL-termination for essid_compat. */
extra = kzalloc(extra_size, GFP_KERNEL);
if (!extra)
return -ENOMEM;
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
if (copy_from_user(extra, iwp->pointer,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
if (cmd == SIOCSIWENCODEEXT) {
struct iw_encode_ext *ee = (void *) extra;
if (iwp->length < sizeof(*ee) + ee->key_len)
return -EFAULT;
}
}
if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
/*
* If this is a GET, but not NOMAX, it means that the extra
* data is not bounded by userspace, but by max_tokens. Thus
* set the length to max_tokens. This matches the extra data
* allocation.
* The driver should fill it with the number of tokens it
* provided, and it may check iwp->length rather than having
* knowledge of max_tokens. If the driver doesn't change the
* iwp->length, this ioctl just copies back max_token tokens
* filled with zeroes. Hopefully the driver isn't claiming
* them to be valid data.
*/
iwp->length = descr->max_tokens;
}
err = handler(dev, info, (union iwreq_data *) iwp, extra);
iwp->length += essid_compat;
/* If we have something to return to the user */
if (!err && IW_IS_GET(cmd)) {
/* Check if there is enough buffer up there */
if (user_length < iwp->length) {
err = -E2BIG;
goto out;
}
if (copy_to_user(iwp->pointer, extra,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
}
/* Generate an event to notify listeners of the change */
if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
((err == 0) || (err == -EIWCOMMIT))) {
union iwreq_data *data = (union iwreq_data *) iwp;
if (descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload.
*/
wireless_send_event(dev, cmd, data, NULL);
else
wireless_send_event(dev, cmd, data, extra);
}
out:
kfree(extra);
return err;
}
/*
* Wrapper to call a private Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
* It's not as nice and slimline as the standard wrapper. The cause
* is struct iw_priv_args, which was not really designed for the
* job we are going here.
*
* IMPORTANT : This function prevent to set and get data on the same
* IOCTL and enforce the SET/GET convention. Not doing it would be
* far too hairy...
* If you need to set and get data at the same time, please don't use
* a iw_handler but process it in your ioctl handler (i.e. use the
* old driver API).
*/
static inline int ioctl_private_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
struct iw_priv_args * descr = NULL;
struct iw_request_info info;
int extra_size = 0;
int i;
int ret = -EINVAL;
/* Get the description of the IOCTL */
for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
if(cmd == dev->wireless_handlers->private_args[i].cmd) {
descr = &(dev->wireless_handlers->private_args[i]);
break;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
ifr->ifr_name, cmd);
if(descr) {
printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
dev->name, descr->name,
descr->set_args, descr->get_args);
}
#endif /* WE_IOCTL_DEBUG */
/* Compute the size of the set/get arguments */
if(descr != NULL) {
if(IW_IS_SET(cmd)) {
int offset = 0; /* For sub-ioctls */
/* Check for sub-ioctl handler */
if(descr->name[0] == '\0')
/* Reserve one int for sub-ioctl index */
offset = sizeof(__u32);
/* Size of set arguments */
extra_size = get_priv_size(descr->set_args);
/* Does it fits in iwr ? */
if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
((extra_size + offset) <= IFNAMSIZ))
extra_size = 0;
} else {
/* Size of set arguments */
extra_size = get_priv_size(descr->get_args);
/* Does it fits in iwr ? */
if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
(extra_size <= IFNAMSIZ))
extra_size = 0;
}
}
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not. */
if(extra_size == 0) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
} else {
char * extra;
int err;
/* Check what user space is giving us */
if(IW_IS_SET(cmd)) {
/* Check NULL pointer */
if((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Does it fits within bounds ? */
if(iwr->u.data.length > (descr->set_args &
IW_PRIV_SIZE_MASK))
return -E2BIG;
} else {
/* Check NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
dev->name, extra_size);
#endif /* WE_IOCTL_DEBUG */
/* Always allocate for max space. Easier, and won't last
* long... */
extra = kmalloc(extra_size, GFP_KERNEL);
if (extra == NULL) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
extra_size);
if (err) {
kfree(extra);
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
dev->name, iwr->u.data.length);
#endif /* WE_IOCTL_DEBUG */
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
err = copy_to_user(iwr->u.data.pointer, extra,
extra_size);
if (err)
ret = -EFAULT;
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
dev->name, iwr->u.data.length);
#endif /* WE_IOCTL_DEBUG */
}
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if(ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
return ret;
}
/*
* Wrapper to call a standard Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
*/
static inline int ioctl_standard_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
