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nl/mac80211: allow zero plink timeout to disable STA expiration 

Both wpa_supplicant and mac80211 have and inactivity timer. By default
wpa_supplicant will be timed out in 5 minutes and mac80211's it is 30
minutes. If wpa_supplicant uses a longer timer than mac80211, it will
get unexpected disconnection by mac80211.

Using 0xffffffff instead as the configured value could solve this w/o
changing the code, but due to integer overflow in the expression used
this doesn't work. The expression is:

(current jiffies) > (frame Rx jiffies + NL80211_MESHCONF_PLINK_TIMEOUT * 250)

On 32bit system, the right side would overflow and be a very small
value if NL80211_MESHCONF_PLINK_TIMEOUT is sufficiently large,
causing unexpectedly early disconnections.

Instead allow disabling the inactivity timer to avoid this situation,
by passing the (previously invalid and useless) value 0.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
[reword/rewrap commit log]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Masashi Honma 2015-02-24 22:42:16 +09:00 committed by Johannes Berg
parent cd37a90b2a
commit 31f909a2c0
3 changed files with 5 additions and 3 deletions
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3
include/uapi/linux/nl80211.h
View File

@ -3092,7 +3092,8 @@ enum nl80211_mesh_power_mode {
*
* @NL80211_MESHCONF_PLINK_TIMEOUT: If no tx activity is seen from a STA we've
* established peering with for longer than this time (in seconds), then
* remove it from the STA's list of peers. Default is 30 minutes.
* remove it from the STA's list of peers. You may set this to 0 to disable
* the removal of the STA. Default is 30 minutes.
*
* @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
*/

3
net/mac80211/mesh.c
View File

@ -574,7 +574,8 @@ static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u32 changed;
ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
if (ifmsh->mshcfg.plink_timeout > 0)
ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
mesh_path_expire(sdata);
changed = mesh_accept_plinks_update(sdata);

2
net/wireless/nl80211.c
View File

@ -5265,7 +5265,7 @@ do { \
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshAwakeWindowDuration,
0, 65535, mask,
NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16);
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, 1, 0xffffffff,
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, 0, 0xffffffff,
mask, NL80211_MESHCONF_PLINK_TIMEOUT,
nla_get_u32);
if (mask_out)