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cfg80211: add channel checking for iface combinations 

.connect cannot be handled since the driver scans
and connects on its own. It is up to the driver
then to refuse a connection (with -EBUSY for
example).

Non-fixed channel IBSSes always take a single
channel resource. For example two non-fixed
channel IBSSes always take up 2
num_different_channels, even if they operate on
the same channel at a given point of time.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior 2012-06-29 12:47:07 +02:00 committed by Johannes Berg
parent 2e165b8184
commit d4e50c5917
3 changed files with 88 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/wireless/core.c
View File

@ -373,6 +373,14 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
if (WARN_ON(!c->num_different_channels))
return -EINVAL;
/*
* Put a sane limit on maximum number of different
* channels to simplify channel accounting code.
*/
if (WARN_ON(c->num_different_channels >
CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
return -EINVAL;
if (WARN_ON(!c->n_limits))
return -EINVAL;

29
net/wireless/core.h
View File

@ -428,9 +428,20 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
u32 *flags, struct vif_params *params);
void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype);
int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan,
enum cfg80211_chan_mode chanmode);
static inline int
cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype)
{
return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
CHAN_MODE_UNDEFINED);
}
static inline int
cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
@ -439,6 +450,16 @@ cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
return cfg80211_can_change_interface(rdev, NULL, iftype);
}
static inline int
cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct ieee80211_channel *chan,
enum cfg80211_chan_mode chanmode)
{
return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
chan, chanmode);
}
void
cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
@ -461,6 +482,8 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype, int num);
#define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
#ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
#define CFG80211_DEV_WARN_ON(cond) WARN_ON(cond)
#else

59
net/wireless/util.c
View File

@ -938,13 +938,20 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
return res;
}
int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype)
int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan,
enum cfg80211_chan_mode chanmode)
{
struct wireless_dev *wdev_iter;
u32 used_iftypes = BIT(iftype);
int num[NUM_NL80211_IFTYPES];
struct ieee80211_channel
*used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
struct ieee80211_channel *ch;
enum cfg80211_chan_mode chmode;
int num_different_channels = 0;
int total = 1;
int i, j;
@ -955,9 +962,23 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
return 0;
memset(num, 0, sizeof(num));
memset(used_channels, 0, sizeof(used_channels));
num[iftype] = 1;
switch (chanmode) {
case CHAN_MODE_UNDEFINED:
break;
case CHAN_MODE_SHARED:
WARN_ON(!chan);
used_channels[0] = chan;
num_different_channels++;
break;
case CHAN_MODE_EXCLUSIVE:
num_different_channels++;
break;
}
mutex_lock(&rdev->devlist_mtx);
list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
if (wdev_iter == wdev)
@ -968,6 +989,31 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
continue;
cfg80211_get_chan_state(rdev, wdev_iter, &ch, &chmode);
switch (chmode) {
case CHAN_MODE_UNDEFINED:
break;
case CHAN_MODE_SHARED:
for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
if (!used_channels[i] || used_channels[i] == ch)
break;
if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
mutex_unlock(&rdev->devlist_mtx);
return -EBUSY;
}
if (used_channels[i] == NULL) {
used_channels[i] = ch;
num_different_channels++;
}
break;
case CHAN_MODE_EXCLUSIVE:
num_different_channels++;
break;
}
num[wdev_iter->iftype]++;
total++;
used_iftypes |= BIT(wdev_iter->iftype);
@ -984,12 +1030,15 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
c = &rdev->wiphy.iface_combinations[i];
if (total > c->max_interfaces)
continue;
if (num_different_channels > c->num_different_channels)
continue;
limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
GFP_KERNEL);
if (!limits)
return -ENOMEM;
if (total > c->max_interfaces)
goto cont;
for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
if (rdev->wiphy.software_iftypes & BIT(iftype))