const struct iw_ioctl_description * descr;
struct iw_request_info info;
int ret = -EINVAL;
int user_size = 0;
/* Get the description of the IOCTL */
if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
return -EOPNOTSUPP;
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
ifr->ifr_name, cmd);
printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
#endif /* WE_IOCTL_DEBUG */
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not */
if(descr->header_type != IW_HEADER_TYPE_POINT) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), NULL);
#ifdef WE_SET_EVENT
/* Generate an event to notify listeners of the change */
if((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT)))
wireless_send_event(dev, cmd, &(iwr->u), NULL);
#endif /* WE_SET_EVENT */
} else {
char * extra;
int err;
/* Check what user space is giving us */
if(IW_IS_SET(cmd)) {
/* Check NULL pointer */
if((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Check if number of token fits within bounds */
if(iwr->u.data.length > descr->max_tokens)
return -E2BIG;
if(iwr->u.data.length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
/* Save user space buffer size for checking */
user_size = iwr->u.data.length;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
dev->name, descr->max_tokens * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
/* Always allocate for max space. Easier, and won't last
* long... */
extra = kmalloc(descr->max_tokens * descr->token_size,
GFP_KERNEL);
if (extra == NULL) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
iwr->u.data.length *
descr->token_size);
if (err) {
kfree(extra);
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
dev->name,
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
#ifdef WE_STRICT_WRITE
/* Check if there is enough buffer up there */
if(user_size < iwr->u.data.length) {
printk(KERN_ERR "%s (WE) : Buffer for request %04X too small (%d<%d)\n", dev->name, cmd, user_size, iwr->u.data.length);
kfree(extra);
return -E2BIG;
}
#endif /* WE_STRICT_WRITE */
err = copy_to_user(iwr->u.data.pointer, extra,
iwr->u.data.length *
descr->token_size);
if (err)
ret = -EFAULT;
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
dev->name,
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
#ifdef WE_SET_EVENT
/* Generate an event to notify listeners of the change */
if((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT))) {
if(descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload */
wireless_send_event(dev, cmd, &(iwr->u), NULL);
else
wireless_send_event(dev, cmd, &(iwr->u),
extra);
}
#endif /* WE_SET_EVENT */
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if(ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
/* Here, we will generate the appropriate event if needed */
return ret;
}
/*
* Wrapper to call a standard Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
*/
static int ioctl_standard_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
const struct iw_ioctl_description * descr;
struct iw_request_info info;
int ret = -EINVAL;
/* Get the description of the IOCTL */
if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
return -EOPNOTSUPP;
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not */
if (descr->header_type != IW_HEADER_TYPE_POINT) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), NULL);
/* Generate an event to notify listeners of the change */
if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT)))
wireless_send_event(dev, cmd, &(iwr->u), NULL);
} else {
char * extra;
int extra_size;
int user_length = 0;
int err;
int essid_compat = 0;
/* Calculate space needed by arguments. Always allocate
* for max space. Easier, and won't last long... */
extra_size = descr->max_tokens * descr->token_size;
/* Check need for ESSID compatibility for WE < 21 */
switch (cmd) {
case SIOCSIWESSID:
case SIOCGIWESSID:
case SIOCSIWNICKN:
case SIOCGIWNICKN:
if (iwr->u.data.length == descr->max_tokens + 1)
essid_compat = 1;
else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
char essid[IW_ESSID_MAX_SIZE + 1];
err = copy_from_user(essid, iwr->u.data.pointer,
iwr->u.data.length *
descr->token_size);
if (err)
return -EFAULT;
if (essid[iwr->u.data.length - 1] == '\0')
essid_compat = 1;
}
break;
default:
break;
}
iwr->u.data.length -= essid_compat;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
/* Check NULL pointer */
if ((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Check if number of token fits within bounds */
if (iwr->u.data.length > descr->max_tokens)
return -E2BIG;
if (iwr->u.data.length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if (iwr->u.data.pointer == NULL)
return -EFAULT;
/* Save user space buffer size for checking */
user_length = iwr->u.data.length;
/* Don't check if user_length > max to allow forward
* compatibility. The test user_length < min is
* implied by the test at the end. */
/* Support for very large requests */
if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
(user_length > descr->max_tokens)) {
/* Allow userspace to GET more than max so
* we can support any size GET requests.
