diff options
| author |   Johannes Berg <johannes.berg@intel.com> | 2018-10-01 11:52:07 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2018-10-02 09:58:36 +0200 |
| commit | b60ad3485106b5845113e7a2745abb7e64b15d6d (patch) | |
| tree | 1edbb0fdc3876e3a34103056a20d39ad3460bead /net/wireless | |
| parent | cfg80211: regulatory: make initialization more robust (diff) | |
| download | linux-dev-b60ad3485106b5845113e7a2745abb7e64b15d6d.tar.xz linux-dev-b60ad3485106b5845113e7a2745abb7e64b15d6d.zip | |
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>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/core.h | 11 | ||||
| -rw-r--r-- | net/wireless/nl80211.c | 4 |
2 files changed, 13 insertions, 2 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h index 45fd4e21dbda..c61dbba8bf47 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -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; diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 8f962c79987a..60ce2eb57fbb 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -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) { |