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cfg80211: move cookie_counter out of wiphy 

There's no reason for drivers to be able to access the
cfg80211 internal cookie counter; move it out of the
wiphy into the rdev structure.

While at it, also make it never assign 0 as a cookie
(we consider that invalid in some places), and warn if
we manage to do that for some reason (wrapping is not
likely to happen with a u64.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2018-10-01 11:52:07 +02:00
parent 71e5e88680
commit b60ad34851
3 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/cfg80211.h
View File

@ -4012,7 +4012,6 @@ struct wiphy_iftype_ext_capab {
* by the driver in the .connect() callback. The bit position maps to the
* attribute indices defined in &enum nl80211_bss_select_attr.
*
* @cookie_counter: unique generic cookie counter, used to identify objects.
* @nan_supported_bands: bands supported by the device in NAN mode, a
* bitmap of &enum nl80211_band values. For instance, for
* NL80211_BAND_2GHZ, bit 0 would be set
@ -4151,8 +4150,6 @@ struct wiphy {
u32 bss_select_support;
u64 cookie_counter;
u8 nan_supported_bands;
u32 txq_limit;

11
net/wireless/core.h
View File

@ -66,6 +66,7 @@ struct cfg80211_registered_device {
/* protected by RTNL only */
int num_running_ifaces;
int num_running_monitor_ifaces;
u64 cookie_counter;
/* BSSes/scanning */
spinlock_t bss_lock;
@ -133,6 +134,16 @@ cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
#endif
}
static inline u64 cfg80211_assign_cookie(struct cfg80211_registered_device *rdev)
{
u64 r = ++rdev->cookie_counter;
if (WARN_ON(r == 0))
r = ++rdev->cookie_counter;
return r;
}
extern struct workqueue_struct *cfg80211_wq;
extern struct list_head cfg80211_rdev_list;
extern int cfg80211_rdev_list_generation;

4
net/wireless/nl80211.c
View File

@ -7803,7 +7803,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
*/
if (want_multi && rdev->wiphy.max_sched_scan_reqs > 1) {
while (!sched_scan_req->reqid)
sched_scan_req->reqid = rdev->wiphy.cookie_counter++;
sched_scan_req->reqid = cfg80211_assign_cookie(rdev);
}
err = rdev_sched_scan_start(rdev, dev, sched_scan_req);
@ -11798,7 +11798,7 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
if (!func)
return -ENOMEM;
func->cookie = wdev->wiphy->cookie_counter++;
func->cookie = cfg80211_assign_cookie(rdev);
if (!tb[NL80211_NAN_FUNC_TYPE] ||
nla_get_u8(tb[NL80211_NAN_FUNC_TYPE]) > NL80211_NAN_FUNC_MAX_TYPE) {