* There is still a limit : -ENOMEM. */
extra_size = user_length * descr->token_size;
/* Note : user_length is originally a __u16,
* and token_size is controlled by us,
* so extra_size won't get negative and
* won't overflow... */
}
}
/* Create the kernel buffer */
/* kzalloc ensures NULL-termination for essid_compat */
extra = kzalloc(extra_size, GFP_KERNEL);
if (extra == NULL)
return -ENOMEM;
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
iwr->u.data.length *
descr->token_size);
if (err) {
kfree(extra);
return -EFAULT;
}
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
iwr->u.data.length += essid_compat;
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
/* Check if there is enough buffer up there */
if (user_length < iwr->u.data.length) {
kfree(extra);
return -E2BIG;
}
err = copy_to_user(iwr->u.data.pointer, extra,
iwr->u.data.length *
descr->token_size);
if (err)
ret = -EFAULT;
}
/* Generate an event to notify listeners of the change */
if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT))) {
if (descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload */
wireless_send_event(dev, cmd, &(iwr->u), NULL);
else
wireless_send_event(dev, cmd, &(iwr->u),
extra);
}
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if (ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
/* Here, we will generate the appropriate event if needed */
return ret;
}
/* ---------------------------------------------------------------- */
static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
const struct iw_ioctl_description *descr,
iw_handler handler, struct net_device *dev,
struct iw_request_info *info)
{
int err, extra_size, user_length = 0;
char *extra;
/* Calculate space needed by arguments. Always allocate
* for max space.
*/
extra_size = descr->max_tokens * descr->token_size;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
/* Check NULL pointer */
if (!iwp->pointer && iwp->length != 0)
return -EFAULT;
/* Check if number of token fits within bounds */
if (iwp->length > descr->max_tokens)
return -E2BIG;
if (iwp->length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if (!iwp->pointer)
return -EFAULT;
/* Save user space buffer size for checking */
user_length = iwp->length;
/* Don't check if user_length > max to allow forward
* compatibility. The test user_length < min is
* implied by the test at the end.
*/
/* Support for very large requests */
if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
(user_length > descr->max_tokens)) {
/* Allow userspace to GET more than max so
* we can support any size GET requests.
* There is still a limit : -ENOMEM.
*/
extra_size = user_length * descr->token_size;
/* Note : user_length is originally a __u16,
* and token_size is controlled by us,
* so extra_size won't get negative and
* won't overflow...
*/
}
}
extra = kzalloc(extra_size, GFP_KERNEL);
if (!extra)
return -ENOMEM;
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
if (copy_from_user(extra, iwp->pointer,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
if (cmd == SIOCSIWENCODEEXT) {
struct iw_encode_ext *ee = (void *) extra;
if (iwp->length < sizeof(*ee) + ee->key_len)
return -EFAULT;
}
}
err = handler(dev, info, (union iwreq_data *) iwp, extra);
/* If we have something to return to the user */
if (!err && IW_IS_GET(cmd)) {
/* Check if there is enough buffer up there */
if (user_length < iwp->length) {
err = -E2BIG;
goto out;
}
if (copy_to_user(iwp->pointer, extra,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
}
/* Generate an event to notify listeners of the change */
if ((descr->flags & IW_DESCR_FLAG_EVENT) && err == -EIWCOMMIT) {
union iwreq_data *data = (union iwreq_data *) iwp;
if (descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload.
*/
wireless_send_event(dev, cmd, data, NULL);
else
wireless_send_event(dev, cmd, data, extra);
}
out:
kfree(extra);
return err;
}
/*
* Wrapper to call a standard Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
*/
static inline int ioctl_standard_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
const struct iw_ioctl_description * descr;
struct iw_request_info info;
int ret = -EINVAL;
/* Get the description of the IOCTL */
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s : Found standard handler for 0x%04X\n",
ifr->ifr_name, cmd);
printk(KERN_DEBUG "Header type : %d, token type : %d, token_size : %d, max_token : %d\n", descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
#endif /* WE_IOCTL_DEBUG */
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not */
if(descr->header_type != IW_HEADER_TYPE_POINT) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), NULL);
} else {
char * extra;
int err;
/* Check what user space is giving us */
if(IW_IS_SET(cmd)) {
/* Check NULL pointer */
if((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Check if number of token fits within bounds */
if(iwr->u.data.length > descr->max_tokens)
return -E2BIG;
if(iwr->u.data.length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
#ifdef WE_STRICT_WRITE
/* Check if there is enough buffer up there */
if(iwr->u.data.length < descr->max_tokens)
return -E2BIG;
#endif /* WE_STRICT_WRITE */
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "Malloc %d bytes\n",
descr->max_tokens * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
/* Always allocate for max space. Easier, and won't last
* long... */
extra = kmalloc(descr->max_tokens * descr->token_size,
GFP_KERNEL);
if (extra == NULL) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
iwr->u.data.length *
descr->token_size);
if (err) {
kfree(extra);
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "Got %d bytes\n",
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
err = copy_to_user(iwr->u.data.pointer, extra,
iwr->u.data.length *
descr->token_size);
if (err)
ret = -EFAULT;
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "Wrote %d bytes\n",
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if(ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
/* Here, we will generate the appropriate event if needed */
return ret;
}
int dev_ioctl(unsigned int cmd, void *arg)
{
switch(cmd)
{
case SIOCGIFCONF:
(void) dev_ifconf((char *) arg);
return 0;
/*
* Ioctl calls that can be done by all.
*/
case SIOCGIFFLAGS:
case SIOCGIFADDR:
case SIOCGIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCGIFMETRIC:
case SIOCGIFMTU:
case SIOCGIFMEM:
case SIOCGIFHWADDR:
case SIOCGIFSLAVE:
case SIOCGIFMAP:
return dev_ifsioc(arg, cmd);
/*
* Ioctl calls requiring the power of a superuser
*/
case SIOCSIFFLAGS:
case SIOCSIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFBRDADDR:
case SIOCSIFNETMASK:
case SIOCSIFMETRIC:
case SIOCSIFMTU:
case SIOCSIFMEM:
case SIOCSIFHWADDR:
case SIOCSIFMAP:
case SIOCSIFSLAVE:
case SIOCADDMULTI:
case SIOCDELMULTI:
if (!suser())
return -EPERM;
return dev_ifsioc(arg, cmd);
case SIOCSIFLINK:
return -EINVAL;
/*
* Unknown or private ioctl.
*/
default:
if((cmd >= SIOCDEVPRIVATE) &&
(cmd <= (SIOCDEVPRIVATE + 15))) {
return dev_ifsioc(arg, cmd);
}
#ifdef CONFIG_NET_RADIO
if((cmd >= SIOCIWFIRST) &&
(cmd <= SIOCIWLAST))
{
if((IW_IS_SET(cmd)) && (!suser()))
return -EPERM;
return dev_ifsioc(arg, cmd);
}
#endif /* CONFIG_NET_RADIO */
return -EINVAL;
}
}
